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 in the width direction is provided with a welding seam, and the welding seam extends along the length direction of the shell; the pole group is positioned in the shell; and the side plate extends along the length direction of the shell, and along the width direction of the shell, the side plate is positioned between one side, facing the welding seam, of the pole group and one side, provided with the welding seam, of the shell. According to the battery cell disclosed by the utility model, the pole group can be prevented from being in direct contact with the welding seam, so that the condition that the pole group is damaged is reduced, the service life of the pole group is prolonged, and the durability of the battery cell is improved.

Description

Technical Field

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

[0002] At present, the battery cell shell is obtained by bending a plate and welding its ends. As a result, there will be welds on the welding surface of the battery cell shell. Due to welding process problems, the welds are often uneven. When the electrode group contacts the weld in the shell, it is easy to cause damage to the electrode group, thereby reducing the life 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 can avoid direct contact between the electrode group and the weld, thereby reducing the damage to the electrode group, thereby increasing the service life of the electrode group and improving the durability 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 in the width direction has a weld, and the weld extends along the length direction of the shell; a pole group, the pole group is located inside the shell; and a side plate, the side plate extends along the length direction of the shell, and along the width direction of the shell, the side plate is located between the side of the pole group facing the weld and the side of the shell having the weld.

[0006] According to the battery cell of the embodiment of the utility model, the electrode group is located in the shell by having a weld on one side in the width direction of the shell, and the weld extends along the length direction of the shell; the side plate extends along the length direction of the shell, and along the width direction of the shell, the side plate is located between the side of the electrode group facing the weld and the side of the shell having the weld. Thus, direct contact between the electrode group and the weld can be avoided, thereby reducing the situation where the electrode group is damaged, thereby increasing the service life of the electrode group and improving the durability of the battery cell.

[0007] In some embodiments of the present invention, the side panel includes a side panel body, and the side panel body has a first opening and a second opening on both sides along the thickness direction of the shell, respectively, and the first opening and the second opening are multiple and spaced apart along the length direction of the shell.

[0008] In some embodiments of the present invention, the first opening and the second opening are symmetrically arranged along a symmetry axis extending in the length direction of the shell; or, the first opening and the second opening are staggered in the length direction of the shell.

[0009] In some embodiments of the utility model, along the length direction of the shell, the length of the side panel body is P, the length of the first opening and the second opening is N, (0.5P) mm ≥ N ≥ 5 mm; and / or, the edges of the first opening and the second opening on opposite sides along the length direction of the shell form an angle α with the length direction of the shell, 160° ≥ α ≥ 30°.

[0010] In some embodiments of the utility model, the side plate body has a positioning hole, the pole group has a limiting hole, and fasteners are passed through the positioning hole and the limiting hole to connect the side plate body with the pole group.

[0011] In some embodiments of the present invention, in the length direction of the shell, the positioning hole is staggered from the first opening and the second opening.

[0012] In some embodiments of the utility model, along the thickness direction of the shell, the width of the side panel body at the first opening and / or the second opening is B, the width at other positions of the side panel body is D, the thickness of the shell is S, the diameter of the positioning hole is C, 0.95D≥B≥0.4D, 0.95S≥D≥0.4S, 0.7D≥C≥0.15D.

[0013] In some embodiments of the present invention, the length of the shell is J, the length of the side panel is L, 0.99J≥L≥0.7J; and / or, along the width direction of the shell, the thickness of the side panel is T, 3mm≥T≥0.2mm.

[0014] In some embodiments of the present invention, the side plate is made of pp material; and / or, at a DC voltage of 500V, the resistance of the side plate is greater than or equal to 500MΩ.

[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 in the width direction has a weld, and the weld extends along the length direction of the shell; the electrode group is located in the shell; the side plate extends along the length direction of the shell, and along the width direction of the shell, the side plate is located between the side of the electrode group facing the weld and the side of the shell with the weld. In this way, direct contact between the electrode group and the weld can be avoided, thereby reducing the situation where the electrode group is damaged, thereby increasing the service life of the electrode group and improving the durability 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 a three-dimensional diagram of a shell of a battery cell according to an embodiment of the utility model;

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

[0021] Figure 3 yes Figure 2 Enlarged view of point A in the middle.

[0022] Reference numerals:

[0023] 1. Shell; 11. Welding seam;

[0024] 2. Side panel; 21. Side panel body; 22. First opening; 23. Second opening; 24. Positioning hole. DETAILED DESCRIPTION

[0025] 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.

