Electrode assembly and battery cell having same

Abstract

The utility model discloses an electrode assembly and a battery monomer with the electrode assembly. The electrode assembly comprises an electrode assembly body and an electrode assembly, the tab is arranged on at least one side of the pole group body in the first direction, the tab comprises a plurality of sub-tabs, the plurality of sub-tabs are sequentially arranged in the thickness direction of the pole group body, and in the thickness direction of the pole group body, every two adjacent sub-tabs are arranged in a staggered manner in the second direction and are connected in a lap joint manner; and the first direction, the second direction and the thickness direction of the pole group body are mutually vertical in pairs. According to the electrode assembly disclosed by the utility model, the thickness and the number of layers of the ultrasonic welding tab pieces can be reduced, so that the probability of pseudo soldering or solder skips between the tab pieces is reduced, and the yield of the electrode assembly is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to an electrode assembly and a battery monomer having the same. Background Art

[0002] During the production of the electrode group of the laminated battery, the electrode tabs on the multiple electrode sheets need to be formed by ultrasonic welding. In the related technology, the electrode tabs have many layers and are thick during welding, which is prone to cold welding or welding leakage, resulting in a low yield rate of the electrode assembly. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model provides an electrode assembly with a higher yield rate.

[0004] The utility model also provides a battery monomer having the electrode assembly.

[0005] According to the first aspect of the utility model, the electrode assembly includes: a pole group body; a pole ear, wherein the pole ear is arranged on at least one side of the pole group body in a first direction, and the pole ear includes a plurality of sub-pole ears, and the plurality of sub-pole ears are arranged in sequence in the thickness direction of the pole group body, and in the thickness direction of the pole group body, two adjacent sub-pole ears are staggered in the second direction and overlapped, and the first direction, the second direction and the thickness direction of the pole group body are perpendicular to each other.

[0006] According to the electrode assembly of the first aspect of the utility model, the number of layers and thickness of the ultrasonically welded pole tabs can be reduced, thereby reducing the probability of cold welding or leaking welding between the pole tabs and improving the yield rate of the electrode assembly.

[0007] According to some embodiments of the present invention, the overlapping width of two adjacent sub-electrode ears in the second direction is 3 mm-8 mm.

[0008] According to some embodiments of the present invention, in a direction from one side toward the other side in the thickness direction of the pole group body, the plurality of sub-pole ears are arranged in sequence along the second direction.

[0009] According to some embodiments of the present invention, the width of the sub-electrode tab in the second direction is 20 mm-50 mm.

[0010] According to some embodiments of the present invention, in the second direction, the distance between the sub-pole lug and the end edge of the pole group body is no more than 330 mm.

[0011] According to some embodiments of the utility model, there are two pole ears and they are respectively a positive pole ear and a negative pole ear, the positive pole ear includes a plurality of positive sub-pole ears, the negative pole ear includes a plurality of negative sub-pole ears, the positive pole ear and the negative pole ear are respectively arranged on both sides of the pole group body in the first direction, the electrode assembly includes a plurality of positive pole sheets and a plurality of negative pole sheets, the positive pole sheet includes: a positive pole sheet body and a positive pole ear sheet, the negative pole sheet includes: a negative pole sheet body and a negative pole ear sheet, the positive pole sheet body and the negative pole sheet body are alternately stacked in the thickness direction of the electrode assembly, a plurality of the positive pole ear sheets form the positive pole ear, and a plurality of the negative pole ear sheets form the negative pole ear.

[0012] According to some embodiments of the utility model, a plurality of the positive electrode sheets form a plurality of positive electrode sheet groups, and the plurality of the positive electrode sheet groups are arranged in sequence in the thickness direction of the electrode assembly, and the plurality of the positive electrode tab sheets in the positive electrode sheet groups are stacked in the thickness direction of the electrode assembly to form the positive electrode sub-tabs; a plurality of the negative electrode sheets form a plurality of negative electrode sheet groups, and the plurality of the negative electrode sheet groups are arranged in sequence in the thickness direction of the electrode assembly, and the plurality of the negative electrode tab sheets in the negative electrode sheet groups are stacked in the thickness direction of the electrode assembly to form the negative electrode sub-tabs.

