Multi-pole lug plate and battery

Abstract

The utility model belongs to battery technical field discloses a kind of multi-tab pole piece and battery, the multi-tab pole piece includes pole piece main body and the multiple tabs connected with the pole piece main body;Multiple tabs are connected to the edge of the longer side of the pole piece main body, and the interval distance between adjacent two tabs gradually increases;The connecting portion of the arc shape is equipped in the connection of tab and pole piece.The multi-tab pole piece and battery of the utility model pass through the design of the interval distance of adjacent tab increasing with winding number, avoid tab misplacement, guarantee welding effect and battery internal resistance stability, pass through arc connecting portion and convert the right angle transition of tab and pole piece into arc transition to reduce the risk of tab root fracture, reduce the probability of battery cell short-circuit scrap.

Description

Technical Field

[0001] This utility model belongs to the field of battery technology and relates to a multi-tab electrode and a battery. Background Technology

[0002] With the global energy structure adjustment and the rapid development of the energy storage industry, the demand for power energy storage batteries has increased significantly, with large capacity and high safety becoming the main development directions. To increase the capacity of a single cell, the number of winding turns needs to be increased. However, increasing the number of turns leads to a significant increase in the cumulative thickness tolerance of the positive and negative electrode sheets and the separator, causing electrode misalignment problems during the multi-tab winding process. Electrode misalignment can cause interference in subsequent process tooling fixtures, preventing the welding head from completely covering each layer of electrodes, directly affecting welding quality and battery internal resistance stability, and reducing battery performance.

[0003] Meanwhile, during the traditional electrode winding process, the electrode is prone to folding or breaking at the root, which can lead to short circuits and scrapping of the battery cell.

[0004] Therefore, there is an urgent need in the field for a multi-tab electrode and battery to solve the above-mentioned technical problems. Utility Model Content

[0005] In view of this, the purpose of this utility model is to solve the problem that misalignment of the tabs in the prior art leads to interference in the tooling fixtures of subsequent processes, affecting the welding quality and the stability of the battery's internal resistance, and reducing battery performance. It also solves the problem that the tabs are prone to folding or breaking at the root during the traditional tab winding process, resulting in short circuits and scrapping of the battery cell.

[0006] This utility model provides a multi-electrode electrode sheet, comprising an electrode sheet body and a plurality of electrode tabs connected to the electrode sheet body;

[0007] Multiple electrodes are connected to the edge of the longer side of the electrode body, and the spacing between two adjacent electrodes gradually increases;

[0008] The connection between the electrode tab and the electrode sheet is provided with an arc-shaped connection part.

[0009] As a further improvement of this utility model, the interval a1 between the first two adjacent electrodes and the interval an between the nth two adjacent electrodes satisfy the formula: an=a1+(n-1)d, where a1 is the circumference of the winding needle, n is the number of turns, and d is the increased thickness of the positive and negative electrode membranes.

[0010] As a further improvement of this utility model, among the plurality of electrode tabs, starting from the first electrode tab, the width of the first 10 electrode tabs decreases sequentially, or, among the plurality of electrode tabs, starting from the first electrode tab, the width of the last 10 electrode tabs decreases sequentially.

[0011] As a further improvement of this utility model, starting from the first electrode tab, the width difference between two adjacent electrodes in the first 10 electrodes is 0.4 mm, or, starting from the first electrode tab, the width difference between two adjacent electrodes in the last 10 electrodes is 0.4 mm.

[0012] As a further improvement of this utility model, the electrode tab includes: a connecting edge, two side edges connected to both ends of the connecting edge, and a distal edge disposed opposite to the connecting edge;

[0013] The connecting edge is connected to the electrode body through the arc-shaped connecting part.

[0014] As a further improvement of this utility model, the arc-shaped connecting part includes a first connecting arc and a second connecting arc;

[0015] The first connecting arc and the second connecting arc respectively connect the two sides, and the radius of the arc of the first connecting arc and the second connecting arc is 2mm.