[0026] 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.

[0027] 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.

[0028] like Figure 1-Figure 3 As shown, the battery cell according to the embodiment of the utility model includes: a shell 1, a side plate 2 and a pole group (the pole group is not shown).

[0029] Specifically, Figure 1 and Figure 2 As shown, one side of the shell 1 in the width direction has a weld 11, and the weld 11 extends along the length direction of the shell 1; the pole group is located inside the shell 1; the side plate 2 extends along the length direction of the shell 1, and along the width direction of the shell 1, the side plate 2 is located between the side of the pole group facing the weld 11 and the side of the shell 1 having the weld 11.

[0030] It can be understood that the side plate 2 is located between the side of the pole group facing the weld 11 and the side of the shell 1 having the weld 11, so that the weld 11 is separated from the pole group, so that when the pole group is in the shell 1, direct contact between the pole group and the weld 11 can be avoided, thereby reducing damage to the pole group, thereby increasing the service life of the pole group and the durability of the battery cell.

[0031] According to the battery cell of the embodiment of the utility model, the electrode group is located in the housing 1 by having a weld 11 on one side in the width direction of the housing 1, and the weld 11 extends along the length direction of the housing 1; the side plate 2 extends along the length direction of the housing 1, and along the width direction of the housing 1, the side plate 2 is located between the side of the electrode group facing the weld 11 and the side of the housing 1 having the weld 11. Thus, the electrode group can be prevented from directly contacting the weld 11, thereby reducing the situation where the electrode group is damaged, thereby increasing the service life of the electrode group and improving the durability of the battery cell.

[0032] In some embodiments of the present invention, Figure 1-Figure 3 As shown, the side plate 2 includes a side plate body 21, and the side plate body 21 has a first opening 22 and a second opening 23 on both sides along the thickness direction of the shell 1, and the first opening 22 and the second opening 23 are both multiple and spaced apart along the length direction of the shell 1. It should be noted that the thickness direction of the shell 1, the length direction of the shell 1, and the width direction of the shell 1 are perpendicular to each other.

[0033] It can be understood that by providing the first opening 22 and the second opening 23 on both sides of the side panel body 21 along the thickness direction of the shell 1, the volume of the side panel body 21 can be reduced, thereby reducing the weight of the side panel 2, which is beneficial to the lightweight of the battery cell and also reduces the manufacturing cost.

[0034] In some embodiments of the present invention, Figure 1-Figure 3 As shown, the first opening 22 and the second opening 23 are symmetrically arranged along the symmetry axis extending in the length direction of the housing 1, thereby facilitating the arrangement of the first opening 22 and the second opening 23, thereby simplifying the production process and improving production efficiency.

[0035] In some embodiments of the utility model, the first opening 22 and the second opening 23 are staggered in the length direction of the shell 1, thereby making the width of the first opening 22 and the second opening 23 along the thickness direction of the shell 1 larger, thereby further reducing the volume of the side panel body 21, thereby reducing the weight of the side panel 2, which is beneficial to the lightweight of the battery cell and also reduces the manufacturing cost.

[0036] In some embodiments of the present invention, Figure 1-Figure 3 As shown, along the length direction of the shell 1, the length of the side plate body 21 is P, the length of the first opening 22 and the second opening 23 is N, (0.5P)mm≥N≥5mm, N can be 5mm, 6mm, 7mm or (0.5P)mm, etc., where P is greater than 10.

[0037] It can be understood that (0.5P)mm≥N≥5mm, so that the lengths of the first opening 22 and the second opening 23 are appropriate along the length direction of the shell 1, which can not only increase the volume of the side panel body 21, thereby reducing the weight of the side panel 2, which is beneficial to the lightweight of the battery cell, but also reduce the manufacturing cost, and ensure the structural strength of the side panel body 21 and the durability of the side panel body 21.

[0038] In some embodiments of the present invention, Figure 1-Figure 3 As shown, the edges of the first opening 22 and the second opening 23 on opposite sides along the length direction of the shell 1 form an angle α with the length direction of the shell 1, 160°≥α≥30°, and α can be 30°, 50°, 80° or 160°, etc.

[0039] It is understandable that α that is too small or too large is not conducive to processing and forming the first opening 22 and the second opening 23 on the side panel body 21. Therefore, 160°≥α≥30° makes it possible for the edges of the first opening 22 and the second opening 23 on the opposite sides along the length direction of the shell 1 to form an appropriate angle with the length direction of the shell 1, thereby facilitating the production of the battery cell of the utility model and improving production efficiency.

