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 a plurality of pole pieces which are arranged in a laminated manner along the thickness direction of the pole pieces; each diaphragm piece is arranged between every two adjacent pole pieces, each pole piece is provided with a first edge and a second edge which are connected, the first edge extends in the first direction, and the second edge obliquely extends relative to the first edge. According to the electrode assembly and the battery monomer with the electrode assembly, the electrode pieces and the diaphragm pieces are arranged, the electrode pieces are stacked in the thickness direction, each electrode piece is provided with the first edge and the second edge which are connected, and the second edge obliquely extends relative to the first edge, so that the surface area of the electrode assembly can be well increased under the condition that the volume of the electrode assembly is not changed; therefore, the heat dissipation area of the electrode assembly is larger, and the battery monomer can have a better heat dissipation effect.

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] When the battery cell is dissipating heat, the electrode assembly in the battery cell exchanges heat with the battery cell shell through its outer surface, and the battery cell shell then exchanges heat with the external environment or cooling structure to perform heat dissipation operations. However, the area of ​​the outer surface of the electrode assembly is small, so the heat dissipation area of ​​the electrode assembly and the shell is small, resulting in poor heat dissipation effect of the battery cell. 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 proposes an electrode assembly, which can increase the area of ​​the outer surface, thereby increasing the heat dissipation area between the electrode assembly and the outside, thereby enabling the battery cell to have a better heat dissipation effect.

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

[0005] The electrode assembly according to the first aspect of the utility model includes: a pole piece, wherein a plurality of the pole pieces are provided, and the plurality of the pole pieces are stacked along the thickness direction of the pole piece; a diaphragm sheet, wherein the diaphragm sheet is provided between two adjacent pole pieces, wherein the pole piece has a first edge and a second edge connected to each other, the first edge extends along a first direction, and the second edge extends obliquely relative to the first edge.

[0006] According to the electrode assembly of the utility model, by setting pole pieces and diaphragm pieces, the pole pieces are stacked in the thickness direction, and the pole pieces have a first side and a second side connected to each other, and the second side extends obliquely relative to the first side, so that the surface area of ​​the electrode assembly can be well increased without changing the volume, thereby making the heat dissipation area of ​​the electrode assembly larger, and further making the battery cell have a better heat dissipation effect.

[0007] In some embodiments of the present invention, in a projection plane perpendicular to the thickness direction of the pole piece, the projection of the pole piece is a parallelogram.

[0008] In some embodiments of the utility model, in the first direction, the diaphragm has a redundant portion extending beyond the electrode plate, and a tear line is provided on the diaphragm, and the tear line extends along the extension direction of the second edge. The diaphragm is configured to remove the redundant portion through the tear line after the electrode assembly is hot pressed.

[0009] In an embodiment of the present invention, the easy tear line is arranged on the outer side of the pole piece in the first direction, and the easy tear line is arranged parallel to the second side.

[0010] In one embodiment of the present invention, the easy tear line has a plurality of point pressing portions and / or line pressing portions, and the plurality of point pressing portions and / or line pressing portions are arranged at intervals along the extending direction of the easy tear line.

[0011] In one embodiment of the present invention, the tear line extends to both side edges of the diaphragm sheet in a second direction, and the second direction is perpendicular to the first direction.

[0012] In an embodiment of the present invention, two easy-tear lines are provided, and in the first direction, the pole piece is provided between the two easy-tear lines.

[0013] In one embodiment of the present invention, the electrode assembly further comprises an adhesive, and the adhesive is configured to bond and fix the plurality of electrode sheets to the diaphragm sheet after the redundant portion of the diaphragm sheet is removed.

[0014] In some embodiments of the present invention, the electrode sheet includes a positive electrode sheet and a negative electrode sheet, the positive electrode sheet is provided with a positive electrode ear, the negative electrode sheet is provided with a negative electrode ear, and the positive electrode ear and the negative electrode ear are arranged on one side or both sides of the electrode sheet in the second direction.

[0015] The battery cell according to the second aspect of the present invention comprises a shell and an electrode assembly according to the first aspect of the present invention, wherein the shell has a receiving cavity, the electrode assembly is arranged in the receiving cavity, and the receiving cavity of the shell matches the shape of the electrode assembly.

