阅读说明：本技术 电芯、电池及用电设备 (Battery cell, battery and electric equipment ) 是由 范会平 余仕禧 王会勤 于 2020-12-16 设计创作，主要内容包括：本申请公开一种电芯、电池及用电设备。本申请电芯中的胶层不仅完全覆盖住极耳与极耳引线的焊接区域,而且胶层的两端分别设置于电极组件的相对两个表面,胶层与电极组件相固定的面积较大,附着力强,不易脱落,有利于避免焊接区域的毛刺与电池的壳体接触,从而降低腐蚀漏液的风险,并有利于确保电芯顶封效率。(The application discloses electric core, battery and consumer. The glue film in this application electricity core not only covers the welding area of utmost point ear and utmost point ear lead wire completely, and the both ends of glue film set up respectively in two relative surfaces of electrode subassembly moreover, and the glue film is great with the area that electrode subassembly was fixed mutually, and adhesive force is strong, is difficult for droing, is favorable to avoiding welding area's burr and the casing contact of battery to reduce the risk of corroding the weeping, and be favorable to ensureing electric core top seal efficiency.)

1. A cell, comprising:

an electrode assembly including a first surface, a side surface, and a second surface connected in this order, the first surface being disposed opposite to the second surface in a thickness direction of the electrode assembly;

the tab is electrically connected with the electrode assembly and penetrates out of the side face;

the tab lead is connected with the tab in a welding manner and forms a welding area;

the welding structure is characterized by further comprising a glue layer, wherein one end of the glue layer is arranged on the first surface, the other end of the glue layer is arranged on the second surface, and the glue layer completely covers the welding area.

2. The cell of claim 1, wherein the tab comprises a first tab and a second tab, the tab lead comprises a first tab lead and a second tab lead, the first tab lead is connected to the first tab by welding and forms a first welding region, the second tab lead is connected to the second tab by welding and forms a second welding region, and the glue layer comprises a first glue layer for covering the first welding region and a second glue layer for covering the second welding region.

3. The battery cell of claim 2, wherein the first adhesive layer and the second adhesive layer are respectively provided with a notch for the first tab lead and the second tab lead to pass through.

4. The battery cell of claim 3, wherein the first adhesive layer or the second adhesive layer comprises a first portion, a second portion, a third portion and a fourth portion, which are sequentially connected to each other, the first portion is disposed on the first surface, the second portion and the third portion are both disposed opposite to the side surface, the fourth portion is disposed on the second surface, the second portion is configured to cover the first welding region, and the third portion is provided with the notch.

5. The battery cell of claim 3, wherein the first tab lead has a width W0, the notch has a width W1, 2mm ≦ W1-W0 ≦ 6 mm.

6. The cell of claim 3, wherein a length of the second portion is greater than a length of the first weld region, and a width of the second portion, in a thickness direction of the electrode assembly, is greater than a height of the first weld region.

7. The cell of claim 3, wherein the fourth portion is provided with the notch.

8. The battery cell of claim 2, wherein the first glue layer and the second glue layer are integrally connected; or the first adhesive layer and the second adhesive layer are not overlapped.

9. A battery comprising a housing and the cell of any of claims 1-8, the cell disposed within the housing.

10. An electric device comprising the battery of claim 9.

Technical Field

The application relates to the technical field of tab welding protection, in particular to an electric core, a battery and electric equipment.

Background

The battery generally includes electrode subassembly, utmost point ear (including positive negative pole ear), utmost point ear lead wire, and casing, some of electrode subassembly and utmost point ear are located the casing, the casing intussuseption is filled with electrolyte, utmost point ear and utmost point ear lead wire welding, utmost point ear can be buckled when the welding, the department of buckling can produce the produced resilience stress of natural shape of resume, the burr that drives welding area easily contacts and punctures the inside fusion layer of casing (like polypropylene (PP) layer), thereby lead to the fusion layer of electrolyte corruption casing, and to the battery that adopts laminate polymer core, the burr is in case impaled soft casing, not only can lead to electrolyte to reveal, still can lead to outside air, inside steam etc. gets into electric core, corrode electric core, influence battery performance and safety.

