Head-tail misaligned double-sided negative electrode sheet, negative electrode sheet roll and battery cell
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-07-25
- Publication Date
- 2026-08-11
AI Technical Summary
1）由于预设空白偏差位设置于所述第一负极活性层的第二端与所述收尾端之间，且预设空白偏差位用于与负极片卷的相邻的所述头尾错位双面负极片的预设极耳位连通，如此增大了预设极耳位的空间，使增设的预设空白偏差位能为连续生产的负极片的极耳焊接偏差预留偏移位置，以确保负极片卷在完成一轮的连续焊接周期时不会出现负极耳焊接至第一负极活性层（涂覆单元区域）的现象，从而改善了一轮的连续焊接周期过程负极耳焊接至涂覆单元区域的概率，有效地保证了连续焊接质量的同时，还减少了焊接头的磨损概率；同时完成一轮的连续焊接周期后，操作者可以根据实际情况对焊接头的焊接对位进行校正，以便进入下一轮的焊接周期，如此，无需额外增设极耳纠偏装置，既可确保负极耳焊接质量，又能避免负极耳误焊至第一活性层的现象，其操作流程简便且未增加生产成本。
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Figure CN224625546U_ABST
Abstract
Description
Technical Field
[0001] This disclosure relates to the field of negative electrode production technology, and in particular to a double-sided negative electrode with misaligned ends, a negative electrode roll, and a battery cell. Background Technology
[0002] With the continuous development of batteries, people are placing higher demands on their performance. Therefore, bifacial electrode structures have become the preferred design for manufacturing high-performance batteries. A battery consists of bifacial positive and bifacial negative electrodes. In the automated production process of bifacial negative electrodes, a predetermined amount of active material is sequentially coated onto both sides of a current collector to form several coating units. Pre-defined tab positions are formed between each adjacent coating unit. After drying, an electrode roll is obtained. The tabs are then automatically welded to the corresponding pre-defined tab positions, and finally, the sheet is cut to obtain the required bifacial negative electrode. Figure 1 As shown.
[0003] However, during the automatic electrode welding process, the traditional preset electrode position is relatively small (usually around 10mm), and after long-term operation of the automatic welding equipment, alignment deviations between the preset electrode position and the welding station are prone to occur. This deviation will cause the electrode to be mistakenly welded into the coating unit area, which not only makes it difficult to achieve reliable welding and fixation of the electrode, creating the risk of incomplete welding, but also causes the active material of the coating unit to wear down the welding head, significantly shortening the service life of the welding head.
[0004] To address the issue of electrode welding deviation, the traditional approach is to add an electrode correction device, such as Chinese patent document number CN 216227515 U. This not only presents the problem of complex assembly and debugging but also increases production costs. Utility Model Content
[0005] The purpose of this disclosure is to overcome the shortcomings of the prior art and provide a method that can improve the probability of welding the negative electrode tab to the coating unit area in a continuous welding cycle without the need for additional electrode tab correction devices. This effectively ensures the continuous welding quality while reducing the probability of wear on the welding head. The operation process is simple and does not increase production costs. It also facilitates bending, positioning, and internal stress release of the head-tail misaligned double-sided negative electrode sheet, negative electrode sheet roll, and battery cell.
[0006] The purpose of this disclosure is achieved through the following technical solution: A double-sided negative electrode sheet with staggered ends includes a negative electrode current collector, a first negative electrode active layer, a preset tab position, a second negative electrode active layer, and a blank area. The negative electrode current collector has a starting end and a ending end. The first negative electrode active layer and the second negative electrode active layer are respectively disposed on opposite sides of the negative electrode current collector and are staggered. The first end of the first negative electrode active layer forms the preset tab position with the starting end, and the second negative electrode active layer forms the blank area with the starting end. The head-and-tail misaligned double-sided negative electrode sheet also includes a preset blank deviation position, which is located between the second end of the first negative electrode active layer and the tail end; the preset blank deviation position is used to communicate with the preset tab position of the adjacent head-and-tail misaligned double-sided negative electrode sheet of the negative electrode sheet roll.
[0007] In one embodiment, the length of the preset blank deviation position is (0.01-0.02) of the length of the negative electrode current collector.
[0008] In one embodiment, the preset tab position is 8mm-10mm.
[0009] In one embodiment, the length of the blank area is greater than the length of the preset tab position.
