Electrode assembly and battery cell having same

Abstract

The utility model provides an electrode assembly and a battery monomer with the same. The electrode assembly comprises a plurality of pole pieces which are stacked along a first direction; the multiple diaphragms are arranged between every two adjacent pole pieces, in the second direction, lugs exceeding the pole pieces are formed at at least one end of each diaphragm, and the multiple lugs are stacked in the first direction and form extending ends located on at least one side of the multiple pole pieces in the second direction; the first direction intersects with the second direction. According to the electrode assembly disclosed by the utility model, the lugs are arranged on the diaphragm, the lugs can support the pole piece and prevent the pole piece from shaking in the shell, so that the pole piece can be protected, and meanwhile, a certain gap can be formed between the pole piece and the shell by the lugs, so that normal circulation of gas in the shell can be ensured.

Description

Technical Field

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

[0002] In the existing battery cell, after the pole piece is installed in the shell, there is a certain gap between the pole piece and the shell. When the battery cell is vibrated, the pole piece is prone to shake in the shell, which may cause damage to the pole piece. 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, which can prevent the pole piece from shaking in the housing.

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

[0005] According to the electrode assembly of the embodiment of the utility model, there are multiple pole pieces, and the multiple pole pieces are stacked along the first direction; there are multiple diaphragms, and the diaphragms are arranged between two adjacent pole pieces. In the second direction, at least one end of the diaphragm is formed with a lug extending beyond the pole piece. The multiple lugs are stacked in the first direction and formed as extended ends located on at least one side of the multiple pole pieces in the second direction, and the first direction intersects with the second direction.

[0006] According to the electrode assembly of the utility model, a lug is arranged on the diaphragm, which can provide support for the pole piece to prevent the pole piece from shaking in the shell, thereby protecting the pole piece. At the same time, the lug can form a certain gap between the pole piece and the shell, thereby ensuring that the gas in the shell can circulate normally.

[0007] According to some embodiments of the utility model, at least one lug is provided on one side of the diaphragm in the second direction. When there are multiple lugs, the multiple lugs are arranged at intervals along the third direction, and the multiple lugs of the multiple diaphragms are stacked to form multiple protruding ends arranged at intervals in the third direction; the first direction, the second direction and the third direction intersect each other.

[0008] According to some embodiments of the present invention, the lug is in a square or trapezoidal shape.

[0009] According to some embodiments of the present invention, the thickness of the extended end in the first direction is greater than or equal to one third of the total thickness of the pole piece and the diaphragm.

[0010] According to some embodiments of the present invention, the width of the lug in the third direction is greater than or equal to 5 mm, and the first direction, the second direction and the third direction intersect each other.

[0011] According to some embodiments of the present invention, the lugs are provided on both sides of the diaphragm in the second direction, and the lugs located on both sides of the diaphragm in the second direction are symmetrically arranged with respect to the length direction of the pole piece.

[0012] According to some embodiments of the present invention, the plurality of electrode sheets include a plurality of positive electrode sheets and a plurality of negative electrode sheets, the positive electrode sheets and the negative electrode sheets are alternately arranged in the first direction, and the diaphragm is disposed between adjacent positive electrode sheets and negative electrode sheets.

[0013] A battery cell according to an embodiment of the second aspect of the utility model comprises: a shell; and an electrode assembly according to the first aspect of the utility model, wherein the electrode assembly is disposed in the shell.

[0014] According to the battery cell of the utility model, by setting the electrode assembly of the first embodiment, a lug is set on the diaphragm, the lug can provide support for the pole piece to prevent the pole piece from shaking in the shell, thereby protecting the pole piece. At the same time, the lug can form a certain gap between the pole piece and the shell, thereby ensuring that the gas in the shell can circulate normally.

[0015] According to some embodiments of the present invention, the number of the electrode assemblies is one or more. When there are multiple electrode assemblies, the multiple electrode assemblies are arranged along the first direction, and the protruding ends of the multiple electrode assemblies are aligned in the second direction.

[0016] According to some embodiments of the present invention, in the second direction, the length of the electrode assembly is greater than the length of the shell, and the difference between the length of the electrode assembly and the length of the shell is greater than or equal to 0 mm and less than 6 mm.

[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 a battery cell at one angle according to an embodiment of the second aspect of the utility model;

[0019] Figure 2 is along Figure 1 Sectional view along line AA;

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

[0021] Figure 4 yes Figure 1 An exploded view of the electrode monomer shown in ;

[0022] Figure 5 yes Figure 4 Schematic diagram of the pole piece and diaphragm stack shown in .

