阅读说明：本技术 极片翻折贴胶的加工方法及电池 (Processing method of pole piece folding adhesive tape and battery ) 是由 曹海霞 杨琪 杨达奇 梁振辉 于 2019-10-22 设计创作，主要内容包括：本发明提供一种极片翻折贴胶的加工方法及电池,极片翻折贴胶的加工方法包括将极片裁切成第一极片段和第二极片段；将第一极片段靠近第二极片段的一部分进行翻折,使第一极片段形成极耳部和极片部,极耳部与极片部之间部分重叠；对第二极片段与翻折后的第一极片段进行贴胶处理,使第一极片段和第二极片段重新形成一个整体。及通过该极片翻折贴胶的加工方法加工得到的电池。极片翻折贴胶的加工方法具有可对极片进行翻折加工,使极片的一部分形成极耳的优点。(The invention provides a processing method of pole piece folding rubberizing and a battery, wherein the processing method of the pole piece folding rubberizing comprises the steps of cutting a pole piece into a th pole piece section and a second pole piece section, folding parts of the th pole piece section, which are close to the second pole piece section, so that th pole piece sections form pole lug parts and pole piece parts, the pole lug parts are partially overlapped with the pole piece parts, rubberizing is carried out on the second pole piece section and a folded th pole piece section, and the th pole piece section and the second pole piece section form whole bodies again.)

1. The processing method of the pole piece folding rubberizing is characterized by comprising the following steps:

cutting the pole piece into th pole segment and second pole segment;

folding the pole piece segment near portion of the second pole piece segment such that the pole piece segment forms a pole ear portion and a pole piece portion, the pole ear portion and the pole piece portion partially overlapping;

and gluing the second pole segment and the folded th pole segment to ensure that the th pole segment and the second pole segment form whole bodies again.

2. The processing method of the pole piece folding rubberizing according to claim 1, characterized in that:

the step of folding over portion of the pole piece segment adjacent the second pole piece segment to form a pole ear portion and a pole piece portion comprises:

and (3) turning and bending the part of the th pole piece segment, which is close to the second pole piece segment, to the outside of the th pole piece segment by a preset angle, and pressing and shaping the bent part to enable the th pole piece segment to form the pole ear part and the pole piece part.

3. The processing method of the pole piece folding rubberizing according to claim 2, characterized in that:

the included angle between the pole ear part and the pole piece part is 70-110 degrees.

4. The processing method of the pole piece folding rubberizing according to claim 3, wherein:

the polar ear part and the polar plate part form an included angle of 90 degrees.

5. The processing method of the pole piece folding rubberizing according to claim 1, characterized in that:

the step of gluing the folded th pole segment and the second pole segment further includes:

and before the rubberizing treatment, the second pole piece part is positioned on the extension line of the pole piece part.

6. The processing method of the pole piece folding rubberizing according to claim 5, wherein:

the step of gluing the folded th pole segment and the second pole segment further includes:

and when the rubberizing treatment is carried out, the adhesive tapes are respectively attached to the pole piece part, the pole ear part and the second segment.

7. The processing method of the pole piece folding rubberizing according to claim 6, wherein:

the step of gluing the folded th pole segment and the second pole segment further includes:

adhering a tape layer on the surfaces of the pole piece and the second pole piece;

and adhering a second adhesive tape layer on the second surfaces of the th pole segment and the second pole segment.

8. The processing method of the pole piece folding and pasting glue of any in claims 5 to 7, wherein:

the step of gluing the folded th pole segment and the second pole segment further includes:

before the rubberizing treatment is carried out, the second pole segment is parallel to the pole piece part, and the second pole segment and the pole piece part are located on the same straight line.

9. The processing method of the pole piece folding and pasting glue of any of claims 1 to 7, wherein:

the step of gluing the folded th pole segment and the second pole segment further includes:

and during the rubberizing treatment, the distance between the th pole segment and the second pole segment is 2 mm to 4 mm.