[0013] According to some embodiments of the present invention, the number of the positive electrode sheets in the positive electrode sheet group is 5-50; and / or the number of the negative electrode sheets in the negative electrode sheet group is 5-50.

[0014] According to some embodiments of the utility model, one side end of the pole group body in the second direction is along the first end, and in the direction from one side toward the other side in the thickness direction of the pole group body, the distances between the plurality of positive pole sub-ears and the first end increase successively, and the distances between the plurality of negative pole sub-ears and the first end increase successively, or, in the direction from one side toward the other side in the thickness direction of the pole group body, the distances between the plurality of positive pole sub-ears and the first end increase successively, and the distances between the plurality of negative pole sub-ears and the first end decrease successively.

[0015] A battery cell according to a second aspect of the present invention comprises: the electrode assembly according to the first aspect of the present invention.

[0016] According to the battery cell of the second aspect of the present invention, by providing the electrode assembly according to the first aspect of the present invention, the yield rate can be improved.

[0017] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic diagram of an electrode assembly according to an embodiment of the utility model;

[0019] Figure 2 yes Figure 1 A schematic diagram of another angle of the electrode assembly shown in ;

[0020] Figure 3 yes Figure 1 A schematic diagram of the electrode assembly shown in another angle;

[0021] Figure 4 is a schematic diagram of an electrode assembly according to yet another embodiment of the utility model.

[0022] Reference numerals:

[0023] 100. Electrode assembly;

[0024] 10. pole group body; 11. first end;

[0025] 20, pole ear; 20a, sub-pole ear; 21, positive pole ear; 21a, positive sub-pole ear; 22, negative pole ear; 22a, negative sub-pole ear. DETAILED DESCRIPTION

[0026] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0027] Reference below Figure 1-Figure 4 An electrode assembly 100 according to an embodiment of the first aspect of the present invention is described.

[0028] like Figure 1-Figure 4 As shown, the electrode assembly 100 according to the first embodiment of the present utility model includes: an electrode group body 10 and an electrode ear 20.

[0029] Specifically, the pole lug 20 is arranged on the pole group body 10 in the first direction (eg Figure 1 The pole lug 20 includes a plurality of sub-pole lugs 20a. For example, the sub-pole lugs 20a may be two, three or four. The plurality of sub-pole lugs 20a are arranged in a thickness direction (for example, Figure 2 In the thickness direction of the pole group body 10, two adjacent sub-pole ears 20a in the second direction (for example Figure 2The first direction, the second direction and the thickness direction of the pole group body 10 are staggered and overlapped in a front-to-back direction (as shown in FIG. 1 ), and the first direction, the second direction and the thickness direction of the pole group body 10 are perpendicular to each other.

[0030] During the operation of the electrode assembly 100 , the electrode assembly body 10 can realize the charge and discharge functions of the battery cell, and the electrode tab 20 can realize the current transmission between the electrode assembly body 10 and the outside.

[0031] Among them, the electrode assembly 100 includes a plurality of stacked electrode sheets, on which electrode tabs are provided. During the production process of the electrode assembly 100, the electrode tabs 20 are formed by ultrasonic welding of a plurality of electrode tab sheets. It is understandable that during the ultrasonic welding process, when there are too many layers of electrode tab sheets and the thickness after stacking is relatively thick, welding leaks or cold welds are likely to occur after welding.

[0032] In the present embodiment, the pole lug 20 is divided into a plurality of sub-pole lugs 20a, so that the number of layers of the pole lug sheets in a single sub-pole lug 20a can be reduced, thereby reducing the thickness of the pole lug sheets in a single sub-pole lug 20a; in the thickness direction of the pole group body 10, two adjacent sub-pole lugs 20a are staggered in the second direction and overlapped and connected, so that when the pole lug 20 is ultrasonically welded, the maximum welding thickness is the thickness of the two sub-pole lugs 20a, thereby reducing the number of welding layers and thickness when the pole lug 20 is ultrasonically welded, thereby reducing the probability of cold welding or leaking welding between the pole lug sheets.

