Multi-tab battery cell structure and battery

Abstract

The utility model relates to the field of battery cells, and discloses a multi-tab battery cell structure and a battery, the multi-tab battery cell structure comprises a roll core, the roll core comprises a first pole piece, a second pole piece, a diaphragm, first tabs and second tabs, the first pole piece, the second pole piece and the diaphragm are wound into a column shape, the plurality of first tabs are arranged on the first pole piece, the first tabs are located at the end part of the roll core, and the second tabs are located at the end part of the roll core. The plurality of first tabs are arranged on the first pole piece, the plurality of first tabs are distributed in a first preset angle range, the plurality of second tabs are arranged on the second pole piece, the second tabs are positioned at the end part of the roll core far away from the direction of the first tabs, and the plurality of second tabs are distributed in a second preset angle range. According to the application, the distance between the adjacent first tabs and the distance between the second tabs are designed according to the thicknesses of the first pole piece, the second pole piece and the diaphragm, so that the first tabs are distributed in the first preset angle and the second tabs are distributed in the second preset angle after the roll core is formed by winding; a higher degree of alignment of the first tab and the second tab is not required.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of battery cells, in particular to a multi-tab battery cell structure and a battery. BACKGROUND

[0002] The multi-tab design of cylindrical battery cells, as a major innovation in the field of battery technology, aims to meet the urgent demand for high-performance batteries in the market of electric vehicles, drones, portable electronic devices, and energy storage systems. This design effectively improves the current transmission efficiency and thermal management capability of the battery by increasing the current transmission path and area, thereby significantly improving the energy density, power output, and cycle life of the battery. However, despite its excellent performance, multi-tab battery cell products are rarely seen on the market. This is mainly due to the complexity of raw material selection and production process during battery cell production, making it difficult to ensure the consistency of the thickness of the tab. The uneven thickness of the tab greatly affects the alignment of the tabs during tab winding, severely affecting the overall performance and stability of the battery. CONTENT OF THE UTILITY MODEL

[0003] Therefore, the purpose of the present application is to overcome the shortcomings of the prior art and provide a multi-tab battery cell structure and a battery.

[0004] To achieve the above-mentioned purpose, the technical solution adopted by the present application is as follows:

[0005] The present application provides:

[0006] A multi-tab battery cell structure, comprising a winding core, the winding core comprising:

[0007] a first tab, a second tab, and a separator, the first tab, the second tab, and the separator being wound into a cylindrical shape;

[0008] a first tab, a second tab, and a separator, the first tab, the second tab, and the separator being wound into a cylindrical shape;

[0009] a second tab, a plurality of the second tabs being arranged on the second tab, the second tabs being located at the end of the winding core away from the first tabs, and a plurality of the second tabs being distributed within a second predetermined angle range.

[0010] Further, the distance between adjacent first tabs gradually increases or decreases or remains unchanged along the winding direction of the winding core; the distance between adjacent second tabs gradually increases or decreases or remains unchanged along the winding direction of the winding core.

[0011] Further, the diameter of the winding core is D, and the length of the first tab and the second tab is L, satisfying: D / 2 < L < D.

[0012] Furthermore, the winding core has a central hole, the diameter of the central hole is R, the width of the first electrode tab and the second electrode tab is W, and W>R is satisfied.

[0013] Furthermore, the corners of the first pole tab and the connection between the first pole tab and the first pole piece are transformed into arcs, and the corners of the second pole tab and the connection between the second pole tab and the second pole piece are transformed into arcs.

[0014] Furthermore, the first electrode tab and the second electrode tab are in a rectangular or trapezoidal shape.

[0015] Furthermore, both ends of the winding core are provided with insulating members, and the insulating members include insulating sheets, and the insulating sheets are provided with avoidance grooves.

[0016] Furthermore, a through hole is provided at the center of the insulating sheet.

[0017] Furthermore, a plurality of liquid conducting holes are provided on the insulating sheet.

[0018] The present application provides a battery comprising any of the multi-electrode battery cell structures described above.

[0019] Before winding the battery cell, the present application can design the spacing between adjacent first pole tabs, as well as the spacing between the second pole tabs, based on the thickness of the first pole sheet, the second pole sheet, and the diaphragm, so that after winding into a core, the first pole tabs are distributed within a first preset angle, and the second pole tabs are distributed within a second preset angle, thereby completing the winding process without requiring a high degree of alignment between the first pole tabs and the second pole tabs.