[0016] As a further improvement of this utility model, the included angle between the side edge and the electrode body is 80°, and the radius of curvature at the connection between the side edge and the far edge is 8mm.

[0017] As a further improvement of this utility model, an opening is provided at the connection between the side and the distal side of the first electrode tab;

[0018] The electrode tab is provided with reinforcing ribs on its exterior.

[0019] This utility model also provides a battery, including the aforementioned multi-tab electrode.

[0020] As a further improvement of this utility model, the battery includes a separator, a positive electrode multi-tab sheet, the separator, and a negative electrode multi-tab sheet, which are sequentially wound and stacked outside the winding needle. The separator, the positive electrode multi-tab sheet, the separator, and the negative electrode multi-tab sheet form a winding core. The tabs on the positive electrode multi-tab sheet and the tabs on the negative electrode multi-tab sheet are located at the two ends of the winding core, respectively.

[0021] The technical effect of this utility model is as follows: Compared with the prior art, the multi-tab electrode sheet and battery provided by this utility model, through the design that the spacing between adjacent tabs increases with the number of winding turns, offsets the positional offset caused by the cumulative tolerance of the positive and negative electrode sheets and the separator thickness, thereby improving the alignment accuracy of the tabs after winding, avoiding interference of tooling fixtures in subsequent processes due to tab misalignment, reducing the problem of incomplete welding head coverage during subsequent welding, and ensuring welding effect and battery internal resistance stability.

[0022] By providing an arc-shaped connection at the junction of the tab and the electrode, the right-angle transition between the tab and the electrode is transformed into a circular arc transition, changing the stress transmission path from point contact to surface contact. This effectively disperses stress concentration at the root of the tab during winding, reduces the risk of tab root breakage, solves the problem of easy damage in traditional right-angle connections, and reduces the probability of cell short-circuiting and scrapping. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model 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 this utility model, not all embodiments. For those skilled in the art, other drawings obtained from these drawings without creative effort are all within the protection scope of this utility model.

[0024] Figure 1 This is a schematic diagram of the structure of a multi-pole tab provided in an embodiment of this utility model;

[0025] Figure 2 This is a schematic diagram of the electrode tab provided in an embodiment of the present invention;

[0026] Figure 3 This is a schematic diagram of the reinforcing rib provided in an embodiment of the present invention;

[0027] Figure 4 This is a schematic diagram of the battery structure provided in an embodiment of the present invention.

[0028] in,

[0029] 1 is a multi-pole tab, 10 is the main body of the pole piece, 20 is the tab, 21 is the arc-shaped connecting part, 211 is the first connecting arc, 212 is the second connecting arc, 22 is the connecting edge, 23 is the side edge, 24 is the far edge, 25 is the opening, and 26 is the reinforcing rib.

[0030] 100 is a battery. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the scope of the present utility model.

[0032] To make the description of this disclosure more detailed and complete, illustrative descriptions of the embodiments and specific examples of this utility model are provided below; however, this is not the only form of implementing or using the specific embodiments of this utility model. The embodiments cover the features of multiple specific embodiments and the methods, steps, and sequences for constructing and operating these specific embodiments. However, other specific embodiments can also be used to achieve the same or equivalent functions and sequence of steps. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0033] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0034] It should be understood that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this utility model described herein can be implemented in sequences other than those illustrated or described herein.

[0035] In the description of this utility model, the terms "front", "rear", "top", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0036] Please refer to Figures 1-4 One embodiment of this utility model provides a multi-tab electrode sheet and a battery to solve the problems in the prior art where misalignment of the tabs causes interference in the tooling fixtures of subsequent processes, affecting welding quality and battery internal resistance stability, and reducing battery performance, as well as the problem that the tabs are prone to folding or breaking at the root during traditional tab winding, leading to short circuits and scrapping of the battery cells.

