Single battery and battery pack

Abstract

The utility model discloses a single battery and a battery pack. The single battery comprises a shell and an insulating film, the shell comprises a side face and a bottom face, and the side face is annularly arranged on the edge of the bottom face. The insulating film wraps the side surfaces, and the bottom surface is used for being in direct contact with glue. The bottom surface of the shell is in an exposed state, the bottom surface of the shell is not coated with an insulating film, glue is filled in the box body in the assembling process of the single battery and the box body, the glue is arranged between the bottom surface of the shell and the box body, and after the glue is solidified, the bottom surface of the shell and the box body are directly bonded together; compared with the mode that the bottom surface of the shell is coated with the insulating film, no medium constraint exists between the insulating film and the bottom surface of the shell, so that no direct constraint relation exists between the shell and the box body, the bottom surface of the shell and the box body are directly bonded together by adding medium constraint, and the bonding strength between the single battery and the box body is improved. In addition, compared with the scheme that the insulating film is opened or not opened, the film coating cost of the single battery is also reduced.

Description

Technical Field

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

[0002] As a clean energy source, new energy is accepted by more and more people and widely popularized in all walks of life. Lithium batteries are widely used in new energy. Lithium batteries are applied to various electrical products. During use, lithium batteries move with the electrical products. Therefore, if they are not firmly fixed, they are prone to dislocation, resulting in a decrease in electrical conductivity. Summary of the Utility Model

[0003] An object of the utility model is to provide a single battery and a battery pack, aiming to solve the technical problem of the stability of the single battery.

[0004] To achieve the above object, a solution provided by the utility model is: a single battery, which includes a housing and an insulating film; the housing includes a side surface and a bottom surface. The side surface surrounds the edge of the bottom surface to jointly form a receiving cavity. The side surface is surrounded to form an opening communicating with the receiving cavity. The receiving cavity is used to accommodate the battery cell assembly; the insulating film is coated on the side surface, and no insulating film is provided on the bottom surface. The bottom surface is used for coating and directly contacting with glue.

[0005] Optionally, part of the side surface is coated with an insulating film. The insulating film and the bottom surface are arranged at intervals. The position on the side surface where no insulating film is provided is used for coating glue. The insulating film is provided with an XX avoidance hole, and the position on the side surface corresponding to the avoidance XX hole is used for contacting with glue.

[0006] Optionally, the avoidance hole is located at the connection between the side surface and the bottom surface. The distance between the insulating film and the bottom surface is L1, and the height of the side surface is H1.

[0007] Optionally, a matte structure is provided on the surface of the bottom surface facing away from the receiving cavity for contacting with glue.

[0008] Optionally, the included angle between the side surface and the bottom surface is an obtuse angle.

[0009] Optionally, a matte structure is provided at the position on the side surface corresponding to the avoidance hole where no insulating film is provided.

[0010] To achieve the above object, a solution provided by the utility model is: a battery pack, which includes: a box body, glue, and a plurality of single batteries as described in any one of the above. The plurality of single batteries are placed in the box body, and a glue layer is formed between the box body and the bottom surface through curing with glue.

[0011] Optionally, the plurality of single batteries are arranged at intervals. The insulating film and the bottom surface are arranged at intervals. The glue is filled between the side surfaces of adjacent single batteries.

[0012] Optionally, the distance between the bottom surface and the box body is L2, where 1 mm ≤ L2 ≤ 3 mm.

[0013] Optionally, the depth of the box body is H2, and the thickness displacement of the glue is D.

[0014] The beneficial effects of the present utility model are as follows:

[0015] The single cell of the present utility model includes a housing and an insulating film; the housing includes a side surface and a bottom surface, and the side surface is disposed around the edge of the bottom surface; the insulating film is coated on the side surface, and the bottom surface is used for direct contact with the glue. The bottom surface of the housing of the present utility model is in an exposed state, and the bottom surface of the housing is not coated with an insulating film. During the assembly process of the single cell and the box body, the box body is filled with glue, and the glue is located between the bottom surface of the housing and the box body. After the glue solidifies, the bottom surface of the housing and the box body are directly bonded together; compared with the case where the bottom surface of the housing is coated with an insulating film, there is no medium constraint between the insulating film and the bottom surface of the housing, so there is no direct constraint relationship between the housing and the box body. In the present application, the bottom surface of the housing and the box body are directly bonded together by increasing the medium constraint, thereby improving the bonding strength between the single cell and the box body. In addition, compared with the schemes of opening and not opening the insulating film, the present utility model also reduces the film coating cost of the single cell. Description of the Drawings

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0017] Figure 1 It is a schematic structural diagram of a battery pack provided by an embodiment of the present utility model;

[0018] Figure 2 It is a schematic cross-sectional structural diagram of a battery pack provided by an embodiment of the present utility model;

[0019] Figure 3 It is provided by an embodiment of the present utility model Figure 2 A partial enlarged schematic diagram of area A in

[0020] Figure 4 It is a schematic structural diagram of a single cell provided by an embodiment of the present utility model.

[0021] Explanation of the reference numerals in the drawings:

[0022] Box body 20, Glue 30, Single cell 10, Housing 12

[0023] Side 121, bottom surface 122, opening 123, insulating film 14, avoidance hole 142. Detailed implementation manners

[0024] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all embodiments. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0025] Please refer to Figures 1 to 4 as shown in Figure 1 which is a schematic structural diagram of a battery pack provided by an embodiment of the present utility model, Figure 2 which is a schematic cross-sectional structural diagram of a battery pack provided by an embodiment of the present utility model, Figure 3 which is provided by an embodiment of the present utility model Figure 2 a partial enlarged schematic diagram of area A in Figure 4 which is a schematic structural diagram of a single battery 10 provided by an embodiment of the present utility model.

