CN114759271A - Method for manufacturing battery roll core, battery and electronic device - Google Patents

Abstract

The invention discloses a manufacturing method of a battery winding core, a battery and an electronic device, wherein the manufacturing method of the battery winding core comprises a welding process, a winding process and a cutting process. The welding process includes welding a plurality of first foils on the unwinding portion of the first coil, and each first foil is welded on the first coil at one time; the winding process includes welding the first foils on the first coil. The unrolled part of the first coil, the diaphragm and the unrolled part of the second coil of the foil material are wound to form a core, and the cutting process includes cutting the unrolled part of the first coil, the diaphragm and the unrolled part of the second coil. ; Each time the unrolled portion of the first roll is cut, the unrolled portion of the first roll is cut off from the first foil, and the first foil is cut into two first tabs at the same time. The manufacturing method of the battery core provided by the present invention can reduce the welding times of the negative electrode or the positive electrode and improve the production efficiency when manufacturing the core with two negative electrodes or two positive electrodes.

Description

Manufacturing method of battery core, battery and electronic equipment

technical field

The present invention relates to the technical field of batteries, and in particular, to a method for manufacturing a battery winding core, a battery and an electronic device.

Background technique

At present, in order to reduce the internal resistance of some batteries, the negative tab of the winding core is connected with two negative tabs, and the two negative tabs are electrically connected to the outer shell of the battery, or the positive tab of the winding core is connected with two positive tabs, and the positive tab is connected to the outer shell of the battery. The poles of the battery are electrically connected. In the prior art, compared with the production of winding cores with a single positive electrode tab and a single negative electrode tab, when producing a battery with two negative electrode tabs or two positive electrode tabs, it is necessary to weld two electrodes on the negative electrode sheet before each production of a winding core. One negative lug or two positive lugs are welded on the positive plate, which is equivalent to the need to weld the negative lug or positive lug twice for each winding core during the production process. lead to reduced production efficiency.

SUMMARY OF THE INVENTION

The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a method for manufacturing a battery winding core, which can effectively reduce the welding times of the negative electrode or positive electrode ears and improve production efficiency when manufacturing a winding core with two negative electrode tabs or two positive electrode tabs.

The present invention also provides a battery whose winding core is manufactured by the above-mentioned manufacturing method.

The present invention also provides an electronic device having the above-mentioned battery.

The method for manufacturing a battery core according to the embodiment of the first aspect of the present invention includes a welding process, a winding process and a cutting process. The welding process includes welding a plurality of first foils on the unwinding portion of the first coil, and each of the first foils is welded on the first coil at one time; the winding process includes welding The unrolled portion of the first coil, the diaphragm and the unrolled portion of the second coil to which the first foil is welded, are wound to form a core, and the cutting process is performed during the winding process. The cutting process includes cutting the unrolled portion of the first coil material, the diaphragm and the unrolled portion of the second coil material, and cutting the unrolled portion of the first coil material, the diaphragm and the unrolled portion of the second coil material; Alternatively, the cutting step includes a step of cutting the unrolled portion of the first coil material and the unrolled portion of the second coil material to which the first foil material is welded, and the unrolled portion of the first coil material is cut. Cutting to form a first pole piece, cutting the second coil material to form a second pole piece, and the winding process includes winding the first pole piece, the diaphragm and the second pole piece to form a core; wherein , each time the unrolled portion of the first roll is cut, the unrolled portion of the first roll is cut from the first foil, and the first foil is cut into two pieces at the same time. and first tabs so that each of the winding cores has two first tabs.

The method for manufacturing a battery core according to an embodiment of the present invention has at least the following beneficial effects: in the cutting process, each time the unrolled portion of the first roll is cut, the first roll is cut from the first foil. The unfolded part of the material is cut off, and the first foil is cut into two first tabs at the same time, so in the process of mass production of the core, the manufactured core can have two first tabs, And for each coil core, it is equivalent to welding the first foil once to obtain two first tabs, where the first coil is a negative coil or a positive coil, then the first tab is Negative tabs or positive tabs, that is, the manufactured winding core has two negative tabs or positive tabs. In this way, the method for manufacturing a battery reel core provided by the present invention can effectively reduce the welding times of the negative tabs or the positive tabs and improve production efficiency.

