Method for manufacturing battery core, battery and electronic device

Abstract

The present invention discloses a method for manufacturing a battery roll core, a battery and an electronic device, wherein the method for manufacturing a battery roll core includes a welding process, a winding process and a cutting process. The welding process includes welding a plurality of first foils to the unfolded portion of a first coil, and each first foil is welded to the first coil at one time; the winding process includes winding the unfolded portion of the first coil welded with the first foil, the diaphragm and the unfolded portion of the second coil to form a roll core, and the cutting process includes cutting the unfolded portion of the first coil, the diaphragm and the unfolded portion of the second coil; each time the unfolded portion of the first coil is cut, the unfolded portion of the first coil is cut from the first foil, and the first foil is cut into two first pole ears at the same time. The method for manufacturing a battery roll core provided by the present invention can reduce the number of welding times of the negative pole ears or the positive pole ears when manufacturing a roll core with two negative pole ears or two positive pole ears, thereby improving production efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and particularly to a manufacturing method of a battery core, a battery and an electronic device. Background Art

[0002] At present, in order to reduce the internal resistance of some batteries, two negative tabs are connected to the negative electrode sheet of the core, and the two negative tabs are electrically connected to the outer shell of the battery, or two positive tabs are connected to the positive electrode sheet of the core, and the positive tab is electrically connected to the electrode post of the battery. In the prior art, compared with the production of a core with a single positive tab and a single negative tab, when producing a battery with two negative tabs or two positive tabs, before producing each core, it is necessary to weld two negative tabs on the negative electrode sheet or weld two positive tabs on the positive electrode sheet. That is, each core needs to be welded with negative tabs or positive tabs twice during the production process, and the number of times of welding negative tabs or positive tabs for each core increases, resulting in a reduction in production efficiency. Summary of the Invention

[0003] The present invention aims to at least solve one of the technical problems existing in the prior art. For this purpose, the present invention provides a manufacturing method of a battery core, which can effectively reduce the number of welds of negative tabs or positive tabs when manufacturing a core with two negative tabs or two positive tabs, and improve production efficiency.

[0004] The present invention also provides a battery whose core is manufactured by the above manufacturing method.

[0005] The present invention also provides an electronic device having the above battery.

[0006] A method for manufacturing a battery core according to an 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 an unfolded portion of a first coil, and each of the first foils is welded to the first coil at one time; the winding process includes winding the unfolded portion of the first coil welded with the first foils, a separator, and the unfolded portion of a second coil to form a core, and the cutting process is performed during the winding process. The cutting process includes cutting the unfolded portion of the first coil, the separator, and the unfolded portion of the second coil to cut off the unfolded portion of the first coil, the separator, and the unfolded portion of the second coil; alternatively, the cutting process includes cutting the unfolded portion of the first coil welded with the first foils and the unfolded portion of the second coil, cutting off the unfolded portion of the first coil to form a first pole piece, and cutting off the second coil to form a second pole piece. The winding process includes winding the first pole piece, the separator, and the second pole piece to form a core; wherein, each time the unfolded portion of the first coil is cut, the unfolded portion of the first coil is cut from the first foil, and at the same time, the first foil is cut into two first pole ears, so that each core has two first pole ears.

[0007] 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 unfolded portion of the first coil is cut, the unfolded portion of the first coil is cut from the first foil, and at the same time, the first foil is cut into two first pole ears. Therefore, in the process of mass-producing cores, the manufactured cores can have two first pole ears, and for each core, it is equivalent to only welding the first foil once to obtain two first pole ears. Among them, if the first coil is a negative electrode coil or a positive electrode coil, the first pole ear is a negative pole ear or a positive pole ear, that is, the manufactured cores have two negative pole ears or two positive pole ears. Thus, the method for manufacturing a battery core provided by the present invention can effectively reduce the number of welding times of the negative pole ears or the positive pole ears and improve production efficiency.

[0008] 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 pole ear formed by cutting the first foil is a negative pole ear.

[0009] 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 pole ear formed by cutting the first foil is a positive pole ear.

[0010] According to some embodiments of the present invention, each of the first foils is welded to the first coil at one time by an ultrasonic welding device or a row welding device.

[0011] According to some embodiments of the present invention, the first foil is a copper foil, a nickel foil, or a copper-nickel composite foil.

[0012] According to some embodiments of the present invention, after completing the welding process and before performing the winding process, an insulating adhesive is pasted at the welded joint between the first foil and the first coil material.