[0010] In one embodiment, the length of the blank area is in the ratio of (6.1-6.3):1 to the length of the preset tab position.
[0011] In one embodiment, the length ratio of the first negative electrode active layer to the length of the negative electrode current collector is (0.94-0.96):1; and / or, The length ratio of the first negative electrode active layer to the length of the negative electrode current collector is (0.85-0.90):1; and / or, The thickness of the head-to-tail misaligned double-sided negative electrode sheet is 142µm-144µm.
[0012] In one embodiment, the head-to-tail misaligned double-sided negative electrode sheet further includes a negative electrode tab, which is disposed on the preset tab position and forms a preset gap with the first negative electrode active layer.
[0013] In one embodiment, the preset gap is 2mm-6mm; and / or, The negative electrode tab has a length of 30mm-35mm, a width of 1.5mm-2.1mm, and a thickness of 0.09mm-0.11mm.
[0014] A negative electrode roll includes a plurality of head-to-tail staggered double-sided negative electrode sheets as described in any of the above embodiments, wherein each of the head-to-tail staggered double-sided negative electrode sheets is sequentially connected to form the negative electrode roll.
[0015] A battery cell comprising the head-to-tail misaligned double-sided negative electrode sheet as described in any of the above embodiments.
[0016] Compared with the prior art, this disclosure has at least the following advantages: 1) Since the preset blank deviation position is set between the second end of the first negative electrode active layer and the tail end, and the preset blank deviation position is used to connect with the preset tab position of the adjacent head and tail misaligned double-sided negative electrode sheet of the negative electrode sheet roll, the space of the preset tab position is increased. This allows the added preset blank deviation position to reserve offset position for the tab welding deviation of the negative electrode sheet in continuous production, ensuring that the negative electrode sheet roll will not have the negative tab welded to the first negative electrode active layer (coating unit area) when completing a continuous welding cycle. This improves the probability of the negative electrode tab being welded to the coating unit area during a continuous welding cycle, effectively ensuring the continuous welding quality while reducing the probability of wear of the welding head. At the same time, after completing a continuous welding cycle, the operator can correct the welding alignment of the welding head according to the actual situation so as to enter the next welding cycle. In this way, there is no need to add a tab correction device, which can ensure the welding quality of the negative electrode tab and avoid the phenomenon of the negative electrode tab being mistakenly welded to the first active layer. The operation process is simple and does not increase the production cost.
[0017] 2) Since the first end of the first negative electrode active layer forms the preset tab position with the starting end, and the second negative electrode active layer forms the blank area with the starting end, and since the first negative electrode active layer and the second negative electrode active layer are staggered, the preset blank deviation position is set between the second end of the first negative electrode active layer and the ending end, thereby ensuring that the head and tail of the negative electrode current collector form staggered blank areas, and thus ensuring that the head and tail of the negative electrode current collector retain a single layer of the first negative electrode active layer or the second negative electrode active layer, which is beneficial for bending and positioning during subsequent negative electrode sheet roll welding, and also facilitates the effective release of internal stress during bending, effectively avoiding the problem of deformation of the negative electrode sheet roll. Attached Figure Description
[0018] To more clearly illustrate the technical solutions of the embodiments of this disclosure, the accompanying drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of this disclosure and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.
[0019] Figure 1This is a schematic diagram of the structure of a traditional double-sided negative electrode sheet in one direction. Figure 2 This is a schematic diagram of the structure of a double-sided negative electrode sheet with misaligned head and tail in one direction according to an embodiment of the present invention.
[0020] Reference numerals: 10, double-sided negative electrode with misaligned head and tail; 100, negative electrode current collector; 200, first negative electrode active layer; 300, preset tab position; 400, second negative electrode active layer; 500, blank area; 600, preset blank deviation position; 700, negative electrode tab; 800, preset gap. Detailed Implementation
[0021] To facilitate understanding of this disclosure, a more complete description will be given below with reference to the accompanying drawings, which illustrate preferred embodiments of the present disclosure. However, this disclosure can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure.
[0022] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly attached to the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.
[0023] 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 disclosure belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of this disclosure. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.