According to some embodiments of the present invention, the first coil is a negative electrode coil, the second coil is a positive electrode coil, and the first tab formed by cutting the first foil is a negative electrode tab .

According to some embodiments of the present invention, the first coil is a positive electrode coil, the second coil is a negative electrode coil, and the first tab formed by cutting the first foil is a positive electrode tab .

According to some embodiments of the present invention, each of the first foils is welded on the first coil at one time by ultrasonic welding equipment or row welding equipment.

According to some embodiments of the present invention, the first foil is copper foil, nickel foil, or copper-nickel composite foil.

According to some embodiments of the present invention, after the welding process is completed and before the winding process is performed, an insulating adhesive is attached to the welding place of the first foil material and the first coil material.

According to some embodiments of the present invention, the insulating glue is one or more of PET insulating tape, PP insulating tape, and BOPP insulating tape

According to some embodiments of the present invention, a finishing process and a testing process are also included. The finishing process is performed after the winding process and the cutting process are completed, and the finishing process includes sticking a termination glue on the tail end of the core; the testing process is performed after the finishing process is completed, and the finishing process is performed. The testing procedure includes short circuit testing the core.

The battery according to the embodiment of the second aspect of the present invention includes a winding core, and the winding core is manufactured by the above-mentioned manufacturing method of a battery winding core.

The battery according to the embodiment of the present invention has at least the following beneficial effects: the winding core of the battery is manufactured by the above-mentioned manufacturing method of the battery winding core, and the winding core has two negative electrodes or positive electrodes, thereby reducing the internal resistance of the battery, and in mass production In the process of winding the core, the welding times of the negative electrode ear or the positive electrode ear can be effectively reduced, and the production efficiency of the winding core can be effectively improved.

An electronic device according to an embodiment of the third aspect of the present invention includes the above-mentioned battery.

The electronic device according to the embodiment of the present invention has at least the following beneficial effects: by using the above-mentioned battery, the internal resistance of the battery can be reduced, and the production efficiency of the winding core of the battery can be improved.

Additional aspects and advantages of the present invention will be set forth, in part, from the following description, and in part will be apparent from the following description, or may be learned by practice of the invention.

Description of drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of embodiments taken in conjunction with the accompanying drawings, wherein:

1 is a partial schematic diagram of the prior art for producing a winding core with two negative electrode tabs or two positive electrode tabs;

2 is a schematic diagram of a manufacturing method (welding process and cutting process) of a battery core according to an embodiment of the present invention;

3 is a schematic diagram of a winding core (the first winding material is a negative electrode winding material, and the winding core has two negative electrode tabs) manufactured by the method for manufacturing a battery winding core shown in FIG. 2 ;

Fig. 4 is the enlarged view of A place in Fig. 3;

FIG. 5 is a schematic view of the winding core shown in FIG. 3 in another direction.

Reference number:

Core 100, first coil 110, first pole piece 110a, first foil 120, first tab 121, separator 140, second roll 130, second pole piece 130a, second foil, second Tabs 151 , termination glue 160 .

Detailed ways

The following describes in detail the embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary, only used to explain the present invention, and should not be construed as a limitation of the present invention.

In the description of the present invention, it should be understood that the azimuth description, such as the azimuth or position relationship indicated by up, down, front, rear, left, right, etc., is based on the azimuth or position relationship shown in the drawings, only In order to facilitate the description of the present invention and simplify the description, it is not indicated or implied that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.

In the description of the present invention, the meaning of several is one or more, the meaning of multiple is two or more, greater than, less than, exceeding, etc. are understood as not including this number, above, below, within, etc. are understood as including this number. If it is described that the first and the second are only for the purpose of distinguishing technical features, it cannot be understood as indicating or implying relative importance, or indicating the number of the indicated technical features or the order of the indicated technical features. relation.

