Battery cell and battery pack with same

Abstract

The utility model discloses a single battery and a battery pack with the single battery, the single battery comprises a shell, a pole group and a plurality of side plates, the shell defines a mounting space, and the inner surface of the shell is provided with a welding seam; the pole group is arranged in the mounting space; and the plurality of side plates are arranged between the pole group and the shell, are sequentially arranged at intervals along the length direction of the battery monomers, and are arranged opposite to the weld joints. According to the battery monomer disclosed by the utility model, the plurality of side plates are arranged between the pole group and the shell, are sequentially arranged at intervals along the length direction of the battery monomer, and are arranged opposite to the weld joints on the inner surface of the shell, so that the pole group can be protected by the plurality of side plates, and short circuit caused by contact between the pole group and the shell at the weld joints is avoided; and the electric safety of the single battery is improved. And the length of the single side plate is relatively short, so that the straightness of the single side plate can be improved, the bending deformation of the side plate due to relatively long length is avoided as much as possible, and the assembly yield of the single battery is improved.

Description

Technical Field

[0001] The utility model mainly relates to the technical field of batteries, and particularly relates to a battery cell and a battery pack having the same. Background Art

[0002] In the prior art, since the weld seam on the inner side of the housing of the battery cell may protrude from the inner surface, it is easy to scratch the electrode assembly, causing safety risks. Placing a side plate between the electrode assembly and the housing can prevent the weld seam from scratching the electrode assembly. However, the length of the whole side plate is relatively long, and it is easy to bend and deform, resulting in poor straightness of the side plate and affecting the assembly of the battery cell. Summary of the Utility Model

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. For this purpose, the utility model provides a battery cell. The length of a single side plate of the battery cell is short, which can improve the straightness of the single side plate, avoid the bending deformation caused by the long length of the side plate as much as possible, and improve the assembly yield rate of the battery cell.

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

[0005] The battery cell according to an embodiment of the utility model includes a housing, an electrode assembly, and a plurality of side plates. The housing defines an installation space, and a weld seam is provided on the inner surface of the housing; the electrode assembly is arranged in the installation space; the plurality of side plates are arranged between the electrode assembly and the housing, and the plurality of side plates are sequentially arranged at intervals along the length direction of the battery cell, and the plurality of side plates are all arranged opposite to the weld seam.

[0006] The battery cell according to an embodiment of the utility model, by arranging a plurality of side plates between the electrode assembly and the housing, the plurality of side plates are sequentially arranged at intervals along the length direction of the battery cell, and the plurality of side plates are all arranged opposite to the weld seam on the inner surface of the housing. The plurality of side plates can protect the electrode assembly, avoid the electrode assembly from contacting the housing at the weld seam and causing a short circuit, and increase the electrical safety of the battery cell. And the length of a single side plate is short, which can improve the straightness of the single side plate, avoid the bending deformation caused by the long length of the side plate as much as possible, and improve the assembly yield rate of the battery cell.

[0007] In some embodiments of the utility model, a plurality of exhaust holes are provided on the side plate, and the exhaust holes penetrate through the side plate.

[0008] In some embodiments of the utility model, the exhaust holes are oval holes, circular holes or polygonal holes.

[0009] In some embodiments of the utility model, the dimension of the side plate in the thickness direction is H and satisfies: 0.3 mm ≤ H ≤ 1 mm.

[0010] In some embodiments of the present utility model, the dimension of the side plate in the length direction is L, and the dimension of the side plate in the width direction is B, and they satisfy: 10 ≤ L / B ≤ 15.

[0011] In some embodiments of the present utility model, an insulating film is coated on the outer side of the electrode group. The insulating film is arranged inside the housing. The insulating film includes a main body portion and a folding portion. The main body portion wraps the outer peripheral wall of the electrode group, and the folding portion wraps the side plate.

[0012] In some embodiments of the present utility model, a plurality of first positioning holes are provided on the folding portion, and a plurality of second positioning holes are provided on the portion of the main body portion far from the folding portion for laminating with the folding portion. The plurality of exhaust holes, the plurality of first positioning holes, and the plurality of second positioning holes are opposite and communicated.

[0013] In some embodiments of the present utility model, a plurality of protrusions are provided on one side of the side plate in the thickness direction facing the weld, and the protrusions cooperate with the inner surface of the housing where the weld is provided.

[0014] In some embodiments of the present utility model, the side plate is a PP part or a PPS part.

[0015] The battery pack according to the embodiment of the present utility model includes the above-mentioned battery cell.

