All-tab battery
By designing bonding wire groups of different lengths in the all-tab battery, setting them radially along the cell and extending towards the cell axis, the problem of uneven current distribution is solved, achieving uniform current distribution and optimization of battery internal resistance.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-25
- Publication Date
- 2026-03-27
AI Technical Summary
In a full-tab battery, the tabs are arranged in a spiral pattern, resulting in the inner tab's circumference being much smaller than the outer tab's circumference. This uneven spacing between solder joints leads to uneven current distribution.
The design incorporates bonding wires of varying lengths, arranged radially along the battery cell and extending towards the cell axis from the same circumference. This design ensures that longer bonding wires pass through a greater number of tabs, while shorter wires pass through fewer tabs, thereby achieving a more uniform current distribution.
By adjusting the length and distribution of the bonding wires, a uniform current distribution was achieved in the all-tab battery, optimizing the current path and improving the uniformity of the battery's AC internal resistance.
Smart Images
Figure CN224053250U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to the battery technical field, concretely relates to secondary battery, especially relates to a full tab battery. BACKGROUND
[0002] The current collector disc of the full tab battery needs to be welded with the tab of the battery cell, thereby forming welding lines on the current collector disc.
[0003] In the related art, there are multiple welding lines on the current collector disc, and the welding lines are arranged along the radial direction of the current collector disc, thereby forming the same number of welding points on each circle of tabs.
[0004] However, since the tabs are arranged in a spiral line, the circumference of the inner circle of tabs is much smaller than the circumference of the outer circle of tabs, that is, the spacing between the welding points on the inner circle of tabs is much smaller than the spacing between the welding points on the outer circle of tabs, thereby causing uneven distribution of current.
[0005] Therefore, how to solve the technical problem of uneven distribution of current is an urgent problem for those skilled in the art.
[0006] It should be noted that the above information disclosed in the background section of the present application is only used to understand the background technology of the present application, and therefore, the above description is not considered to constitute prior art information. CONTENT OF THE UTILITY MODEL
[0007] The present application provides at least a full tab battery, which comprises: a battery cell, one end of which is a positive tab arranged in a spiral line, and the other end of which is a negative tab arranged in a spiral line; a positive current collector disc, which is welded with the positive tab and forms multiple groups of first welding lines with different lengths on the positive current collector disc, each first welding line in the first welding line group being arranged along the radial direction of the battery cell; a negative current collector disc, which is welded with the negative tab and forms multiple groups of second welding lines with different lengths on the negative current collector disc, each second welding line in the second welding line group being arranged along the radial direction of the battery cell; the lengths of the first welding lines in the same first welding line group are the same, and the lengths of the second welding lines in the same second welding line group are the same.
[0008] In an optional embodiment, the end portions of each second welding line away from the axis of the battery cell are located on the same circle.
[0009] In an optional embodiment, the number of second welding lines in the second welding line group is at least two, and each second welding line is uniformly distributed.
[0010] In an optional embodiment, the number of second welding lines in each second welding line group is the same, and the included angle between adjacent second welding lines ranges from 25° to 35°.
[0011] In an alternative embodiment, the positive current collector plate comprises: a plate body and a tail body; wherein the number of first welding lines in each of the first welding line groups is at least two; each of the first welding lines is located on the plate body, and the end of each of the first welding lines away from the axis of the battery cell is located on the same circle.
[0012] In an alternative embodiment, the first welding line and / or the second welding line is in a wave shape.
[0013] In an alternative embodiment, the first welding line and / or the second welding line comprises: a plurality of first and last connected semi-circular sub-welding lines; wherein the diameter of the semi-circular sub-welding line ranges from 0.2mm to 1.0mm.
[0014] In an alternative embodiment, the first welding line and / or the second welding line is in a triangular wave shape.
[0015] In an alternative embodiment, the first welding line and / or the second welding line comprises: a plurality of first and last connected linear sub-welding lines; wherein the length of the linear sub-welding line ranges from 0.2mm to 1.0mm, and / or the included angle between adjacent linear sub-welding lines ranges from 15° to 120°.
[0016] In an alternative embodiment, the ratio of the length L1 of the first welding line to the radius R1 of the plate body ranges from 10% to 90%, and the length L1 of the first welding line is at least 3mm; the ratio of the length L2 of the second welding line to the radius R2 of the negative current collector plate ranges from 10% to 90%, and the length L2 of the second welding line is at least 3mm.