[0016] According to the battery cell of the utility model, by setting the electrode assembly of the first aspect mentioned above, by setting the pole pieces and the diaphragm pieces, the pole pieces are stacked in the thickness direction, the pole pieces have a first side and a second side connected to each other, and the second side extends obliquely relative to the first side, so that the surface area of ​​the electrode assembly can be well increased without changing the volume, thereby making the heat dissipation area of ​​the electrode assembly larger, and further making the battery cell have a better heat dissipation effect.

[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 according to an embodiment of the utility model;

[0019] Figure 2 is a schematic diagram of an electrode assembly according to an embodiment of the utility model;

[0020] Figure 3 It is a schematic diagram of an electrode assembly after the redundant portion of the diaphragm sheet according to an embodiment of the utility model is removed.

[0021] Reference numerals:

[0022] 10. Electrode assembly;

[0023] 11, pole piece; 111, positive pole piece; 1111, positive pole ear; 112, negative pole piece; 1121, negative pole ear; 1101, first side; 1102, second side;

[0024] 12. diaphragm; 121. tear line; 122. redundant part;

[0025] 20. Shell;

[0026] 100. Battery cell. DETAILED DESCRIPTION

[0027] 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.

[0028] Reference below Figure 1-Figure 3 An electrode assembly 10 according to an embodiment of the first aspect of the present invention is described.

[0029] like Figure 2 and Figure 3 As shown, according to the first embodiment of the utility model, the electrode assembly 10 includes: a pole piece 11 and a diaphragm sheet 12, wherein the pole piece 11 is provided with a plurality of pole pieces 11, and the plurality of pole pieces 11 are stacked along the thickness direction of the pole piece 11; the diaphragm sheet 12 is provided between two adjacent pole pieces 11, wherein the pole piece 11 has a first side 1101 and a second side 1102 connected to each other, and the first side 1101 is along a first direction (such as Figure 2 The second side 1102 extends in an inclined direction relative to the first side 1101.

[0030] In this embodiment, a pole piece 11 and a diaphragm sheet 12 are provided, and the diaphragm sheet 12 is provided between two adjacent pole pieces 11 which are stacked, so that the pole piece 11 and the diaphragm sheet 12 can well meet the use requirements of the electrode assembly 10 .

[0031] In this embodiment, the pole piece 11 is provided with a first edge 1101 and a second edge 1102, where the first edge 1101 and the second edge 1102 refer to the end faces of the pole piece 11 in the circumferential direction, and the first edge 1101 is connected to the second edge 1102. Specifically, one end of the first edge 1101 in the first direction is connected to one end of the second edge 1102 in the extension direction thereof. Figure 2 As shown, the second side 1102 extends obliquely relative to the first side 1101 , that is, the second side 1102 and the first side 1101 may form a non-right angle.

[0032] It is understandable that the pole piece 11 is generally a rectangular piece structure. Figure 2 and Figure 3 As shown, the first side 1101 of the rectangular sheet is arranged perpendicular to the second side 1102, and the second side 1102 can be arranged along a second direction perpendicular to the first direction (eg Figure 2 In the case where the volume of the pole piece 11 remains unchanged, illustratively, when the length of the first side 1101 of the pole piece 11, the thickness of the pole piece 11 and the width of the pole piece 11 in the second direction remain the same, the length of the second side 1102 in this embodiment is greater than the length of the second side extending linearly along the second direction in the rectangular sheet structure, thereby increasing the surface area of ​​the pole piece 11 on the second side 1102 in this embodiment, thereby increasing the area of ​​the outer surface formed on the second side 1102 of the pole piece 11 of the electrode assembly 10 composed of multiple pole pieces 11 stacked along the thickness direction thereof, that is, the electrode assembly 10 can have a larger heat dissipation surface while having the same volume, thereby allowing the battery cell 100 to have a better heat dissipation effect.

[0033] According to the electrode assembly 10 of the embodiment of the utility model, by setting the pole piece 11 and the diaphragm sheet 12, the pole piece 11 is stacked in the thickness direction, and the pole piece 11 has a first edge 1101 and a second edge 1102 connected to each other, and the second edge 1102 extends obliquely relative to the first edge 1101, so that the surface area of ​​the electrode assembly 10 can be well increased without changing the volume, thereby making the heat dissipation area of ​​the electrode assembly 10 larger, and further making the battery cell 100 have a better heat dissipation effect.

[0034] In some embodiments of the present invention, Figure 2 and Figure 3 As shown, in the projection plane perpendicular to the thickness direction of the pole piece 11, the projection of the pole piece 11 can be a parallelogram.

