CN219937320U - Battery and battery pack - Google Patents

Abstract

The utility model discloses a battery and a battery pack, which belong to the technical field of batteries, and comprise a shell, wherein the shell is provided with a containing cavity; the top cover comprises a pole, the top cover has a thickness direction, and is connected with the shell and covers the accommodating cavity; the electrode assembly is arranged in the accommodating cavity and comprises a winding core body and a tab, the tab comprises a furling part and an extending part, the furling part is connected with the winding core body, and the extending part is connected with one side of the furling part away from the winding core body; and the connecting piece is positioned between the top cover and the electrode assembly, is connected with the pole and is provided with a connecting part extending along the thickness direction, and the extending part extends along the thickness direction and is connected with the connecting part. According to the utility model, the lugs of the electrode assemblies are not required to be sequentially stacked on the pole posts and then the core is relatively rotated, so that the problems of breaking the lugs and interpolating the lugs caused by twisting the lugs in the process of assembling the battery are avoided, and the battery assembling efficiency is improved.

Description

Battery and battery pack

Technical Field

The utility model belongs to the technical field of batteries, and particularly relates to a battery and a battery pack.

Background

At present, in the manufacturing process of the multi-lug battery, the lugs and the poles of the winding core are respectively welded with the connecting piece, and then the top cover and the shell are sealed and welded after the winding core is closed and the winding core is put into the shell. However, in the core winding and closing process, the tab needs to be twisted to make the winding cores at two sides abut against, the root part of the tab is easily torn off, and the tab is easily deformed at different positions due to twisting, so that part of the tab is interpolated after core closing, and a short circuit is caused.

Disclosure of Invention

The utility model aims to: the embodiment of the utility model provides a battery, which aims to solve the problem of tab interpolation caused by breaking tabs due to core combination in the manufacturing process of a multi-tab battery; another object of the present utility model is to provide a battery pack using the above battery.

The technical scheme is as follows: the battery according to the embodiment of the utility model comprises:

a housing having a receiving cavity;

the top cover comprises a pole, the top cover has a thickness direction, and the top cover is connected with the shell and covers the accommodating cavity;

the electrode assembly is arranged in the accommodating cavity and comprises a winding core body and a tab, the tab comprises a furling part and an extending part, the furling part is connected with the winding core body, and the extending part is connected with one side of the furling part far away from the winding core body;

and a connecting member between the top cap and the electrode assembly, the connecting member being connected with the electrode post, the connecting member having a connecting portion extending in the thickness direction, the extending portion extending in the thickness direction and being connected with the connecting portion.

In some embodiments, the connection further comprises a base portion, the base portion and the connection portion being connected to each other, the base portion being connected to the pole, the top cover having a width direction, the width direction being perpendicular to the thickness direction;

the connecting part is provided with a first connecting surface and a second connecting surface which are oppositely arranged in the width direction, and the extending part is connected with the first connecting surface or the second connecting surface.

In some embodiments, the electrode assembly is provided in plurality, and the plurality of electrode assemblies are sequentially disposed in the width direction;

at least part of the extension part is connected with the first connecting surface; and/or the number of the groups of groups,

at least part of the extension part is connected with the second connecting surface.

In some embodiments, the base has a first end and a second end disposed opposite each other in the width direction, the connecting portion connects a side of the base facing away from the pole, and the connecting portion is located between the first end and the second end;

the number of the extending parts connected with the first connecting surface is the same as the number of the extending parts connected with the second connecting surface.

In some embodiments, the base has a first end and a second end disposed opposite to each other in the width direction, the connection portion is disposed on a side of the base facing away from the pole, the connection portion connects the first end, and the extension portion connects with the second connection surface;

or the connecting part is connected with the second end, and the extending part is connected with the first connecting surface.

In some embodiments, the base has a first end and a second end disposed opposite to each other in the width direction, the connecting portions are disposed on a side of the base facing away from the pole, one of the connecting portions is connected to the first end, the other connecting portion is connected to the second end, and the extending portion is located between one of the connecting portions and the other connecting portion.

In some embodiments, the extension at least partially conforms to the first connection face; and/or the number of the groups of groups,

the extension portion at least partially conforms to the second connection surface.

In some embodiments, the winding core body includes a protrusion extending toward the top cover in the thickness direction, and a face of the protrusion extending toward the top cover conforms to the top cover, the protrusion being located between adjacent tabs.

In some embodiments, the top cover includes an insulating member, the protruding portion is connected with the insulating member, a supporting portion is disposed between the insulating member and the winding core body, the supporting portion has two ends that are disposed opposite to each other in the thickness direction, one end of the supporting portion is connected with the insulating member, and the other end of the supporting portion is connected with the winding core body.