[0013] According to some embodiments of the present invention, the insulating adhesive is one or more of PET insulating adhesive paper, PP insulating adhesive paper, and BOPP insulating adhesive paper.

[0014] According to some embodiments of the present invention, it further includes a finishing process and a testing process. The finishing process is performed after completing the winding process and the cutting process. The finishing process includes pasting a termination adhesive at the tail end of the core; the testing process is performed after completing the finishing process, and the testing process includes performing a short-circuit test on the core.

[0015] A battery according to an embodiment of the second aspect of the present invention includes a core, and the core is manufactured by the above-mentioned manufacturing method of the battery core.

[0016] The battery according to the embodiment of the present invention has at least the following beneficial effects: The core of the battery is manufactured by the above-mentioned manufacturing method of the battery core. The core has two negative electrode tabs or two positive electrode tabs, thereby reducing the internal resistance of the battery. Moreover, during the batch production of the core, the welding times of the negative electrode tabs or the positive electrode tabs can be effectively reduced, and the production efficiency of the core can be effectively improved.

[0017] An electronic device according to an embodiment of the third aspect of the present invention includes the above-mentioned battery.

[0018] The electronic device according to the embodiment of the present invention has at least the following beneficial effects: By adopting the above-mentioned battery, the internal resistance of the battery can be reduced, and the production efficiency of the core of the battery can be improved.

[0019] The additional aspects and advantages of the present invention will be partially given in the following description, partially become obvious from the following description, or be understood through the practice of the present invention. Description of the Drawings

[0020] The above and / or additional aspects and advantages of the present invention will become obvious and easy to understand from the description of the embodiments in conjunction with the following drawings, where:

[0021] Figure 1 It is a partial schematic diagram of the principle of producing a core with two negative electrode tabs or two positive electrode tabs in the prior art;

[0022] Figure 2 It is a schematic diagram of the principle of the manufacturing method (welding process and cutting process) of the battery core according to the embodiment of the present invention;

[0023] Figure 3 For the core manufactured by the manufacturing method of the battery core shown by Figure 2 (the first coil material is the negative electrode coil material, and the core has two negative electrode tabs); a schematic diagram

[0024] Figure 4 For Figure 3 the enlarged view of part A in

[0025] Figure 5 For Figure 3 the schematic diagram of the core shown in another direction

[0026] Reference numerals:

[0027] Core 100, first coil material 110, first pole piece 110a, first foil 120, first tab 121, separator 140, second coil material 130, second pole piece 130a, second foil, second tab 151, termination glue 160 Detailed implementation manners

[0028] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings, in which the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions from beginning to end. The embodiments described below with reference to the drawings are exemplary and are only used to explain the present invention and should not be construed as a limitation to the present invention

[0029] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by terms such as up, down, front, back, left, right, etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention

[0030] In the description of the present invention, the meaning of several is one or more, the meaning of multiple is two or more, and understandings such as greater than, less than, exceeding, etc. do not include the present number, and understandings such as above, below, within, etc. include the present number. If the first and second are described only for the purpose of distinguishing technical features, they should not be construed as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or implicitly indicating the sequence relationship of the indicated technical features

[0031] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installation, connection, etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific content of the technical solution

[0032] For the convenience of those skilled in the art to understand Figure 1The principle of manufacturing a core 100 with two negative tabs or two positive tabs in the prior art is shown. During the manufacturing process, a first electrode tab 110a is cut from a first coil 110, and then two first tabs 121 are welded to the first electrode tab 110a. After the welding is completed, the first electrode tab 110a, the separator 140, and the second electrode tab 130a are wound to form the core 100. When the first coil 110 is a negative electrode coil, the first electrode tab 110a is a negative electrode tab, and the first tab 121 is a negative tab, so the core 100 has two negative tabs; similarly, when the first coil 110 is a positive electrode coil, the first electrode tab 110a is a positive electrode tab, and the first tab 121 is a positive tab, so the core 100 has two positive tabs. Compared with manufacturing a core 100 with a single negative tab and a single positive tab, when manufacturing a core 100 with two negative tabs or two positive tabs in the prior art, the number of times of welding the first tab 121 for each core 100 increases, resulting in a reduction in production efficiency.