In the description of the present invention, unless otherwise clearly defined, words such as setting, installation, connection should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meaning of the above words in the present invention in combination with the specific content of the technical solution.

In order to facilitate the understanding of those skilled in the art, FIG. 1 shows a principle of producing a core 100 with two negative electrodes or two positive electrodes in the prior art. During the production process, the first coil 110 is The first pole piece 110a is cut out, and then two first pole lugs 121 are welded on the first pole piece 110a. After the welding is completed, the first pole piece 110a, the diaphragm 140 and the second pole piece 130a are wound to form a roll Core 100. When the first coil 110 is a negative electrode coil, the first pole piece 110a is a negative electrode piece, and the first electrode tab 121 is a negative electrode tab, so the core 100 has two negative electrode tabs; similarly, the first coil 110 is a positive electrode When the material is rolled, the first pole piece 110a is a positive pole piece, and the first pole tab 121 is a positive pole tab, so the winding core 100 has two positive pole tabs. Compared with the production of the winding core 100 with a single negative electrode tab and a single positive electrode tab, in the prior art, when the winding core 100 with two negative electrode tabs or two positive electrode tabs is produced, each winding core 100 needs to weld the first tab 121 . The number of times increases, resulting in a decrease in production efficiency.

2 to 4 , a method for manufacturing a battery core provided by an embodiment of the present invention includes a welding process, a winding process, and a cutting process. The welding process includes welding a plurality of first foils 120 on the unrolled portion of the first coil 110, and each first foil 120 is welded on the first coil 110 at one time. In the manufacturing process of a certain core 100 , the winding process includes winding the unrolled portion of the first coil 110 to which the first foil 120 is welded, the separator 140 and the unrolled portion of the second coil to form a roll The core 100 is then subjected to a cutting process during the winding process, that is, after the unrolled portion of the first coil 110, the diaphragm 140 and the unrolled portion of the second coil are partially wound, the cutting process is performed, and the cutting process includes: The unrolled portion of the first coil 110, the diaphragm 140, and the unrolled portion of the second coil to which the first foil 120 is welded are cut, and the unrolled portion of the first coil 110, the diaphragm 140, and the unrolled portion of the second coil are unrolled. Partially cut off, disconnect the first coil 110 and the second coil from the core 100, and then continue to wind the unwound part of the core 100, so that the core 100 can be produced. In the mass production process, the The above-mentioned winding process and cutting process can be continuously cycled, thereby mass-producing the core 100 . Wherein, each time the unrolled portion of the first roll material 110 is cut, the unrolled portion of the first roll material 110 is cut from the first foil material 120, and at the same time, the first foil material 120 is cut into two first The tabs 121, that is, the first foil material 120 is welded at the cutting position of the first coil material 110 in the welding process. Therefore, in the process of mass production of the core 100, the manufactured core 100 can have two There are first tabs 121 , and the total amount of the manufactured winding cores 100 is basically the same as the total amount of welded first foils 120 . For each winding core 100 , it is equivalent that each winding core 100 only needs to be welded once. The first foil 120 can obtain two first tabs 121 , wherein, when the first coil 110 is a negative coil, the first tab 121 is a negative tab, and when the first coil 110 is a positive coil, then The first tab 121 is a positive tab, and the winding core 100 manufactured in this way has two negative tabs or two positive tabs, thus, it is the same as the existing method for manufacturing the winding core 100 having two negative tabs or two positive tabs. In comparison, the method for manufacturing a battery winding core provided by the present invention can effectively reduce the welding times of the negative electrode lugs or the positive electrode lugs, and improve the production efficiency.