[0020] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0022] Figure 1 Shows a schematic diagram of the first tab distribution of the present application;

[0023] Figure 2 A schematic diagram of the second tab distribution of the present application is shown;

[0024] Figure 3 A schematic diagram of the first pole piece and the first pole lug of the present application is shown;

[0025] Figure 4 The second pole piece and the second tab of the application are shown in the schematic diagram;

[0026] Figure 5 The first tab and the second tab of the application are shown in the schematic diagram of the structure at the end of the winding core;

[0027] Figure 6 The winding core of the application is shown in the schematic diagram of the structure of the winding core at both ends;

[0028] Figure 7 The structure of the insulation piece of the application is shown in the schematic diagram.

[0029] Main element symbol explanation:

[0030] 100-winding core; 200-first pole piece; 300-second pole piece; 400-first tab; 500-second tab; 600-center hole; 700-insulation piece; 710-insulation sheet; 720-avoidance slot; 730-through hole; 740-liquid guide hole. DETAILED DESCRIPTION

[0031] The embodiments of the application are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary only, and are used only for the purpose of explaining the application, and cannot be understood as a limitation of the application.

[0032] In the description of the application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the application.

[0033] In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0034] In the present application, unless specifically defined and limited otherwise, the terms "mounting", "connecting", "connecting", "fixing" and the like should be broadly understood, for example, can be fixedly connected, or can be detachably connected, or can be integrated; can be mechanically connected, or can be electrically connected; can be directly connected, or can be indirectly connected through an intermediate medium, or can be the internal communication of two elements or the interaction relationship between 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.

[0035] In the present application, unless specifically defined and limited otherwise, the first feature is "on" or "under" the second feature. The first and second features can be in direct contact, or the first and second features can be in indirect contact through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be the first feature directly above or obliquely above the second feature, or only indicates that the first feature is higher than the second feature in horizontal height. The first feature "below", "below" and "below" the second feature can be the first feature directly below or obliquely below the second feature, or only indicates that the first feature is lower than the second feature in horizontal height.

[0036] The existing multi-pole ear cell has difficulty in ensuring the consistency of the pole piece thickness, so that the alignment of the pole ear during winding cannot be accurately guaranteed. Therefore, the positive and negative pole pieces are distributed within a certain angle after winding, so that higher alignment is not required.

[0037] Specifically, the present application provides a multi-pole ear cell structure, comprising a winding core 100, the winding core 100 comprising a first pole piece 200, a second pole piece 300, a separator, a first pole ear 400 and a second pole ear 500, the first pole piece 200, the second pole piece 300 and the separator are wound into a column shape.

[0038] In the present embodiment, a plurality of first pole ears 400 are arranged on the first pole piece 200, the first pole ears 400 are located at the end of the winding core 100, and a plurality of first pole ears 400 are distributed within a first preset angle range. A plurality of second pole ears 500 are arranged on the second pole piece 300, the second pole ears 500 are located at the end of the winding core 100 away from the first pole ears 400, and a plurality of second pole ears 500 are distributed within a second preset angle range.

[0039] In this embodiment, the first electrode 200 can be a positive electrode or a negative electrode. If the first electrode 200 is a positive electrode, the first electrode tab 400 is a positive electrode, the second electrode 300 is a negative electrode, and the second electrode tab 500 is a negative electrode. If the first electrode 200 is a negative electrode, the first electrode tab 400 is a negative electrode, the second electrode 300 is a positive electrode, and the second electrode tab 500 is a positive electrode. In practice, the design can be carried out according to actual needs and is not limited here.

[0040] In this embodiment, before the winding core 100 is wound into shape, the spacing between the first pole ears 400 along the winding direction needs to be designed based on the length and thickness of the diaphragm, the length and thickness of the first pole piece 200, the length and thickness of the second pole piece 300, and the diameter of the winding needle. Similarly, the spacing between the second pole ears 500 along the winding direction also needs to be designed based on the above factors, so that after winding, several first pole ears 400 are distributed within the first preset angle, and several second pole ears 500 are within the second preset angle. For this reason, there are no strict requirements on the alignment of the first pole ears 400 and the alignment of the second pole ears 500, as long as they are distributed within the first preset angle and the second preset angle respectively.