[0033] Refer to Figures 2 to 4The manufacturing method of the battery roll core provided by the 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 to the unfolded portion of the first coil 110, and each first foil 120 is welded to the first coil 110 at one time. For the manufacturing process of a certain core 100, the winding process includes winding the unfolded part of the first coil 110 welded with the first foil 120, the diaphragm 140 and the unfolded part of the second coil to form the core 100, and then performing a cutting process during the winding process, that is, after the unfolded part of the first coil 110, the diaphragm 140 and the unfolded part of the second coil are partially wound, a cutting process is performed, and the cutting process includes cutting the unfolded part of the first coil 110 welded with the first foil 120, the diaphragm 140 and the unfolded part of the second coil, cutting the unfolded part of the first coil 110, the diaphragm 140 and the unfolded part of the second coil, disconnecting the first coil 110, the second coil and the core 100, and then continuing to wind the unwound part of the core 100, so that the core 100 can be produced. In the mass production process, the above-mentioned winding process and cutting process can be continuously cycled to mass produce the core 100. Each time the unfolded portion of the first coil 110 is cut, the unfolded portion of the first coil 110 is cut from the first foil 120, and the first foil 120 is cut into two first pole tabs 121, that is, the first foil 120 is welded at the cutting position of the first coil 110 in the welding process. Therefore, in the process of mass production of the cores 100, the manufactured cores 100 can have two first pole tabs 121, and the total amount of the manufactured cores 100 is substantially the same as the total amount of the welded first foil 120. For each core 100, In each winding core 100, only one welding of the first foil 120 is required to obtain two first pole ears 121, wherein when the first coil 110 is a negative electrode coil, the first pole ear 121 is a negative pole ear, and when the first coil 110 is a positive electrode coil, the first pole ear 121 is a positive pole ear. The winding core 100 manufactured in this way has two negative pole ears or two positive pole ears. Thus, compared with the existing method for manufacturing a winding core 100 with two negative pole ears or two positive pole ears, the manufacturing method of the battery winding core provided by the present invention can effectively reduce the number of welding times of the negative pole ears or the positive pole ears and improve production efficiency.

[0034] Reference Figures 2 to 4, of course, in some embodiments, for the manufacturing process of a certain core 100, the winding process can also be carried out after the cutting process. Specifically, the cutting process includes cutting the unfolded parts of the first coil 110 welded with the first foil 120 and the unfolded part of the second coil, cutting the unfolded part of the first coil 110 to form the first pole piece 110a, and cutting the second coil to form the second pole piece 130a. The winding process includes winding the first pole piece 110a, the separator 140, and the second pole piece 130a to form the core 100. Thus, a core 100 can be produced. During mass production, the cutting process and the winding process can be carried out continuously and then cycle continuously. 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 second pole pieces are manufactured through the cutting process, and then these first pole pieces 110a, second pole pieces 130a, and the separator 140 are wound through the winding process to form a batch of cores 100. Since each time the unfolded part of the first coil 110 is cut, the unfolded part of the first coil 110 is cut from the first foil 120, and at the same time the first foil 120 is cut into two first pole tabs 121, therefore, during mass production, when the winding process can also be carried out after the cutting process, the manufactured core 100 can still have two first pole tabs 121, and the total amount of the manufactured cores 100 is also basically the same as the total amount of the welded first foil 120, that is, it is equivalent to welding the first foil 120 only once for each core 100 to obtain two first pole tabs 121.

[0035] When the existing production line mass-produces the core 100 with a single positive pole tab and a single negative pole tab, the total amount of the manufactured cores 100 is basically the same as the total amount of the welded negative pole tabs (or positive pole tabs). When manufacturing a battery with two negative pole tabs or two positive pole tabs using the existing method, due to the increase in the number of welding times, the manufacturing efficiency of the core 100 is reduced. To improve the manufacturing efficiency of the core 100, a feasible method is to transform the production line, add welding equipment or improve the welding equipment.

[0036] It is easy to imagine that when the manufacturing method of the battery core provided by the present invention is applied to an existing production line, during the process of using the existing production line to mass-produce the core 100 with two negative tabs or two positive tabs, the welding position of the first foil 120 can be adjusted to weld the first foil 120 at the cutting position of the first coil 110, and then the core 100 with two negative tabs or two positive tabs can be produced. Under the condition that the number of cores 100 produced is the same, the number of welding times of the first foil 120 in this method is the same as the number of welding times of the negative tab when producing the core 100 with a single positive tab and a single negative tab, that is, this method will not cause a reduction in production efficiency. In other words, compared with the existing production of the core 100 with two negative tabs or two positive tabs, this method improves the efficiency of manufacturing the core 100 with two negative tabs or two positive tabs, and there is no need to transform the production line, saving the production line transformation cost.