[0016] In the battery pack according to the embodiment of the present utility model, by arranging a plurality of side plates between the electrode group and the housing, the plurality of side plates are sequentially arranged at intervals along the length direction of the battery cell, and the plurality of side plates are all arranged opposite to the weld on the inner surface of the housing. The plurality of side plates can protect the electrode group, avoid the electrode group contacting the housing at the weld to cause a short circuit, and increase the electrical safety of the battery cell. Moreover, the length of a single side plate is short, which can improve the straightness of a single side plate, and can avoid the bending deformation of the side plate due to its long length as much as possible, and improve the assembly yield rate of the battery cell.

[0017] The additional aspects and advantages of the present utility model will be partly given in the following description, partly will become obvious from the following description, or will be understood through the practice of the present utility model. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above and / or additional aspects and advantages of the present utility model will become obvious and easy to understand from the description of the embodiments in conjunction with the following drawings, wherein:

[0019] Figure 1 is a perspective view of the battery cell removing the housing according to the embodiment of the present utility model;

[0020] Figure 2 is a front view of the battery cell removing the housing according to the embodiment of the present utility model;

[0021] Figure 3 It is the front view of the side plate of the battery cell according to the embodiment of the present utility model.

[0022] Reference numerals:

[0023] 100, battery cell;

[0024] 1, side plate; 11, exhaust hole; 2, electrode group; 3, first top cover; 31, positive electrode post; 4, second top cover; 41, negative electrode post. Detailed implementation manners

[0025] The embodiments of the present utility model will be described in detail below. Examples of the embodiments are shown in the drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are only used to explain the present utility model and should not be construed as a limitation of the present utility model.

[0026] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the 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 thus should not be construed as a limitation of 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, the meaning of "a plurality" is two or more.

[0027] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "mounted", "connected" and "connected" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the internal communication of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0028] Next, refer to Figures 1-3 Describe the battery cell 100 according to the embodiment of the present utility model.

[0029] As Figure 1As shown, the battery cell 100 according to the embodiment of the present invention includes a housing, an electrode group 2 and a plurality of side plates 1 .

[0030] Specifically, the shell defines an installation space, and a weld is provided on the inner surface of the shell. The shell is formed by folding a whole metal plate. The shell needs to be connected by welding after folding. After the shell is welded, there is a weld inside the shell. After welding, the weld will be cleaned, but the weld will still have certain burrs after cleaning.

[0031] In the prior art, since the weld on the inner side of the battery cell shell protrudes from the inner surface, it is easy to scratch the electrode group, causing safety risks. Placing a side plate between the electrode group and the shell can prevent the weld from scratching the electrode group. However, the entire side plate is long and prone to bending and deformation, resulting in poor straightness of the side plate, affecting the assembly of the battery cell.

[0032] The electrode group 2 is arranged in the installation space, and a plurality of side plates 1 are arranged between the electrode group 2 and the housing. The plurality of side plates 1 are arranged along the length direction of the battery cell 100 (such as Figure 1 The plurality of side plates 1 are arranged in sequence in the first direction shown in the figure, and the plurality of side plates 1 are arranged opposite to the welding seam. The plurality of side plates 1 can protect the electrode group 2, avoid a short circuit caused by contact between the electrode group 2 and the shell at the welding seam, and increase the electrical safety of the battery cell 100.

[0033] Multiple side panels 1 are arranged in sequence and at intervals along the length direction of the battery cell 100 and are all arranged opposite to the weld. The length of a single side panel 1 is relatively short, which can improve the straightness of the single side panel 1 and avoid bending deformation of the side panel 1 due to its long length as much as possible, thereby improving the assembly yield of the battery cell 100.

[0034] According to the battery cell 100 of the embodiment of the utility model, by arranging multiple side plates 1 between the electrode group 2 and the shell, the multiple side plates 1 are sequentially arranged at intervals along the length direction of the battery cell 100, and the multiple side plates 1 are arranged opposite to the weld seam on the inner surface of the shell. The multiple side plates 1 can protect the electrode group 2, avoid the electrode group 2 and the shell at the weld to contact and cause a short circuit, and increase the electrical safety of the battery cell 100. In addition, the length of a single side plate 1 is relatively short, which can improve the straightness of the single side plate 1, and try to avoid the bending deformation of the side plate 1 due to its long length, thereby improving the assembly yield of the battery cell 100.

[0035] In some embodiments of the present invention, Figures 1-2 As shown, the side plate 1 is provided with a plurality of exhaust holes 11, which penetrate the side plate 1. A passage can be formed between the side plate 1 and the shell, which helps to discharge the hot gas of the battery cell 100 in time when the battery cell 100 has thermal runaway, thereby increasing the thermal safety of the battery cell 100.

[0036] Further, the exhaust hole 11 is an oval hole, a circular hole, or a polygonal hole. For example, the exhaust hole 11 can be an oval hole, a circle, a triangle, a square, a regular pentagon, a parallelogram, etc. The shape of the exhaust hole 11 can be selected according to the exhaust requirements, etc., to meet different requirements for the side plate 1.

