Battery cell and method of manufacturing a battery cell

Abstract

The application discloses an electric core and a manufacturing method thereof. The electric core comprises an anode pole piece, a first diaphragm, a cathode pole piece and a second diaphragm, wherein the anode pole piece is aligned at a winding starting end and a winding termination end; the anode pole piece comprises an anode pole piece body and a first adhesive tape; at least one surface of the first end and the second end of the anode pole piece body is pasted with the first adhesive tape in the winding direction, so as to form the winding starting end and the winding termination end of the anode pole piece respectively; the cathode pole piece comprises a cathode pole piece body and a second adhesive tape; at least one surface of the first end and the second end of the cathode pole piece body is pasted with the second adhesive tape in the winding direction, so as to form the winding starting end and the winding termination end of the cathode pole piece; and the first adhesive tape and the second adhesive tape are connected with the first diaphragm and the second diaphragm. The application can realize simultaneous alignment of feeding and cutting, reduces the cutting knife mechanism, improves the production efficiency, and avoids the safety hidden danger.

Description

Technical Field

[0001] This invention relates to the field of battery technology, and more particularly to a battery cell and a method for manufacturing the battery cell. Background Technology

[0002] Lithium-ion batteries, also known as lithium-ion batteries, are a type of rechargeable battery that relies on the movement of lithium ions between the positive and negative electrodes to achieve charging and discharging. With the development of science and technology, lithium batteries have become closely related to people's lives, playing an irreplaceable role in fields such as communications, automobiles, medical care, home appliances, and security.

[0003] The manufacturing process of lithium batteries is relatively long and complex, but it can be roughly divided into three stages: front-end processes (electrode manufacturing), mid-end processes (cell assembly), and back-end processes (formation and packaging). Winding is a crucial step in the mid-end processes. In the winding process of lithium battery production, the separator's role is to separate the cathode and anode electrodes. To achieve insulation and prevent short circuits between the electrodes, the separator needs to have a certain overhang relative to the cathode and anode electrodes.

[0004] Currently, the industry ensures diaphragm overhang by controlling the order in which the diaphragm, anode plate, and cathode plate are fed. Figure 1 As shown, the specific winding process is as follows: the diaphragm is pre-wound 1-2 turns, and then the anode and cathode electrodes are fed in. However, because this method uses a step-by-step feeding method, that is, the diaphragm needs to be cut first, and then the anode and cathode electrodes need to be cut, resulting in a large number of cutting mechanisms, which affects production efficiency and is also prone to powder shedding and / or burrs at the cutting position, posing a safety hazard.

[0005] Therefore, improvements to existing technologies are necessary.

[0006] The above information is provided as background information only to aid in understanding this disclosure and does not constitute an assertion or admission that any of the above content can be used as prior art relative to this disclosure. Summary of the Invention

[0007] This invention provides a battery cell and a battery cell manufacturing method to improve production efficiency and effectively avoid safety hazards caused by powder shedding at the cutting position and / or burrs during the electrode manufacturing process.

[0008] To achieve the above objectives, the present invention provides the following technical solution:

[0009] In a first aspect, the present invention provides a battery cell comprising stacked and wound anode plates, a first separator, a cathode plate, and a second separator; wherein,

[0010] The starting ends of the winding of the anode electrode, the first diaphragm, the cathode electrode, and the second diaphragm are aligned, and the ending ends of the winding are also aligned.

[0011] The anode electrode includes the anode electrode body and the first adhesive tape;

[0012] In the winding direction, at least one surface of the first end of the anode electrode body is adhered with a first adhesive tape to form the winding start end of the anode electrode; at least one surface of the second end of the anode electrode body is adhered with the first adhesive tape to form the winding end end of the anode electrode.

[0013] The cathode electrode consists of a cathode electrode body and a second adhesive tape;

[0014] In the winding direction, at least one surface of the first end of the cathode electrode body is adhered with a second adhesive tape to form the winding start end of the cathode electrode; at least one surface of the second end of the cathode electrode body is adhered with a second adhesive tape to form the winding end end of the cathode electrode.

[0015] The first tape is fused and connected to the first diaphragm and the second diaphragm respectively;

[0016] The second tape is fused and connected to the first diaphragm and the second diaphragm respectively.

[0017] Furthermore, in this battery cell, the length of the second adhesive tape is greater than the length of the first adhesive tape;

[0018] Alternatively, the active material coating area of ​​the anode electrode body is larger than the active material coating area of ​​the cathode electrode body.

[0019] Furthermore, in this battery cell, the first adhesive tape located on the first end of the anode electrode body extends outward from the first end of the anode electrode body;

[0020] The first adhesive tape located on the second end of the anode electrode body extends outward from the second end of the anode electrode body;

[0021] The second adhesive tape located on the first end of the cathode electrode body extends outward from the first end of the cathode electrode body.

[0022] The second adhesive tape located on the second end of the cathode electrode body extends outward from the second end of the cathode electrode body.