[0023] Reference numerals:

[0024] 100. Electrode assembly;

[0025] 10. Pole sheet; 11. Positive electrode sheet; 12. Negative electrode sheet;

[0026] 20. diaphragm; 21. lug;

[0027] 200, housing;

[0028] 300, cover plate;

[0029] 1000. Battery cell. DETAILED DESCRIPTION

[0030] 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.

[0031] Please refer to the following Figure 1-Figure 5 An electrode assembly 100 according to an embodiment of the present invention is described.

[0032] Reference Figure 1 , Figure 4 and Figure 5 According to an embodiment of the present invention, the electrode assembly 100 includes: a plurality of pole pieces 10 and a plurality of diaphragms 20 .

[0033] Specifically, the plurality of pole pieces 10 are arranged along a first direction (eg Figure 4 The diaphragm 20 is arranged between two adjacent pole pieces 10, and the diaphragm 20 plays an insulating role for the two adjacent pole pieces 10. Figure 4In the left and right directions shown in the figure, at least one end of the diaphragm 20 is formed with a lug 21 extending beyond the pole piece 10, that is, the lug 21 extending beyond the pole piece 10 may be formed at one end of the diaphragm 20, or may be formed at both ends of the diaphragm 20. A plurality of lugs 21 are stacked in a first direction and formed as extended ends located on at least one side of a plurality of pole pieces 10 in a second direction, and the first direction intersects with the second direction.

[0034] For example, Figure 1 As shown, multiple pole pieces 10 are stacked in the front-to-back direction, and the diaphragm 20 is stacked between two adjacent pole pieces 10. Both ends of the diaphragm 20 are formed with lugs 21 extending beyond the pole pieces 10. The lug 21 at the left end of the diaphragm 20 extends to the left, and the lug 21 at the right end of the diaphragm 20 extends to the right.

[0035] The electrode assembly 100 of the utility model is provided with a lug 21 on the diaphragm 20. When the pole piece 10 is installed in the shell 200, the lug 21 can provide support for the pole piece 10, prevent the pole piece 10 from shaking in the shell 200, and effectively prevent the pole piece 10 from colliding with the inner wall of the shell 200 and being damaged, thereby protecting the pole piece 10. At the same time, the lug 21 is supported on the inner wall of the shell 200, so that a certain gap is formed between the pole piece 10 and the inner wall of the shell 200 at both ends in the first direction. When the battery cell 1000 is in thermal runaway, the gas in the shell 200 can be ensured to circulate normally. In addition, the diaphragm 20 can provide protection for the pole piece 10. In the process of installing the pole piece 10 in the shell, the shell 200 can be prevented from scratching the pole piece 10, thereby further protecting the pole piece 10.

[0036] According to the electrode assembly 100 of the embodiment of the utility model, a lug 21 is arranged on the diaphragm 20, and the lug 21 can provide support for the pole piece 10 to prevent the pole piece 10 from shaking in the shell 200, thereby protecting the pole piece 10. At the same time, the lug 21 can form a certain gap between the pole piece 10 and the shell 200, thereby ensuring that the gas in the shell 200 can circulate normally.

[0037] According to some embodiments of the present invention, referring to Figure 1 , Figure 4 and Figure 5 , the diaphragm 20 in the second direction (eg Figure 4 At least one lug 21 is provided on one side of the diaphragm 20 in the left and right directions (as shown in the figure), that is, the diaphragm 20 is provided with one, two, or three or more lugs 21 on one side or both sides in the first direction. When there are multiple lugs 21, the multiple lugs 21 are arranged along the third direction (as shown in the figure). Figure 4 The plurality of lugs 21 of the plurality of diaphragms 20 are stacked to form a plurality of extended ends that are spaced apart in the third direction; the first direction, the second direction and the third direction intersect each other.

[0038] In this way, multiple lugs 21 can provide multi-point support for the pole piece 10, thereby increasing the stability of the lugs 21 supporting the pole piece 10 and preventing the pole piece 10 from shaking when in the shell 200, thereby protecting the pole piece 10. At the same time, multiple lugs 21 of multiple diaphragms 20 are stacked to ensure the strength of the protruding end and prevent the protruding end from bending and affecting the effect of the lugs 21 supporting the pole piece 10.

[0039] According to some embodiments of the present invention, referring to Figure 3 and Figure 4 The shape of the lug 21 is square or trapezoidal. Therefore, the shape of the lug 21 can be adjusted according to actual conditions, and can be applicable to a variety of diaphragms 20, thereby improving the versatility of the diaphragm 20.