[0037] Specifically, please refer to Figure 1 This is a schematic diagram of the structure of a multi-pole tab provided in an embodiment of the present invention. Figure 2This is a schematic diagram of the electrode tab structure provided in an embodiment of the present utility model. The multi-tab electrode sheet 1 includes an electrode sheet body 10 and multiple tabs 20 connected to the electrode sheet body 10. The multiple tabs 20 are connected to the edge of the longer side of the electrode sheet body 10, and the spacing between two adjacent tabs 20 gradually increases. The spacing between adjacent tabs 20 gradually increases along the length direction of the electrode sheet, forming a gradient distribution with a smaller front and a larger back. The design of the spacing between adjacent tabs 20 increasing with the number of winding turns offsets the positional offset caused by the cumulative tolerance of the positive and negative electrode sheets and the separator thickness, improves the alignment accuracy of the tabs 20 after winding, avoids the interference of tooling fixtures in subsequent processes due to the misalignment of the tabs 20, reduces the problem of incomplete welding head coverage during subsequent welding, and ensures the welding effect and the internal resistance stability of the battery 100. When the traditional equally spaced tabs 20 are wound, the diameter of the core increases with each additional turn of the electrode sheet, resulting in an increase in the circumference of each turn. This causes cumulative misalignment in the actual position of the tabs 20. This application compensates for the increased circumference by using an incremental spacing design. The spacing between adjacent tabs 20 increases along the length of the electrode sheet to compensate for the change in circumference and ensure that each turn of tabs 20 is radially aligned after winding.

[0038] An arc-shaped connecting portion 21 is provided at the connection between the tab 20 and the electrode sheet. By providing the arc-shaped connecting portion 21 at the connection between the tab 20 and the electrode sheet, the right-angle transition between the tab 20 and the electrode sheet is transformed into a circular arc transition, changing the stress transmission path from point contact to surface contact. This effectively disperses the stress concentration at the root of the tab 20 during winding, reduces the risk of breakage at the root of the tab 20, solves the problem of easy damage in traditional right-angle connections, and reduces the probability of cell short circuit and scrapping.

[0039] As a further improvement of this utility model, the interval a1 between the first two adjacent tabs 20 and the interval an between the nth adjacent tabs 20 satisfy the formula: an = a1 + (n-1)d, where a1 is the circumference of the winding needle, n is the number of turns, and d is the increase in thickness of the positive and negative electrode membranes. The interval between adjacent tabs 20 is defined by the arithmetic series formula an = a1 + (n-1)d, and the interval between the tabs 20 is used to compensate for the cumulative dimensional changes during the winding process of the battery 100. a1 corresponds to the circumference of the winding needle, which is the starting axis for winding the electrode. The first turn of the electrode is wound on the winding needle, and the interval between its tabs 20 must match the circumference of the winding needle to ensure that the position of the tabs 20 is aligned with the axis of the winding needle during the initial winding. n corresponds to the number of winding turns. With each additional turn, the number of layers of the electrode and membrane increases, and the diameter of the winding core increases accordingly. d corresponds to the total thickness increment of the positive and negative electrode and membrane in a single turn of winding. Since each turn of winding adds one layer of positive electrode, one layer of negative electrode, and two layers of separator, the value of d is equal to the sum of the thickness of the positive electrode, the thickness of the negative electrode, and the thickness of the two separators. During the winding process, the circumference of the core increases with the number of turns. The circumference of the first turn ≈ 2π × the radius of the winding needle (i.e., a1); the circumference of the second turn ≈ a1 + 2π × (positive electrode + negative electrode + 2 × separator thickness); the circumference of the nth turn ≈ a1 + 2π × (n-1) × (total thickness increment). Since the value of d is equal to the circumference increment corresponding to the thickness increment of a single turn (which can be approximated as d ≈ 2π × total thickness increment in simplified calculations), when the spacing of the tabs 20 is set according to an = a1 + (n-1)d, the spacing distance of each turn of tabs 20 is exactly equal to the actual circumference of the core in that turn, ensuring that the tabs 20 are precisely aligned radially after winding. Traditional evenly spaced tabs 20, failing to consider the increasing core circumference, result in cumulative misalignment after winding. This misalignment increases with the number of turns, causing the welding head to fail to completely cover all tabs 20 during subsequent welding, leading to incomplete or missed welds. This application uses an arithmetic sequence compensation to ensure strict spatial alignment of the tabs 20 on each turn, guaranteeing complete welding head coverage and improving welding yield. Large-capacity cells require increased winding turns. In traditional structures, tab misalignment amplifies exponentially with the number of turns. This application's incremental spacing design is linearly related to the number of turns, maintaining tab alignment accuracy even with increased turns, meeting the design requirements of large-capacity energy storage batteries 100 and overcoming the capacity limitations of traditional structures.