The battery pack provided by the embodiment of the utility model comprises the battery.

The beneficial effects are that: the battery of the embodiment of the utility model comprises a shell, a top cover, an electrode assembly and a connecting piece, wherein the shell is provided with a containing cavity, the top cover comprises a pole, the top cover is provided with a thickness direction, and the top cover is connected with the shell and covers the containing cavity; the electrode assembly is arranged in the accommodating cavity and comprises a winding core body and a tab, the tab comprises a furling part and an extending part, the furling part is connected with the winding core body, and the extending part is connected with one side of the furling part away from the winding core body; the connecting piece is located between top cap and electrode assembly, and the connecting piece is connected with the utmost point post, and extension extends and is connected with the connecting piece along thickness direction. This connecting piece of battery is connected between utmost point post and electrode subassembly, and extension extends to connecting piece department along thickness direction, has guaranteed that the extension has the side can be directly connected with the connecting piece, when arranging a plurality of electrode subassemblies in the casing, each book core body can arrange in proper order and guarantee that each utmost point ear all is connected with the connecting piece, compares in traditional battery structure, need not to overturn at the core process of closing, has avoided the torsion utmost point ear to cause the problem of tearing utmost point ear, part utmost point ear interpolation of tearing in the assembled battery process, improves the efficiency of battery assembly.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is an exploded view of a housing and top cover of an embodiment of the present utility model;

FIG. 2 is an exploded view of an electrode assembly and a top cap according to an embodiment of the present utility model;

FIG. 3 is a schematic view of the structure of the top cover according to the embodiment of the present utility model;

fig. 4 is a schematic structural view of an electrode assembly according to an embodiment of the present utility model;

FIG. 5 is a schematic view of another embodiment of the present utility model with a connection portion and base portion arrangement;

FIG. 6 is a schematic view of another embodiment of the present utility model with a connection portion and base portion arrangement;

reference numerals: 1. a battery; 10. a housing; 100. a receiving chamber; 11. a top cover; 110. a top cover sheet; 111. an insulating member; 112. convex hulls; 113. a support part; 12. a pole; 13. an electrode assembly; 130. a winding core body; 131. a tab; 132. a gathering part; 133. an extension; 134. a convex portion; 2. a connecting piece; 20. a first connection surface; 21. a second connection surface; 22. a base; 220. a first end; 221. a second end; 23. a connection part; x, thickness direction; y, width direction.

Detailed Description

The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. It will be apparent that the described embodiments are only some, but not all, embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to fall within the scope of the utility model.

In the description of the present utility model, it should be understood that, in the description of the present utility model, it should be understood that the terms "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more features. In the description of the present utility model, the meaning of "plurality" means two or more, and at least one means one, two or more, unless explicitly defined otherwise.

The applicant notes that in the current process of manufacturing the multi-tab cell, when the winding core is welded to the top cover, the top cover and the winding cores on two sides of the top cover are generally put into a welding fixture together for welding. After welding, the winding cores on two sides of the top cover are required to be combined, the combined winding cores are bound through gummed paper, and then Mylar films are wrapped to be inserted into the battery case, and then the top cover and the battery case are welded. In the process of core closing, the tab close to the outer side of the battery shell is easily torn, and after core closing, the tab at the inner side of the winding core is redundant, and the redundant part is easily inserted into the winding core to cause short circuit.

Meanwhile, in order to improve the capacity of the battery core, the size of the existing winding core is larger and larger, and the thickness of the winding core is also larger and larger. Correspondingly, the number of layers of the tab is also increased and increased. Therefore, when the tab is welded on the top cover to close the core, the risk that the tab on the outer side of the winding core is pulled and broken is also increased; the risk of redundancy, interpolation of the inner tabs is also increasing.

In view of the above, embodiments of the present utility model provide a battery that can solve at least one of the above-mentioned drawbacks.

Referring to fig. 1 to 4, the battery includes a case 10, a top cap 11, an electrode assembly 13, and two connection members 2. The housing 10 has a housing cavity 100, the top cover 11 includes two poles 12, the top cover 11 has a thickness direction X and a width direction Y perpendicular to each other, and the top cover 11 is connected with the housing 10 and covers the housing cavity 100; the electrode assembly 13 is arranged in the accommodating cavity 100, the electrode assembly 13 comprises a winding core body 130 and positive and negative electrode lugs 131, the electrode lugs 131 comprise a furling part 132 and an extending part 133, the furling part 132 is connected with the winding core body 130, namely the furling part 132 is actually connected with the winding core body 130, and the extending part 133 is connected with one side of the furling part 132 far away from the winding core body 130; the positive and negative electrode connecting pieces 2 are in one-to-one correspondence with the positive and negative electrode posts 12, and the positive and negative electrode lugs 131 are in one-to-one correspondence with the positive and negative electrode connecting pieces 2, the connecting pieces 2 are located between the top cover 11 and the electrode assemblies 13, the connecting pieces 2 are connected with the corresponding electrode posts 12, and the extending portions 133 extend in the thickness direction X and are connected with the corresponding connecting pieces 2.