[0017] In an alternative embodiment, the AC internal resistance of the full tab battery is in the range of 0.1-10 milliohms.
[0018] In an alternative embodiment, the AC internal resistance of the full tab battery is in the range of 1-5 milliohms.
[0019] The beneficial effects of the present utility model are that the welding lines with different lengths in the full tab battery all take the same circle as the endpoint and extend towards the axis of the battery cell, so that the longer the welding line is, the closer it is to the axis of the battery cell, that is, the longer the welding line is, the more tab rings it passes through, therefore, there are more welding points on the tab ring with large circumference, and there are fewer welding points on the tab ring with small circumference, so that the current distribution is relatively uniform.
[0020] Other features and advantages of the present utility model will be set forth in the subsequent description, and some of them will become apparent from the description, or will be understood by those skilled in the art through implementation of the present utility model. The purposes and other advantages of the present utility model are achieved and obtained by the structures specifically pointed out in the description and the drawings.
[0021] In order to make the above-mentioned purpose, features and advantages of the present application more obvious and easy to understand, the preferred embodiments are described in detail below, and the accompanying drawings are described as follows. BRIEF DESCRIPTION OF DRAWINGS
[0022] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the drawings needed in the specific embodiments or prior art description will be briefly introduced as follows. Obviously, the drawings described below are some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.
[0023] Figure 1 A structure schematic diagram of a current collecting disc and an electric core of a full-tab battery is provided for the embodiments of the present disclosure;
[0024] Figure 2 A structure schematic diagram of a negative current collecting disc with a second welding line is provided for the embodiments of the present disclosure;
[0025] Figure 3 A structure schematic diagram of a positive current collecting disc with a first welding line is provided for the embodiments of the present disclosure;
[0026] Figure 4 A structure schematic diagram of a positive current collecting disc with a third welding line is provided for the embodiments of the present disclosure;
[0027] Figure 5 A structure schematic diagram of a wave-shaped welding line is provided for the embodiments of the present disclosure;
[0028] Figure 6 A structure schematic diagram of a triangular wave-shaped welding line is provided for the embodiments of the present disclosure;
[0029] Figure 7 A structure schematic diagram of a straight line-shaped sub-welding line is provided for the embodiments of the present disclosure.
[0030] In the drawings:
[0031] Electric core 1, positive tab 11, positive tab ring 111, negative tab 12, negative tab ring 121;
[0032] Positive current collecting disc 2, disc body 21, tail body 22;
[0033] Negative current collecting disc 3;
[0034] First welding line group 4, first welding line 40, semicircle-shaped sub-welding line 41, straight line-shaped sub-welding line 42;
[0035] Second welding line group 5, second welding line 50;
[0036] Third weld line 60. Detailed Implementation
[0037] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.
[0038] It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Furthermore, in the figures, the thickness of parts may be exaggerated or reduced for the purpose of effectively depicting the technical content.
[0039] The following detailed description, with reference to the accompanying drawings, describes some embodiments of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.
[0040] like Figure 1 As shown, at least one embodiment provides a full-tab battery, including: a cell 1, a positive current collector 2 and a negative current collector 3. One end of the cell 1 has a positive tab 11 distributed in a spiral pattern, and the other end of the cell 1 has a negative tab 12 distributed in a spiral pattern. The positive current collector 2 is welded to the positive tab 11, and the negative current collector 3 is welded to the negative tab 12.
[0041] like Figure 2 As shown, in some embodiments, after the negative current collector 3 is welded to the negative electrode tab 12, multiple sets of second welding wire groups 5 of different lengths are formed on the negative current collector 3.
[0042] Specifically, the second bonding wires 50 on the negative current collector 3 are arranged radially along the cell 1, and there are several groups of second bonding wires 5 according to different lengths, with each group of second bonding wires 5 including at least two second bonding wires 50.
[0043] like Figure 2 As shown, in some embodiments, the ends of each second welding line 50 that are away from the axis of the negative collector disk 3 are all located on the same circumference.
[0044] Specifically, the negative electrode loops 12, which are distributed in a spiral shape, are formed by winding and can be approximated as being composed of several negative electrode loops 121 with different radii. The negative electrode loops 121 closer to the axis have a smaller circumference, while the negative electrode loops 121 closer to the outer edge have a larger circumference.