[0037] In this embodiment, as Figure 2 and Figure 3 shown, the exhaust hole 11 is a circular hole.

[0038] In some embodiments of the present utility model, the dimension of the side plate 1 in the thickness direction is H and satisfies: 0.3 mm ≤ H ≤ 1 mm. It can be understood that the dimension H of the side plate 1 in the thickness direction can be 0.3 mm, 0.35 mm, 0.4 mm, 0.45 mm, 0.5 mm, 0.55 mm, 0.6 mm, 0.65 mm, 0.7 mm, 0.75 mm, 0.8 mm, 0.85 mm, 0.9 mm, 0.95 mm, or 1 mm. The dimension H of the side plate 1 in the thickness direction is not less than 0.3 mm, which can ensure the strength of the side plate 1 and avoid the side plate 1 from breaking; the dimension H of the side plate 1 in the thickness direction is not greater than 1 mm, which can avoid the relatively high material cost of the side plate 1, and can avoid the side plate 1 occupying the internal space of the battery cell 100, and can avoid reducing the energy density of the battery cell 100.

[0039] In some embodiments of the present utility model, as Figure 3 shown, the dimension of the side plate 1 in the length direction (such as the left - right direction shown in Figure 3 ) is L, and the dimension of the side plate 1 in the width direction (such as the up - down direction shown in Figure 3 ) is B and satisfies: 10 ≤ L / B ≤ 15. It can be understood that the value of the dimension L of the side plate 1 in the length direction divided by the dimension B of the side plate 1 in the width direction can be 10, 10.5, 11, 11.5, 12, 12.5, 13, 13.5, 14, 14.5, or 15. The value of the dimension L of the side plate 1 in the length direction divided by the dimension B of the side plate 1 in the width direction is not less than 10, which can avoid the length of the side plate 1 being too short, and can avoid the relatively large number of side plates 1 required for assembly, and avoid affecting the assembly speed of the battery cell 100; the value of the dimension L of the side plate 1 in the length direction divided by the dimension B of the side plate 1 in the width direction is not greater than 15, which can avoid the length of the side plate 1 being too long, and can avoid the side plate 1 being prone to bending deformation, and avoid the poor straightness of the side plate 1, and avoid affecting the assembly of the battery cell 100.

[0040] In some embodiments of the present utility model, the outer side of the electrode group 2 is coated with an insulating film. The insulating film is arranged inside the housing. The insulating film includes a main body portion and a folding portion. The main body portion wraps the outer peripheral wall of the electrode group 2, and the folding portion wraps the side plate 1. The insulating film can protect the electrode group 2, enabling the electrode group 2 to have a good insulation effect, and the assembly of the electrode group 2 and the side plate 1 is relatively convenient.

[0041] Further, a plurality of first positioning holes are provided on the folding portion, and a plurality of second positioning holes are provided on the portion of the main body portion away from the folding portion for laminating with the folding portion. A plurality of exhaust holes 11, a plurality of first positioning holes, and a plurality of second positioning holes are opposite and communicate with each other. After the assembly of the electrode group 2 and the side plate 1 with the insulating film is completed, the detection rod can be inserted into the first positioning hole, the second positioning hole, and the exhaust hole 11 to detect whether the detection rod can contact the electrode group 2. When the detection rod can contact the electrode group 2, the folding of the insulating film is successful; when the detection rod cannot contact the electrode group 2, the folding of the insulating film fails. The folding effect of the insulating film can be detected relatively conveniently, and the assembly efficiency of the electrode group 2 and the side plate 1 with the insulating film is relatively high.

[0042] In some embodiments of the present utility model, the insulating film is a Mylar film. The Mylar film has excellent insulating properties, which can prevent the electrode group 2 from short-circuiting and can increase the reliability of the battery cell 100.

[0043] In some embodiments of the present utility model, a plurality of protrusions are provided on one side of the side plate 1 in the thickness direction facing the weld. The protrusions cooperate with the inner surface of the housing where the weld is provided. When the battery cell 100 is impacted, the protrusions are closely attached to the weld of the housing. The protrusions can disperse the external impact force, preventing the impact suffered by the inside of the housing of the battery cell 100 from concentrating at the same place, which helps with buffering and shock absorption and increases the reliability of the battery cell 100.

[0044] In some embodiments of the present utility model, the protrusions extend along the width direction of the plate body. The structure of the protrusions on the plate body is relatively simple, and a plurality of protrusions are arranged at intervals along the length direction of the plate body, which can make the structure of the protrusions relatively regular and the surface of the plate body provided with the protrusions more beautiful.