Referring to FIGS. 2 to 4 , of course, in some embodiments, for the manufacturing process of a certain winding core 100 , the winding process may also be performed after the cutting process. Specifically, the cutting process includes butt welding. The unrolled portion of the first coil 110 and the unrolled portion of the second coil of the first foil 120 are subjected to a cutting process, the unrolled portion of the first coil 110 is cut to form the first pole piece 110a, and the second coil 110 is cut. Cutting to form the second pole piece 130a, the winding process includes winding the first pole piece 110a, the diaphragm 140 and the second pole piece 130a to form the winding core 100, so a winding core 100 can be produced. The cutting process and winding process can be carried out continuously and then continuously cycled. Of course, the cutting process and the winding process can also be carried out separately, that is, a batch of first pole pieces 110a and diode pieces are manufactured through the cutting process, and then these first pole pieces 110a and the second pole pieces 110a and the second pole pieces are produced through the winding process. Sheet 130a is wound with membrane 140 to form a batch of cores 100 . Since each time the unrolled portion of the first roll material 110 is cut, the unrolled portion of the first roll material 110 is cut from the first foil material 120, and the first foil material 120 is cut into two first poles at the same time Therefore, in the mass production process, when the winding process can also be performed after the cutting process, the manufactured core 100 can still have two first tabs 121, and the manufactured core 100 has a total of The amount is basically the same as the total amount of the welded first foils 120 , that is, it is equivalent to welding the first foils 120 once for each core 100 to obtain two first tabs 121 .

When the existing production line mass-produces winding cores 100 of a single positive electrode tab and a single negative electrode tab, the total amount of the manufactured winding cores 100 is basically the same as the total amount of welded negative electrode tabs (or positive electrode tabs). When using the existing method to manufacture a battery with two negative electrode tabs or two positive electrode tabs, the efficiency of manufacturing the winding core 100 is reduced due to the increase in the number of weldings. Add welding equipment or improve welding equipment.

It is easy to imagine that, when the method for manufacturing a battery winding core provided by the present invention is applied to an existing production line, during the mass production of the winding core 100 with two negative electrode tabs or two positive electrode tabs by using the existing production line, it can be Adjust the welding position of the first foil material 120, and weld the first foil material 120 at the cutting position of the first coil material 110, and then the roll core 100 with two negative electrode tabs or two positive electrode tabs can be produced. Under the condition that the number of winding cores 100 is the same, the number of welding of the first foil 120 in this method is the same as the number of welding negative lugs when producing the winding core 100 with a single positive electrode lug and a single negative electrode lug, that is, this method will not lead to production. Efficiency is reduced, in other words, the present method increases the cost of manufacturing a core 100 with two negative or two positive tabs compared to the existing production of a core 100 with two negative tabs or two positive tabs. Efficiency, and no need to modify the production line, saving the cost of production line modification.

In addition, the first tab 121 is formed by cutting the first foil material 120, and the thickness of the foil material is usually relatively thin, which is convenient for welding and cutting. When packing the roll core 100 into the battery case, it is convenient to bend the first tab 121 .

Referring to FIGS. 3 and 4 , it is conceivable that, in some embodiments, the first coil 110 is a negative electrode coil, the second coil is a positive electrode coil, and the first foil 120 is cut from the first foil 120 to form the first coil. The tabs 121 are negative tabs. Thus, in the mass production process, according to the above-mentioned manufacturing method of a battery winding core, the manufactured winding core 100 has two negative electrode tabs.

It is conceivable that, in some embodiments, the first coil material 110 is a positive electrode coil material, the second coil material is a negative electrode coil material, and the first tab 121 formed by cutting the first foil 120 is a positive electrode tab, In this way, in the mass production process, according to the above-mentioned manufacturing method of a battery winding core, the manufactured winding core 100 has two positive electrode tabs.

3 to 5 , in a specific implementation process, a second foil is welded on the unrolled portion of the second coil, wherein one second foil can be welded to two adjacent two on the unrolled portion of the second coil. Therefore, when the unwinding part of the second coil performs the cutting process, the second foil will not be cut. After the unwinding part of the second coil completes the winding process and the cutting process, the The second foil forms the second tab 151 , and the manufactured core 100 may have one second tab 151 . Of course, it is easy to imagine that, in some embodiments, referring to the arrangement of the first foil material 120, the second foil material can also be welded at the cutting position of the unwinding portion of the second coil material. When the coil is cut, the unrolled portion of the second coil is cut from the second foil, and the second foil is cut to form two second tabs 151. In this way, the coil produced by the above method The core 100 may have two second tabs 151 .

