Novel multi-pole ear free-flattening structure with different sizes of inner and outer rings in battery cell and semi-solid cylindrical battery

Abstract

This disclosure provides a novel multi-tab non-bending flattening structure for a battery cell with different inner and outer ring dimensions, and a semi-solid cylindrical battery. The novel multi-tab non-bending flattening structure for a battery cell with different inner and outer ring dimensions includes a positive electrode sheet, a separator, and a negative electrode sheet stacked and wound sequentially. One side of the positive electrode sheet has multiple spaced-apart positive tabs along its length. The height and width of the multiple positive tabs increase sequentially along the winding direction of the positive electrode sheet, so that the inwardly bent ends of the multiple positive tabs are flush. The negative electrode sheet has multiple spaced-apart negative tabs along its length on the side away from the positive tabs. The height and width of the multiple negative tabs increase sequentially along the winding direction of the negative electrode sheet, so that the inwardly bent ends of the multiple negative tabs are flush.

Description

Technical Field

[0001] This disclosure relates to the field of semi-solid batteries, and in particular to a novel multi-tab flattening structure with different sizes of inner and outer rings in a cell, and a semi-solid cylindrical battery. Background Technology

[0002] Semi-solid-state batteries primarily use solid materials to replace the liquid or gel-like electrolytes found in existing lithium-ion batteries. Compared to batteries with liquid electrolytes, they offer advantages such as higher energy density, higher temperature stability, and longer cycle life. Due to the high charge-discharge performance of semi-solid-state batteries, their cells generally employ full tabs instead of the traditional single or bitab structures. However, full tabs, due to their larger area, are prone to wrinkling when flattened, leading to issues such as high internal resistance and high heat generation in semi-solid-state batteries.

[0003] To address the aforementioned issues, Chinese Patent Application No. CN202110312431.1 discloses a multi-tab battery, whose cell assembly includes a positive electrode and a negative electrode; the positive electrode includes a positive electrode substrate and multiple positive tabs; the negative electrode includes a negative electrode substrate and multiple negative tabs; both the positive and negative tabs extend radially outward from the same end of the cell assembly to opposite sides of the cell assembly and then bend axially towards the other end.

[0004] However, the above-mentioned multi-tab battery structural design has the following problems during use:

[0005] The aforementioned battery has multiple positive tabs extending radially outward to one side of the cell assembly and then bending axially. Similarly, multiple negative tabs extend radially outward to the other side of the cell assembly and then bend axially. Before welding the positive and negative tabs to the current collector, they need to be flattened. However, because the height of the positive tabs is uniform, when the positive tabs are bent inward after the electrode sheets are wound, the length of the inner positive tab after bending is shorter than that of the outer positive tab. The positive electrode tabs are relatively long after bending, meaning the inner and outer positive electrode tabs are not the same length after bending. Furthermore, because the width of the multiple positive electrode tabs is the same, the positive electrode tabs on the inner circle are more densely packed after the electrode sheet is wound. This results in more interference between the multiple positive electrode tabs and poor flatness, making the flattening process of the multiple positive electrode tabs more complex. Similarly, because the height of the multiple negative electrode tabs is the same, the length of the negative electrode tabs on the inner and outer circles is also not the same after bending, meaning there is also the problem of more interference between the multiple negative electrode tabs and poor flatness.

[0006] Therefore, there is an urgent need for a battery tab structure that is suitable for the inner and outer tabs to fit together, reduces tab interference, and simplifies tab handling. Utility Model Content

[0007] The purpose of this disclosure is to overcome the shortcomings of the prior art and provide a novel multi-tab flattening structure for battery cells with different inner and outer ring sizes, which is suitable for the mutual bonding of inner and outer ring tabs, reduces tab interference, and simplifies tab handling. It also provides a semi-solid cylindrical battery.

[0008] The purpose of this disclosure is achieved through the following technical solution:

[0009] A novel multi-tab flattening structure for battery cells with different inner and outer ring dimensions includes:

[0010] A positive electrode, a separator, and a negative electrode are arranged in a sequentially stacked and wound configuration. One side of the positive electrode has a plurality of spaced-apart positive tabs along its length. The height of the plurality of positive tabs increases sequentially along the winding direction of the positive electrode, and the width of the plurality of positive tabs also increases sequentially along the winding direction of the positive electrode, so that the ends of the plurality of positive tabs after being bent inward are flush. The positive tabs are used to connect to the positive terminal after bending.