Although prior art can set up the glue film between welding area and casing, avoid the burr contact and puncture the aluminium membrane of casing through the glue film, but the adhesion design of current glue film is not good, drops under the effect of utmost point ear resilience stress easily, not only can't reduce the corruption weeping risk, when electric core top seal process, need operating personnel to paste the glue film again moreover, influence efficiency, if operating personnel does not keep in mind, the insulating cement of bonding glue film can get into electric core top seal, leads to corroding the weeping.

Therefore, how to avoid corrosion and leakage caused by the situation that burrs generated by welding the tabs pierce the shell is still one of the important problems to be solved urgently in the industry at present. It should be appreciated that the foregoing description is provided for general background information and does not necessarily constitute prior art.

Disclosure of Invention

In view of this, the application provides a battery cell, a battery and an electric device, so as to solve the problem that burrs welded to tabs puncture a shell to cause corrosion and leakage.

A first aspect of the embodiments of the present application provides an electrical core, which includes an electrode assembly, a tab lead and a glue layer. The electrode assembly includes a first surface, a side surface, and a second surface connected in this order, and the first surface is disposed opposite to the second surface in a thickness direction of the electrode assembly. The tab is electrically connected with the electrode assembly and penetrates out of the side surface of the electrode assembly. The tab lead is connected with the tab through welding, and a welding area is formed. One end of the adhesive layer is arranged on the first surface of the electrode assembly, the other end of the adhesive layer is arranged on the second surface of the electrode assembly, and the adhesive layer completely covers the welding area.

In some embodiments, the tab comprises a first tab and a second tab, the tab leads comprise a first tab lead and a second tab lead, the first tab lead is connected with the first tab by welding and forms a first welding area, the second tab lead is connected with the second tab by welding and forms a second welding area, and the glue layer comprises a first glue layer for covering the first welding area and a second glue layer for covering the second welding area.

In some embodiments, the first adhesive layer and the second adhesive layer are respectively provided with a notch for the first tab lead and the second tab lead to penetrate out.

In some embodiments, the first adhesive layer or the second adhesive layer respectively includes a first portion, a second portion, a third portion and a fourth portion, which are sequentially connected, the first portion is disposed on the first surface, the second portion and the third portion are both disposed opposite to the side surface, the fourth portion is disposed on the second surface, the second portion is used for covering the first welding area, and the third portion is provided with a notch.

In some embodiments, the width of the first tab lead is W0, the width of the notch is W1, 2mm ≦ W1-W0 ≦ 6 mm.

In some embodiments, the length of the second portion is greater than the length of the first welding region, and the width of the second portion is greater than the height of the first welding region in the thickness direction of the electrode assembly.

In some embodiments, the fourth portion is provided with a notch.

In some embodiments, the first adhesive layer and the second adhesive layer are integrally connected; or the first adhesive layer and the second adhesive layer are not overlapped.

A second aspect of the embodiments of the present application provides a battery, including a casing and the electric core described in any one of the above, where the electric core is disposed in the casing.

A third aspect of the embodiments of the present application provides an electric device including the above battery.

In electric core, battery and consumer of this application embodiment, the glue film in the electric core not only covers utmost point ear and the welding area of utmost point ear lead wire completely, and the both ends of glue film set up respectively in two relative surfaces of electrode subassembly moreover, the glue film is great with the area that electrode subassembly was fixed mutually, strong adhesion, be difficult for droing, offset the resilience stress of utmost point ear department of buckling simultaneously, be favorable to avoiding welding area's burr contact and puncture battery case's fusion layer, reduce the risk of corroding the weeping, ensure electric core, battery and consumer's security.