[0024] To better understand the technical solutions and beneficial effects of this disclosure, the following detailed description is provided in conjunction with specific embodiments: Please refer to 3. One embodiment of a double-sided negative electrode sheet 10 with staggered head and tail includes a negative electrode current collector 100, a first negative electrode active layer 200, a preset tab position 300, a second negative electrode active layer 400, and a blank area 500. The negative electrode current collector 100 has a starting end and a ending end. The first negative electrode active layer 200 and the second negative electrode active layer 400 are respectively disposed on both sides of the negative electrode current collector 100, and the first negative electrode active layer 200 and the second negative electrode active layer 400 are staggered. The first negative electrode active layer 200... The first end and the starting end form the preset tab position 300, and the second negative electrode active layer 400 and the starting end form the blank area 500, thereby ensuring that the head and tail of the negative electrode current collector 100 form misaligned blank areas, and thus ensuring that the head and tail of the negative electrode current collector 100 retain a single layer of the first negative electrode active layer 200 or the second negative electrode active layer 400, which is beneficial for bending and positioning during subsequent negative electrode sheet welding, and also facilitates the effective release of internal stress during bending, effectively avoiding the problem of deformation of the negative electrode sheet roll.
[0025] It is understood that the head-and-tail misaligned double-sided negative electrode sheet 10 also includes a preset blank deviation position 600, which is located between the second end of the first negative electrode active layer 200 and the tail end. The preset blank deviation position 600 is used to communicate with the preset tab position 300 of the adjacent head-and-tail misaligned double-sided negative electrode sheet 10 of the negative electrode sheet roll. This increases the space of the preset tab position 300, allowing the added preset blank deviation position 600 to reserve an offset position for the tab welding deviation of the continuously produced negative electrode sheet, so as to ensure that the negative electrode sheet roll will not have the negative tab 700 welded to the first negative electrode active layer 200 (coating unit area) when completing a continuous welding cycle. This improves the probability of the negative electrode tab 700 being welded to the coating unit area during a continuous welding cycle, effectively ensuring continuous welding quality while reducing the probability of wear on the welding head. Furthermore, after completing a continuous welding cycle, the operator can correct the welding alignment of the welding head according to the actual situation to ensure that the negative electrode tab 700 and the first negative electrode active layer 200 are within the preset gap 800, thus ensuring the accuracy of the next round of negative electrode tab 700 welding. Therefore, there is no need to add an additional tab correction device, which ensures the welding quality of the negative electrode tab 700 and avoids the phenomenon of the negative electrode tab 700 being mistakenly welded to the first active layer. The operation process is simple and does not increase production costs.
[0026] It should be noted that in the actual process of welding the negative electrode lug 700 to the negative electrode coil, the negative electrode coil needs to be bent and positioned. If traditional methods are used... Figure 1The traditional negative electrode sheet shown (with its tails aligned) causes the space of the preset tab position 300 to shrink after bending and positioning, further increasing the probability of the negative tab 700 being mistakenly soldered to the first active layer. However, this disclosure forms a preset blank deviation position 600 between the second end of the first negative electrode active layer 200 and the tail end. This preset blank deviation position 600 not only provides better internal stress release space when the first active layer is bent, but also increases the space of the preset tab position 300, effectively reducing the probability of the negative tab 700 being mistakenly soldered to the first active layer.
[0027] It is understood that, in one embodiment, if the length of the preset blank deviation position 600 is too long relative to the length of the negative electrode current collector 100, it is impossible to ensure the fabrication of a high-performance head-and-tail misaligned double-sided negative electrode sheet 10; if the length of the preset blank deviation position 600 is too small relative to the length of the negative electrode current collector 100, it is impossible to effectively reduce the probability of the negative electrode tab 700 being welded to the coating unit area during a continuous welding cycle. Therefore, in this disclosure, by setting the length of the preset blank deviation position 600 to the length of the negative electrode current collector 100 to (0.01-0.02), it is ensured that the preset blank deviation position 600 is appropriately distributed along the length of the negative electrode current collector 100. In this way, while ensuring the fabrication of a high-performance head-and-tail misaligned double-sided negative electrode sheet 10, it is also possible to effectively reduce the probability of the negative electrode tab 700 being welded to the coating unit area during a continuous welding cycle.
[0028] In one embodiment, the preset tab position 300 is 8mm-10mm to ensure that the preset tab position 300 is in a suitable position on the negative current collector 100, so as to provide better protection for welding the tab and also ensure the preparation of a high-performance head-tail misaligned double-sided negative electrode sheet 10.