Extension 133 extends to connecting piece 2 department along thickness direction X, it can be directly connected with connecting piece 2 to have guaranteed that extension 133 has the side, when arranging a plurality of electrode assemblies 13 in casing 10, each book core body 130 can be arranged in proper order along width direction Y and guarantee that extension 133 of each utmost point ear 131 all can be connected with corresponding connecting piece 2, compare in traditional battery structure, need not to fold in proper order the utmost point ear 131 of a plurality of electrode assemblies 13 and establish on utmost point post 12 then the relative rotation closes the core, the problem that the utmost point ear 131 was broken in the torsion of utmost point ear 131 caused in the assembly of battery 1, the problem of some utmost point ears 131 inserted book core body 130 has been avoided, the efficiency of battery 1 assembly is improved.

Specifically, referring to fig. 2 and 3, two electrode assemblies 13 are taken as an example in the embodiment of the present utility model, and in other embodiments, the number of electrode assemblies 13 may be flexibly increased or decreased according to the capacity requirement of the battery 1, the size of the casing 10, etc., that is, one or more electrode assemblies 13 may be used.

The connecting piece 2 includes a base 22 and a connecting portion 23, in this embodiment, the base 22 and the connecting portion 23 are both made of conductive metal, one side of the base 22 is attached to the pole 12, the connecting portion 23 extends toward the extending portion 133 along the thickness direction X, and one end of the connecting portion 23 in the thickness direction X is connected to the base 22, and the connecting manner of the connecting portion 23 and the base 22 may be welding, integral molding, or the like. In the process of assembling the battery 1, the base 22 can be welded on the pole 12 in advance, so that the need of welding the base 22 and the pole 12 before and after the welding connection part 23 and the extension part 133 is avoided, and the assembly efficiency of the battery 1 is improved.

In some embodiments, the pole 12 and the connecting piece 2 can be manufactured by integral molding, which eliminates the step of welding the pole 12 by the connecting piece 2, is beneficial to improving the assembly efficiency of the battery 1, reduces the contact resistance between the connecting piece 2 and the pole 12, and avoids the problem of poor welding between the connecting piece 2 and the pole 12 in the assembly process of the battery 1.

Referring to fig. 2 and 3, the connecting portion 23 has a first connecting surface 20 and a second connecting surface 21 disposed opposite to each other in the width direction Y, the base 22 has a first end 220 and a second end 221 disposed opposite to each other in the width direction Y, and the connecting portion 23 is located between the first end 220 and the second end 221, and the connecting member 2 of the present embodiment is T-shaped overall as shown in fig. 3. In this embodiment, the positive and negative electrode tabs 131 of one electrode assembly 13 are in one-to-one correspondence with the first connection surfaces 20 of two connection portions 23, and the positive and negative electrode tabs 131 of the other electrode assembly 13 are in one-to-one correspondence with the second connection surfaces 21 of two connection portions 23. I.e. the number of extensions 133 connecting the first connection face 20 is the same as the number of extensions 133 connecting the second connection face 21.

In some embodiments, referring to fig. 5, two connection parts 23 are connected to the first ends 220 of the corresponding base parts 22, the first connection surfaces 20 are flush with the end surfaces of the corresponding first ends 220, when the tabs 131 of the two electrode assemblies 13 need to be connected to the connection member 2, the two electrode assemblies 13 need to be disposed opposite to the second connection surfaces 21 in sequence along the width direction Y, wherein the extension 133 of one electrode assembly 13 is directly connected to the opposite second connection surface 21, and the extension 133 of the other electrode assembly 13 needs to be connected to the extension 133 of the adjacent electrode assembly 13 to indirectly connect to the second connection surface 21. The connection manner of the extension portion 133 and the first connection surface 20 and the second connection surface 21 is welding, and may be ultrasonic welding, laser welding, or the like.

