Battery cell and battery pack

Abstract

The utility model discloses a battery cell and a battery pack, the battery cell comprises a shell, one side of the shell is opened to form an opening, one side of the shell opposite to the opening is a bottom wall, and one or more spaced bulges are arranged on the inner surface of the bottom wall; the cover plate assembly is arranged at the opening; and the pole group is arranged in the shell. According to the battery cell disclosed by the utility model, the exhaust of the pole group is smooth, so that the safety of the battery cell is improved, the arrangement of a bottom supporting plate is reduced, the structure is simplified, the cost of the battery cell is reduced, and the weight of the battery cell is also reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of battery packs, in particular to a battery core and a battery pack. Background Art

[0002] A bottom support plate is placed between the bottom pole group and the shell of a traditional battery to prevent the bottom corners of the pole group from interfering with the inner corners of the shell when the battery cell is placed upright. However, when the battery cell produces gas and releases energy, the bottom support plate area blocks the space between the pole group and the shell, affecting the smooth flow of the exhaust reflux channel inside the battery cell, thereby affecting the safety of the battery cell. In addition, the setting of the bottom support plate increases the cost and weight 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 provides a battery cell, which allows the exhaust of the pole group to be unobstructed, thereby improving the safety of the battery cell. The arrangement of the bottom support plate is reduced, thereby simplifying the structure, reducing the cost of the battery cell and also reducing the weight of the battery cell.

[0004] The utility model also provides a battery pack, comprising the above-mentioned battery cell.

[0005] The battery cell according to the embodiment of the utility model includes: a shell, one side of the shell is open to form an open opening, the side of the shell opposite to the open opening is a bottom wall, and one or more spaced protrusions are provided on the inner surface of the bottom wall; a cover plate assembly, the cover plate assembly is arranged at the open opening; and a pole group, the pole group is arranged in the shell.

[0006] According to the battery cell of the embodiment of the utility model, one side of the shell is opened to form an open opening, the side of the shell opposite to the open opening is a bottom wall, and one or more spaced protrusions are arranged on the inner surface of the bottom wall; the cover plate assembly is arranged at the open opening; the electrode group is arranged in the shell. Thus, the exhaust of the electrode group is unobstructed, thereby improving the safety of the battery cell. In addition, the arrangement of the bottom support plate is reduced, thereby simplifying the structure, reducing the cost of the battery cell and also reducing the weight of the battery cell.

[0007] In some embodiments of the present invention, the protrusions are multiple and spaced apart along the length direction of the bottom wall.

[0008] In some embodiments of the present invention, in the length direction of the bottom wall, the distance between two adjacent protrusions is e, the length of the pole group is L, and the following condition is satisfied: L>e≥L / 4.

[0009] In some embodiments of the present invention, the outer contour of the cross section of the protrusion is circular, the distance between two inner walls of the shell facing each other along the width direction of the bottom wall is m, the diameter of the protrusion is d, 5≤d≤m-5.

[0010] In some embodiments of the present invention, the outer contour of the cross section of the protrusion is a polygon, the distance between the two inner walls of the shell opposite to each other along the width direction of the bottom wall is m, the diameter of the inscribed circle of the polygon is d, 5≤d≤m-5.

[0011] In some embodiments of the present invention, a groove is provided on the outer surface of the bottom wall at a position opposite to the protrusion.

[0012] In some embodiments of the present invention, a portion of the outer surface of the bottom wall opposite to the protrusion is flush with the remaining portion.

[0013] In some embodiments of the present invention, the wall thickness of the bottom wall where the protrusion is provided is a, and the minimum wall thickness of the two side walls of the shell that are oppositely arranged along the width direction of the bottom wall is b, and a≥b.

[0014] In some embodiments of the present invention, the height of the protrusion is h, and h≥0.2 mm.

[0015] A battery pack according to an embodiment of the present invention includes the above-mentioned battery cell.