[0023] Furthermore, in this battery cell, a first adhesive tape is attached to both opposite surfaces of the first end of the anode electrode body; the two first adhesive tapes located on the opposite surfaces of the first end of the anode electrode body are bonded together.

[0024] The two opposing surfaces of the second end of the anode electrode body are each covered with a first adhesive tape; the two first adhesive tapes located on the opposing surfaces of the second end of the anode electrode body are bonded together.

[0025] A second adhesive tape is attached to both opposite surfaces of the first end of the cathode electrode body; the two second adhesive tapes located on the opposite surfaces of the first end of the cathode electrode body are bonded together.

[0026] A second adhesive tape is attached to both opposite surfaces of the second end of the cathode electrode body; the two second adhesive tapes located on opposite surfaces of the second end of the cathode electrode body are bonded together.

[0027] Furthermore, in this battery cell, both the first tape and the second tape include a substrate, and one surface of the substrate is divided into a first region and a second region.

[0028] The first area has an adhesive layer.

[0029] Furthermore, in this battery cell, the second region protrudes outward to form a protrusion.

[0030] Furthermore, in this battery cell, both the first tape and the second tape include a substrate, and the substrate includes a first segment and a second segment connected in sequence.

[0031] The end face of the first segment is recessed inward to form a connecting groove;

[0032] An adhesive layer is provided on the inner wall of the connecting groove.

[0033] Furthermore, in this battery cell, the adhesive layer is a sprayed gel-like adhesive.

[0034] Furthermore, in this battery cell, the substrate is made of the same material as the first diaphragm and the second diaphragm.

[0035] In a second aspect, the present invention provides a method for manufacturing a battery cell, for manufacturing a battery cell as mentioned in the first aspect above, comprising:

[0036] Before winding, the unwound cathode electrode body and anode electrode body are cut, and the lengths of the cut cathode electrode body and anode electrode body are the same.

[0037] The cut anode electrode body is pulled apart from the uncut anode electrode body at the cut position, and a third adhesive tape is attached to at least one surface of the anode electrode body after pulling apart, so that the cut anode electrode body and the uncut anode electrode body continue to be connected as one unit; and the cut cathode electrode body is pulled apart from the uncut cathode electrode body at the cut position, and a fourth adhesive tape is attached to at least one surface of the cathode electrode body after pulling apart, so that the cut cathode electrode body and the uncut cathode electrode body continue to be connected as one unit; wherein, the third adhesive tape is cut to obtain two first adhesive tapes, and the fourth adhesive tape is cut to obtain two second adhesive tapes;

[0038] During winding, the anode sheet, the first diaphragm, the cathode sheet, and the second diaphragm are aligned and fed into the material before winding. A second cut is then made at the positions of the third and fourth tapes to obtain the wound battery cell.

[0039] Furthermore, in this battery cell manufacturing method, during winding, the anode electrode, the first diaphragm, the cathode electrode, and the second diaphragm are aligned and fed into the material before winding, and a second cut is performed at the positions of the third and fourth adhesive tapes to obtain the wound battery cell. The steps include:

[0040] During winding, the anode sheet, the first diaphragm, the cathode sheet, and the second diaphragm are aligned and fed into the material before winding.

[0041] A hot cutter is used to make secondary cuts at the positions of the third and fourth tapes. The first tape obtained after cutting is fused and connected to the first and second diaphragms respectively, and the second tape is fused and connected to the first and second diaphragms respectively, to obtain a wound battery cell.

[0042] Compared with the prior art, the present invention has the following beneficial effects:

[0043] The present invention provides a battery cell and a battery cell manufacturing method. By attaching a first adhesive tape to at least one surface at both ends of the anode electrode body to form an anode electrode, and attaching a second adhesive tape to at least one surface at both ends of the cathode electrode body to form a cathode electrode, the starting ends of the anode electrode, the first diaphragm, the cathode electrode, and the second diaphragm can be aligned during winding, and the ending ends of the winding can also be aligned. This enables simultaneous alignment of the feed material and simultaneous cutting and finishing, which not only reduces the number of cutting mechanisms and improves production efficiency, but also prevents powder shedding and / or burrs at the cutting position during cutting, effectively avoiding safety hazards.

[0044] The present invention has other features and advantages, which will be apparent from or will be set forth in detail in the accompanying drawings and the following detailed description, which together serve to explain the particular principles of the invention. Attached Figure Description

[0045] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0046] Figure 1 This is a schematic diagram of the existing technology of sequential feeding and winding of battery cells;

[0047] Figure 2 This is a schematic diagram of the battery cell structure provided in Embodiment 1 of the present invention;

[0048] Figure 3 This is a schematic diagram of the structure provided in Embodiment 1 of the present invention, in which the first tape and the second tape are fused and connected to the first diaphragm and the second diaphragm after the battery cell is wound.