[0040] As a further improvement of this utility model, among the plurality of tabs 20, starting from the first tab 20, the width of the first 10 tabs 20 decreases sequentially; or, among the plurality of tabs 20, starting from the first tab 20, the width of the last 10 tabs 20 decreases sequentially. The first 10 tabs 20 correspond to the inner layer of the battery 100 winding near the winding needle area. The inner layer has a small radius of curvature and strong spatial constraint, resulting in a large radial compressive force when the tabs 20 are stacked. In the first 10 turns of the conventional equal-width tabs 20, due to the small radius of curvature, the tabs 20 are squeezed together, causing wrinkles or deformation. The design of decreasing width of the first 10 tabs 20 alleviates the compression of the inner layer tabs 20, reduces structural damage, and allows the size of the inner layer tabs 20 to adjust synchronously with the increase of the winding radius, reducing compressive stress, reducing the probability of wrinkles in the tabs 20, and avoiding the risk of short circuits caused by structural deformation. The last 10 tabs 20 correspond to the outer layer area of ​​the battery winding 100. The outer layer has a large radius of curvature, but the total cumulative thickness of the electrode and separator is the largest. The tabs 20 are prone to mechanical interference due to edge protrusion. Due to the cumulative thickness in the last 10 turns of the outer layer, the electrode edge is prone to exceed the reference contour. Traditional equal-width tabs 20 will exacerbate this protrusion, causing friction between the tabs 20 and the separator during winding. The design of decreasing width of the last 10 tabs 20 avoids interference of the outer layer tabs 20, improves winding stability, compensates for the dimensional deviation caused by the cumulative thickness, avoids edge protrusion of the outer layer tabs 20, reduces frictional damage during winding, and reduces the separator breakage rate. In the first or last 10 tabs 20, a progressively decreasing width design is adopted to create a continuous dimensional gradient. This ensures that the width of the tab 20 matches the winding space requirements of its location. The inner tabs 20 gradually narrow with increasing turns to accommodate the increasing radius of curvature, while the outer tabs 20 gradually narrow with increasing turns to offset edge protrusion caused by thickness accumulation. This continuous gradient in tab 20 width can be achieved in a single die-cutting process without additional equipment parameter adjustments. Compared to traditional segmented width designs, this reduces die changeover time and improves production efficiency.

[0041] As a further improvement of this utility model, starting from the first tab 20, the width difference between two adjacent tabs 20 in the first 10 tabs 20 is 0.4mm, or, starting from the first tab 20, the width difference between two adjacent tabs 20 in the last 10 tabs 20 is 0.4mm. Setting the width difference between adjacent tabs 20 to 0.4mm covers the cumulative increase in thickness per turn while also reserving a safety margin, ensuring a dynamic balance between the decreasing rate of width reduction of the tabs 20 and the increasing rate of the winding radius. In the first 10 turns, the winding radius of curvature is small, and the radial pressure of the stacked tabs 20 increases linearly with the number of turns. The fixed difference of 0.4mm allows the width of the inner tabs 20 to gradually narrow with the number of turns, precisely offsetting the spatial compression caused by the decrease in curvature and preventing the tabs 20 from squeezing each other. In the last 10 turns, the total cumulative thickness is the largest, and the edges of the tabs 20 are prone to radial protrusion due to the thickness accumulation. A fixed difference of 0.4mm allows the width of the outer tab 20 to gradually narrow with increasing winding count, compensating for edge offset caused by accumulated thickness and preventing mechanical interference between the tab 20 and the equipment fixture. This fixed difference of 0.4mm can be automated through preset programming on the laser die-cutting equipment, eliminating the need for repeated parameter adjustments based on electrode thickness and winding count. Compared to the traditional per-winding calibration method, this reduces debugging time, improves the operational stability of the die-cutting equipment, and increases single-batch production efficiency.