[0045] In the embodiment, the second welding wires 50 with different lengths all take the same negative tab ring 121 as the end point and then extend to the axis of the battery cell 1. That is, the second welding wire 50 with longer length passes through more negative tab rings 121, and thus the number of welding points (the point where the second welding wire 50 contacts the negative tab 12) on the negative tab ring 121 with larger circumference is more, and the number of welding points on the negative tab ring 121 with smaller circumference is less, so that the current distribution is relatively uniform.
[0046] In some embodiments, the AC internal resistance of the full-tab battery is 0.1-10 mΩ; preferably, the AC internal resistance of the full-tab battery is 1-5 mΩ.
[0047] In some embodiments, optionally, the axis of the negative current collector plate 3 is provided with a through hole.
[0048] As shown in the figure, in some embodiments, the negative current collector plate 3 is a regular circle, so that in order to make the current distribution more uniform, the number of second welding wires 50 in each second welding wire group 5 is set to be the same, and the included angle α between adjacent second welding wires 50 ranges from 25° to 35°. Figure 2
[0049] Optionally, the negative current collector plate 3 is welded with 3 groups of 12 second welding wires 50, and the lengths of the three groups of second welding wire groups 5 are 1.5 mm, 3 mm and 4.5 mm respectively, and the included angle α between adjacent second welding wires 50 is 30°.
[0050] As shown in the figure, in some embodiments, the positive current collector plate 2 includes a disc body 21 and a tail body 22, the disc body 21 is used for welding with the positive tab 11, and the tail body 22 is used for connecting with a battery cover cap (not shown in the figure). Figure 3 Specifically, after the disc body 21 is welded with the positive tab 11, the disc body 21 forms a plurality of first welding wires 40 arranged along the radial direction of the battery cell 1, and the first welding wires 40 are divided into a plurality of first welding wire groups 4 according to different lengths, and each first welding wire group 4 includes at least two first welding wires 40.
[0051] As shown in the figure, in some embodiments, the end of each first welding wire 40 away from the axis of the battery cell 1 is located on the same circumference.
[0052] Figure 3 As shown in the figure, in some embodiments, the positive tab 11 in the spiral line distribution is formed by winding, which can be approximately regarded as being composed of a plurality of positive tab rings 111 with different radii, the positive tab ring 111 close to the axis has a small circumference, and the positive tab ring 111 close to the periphery has a large circumference.
[0053] As shown in the figure, in some embodiments, the positive tab 11 in the spiral line distribution is formed by winding, which can be approximately regarded as being composed of a plurality of positive tab rings 111 with different radii, the positive tab ring 111 close to the axis has a small circumference, and the positive tab ring 111 close to the periphery has a large circumference. Figure 3
[0054] In the embodiment, most of the first welding lines 40 have the same positive tab 111 as the end point, and then extend to the axis of the battery cell 1, that is, the longer the first welding line 40, the more the number of positive tab 111s passed through, so that the number of welding points on the positive tab 111 with large circumference is more, and the number of welding points on the positive tab 111 with small circumference is less, thereby making the current distribution relatively uniform.
[0055] As shown in Figure 4 some embodiments, due to the presence of the tail body 22, the disc body 21 is not a regular circle, in order to stabilize the connection between the tail body 22 and the disc body 21, a third welding line 60 is welded on the disc body 21 close to the tail body 22, and the end of the third welding line 60 away from the axis of the battery cell 1 is not on the same circumference as the end of the first welding line 40 away from the axis of the battery cell 1.
[0056] As shown in Figure 5 some embodiments, the first welding line 40 and / or the second welding line 50 is in a wave shape.
[0057] Specifically, the first welding line 40 and / or the second welding line 50 includes a plurality of semicircular sub-welding lines 41 connected end to end; wherein the diameter of the semicircular sub-welding line 41 ranges from 0.2mm to 1.0mm.
[0058] As shown in Figure 6 some embodiments, the first welding line 40 and / or the second welding line 50 is in a triangular wave shape.
[0059] Specifically, the first welding line 40 and / or the second welding line 50 includes a plurality of straight line sub-welding lines 42 connected end to end; wherein the length of the straight line sub-welding line 42 ranges from 0.2mm to 1.0mm.