[0049] Figure 4 This is a schematic diagram of the battery cell before it is wound, according to Embodiment 1 of the present invention;

[0050] Figure 5 This is a side view schematic diagram of the structure of the first tape and the second tape provided in Embodiment 1 of the present invention;

[0051] Figure 6 This is a top view schematic diagram of the structure of the first tape and the second tape provided in Embodiment 1 of the present invention;

[0052] Figure 7 This is a side view schematic diagram of the structure of the first tape and the second tape provided in Embodiment 1 of the present invention;

[0053] Figure 8 This is a side view schematic diagram of the structure of the first tape and the second tape provided in Embodiment 1 of the present invention;

[0054] Figure 9 This is a schematic flowchart of a battery cell manufacturing method provided in Embodiment 2 of the present invention;

[0055] Figure 10 This is a schematic diagram of the structure provided in Embodiment 2 of the present invention, in which the anode electrode and the cathode electrode are cut once and then connected together as a whole by the first tape and the second tape respectively;

[0056] Figure 11 This is a side view of the structure of two symmetrical first tapes 12 or second tapes 32 before secondary cutting, provided in Embodiment 2 of the present invention.

[0057] Figure 12 This is a top view of the structure of two symmetrical first tapes 12 or second tapes 32 before secondary cutting, provided in Embodiment 2 of the present invention.

[0058] Figure 13 This is a schematic diagram of the structure provided in Embodiment 2 of the present invention, in which the anode sheet, the first diaphragm, the cathode sheet, and the second diaphragm are aligned and fed into the material and then wound on a winding needle.

[0059] Figure label:

[0060] Anode 1, first diaphragm 2, cathode 3, second diaphragm 4;

[0061] Anode electrode body 11, first adhesive tape 12;

[0062] Cathode electrode body 31, second adhesive tape 32;

[0063] Substrate 121, protrusion 122, adhesive layer 123. Detailed Implementation

[0064] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application. Furthermore, those skilled in the art will understand that with technological development and the emergence of new scenarios, the technical solutions provided by the embodiments of this application are also applicable to similar technical problems.

[0065] In the description of this application, it should be understood that, unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. Furthermore, any terminology used is for the purpose of describing particular embodiments only and is not intended to be limiting of this application.

[0066] Furthermore, to better illustrate this application, numerous specific details are provided in the following detailed embodiments. Those skilled in the art should understand that this application can be implemented without certain specific details. In some instances, methods, means, components, and circuits well-known to those skilled in the art have not been described in detail in order to highlight the main points of this application.

[0067] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0068] Example 1

[0069] In view of the aforementioned deficiencies in existing battery cell manufacturing technologies, the applicant, based on years of extensive practical experience and professional knowledge in the design and manufacture of such products, and in conjunction with the application of theoretical principles, has actively conducted research and innovation in order to create a technology that can overcome the deficiencies of existing technologies and make battery cell manufacturing technology more practical. After continuous research, design, and repeated prototype production and improvement, this invention, which has real practical value, has finally been created.

[0070] Please refer to Figure 2-8 This invention provides a battery cell comprising stacked and wound anode plate 1 (also called negative electrode plate), a first separator 2, a cathode plate 3 (also called positive electrode plate) and a second separator 4; wherein,

[0071] The starting ends of the winding of the anode electrode 1, the first diaphragm 2, the cathode electrode 3, and the second diaphragm 4 are aligned, and the ending ends of the winding are also aligned.

[0072] The anode electrode 1 includes an anode electrode body 11 and a first adhesive tape 12;

[0073] In the winding direction, at least one surface of the first end of the anode electrode body 11 is attached with a first adhesive tape 12 to form the winding start end of the anode electrode 1; at least one surface of the second end of the anode electrode body 11 is attached with a first adhesive tape 12 to form the winding end of the anode electrode 1; this embodiment is illustrated with the example that the first adhesive tape 12 is attached to both opposite surfaces of the first end and the second end of the anode electrode body 11.

[0074] The cathode electrode 3 includes a cathode electrode body 31 and a second adhesive tape 32;

[0075] In the winding direction, at least one surface of the first end of the cathode electrode body 31 is attached with a second adhesive tape 32 to form the winding start end of the cathode electrode 3; at least one surface of the second end of the cathode electrode body 31 is attached with a second adhesive tape 32 to form the winding end of the cathode electrode 3; this embodiment is illustrated with the example that the first end and the second end of the cathode electrode body 31 are each attached with a second adhesive tape 32 on both opposite surfaces.

[0076] The first adhesive tape 12 is fused to the first diaphragm 2 and the second diaphragm 4 respectively; the second adhesive tape 32 is fused to the first diaphragm 2 and the second diaphragm 4 respectively, and the fused state is as follows. Figure 3 As shown.

[0077] It should be noted that the first end and the second end in this embodiment are relative concepts and do not refer to a specific end. That is, any electrode body has two free ends. If one of the two free ends is called the first end, then the other is called the second end, and so on. In addition, the winding direction refers to the direction from the first end to the middle section and then to the second end. If the first end is the winding start end and the second end is the winding end end, then the winding direction refers to the direction from the winding start end to the middle section and then to the winding end end.