[0011] The negative electrode sheet has multiple spaced negative electrodes on the side away from the positive electrode tab along its length. The height of the multiple negative electrodes increases sequentially along the winding direction of the negative electrode sheet, and the width of the multiple negative electrodes also increases sequentially along the winding direction of the negative electrode sheet, so that the ends of the multiple negative electrodes after being bent inward are flush. The negative electrodes are used to connect to the negative terminal after bending.

[0012] In one embodiment, the height of the positive electrode tab is 6mm-7mm.

[0013] In one embodiment, the height of the negative electrode tab is 5mm-6mm.

[0014] In one embodiment, the width of the positive electrode tab is 5.5mm-6.5mm.

[0015] In one embodiment, the width of the negative electrode tab is 5.5mm-6.5mm.

[0016] In one embodiment, the spacing between two adjacent positive tabs gradually increases along the winding direction of the positive electrode sheet.

[0017] In one embodiment, the spacing between two adjacent negative tabs gradually increases along the winding direction of the negative electrode sheet.

[0018] In one embodiment, the bending direction of the positive electrode tab is the same as the bending direction of the negative electrode tab.

[0019] In one embodiment, the bending direction of the positive electrode tab is opposite to that of the bending direction of the negative electrode tab.

[0020] A semi-solid cylindrical battery includes a novel multi-tab flattening structure with different inner and outer ring sizes as described in any of the above embodiments.

[0021] Compared with the prior art, this disclosure has at least the following advantages:

[0022] 1. The above-mentioned multi-tab flattening structure has multiple spaced positive tabs on one side of the positive electrode sheet along its length. The height of the multiple positive tabs increases sequentially along the winding direction of the positive electrode sheet, so that the positive tabs on the outermost ring are the tallest and the positive tabs on the innermost ring are the shortest. After the multiple positive tabs are bent inward in the same direction, the ends of the multiple positive tabs are flush, so that the positive tabs on the inner and outer rings fit together and have a higher flatness. Furthermore, the width of the multiple positive tabs increases sequentially along the winding direction of the positive electrode sheet, so that the positive tabs on the outermost ring are the widest and the positive tabs on the innermost ring are the narrowest, in order to adapt to the denser assembly space of the inner ring, thereby reducing interference between the tabs and making the operation of combing the tabs easier.

[0023] 2. The aforementioned multi-ear flattening structure features multiple spaced negative electrode ears on one side of the negative electrode sheet along its length. The height of these ears increases sequentially along the winding direction of the negative electrode sheet, resulting in the outermost ear being the tallest and the innermost ear being the shortest. After bending inwards in the same direction, the ends of the ears become flush, ensuring a better fit and flatness between the inner and outer ears. Furthermore, the width of these ears increases sequentially along the winding direction of the negative electrode sheet, resulting in the outermost ear being the widest and the innermost ear being the narrowest. This accommodates the denser assembly space within the inner ring, reducing interference between the ears and simplifying the operation of combing them. Attached Figure Description

[0024] 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.

[0025] Figure 1 An exploded view of a novel multi-tab flattening structure with differentially sized inner and outer rings in a battery cell according to an embodiment;

[0026] Figure 2 for Figure 1 The diagram shows a structural schematic of the positive electrode sheet of the novel battery cell with a multi-tab, non-kneading flattening structure featuring different sizes of the inner and outer rings.

[0027] Figure 3 for Figure 1 The diagram shows a structural schematic of the negative electrode sheet of a novel battery cell with a multi-tab, non-kneading flattening structure featuring different sizes of the inner and outer rings.

[0028] Figure 4 for Figure 1 The diagram shows a cross-sectional view of the novel battery cell with a multi-tab flattening structure featuring different inner and outer ring dimensions. Detailed Implementation

[0029] 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.

[0030] 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.

[0031] 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.

[0032] This disclosure provides a novel multi-tab flattening structure for a battery cell with different inner and outer ring dimensions, including a positive electrode, a separator, and a negative electrode. The positive electrode, the separator, and the negative electrode are stacked and wound sequentially. One side of the positive electrode has multiple spaced-apart positive tabs along its length. The height and width of the multiple positive tabs increase sequentially along the winding direction of the positive electrode, so that the bent ends of the multiple positive tabs are flush. The positive tabs are used to connect to the positive terminal after bending. The side of the negative electrode away from the positive tabs has multiple spaced-apart negative tabs along its length. The height and width of the multiple negative tabs increase sequentially along the winding direction of the negative electrode, so that the bent-in ends of the multiple negative tabs are flush. The negative tabs are used to connect to the negative terminal after bending.