10. The battery comprises a shell and an electric core, wherein the electric core is arranged in the shell, and comprises a pole segment, and the battery is characterized in that:

the end of the pole piece section is turned over, makes the pole piece section form pole ear portion and pole piece portion, pole ear portion with partly overlap between the pole piece portion, pole ear portion with electrode electricity on the casing is connected.

Technical Field

The invention relates to the technical field of battery production, in particular to a processing method of pole piece folding rubberizing and a battery manufactured by the processing method of the pole piece folding rubberizing.

Background

In recent years, with the rapid development of the lithium battery industry, the lithium battery has become the most popular battery used in current portable electronic devices, and the lithium battery gradually replaces the nickel-cadmium rechargeable battery due to the unique properties of high energy density, light weight, great construction flexibility and the like of the lithium battery.

At present, the pole piece and the utmost point ear of lithium cell are two individuals that independently exist, and in the lithium cell production process, will cut the utmost point ear welding on the pole piece through ultrasonic welding technique or laser welding technique to fix pole piece and utmost point ear play and make between the two realize the electricity and connect, however, the problem that this kind of processing technology exists is:

, easily persist the burr on the utmost point ear of cutting out, lead to when utmost point ear fixed back to the pole piece, the diaphragm is impaled to the burr easily, causes the positive pole piece and the negative pole piece of lithium cell to take place the short circuit to make the short circuit appear in the lithium cell of rolling up out.

Secondly, when the condition of desoldering appears between utmost point ear and the pole piece, can lead to the unable normal use of the lithium cell of rolling out.

Thirdly, in the production process of the lithium battery cell, besides the tab material roll, the tab material roll needs to be additionally configured for matching processing, so that production materials are increased, and the production cost is improved.

Disclosure of Invention

In order to solve the above problems, the main object of the present invention is to provide methods for folding and pasting pole pieces, in which the part of the pole piece is formed into a tab.

Another objective of the invention is to provide batteries that use tabs folded partially over the portion of the pole piece itself.

In order to achieve the main purpose of the invention, the invention provides a processing method of pole piece folding and rubberizing, wherein the processing method comprises the steps of cutting a pole piece into a pole piece section and a second pole piece section, folding a part of the pole piece section close to the second pole piece section to enable the pole piece section to form a pole ear part and a pole piece part, wherein the pole ear part and the pole piece part are partially overlapped, and rubberizing is conducted on the second pole piece section and a folded pole piece section to enable the pole piece section and the second pole piece section to form whole bodies again.

Therefore, the processing method of the pole piece folding and pasting glue provided by the invention can effectively and reliably fold parts of the pole piece to form the pole lug for use, so that an extra pole lug material roll does not need to be configured for the pole piece in the pole piece processing process, and processing procedures such as pole lug cutting, pole lug welding and the like do not need to be carried out, the processing steps of the pole piece are simplified, meanwhile, the risk that the pole piece is pierced by burrs attached to the pole lug can be eliminated, and the production cost of a battery is reduced.

preferably, the step of folding back the portion of the pole segment near the second pole segment to form the pole ear portion and the pole piece portion includes folding back the portion of the pole segment near the second pole segment to a predetermined angle outside the pole segment, and pressing and shaping the bend to form the pole segment into the pole ear portion and the pole piece portion.

It is from top to bottom visible, press the design through the department of turning over of antipodal ear portion and pole piece portion, can effectually avoid rubberizing to handle and follow-up pole piece section course of working, the position skew takes place for utmost point ear portion and pole piece portion to guarantee to turn over the pole piece section after the processing and can satisfy the production requirement.

, the angle between the ear and the pole piece is 70-110 °.

A further proposal is that the angle between the tab and the pole piece is 90 °.

From top to bottom, the contained angle between utmost point ear portion and the utmost point ear portion can carry out corresponding change according to the production requirement.

In another preferable embodiments, the step of pasting the folded th pole segment and the second pole segment further includes positioning the second pole segment on an extension line of the pole piece portion before pasting.