[0035] In this embodiment, the projection of the pole piece 11 is a parallelogram, and the pole piece 11 may have two first sides 1101 arranged in parallel, and two second sides 1102 arranged in parallel. Specifically, the areas of the two first sides 1101 may be the same, and the areas of the two second sides 1102 may be the same. In this embodiment, the pole piece 11 is set as a parallelogram structure, which has a simple structure and is convenient for die-cutting of the pole piece 11 during the production process. The surface area of ​​the pole piece 11 on the second side 1102 can be further increased relative to the rectangular sheet structure, so that the electrode assembly 10 can have a larger heat dissipation area, and the heat dissipation effect of the battery cell 100 can be further improved.

[0036] In some embodiments of the present invention, Figure 2 As shown, in the first direction, the diaphragm 12 may have a redundant portion 122 extending beyond the electrode 11, and a tear line 121 is provided on the diaphragm 12, and the tear line 121 extends along the extension direction of the second edge 1102. The diaphragm 12 is configured to remove the redundant portion 122 through the tear line 121 after the electrode assembly 10 is hot pressed.

[0037] It can be understood that in the related art, when the pole pieces 11 and the diaphragms of the electrode assembly 10 are stacked, the diaphragms are generally stacked in a Z-shaped manner with the multiple pole pieces 11 formed after die-cutting to form staggered stacked pole pieces 11 and diaphragm pieces 12, and the formed diaphragm pieces 12 are of a rectangular structure. When the pole pieces 11 adopt a conventional rectangular structure, the diaphragm pieces 12 can well match the shape of the pole pieces 11 to cover and separate adjacent pole pieces 11.

[0038] In this embodiment, Figure 2 As shown, the pole piece 11 can adopt a parallelogram structure, and the rectangular diaphragm sheet 12 cannot cooperate well with the pole piece 11. Therefore, after the diaphragm sheet 12 is laminated with the pole piece 11, a large portion of the pole piece 11 is protruded, thereby forming a redundant portion 122. The redundant portion 122 needs to be removed so that the pole piece 11 and the diaphragm sheet 12 can cooperate well to form the electrode assembly 10. The redundant portion 122 on the diaphragm sheet 12 is difficult to remove.

[0039] In this embodiment, an easy-tear line 121 is provided on the diaphragm sheet 12. When the redundant portion 122 on the diaphragm sheet 12 in the electrode assembly 10 is removed, the electrode assembly 10 is hot pressed as a whole. Specifically, when the electrode assembly 10 is hot pressed, the stacked pole piece 11 and the non-redundant portion of the diaphragm sheet 12 in the electrode assembly 10 can be hot pressed as a whole first, and the redundant portion 122 of the diaphragm sheet 12 can be hot pressed as a whole. The stacked pole piece 11 and the diaphragm sheet 12 in the electrode assembly 10 can also be hot pressed as a whole. After the pole piece 11 and the diaphragm are hot pressed, the production personnel can tear off the redundant portion 122 of the diaphragm sheet 12 from the electrode assembly 10 along the easy-tear line 121 as a whole, and the production personnel can also use a cutting tool to cut along the easy-tear line 121, so that the redundant portion 122 is removed from the electrode assembly 10.

[0040] The tear line 121 refers to a series of small continuous or spaced indentations, circular holes or cutting lines pre-designed and processed on the diaphragm sheet 12. The structural strength of the diaphragm sheet 12 at the tear line 121 is relatively weak. The tear line 121 provided in this embodiment can make the diaphragm sheet 12 relatively stable and reliable to break along the tear line 121 under the action of external force, so that the redundant part 122 can be easily and reliably separated from the diaphragm sheet 12, and the diaphragm sheet 12 can form a relatively neat edge, so that the diaphragm sheet 12 can be well matched with the pole piece 11. The tear line 121 can play the role of a positioning mark, so that the pole piece 11 and the diaphragm sheet 12 can be well aligned with the tear line 121 during the lamination process, so that the electrode assembly 10 is more stable and reliable during the production process.

[0041] In one embodiment of the present invention, Figure 2 As shown, the easy tear line 121 can be arranged outside the pole piece 11 in the first direction, and the easy tear line 121 is arranged parallel to the second edge 1102 .

[0042] In the present embodiment, the tear line 121 is arranged on the outside of the pole piece 11 in the first direction and parallel to the second edge 1102. The structure is simple, and the shape of the diaphragm sheet 12 after removing the redundant portion 122 along the tear line 121 can be well adapted to the pole piece 11, thereby well meeting the production and processing needs of the electrode assembly 10, and a certain gap can be left between the edge of the diaphragm sheet 12 formed at the tear line 121 and the second edge 1102 of the pole piece 11, so that the diaphragm sheet 12 can reliably separate the adjacent pole pieces 11.