[0033] The aforementioned multi-tab, non-kneading flattening structure features multiple spaced positive tabs on one side of the positive electrode sheet along its length. The height of these tabs increases sequentially along the winding direction of the positive electrode sheet, resulting in the outermost tab being the tallest and the innermost tab the shortest. After bending inwards in the same direction, the ends of the tabs become flush, ensuring a better fit and flatness between the inner and outer tabs. Furthermore, the width of the tabs increases sequentially along the winding direction, again resulting in the outermost tab being the widest and the innermost tab the narrowest. This accommodates the denser assembly space within the inner ring, reducing interference between the tabs and facilitating the tab combing process. It is more convenient; because there are multiple negative electrode tabs spaced apart along the length of one side of the negative electrode sheet, the height of the multiple negative electrode tabs increases sequentially along the winding direction of the negative electrode sheet, so that the negative electrode tabs on the outermost ring are the tallest and the negative electrode tabs on the innermost ring are the shortest. After the multiple negative electrode tabs are bent inward in the same direction, the ends of the multiple negative electrode tabs are flush, so that the negative electrode tabs on the inner and outer rings fit together and have a higher flatness. Furthermore, the width of the multiple negative electrode tabs increases sequentially along the winding direction of the negative electrode sheet, so that the negative electrode tabs on the outermost ring are the widest and the negative electrode tabs on the innermost ring are the narrowest, in order to adapt to the denser assembly space of the inner ring, thereby reducing interference between the electrode tabs and making the operation of combing the electrode tabs more convenient.

[0034] To better understand the technical solutions and beneficial effects of this disclosure, the following detailed description is provided in conjunction with specific embodiments:

[0035] like Figures 1 to 4As shown, a novel multi-tab flattening structure 10 with different inner and outer ring dimensions of a battery cell according to an embodiment includes a positive electrode 100, a separator 200, and a negative electrode 300. The positive electrode 100, the separator 200, and the negative electrode 300 are stacked and wound sequentially. A plurality of spaced positive tabs 110 are provided on one side of the positive electrode 100 along the length direction. The height of the plurality of positive tabs 110 increases sequentially along the winding direction of the positive electrode 100, and the width of the plurality of positive tabs 110 increases sequentially along the winding direction of the positive electrode 100, so that the ends of the plurality of positive tabs 110 are flush after bending. The positive tabs 110 are used to connect to the positive terminal after bending.

[0036] Furthermore, the negative electrode sheet 300 has a plurality of spaced negative electrode tabs 310 on the side away from the positive electrode tab 110 along its length. The height of the plurality of negative electrode tabs 310 increases sequentially along the winding direction of the negative electrode sheet 300, and the width of the plurality of negative electrode tabs 310 increases sequentially along the winding direction of the negative electrode sheet 300, so that the ends of the plurality of negative electrode tabs 310 after being bent inward are flush. The negative electrode tabs 310 are used to connect to the negative terminal after bending.

[0037] In this embodiment, the X direction is the winding direction of the positive and negative electrode sheets. The height of the multiple positive electrode tabs 110 increases sequentially along the winding direction of the positive electrode sheet 100, so that after the positive electrode sheet 100 is wound, the height of the outermost positive electrode tab 110 is the largest and the height of the innermost positive electrode tab 110 is the smallest. This makes the ends of the positive electrode tabs 110 on the inner ring and the positive electrode tabs 110 on the outer ring flush when the positive electrode tabs 110 are bent inward, that is, when the positive electrode tabs 110 are bent in the direction of the central axis of the cell. This is to adapt to the inner and outer rings of the positive electrode tabs 110 fitting together and to make the flatness between the multiple positive electrode tabs 110 higher. Furthermore, the width of the multiple positive tabs 110 increases sequentially along the winding direction of the positive electrode sheet 100. This results in the outermost positive tab 110 having the largest width after winding, and the innermost positive tab having the smallest width. This is because the inner circle has a larger number of positive tabs 110 and they are more densely packed. If the width of the inner circle's positive tabs 110 were larger, it would cause interference. By sequentially increasing the width of the multiple positive tabs 110 along the winding direction of the positive electrode sheet 100, it is better suited to the dense assembly space of the inner circle, thereby reducing interference between the tabs. It also reduces the need for sorting the tabs, making the tab-sorting operation simpler. Similarly, the height of the multiple negative tabs 310 increases sequentially along the winding direction of the negative electrode sheet 300, and the width of the multiple negative tabs 310 also increases sequentially along the winding direction of the negative electrode sheet 300. The principle is the same as the design of the positive tabs 110, and will not be repeated here.