It can be seen from above that, make the second pole piece section carry out the rubberizing after being located the extension line of pole piece portion and handle, can guarantee that the whole that utmost point piece and second pole piece section reformed again can satisfy the automated production requirement of electric core coiling equipment.

, the step of rubberizing the folded th pole piece and the folded second pole piece further comprises respectively applying adhesive tapes to the pole piece portion, the pole ear portion and the second pole piece during rubberizing.

Therefore, through the arrangement of the rubberizing positions, the relative position between the pole piece part and the pole lug part of the th pole segment after rubberizing is guaranteed not to be changed, and meanwhile, the reliability of connection between the th pole segment and the second pole segment is guaranteed.

Further , the step of applying adhesive to the folded pole segment and the folded second pole segment further includes applying tape layers on the surfaces of the pole segment and the second pole segment, and applying a second tape layer on the pole segment and the second surface of the second pole segment.

Therefore, the front and back of the th pole segment and the front and back of the second pole segment are both subjected to rubberizing treatment, so that the reliability of connection between the th pole segment and the second pole segment can be improved, residual burrs at the cut-off part of the pole piece section can be prevented from being exposed outside, and the risk of the pole segment being pierced by the residual burrs of the pole segment is reduced.

Further , the step of pasting the folded pole piece and the folded second pole piece further comprises, before pasting, making the second pole piece parallel to the pole piece portion and making the second pole piece and the pole piece portion be in the same line.

Therefore, the th pole segment and the second pole segment are arranged at relative positions, so that the accuracy of the relative position between the th pole segment and the second pole segment is ensured, and the accuracy of the pole piece formed again after rubberizing treatment can meet the continuous automatic production requirement of the battery cell winding equipment.

The step is further to perform a pasting process on the folded pole piece and the folded second pole piece, wherein the pasting process further includes a step of spacing the pole piece and the second pole piece by 2 mm to 4 mm.

As can be seen from the above, the distance between the th pole segment and the second pole segment can be adjusted according to the production requirement.

In order to achieve another object of the invention, the invention provides batteries, which include a casing and a battery core, wherein the battery core is installed in the casing, and the battery core includes a pole segment, wherein, the end of the pole segment is folded, so that the pole segment forms a pole ear part and a pole piece part, the pole ear part and the pole piece part are partially overlapped, and the pole ear part is electrically connected with an electrode on the casing.

Therefore, the battery provided by the invention has the advantages of simple structure, convenience in processing, low production cost, low defective rate and the like, and in addition, the probability of short circuit and fault of the battery can be effectively reduced through the structural design of the antipode segments.

Drawings

Fig. 1 is a structural diagram of a pole piece according to an embodiment of a processing method for folding and pasting a pole piece adhesive of the invention.

Fig. 2 is a state diagram of th change of the pole piece according to the embodiment of the processing method of the pole piece folding and rubberizing of the invention.

FIG. 3 is a state diagram of a change at of an th pole piece according to an embodiment of the method for folding and pasting the pole piece of the present invention.

Fig. 4 is a second variation state diagram of the th pole segment of the processing method for folding and pasting the pole piece of the invention.

Fig. 5 is a schematic diagram of the lamination of the th pole segment and the second pole segment according to the embodiment of the processing method of the folding lamination of the pole piece of the invention.

Fig. 6 is a second variation state diagram of the pole piece according to the embodiment of the processing method for folding and pasting the adhesive on the pole piece.

The invention is further illustrated in below with reference to the following figures and examples.

Detailed Description

The embodiment of the processing method of the pole piece folding rubberizing comprises the following steps:

compared with the traditional processing method for welding the cut pole lugs to the pole pieces, the processing method for the pole piece folding rubberizing provided by the invention can reduce the probability of the pole pieces being pierced, does not need to additionally arrange pole lugs for the pole pieces, saves processing materials, simplifies processing steps and reduces the production cost.