[0040] According to some embodiments of the present invention, referring to Figure 3 and Figure 4 , the extended end is in the first direction (such as Figure 4 The thickness of the extension end (in the front-to-back direction shown in FIG. 1 ) is greater than or equal to one third of the total thickness of the pole piece 10 and the diaphragm 20. Thus, the thickness of the extension end can be ensured to avoid the extension end being too thin to affect the supporting effect of the extension end.

[0041] For example, Figure 3 and Figure 4 As shown, the thickness of the protruding end in the first direction may be one third, one half, two thirds or five sixths of the total thickness of the diaphragm 20 .

[0042] According to some embodiments of the present invention, referring to Figure 3 and Figure 4 , the lug 21 is in the third direction (such as Figure 4 The width of the lug 21 in the vertical direction (shown in FIG. 1 ) is greater than or equal to 5 mm, and the first direction, the second direction and the third direction intersect each other. Thus, the width of the lug 21 can be ensured, and the width of the lug 21 can be prevented from being too narrow to affect the supporting effect, thereby further ensuring the supporting effect of the lug 21 on the pole piece 10.

[0043] For example, Figure 3 and Figure 4 As shown, the width of the lug 21 in the up-down direction may be 5 mm, 6 mm, 7 mm or 8 mm.

[0044] According to some embodiments of the present invention, referring to Figure 3 and Figure 4 , the diaphragm 20 in the second direction (eg Figure 4 Left and right directions as shown) on both sides (as shown Figure 4The left and right sides of the diaphragm 20 shown are both provided with lugs 21, and the lugs 21 located on both sides of the diaphragm 20 in the second direction are arranged symmetrically with respect to the length direction of the pole piece 10, and the length direction of the pole piece is the left-right direction.

[0045] In this way, it can be ensured that the lugs 21 on both sides of the diaphragm 20 can provide symmetrical support force to the pole piece 10, so as to prevent the pole piece 10 from tipping over or tilting in the housing 200, thereby ensuring the support effect of the lugs 21 on the pole piece 10, and at the same time, it can also ensure the gap between the pole piece 10 and the inner wall of the housing 200, and ensure the normal flow of gas in the housing 200. In addition, the centering limit of the protruding end to the pole piece 10 can be achieved, so as to ensure the gap between the two ends of the pole piece 10 in the second direction and the inner wall of the housing 200.

[0046] According to some embodiments of the present invention, referring to Figure 3 , Figure 4 and Figure 5 The plurality of electrode sheets 10 include a plurality of positive electrode sheets 11 and a plurality of negative electrode sheets 12. The positive electrode sheets 11 and the negative electrode sheets 12 are in a first direction (eg Figure 4 The positive electrode sheets 11 and the negative electrode sheets 12 are alternately arranged in the front-to-back direction (as shown in FIG. 1 ), and the separator 20 is disposed between adjacent positive electrode sheets 11 and negative electrode sheets 12.

[0047] Thus, the positive electrode sheet 11 and the negative electrode sheet 12 can form a normal operating circuit inside the battery cell 1000, thereby ensuring the normal operation of the battery cell 1000. At the same time, the diaphragm 20 is arranged between adjacent positive electrode sheets 11 and negative electrode sheets 12, thereby avoiding contact and short circuit between adjacent positive electrode sheets 11 and negative electrode sheets 12, thereby further ensuring the normal operation of the battery cell 1000.

[0048] According to the battery cell 1000 of the second embodiment of the utility model, refer to Figure 3 and Figure 4 , comprising: a shell 200 and the electrode assembly 100 of the first aspect of this embodiment, and the electrode assembly 100 is disposed in the shell 200.

[0049] According to the battery cell 1000 of the embodiment of the utility model, by setting the electrode assembly 100 of the first embodiment mentioned above, a lug 21 is set on the diaphragm 20, and the lug 21 can provide support for the pole piece 10 to prevent the pole piece 10 from shaking in the shell 200, thereby protecting the pole piece 10. At the same time, the lug 21 can form a certain gap between the pole piece 10 and the shell 200, thereby ensuring that the gas in the shell 200 can circulate normally.

[0050] According to some embodiments of the present invention, referring to Figure 1 , Figure 3 and Figure 4, the number of electrode assemblies 100 is one or more, that is, the number of electrode assemblies 100 can be one, two, or three or more. When there are multiple electrode assemblies 100, the multiple electrode assemblies 100 are arranged along the first direction (such as Figure 4 The extended ends of the plurality of electrode assemblies 100 are arranged in a second direction (such as Figure 4 align in the left and right directions as shown).