Drawings

Fig. 1 is a schematic structural diagram of a battery according to an embodiment of the present application;

FIG. 2 is a schematic structural diagram of a glue layer according to a first embodiment of the present application;

fig. 3, fig. 4 and fig. 5 are schematic structural diagrams of a battery cell adopting the glue layer shown in fig. 2 at different viewing angles;

FIG. 6 is a schematic view of a structure of a glue layer according to a second embodiment of the present application;

fig. 7, fig. 8 and fig. 9 are schematic structural diagrams of a battery cell adopting the glue layer shown in fig. 6 at different viewing angles;

FIG. 10 is a schematic view of the structure of a glue layer according to a third embodiment of the present application;

fig. 11, 12 and 13 are schematic structural diagrams of a cell adopting the glue layer shown in fig. 10 at different viewing angles;

FIG. 14 is a schematic view of a structure of a glue layer according to a fourth embodiment of the present application;

fig. 15, 16 and 17 are schematic structural diagrams of a battery cell adopting the glue layer shown in fig. 14 at different viewing angles.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more clear, the technical solutions of the present application will be clearly and completely described below with reference to the specific embodiments and the accompanying drawings. It is to be understood that the described embodiments are merely illustrative of some, and not restrictive, of the broad application. Based on the description of the present application, the following respective embodiments and technical features thereof may be combined with each other without conflict.

It should be understood that in the description of the embodiments of the present application, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of describing technical solutions and simplifying the description of the respective embodiments of the present application, and do not indicate or imply that a device or an element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present application.

In considering current electric core structure, the utmost point ear is buckled when welding with utmost point ear lead wire and is produced the resilience stress, drives the burr contact of welding area easily and punctures casing (the fusion layer of inside), produces the risk of corroding the weeping. The glue film in this application embodiment electric core not only covers the welding zone completely, and its both ends still set up respectively in two relative surfaces of electrode subassembly, through the area that increases glue film and electrode subassembly looks fixed, strengthen the bonding stability of glue film, reduce the probability of welding zone's burr and casing contact.

First embodiment

Referring to fig. 1 to 5, a cell is disposed in a casing 15 of a battery 10, and the cell includes an electrode assembly 11, a tab 12, a tab lead 13, and a glue layer 14.

It should be understood that the above-mentioned structural elements are merely exemplary, and the battery 10 may further include other elements, which are not described herein in detail with reference to the prior art.

The electrode assembly 11 includes a first surface, a side surface, and a second surface connected in this order, the first surface being disposed opposite to the second surface in a thickness direction of the electrode assembly 11.

In one implementation, such as the orientation shown in fig. 1, the thickness direction of the electrode assembly 11 is the second direction y, the bottom surface of the electrode assembly 11 is the first surface, the top surface of the electrode assembly 11 is the second surface, and the right side surface of the electrode assembly 11 is the side surface connecting the first surface and the second surface. It should be understood that the orientation of the battery 10 varies, and the orientation of the first, side, and second surfaces changes accordingly.

The electrode assembly 11 may be formed by winding or stacking a plurality of pole pieces, which are layered and protrude from the sides of the electrode assembly 11, and the ends of which are collected to form the tabs 12. Here, the tab 12 is electrically connected to the electrode assembly 11. In the implementation shown in fig. 1, the tab 12 may be bent in a U-shape at the right side surface of the electrode assembly 11, with a clamping groove 12 a.

One end of the tab lead 13 is connected to the tab 12 by welding and forms a welding area 16, and the other end can protrude from the case 15 of the battery 10 and form an electrode of the battery 10.

In the implementation shown in fig. 1, the tab lead 13 may have an L shape, and includes a main body portion extending in the first direction x and an extension portion extending from one end of the main body portion into the clamping groove 12 a. In the first direction x, the extension portion of the tab lead 13 partially overlaps the tab 12, and herein, the tab lead 13 is welded to the tab 12 in the overlapping region, and the orthographic projection of the welding region 16 of the tab lead 13 and the tab 12 may fall within the overlapping region in the first direction x, thereby ensuring the welding firmness of the tab lead 13 and the tab 12 and the stability of the electrical connection of the tab lead 13 and the tab 12.

One end of the glue layer 14 is disposed on (e.g., adhered to) the first surface of the electrode assembly 11, and the other end of the glue layer 14 is disposed on (e.g., adhered to) the second surface of the electrode assembly 11, and the glue layer 14 completely covers the welding region 16 of the tab lead 13 and the tab 12.