It is conceivable that, in some embodiments, during the welding process, each first foil 120 is welded to the first coil 110 at one time by ultrasonic welding equipment or row welding equipment or other welding equipment.

It is conceivable that, in some embodiments, when the first coil 110 is a negative electrode coil and the first tab 121 cut from the first foil 120 is a negative tab, the first foil 120 is a copper foil , nickel foil, or copper-nickel composite foil and other foils. The thickness of the first foil material 120 is 4.0 μm˜20 μm, and the thickness of the first foil material 120 is thin, which can facilitate welding, cutting and other operations on the first foil material 120 . It is convenient to bend the negative tab, and then connect the negative tab to the battery case.

It is conceivable that, in some embodiments, the above-mentioned positive electrode tabs may be foils such as aluminum foil, rolled nickel foil, etc. In this case, the thickness of the positive electrode tabs may be 4.0 μm˜20 μm.

It is conceivable that, in some embodiments, after the welding process is completed and before the winding process, an insulating adhesive is applied to the welding place of the first foil material 120 and the first coil material 110 to prevent the first foil material 120 from being welded. The burrs generated during the welding process with the first coil 110 pierce the diaphragm 140 , thereby reducing the short circuit of the coil core 100 .

It is conceivable that, in some embodiments, the insulating adhesive is one or more of PET insulating adhesive paper, PP insulating adhesive paper, and BOPP insulating adhesive paper.

It is conceivable that, in some embodiments, the above-mentioned negative electrode coil includes a negative electrode substrate, and the surface of the negative electrode substrate is provided with a negative electrode active material. Wherein, the negative electrode active material may be one or more of materials such as graphite, lithium titanate, and silicon carbon. In the specific implementation process, the surface of the negative electrode substrate is left blank at the position where the negative electrode tab is welded, that is, the surface of the negative electrode substrate is free from the negative electrode active material at the position where the positive electrode tab is welded, so as to ensure that the negative electrode tab is better welded on the negative electrode substrate. , to ensure a good electrical connection between the negative electrode tab and the negative electrode substrate.

It is conceivable that, in some embodiments, the above-mentioned positive electrode coil includes a positive electrode substrate, and the surface of the positive electrode substrate is provided with a positive electrode active material, wherein the positive electrode active material can be lithium cobaltate, lithium manganate, iron phosphate One or more of lithium and other substances. In the specific implementation process, the surface of the positive electrode substrate is left blank at the position where the positive electrode lug is welded, and the surface of the positive electrode substrate is free from the positive active material at the position where the positive electrode lug is welded, so as to ensure that the positive electrode lug is better welded on the positive electrode substrate.

It is easy to imagine that, compared with the prior art, when the winding core 100 with two negative electrode tabs or two positive electrode tabs is manufactured by using the method for manufacturing a battery winding core provided by the present invention, the first coil 110 needs to be left blank. There are fewer positions, which can reduce the difficulty of manufacturing the first coil 110 .

Referring to FIGS. 3 to 5 , it is conceivable that, in some embodiments, the above-mentioned manufacturing method of a battery core further includes a finishing process and a testing process. The finishing process is carried out after the winding process and the cutting process are completed. The finishing process includes sticking the termination glue 160 on the end of the winding core 100 to keep the winding core 100 in shape and prevent the winding core 100 from unfolding; the testing process is carried out after the finishing process is completed. , the testing process includes performing a short-circuit test on the winding core 100 to detect whether the winding core 100 is short-circuited, and to control the production quality of the winding core 100 .