[0045] Further, in the cross-section of the plate body perpendicular to the width direction of the plate body, the contour line on the side of the plate body in the thickness direction close to the weld forms a wavy shape. It can be understood that the surface of the plate body provided with the protrusions includes a plurality of convex arc surfaces and a plurality of concave arc surfaces, which are arranged at intervals. This can make the connection of the surface of the plate body provided with the protrusions smoother, and when the battery cell 100 is impacted, the impact force can be dispersed in multiple directions, increasing the buffering and shock absorption effect of the side plate 1 and making the battery cell 100 more reliable.

[0046] The shape of the wavy surface is not unique, and the arc length and curvature are not unique. The arc length and curvature of the protrusion can be selected according to needs to meet different needs for the side plate 1.

[0047] In some embodiments of the present invention, the side panel 1 is a PP (Polypropylene) part or a PPS (Polyphenylene sulfide) part. The side panel 1 is made of plastic material. The side panel 1 can be manufactured by injection molding or die cutting, which can make the manufacturing method of the side panel 1 simpler.

[0048] In some embodiments of the present invention, Figure 1 As shown, the housing includes a first top cover 3 and a second top cover 4, and the battery cell 100 also includes a positive electrode column 31 and a negative electrode column 41, one of the positive electrode column 31 and the negative electrode column 41 is arranged on the first top cover 3, and the other of the positive electrode column 31 and the negative electrode column 41 is arranged on the second top cover 4; or, the positive electrode column 31 and the negative electrode column 41 are arranged on the first top cover 3; or, the positive electrode column 31 and the negative electrode column 41 are arranged on the second top cover 4. In this embodiment, one of the positive electrode column 31 and the negative electrode column 41 is arranged on the first top cover 3, and the other of the positive electrode column 31 and the negative electrode column 41 is arranged on the second top cover 4, so that the electrical connection of the positive and negative electrode columns 41 of the battery cell 100 is separated, which can increase the electrical safety of the battery cell 100.

[0049] The battery pack according to the embodiment of the present invention includes the above-mentioned battery cell 100 .

[0050] According to the battery pack of the embodiment of the utility model, by arranging multiple side panels 1 between the electrode group 2 and the shell, the multiple side panels 1 are sequentially arranged at intervals along the length direction of the battery cell 100, and the multiple side panels 1 are arranged opposite to the weld seam on the inner surface of the shell. The multiple side panels 1 can protect the electrode group 2, avoid the electrode group 2 and the shell at the weld to contact and cause a short circuit, and increase the electrical safety of the battery cell 100. In addition, the length of a single side panel 1 is relatively short, which can improve the straightness of the single side panel 1, and try to avoid the bending deformation of the side panel 1 due to its long length, thereby improving the assembly yield of the battery cell 100.

[0051] Other structures and operations of the battery cell 100 and the battery pack having the same according to the embodiment of the present invention are well known to those skilled in the art and will not be described in detail here.

[0052] In the description of this specification, the descriptions referring to terms such as "one embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0053] Although the embodiments of the present utility model have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present utility model, and the scope of the present utility model is defined by the claims and their equivalents.

Claims

1. A battery cell, characterized in that: include: A shell body, wherein the shell body defines an installation space, and an inner surface of the shell body is provided with a weld; A pole group, the pole group is arranged in the installation space; A plurality of side plates are provided between the electrode group and the shell, the plurality of side plates are arranged in sequence and spaced apart along the length direction of the battery cell, and the plurality of side plates are all arranged opposite to the welding seam.

2. The battery cell according to claim 1, characterized in that: The side plate is provided with a plurality of exhaust holes, and the exhaust holes penetrate through the side plate.

3. The battery cell according to claim 2, characterized in that: The exhaust hole is an elliptical hole, a circular hole or a polygonal hole.

4. The battery cell according to claim 1, characterized in that: The dimension of the side plate in the thickness direction is H and satisfies: 0.3mm≤H≤1mm.

5. The battery cell according to claim 1, characterized in that: The dimension of the side plate in the length direction is L, the dimension of the side plate in the width direction is B and they satisfy: 10≤L / B≤15.

6. The battery cell according to claim 2, characterized in that: The outer side of the pole group is covered with an insulating film, the insulating film is arranged in the shell, and the insulating film includes a main body and a folded part, the main body wraps the outer peripheral wall of the pole group, and the folded part wraps the side plate.

7. The battery cell according to claim 6, characterized in that: The folding portion is provided with a plurality of first positioning holes, a portion of the main body portion which is away from one end of the folding portion and is used to be stacked with the folding portion is provided with a plurality of second positioning holes, and the plurality of exhaust holes, the plurality of the first positioning holes and the plurality of the second positioning holes are opposite and connected.

8. The battery cell according to claim 1, characterized in that: A plurality of protrusions are provided on one side of the side plate in the thickness direction facing the weld, and the protrusions are matched with the inner surface of the shell on which the weld is provided.

9. The battery cell according to claim 1, characterized in that: The side panels are PP parts or PPS parts.

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

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