[0016] According to the battery pack of the embodiment of the utility model, by setting the above-mentioned battery cell, one side of the shell is opened to form an open opening, the side of the shell opposite to the open opening is a bottom wall, and one or more spaced protrusions are arranged on the inner surface of the bottom wall; the cover plate assembly is arranged at the open opening; the electrode group is arranged in the shell. Thus, the exhaust of the electrode group is unobstructed, thereby improving the safety of the battery cell. And the setting of the bottom support plate is reduced, thereby simplifying the structure, reducing the cost of the battery cell and also reducing the weight of the battery cell.

[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] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0019] Figure 1 is an exploded view of a battery cell according to an embodiment of the utility model;

[0020] Figure 2 is a top view of a battery cell according to an embodiment of the utility model;

[0021] Figure 3 is a cross-sectional view of a battery cell according to an embodiment of the utility model;

[0022] Figure 4 yes Figure 3 Enlarged view of point A in the middle.

[0023] Reference numerals:

[0024] 10. Battery cells;

[0025] 1. Shell; 11. Open mouth; 12. Bottom wall; 13. Protrusion; 14. Groove;

[0026] 2. Cover plate assembly;

[0027] 3. Pole group. DETAILED DESCRIPTION

[0028] 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 only used to explain the present invention, and cannot be understood as limiting the present invention.

[0029] In the description of the present utility model, it is necessary to understand 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 positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, features defined as "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, unless otherwise specified, "multiple" means two or more.

[0030] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" 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 or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] Please refer to the following Figure 1-4 A battery cell 10 according to an embodiment of the present invention is described.

[0032] like Figure 1-Figure 4As shown, the battery cell 10 according to the embodiment of the utility model includes: a shell 1, a cover plate assembly 2 and a pole group 3.

[0033] Specifically, refer to Figure 1-Figure 4 One side of the shell 1 is open to form an open opening 11, and the side of the shell 1 opposite to the open opening 11 is a bottom wall 12, and one or more spaced protrusions 13 are provided on the inner surface of the bottom wall 12; the cover plate assembly 2 is arranged at the open opening 11; the pole group 3 is arranged in the shell 1.

[0034] It should be noted that the protrusion 13 abuts against the pole group 3, and the protrusion 13 cooperates with the cover plate assembly 2, thereby limiting the movement of the pole group 3 in the arrangement direction of the cover plate assembly 2 and the protrusion 13, thereby improving the installation stability of the pole group 3. Figure 3 The example shown is used to describe the limiting effect of the protrusion 13 and the cover plate assembly 2 on the electrode group 3:

[0035] For example, Figure 3 and Figure 4 In the example shown, the pole group 3 is located below the protrusion 13 and the cover plate assembly 2 is located above the protrusion 13, so that the protrusion 13 can limit the upward movement of the pole group 3 and the cover plate assembly 2 can limit the downward movement of the pole group 3, thereby achieving a limiting effect.

[0036] It can be understood that the outer edge of the inner surface of the bottom wall 12 has a corner, and the outer edge of the pole group 3 on the side facing the protrusion 13 also has a corner. The setting of the protrusion 13 can separate the corner of the outer edge of the inner surface of the bottom wall 12 from the corner of the outer edge of the pole group 3 on the side facing the protrusion 13, thereby avoiding installation interference between the corner of the outer edge of the inner surface of the bottom wall 12 and the corner of the outer edge of the pole group 3 on the side facing the protrusion 13.

[0037] Furthermore, if Figure 3 and Figure 4 As shown, since one or more spaced protrusions 13 are provided on the inner surface of the bottom wall 12, an exhaust channel can be formed between adjacent protrusions 13, and an explosion-proof valve is provided on the cover plate assembly 2, which is connected to the exhaust channel. Therefore, when thermal runaway occurs in the electrode group 3, the side of the electrode group 3 facing the protrusion 13 can be discharged to the explosion-proof valve through the exhaust channel, so that the exhaust of the electrode group 3 is unobstructed, thereby improving the safety of the battery cell 10.

[0038] In addition, by providing one or more spaced protrusions 13 on the inner surface of the bottom wall 12, compared with providing a bottom support plate between the bottom wall and the pole group, the bottom support plate is reduced, thereby simplifying the structure, reducing the cost of the battery cell 10 and also reducing the weight of the battery cell 10.