[0040] In some embodiments of the present invention, Figure 2 and Figure 3 As shown, the side plate body 21 has a positioning hole 24, the pole group has a limiting hole (not shown), and fasteners such as a latch are inserted into the positioning hole 24 and the limiting hole to connect the side plate body 21 to the pole group. As a result, the connection reliability between the side plate body 21 and the pole group is improved, thereby avoiding displacement between the side plate body 21 and the pole group to reduce the protective effect of the side plate body 21 on the pole group, thereby improving the protective effect of the side plate body 21 on the pole group.

[0041] Furthermore, the side plate body 21 is welded to the pole group, and preliminary positioning can be performed by fasteners passing through the positioning holes 24 and the limiting holes, thereby facilitating the welding of the side plate body 21 and the pole group and improving production and installation efficiency.

[0042] In addition, if Figure 2 and Figure 3 As shown, the positioning holes 24 are multiple and spaced apart along the length direction of the side plate body 21, thereby further improving the connection reliability between the side plate body 21 and the pole group. Figure 2 and Figure 3 In the example shown, there are two positioning holes 24 spaced apart along the length direction of the side plate body 21 , but the present invention is not limited thereto, and there may be more positioning holes 24 , such as 3, 4, 5 or 6.

[0043] In some embodiments of the present invention, Figure 1-Figure 3 As shown, in the length direction of the housing 1, the positioning hole 24 is staggered with the first opening 22 and the second opening 23. It is understandable that if the positioning hole 24 is arranged opposite to one or both of the first opening 22 or the second opening 23 in the thickness direction of the housing 1, the structure of the side plate body 21 here will be reduced. At the same time, there will be arrangement interference between the positioning hole 24 and one or both of the first opening 22 or the second opening 23, which is not conducive to the arrangement layout between the positioning hole 24, the first opening 22 and the second opening 23.

[0044] Therefore, in the length direction of the shell 1, the positioning hole 24 is staggered with the first opening 22 and the second opening 23, ensuring the structural strength of the side plate body 21 at all locations, while facilitating the arrangement layout of the positioning hole 24, the first opening 22 and the second opening 23.

[0045] In some embodiments of the present invention, Figure 1-Figure 3As shown, along the thickness direction of the shell 1, the width of the side plate body 21 at the first opening 22 and / or the second opening 23 is B, the width at other positions of the side plate body 21 is D, the thickness of the shell 1 is S, the diameter of the positioning hole 24 is C, 0.95D≥B≥0.4D, 0.95S≥D≥0.4S, 0.7D≥C≥0.15D.

[0046] It can be understood that 0.95D≥B≥0.4D, B can be 0.4D, 0.6D, 0.7D or 0.95D, etc., so that along the thickness direction of the shell 1, the side plate body 21 has a suitable width at the first opening 22 and / or the second opening 23, thereby satisfying the structural strength of the side plate body 21 and ensuring the durability of the side plate body 21. It can also be ensured that along the thickness direction of the shell 1, the width of the side plate body 21 can cover the width of the weld 11, so that the electrode group can be completely separated from the weld 11, thereby ensuring the protection effect of the electrode group. At the same time, it is also conducive to the lightweight of the side plate 2, thereby facilitating the lightweight of the battery cell.

[0047] Furthermore, 0.95S≥D≥0.4S, so that other positions of the side panel body 21 have a suitable width, which can avoid installation interference between the side panel body 21 and the shell 1, and at the same time, is also conducive to lightweighting of the side panel 2, thereby facilitating lightweighting of the battery cell.

[0048] Furthermore, 0.7D≥C≥0.15D, so that the diameter of the positioning hole 24 is appropriate, which is convenient for fasteners to pass through, thereby facilitating production and installation, while also ensuring the structural strength of the side panel body 21 here, avoiding the side panel body 21 from breaking due to the positioning hole 24 being too large, thereby improving the durability of the side panel body 21.

[0049] In some embodiments of the present invention, Figure 1 and Figure 2 As shown, the length of the shell 1 is J, the length of the side panel 2 is L, 0.99J≥L≥0.7J, L can be 0.7J, 0.75J, 0.8J or 0.99J, etc., thereby making the side panel 2 have a suitable length, which is beneficial to the lightweight of the side panel 2, thereby facilitating the lightweight of the battery cell, and at the same time, it can also ensure that the length of the side panel 2 can cover the length of the weld 11, so that the electrode group can be completely separated from the weld 11, thereby ensuring the protection effect of the electrode group.