Referring to fig. 1 to 6, the processing method of the pole piece folding and rubberizing includes:

first, pole piece 1 is cut into th pole piece segment 11 and second pole piece segment 12, then, th pole piece segment 11 is folded at part close to second pole piece segment 12, so that th pole piece segment 11 forms pole ear part 111 and pole piece part 112, and part of pole ear part 111 and pole piece part 112 is overlapped, so that part of pole ear part 111 is exposed out of pole piece part 112.

As shown in fig. 3 and 4, when turning over the portion of the th pole segment 11 close to the second pole segment 12, first turning over and bending the portion of the th pole segment 11 close to the second pole segment 12 toward the outside of the th pole segment 11 by a preset angle, where the preset angle is an angle of an included angle a between the tab portion 111 and the pole piece portion 112 after the turning over is completed, and when the portion of the th pole segment 11 close to the second pole segment 12 is turned over and bent to a position according to the preset angle, pressing and shaping the bent portion 110 formed by the turning over and bending, so that the th pole segment 11 forms the tab portion 111 and the pole piece portion 112.

Preferably, the included angle a between the tab portion 111 and the pole piece portion 112 is 70 ° to 110 °, and in this embodiment, the included angle a between the tab portion 111 and the pole piece portion 112 is set to 90 ° for better working position and working stability of the tab portion 111. Of course, the included angle a between the tab portion 111 and the pole piece portion 112 can be changed to other angles according to different production requirements.

With reference to fig. 5 and 6, after the th pole segment 11 is folded, the second pole segment 12 and the folded th pole segment 11 are glued together, so that the th pole segment 11 and the second pole segment 12 are reformed into pieces.

Before the gluing process is performed on the th pole segment 11 and the second pole segment 12, the second pole segment 12 is located on the extension line of the pole piece portion 112 of the th pole segment 11, the second pole segment 12 is parallel to the pole piece portion 112 of the th pole segment 11, and the second pole segment 12 and the pole piece portion 112 of the th pole segment 11 are located on the same straight line as much as possible, so that the relative position accuracy between the th pole segment 11 and the second pole segment 12 can be ensured as much as possible, that is, the pole piece portions 112 of the second pole segment 12 and the th pole segment 11 are kept in a state before cutting as much as possible, and therefore, the accuracy of the pole piece reformed after the gluing process can meet the continuous automatic production requirement of the cell winding device.

In addition, during the taping process, tapes are respectively stuck to the tab portion 111, the pole piece portion 112, and the second pole piece 12 of the -th pole piece segment 11 so as to ensure that the tapes can effectively fix the tab portion 111, the pole piece portion 112, and the second pole piece segment 12 and prevent the relative position between the tab portion 111 and the pole piece portion 112 of the -th pole piece segment 11 from changing.

, adhering a adhesive tape layer 13 on the th surface of the pole segment 11 and the second pole segment 12, and adhering a second adhesive tape layer 14 on the th surface of the pole segment 11 and the second pole segment 12, and by applying adhesive on both the front and back surfaces of the pole segment 11 and the front and back surfaces of the second pole segment 12, the reliability of connection between the pole segment 11 and the second pole segment 12 can be improved, and burrs left at the cut parts of the pole segments can be prevented from being exposed, so that the risk that the pole segment 11 and/or the pole segment 12 are pierced by the burrs left by themselves can be reduced.

The processing method of the pole piece folding and rubberizing provided by the invention can be applied to battery cell winding equipment.

The battery embodiment:

the battery comprises a shell and a battery core, wherein the battery core is arranged in the shell, the battery core comprises a pole piece, the end of the pole piece is folded, so that a pole lug part and a pole piece part are formed on the pole piece, the pole lug part is partially overlapped with the pole piece part, and the pole lug part is electrically connected with an electrode on the shell.

In conclusion, the battery provided by the invention has the advantages of simple structure, convenience in processing, low production cost, low defective rate and the like, and in addition, the probability of short circuit and fault of the battery can be effectively reduced through the structural design of the electrode segments.

Finally, it should be emphasized that the above-described preferred embodiments of the present invention are merely examples of implementations, rather than limitations, and that many variations and modifications of the invention are possible to those skilled in the art, without departing from the spirit and scope of the invention.