The tabs 12 include a first tab and a second tab, positive and negative, respectively, in accordance with the design of the battery 10, which typically has positive and negative polarities. Suitably, the tab leads 13 include first and second tab leads, positive and negative tab leads, respectively. The first lug lead is welded with the first lug to form a first welding area, and the second lug lead is welded with the second lug to form a second welding area. The glue layer 14 comprises a first glue layer for covering the first soldering area and a second glue layer for covering the second soldering area.

For convenience of description, hereinafter, the tab 12, the first tab and the second tab are identified by the same reference numerals, the tab lead 13, the first tab lead and the second tab lead are identified by the same reference numerals, and the welding area 16, the first welding area and the second welding area are identified by the same reference numerals.

The first adhesive layer 14 and the second adhesive layer 14 may have the same structure and shape, for example, both have a sheet structure with a notch 14e, and the whole structure has a shape like a Chinese character 'ao'. The notch 14e of the first adhesive layer 14 is used for the first tab lead 13 to pass through, and the notch 14e of the second adhesive layer 14 is used for the second tab lead 13 to pass through.

The first layer of glue 14 comprises a first portion 14a, a second portion 14b, a third portion 14c and a fourth portion 14d connected in sequence. The third portion 14c and the fourth portion 14d are each provided with a notch, the notches of which are in communication and form a notch 14e of the first layer of glue 14. In a state where the first paste layer 14 is bonded to the electrode assembly 11, the first tab lead 13 is protruded from the notch 14e of the first paste layer 14, the first portion 14a is bonded to the bottom surface of the electrode assembly 11, the fourth portion 14d is bonded to the top surface of the electrode assembly 11, the second portion 14b and the third portion 14c are disposed opposite to the side surface of the electrode assembly 11, and the second portion 14b and the third portion 14c can be regarded as covering the side surface of the electrode assembly 11, and the second portion 14b is used to cover the first welding region 16.

The second layer of glue 14 comprises a first portion 14a, a second portion 14b, a third portion 14c and a fourth portion 14d connected in sequence. The third portion 14c and the fourth portion 14d are each provided with a notch, and the notches of the two portions are communicated and form a notch 14e of the second glue layer 14. In a state where the second adhesive layer 14 is bonded to the electrode assembly 11, the second tab lead 13 is extended through the notch 14e of the second adhesive layer 14, the first portion 14a is bonded to the bottom surface of the electrode assembly 11, the fourth portion 14d is bonded to the top surface of the electrode assembly 11, the second portion 14b and the third portion 14c are disposed opposite to the side surface of the electrode assembly 11, and the second portion 14b and the third portion 14c can be regarded as covering the side surface of the electrode assembly 11, and the second portion 14b is used to cover the second bonding region 16.

As shown in fig. 3 and 5, between the first tab lead 13 and the second tab lead 13, the first adhesive layer 14 is spaced apart from the second adhesive layer 14, i.e., there is no overlap between the two adhesive layers 14.

The internal components of the battery 10, such as the electrode assembly 11, the tab 12, the tab lead 13, and the adhesive layer 14, are embedded in the cavity defined by the case 15, and the components in the battery 10 are protected by the case 15, so that the safety of the battery 10 can be ensured.

The cavity of the case 15 is filled with an electrolyte. A part of the main body portions of the first tab lead 13 and the second tab lead 13 are exposed, and the outer surface of the exposed portion may be partially encapsulated and wrapped with an encapsulation layer 17 for preventing external water and oxygen from entering the inside of the battery 10 from the joints between the first tab lead 13 and the casing 15 and preventing internal electrolyte from leaking outwards from the joints between the first tab lead 13 and the casing 15 and the second tab lead 13.

The encapsulation layer 17 may be made of a material having good sealing properties against water, oxygen, etc., and in one implementation, the material of the encapsulation layer 17 may be glue (e.g., electrode glue) or resin.