[0041] See Figure 1 and Figure 2 As shown, the first preset angle mentioned above can be understood as the angle α between the end of the innermost first pole tab 400 along the winding direction and the end of the outermost first pole tab 400 away from the winding direction, where α satisfies: 0°<α≤120°. The second preset angle is also the angle β between the end of the innermost second pole tab 500 along the winding direction and the end of the outermost second pole tab 500 away from the winding direction, where β satisfies: 0°<α≤120°. For example, α and β can be selected from angles such as 10°, 30°, 60°, 90°, and 120°. In practice, the angles of α and β can be designed according to needs.

[0042] The distance between adjacent first electrode tabs 400 along the winding direction of the winding core 100 gradually increases, decreases, or remains unchanged; the distance between adjacent second electrode tabs 500 along the winding direction of the winding core 100 gradually increases, decreases, or remains unchanged.

[0043] In this embodiment, the number of the first electrode tabs 400 and the second electrode tabs 500 is generally between 6 and 22. In practice, the number can be set to other numbers as needed, which is not limited here.

[0044] In this embodiment, the first pole tab 400 and the second pole tab 500 begin to appear in any circle between the first three circles and the last three circles, that is, there is no first pole tab 400 on the first pole piece 200 in the first three circles and the last three circles of winding, and there is no second pole tab 500 on the second pole piece 300 in the first three circles and the last three circles of winding. The purpose of doing this is to prevent the first pole tab 400 and the second pole tab 500 from being damaged when they are subsequently flattened and fallen over due to excessive curvature in the innermost circle.

[0045] The diameter of the winding core 100 is D, and the length of the first electrode tab 400 and the second electrode tab 500 is L, which satisfies: D / 2<L<D.

[0046] The winding core 100 has a central hole 600 . The diameter of the central hole 600 is R. The width of the first electrode tab 400 and the second electrode tab 500 is W, satisfying W>R.

[0047] In order to have a first pole tab 400 and a second pole tab 500 of sufficient size, the second pole tab 500 also needs to be inverted. Here, the first pole tab 400 is taken as an example for detailed explanation. The first pole tab 400 needs to be inverted, that is, the first pole tab 400 needs to be bent and inverted toward the center hole 600, so that each first pole tab 400 forms a larger area, thereby reducing the internal resistance and thus reducing the heat generated during charging and discharging, and there can be sufficient area for welding, thereby improving the performance of the battery cell.

[0048] In this embodiment, in order to cover the center hole 600, the length of the first pole tab 400 and the second pole tab 500 needs to be greater than the radius of the core 100 and smaller than the diameter of the core 100. The purpose of this design is to have sufficient distance to cover the center hole 600 without exceeding the other end of the core 100. Similarly, the width of the first pole tab 400 and the second pole tab 500 needs to be greater than the diameter of the center hole 600 so that the center hole 600 can be covered.

[0049] The corners of the first pole tab 400 and the connection between the first pole tab 400 and the first pole piece 200 are arc-shaped transitions, and the corners of the second pole tab 500 and the connection between the second pole tab 500 and the second pole piece 300 are arc-shaped transitions.

[0050] See Figure 3 and Figure 4As shown, in order to prevent the first pole tab 400 from breaking at the connection with the first pole piece 200, the connection between the first pole tab 400 and the first pole piece 200 is made into an arc transition, thereby making the connection between the two more stable. In addition, the corner of the first pole tab 400 can also be made into an arc transition. The second pole tab 500 and the first pole tab 400 are treated in the same way, thereby making the connection between the second pole tab 500 and the second pole piece 300 more stable.

[0051] The first electrode tab 400 and the second electrode tab 500 are in a rectangular or trapezoidal shape.

[0052] When the first pole tab 400 and the second pole tab 500 are rectangular, the width of the first pole tab 400 and the width of the second pole tab 500 are greater than the diameter of the center hole 600, and the length of the first pole tab 400 and the second pole tab 500 are greater than the radius of the core 100 but smaller than the diameter of the core 100; when the first pole tab 400 and the second pole tab 500 are trapezoidal, explained by the isosceles trapezoidal distance, the position where the first pole tab 400 and the second pole tab 500 contact the center hole 600 is greater than the diameter of the center hole 600, or the length of the upper base (smallest side) of the first pole tab 400 and the second pole tab 500 is greater than the diameter of the center hole 600, and the height of the first pole tab 400 and the second pole tab 500 is greater than the radius of the core 100 but smaller than the diameter of the core 100.

[0053] In other embodiments, the shapes of the first electrode tab 400 and the second electrode tab 500 can be designed as needed. The shapes of the first electrode tab 400 and the second electrode tab 500 include but are not limited to the above shapes.