[0060] As shown in Figure 7 some embodiments, the angle β between adjacent straight line sub-welding lines 42 ranges from 15° to 120°.
[0061] As shown in Figure 2 some embodiments, the ratio of the length L2 of the second welding line 50 to the radius R2 of the negative current collecting disc 3 ranges from 10% to 90%, and the length L2 of the second welding line 50 is at least 3mm.
[0062] As shown in Figure 3 some embodiments, the ratio of the length L1 of the first welding line 40 to the radius R1 of the disc body 21 ranges from 10% to 90%, and the length L1 of the first welding line 40 is at least 3mm;
[0063] In summary, in the full-tab battery, the welding wires with different lengths all take the same circumference as the end point and extend to the axis of the cell 1, so that the longer the welding wire is, the closer it is to the axis of the cell 1, that is, the more the number of the tab rings 121 the welding wire with a longer length passes through, and therefore, the more the number of the welding points on the tab ring 121 with a larger circumference and the less the number of the welding points on the tab ring 121 with a smaller circumference, so that the current distribution is relatively uniform.
[0064] The welding wires 30 with different lengths all take the same circumference as the end point and extend to the center of the current collector plate 1, so that the longer the welding wire 30 is, the closer it is to the center of the current collector plate 1, and the more the number of the tab 21 rings it passes through, and the shorter the welding wire 30 is, the farther it is from the center of the current collector plate 1, and the less the number of the tab 21 rings it passes through, that is, the number of the welding points of the outer ring of the tab 21 and the welding wire 30 is more, and the number of the welding points of the inner ring of the tab 21 and the welding wire 30 is less, so that the number of the welding points of the outer ring of the tab 21 and the inner ring of the tab 21 is close, so that the current distribution is relatively uniform.
[0065] In this document, when referring to a first component being on a second component, this can mean that the first component can be formed directly on the second component, or a third component can be interposed between the first component and the second component.
[0066] In this document, when an element or layer is referred to as being "on", "engaged to", "connected to", "attached to", or "coupled to" another element or layer, it can be directly on, engaged, connected, attached, or coupled to the other element or layer, or one or more intermediate elements or layers can be present. In contrast, when an element is referred to as being "directly on", "directly engaged to", "directly connected to", "directly attached to", or "directly coupled to" another element or layer, there are no intermediate elements or layers present. Other words used to describe the relationship between elements should be interpreted in a like fashion (e.g., "between" versus "directly between", "adjacent" versus "directly adjacent", etc.). As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.
[0067] In this document, example embodiments of the disclosure will be described in greater detail with reference to the accompanying drawings. As used herein, expressions such as "at least one of", when preceded by a list of two or more members, modify the entire list of members and do not modify the individual members of the list. For example, the expression "at least one of a, b, and c" should be understood to include only a, only b, only c, both a and b, both a and c, both b and c, or all of a, b, and c.
[0068] The terminology used herein is for the purpose of describing particular example configurations only and is not intended to be limiting. As used herein, the singular forms "a," "an," and "the" can be intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises," "comprising," "including," and "having," are inclusive and therefore specify the presence of stated features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or groups thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring their performance in the particular order
[0069] As used herein, the phrases "in an embodiment," "according to an embodiment," "in some embodiments," and the like generally mean the particular feature, structure, or characteristic following the phrase can be included in at least one embodiment of the present disclosure. Thus, appearances of such phrases in various places in the specification do not necessarily all refer to the same embodiment. As used herein, the terms "example," "exemplary," and the like are utilized to merely indicate that an example or an exemplary configuration is described. Any embodiment, aspect or design described herein as an "example" or "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments, aspects or designs. Rather, the term "example" is intended to indicate that the particular feature, structure, or characteristic being described is included in at least one embodiment. Thus, even though a particular feature, structure, or characteristic is described in an exemplary embodiment, it is not necessary that it be included in every embodiment.
[0070] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, the terms "mounting", "connection", "connecting" should be understood in a broad sense, for example, can be fixedly connected, or can be detachably connected, or integrally connected; can be mechanically connected, can be electrically connected; can be directly connected, can be indirectly connected through an intermediate medium, can be internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.