[0038] The aforementioned multi-tab flattening structure features multiple spaced positive tabs 110 on one side of the positive electrode sheet 100 along its length. The height of these tabs 110 increases sequentially along the winding direction of the positive electrode sheet 100, resulting in the outermost tab 110 having the greatest height and the innermost tab 110 having the smallest height. After bending inwards in the same direction, the ends of the tabs 110 become flush, ensuring a better fit and flatness between the inner and outer tabs. Furthermore, the width of the tabs 110 increases sequentially along the winding direction of the positive electrode sheet 100, again resulting in the outermost tab 110 having the greatest width and the innermost tab 110 having the smallest width. This accommodates the denser assembly space within the inner ring, reducing interference between the tabs and facilitating the tab combing process. It is more convenient; since multiple negative electrode tabs 310 are provided at intervals along the length direction on one side of the negative electrode sheet 300, the height of the multiple negative electrode tabs 310 increases sequentially along the winding direction of the negative electrode sheet 300, so that the negative electrode tabs 310 on the outermost ring after the negative electrode sheet 300 is wound have the largest height, while the negative electrode tabs 310 on the innermost ring have the smallest height. After the multiple negative electrode tabs 310 are bent inward in the same direction, the ends of the multiple negative electrode tabs 310 are flush, so that the negative electrode tabs 310 on the inner and outer rings fit together and have a higher flatness. Furthermore, the width of the multiple negative electrode tabs 310 increases sequentially along the winding direction of the negative electrode sheet 300, so that the negative electrode tabs 310 on the outermost ring after the negative electrode sheet 300 is wound have the largest width, while the negative electrode tabs 310 on the innermost ring have the smallest width, in order to adapt to the denser assembly space of the inner ring, thereby reducing interference between the tabs and making the operation of combing the tabs more convenient.

[0039] In one embodiment, the height of the positive electrode tab 110 is 6mm-7mm. It is understood that the height of each positive electrode tab 110 is within the range of 6mm-7mm; for example, the outermost positive electrode tab 110 has a height of 7mm, the innermost positive electrode tab 110 has a height of 6mm, and the height of the innermost positive electrode tab 110 increases sequentially towards the outermost positive electrode tab 110.

[0040] In one embodiment, the height of the negative electrode tab 310 is 5mm-6mm. It is understood that the height of each negative electrode tab 310 is within the range of 5mm-6mm; for example, the outermost negative electrode tab 310 has a height of 6mm, the innermost negative electrode tab 310 has a height of 5mm, and the height of the innermost negative electrode tab 310 increases sequentially towards the outermost negative electrode tab 310.

[0041] In one embodiment, the width of the positive electrode tab 110 is 5.5mm-6.5mm. It can be understood that the width of each positive electrode tab 110 is within the range of 5.5mm-6.5mm; for example, the outermost positive electrode tab 110 has a width of 6.5mm, the innermost positive electrode tab 110 has a width of 5.5mm, and the width of the innermost positive electrode tab 110 increases sequentially towards the outermost positive electrode tab 110.

[0042] In one embodiment, the width of the negative electrode tab 310 is 5.5mm-6.5mm. It can be understood that the width of each negative electrode tab 310 is within the range of 5.5mm-6.5mm; for example, the outermost negative electrode tab 310 has a width of 6.5mm, the innermost negative electrode tab 310 has a width of 5.5mm, and the width of the innermost negative electrode tab 310 increases sequentially towards the outermost negative electrode tab 310.

[0043] like Figure 1 and Figure 2 As shown, in one embodiment, the spacing between two adjacent positive tabs 110 gradually increases along the winding direction of the positive electrode sheet 100. It is understood that the diameter of each turn of the positive electrode sheet 100 is different. By gradually increasing the spacing between two adjacent positive tabs 110 along the winding direction of the positive electrode sheet 100, multiple positive tabs 110 can be arranged in a one-to-one correspondence after the positive electrode sheet 100 is wound, so that multiple positive tabs 110 can be bent in the same direction and connected to the positive terminal.

[0044] like Figure 1 and Figure 3 As shown, in one embodiment, the spacing between two adjacent negative electrode tabs 310 gradually increases along the winding direction of the negative electrode sheet 300. It is understood that the diameter of each turn of the wound negative electrode sheet 300 is different. By gradually increasing the spacing between two adjacent negative electrode tabs 310 along the winding direction of the negative electrode sheet 300, multiple negative electrode tabs 310 can be arranged in a one-to-one correspondence after the negative electrode sheet 300 is wound, so that multiple negative electrode tabs 310 can be bent in the same direction and connected to the negative terminal.