[0078] To address the issue of low production efficiency caused by the separate feeding of electrodes and diaphragms in existing technologies, which results in numerous cutting mechanisms, this embodiment proposes a scheme for simultaneous feeding and finishing of the anode electrode 1, the first diaphragm 2, the cathode electrode 3, and the second diaphragm 4. This allows for the simultaneous cutting of the anode electrode 1, the first diaphragm 2, the cathode electrode 3, and the second diaphragm 4 by a single cutting blade (a hot cutting blade with a temperature of 140-300℃, employing a follow-up cutting method). This reduces the number of cutting mechanisms, increases the lifespan of the cutting blade, and improves production efficiency. The specific method is as follows: First, a first adhesive tape 12 is attached to at least one surface at both ends of the anode electrode body 11 to form the anode electrode 1. Then, a second adhesive tape 32 is attached to at least one surface at both ends of the cathode electrode body 31 to form the cathode electrode 3. In this way, it can be ensured that even if the anode electrode 1, the first diaphragm 2, the cathode electrode 3, and the second diaphragm 4 are simultaneously aligned and fed into the circuit, the first adhesive tape 12 and the second adhesive tape 32 can still ensure that the first diaphragm 2 and the second diaphragm 4 have overhang specifications relative to the anode electrode 1 and the cathode electrode 3. Thus, during winding, the starting ends of the winding of the anode electrode 1, the first diaphragm 2, the cathode electrode 3, and the second diaphragm 4 can be aligned and fed into the circuit, eliminating the need for separate feeding as in the prior art. Moreover, the ending ends of the winding of the anode electrode 1, the first diaphragm 2, the cathode electrode 3, and the second diaphragm 4 can also be aligned and cut to finish the circuit. Therefore, there will be no powder falling off the cutting position and / or burrs during cutting, which can effectively avoid safety hazards.

[0079] It is understood that the anode electrode body 11 is provided with an anode tab, which can be a single tab, multiple tabs or a full tab, and the anode electrode body 11 is coated with an anode active coating; the cathode electrode body 31 is provided with a cathode tab, which can also be a single tab, multiple tabs or a full tab, and the cathode electrode body 31 is coated with a cathode active coating.

[0080] In the winding process of battery production, in addition to the overhang requirements of the first separator 2 and the second separator 4 relative to the anode electrode 1 and the cathode electrode 3, the anode electrode 1 also needs to have an overhang requirement relative to the cathode electrode 3. To meet this requirement, one approach is to design the active material (i.e., anode active coating) coating area of ​​the anode electrode body 11 to be larger than the active material (i.e., cathode active coating) coating area of ​​the cathode electrode body 31. Another approach is to design the length of the second adhesive tape 32 to be greater than the length of the first adhesive tape 12.

[0081] For example, the length of the first tape 12 may be 5-10 mm shorter than the length of the second tape 32.

[0082] In addition, although in this embodiment Figure 2-4The illustration shows the first diaphragm 2, the anode electrode 1, the second diaphragm 4, and the cathode electrode 3 stacked and wound in sequence. However, it can also be the first diaphragm 2, the cathode electrode 3, the second diaphragm 4, and the anode electrode 1 stacked and wound in sequence. That is, as long as a diaphragm (which could be the first diaphragm 2 or the second diaphragm 4) is always provided between the anode electrode 1 and the cathode electrode 3 in the wound cell, it is acceptable.

[0083] Please refer to this again. Figure 2-4 In this embodiment, the first tape 12 located on the first end of the anode electrode body 11 extends outward from the first end of the anode electrode body 11.

[0084] The first adhesive tape 12 located on the second end of the anode electrode body 11 extends outward from the second end of the anode electrode body 11;

[0085] The second adhesive tape 32 located on the first end of the cathode electrode body 31 extends outward from the first end of the cathode electrode body 31.

[0086] The second adhesive tape 32 located on the second end of the cathode electrode body 31 extends outward from the second end of the cathode electrode body 31.

[0087] It should be noted that only a portion of the first adhesive tape 12 located on the first end of the anode electrode body 11 is attached to the first end of the anode electrode body 11, while the other portion extends outward relative to the first end of the anode electrode body 11 along its length. Thus, when the winding start end of the anode electrode 1 is aligned with the winding start ends of the first diaphragm 2, the cathode electrode 3, and the second diaphragm 4, it is actually the outward-extending portion of the first adhesive tape 12 that forms the winding start end of the anode electrode 1 and aligns with the winding start ends of the first diaphragm 2, the cathode electrode 3, and the second diaphragm 4.

[0088] Similarly, only a portion of the first adhesive tape 12 located on the second end of the anode electrode body 11 is attached to the second end of the anode electrode body 11, while the other portion extends outward relative to the second end of the anode electrode body 11 along its length. Thus, when the winding termination end of the anode electrode 1 is aligned with the winding termination ends of the first diaphragm 2, the cathode electrode 3, and the second diaphragm 4, it is actually the outward-extending portion of the first adhesive tape 12 that forms the winding termination end of the anode electrode 1 and aligns with the winding termination ends of the first diaphragm 2, the cathode electrode 3, and the second diaphragm 4.