[0071] In the description of the utility model, it is necessary to explain, the term "center", "upper", "lower", "left", "right", "vertical", "horizontal", "internal", "external" and so on indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawing, only for the convenience of describing the utility model and simplifying the description, and not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, therefore, it cannot be understood as a limitation on the utility model. In addition, terms such as "first", "second" and other numerical terms are used in this text, and do not imply order or sequence unless the text is explicitly indicated. Therefore, the above-discussed first element, component, area, layer or section can be referred to as the second element, component, area, layer or section without departing from the teachings of the example embodiments.
[0072] Spatially relative terms, such as "internal", "external", "lower", "under", "bottom", "top", "above", and the like, can be used herein for ease of description to describe one element or feature's relationship to another element(s) or feature(s) as illustrated in the figures. The spatially relative terms can be intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" the other elements or features. Thus, the example term "below" can encompass both an orientation of above and below. The device can be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
[0073] In the above discussion, unless otherwise stated, the terms "about", "approximately", "substantially" and the like, when used in describing a numerical value, mean a variation of + / - 10% of the value.
[0074] With the above ideal embodiments according to the utility model as the inspiration, through the above description, relevant staff can make various changes and modifications without deviating from the technical idea of the utility model. The technical scope of the utility model is not limited to the content in the specification, and the technical scope must be determined according to the scope of claims.
Claims
1. A full tab cell, characterized by, The battery comprises: an electric core (1) having a positive tab (11) at one end and a negative tab (12) at the other end; a positive current collector (2) welded to the positive tab (11) and having a plurality of first welding line groups (4) with different lengths formed thereon, each first welding line (40) in the first welding line group (4) being arranged along the radial direction of the electric core (1); a negative current collector (3) welded to the negative tab (12) and having a plurality of second welding line groups (5) with different lengths formed thereon, each second welding line (50) in the second welding line group (5) being arranged along the radial direction of the electric core (1); the lengths of the first welding lines (40) in the same first welding line group (4) are the same, and the lengths of the second welding lines (50) in the same second welding line group (5) are the same.
2. The full-tab battery according to claim 1, wherein the end portions of the second welding lines (50) away from the axis of the electric core (1) are located on the same circle.
3. The full-tab battery according to claim 1, wherein the number of the second welding lines (50) in the second welding line group (5) is at least two, and the second welding lines (50) are uniformly distributed.
4. The full-tab battery according to claim 3, wherein the number of the second welding lines (50) in each second welding line group (5) is the same, and the included angle between adjacent second welding lines (50) ranges from 25° to 35°.
5. The full-tab battery according to claim 1, wherein the positive current collector (2) comprises a disc body (21) and a tail body (22); and the number of the first welding lines (40) in each first welding line group (4) is at least two; each first welding line (40) is located on the disc body (21), and the end portion of each first welding line (40) away from the axis of the electric core (1) is located on the same circle.
6. The full-tab battery according to claim 1, wherein the first welding line (40) and / or the second welding line (50) is in a wave shape; the first welding line (40) and / or the second welding line (50) comprises a plurality of semi-circular sub-welding lines (41) connected end to end; and the diameter of the semi-circular sub-welding line (41) ranges from 0.2 mm to 1.0 mm.
7. The full-tab battery according to claim 1, wherein the first welding line (40) and / or the second welding line (50) is in a triangular wave shape; the first welding line (40) and / or the second welding line (50) comprises a plurality of linear sub-welding lines (42) connected end to end; and the length of the linear sub-welding line (42) ranges from 0.2 mm to 1.0 mm, and / or the included angle between adjacent linear sub-welding lines (42) ranges from 15° to 120°.
8. The full-tab battery according to claim 5, wherein the ratio of the length L1 of the first welding line (40) to the radius R1 of the disc body (21) ranges from 10% to 90%, and the length L1 of the first welding line (40) is at least 3 mm. The ratio of the length L2 of the second welding line (50) to the radius R2 of the negative current collector plate (3) is in the range of 10% to 90%, and the length L2 of the second welding line (50) is at least 3 mm.
9. The full-mesh tab battery of claim 1, wherein, The AC internal resistance of the full-mesh tab battery is in the range of 0.1-10 mΩ.
10. The full-mesh tab battery of claim 1, wherein, The AC internal resistance of the full-mesh tab battery is in the range of 1-5 mΩ.