Similarly, in some embodiments, two connecting portions 23 may be connected to the second ends 221 of the corresponding base 22, and the second connecting surfaces 21 are flush with the end surfaces of the corresponding second ends 221, where the two electrode assemblies 13 need to be disposed opposite to the first connecting surfaces 20 and in sequence along the width direction Y, and the extending portion 133 of one electrode assembly 13 is directly connected to the opposite first connecting surface 20, and the extending portion 133 of the other electrode assembly 13 needs to be connected to the extending portion 133 of the adjacent electrode assembly 13 to indirectly connect to the first connecting surface 20.

In some embodiments, referring to fig. 6, one of the connection portions 23 is connected with the first end 220 of the corresponding base 22, the first connection face 20 of one of the connection portions 23 is flush with the end face of the first end 220 of the corresponding base 22, the other connection portion 23 is connected with the second end 221 of the corresponding base 22, and the second connection face 21 of the other connection portion 23 is flush with the end face of the second end 221 of the corresponding base 22. That is, the two connection parts 23 are spaced apart in the width direction Y, and at this time, the two electrode assemblies 13 need to be disposed between the opposite of the two connection parts 23, wherein one extension part 133 of one electrode assembly 13 is directly connected to the second connection surface 21 of the connection part 23, and one extension part 133 of the other electrode assembly 13 is connected to the adjacent extension part 133 to realize indirect connection to the opposite second connection surface 21; likewise, the other extension 133 of one electrode assembly 13 may be connected only indirectly to the first connection surface 20 of the opposite connection portion 23, and the other extension 133 of the other electrode assembly 13 may be connected directly to the first connection surface 20 of the opposite connection portion 23.

It should be noted that, in some embodiments, the positional relationship between the first connection surface 20 and the second connection surface 21 and the end surfaces of the corresponding first end 220 and the second end 221 may not be flush without affecting the normal welding connection.

In addition, in some embodiments, referring to fig. 1 and 2, the extension 133 directly connected to the first connection surface 20 is relatively attached to the first connection surface 20, and the extension 133 directly connected to the second connection surface 21 is relatively attached to the second connection surface 21. It can be appreciated that the above-mentioned bonding includes partial bonding and complete bonding, wherein the complete bonding is that the first connecting surface 20 is completely bonded to the surface of the extension portion 133, and the partial bonding may be that the extension portion 133 is dislocated and bonded to the first connecting surface 20, and the extension portion 133 in this embodiment is completely bonded to the corresponding first connecting surface 20 and second connecting surface 21, so as to be beneficial to reducing the connection resistance between the extension portion 133 and the connecting portion 23 and improving the conductive effect.

On this basis, referring to fig. 3, in this embodiment, the first connection surface 20 and the second connection surface 21 of the same connection portion 23 are attached to one extension portion 133, that is, the connection portion 23 is located between the two opposite extension portions 133, and compared with the connection of the first connection surface 20 or the second connection surface 21 of the connection portion 23 alone, the contact area between the connection portion 23 and the tab 13 is further increased, so that the connection resistance is reduced, and the service performance of the battery is improved.

Referring to fig. 1, 2 and 4, the winding core body 130 in this embodiment includes a protrusion 134, and the protrusion 134 extends toward the top cover 11 along the thickness direction X, so that the winding core body 130 has a convex shape as a whole. The surface of the protrusion 134 extending toward the top cover 11 is bonded to the top cover 11, and the protrusion 134 is located between the adjacent tabs 131. It should be noted that, the convex portion 134 of the winding core body 130 needs to be cut into a convex shape in advance at the coating portion of the pole piece, and the convex portion is stacked into the integral winding core body 130 during the lamination process, which is not described herein. It can be appreciated that the convex portion 134 is attached to the top cover 11 to form a supporting structure, so that the problem that the tab 131 is torn and the tab 131 is inserted into the winding core body 130 due to the movement of the winding core body 130 in the housing 10 to the pole 12 when the battery 1 using the top cover 11 is placed upside down or vibration test is avoided. Meanwhile, compared with the conventional winding core structure, the convex part 134 makes full use of the space between the two pole ears 131, and improves the energy density of the battery 1.

In some embodiments, referring to fig. 2, top cover 11 includes an insulator 111, the insulator 111 has a convex hull 112 opposite the convex hull 112, the convex hull 112 extends toward the convex hull 134, and the convex hull 134 conforms to the convex hull 112 toward the end of the insulator 111. The insulating member 111 is made of plastic material, two supporting portions 113 are arranged between the insulating member 111 and the winding core body 130, and the two supporting portions 113 are in one-to-one correspondence with two ends of the insulating member 111 in the length direction. The support portion 113 has opposite ends in the thickness direction X, one end of the support portion 113 is connected to the insulator 111, and the other end of the support portion 113 is connected to the winding core body 130. It can be understood that the two supporting portions 113 are supported on the winding core body 130, so as to share the pressure borne by the protruding portions 134, and facilitate the dispersion of the impact borne by the protruding portions 134 in the state of vibration of the battery 1, etc., and improve the protection of the winding core body 130.