[0042] As a further improvement of this utility model, the tab 20 includes: a connecting edge 22, two side edges 23 connecting both ends of the connecting edge 22, and a distal edge 24 disposed opposite to the connecting edge 22; the connecting edge 22 is connected to the electrode body 10 through the arc-shaped connecting part 21. The connecting edge 22, as the direct connection part between the tab 20 and the electrode body 10, bears the fixing function of the tab 20 and is the starting point for stress to be transmitted from the electrode body 10 to the tab 20. The side edges 23 are the transition parts connecting the connecting edge 22 and the distal edge 24. The distal edge 24 is the end of the tab 20 away from the electrode body 10. The arc-shaped connecting part 21 is located between the connecting edge 22 and the electrode body 10, replacing the traditional right-angle transition with a rounded surface, transforming the line contact of the connecting edge 22 into a surface contact, and dispersing the stress concentration point. During the winding process, the tab 20 will be subjected to the pulling force generated by the curling of the electrode body 10 and the squeezing force of adjacent tabs 20 or diaphragms. The arc-shaped connection 21 disperses the tensile force along the arc surface through a rounded transition, preventing tearing at the root of the connection edge 22 due to stress concentration. Traditionally, the connection edge 22 of the tab 20 transitions to the electrode body 10 at a right angle, which easily leads to cracks at the root of the connection edge 22 during winding. This application improves the tear resistance at the root of the connection edge 22 through the arc-shaped connection 21, preventing short circuits and scrapping of the battery cell due to tab 20 breakage.

[0043] As a further improvement of this utility model, the arc-shaped connecting part 21 includes a first connecting arc 211 and a second connecting arc 212; the first connecting arc 211 and the second connecting arc 212 respectively connect the two sides 23, and the radius of curvature of the first connecting arc 211 and the second connecting arc 212 is 2mm. The first connecting arc 211 and the second connecting arc 212 correspond to the connection points between the two sides 23 of the tab 20 and the electrode body 10, forming a symmetrically distributed double-arc transition zone. The two sides 23 of the tab 20 are connected to the electrode body 10 through the first connecting arc 211 and the second connecting arc 212, so that the tangential direction of the side 23 and the connecting arc is smoothly connected, avoiding stress concentration due to abrupt angle changes. When the tab 20 is subjected to winding tension, the stress is transmitted from the side 23 to the connecting arc, and then diffuses to both sides of the electrode body 10 through the symmetrical distribution of the double arcs, significantly reducing the stress value per unit area. The symmetrical design of the first connecting arc 211 and the second connecting arc 212 ensures that the tab 20 is subjected to uniform force during winding, avoiding deviation of the tab 20 due to excessive stress on one side. At the same time, when the radius of curvature is 2mm, the transition between the arc surface and the electrode body 10 is smooth, and there will be no friction with adjacent diaphragms, reducing the diaphragm wear rate and avoiding short circuits between the positive and negative electrodes due to diaphragm damage.