[0054] Insulating members 700 are provided at both ends of the winding core 100 . The insulating members 700 include insulating sheets 710 . A relief groove 720 is formed through the insulating sheets 710 .

[0055] See Figures 5 to 7 As shown, in order to prevent the two ends of the core 100 from directly contacting the steel shell of the battery and causing short circuit or damage, insulating members 700 are provided at both ends of the core 100 to form a pattern of the two ends of the core 100 through the insulating members 700.

[0056] In this embodiment, in order to enable the first pole lug 400 and the second pole lug 500 to be bent and collapsed, it is necessary to open a corresponding avoidance groove 720 on the insulating sheet 710. The shape of the avoidance groove 720 can be adapted to the shape formed by the multiple first pole lugs 400 and the second pole lugs 500 at the end of the winding core 100. For example, the shape of the avoidance groove 720 can be fan-shaped, and the avoidance of the first pole lug 400 and the second pole lug 500 is achieved through the avoidance groove 720, that is, at the end of the winding core 100, the first pole lug 400 can be inserted into the avoidance groove 720, and the second pole lug 500 can also be inserted into the avoidance groove 720 at its end.

[0057] A through hole 730 is formed at the center of the insulating sheet 710 ; and a plurality of liquid guide holes 740 are formed on the insulating sheet 710 .

[0058] Please continue reading Figure 7 As shown, in order to facilitate the injection of electrode liquid, a through hole 730 and a liquid guide hole 740 are opened on the insulating sheet 710, so that the electrolyte can more easily enter the interior of the winding core 100.

[0059] The present application also provides a battery comprising any of the multi-electrode battery cell structures described above.

[0060] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0061] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A multi-electrode battery cell structure, characterized in that: The invention comprises a winding core (100), wherein the winding core (100) comprises: A first pole piece (200), a second pole piece (300) and a diaphragm, wherein the first pole piece (200), the second pole piece (300) and the diaphragm are wound into a columnar shape; A first pole lug (400), wherein a plurality of the first pole lugs (400) are arranged on the first pole piece (200), the first pole lug (400) is located at an end of the winding core (100), and the plurality of the first pole lugs (400) are distributed within a first preset angle range; A second pole lug (500), wherein a plurality of the second pole lugs (500) are arranged on the second pole piece (300), the second pole lug (500) is located at an end of the winding core (100) in a direction away from the first pole lug (400), and the plurality of the second pole lugs (500) are distributed within a second preset angle range.

2. The multi-electrode battery core structure according to claim 1, wherein: The distance between adjacent first pole tabs (400) along the winding direction of the winding core (100) gradually increases, decreases, or remains unchanged; the distance between adjacent second pole tabs (500) along the winding direction of the winding core (100) gradually increases, decreases, or remains unchanged.

3. The multi-electrode battery core structure according to claim 1, characterized in that: The diameter of the winding core (100) is D, and the lengths of the first electrode tab (400) and the second electrode tab (500) are L, satisfying: D / 2<L<D.

4. The multi-electrode battery core structure according to claim 1, characterized in that: The winding core (100) has a central hole (600), the diameter of the central hole (600) is R, the width of the first electrode tab (400) and the second electrode tab (500) is W, and W>R is satisfied.

5. The multi-electrode battery core structure according to claim 1, characterized in that: The corners of the first pole tab (400) and the connection between the first pole tab (400) and the first pole piece (200) are subjected to arc transition, and the corners of the second pole tab (500) and the connection between the second pole tab (500) and the second pole piece (300) are subjected to arc transition.

6. The multi-electrode battery core structure according to claim 1, characterized in that: The first electrode tab (400) and the second electrode tab (500) are rectangular or trapezoidal in shape.

7. The multi-electrode battery core structure according to claim 1, characterized in that: Both ends of the winding core (100) are provided with insulating members (700), the insulating members (700) include insulating sheets (710), and the insulating sheets (710) are provided with avoidance grooves (720) extending therethrough.

8. The multi-electrode battery core structure according to claim 7, characterized in that: A through hole (730) is provided at the center of the insulating sheet (710).

9. The multi-electrode battery core structure according to claim 7 or 8, characterized in that: The insulating sheet (710) is provided with a plurality of liquid guide holes (740).

10. A battery, characterized in that: The multi-electrode battery cell structure comprises the multi-electrode battery cell structure according to any one of claims 1 to 9.

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