[0089] Similarly, only a portion of the second adhesive tape 32 located on the first end of the cathode electrode body 31 is attached to the first end of the cathode electrode body 31, while the other portion extends outward relative to the first end of the cathode electrode body 31 along its length. Thus, when the winding start end of the cathode electrode 3 is aligned with the winding start ends of the first diaphragm 2, the anode electrode 1, and the second diaphragm 4, it is actually the outward-extending portion of the second adhesive tape 32 that forms the winding start end of the cathode electrode 3 and aligns with the winding start ends of the first diaphragm 2, the anode electrode 1, and the second diaphragm 4.

[0090] Similarly, only a portion of the second adhesive tape 32 located on the second end of the cathode electrode body 31 is attached to the second end of the cathode electrode body 31, while the other portion extends outward relative to the second end of the cathode electrode body 31 along its length. Thus, when the winding termination end of the cathode electrode 3 is aligned with the winding termination ends of the first diaphragm 2, the anode electrode 1, and the second diaphragm 4, it is actually the outward-extending portion of the second adhesive tape 32 that forms the winding termination end of the cathode electrode 3 and aligns with the winding termination ends of the first diaphragm 2, the anode electrode 1, and the second diaphragm 4.

[0091] Please refer to this again. Figure 2-4 In this embodiment, when the first tape 12 is pasted on both opposite surfaces of the first end of the anode electrode body 11, the two first tapes 12 on the opposite surfaces of the first end of the anode electrode body 11 are bonded together.

[0092] When the first adhesive tape 12 is pasted on both opposite surfaces of the second end of the anode electrode body 11, the two first adhesive tapes 12 on the opposite surfaces of the second end of the anode electrode body 11 are bonded together.

[0093] When the two opposing surfaces of the first end of the cathode electrode body 31 are both covered with the second adhesive tape 32, the two second adhesive tapes 32 on the opposing surfaces of the first end of the cathode electrode body 31 are bonded together.

[0094] When the two opposing surfaces of the first end of the cathode electrode body 31 are both covered with the second adhesive tape 32, the two second adhesive tapes 32 on the opposing surfaces of the second end of the cathode electrode body 31 are bonded together.

[0095] It should be noted that, since both opposite surfaces of the anode electrode body 11 (whether at the first or second end) are covered with first adhesive tape 12, and both first adhesive tapes 12 on the opposite surfaces of the anode electrode body 11 have portions extending outward relative to the ends of the anode electrode body 11, when cut with a cutter, the two first adhesive tapes 12 on the opposite surfaces of the anode electrode body 11 will... Figure 4The parts shown at point a (i.e., the outward-extending portion) are glued together, and the result is as follows: Figure 2 As shown.

[0096] Similarly, since the two opposing surfaces of the cathode electrode body 31 (both the first and second ends) are covered with second adhesive tape 32, and both second adhesive tapes 32 on the opposing surfaces of the cathode electrode body 31 have portions extending outward relative to the ends of the cathode electrode body 31, when cut with a cutter, the two second adhesive tapes 32 on the opposing surfaces of the cathode electrode body 31 will... Figure 4 The parts shown at point b (i.e., the outward-extending portion) are glued together, and the result is as follows: Figure 2 As shown.

[0097] In this embodiment, there are many different ways to implement the structural design of the first tape 12 and the second tape 32. The following embodiment will use two of them as examples for illustration and corresponding text description.

[0098] Please refer to this again. Figure 5-6 In the first embodiment, both the first tape 12 and the second tape 32 include a substrate 121, and one surface of the substrate 121 is divided into a first region and a second region.

[0099] The first region is provided with an adhesive layer 123, which is connected to the substrate 121.

[0100] In this embodiment, further, in Figure 5-6 On the basis of, such as Figure 7 As shown, the second region can also protrude outward to form a protrusion 122, and the adhesive layer 123 is also connected to the protrusion 122.

[0101] It should be noted that, with Figure 7 Taking the illustrated structural design as an example, the protrusion 122 is formed by the outward protrusion of the substrate 121. Therefore, the substrate 121 and the protrusion 122 are made of the same material, and neither of them is adhesive. However, the adhesive layer 123 is not only made of a different material than the substrate 121 and the protrusion 122, but it is also adhesive. Figure 7 As shown, viewed from the side, the substrate 121 and the protrusion 122 form a flat "L" shape, while the adhesive layer 123 is a separate "I" shape. Since one of the two opposing surfaces of the adhesive layer 123 is already bonded to the substrate 121, while the other surface remains exposed to air, both the first tape 12 and the second tape 32 are single-sided adhesive tapes, and this adhesive side ultimately needs to be bonded to the end of the electrode.

[0102] In addition, in order to ensure that the two adhesive tapes on the opposite surfaces of the electrode end can be bonded together, only a portion of the surface of the adhesive layer 123 exposed to air is bonded to the end of the electrode, while the other portion continues to be exposed to air.

[0103] In this embodiment, the length of the protrusion 122 in the length direction of the first tape 12 and the second tape 32 can be 2.5-5mm, and the length of the adhesive layer 123 can be 5-15mm.