[0033] According to the electrode assembly 100 of the embodiment of the utility model, the thickness and number of layers of the ultrasonically welded pole tabs can be reduced, thereby reducing the probability of cold welding or leaking welding between the pole tabs and improving the yield rate of the electrode assembly 100.

[0034] In some embodiments of the utility model, the overlap width of two adjacent sub-electrode ears 20a in the second direction is 3mm-8mm. For example, the overlap width of two adjacent sub-electrode ears 20a in the second direction can be 3mm, 4mm, 5mm or 8mm, thereby, the flow capacity and connection strength between the two adjacent sub-electrode ears 20a can meet the use requirements. In the process of product design, the overlap width of two adjacent sub-electrode ears 20a in the second direction can be adjusted, so as to meet more product design requirements and reduce the difficulty of product design.

[0035] In some embodiments of the present invention, Figure 2-Figure 4 As shown, in the direction from one side to the other side in the thickness direction of the electrode group body 10, a plurality of sub-electrode ears 20a are arranged in sequence along the second direction. In this way, non-adjacent sub-electrode ears 20a will not overlap in the thickness direction of the electrode group body 10, thereby reducing the probability of overlapping of non-adjacent sub-electrode ears 20a, thereby reducing the difficulty of production during the production process, and improving the reliability of the battery cell during the operation of the battery cell.

[0036] In some embodiments of the present invention, the width of the sub-electrode tab 20a in the second direction is 20mm-50mm. For example, the width of the sub-electrode tab 20a in the second direction can be 20mm, 25mm, 31mm, 40mm or 50mm. Thus, the current capacity of the sub-electrode tab 20a can meet the working requirements of the electrode assembly 100. In the process of product design, the width of the sub-electrode tab 20a in the second direction can be adjusted to meet more product design requirements and reduce the difficulty of product design.

[0037] In some embodiments of the present invention, the width of the electrode assembly 100 in the second direction is 80 mm-350 mm. For example, the width of the electrode assembly 100 in the second direction can be 80 mm, 90 mm, 212 mm, 314 mm or 350 mm. During product design, the width of the electrode assembly 100 in the second direction can be adjusted to meet more product design requirements.

[0038] In some embodiments of the utility model, in the second direction, the spacing between the sub-pole ear 20a and the end edge of the pole group body 10 is not greater than 330 mm. For example, the spacing between the sub-pole ear 20a and the end edge of the pole group body 10 can be 1 mm, 5 mm, 100 mm, 210 mm or 330 mm. Thus, the coverage range of the pole ear 20 on the pole group body 10 can meet the use requirements. During the product design process, the spacing between the sub-pole ear 20a and the end edge of the pole group body 10 can be adjusted to meet more product design needs and reduce the difficulty of product design.

[0039] In some embodiments of the present invention, Figure 1-Figure 4 As shown, there are two pole tabs 20, namely a positive pole tab 21 and a negative pole tab 22. The positive pole tab 21 includes a plurality of positive sub-pole tabs 21a, for example, the positive pole tab 21 may include two, three or four positive sub-pole tabs 21a, and the negative pole tab 22 includes a plurality of negative sub-pole tabs 22a, for example, the negative pole tab 22 may include two, three or four negative sub-pole tabs 22a. The positive pole tab 21 and the negative pole tab 22 are respectively arranged on both sides of the pole group body 10 in the first direction. In this way, in the process of product design and production, there is no need to consider the interference between the positive pole tab 21 and the negative pole tab 22, which can reduce the difficulty of product design and production. In the normal operation of the electrode assembly 100, the positive pole tab 21 and the negative pole tab 22 will not overlap to produce a short circuit, thereby improving the reliability and safety of the battery cell.

[0040] The electrode assembly 100 includes a plurality of positive electrode sheets and a plurality of negative electrode sheets, wherein the positive electrode sheets include: a positive electrode sheet body and a positive electrode tab sheet, and the negative electrode sheets include: a negative electrode sheet body and a negative electrode tab sheet, wherein the positive electrode sheet body and the negative electrode sheet body are alternately stacked in the thickness direction of the electrode assembly 100, wherein the plurality of positive electrode tab sheets form a positive electrode tab 21, and the plurality of negative electrode tab sheets form a negative electrode tab 22. Thus, the arrangement of the positive electrode tab 21 and the negative electrode tab 22 on the electrode assembly 100 can be achieved.