Correspondingly, the embodiment of the utility model also provides a battery pack, which comprises the battery 1. It will be appreciated that the battery pack may have all the technical features and corresponding advantageous effects of the battery 1 described above, and will not be described in detail herein.

The foregoing has been provided by embodiments of the present utility model in detail, and has been presented by way of example only to facilitate the understanding of the principles and embodiments of the present utility model and its core ideas; those of ordinary skill in the art will appreciate that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the utility model.

Claims (10)

1. A battery (1), characterized by comprising:

a housing (10), the housing (10) having a receiving cavity (100);

a top cover (11), the top cover (11) comprising a pole (12), the top cover (11) having a thickness direction (X), the top cover (11) being connected with the housing (10) and covering the receiving cavity (100);

the electrode assembly (13), the electrode assembly (13) is arranged in the accommodating cavity (100), the electrode assembly (13) comprises a winding core body (130) and a tab (131), the tab (131) comprises a furling part (132) and an extending part (133), the furling part (132) is connected with the winding core body (130), and the extending part (133) is arranged on one side of the furling part (132) away from the winding core body (130);

connecting piece (2), connecting piece (2) are located top cap (11) with electrode subassembly (13) between, connecting piece (2) with utmost point post (12) are connected, connecting piece (2) have along connecting portion (23) that thickness direction (X) extends, extension (133) are followed thickness direction (X) extends and with connecting portion (23) are connected.

2. The battery (1) according to claim 1, wherein the connecting member (2) further comprises a base portion (22), the base portion (22) and the connecting portion (23) being connected to each other, the base portion (22) connecting the pole (12), the top cover (11) having a width direction (Y), the width direction (Y) being perpendicular to the thickness direction (X);

the connecting portion (23) has a first connecting surface (20) and a second connecting surface (21) which are disposed opposite to each other in the width direction (Y), and the extending portion (133) connects the first connecting surface (20) or the second connecting surface (21).

3. The battery (1) according to claim 2, wherein a plurality of the electrode assemblies (13) are provided, the plurality of the electrode assemblies (13) being disposed in order in the width direction (Y);

at least part of the extension (133) is connected to the first connection face (20); and/or the number of the groups of groups,

at least part of the extension (133) is connected to the second connection surface (21).

4. A battery (1) according to claim 3, wherein the base (22) has a first end (220) and a second end (221) disposed opposite each other in the width direction (Y), the connecting portion (23) connects a side of the base (22) facing away from the pole (12), and the connecting portion (23) is located between the first end (220) and the second end (221);

the number of the extension parts (133) connecting the first connection surface (20) is the same as the number of the extension parts (133) connecting the second connection surface (21).

5. A battery (1) according to claim 3, wherein the base (22) has a first end (220) and a second end (221) disposed opposite to each other in the width direction (Y), the connection portion (23) being disposed on a side of the base (22) facing away from the pole (12), the connection portion (23) connecting the first end (220), the extension portion (133) being connected with the second connection surface (21);

or, the connecting portion (23) is connected to the second end (221), and the extending portion (133) is connected to the first connecting surface (20).

6. A battery (1) according to claim 3, wherein the base (22) has a first end (220) and a second end (221) arranged opposite to each other in the width direction (Y), the connection portions (23) being arranged on a side of the base (22) facing away from the pole (12), one of the connection portions (23) being connected to the first end (220), the other connection portion (23) being connected to the second end (221), the extension portion (133) being located between one of the connection portions (23) and the other connection portion (23).

7. A battery (1) according to claim 3, wherein the extension (133) at least partially conforms to the first connection face (20);

and/or the extension (133) at least partially engages the second connection surface (21).

8. The battery (1) according to any one of claims 1 to 7, wherein the winding core body (130) includes a convex portion (134), the convex portion (134) extends toward the top cover (11) in the thickness direction (X), and a face of the convex portion (134) extending toward the top cover (11) conforms to the top cover (11), the convex portion (134) being located between adjacent tabs (131).

9. The battery (1) according to claim 8, wherein the top cover (11) includes an insulating member (111), the protruding portion (134) is connected with the insulating member (111), a supporting portion (113) is provided between the insulating member (111) and the winding core body (130), the supporting portion (113) has opposite ends in the thickness direction (X), one end of the supporting portion (113) is connected with the insulating member (111), and the other end of the supporting portion (113) is connected with the winding core body (130).

10. Battery pack, characterized by comprising a battery (1) according to any of claims 1 to 9.