[0043] In one embodiment of the present invention, reference Figure 2 As shown, the easy tear line 121 may have a plurality of point pressing portions and / or line pressing portions, and the plurality of point pressing portions and / or line pressing portions are arranged at intervals along the extending direction of the easy tear line 121 .

[0044] The tear line 121 has multiple point pressure parts and / or line pressure parts. Specifically, the tear line 121 can be pressed out by pressure to form a series of spaced dot-shaped, line-shaped, or dot-shaped and line-shaped indentations. The tear line 121 can also be processed by laser to form a series of spaced dot-shaped holes, line-shaped holes, or dot-shaped holes and line-shaped holes.

[0045] In this embodiment, the tear line 121 has multiple point pressure parts and / or line pressure parts, which can effectively reduce the structural strength of the diaphragm sheet 12 at the tear line 121, facilitate the separation of the redundant part 122 from the diaphragm sheet 12, and has a simple structure and good use effect.

[0046] In one embodiment of the present invention, Figure 2 As shown, the tear line 121 can extend to both side edges of the diaphragm sheet 12 in the second direction, and the second direction is perpendicular to the first direction.

[0047] In this embodiment, the tear line 121 is set to extend to the edges of both sides of the diaphragm 12 in the second direction, so that the redundant part 122 can be separated from the diaphragm 12 along the tear line 121 on both sides of the second direction, so that the redundant part 122 can be more conveniently and effectively removed from the diaphragm 12, with a simple structure and easy use.

[0048] In one embodiment of the present invention, Figure 2 As shown, two easy-tear lines 121 may be provided, and in the first direction, the pole piece 11 is provided between the two easy-tear lines 121 .

[0049] When the redundant portion 122 is removed from the diaphragm sheet 12, the redundant portions 122 located on both sides of the pole piece 11 in the first direction can be removed from the diaphragm sheet 12 along the tear lines 121, thereby making the redundant portions 122 more efficient when removed. The two tear lines 121 can better position and identify the pole piece 11 and the diaphragm sheet 12 during the lamination process, so that the diaphragm sheet 12 and the pole piece 11 can have better alignment after lamination.

[0050] In one embodiment of the present invention, the electrode assembly 10 may further include an adhesive, which is configured to bond and fix the plurality of electrode sheets 11 to the diaphragm sheet 12 after the redundant portion 122 of the diaphragm sheet 12 is removed.

[0051] It is understandable that when the redundant part 122 is removed along the tear line 121 of the diaphragm sheet 12, the redundant part 122 forms a certain force at the position of the tear line 121, so that the edge formed at the tear line 121 of the multi-layer diaphragm sheet 12 after hot pressing is easy to spread and warp. In this embodiment, an adhesive is provided to bond and fix the electrode sheet 11 to the diaphragm. Specifically, the adhesive can bond and fix multiple electrode sheets 11 and multiple diaphragm sheets 12 at the second edge 1102 of the electrode sheet 11 along the stacking direction of the electrode sheet 11 and the diaphragm sheet 12, so that the electrode sheet 11 and the diaphragm sheet 12 are fixed more firmly and stably at the edge, thereby facilitating the arrangement and use of the electrode assembly 10 in the battery cell 100. Preferably, the adhesive is a tape.

[0052] In some embodiments of the present invention, Figure 2 As shown, the electrode sheet 11 includes a positive electrode sheet 111 and a negative electrode sheet 112. The positive electrode sheet 111 is provided with a positive electrode ear 1111, and the negative electrode sheet 112 is provided with a negative electrode ear 1121. The positive electrode ear 1111 and the negative electrode ear 1121 are arranged on one side or both sides of the electrode sheet 11 in the second direction.

[0053] In this embodiment, the positive electrode ear 1111 and the negative electrode ear 1121 are arranged on one side or both sides of the electrode sheet 11 in the second direction. For example, the positive electrode ear 1111 can be arranged on one side of the electrode sheet 11 in the second direction, and the negative electrode ear 1121 can be arranged on the other side of the electrode sheet 11 in the second direction, or the positive electrode ear 1111 and the negative electrode ear 1121 are arranged on the same side of the electrode sheet 11 in the second direction. The arrangement of the positive electrode ear 1111 and the negative electrode ear 1121 in the second direction of the electrode sheet 11 in this embodiment can be reasonably arranged according to the connection arrangement requirements of the electrode assembly 10 and the electrical connector in the battery cell 100.