As can be seen from the above, the glue layer 14 not only covers the welding area 16 between the tab 12 and the tab lead 13, but also the opposite ends of the glue layer 14 are respectively disposed on the two opposite surfaces of the electrode assembly 11, the glue layer 14 has a larger area fixed to the electrode assembly 11, and has strong adhesion, is not easy to fall off, and can offset the resilience stress at the bending position of the tab 12, thereby being beneficial to avoiding the burr contact of the welding area 16 and piercing the battery case 15 (or the fusion layer of the case 15, such as the PP layer), reducing the risk of corrosion and leakage, and ensuring the safety of the battery 10. In addition, the adhesive layer 14 is not easy to fall off, the adhesive layer 14 can be prevented from being pasted again in the battery cell top sealing process, rework is avoided, and the battery cell top sealing efficiency is favorably ensured.

It should be understood that the thickness of the adhesive layer 14 and the size of each portion also affect the bonding strength between the adhesive layer 14 and the electrode assembly 11 to some extent, and therefore, the thickness of the adhesive layer 14 and the size of each portion are further described in the following exemplary embodiments.

Too thick a gel layer 14 increases the space between the top and bottom surfaces of the electrode assembly 11 and the case 15, increasing the overall thickness of the cell. The adhesive layer 14 is too thin and is easily punctured by the burrs in the welding area 16, so that the burrs cannot be effectively prevented from contacting and puncturing the aluminum film of the shell 15. Herein, the thickness of the adhesive layer 14 may be between 0.010 to 0.050 millimeters (mm).

Referring to fig. 1 to 5, the distance D3 between the first tab lead 13 and the second tab lead 13 is greater than the sum of the widths of the portions of the first adhesive layer 14 and the second adhesive layer 14 between the two tab leads 13, i.e., D3 > (W2+ W3).

For any glue line 14, in the third direction z, the length (W1+ W2+ W3) of any glue line 14 is greater than the length of a corresponding welding region 16. The width L2 of the second portion 14b of the gel layer 14 in the thickness direction of the electrode assembly 11, i.e., in the second direction y, is greater than the height of the corresponding one of the welding regions 16. The first direction x, the second direction y and the third direction z are positive directions of three coordinate axes of the three-dimensional rectangular coordinate system.

The length of the gel layer 14 may be adaptively set according to the electrode assembly 11. For example, 2 mm. ltoreq. W2. ltoreq. D1, D1 being the distance between a tab lead 13 and the nearest edge of the electrode assembly 11. Similarly, 2mm W3D 5, D5 is the distance between the other tab lead 13 and the nearest edge of the electrode assembly 11. The width W1 of the notch 14e is determined according to the width of the tab lead 13, and W1 may be slightly wider than the width of the corresponding tab lead 13, for example, W1 is W0+ k1, and k1 has a value range of 2-6 mm, that is, 2mm ≦ W1-W0 ≦ 6 mm. W3 is smaller than D3, for example, W3 is smaller than D3-k2 when the size of W3 is larger than or equal to 2mm, and the value range of k2 is between 2mm and 4 mm.

The width L4 of the fourth portion 14d of the glue layer 14 and the width L1 of the first portion 14a may be the same, i.e., L1 is L4, which is, for example, between 5mm and 15 mm. Widths L1 and L4 are too short to bond well to electrode assembly 11; widths L1 and L4 that are too long may not be easily handled, may cause the adhesive layer 14 to wrinkle, or may reduce the efficiency of the manufacturing line. If the viscosity of the adhesive layer 14 is low, the widths L1 and L4 may be 20-30 mm.

In the state where the gel layers 14 are bonded to the electrode assembly 11, the sum (L2+ L3) of the widths of the second portion 14b and the third portion 14c of any one of the gel layers 14 is equal to the thickness of the electrode assembly 11. Additionally, the width L3 of the third portion 14c may be equal to the height D7 of a corresponding one of the weld regions 16.

Second embodiment

The embodiments of the present application are identified by the same reference numerals for the elements having the same name. On the basis of the description of the first embodiment, but referring to fig. 1, fig. 6 to fig. 9, the battery cell of the present embodiment only uses one glue layer 14, which has two notches 14e and is in a "mountain" shape structure, which is equivalent to that the first glue layer 14 and the second glue layer 14 are connected into a whole.