[0039] According to the battery cell 10 of the embodiment of the utility model, one side of the housing 1 is opened to form an open opening 11, and the side of the housing 1 opposite to the open opening 11 is a bottom wall 12, and one or more spaced protrusions 13 are arranged on the inner surface of the bottom wall 12; the cover plate assembly 2 is arranged at the open opening 11; the electrode group 3 is arranged in the housing 1. Thus, the exhaust of the electrode group 3 is unobstructed, thereby improving the safety of the battery cell 10. In addition, the arrangement of the bottom support plate is reduced, thereby simplifying the structure, reducing the cost of the battery cell 10 and also reducing the weight of the battery cell 10.

[0040] In some embodiments of the present invention, Figure 1 , Figure 2 and Figure 4 As shown, there are a plurality of protrusions 13 spaced apart along the length direction of the bottom wall 12. Thus, the plurality of protrusions 13 spaced apart along the length direction of the bottom wall 12 limit the position of the pole group 3, thereby improving the installation stability of the pole group 3 in the length direction of the bottom wall 12. At the same time, it is also possible to further avoid installation interference between the corners formed by the inner surface of the bottom wall 12 and the two side walls oppositely arranged along the width direction of the bottom wall 12 and the corners of the pole group 3 facing the protrusions 13.

[0041] In some embodiments of the present invention, Figure 1 , Figure 2 and Figure 4 As shown, in the length direction of the bottom wall 12, the spacing between two adjacent protrusions 13 is e, the length of the pole group 3 is L, and it satisfies: L>e≥L / 4, and e can be L / 2, L / 3, 3L / 4 or 2L / 3, etc. Therefore, in the length direction of the bottom wall 12, the spacing between two adjacent protrusions 13 is reasonable, so that there is enough spacing between the two adjacent protrusions 13, thereby ensuring smooth exhaust. It also avoids the spacing between two adjacent protrusions 13 being too large, so that the number of protrusions 13 that can be arranged is too small, thereby ensuring the installation stability of the pole group 3.

[0042] In some embodiments of the present invention, Figure 1 , Figure 2 and Figure 4 As shown, the outer contour of the cross section of the protrusion 13 is circular, the spacing between the two inner walls of the housing 1 opposite to each other along the width direction of the bottom wall 12 is m, the diameter of the protrusion 13 is d, 5≤d≤m-5, d can be 5, 6, 7 or m-5, etc. Thus, the protrusion 13 has a suitable diameter, so that it can ensure that the protrusion 13 has sufficient strength, thereby ensuring reliable limiting of the electrode group 3 and ensuring the installation stability of the electrode group 3, and at the same time, it can also avoid the protrusion 13 having a too large diameter, which leads to too small a spacing between two adjacent protrusions 13, thereby ensuring smooth exhaust and ensuring the safety of the battery cell 10.

[0043] In some embodiments of the utility model, the outer contour of the cross section of the protrusion 13 is a polygon, the distance between the two inner walls of the shell 1 opposite to each other along the width direction of the bottom wall 12 is m, the diameter of the inscribed circle of the polygon is d, 5≤d≤m-5, d can be 5, 6, 7 or m-5, etc. Thus, the protrusion 13 has a suitable diameter, so as to ensure that the protrusion 13 has sufficient strength, thereby ensuring reliable positioning of the electrode group 3 and ensuring the installation stability of the electrode group 3, and at the same time, it can also avoid the protrusion 13 from being too large in diameter, which leads to too small a distance between two adjacent protrusions 13, thereby ensuring smooth exhaust and ensuring the safety of the battery cell 10.

[0044] In some embodiments of the present invention, Figure 3 and Figure 4 As shown, a groove 14 is provided on the outer surface of the bottom wall 12 at a position opposite to the protrusion 13. Thus, the protrusion 13 is conveniently formed by a stamping process, thereby facilitating the production of the battery cell 10 of the utility model and improving production efficiency.