[0041] During product design, parameters such as the number of positive electrode tabs 21a in the positive electrode tab 21, the number of negative electrode tabs 22a in the negative electrode tab 22, the number of positive electrode sheets or the number of negative electrode sheets can be adjusted to meet more product design needs.

[0042] In some embodiments of the present invention, a plurality of positive electrode sheets form a plurality of positive electrode sheet groups, the plurality of positive electrode sheet groups are arranged in sequence in the thickness direction of the electrode assembly 100, and the plurality of positive electrode tab sheets in the positive electrode sheet groups are stacked and arranged in the thickness direction of the electrode assembly 100 to form positive electrode sub-tabs 21a; a plurality of negative electrode sheets form a plurality of negative electrode sheet groups, the plurality of negative electrode sheet groups are arranged in sequence in the thickness direction of the electrode assembly 100, and the plurality of negative electrode tab sheets in the negative electrode sheet groups are stacked and arranged in the thickness direction of the electrode assembly 100 to form negative electrode sub-tabs 22a.

[0043] During the production process, multiple positive electrode tab sheets in the positive electrode sheet group are ultrasonically welded to form the positive electrode sub-tab 21a, and multiple positive electrode sub-tabs 21a are ultrasonically welded to form the positive electrode tab 21. Multiple negative electrode tab sheets in the negative electrode sheet group are ultrasonically welded to form the negative electrode sub-tab 22a, and multiple negative electrode sub-tabs 22a are ultrasonically welded to form the negative electrode tab 22. Thus, the production process of the positive electrode tab 21 and the negative electrode tab 22 is realized.

[0044] In some embodiments of the present invention, the electrode assembly 100 also includes multiple diaphragms, which are arranged between the positive electrode sheet body and the negative electrode sheet body. By setting the diaphragms, the diaphragms can insulate the positive electrode sheet body and the negative electrode sheet body, so that the electrode assembly 100 can normally realize the charging and discharging functions.

[0045] In some embodiments of the utility model, the number of positive electrode plate groups is 2-9. For example, the number of positive electrode plate groups can be 2, 5, 7, 8 or 9. During the product design process, the number of positive electrode plate groups can be adjusted to meet more product design needs.

[0046] In some embodiments of the present invention, the number of negative electrode plate groups is 2-9. For example, the number of negative electrode plate groups can be 2, 5, 7, 8 or 9. During the product design process, the number of negative electrode plate groups can be adjusted to meet more product design needs.

[0047] In some embodiments of the utility model, the number of positive electrode sheets in the positive electrode sheet group is 5-50. For example, the number of positive electrode sheets in the positive electrode sheet group can be 5, 10, 30, 38 or 50. During the product design process, the number of positive electrode sheets in the positive electrode sheet group can be adjusted to meet more product design needs.

[0048] In some embodiments of the utility model, the number of negative electrode sheets in the negative electrode sheet group is 5-50. For example, the number of negative electrode sheets in the negative electrode sheet group can be 5, 10, 30, 38 or 50. During the product design process, the number of negative electrode sheets in the negative electrode sheet group can be adjusted to meet more product design needs.

[0049] In some embodiments of the present invention, Figure 2-Figure 4 As shown, one end of the pole group body 10 in the second direction is the first end 11, and in the direction from one side to the other side in the thickness direction of the pole group body 10 (for example Figure 2 In the direction from top to bottom shown in FIG, the distances between the plurality of positive pole tabs 21a and the first end 11 are increased successively, and the distances between the plurality of negative pole tabs 22a and the first end 11 are increased successively, or, in the direction from one side toward the other side in the thickness direction of the pole group body 10 (for example, Figure 2 In the direction from top to bottom as shown in FIG, the distances between the plurality of positive pole tabs 21a and the first end 11 increase sequentially, and the distances between the plurality of negative pole tabs 22a and the first end 11 decrease sequentially.