[0044] As a further improvement of this utility model, the included angle between the side 23 and the electrode body 10 is 80°, and the radius of curvature at the connection between the side 23 and the far side 24 is 8mm. The included angle between the side 23 and the electrode body 10 directly determines the opening angle of the tab 20. The 80° design is a balance between spatial constraints and conductivity requirements in the winding process: if the included angle is too small, the tab 20 will be excessively contracted inward, and the sides 23 of adjacent tabs 20 will easily squeeze each other during winding, causing the tab 20 to deform; if the included angle is too large, the tab 20 will be excessively opened outward, occupying extra winding space, resulting in an increase in the core diameter, and easily interfering with the diaphragm or equipment tooling. The 80° included angle retains the conductive path of the tab 20 extending outward, and also reserves deformation space for radial contraction during winding. The connection between side 23 and far side 24 is the weak bending area of ​​tab 20. The 8mm large radius arc design disperses the bending stress. Far side 24 is the main area for subsequent welding. The curvature radius of the 8mm arc makes the edge of far side 24 transition smoothly, the welding head fits more closely with far side 24, the current distribution during welding is more uniform, and the rate of cold weld is reduced.

[0045] As a further improvement of this utility model, an opening 25 is provided at the connection between the side 23 and the far side 24 of the first electrode 20. The first electrode 20 serves as the reference electrode 20 for winding, and the opening 25 at the connection between its side 23 and far side 24 is a positioning mark hole. The connection between the side 23 and far side 24 is a non-core conductive area of ​​the electrode 20. Opening the hole 25 here avoids affecting the current conduction path. Simultaneously, this position is located at the edge of the electrode 20, facilitating identification by the optical sensor of the winding equipment. The opening 25 is located in the non-conductive core area, not affecting the current conduction area of ​​the electrode 20, and avoiding increased resistance due to the opening 25. The opening 25 is designed at the edge of the electrode 20. Unlike traditional designs that require a separate mold to punch holes in the middle of the electrode 20, resulting in scrap material, this new laser-cut die-cutting process integrates the scrap material into a single piece, preventing scrap fragments from falling onto the electrode sheet and causing short circuits and safety hazards.

[0046] Please see Figure 3 The electrode tab 20 is provided with reinforcing ribs 26 on its exterior. The reinforcing ribs 26 are located on the exterior of the electrode tab 20, increasing the local thickness and forming a rigid support frame to distribute stress throughout the electrode tab 20, preventing localized deformation. The reinforcing ribs 26 can be dot-shaped, strip-shaped, S-shaped, etc., forming an integrated structure with the electrode tab 20 body, enhancing the bending section modulus of the electrode tab 20. The reinforcing ribs 26 provide support in the thin areas of the electrode tab 20, reducing the central deflection of the electrode tab 20 during winding and preventing adhesion to adjacent electrode tabs 20 or diaphragms. During winding, the reinforcing ribs 26 reduce welding defects caused by folding of the electrode tab 20 by dispersing stress.

[0047] Please see Figure 4 This utility model also provides a battery 100, including the aforementioned multi-tab electrode 1. It is understood that the battery 100 provided by this utility model includes the aforementioned multi-tab electrode 1, and therefore the battery 100 possesses all the technical advantages brought by the multi-tab electrode 1. The arithmetic interval design of the multi-tab electrode 1 ensures precise alignment of the tabs 20 after winding, solving the misalignment problem caused by accumulated tolerances in traditional electrodes, thus improving the welding yield of the battery 100. The arc-shaped connection portion 21 and reinforcing rib 26 design of the tabs 20 significantly reduces the risk of tab breakage and folding, reducing the scrap rate of the battery 100 due to tab 20 structural failure. The variable width design of the electrode adapts to the spatial differences between the inner and outer layers of the winding, avoiding interference from tab stacking, thus improving the structural stability of the battery 100 during cyclic charging and discharging, and extending the cycle life of the battery 100.