[0029] In one embodiment, the length of the blank area 500 is greater than the length of the preset tab position 300, so as to achieve the staggered setting of the first negative electrode active layer 200 and the second negative electrode active layer 400, so as to ensure that a staggered blank area is formed at the beginning and end of the negative electrode current collector 100.
[0030] like Figure 2 As shown, in one embodiment, the length ratio of the blank area 500 to the length of the preset electrode position 300 is (6.1-6.3):1, to ensure that the length distribution of the blank area 500 and the preset electrode position 300 is more suitable, thereby ensuring that a misaligned blank area is formed at the head and tail of the negative electrode current collector 100.
[0031] like Figure 2As shown, in one embodiment, the length ratio of the first negative electrode active layer 200 to the length of the negative electrode current collector 100 is (0.94-0.96):1; in particular, when the length ratio of the first negative electrode active layer 200 to the length of the negative electrode current collector 100 is (0.85-0.90):1, it ensures the fabrication of a high-performance head-and-tail misaligned double-sided negative electrode sheet 10, while also ensuring the formation of misaligned blank areas at the head and tail of the negative electrode current collector 100.
[0032] In one embodiment, the thickness of the head-to-tail misaligned double-sided negative electrode 10 is 142µm-144µm.
[0033] In one embodiment, the head-to-tail misaligned double-sided negative electrode sheet 10 further includes a negative electrode tab 700, which is disposed on the preset tab position 300 and forms a preset gap 800 with the first negative electrode active layer 200 to achieve welding and fixing of the negative electrode tab 700 and the preset tab position 300.
[0034] like Figure 2 As shown, in one embodiment, the preset gap 800 is 2mm-6mm; in particular, the negative electrode tab 700 has a length of 30mm-35mm, a width of 1.5mm-2.1mm, and a thickness of 0.09mm-0.11mm, to ensure that the negative electrode tab 700 will not be mistakenly welded to the first active layer during a continuous welding cycle, thereby effectively ensuring the welding quality of the negative electrode tab 700 and reducing the probability of wear on the welding head.
[0035] In one embodiment, the negative electrode current collector 100 has a length of 618 mm, the preset tab position 300 has a length of 10 mm, the first negative electrode active layer 200 has a length of 591 mm, the preset blank deviation position 600 has a length of 7 mm, the second negative electrode active layer 400 has a length of 547 mm, and the blank area 500 has a length of 61 mm.
[0036] This disclosure also provides a negative electrode roll, comprising a plurality of head-to-tail staggered double-sided negative electrode sheets 10 as described in any of the above embodiments. Each of the head-to-tail staggered double-sided negative electrode sheets 10 is sequentially connected to form the negative electrode roll, such that adjacent preset blank deviation positions 600 can communicate with preset tab positions 300. This increases the space of the preset tab positions 300, so that the added preset blank deviation positions 600 can reserve offset positions for tab welding deviations of continuously produced negative electrode sheets, ensuring that the negative electrode tabs 700 will not be welded to the first negative electrode active layer 200 (coating unit area) when the negative electrode roll completes a continuous welding cycle.
[0037] In one embodiment, the welding head of the welding equipment for the negative electrode tab 700 forms a preset gap 800 between the projected area of the preset tab position 300 of the single head-to-tail misaligned double-sided negative electrode sheet 10 in the negative electrode sheet roll and the first negative electrode active layer 200 to ensure welding accuracy. Simultaneously, this preset gap 800 also serves as a standard for subsequent correction to ensure the accuracy of the next round of negative electrode tab 700 welding.
[0038] This disclosure also provides a battery cell, including the head-to-tail misaligned double-sided negative electrode 10 as described in any of the above embodiments.
[0039] Compared with the prior art, this disclosure has at least the following advantages: 1) Since the preset blank deviation position 600 is set between the second end of the first negative electrode active layer 200 and the end of the coil, and the preset blank deviation position 600 is used to communicate with the preset tab position 300 of the adjacent head-and-tail misaligned double-sided negative electrode sheet 10 of the negative electrode sheet roll, the space of the preset tab position 300 is increased. This allows the added preset blank deviation position 600 to reserve an offset position for the tab welding deviation of the negative electrode sheet in continuous production, ensuring that the negative electrode sheet roll will not have the tab 700 welded to the first negative electrode active layer 200 (coating unit) when completing a continuous welding cycle. This method improves the probability of the negative electrode tab 700 being welded to the coating unit area during a continuous welding cycle, effectively ensuring continuous welding quality while reducing the probability of wear on the welding head. Furthermore, after completing a continuous welding cycle, the operator can correct the welding alignment of the welding head according to the actual situation to proceed to the next welding cycle. Thus, there is no need to add an additional tab correction device, ensuring the welding quality of the negative electrode tab 700 while preventing it from being mistakenly welded to the first active layer. The operation is simple and does not increase production costs.