[0045] In some embodiments of the present invention, the portion of the outer surface of the bottom wall 12 opposite to the protrusion 13 is flush with the rest of the portion. Thus, it is possible to ensure that the protrusion 13 of the bottom wall 12 has sufficient thickness, thereby improving the structural strength of the protrusion 13 of the bottom wall 12, ensuring the installation stability of the electrode group 3, and improving the durability of the battery cell 10.

[0046] In some embodiments of the present invention, Figure 3 and Figure 4 As shown, the wall thickness of the bottom wall 12 where the protrusion 13 is provided is a, and the minimum wall thickness of the two side walls of the shell 1 that are relatively arranged along the width direction of the bottom wall 12 is b, and a≥b. Therefore, it is further ensured that the protrusion 13 of the bottom wall 12 has sufficient thickness, thereby improving the structural strength of the protrusion 13 of the bottom wall 12, ensuring the installation stability of the electrode group 3, and improving the durability of the battery cell 10.

[0047] In some embodiments of the present invention, Figure 3 and Figure 4 As shown, the height of the protrusion 13 is h, h≥0.2mm, and h is 0.2mm, 0.3mm, 0.4mm or 0.5mm, etc. Therefore, the protrusion 13 has sufficient strength, thereby improving the limiting effect of the protrusion 13 on the electrode group 3, thereby further ensuring the installation stability of the electrode group 3, and also improving the strength of the protrusion 13 of the bottom wall 12, thereby improving the durability of the battery cell 10.

[0048] A battery pack according to an embodiment of the present invention is described below.

[0049] The battery pack according to the embodiment of the present invention includes the battery cell 10 described above.

[0050] According to the battery pack of the embodiment of the utility model, by setting the above-mentioned battery cell 10, one side of the shell 1 is opened to form an open opening 11, the side of the shell 1 opposite to the open opening 11 is a bottom wall 12, and one or more spaced protrusions 13 are arranged on the inner surface of the bottom wall 12; the cover plate assembly 2 is arranged at the open opening 11; the electrode group 3 is arranged in the shell 1. Thus, the exhaust of the electrode group 3 is unobstructed, thereby improving the safety of the battery cell 10. And the arrangement of the bottom support plate is reduced, thereby simplifying the structure, reducing the cost of the battery cell 10 and also reducing the weight of the battery cell 10.

[0051] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0052] 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. A battery cell, characterized in that: include: A shell, one side of which is open to form an open opening, a side of the shell opposite to the open opening being a bottom wall, and one or more spaced protrusions are provided on an inner surface of the bottom wall; A cover plate assembly, the cover plate assembly being arranged at the opening; A pole group is arranged in the shell.

2. The battery cell according to claim 1, characterized in that: The protrusions are multiple and spaced apart along the length direction of the bottom wall.

3. The battery cell according to claim 2, characterized in that: In the length direction of the bottom wall, the distance between two adjacent protrusions is e, the length of the pole group is L, and the following condition is satisfied: L>e≥L / 4.

4. The battery cell according to claim 1, characterized in that: The outer contour of the cross section of the protrusion is circular, the distance between the two inner walls of the shell that are opposite to each other along the width direction of the bottom wall is m, the diameter of the protrusion is d, and 5≤d≤m-5.

5. The battery cell according to claim 1, characterized in that: The outer contour of the cross section of the protrusion is a polygon, the distance between the two inner walls of the shell facing each other along the width direction of the bottom wall is m, the diameter of the inscribed circle of the outer contour of the cross section of the protrusion is d, 5≤d≤m-5.

6. The battery cell according to claim 1, characterized in that: A groove is provided on the outer surface of the bottom wall at a position opposite to the protrusion.

7. The battery cell according to claim 1, characterized in that: The portion of the outer surface of the bottom wall opposite to the protrusion is flush with the remaining portion.

8. The battery cell according to claim 1, characterized in that: The wall thickness of the bottom wall where the protrusion is provided is a, and the minimum wall thickness of the two side walls of the shell that are oppositely provided along the width direction of the bottom wall is b, and a≥b.

9. The battery cell according to claim 1, characterized in that: The height of the protrusion is h, and h≥0.2 mm.

10. A battery pack, characterized in that: Comprising a battery cell according to any one of claims 1 to 9.

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