[0048] As a further improvement of this utility model, the battery 100 includes a separator (not shown), a positive electrode multi-tab plate 1, the separator, and a negative electrode multi-tab plate 1, which are sequentially wound and stacked outside a winding needle (not shown). The separator, the positive electrode multi-tab plate 1, the separator, and the negative electrode multi-tab plate 1 form a core (not shown). The tabs 20 on the positive electrode multi-tab plate 1 and the tabs 20 on the negative electrode multi-tab plate 1 are located at opposite ends of the core. During winding, the separator, the positive electrode multi-tab plate 1, the separator, and the negative electrode multi-tab plate 1 are stacked alternately in the order of the winding needle to form a sandwich structure. The two separators respectively isolate the positive electrode multi-tab plate 1 and the negative electrode multi-tab plate 1, preventing direct contact and short circuit between the positive electrode multi-tab plate 1 and the negative electrode multi-tab plate 1. The positive and negative electrode tabs 20 are located at both ends of the winding core. During winding, the positive electrode tab 20 extends concentratedly at one end of the winding core, and the negative electrode tab 20 extends concentratedly at the other end, avoiding cross-contact between the positive and negative electrode tabs 20 on the winding core. The two electrode tabs 20 are respectively connected to the positive and negative terminals of the battery 100 by welding, forming independent current loops and reducing mutual interference during current conduction.

[0049] Traditional wound diaphragm structures are not laid out in a standardized manner, and the positive and negative electrode plates may come into direct contact. However, the double diaphragm sandwich design of this application ensures that there is always at least one layer of diaphragm between the positive and negative electrodes. Combined with the layout of the tabs 20 at both ends, it reduces the risk of short circuit.

[0050] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0051] The above embodiments only illustrate preferred implementations of this utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A multi-tab tab sheet, characterized by, The pole piece comprises a pole piece body and a plurality of pole tabs connected to the pole piece body. The plurality of pole tabs are connected to the edge of the longer side of the pole piece body, and the interval distance between two adjacent pole tabs gradually increases. An arc-shaped connecting portion is arranged at the connection between the pole tab and the pole piece. The interval distance a1 between the first two adjacent pole tabs and the interval distance an between the nth two adjacent pole tabs satisfy the formula: an=a1+(n-1)d, wherein a1 is the circumference of the winding needle, n is the number of turns, d is the increased thickness of the positive and negative pole piece separators, and a reinforcing rib is arranged outside the pole tab.

2. The multiple tab plate of claim 1, wherein, The width of the first 10 pole tabs gradually decreases from the first pole tab, or the width of the last 10 pole tabs gradually decreases from the first pole tab.

3. The multiple tab plate of claim 1, wherein, The difference between the widths of the first 10 pole tabs is 0.4mm, or the difference between the widths of the last 10 pole tabs is 0.4mm.

4. The multiple tab plate of claim 1, wherein, The pole tab comprises a connecting edge, two side edges connected to both ends of the connecting edge, and a far edge arranged opposite to the connecting edge. The connecting edge is connected to the pole piece body through the arc-shaped connecting portion.

5. The multiple tab plate of claim 4, wherein, The arc-shaped connecting portion comprises a first connecting arc and a second connecting arc. The first connecting arc and the second connecting arc are connected to the two side edges respectively, and the radius of the first connecting arc and the second connecting arc is 2mm.

6. The multiple tab plate of claim 5, wherein, The included angle between the side edge and the pole piece body is 80°, and the radius of the connecting portion between the side edge and the far edge is 8mm.

7. The multiple tab plate of claim 4, wherein, The connecting portion between the side edge and the far edge of the first pole tab is provided with an opening.

8. A battery, characterized by The battery comprises a plurality of the multi-pole tab pole pieces according to any one of claims 1 to 7.

9. The battery of claim 8, wherein, The battery comprises a separator, a positive multi-pole tab pole piece, a separator and a negative multi-pole tab pole piece which are sequentially wound and stacked outside the winding needle, and the separator, the positive multi-pole tab pole piece, the separator and the negative multi-pole tab pole piece form a winding core, and the pole tabs on the positive multi-pole tab pole piece and the pole tabs on the negative multi-pole tab pole piece are respectively located at both ends of the winding core.

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