[0050] In some embodiments of the present invention, along the width direction of the housing 1, the thickness of the side panel 2 is T, 3mm≥T≥0.2mm, and T can be 0.2mm, 1mm, 2mm, 2.5mm or 3mm, etc. Thus, the side panel 2 has a suitable thickness, which not only satisfies the structural strength of the side panel 2 and ensures the durability of the side panel 2, but also facilitates the lightweighting of the side panel 2, thereby facilitating the lightweighting of the battery cell.

[0051] In some embodiments of the utility model, the side panel 2 is made of pp (Polypropylene) material. It can be understood that the side panel 2 is located in the shell 1, and the shell 1 has an electrolyte. The side panel 2 is made of pp material, so that the side panel 2 has good insulation and corrosion resistance, thereby avoiding leakage of the battery cell, improving the safety of the battery cell, and also improving the durability of the side panel 2, thereby improving the durability of the battery cell.

[0052] In some embodiments of the utility model, under a DC voltage of 500V, the resistance of the side plate 2 is greater than or equal to 500MΩ, such as 600MΩ, 700MΩ, 800MΩ or 900MΩ, etc. Thus, the side plate 2 has good insulation, thereby further avoiding leakage of the battery cell, thereby further improving the safety of the battery cell.

[0053] A battery pack according to an embodiment of the present invention includes the above-mentioned battery cell.

[0054] According to the battery pack of the embodiment of the utility model, by providing the above-mentioned battery cell, one side of the shell 1 in the width direction has a weld 11, and the weld 11 extends along the length direction of the shell 1; the electrode group is located in the shell 1; the side plate 2 extends along the length direction of the shell 1, and along the width direction of the shell 1, the side plate 2 is located between the side of the electrode group facing the weld 11 and the side of the shell 1 having the weld 11. Thus, the electrode group can be prevented from directly contacting the weld 11, thereby reducing the situation where the electrode group is damaged, thereby increasing the service life of the electrode group and the durability of the battery cell.

[0055] 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.

[0056] 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, wherein one side of the shell in the width direction has a weld, and the weld extends along the length direction of the shell; A pole group, the pole group is located in the shell; A side plate, which extends along the length direction of the shell. Along the width direction of the shell, the side plate is located between the side of the pole group facing the weld and the side of the shell having the weld. The side plate includes a side plate body, and the side sides of the side plate body along the thickness direction of the shell respectively have a first opening and a second opening, and the first opening and the second opening are both multiple and spaced apart along the length direction of the shell.

2. The battery cell according to claim 1, characterized in that: The first opening and the second opening are symmetrically arranged along a symmetry axis extending in the length direction of the shell; Alternatively, the first opening and the second opening are staggered in the length direction of the shell.

3. The battery cell according to claim 1, characterized in that: Along the length direction of the shell, the length of the side plate body is P, the length of the first opening and the second opening is N, (0.5P) mm ≥ N ≥ 5 mm; And / or, the angles formed by the edges of the first opening and the second opening on two opposite sides along the length direction of the shell and the length direction of the shell are both α, and 160°≥α≥30°.

4. The battery cell according to claim 1, characterized in that: The side plate body is provided with a positioning hole, the pole group is provided with a limiting hole, and fasteners are passed through the positioning hole and the limiting hole to connect the side plate body with the pole group.

5. The battery cell according to claim 4, characterized in that: In the length direction of the shell, the positioning hole is staggered with the first opening and the second opening.

6. The battery cell according to claim 4, characterized in that: Along the thickness direction of the shell, the width of the side panel body at the first opening and / or the second opening is B, the width at other positions of the side panel body is D, the thickness of the shell is S, the diameter of the positioning hole is C, 0.95D≥B≥0.4D, 0.95S≥D≥0.4S, 0.7D≥C≥0.15D.

7. The battery cell according to claim 1, characterized in that: The length of the shell is J, the length of the side plate is L, 0.99J≥L≥0.7J; And / or, along the width direction of the shell, the thickness of the side plate is T, 3mm≥T≥0.2mm.

8. The battery cell according to claim 1, characterized in that: The side panels are made of PP material; And / or, under a DC voltage of 500 V, the resistance of the side plate is greater than or equal to 500 MΩ.

9. A battery pack, characterized in that: Comprising a battery cell according to any one of claims 1 to 8.

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