[0104] Understandably, all of the above parameters can be adjusted according to specific circumstances to achieve the best results.

[0105] Please refer to this again. Figure 8 In the second embodiment, both the first tape 12 and the second tape 32 include a substrate 121, and the substrate 121 includes a first segment and a second segment connected in sequence.

[0106] The end face of the first segment is recessed inward to form a connecting groove;

[0107] An adhesive layer 123 is provided on the inner wall of the connecting groove.

[0108] It should be noted that the function of the connecting groove is to connect the substrate 121 and the electrode. That is, when the electrode is placed in the connecting groove, the adhesive layer 123 on the inner wall of the connecting groove can be bonded to the electrode, thereby realizing the connection between the two.

[0109] It is understood that the description of the materials of the substrate 121 and the adhesive layer 123 in this embodiment is the same as that in the first embodiment.

[0110] In this embodiment, the substrate 121 and the protrusion 122 are made of the same material as the first diaphragm 2 and the second diaphragm 4.

[0111] It should be noted that the substrate 121 and the protrusion 122 can be made of one or a combination of PP (Polypropylene) and PE (Polyethylene), and the first diaphragm 2 and the second diaphragm 4 can also be made of one or a combination of PP and PE. That is, the substrate 121 and the protrusion 122 are made of the same material as the first diaphragm 2 and the second diaphragm 4. The purpose of this design is that after the cutter has cut the anode plate 1, the first diaphragm 2, the cathode plate 3, and the second diaphragm 4, the substrate 121 and the protrusion 122 can be fused and connected with the first diaphragm 2 and the second diaphragm 4 to complete the process and avoid a short circuit between the cathode plate 3 and the anode plate 1.

[0112] In this embodiment, the adhesive layer 123 is a sprayed gel-like adhesive.

[0113] It should be noted that the gel-like adhesive used for spraying can be, for example, epoxy acrylate, which allows lithium ions to pass through but not electrons.

[0114] In this embodiment, the thickness of the first tape 12 and the second tape 32 can be 0.01-2mm.

[0115] Understandably, all of the above parameters can be adjusted according to specific circumstances to achieve the best results.

[0116] Although this application frequently uses terms such as anode plate, first diaphragm, cathode plate, and second diaphragm, the possibility of using other terms is not excluded. These terms are used merely for the convenience of describing and explaining the essence of the invention; interpreting them as any additional limitation would contradict the spirit of the invention.

[0117] The present invention provides a battery cell in which a first adhesive tape is attached to at least one surface at both ends of the anode electrode body to form an anode electrode, and a second adhesive tape is attached to at least one surface at both ends of the cathode electrode body to form a cathode electrode. This allows the starting ends of the anode electrode, the first diaphragm, the cathode electrode, and the second diaphragm to be aligned during winding, and the ending ends of the winding to be aligned as well. This enables simultaneous alignment of the feed material and simultaneous cutting and finishing, which not only reduces the number of cutting mechanisms and improves production efficiency, but also prevents powder shedding and / or burrs at the cutting position during cutting, effectively avoiding safety hazards.

[0118] Example 2

[0119] Please refer to Figure 9 This invention provides a method for manufacturing battery cells, applicable to scenarios where battery cells are manufactured by winding, and for manufacturing battery cells as mentioned in Embodiment 1 above. This method can be implemented by software and / or hardware. Specifically, the method includes the following steps:

[0120] S201. Before winding, the unwound cathode electrode body and anode electrode body are cut, and the lengths of the cut cathode electrode body and anode electrode body are the same.

[0121] It should be noted that, before winding, this embodiment will cut the unwound cathode electrode body 31 and anode electrode body 11 once. Before the first cut, the cathode electrode body 31 and anode electrode body 11 will be identified and positioned according to the Mark holes on them used to mark the cut positions of the electrode bodies. The Mark holes are generally rectangular, but can also be elliptical or U-shaped.

[0122] S202, the cut anode electrode body is separated from the uncut anode electrode body at the cut position, and a third adhesive tape is pasted on at least one surface of the anode electrode body after separation, so that the cut anode electrode body and the uncut anode electrode body continue to be connected as one unit; and the cut cathode electrode body is separated from the uncut cathode electrode body at the cut position, and a fourth adhesive tape is pasted on at least one surface of the cathode electrode body after separation, so that the cut cathode electrode body and the uncut cathode electrode body continue to be connected as one unit; wherein, the third adhesive tape is cut to obtain two first adhesive tapes, and the fourth adhesive tape is cut to obtain two second adhesive tapes.

[0123] It should be noted that the schematic diagram shows how the anode electrode body 11, after being cut once, and the uncut anode electrode body 11 are connected together by tape after being separated by a distance. Figure 10 As shown in the diagram, the cathode electrode body 31 after one cut is connected to the uncut cathode electrode body 31 by tape after being separated by a distance. Figure 10 As shown.