[0045] like Figure 4 As shown, in one embodiment, the bending direction of the positive tab 110 is opposite to the bending direction of the negative tab 310. It can be understood that when the positive tab 110 and the negative tab 310 are wound together and located on opposite sides of the battery cell, the bending direction of the positive tab 110 is opposite to the bending direction of the negative tab 310.

[0046] In one embodiment, the bending direction of the positive tab 110 is the same as the bending direction of the negative tab 310. It is understood that when the positive tab 110 and the negative tab 310 are located on the same side of the battery cell after winding, the bending direction of the positive tab 110 is the same as the bending direction of the negative tab 310.

[0047] This application also provides a semi-solid cylindrical battery, including the novel multi-tab flattening structure 10 with different inner and outer ring sizes of the cell as described in any of the above embodiments.

[0048] Compared with the prior art, this disclosure has at least the following advantages:

[0049] 1. In the above-mentioned multi-tab flattening structure, the positive electrode sheet 100 has multiple spaced positive tabs 110 on one side along the length direction. The height of the multiple positive tabs 110 increases sequentially along the winding direction of the positive electrode sheet 100, so that the positive tabs 110 on the outermost ring of the positive electrode sheet 100 are the tallest, while the positive tabs 110 on the innermost ring are the shortest. After the multiple positive tabs 110 are bent inward in the same direction, the ends of the multiple positive tabs 110 are flush, so that the positive tabs 110 on the inner and outer rings fit together and have a higher flatness. Furthermore, the width of the multiple positive tabs 110 increases sequentially along the winding direction of the positive electrode sheet 100, so that the positive tabs 110 on the outermost ring of the positive electrode sheet 100 are the widest, while the positive tabs 110 on the innermost ring are the narrowest, in order to adapt to the denser assembly space of the inner ring, thereby reducing interference between the tabs and making the operation of combing the tabs easier.

[0050] 2. In the above-mentioned multi-tab flattening structure, the negative electrode sheet 300 has multiple spaced negative electrode tabs 310 on one side along its length. The height of the multiple negative electrode tabs 310 increases sequentially along the winding direction of the negative electrode sheet 300, so that the negative electrode tabs 310 on the outermost ring after the negative electrode sheet 300 is wound have the largest height, while the negative electrode tabs 310 on the innermost ring have the smallest height. After the multiple negative electrode tabs 310 are bent inward in the same direction, the ends of the multiple negative electrode tabs 310 are flush, so that the negative electrode tabs 310 on the inner and outer rings fit together and have a higher flatness. Furthermore, the width of the multiple negative electrode tabs 310 increases sequentially along the winding direction of the negative electrode sheet 300, so that the negative electrode tabs 310 on the outermost ring after the negative electrode sheet 300 is wound have the largest width, while the negative electrode tabs 310 on the innermost ring have the smallest width, in order to adapt to the denser assembly space of the inner ring, thereby reducing interference between the tabs and making the operation of combing the tabs easier.

[0051] 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 utility model 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 novel multi-tab flattening structure for a battery cell with different inner and outer ring dimensions, comprising a positive electrode, a separator, and a negative electrode, wherein the positive electrode, the separator, and the negative electrode are sequentially stacked and wound together, characterized in that... The positive electrode sheet has a plurality of spaced positive electrode tabs on one side along the length direction. The height of the plurality of positive electrode tabs increases sequentially along the winding direction of the positive electrode sheet, and the width of the plurality of positive electrode tabs increases sequentially along the winding direction of the positive electrode sheet, so that the ends of the plurality of positive electrode tabs are flush after bending. The positive electrode tabs are used to connect to the positive terminal after bending. The negative electrode sheet has multiple spaced negative electrodes on the side away from the positive electrode tab along its length. The height of the multiple negative electrodes increases sequentially along the winding direction of the negative electrode sheet, and the width of the multiple negative electrodes also increases sequentially along the winding direction of the negative electrode sheet, so that the bent ends of the multiple negative electrodes are flush. The negative electrodes are used to connect to the negative terminal after bending. The spacing between two adjacent positive tabs gradually increases along the winding direction of the positive electrode sheet, and the spacing between two adjacent negative tabs gradually increases along the winding direction of the negative electrode sheet; The height of the positive electrode tab is 6mm-7mm; the height of the negative electrode tab is 5mm-6mm; the width of the positive electrode tab is 5.5mm-6.5mm; the width of the negative electrode tab is 5.5mm-6.5mm. The bending direction of the positive electrode tab is the same as or opposite to the bending direction of the negative electrode tab.

2. A semi-solid cylindrical battery, characterized by, This includes the novel multi-tab flattening structure with different inner and outer ring dimensions of the battery cell as described in claim 1.

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