[0054] In this embodiment, the electrode sheet 11 is provided with a positive electrode sheet 111 and a negative electrode sheet 112. Specifically, the diaphragm sheet 12 is arranged between adjacent positive electrode sheets 111 and negative electrode sheets 112 to play a separating role. The positive electrode sheet 111 is provided with a positive electrode ear 1111, which can facilitate the electrical connection between the positive electrode sheet 111 and the electrical connection structure of the battery cell 100. The negative electrode sheet 112 is provided with a negative electrode ear 1121, which can facilitate the electrical connection between the negative electrode sheet 112 and the electrical connection structure of the battery cell 100.

[0055] Reference below Figure 1-Figure 3 A battery cell 100 according to an embodiment of the second aspect of the present invention is described.

[0056] refer to Figure 1 As shown, the battery cell 100 according to an embodiment of the utility model includes a shell 20 and an electrode assembly 10 according to an embodiment of the first aspect of the utility model. The shell 20 has a accommodating cavity, and the electrode assembly 10 is arranged in the accommodating cavity. The accommodating cavity of the shell 20 matches the shape of the electrode assembly 10.

[0057] In the present embodiment, a shell 20 is provided, and the electrode assembly 10 is provided in a receiving cavity of the shell 20, and the receiving cavity is matched with the shape of the electrode assembly 10. The electrode assembly 10 is composed of a plurality of electrode sheets 11 and diaphragm sheets 12 arranged in a stacked manner. The electrode sheets 11 are formed into a parallelogram structure and are stacked in the thickness direction, so that the overall structure of the electrode assembly 10 is formed into a parallelogram-shaped cubic structure in a projection plane perpendicular to the thickness direction of the electrode sheets 11. In the present embodiment, the shape of the receiving cavity is matched with the shape of the electrode assembly 10, so that the larger heat dissipation surface formed by the electrode assembly 10 can cooperate well with the inner wall surface of the shell 20 for heat exchange, so that the battery cell 100 can have a better heat dissipation effect.

[0058] Other structures and operations of the battery cell 100 according to the embodiment of the present invention are known to those skilled in the art and will not be described in detail here.

[0059] According to the battery cell 100 of the embodiment of the utility model, by setting the electrode assembly 10 of the above-mentioned first aspect embodiment, the electrode assembly 10 is provided with a pole piece 11 and a diaphragm piece 12, and the pole piece 11 is stacked in the thickness direction, and the pole piece 11 has a first edge 1101 and a second edge 1102 connected to each other, and the second edge 1102 extends obliquely relative to the first edge 1101, so that the surface area of ​​the electrode assembly 10 can be well increased without changing the volume, thereby making the heat dissipation area of ​​the electrode assembly 10 larger, and then the battery cell 100 can have a better heat dissipation effect.

[0060] The following will refer to Figure 1-Figure 3 A battery cell 100 according to a specific embodiment of the present invention is described.

[0061] like Figure 1-Figure 3 As shown, the battery cell 100 includes a shell 20 and an electrode assembly 10 . The shell 20 has a receiving cavity. The electrode assembly 10 is disposed in the receiving cavity. The shape of the receiving cavity is consistent with the overall shape of the electrode assembly 10 .

[0062] The electrode assembly 10 includes a pole piece 11, a diaphragm sheet 12 and an adhesive, wherein the adhesive is an adhesive tape. The pole piece 11 includes a positive pole piece 111 and a negative pole piece 112, and the diaphragm sheet 12 is stacked between adjacent positive pole pieces 111 and negative pole pieces 112. The positive pole piece 111 forms a positive pole ear 1111 on one side of the second direction, and the negative pole piece 112 forms a negative pole ear 1121 on the same side of the second direction. The pole piece 11 is provided with a plurality of pole pieces and is stacked and arranged alternately with a plurality of diaphragm sheets 12 in the thickness direction. The pole piece 11 is a parallelogram structure, and the pole piece 11 has a first side 1101 on both sides of the second direction, and the pole piece 11 has a second side 1102 on both sides of the first direction. The first side 1101 extends along the first direction, and the second side 1102 extends obliquely along the second direction. The first side 1101 is connected to the second side 1102 and forms a non-right angle.