[0124] Understandably, with Figure 7 Taking the illustrated structural design as an example, the third and fourth adhesive tapes used to connect the first-cut electrode body to the uncut electrode body after the distance is increased are, before the second cutting, as shown in the example. Figure 11-12 As shown, it consists of two symmetrical first adhesive tapes 12 or second adhesive tapes 32. This allows for the formation of a shape like this on each electrode body after a second cut (the second cut is located at the center of symmetry). Figure 7 The first tape 12 or the second tape 32 shown.

[0125] In addition, in order to ensure that the anode electrode 1 also has the same overhang specification requirements as the cathode electrode 3, either when selecting the anode electrode 1 and the cathode electrode 3, the active material coating area of ​​the anode electrode body 11 is designed to be larger than the active material coating area of ​​the cathode electrode body 31, or in this step, the length of the second tape 32 is designed to be greater than the length of the first tape 12.

[0126] S203. During winding, the anode electrode, the first diaphragm, the cathode electrode, and the second diaphragm are aligned and fed into the material and then wound. A second cut is made at the positions of the first tape and the second tape to obtain the wound battery cell.

[0127] It should be noted that after the anode plate 1, the first diaphragm 2, the cathode plate 3, and the second diaphragm 4 are aligned and fed into the feed, the winding process on the winding needle is as follows: Figure 13 As shown.

[0128] In this step, the end position of the cell winding can be determined by the length counting mechanism and the Mark hole recognition mechanism. At the end of winding, a cutter is used to simultaneously cut the anode plate 1, the first diaphragm 2, the cathode plate 3, and the second diaphragm 4, thus obtaining the desired result. Figure 2 The image shows a wound battery cell.

[0129] In this embodiment, step S203 can be further refined to include the following steps:

[0130] During winding, the anode sheet, the first diaphragm, the cathode sheet, and the second diaphragm are aligned and fed into the material before winding.

[0131] A hot cutter is used to make secondary cuts at the positions of the third and fourth tapes. The first tape obtained after cutting is fused and connected to the first and second diaphragms respectively, and the second tape is fused and connected to the first and second diaphragms respectively, to obtain a wound battery cell.

[0132] It should be noted that, because a hot cutting blade is used, not only can the third and fourth tapes be cut, but the first and second tapes can also be thermally fused together with the first and second diaphragms because they are made of the same material, thus completing the finishing process.

[0133] The present invention provides a battery cell manufacturing method, which forms an anode electrode by attaching a first adhesive tape to at least one surface at both ends of the anode electrode body, and forms a cathode electrode by attaching a second adhesive tape to at least one surface at both ends of the cathode electrode body. This allows the starting ends of the anode electrode, the first diaphragm, the cathode electrode, and the second diaphragm to be aligned during winding, and the ending ends of the winding to be aligned as well. This enables simultaneous alignment of the feed material and simultaneous cutting and finishing, which not only reduces the number of cutting mechanisms and improves production efficiency, but also prevents powder shedding and / or burrs at the cutting position during cutting, effectively avoiding safety hazards.

[0134] In summary, after reading this detailed disclosure, those skilled in the art will understand that the foregoing detailed disclosure is presented by way of example only and is not restrictive. Although not explicitly stated herein, those skilled in the art will understand that this application is intended to encompass various reasonable changes, improvements, and modifications to the embodiments. These changes, improvements, and modifications are intended to be made by this application and are within the spirit and scope of the exemplary embodiments of this application.

[0135] Furthermore, certain terms used in this application have been used to describe embodiments of this application. For example, "an embodiment," "an embodiment," and / or "some embodiments" mean that a particular feature, structure, or characteristic described in connection with that embodiment may be included in at least one embodiment of this application. Therefore, it is to be emphasized and understood that two or more references to "an embodiment" or "an embodiment" or "an alternative embodiment" in various parts of this specification do not necessarily refer to the same embodiment. Moreover, specific features, structures, or characteristics may be appropriately combined in one or more embodiments of this application.

[0136] It should be understood that in the foregoing description of the embodiments of this application, various features are combined in a single embodiment, drawing, or description for the purpose of simplifying the understanding of a feature. However, this does not mean that the combination of these features is necessary, and those skilled in the art may extract some features as separate embodiments when reading this application. That is, the embodiments in this application can also be understood as an integration of multiple sub-embodiments. It is also valid when the content of each sub-embodiment contains fewer than all the features of a single foregoing disclosed embodiment.

[0137] Finally, it should be understood that the embodiments disclosed herein are illustrative of the principles of the embodiments of this application. Other modified embodiments are also within the scope of this application. Therefore, the embodiments disclosed herein are merely examples and not limitations. Those skilled in the art can adopt alternative configurations to implement the applications in this application based on the embodiments in this application. Therefore, the embodiments of this application are not limited to the embodiments precisely described in the application.