[0040] 2) Since the first end of the first negative electrode active layer 200 and the starting end form the preset tab position 300, and the second negative electrode active layer 400 and the starting end form the blank area 500, and since the first negative electrode active layer 200 and the second negative electrode active layer 400 are staggered, the preset blank deviation position 600 is set between the second end of the first negative electrode active layer 200 and the ending end, thereby ensuring that the head and tail of the negative electrode current collector 100 form staggered blank areas, and thus ensuring that the head and tail of the negative electrode current collector 100 retain a single layer of the first negative electrode active layer 200 or the second negative electrode active layer 400, which is beneficial for bending and positioning during subsequent negative electrode sheet roll welding, and also facilitates the effective release of internal stress during bending, effectively avoiding the problem of deformation of the negative electrode sheet roll.
[0041] The embodiments described above are merely illustrative of several implementations of this disclosure, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the disclosed patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this disclosure, and these all fall within the protection scope of this disclosure. Therefore, the protection scope of this patent should be determined by the appended claims.
Claims
1. A double-sided negative electrode sheet with staggered head and tail, comprising a negative electrode current collector, a first negative electrode active layer, a preset tab position, a second negative electrode active layer, and a blank area, wherein the negative electrode current collector has a starting end and a ending end, the first negative electrode active layer and the second negative electrode active layer are respectively disposed on two sides of the negative electrode current collector, and the first negative electrode active layer and the second negative electrode active layer are staggered, the first end of the first negative electrode active layer forms the preset tab position with the starting end, and the second negative electrode active layer forms the blank area with the starting end, characterized in that... The head-and-tail misaligned double-sided negative electrode sheet also includes a preset blank deviation position, which is located between the second end of the first negative electrode active layer and the tail end; the preset blank deviation position is used to communicate with the preset tab position of the adjacent head-and-tail misaligned double-sided negative electrode sheet of the negative electrode sheet roll.
2. The double-sided negative electrode with misaligned head and tail as described in claim 1, characterized in that, The length of the preset blank deviation position is (0.01-0.02) of the length of the negative electrode current collector.
3. The double-sided negative electrode sheet with misaligned head and tail as described in claim 1, characterized in that, The preset electrode position is 8mm-10mm.
4. The double-sided negative electrode with staggered head and tail as described in claim 1, characterized in that, The length of the blank area is greater than the length of the preset electrode position.
5. The double-sided negative electrode sheet with misaligned head and tail as described in claim 1, characterized in that, The ratio of the length of the blank area to the length of the preset electrode position is (6.1-6.3):
1.
6. The double-sided negative electrode sheet with misaligned head and tail as described in claim 1, characterized in that, The length ratio of the first negative electrode active layer to the length of the negative electrode current collector is (0.94-0.96):1; and / or, The length ratio of the first negative electrode active layer to the length of the negative electrode current collector is (0.85-0.90):1; and / or, The thickness of the head-to-tail misaligned double-sided negative electrode sheet is 142μm-144μm.
7. The double-sided negative electrode sheet with misaligned head and tail as described in claim 1, characterized in that, The head-to-tail misaligned double-sided negative electrode sheet also includes a negative electrode tab, which is disposed on the preset tab position and forms a preset gap with the first negative electrode active layer.
8. The double-sided negative electrode sheet with misaligned head and tail as described in claim 7, characterized in that, The preset gap is 2mm-6mm; and / or, The negative electrode tab has a length of 30mm-35mm, a width of 1.5mm-2.1mm, and a thickness of 0.09mm-0.11mm.
9. A negative electrode roll, characterized in that, The invention comprises several head-to-tail misaligned double-sided negative electrode sheets as described in any one of claims 1-8, wherein each of the head-to-tail misaligned double-sided negative electrode sheets is sequentially connected to form the negative electrode sheet roll.
10. A battery cell, characterized in that, The double-sided negative electrode with misaligned head and tail as described in any one of claims 1-8.