It is conceivable that the battery provided by the embodiment of the present invention includes a winding core 100, and the winding core 100 is manufactured by the above-mentioned manufacturing method of a battery winding core. The winding core 100 of the battery is manufactured by the above-mentioned manufacturing method of the battery winding core. The winding core 100 has two negative electrodes or positive electrodes, thereby reducing the internal resistance of the battery, and during the mass production of the winding core 100, it can effectively reduce the number of negative electrodes or positive electrodes. The number of welding of the positive electrode ear can effectively improve the production efficiency of the winding core 100 .

It is conceivable that the electronic device provided by the embodiment of the present invention includes the above-mentioned battery. By using the above-mentioned battery, the internal resistance of the battery can be reduced, and the production efficiency of the winding core 100 of the battery can be improved.

The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity, all possible combinations of the technical features in the above-described embodiments are not described. However, as long as there is no contradiction between the combinations of these technical features, All should be regarded as the scope described in this specification.

The embodiments of the present invention have been described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above-mentioned embodiments. Within the scope of knowledge possessed by those of ordinary skill in the technical field, various modifications can be made without departing from the purpose of the present invention. kind of change.

Claims (10)

1. A method for manufacturing a battery core, comprising: The welding process includes welding a plurality of first foils (120) on the unrolled portion of the first coil (110), and each of the first foils (120) is welded to the first coil (110) at one time. 110) on; A winding process and a cutting process, wherein the winding process includes unrolling the unrolled portion of the first coil (110), the separator (140), and the second coil to which the first foil (120) is welded The winding core (100) is formed by winding, and the cutting process is performed during the winding process. The unrolled portion is cut, and the unrolled portion of the first coil (110) and the unrolled portion of the second coil are cut off; or The cutting process includes cutting the unrolled portion of the first coil material (110) and the unrolled portion of the second coil material to which the first foil material (120) is welded, and cutting the first roll material. The unfolded part of the material (110) is cut to form a first pole piece (110a), the second coil is cut to form a second pole piece (130a), and the winding process comprises the first pole piece (110a) , the diaphragm (140) and the second pole piece (130a) are wound to form a winding core (100); Wherein, each time the unrolled portion of the first roll material (110) is cut, the unrolled portion of the first roll material (110) is cut from the first foil material (120), and at the same time the unrolled portion of the first roll material (110) is cut off. The first foil (120) is cut into two first tabs (121) so that each of the cores (100) has two first tabs (121). 2. The method for manufacturing a battery core according to claim 1, wherein the first coil (110) is a negative electrode coil, the second coil is a positive electrode coil, and the first coil (110) is a positive electrode coil. The first tab (121) formed by cutting the foil (120) is a negative tab. 3. The method for manufacturing a battery core according to claim 1, wherein the first coil (110) is a positive electrode coil, the second coil is a negative electrode coil, and the first coil (110) is a negative electrode coil. The first tab (121) formed by cutting the foil (120) is a positive tab. 4. The method for manufacturing a battery core according to claim 1, wherein each of the first foils (120) is welded to the first coil at one time by ultrasonic welding equipment or row welding equipment. (110) on. 5 . The method for manufacturing a battery core according to claim 2 , wherein the first foil material ( 120 ) is copper foil, nickel foil, or copper-nickel composite foil. 6 . 6. The method for manufacturing a battery winding core according to claim 1, further comprising the steps of: After the welding process is completed and before the winding process is performed, an insulating adhesive is applied to the welding place of the first foil material (120) and the first coil material (110). 7 . The method for manufacturing a battery core according to claim 6 , wherein the insulating adhesive is one or more of PET insulating adhesive tape, PP insulating adhesive tape, and BOPP insulating adhesive tape. 8 . 8. The method for manufacturing a battery winding core according to claim 1, further comprising the steps of: The finishing process is performed after the winding process and the cutting process are completed, and the finishing process includes applying a termination glue (160) to the rear end of the winding core (100); The testing process is performed after finishing the finishing process, and the testing process includes short-circuit testing on the winding core (100). 9 . A battery, characterized in that it comprises a winding core ( 100 ), and the winding core ( 100 ) is manufactured by the method for manufacturing a battery winding core according to any one of claims 1 to 8 . 10. An electronic device, comprising the battery of claim 9.

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