[0050] That is to say, on the projection plane perpendicular to the first direction, the inclination direction of the projection of the positive pole ear 21 can be the same as the inclination direction of the projection of the negative pole ear 22, and the inclination direction of the projection of the positive pole ear 21 can also be opposite to the inclination direction of the projection of the negative pole ear 22. In the process of product design, the relationship between the changing law of the distance between the multiple positive pole sub-ears 21a and the first end 11 and the changing law of the distance between the multiple negative pole sub-ears 22a and the first end 11 can be adjusted to meet more product design needs.

[0051] A battery cell according to an embodiment of the second aspect of the present invention includes: the electrode assembly 100 according to the first aspect of the present invention.

[0052] According to the battery cell of the embodiment of the second aspect of the present invention, the yield rate can be improved by disposing the electrode assembly 100 according to the first aspect of the present invention.

[0053] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0054] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0055] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0056] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. 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 utility model. 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 may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0057] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. An electrode assembly, characterized in that: include: Ji group ontology; A pole ear, wherein the pole ear is arranged on at least one side of the pole group body in a first direction, and the pole ear comprises a plurality of sub-pole ears, and the plurality of sub-pole ears are arranged in sequence in the thickness direction of the pole group body, and in the thickness direction of the pole group body, two adjacent sub-pole ears are staggered in the second direction and overlapped, and the first direction, the second direction and the thickness direction of the pole group body are perpendicular to each other.

2. The electrode assembly according to claim 1, characterized in that: The overlapping width of two adjacent sub-electrode ears in the second direction is 3mm-8mm.

3. The electrode assembly according to claim 1, characterized in that: In a direction from one side toward the other side in the thickness direction of the pole group body, the plurality of sub-pole tabs are arranged in sequence along a second direction.

4. The electrode assembly according to claim 1, characterized in that: The width of the sub-electrode tab in the second direction is 20 mm-50 mm.

5. The electrode assembly according to claim 1, characterized in that: In the second direction, the distance between the sub-pole lug and the end edge of the pole group body is no more than 330 mm.

6. The electrode assembly according to any one of claims 1 to 5, characterized in that: There are two tabs, one is a positive tab and the other is a negative tab. The positive tab includes a plurality of positive tabs, and the negative tab includes a plurality of negative tabs. The positive tab and the negative tab are respectively arranged on both sides of the pole group body in the first direction. The electrode assembly includes a plurality of positive electrode sheets and a plurality of negative electrode sheets, wherein the positive electrode sheets include: a positive electrode sheet body and a positive electrode tab sheet, and the negative electrode sheets include: a negative electrode sheet body and a negative electrode tab sheet, The positive electrode sheet bodies and the negative electrode sheet bodies are alternately stacked in the thickness direction of the electrode assembly, a plurality of the positive electrode tab sheets form the positive electrode tab, and a plurality of the negative electrode tab sheets form the negative electrode tab.

7. The electrode assembly according to claim 6, characterized in that: The plurality of positive electrode sheets form a plurality of positive electrode sheet groups, the plurality of positive electrode sheet groups are arranged in sequence in the thickness direction of the electrode assembly, and the plurality of positive electrode tab sheets in the positive electrode sheet groups are stacked and arranged in the thickness direction of the electrode assembly to form the positive electrode tabs. The multiple negative electrode sheets form multiple negative electrode sheet groups, and the multiple negative electrode sheet groups are arranged in sequence in the thickness direction of the electrode assembly. The multiple negative electrode tab sheets in the negative electrode sheet groups are stacked in the thickness direction of the electrode assembly to form the negative electrode sub-tabs.

8. The electrode assembly according to claim 7, characterized in that: The number of the positive electrode sheets in the positive electrode sheet group is 5-50; and / or the number of the negative electrode sheets in the negative electrode sheet group is 5-50.

9. The electrode assembly according to claim 6, characterized in that: One side end of the pole group body in the second direction is the first end. In the direction from one side toward the other side in the thickness direction of the electrode group body, the distances between the plurality of positive electrode tabs and the first end increase successively, and the distances between the plurality of negative electrode tabs and the first end increase successively, or, In a direction from one side toward the other side in the thickness direction of the pole group body, the distances between the plurality of positive pole tabs and the first end increase successively, and the distances between the plurality of negative pole tabs and the first end decrease successively.

10. A battery cell, characterized in that: include: The electrode assembly according to any one of claims 1 to 9.

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