[0037] In addition, the first tab 121 is formed by cutting the first foil 120, and the thickness of the foil is usually relatively thin, which is convenient for welding and cutting. When the core 100 is packaged into the battery case, it is convenient to bend the first tab 121.

[0038] Referring to Figure 3 and Figure 4 , it can be imagined that in some embodiments, the first coil 110 is a negative coil, the second coil is a positive coil, and the first tab 121 formed by cutting the first foil 120 is a negative tab. Thus, during mass production, according to the above manufacturing method of the battery core, the manufactured core 100 has two negative tabs.

[0039] It can be imagined that in some embodiments, the first coil 110 is a positive coil, the second coil is a negative coil, and the first tab 121 formed by cutting the first foil 120 is a positive tab. Thus, during mass production, according to the above manufacturing method of the battery core, the manufactured core 100 has two positive tabs.

[0040] Referring to Figures 3 to 5, in the specific implementation process, a second foil is welded to the unfolded part of the second coil. One second foil can be welded between two adjacent cutting positions on the unfolded part of the second coil. Thus, when the unfolded part of the second coil undergoes the cutting process, the second foil will not be cut. After the unfolded part of the second coil completes the winding process and the cutting process, the second pole ear 151 is formed by the second foil, and the manufactured core 100 can have one second pole ear 151. Of course, it is easy to imagine that in some embodiments, referring to the setting method of the first foil 120, the second foil can also be welded at the cutting position of the unfolded part of the second coil. Thus, when the second coil undergoes the cutting process, the unfolded part of the second coil is cut from the second foil, and at the same time, the second foil is cut to form two second pole ears 151. In this way, the core 100 manufactured by the above method can have two second pole ears 151.

[0041] It can be imagined that in some embodiments, in the welding process, each first foil 120 is welded to the first coil 110 at one time by an ultrasonic welding device, a stitch welding device, or other welding devices.

[0042] It can be imagined that in some embodiments, when the first coil 110 is a negative electrode coil and the first pole ear 121 formed by cutting the first foil 120 is a negative electrode ear, the first foil 120 is a foil such as a copper foil, a nickel foil, or a copper-nickel composite foil. Among them, the thickness of the first foil 120 is 4.0 μm to 20 μm. The thin thickness of the first foil 120 facilitates operations such as welding and cutting of the first foil 120. When the core 100 is packaged into the battery housing, it is convenient to bend the negative electrode ear and then connect the negative electrode ear to the battery housing.

[0043] It can be imagined that in some embodiments, the above-mentioned positive electrode ear can be a foil such as an aluminum foil or a rolled nickel foil. At this time, the thickness of the positive electrode ear can be 4.0 μm to 20 μm.

[0044] It can be imagined that in some embodiments, after the welding process and before the winding process, an insulating adhesive is pasted at the welded joint of the first foil 120 and the first coil 110 to prevent the burrs generated during the welding process between the first foil 120 and the first coil 110 from piercing the separator 140, thereby reducing the short-circuit situation of the core 100.

[0045] It can be imagined 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.

[0046] It can be imagined that in some embodiments, the above-mentioned negative electrode coil includes a negative electrode substrate, and a negative electrode active material is provided on the surface of the negative electrode substrate. Among them, the negative electrode active material can be one or several of substances such as graphite, lithium titanate, silicon carbide, etc. 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, there is no negative electrode active material on the surface of the negative electrode substrate 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 and ensure good electrical connection between the negative electrode tab and the negative electrode substrate.

[0047] It can be imagined that in some embodiments, the above-mentioned positive electrode coil includes a positive electrode substrate, and a positive electrode active material is provided on the surface of the positive electrode substrate. Among them, the positive electrode active material can be one or several of substances such as lithium cobaltate, lithium manganate, lithium iron phosphate, etc. In the specific implementation process, the surface of the positive electrode substrate is left blank at the position where the positive electrode tab is welded, and there is no positive electrode active material on the surface of the positive electrode substrate at the position where the positive electrode tab is welded, so as to ensure that the positive electrode tab is better welded on the positive electrode substrate.

[0048] It is easy to imagine that compared with the prior art, when manufacturing the core 100 with two negative electrode tabs or two positive electrode tabs by using the method for manufacturing a battery core provided by the present invention, the positions that need to be left blank on the first coil 110 are fewer, which can reduce the manufacturing difficulty of the first coil 110.