[0051] In this way, multiple electrode assemblies 100 can ensure the energy density inside the shell 200, and further ensure the energy storage capacity of the battery cell 1000. At the same time, the protruding ends of the multiple electrode assemblies 100 are aligned in the second direction, so that the structural arrangement of the electrode assembly 100 is reasonable, which facilitates the electrode assembly 100 to be installed into the shell 200.

[0052] For example, Figure 1 , Figure 3 and Figure 4 As shown, the number of electrode assemblies 100 is two, the two electrode assemblies 100 are arranged along the front-to-back direction, and the extended ends of the two electrode assemblies 100 are aligned in the left-to-right direction.

[0053] According to some embodiments of the present invention, referring to Figure 1 , Figure 3 and Figure 4 , in the second direction (such as Figure 4 In the left-right direction shown in the figure, the length of the electrode assembly 100 is greater than the length of the shell 200, and the difference between the length of the electrode assembly 100 and the length of the shell 200 is greater than or equal to 0 mm and less than 6 mm.

[0054] In this way, limiting the length of the protruding end can ensure the supporting effect of the protruding end. At the same time, the material of the protruding end is relatively soft. When the protruding end abuts against the inner wall of the shell 200, the protruding end can be appropriately compressed, thereby facilitating the electrode assembly 100 to be installed in the shell 200 and further ensuring the supporting effect of the protruding end.

[0055] For example, Figure 1 , Figure 3 and Figure 4 As shown, the difference between the length of the electrode assembly 100 and the length of the shell 200 can be: 0 mm, 1 mm, 2 mm, 3 mm, 4 mm, 5 mm or 6 mm.

[0056] According to some embodiments of the present invention, referring to Figure 1 , Figure 3 and Figure 4The battery cell 1000 further includes a cover plate 300. The upper side of the shell 200 is opened to form an open opening, and the cover plate 300 is arranged to cover the open opening. Thus, the electrode assembly 100 can be loaded into the shell 200 from the open opening, which facilitates the installation of the electrode assembly 100. At the same time, the cover plate 300 can form a closed cavity with the shell 200, thereby protecting the electrode assembly 100.

[0057] 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.

[0058] 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.

[0059] 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.

[0060] 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.

[0061] 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: A plurality of pole pieces, wherein the plurality of pole pieces are stacked and arranged along a first direction; A plurality of diaphragms are arranged between two adjacent pole pieces, and in the second direction, at least one end of the diaphragm is formed with a lug extending beyond the pole piece, and the plurality of lugs are stacked in the first direction and formed as extended ends located on at least one side of the plurality of pole pieces in the second direction, and the first direction intersects with the second direction.

2. The electrode assembly according to claim 1, characterized in that: The diaphragm is provided with at least one lug on one side in the second direction. When there are multiple lugs, the multiple lugs are arranged at intervals along the third direction, and the multiple lugs of the multiple diaphragms are stacked to form multiple protruding ends arranged at intervals in the third direction; the first direction, the second direction and the third direction intersect each other.

3. The electrode assembly according to claim 1, characterized in that: The lug is in a square or trapezoidal shape.

4. The electrode assembly according to claim 1, characterized in that: The thickness of the extended end in the first direction is greater than or equal to one third of the total thickness of the pole piece and the diaphragm.

5. The electrode assembly according to claim 1, characterized in that: The width of the lug in the third direction is greater than or equal to 5 mm, and the first direction, the second direction and the third direction intersect each other.

6. The electrode assembly according to claim 1, characterized in that: The diaphragm is provided with lugs on both sides in the second direction, and the lugs on both sides of the diaphragm in the second direction are symmetrically arranged with respect to the length direction of the pole piece.

7. The electrode assembly according to claim 1, characterized in that: The plurality of electrode sheets include a plurality of positive electrode sheets and a plurality of negative electrode sheets. The positive electrode sheets and the negative electrode sheets are arranged alternately in the first direction. The separator is disposed between adjacent positive electrode sheets and negative electrode sheets.

8. A battery cell, characterized in that: include: case; The electrode assembly according to any one of claims 1-7, wherein the electrode assembly is disposed in the shell.

9. The battery cell according to claim 8, characterized in that: The number of the electrode assemblies is one or more. When there are multiple electrode assemblies, the multiple electrode assemblies are arranged along the first direction, and the protruding ends of the multiple electrode assemblies are aligned in the second direction.

10. The battery cell according to claim 8, characterized in that: In the second direction, the length of the electrode assembly is greater than the length of the shell, and the difference between the length of the electrode assembly and the length of the shell is greater than or equal to 0 mm and less than 6 mm.

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