Claims

1. A battery cell, characterized in that, It includes a stacked and wound anode sheet (1), a first diaphragm (2), a cathode sheet (3), and a second diaphragm (4); wherein, The starting ends of the winding of the anode electrode (1), the first diaphragm (2), the cathode electrode (3), and the second diaphragm (4) are aligned, and the ending ends of the winding are also aligned. The anode electrode (1) includes an anode electrode body (11) and a first adhesive tape (12); In the winding direction, at least one surface of the first end of the anode electrode body (11) is attached with the first tape (12) to form the winding start end of the anode electrode (1); at least one surface of the second end of the anode electrode body (11) is attached with the first tape (12) to form the winding end of the anode electrode (1). The cathode electrode (3) includes a cathode electrode body (31) and a second adhesive tape (32); In the winding direction, at least one surface of the first end of the cathode electrode body (31) is attached with the second adhesive tape (32) to form the winding start end of the cathode electrode (3); at least one surface of the second end of the cathode electrode body (31) is attached with the second adhesive tape (32) to form the winding end of the cathode electrode (3). The first tape (12) is fused to the first diaphragm (2) and the second diaphragm (4) respectively; The second tape (32) is fused and connected to the first diaphragm (2) and the second diaphragm (4) respectively.

2. The battery cell according to claim 1, characterized in that, The length of the second tape (32) is greater than the length of the first tape (12); Alternatively, the active material coating area of ​​the anode electrode body (11) is larger than the active material coating area of ​​the cathode electrode body (31).

3. The battery cell according to claim 1, characterized in that, The first tape (12) located on the first end of the anode electrode body (11) extends outward from the first end of the anode electrode body (11); The first tape (12) located on the second end of the anode electrode body (11) extends outward from the second end of the anode electrode body (11); The second tape (32) located on the first end of the cathode electrode body (31) extends outward from the first end of the cathode electrode body (31); The second tape (32) located on the second end of the cathode electrode body (31) extends outward from the second end of the cathode electrode body (31).

4. The battery cell according to claim 1, characterized in that, The first tape (12) is attached to both opposite surfaces of the first end of the anode electrode body (11); the two first tapes (12) located on the opposite surfaces of the first end of the anode electrode body (11) are bonded together. The first tape (12) is attached to both opposite surfaces of the second end of the anode electrode body (11); the two first tapes (12) located on the opposite surfaces of the second end of the anode electrode body (11) are bonded together; The second adhesive tape (32) is attached to both opposite surfaces of the first end of the cathode electrode body (31); the two second adhesive tapes (32) located on the opposite surfaces of the first end of the cathode electrode body (31) are bonded together; The second adhesive tape (32) is attached to both opposite surfaces of the second end of the cathode electrode body (31); the two second adhesive tapes (32) located on the opposite surfaces of the second end of the cathode electrode body (31) are bonded together.

5. The battery cell according to claim 1, characterized in that, Both the first tape (12) and the second tape (32) include a substrate (121), and one surface of the substrate (121) is divided into a first region and a second region; The first region is provided with an adhesive layer (123).

6. The battery cell according to claim 5, characterized in that, The second region protrudes outward to form a protrusion (122).

7. The battery cell according to claim 1, characterized in that, Both the first tape (12) and the second tape (32) include a substrate (121), which includes a first segment and a second segment connected in sequence. The end face of the first segment is recessed inward to form a connecting groove; The inner wall of the connecting groove is provided with an adhesive layer (123).

8. The battery cell according to claim 5 or 7, characterized in that, The adhesive layer (123) is a sprayed gel-state adhesive.

9. The battery cell according to claim 5 or 7, characterized in that, The substrate (121) is made of the same material as the first diaphragm (2) and the second diaphragm (4).

10. A method for manufacturing a battery cell, used to manufacture a battery cell as described in any one of claims 1-9, characterized in that, include: Before winding, the unwound cathode electrode body and anode electrode body are cut, and the lengths of the cut cathode electrode body and anode electrode body are the same. The cut anode electrode body is pulled apart from the uncut anode electrode body at the cut position, and a third adhesive tape is attached to at least one surface of the anode electrode body after pulling it apart, so that the cut anode electrode body and the uncut anode electrode body continue to be connected as one unit. The cut cathode electrode body is separated from the uncut cathode electrode body at the cut position, and a fourth adhesive tape is pasted on at least one surface of the cathode electrode body after separation, so that the cut cathode electrode body and the uncut cathode electrode body continue to be connected as one unit; wherein, the third adhesive tape is cut to obtain two first adhesive tapes, and the fourth adhesive tape is cut to obtain two second adhesive tapes; During winding, the anode sheet, the first diaphragm, the cathode sheet, and the second diaphragm are aligned and fed into the material before winding. A second cut is then made at the positions of the third and fourth tapes to obtain the wound battery cell.

11. The cell manufacturing method according to claim 10, characterized in that, The steps of aligning and winding the anode sheet, the first diaphragm, the cathode sheet, and the second diaphragm, and then performing secondary cutting at the positions of the third and fourth adhesive tapes to obtain the wound battery cell include: During winding, the anode sheet, the first diaphragm, the cathode sheet, and the second diaphragm are aligned and fed into the material before winding. A hot cutter is used to make secondary cuts at the positions of the third and fourth tapes. The first tape obtained after cutting is fused to the first diaphragm and the second diaphragm respectively, and the second tape is fused to the first diaphragm and the second diaphragm respectively, to obtain a wound battery cell.

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