The distance D3 between the first tab lead 13 and the second tab lead 13 is greater than the distance W4 between the two notches 14e of the glue layer 14, i.e., D3 > W4.

The present embodiment can not only achieve the beneficial effects of the first embodiment by using one adhesive layer 14, but also simplify the mounting process compared to mounting two adhesive layers 14. In addition, the coverage area of the glue layer 14 between the first tab lead 13 and the second tab lead 13 is increased, which is advantageous for ensuring the coverage effect on the first welding region 16 and the second welding region 16.

Third embodiment

On the basis of the foregoing description of the first embodiment, but referring to fig. 1, 10 to 13, please refer to fig. 1, 10 to 13, the two adhesive layers 14 adopted by the battery cell of the present embodiment are both in a "zigzag" structure, and the two adhesive layers 14 are not overlapped.

The two layers of glue 14 may be identical in structure and shape. For any of the layers 14, the third portion 14c includes two regions, one region 14c1 being connected to the second portion 14b and being notched 14e, and the other region 14c2 being connected to the fourth portion 14b but not being notched 14e, and the fourth portion 14b also being not notched.

The width of one of the regions 14c1 is slightly greater than the height of the corresponding one of the tab leads 13 in the thickness direction (i.e., the second direction y) of the electrode assembly 11.

On the basis of achieving and having the advantages of the foregoing first embodiment, in this embodiment, the fourth portion 14b and a part of the third portion 14c (i.e., the region 14c2) of any one of the adhesive layers 14 are not provided with a notch, so that the bonding area between the adhesive layer 14 and the electrode assembly 11 can be increased, which is more beneficial to enhancing the adhesive force and is less prone to falling off.

Fourth embodiment

On the basis of the foregoing description of the third embodiment, but referring to fig. 1, 14 to 17, the battery cell of the present embodiment adopts one adhesive layer 14 having two notches 14e and in a parallel "loop" shape structure, which is equivalent to the first adhesive layer 14 and the second adhesive layer 14 of the third embodiment being connected into a whole.

The distance D3 between the first tab lead 13 and the second tab lead 13 is greater than the distance W4 between the two notches 14e of the glue layer 14, i.e., D3 > W4.

The present embodiment can not only achieve the beneficial effects of the third embodiment through one adhesive layer 14, but also simplify the mounting process compared to mounting two adhesive layers 14. In addition, the coverage area of the glue layer 14 between the first tab lead 13 and the second tab lead 13 is increased, which is advantageous for ensuring the effect of covering the first welding region 16 and the second welding region 16.

The embodiment of the present application also provides a battery, which may have a battery cell of any one of the foregoing embodiments, such as the battery 10 shown in fig. 1, and the battery cell is disposed in a casing of the battery. The battery can produce beneficial effects of the battery core of the corresponding embodiment.

In another embodiment, the present application provides an electric device including the battery 10 of any one of the above embodiments. The electric device may be implemented in various specific forms, for example, in practical application scenarios, the electric device includes, but is not limited to, electronic products such as mobile communication, electric car, electric bicycle, electric navigation tool, unmanned aerial vehicle, and the like.

It will be appreciated by those skilled in the art that the configuration according to the embodiments of the present application can be applied to stationary type electric devices in addition to elements specifically used for mobile purposes.

Since the electric device has the battery 10 of any one of the foregoing embodiments, the electric device can produce the advantageous effects of the battery 10 of the corresponding embodiment.

The above description is only a part of the embodiments of the present application, and not intended to limit the scope of the present application, and all equivalent structural changes made by using the contents of the specification and the drawings are included in the scope of the present application.

Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element, and that elements, features, or elements having the same designation in different embodiments may or may not have the same meaning as that of the other elements, and that the particular meaning will be determined by its interpretation in the particular embodiment or by its context in further embodiments.

In addition, although the terms "first, second, third, etc. are used herein to describe various information, such information should not be limited to these terms. These terms are only used to distinguish one type of information from another. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well. The terms "or" and/or "are to be construed as inclusive or meaning any one or any combination. An exception to this definition will occur only when a combination of elements, functions, steps or operations are inherently mutually exclusive in some way.