[0063] The diaphragm sheet 12 is provided with an easy-tear line 121. Two easy-tear lines 121 are provided and are respectively located on both sides of the pole piece 11 in the first direction. The easy-tear lines 121 extend along the extension direction of the second edge 1102 to the edges of the diaphragm sheet 12 on both sides in the second direction. The easy-tear lines 121 are arranged parallel to the second edge 1102. In the first direction, the diaphragm sheet 12 forms a redundant portion 122 on the side of the easy-tear line 121 away from the pole piece 11.

[0064] During the production and processing of the battery cell 100, the pole piece 11 and the diaphragm sheet 12 are stacked. During the stacking process, the pole piece 11 and the diaphragm sheet 12 can be aligned according to the tear line 121. After the stacking is completed, the pole piece 11 and the diaphragm sheet 12 are hot pressed as a whole. After hot pressing, the production personnel remove the redundant part 122 of the diaphragm sheet 12 as a whole along the tear line 121. The diaphragm sheet 12 forms an edge that fits well with the pole piece 11 at the second side 1102 of the pole piece 11. The production personnel use tape to stick the pole piece 11 and the diaphragm sheet 12 together at the second side 1102. The electrode assembly 10 is then assembled with the cover plate, electrical connectors, etc. of the battery cell 100 and placed in the accommodating cavity of the shell 20 for assembly, thereby completing the assembly of the electrode assembly 10 in the battery cell 100.

[0065] According to the battery cell 100 of the embodiment of the utility model, by arranging the pole piece 11 and the diaphragm sheet 12 in the electrode assembly 10, the pole piece 11 is stacked in the thickness direction, and the pole piece 11 has a first edge 1101 and a second edge 1102 connected to each other, and the second edge 1102 extends obliquely relative to the first edge 1101, so that the surface area of ​​the electrode assembly 10 can be well increased without changing the volume, thereby making the heat dissipation area of ​​the electrode assembly 10 larger, and further making the battery cell 100 have a better heat dissipation effect.

[0066] 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.

[0067] 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.

[0068] 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.

[0069] 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.

[0070] 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 pole piece, wherein a plurality of pole pieces are provided, and the plurality of pole pieces are stacked and arranged along the thickness direction of the pole piece; A diaphragm sheet is provided between two adjacent pole sheets, wherein the pole sheet has a first side and a second side connected to each other, the first side extends along a first direction, and the second side extends obliquely relative to the first side.

2. The electrode assembly according to claim 1, characterized in that: In a projection plane perpendicular to the thickness direction of the pole piece, the projection of the pole piece is a parallelogram.

3. The electrode assembly according to claim 1, characterized in that: In the first direction, the diaphragm has a redundant portion extending beyond the electrode plate, and a tear line is provided on the diaphragm, the tear line extends along the extension direction of the second edge, and the diaphragm is configured to remove the redundant portion through the tear line after hot pressing of the electrode assembly.

4. The electrode assembly according to claim 3, characterized in that: The easy tear line is arranged on the outer side of the pole piece in the first direction, and the easy tear line is arranged parallel to the second side.

5. The electrode assembly according to claim 3, characterized in that: The easy tear line has a plurality of point pressing portions and / or line pressing portions, and the plurality of point pressing portions and / or line pressing portions are arranged at intervals along the extending direction of the easy tear line.

6. The electrode assembly according to claim 3, characterized in that: The tear line extends to both side edges of the diaphragm sheet in a second direction, and the second direction is perpendicular to the first direction.

7. The electrode assembly according to any one of claims 3 to 6, characterized in that: There are two easy-tear lines, and in the first direction, the pole piece is arranged between the two easy-tear lines.

8. The electrode assembly according to any one of claims 3 to 6, characterized in that: The electrode assembly further includes an adhesive configured to bond and fix the plurality of electrode sheets to the diaphragm sheet after the redundant portion of the diaphragm sheet is removed.

9. The electrode assembly according to claim 1, characterized in that: The electrode sheet comprises a positive electrode sheet and a negative electrode sheet, the positive electrode sheet is provided with a positive electrode ear, the negative electrode sheet is provided with a negative electrode ear, and the positive electrode ear and the negative electrode ear are arranged on one side or both sides of the electrode sheet in the second direction.

10. A battery cell, characterized in that: It comprises a shell and an electrode assembly according to any one of claims 1 to 9, wherein the shell has a receiving cavity, the electrode assembly is arranged in the receiving cavity, and the receiving cavity of the shell matches the shape of the electrode assembly.

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