[0049] Refer to Figures 3 to 5 , it can be imagined that in some embodiments, the above-mentioned method for manufacturing 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 pasting a termination adhesive 160 at the tail end of the core 100 to keep the core 100 in shape and prevent the 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 core 100 to detect whether the core 100 is short-circuited and controlling the production quality of the core 100.

[0050] It can be imagined that the battery provided by the embodiments of the present invention includes a core 100, and the core 100 is manufactured by the above-mentioned method for manufacturing a battery core. The core 100 of the battery is manufactured by the above-mentioned method for manufacturing a battery core. The core 100 has two negative electrode tabs or positive electrode tabs, thereby reducing the internal resistance of the battery, and in the process of mass-producing the core 100, the welding times of the negative electrode tabs or positive electrode tabs can be effectively reduced, and the production efficiency of the core 100 can be effectively improved.

[0051] It can be imagined that the electronic device provided by the embodiments of the present invention includes the above-mentioned battery. By adopting the above-mentioned battery, the internal resistance of the battery can be reduced, and the production efficiency of the core 100 of the battery can be improved.

[0052] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0053] The embodiments of the present invention have been described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the scope of knowledge possessed by those of ordinary skill in the art.

Claims

1. A manufacturing method of a battery core, characterized in that, Comprising: A welding process, including welding a plurality of first foils (120) onto the unfolded portion of a first coil (110), and each of the first foils (120) is welded onto the first coil (110) at one time; A winding process and a cutting process. The cutting process is carried out during the winding process or the winding process is carried out after the cutting process. When the cutting process is carried out during the winding process, the winding process includes winding the unfolded portion of the first coil (110) welded with the first foils (120), the separator (140), and the unfolded portion of the second coil to form a core (100). The cutting process includes cutting the unfolded portion of the first coil (110) and the unfolded portion of the second coil, cutting off the unfolded portion of the first coil (110) and the unfolded portion of the second coil. When the winding process is carried out after the cutting process, the cutting process includes cutting the unfolded portion of the first coil (110) welded with the first foils (120) and the unfolded portion of the second coil, cutting off the unfolded portion of the first coil (110) to form a first pole piece (110a), cutting off the second coil to form a second pole piece (130a), and the winding process includes winding the first pole piece (110a), the separator (140), and the second pole piece (130a) to form a core (100); Wherein, each time the unfolded portion of the first coil (110) is cut, the unfolded portion of the first coil (110) is cut off from the first foils (120), and at the same time, the first foils (120) are cut into two first pole tabs (121), so that each core (100) has two separated first pole tabs (121).

2. The manufacturing method of the battery core according to claim 1, characterized in that, The first coil (110) is a negative electrode coil, the second coil is a positive electrode coil, and the first pole tabs (121) formed by cutting the first foils (120) are negative electrode tabs.

3. The manufacturing method of the battery core according to claim 1, characterized in that, The first coil (110) is a positive electrode coil, the second coil is a negative electrode coil, and the first pole tabs (121) formed by cutting the first foils (120) are positive electrode tabs.

4. The manufacturing method of the battery core according to claim 1, characterized in that, Each of the first foils (120) is welded onto the first coil (110) at one time by an ultrasonic welding device or a row welding device.

5. The manufacturing method of the battery core according to claim 2, characterized in that, The first foils (120) are copper foils, nickel foils, or copper-nickel composite foils.

6. The manufacturing method of the battery core according to claim 1, characterized in that, It further includes steps: Before the winding process after the welding process is completed, an insulating adhesive is pasted at the welding joint between the first foils (120) and the first coil (110).

7. The manufacturing method of the battery core according to claim 6, wherein, The insulating adhesive is one or more of PET insulating adhesive paper, PP insulating adhesive paper, and BOPP insulating adhesive paper.

8. The manufacturing method of the battery core according to claim 1, characterized in that, It further includes steps: A finishing process, carried out after the winding process and the cutting process are completed. The finishing process includes pasting a termination adhesive (160) at the tail end of the core (100); A testing process, carried out after the finishing process is completed. The testing process includes performing a short-circuit test on the core (100).

9. A battery, characterized in that, Comprising a core (100), the core (100) being manufactured by the manufacturing method of the battery core according to any one of claims 1 to 8.

10. An electronic device, characterized in that, Comprising the battery according to claim 9.

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