[0026] An embodiment of the present utility model provides a battery pack, which includes a box body 20, glue 30 and a plurality of single batteries 10. The plurality of single batteries 10 are placed in the box body 20, and the glue 30 is connected to the box body 20 and the plurality of single batteries 10 respectively. The glue 30 has adhesiveness and can bond the plurality of single batteries 10 in the box body 20.

[0027] Specifically, the single battery 10 includes a housing 12 and an insulating film 14. The insulating film 14 covers the outer surface of the housing 12. The material of the housing 12 can be steel or aluminum. The housing 12 includes a side surface 121 and a bottom surface 122. The side surface 121 surrounds the edge of the bottom surface 122 to jointly form a receiving cavity. The receiving cavity can be square, circular or the like. The side surface 121 encloses an opening 123 communicating with the receiving cavity. The opening 123 can be square, circular or the like. The opening 123 and the bottom surface 122 are opposite to each other. The receiving cavity is used to receive the battery cell assembly, and the receiving cavity is also filled with electrolyte. The insulating film 14 is covered on the side surface 121, and the insulating film 14 is located on the outer surface of the side surface 121. The insulating film 14 is not provided on the bottom surface 122, and the bottom surface 122 is in a bare state. The glue 30 is applied to the bottom surface 122, and the glue 30 directly bonds the bottom surface 122 and the box body 20 together.

[0028] In this embodiment, the bottom surface 122 of the housing 12 is in an exposed state, the bottom surface 122 of the housing 12 is not coated with an insulating film 14, and the bottom surface 122 of the housing 12 is in direct contact with the glue. During the assembly process of the single cell 10 and the box body 20, the box body 20 is filled with glue, and the glue is between the bottom surface 122 of the housing 12 and the box body 20. After the glue solidifies, the bottom surface 122 of the housing 12 and the box body 20 are directly bonded together with high bonding strength. Compared with the bottom surface 122 of the housing 12 being coated with an insulating film 14, there is no medium constraint between the insulating film 14 and the bottom surface 122 of the housing 12. Therefore, there is no direct constraint relationship between the housing 12 and the box body 20. In this application, the bottom surface 122 of the housing 12 and the box body 20 are directly bonded together by increasing the medium constraint, which improves the bonding strength between the single cell 10 and the box body 20. In addition, compared with the schemes of the insulating film 14 with and without openings, the present utility model also reduces the film coating cost of the single cell 10.

[0029] In one embodiment, the insulating film 14 is provided with a relief hole 142, and the position of the side surface 121 corresponding to the relief hole 142 is used to contact the glue. The relief hole 142 allows a part of the side surface 121 to be coated with the insulating film 14. The relief hole 142 can be circular, or can be other shapes such as square. The number of the relief holes 142 can be one, or can be multiple and spaced apart from each other. By providing the relief holes 142 on the insulating film 14, the exposed area of the side surface 121 is increased to ensure that the glue and the side surface 121 are directly bonded together, thereby further improving the stability of the single cell 10. In this embodiment, glue 30 is also coated on the side surface 121, so as to increase the lateral constraint of the single cell 10, and together with the glue 30 with vertical constraint on the bottom surface 122, the fixing of the single cell 10 is completed, and the stability of the single cell 10 is improved.

[0030] In one embodiment, the relief hole 142 can be located at the connection between the side surface 121 and the bottom surface 122. From the appearance, the insulating film 14 and the bottom surface 122 are spaced apart. The side surface 121 at the interval between the insulating film 14 and the bottom surface 122 is not coated with the insulating film 14, and the position on the side surface 121 where the insulating film 14 is not provided is used to coat the glue 30. The bottom surface 122 of the housing 12 is also coated with the glue 30. In this way, the glue on the side surface 121 and the glue 30 on the bottom surface 122 form a whole and support each other, and the housing 12 and the box body 20 are directly bonded together.

[0031] As Figure 4 shown, the distance between the insulating film 14 and the bottom surface 122 is L1, and the height of the side surface 121 is H1. For example, 0, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 0.95, etc. It can be understood that The larger the value is, the larger the area on the side surface 121 that is not covered with the insulating film 14. In this way, the area coated with the glue 30 is larger, thereby further improving the bonding strength. In addition, the glue 30 itself also has insulating properties, so such a setting will not reduce the insulation effect of the single battery 10.

[0032] Furthermore, multiple single batteries 10 are arranged at intervals. The interval space between the single batteries 10 allows the glue 30 to enter normally and smoothly. The insulating film 14 and the bottom surface 122 are arranged at intervals, and the glue 30 is filled between the side surfaces 121 of adjacent single batteries 10. The side surfaces 121 of adjacent single batteries 10 are connected into a whole through the glue 30. In this embodiment, the glue 30 is also coated on the side surface 121. The single batteries 10 at the middle positions among multiple single batteries 10 are directly bonded together through the glue 30, improving the bonding strength between them, thereby increasing the lateral restraint between multiple single batteries 10. Together with the glue 30 with vertical restraint on the bottom surface 122, the fixing of the single battery 10 is completed to prevent the single battery 10 from shaking.

[0033] In one embodiment, the bottom surface 122 is provided with a frosted structure at the position for contacting the glue. The frosted structure is a fine concavo-convex structure. The frosted structure can increase the contact area between the bottom surface 122 and the glue 30. Theoretically, the contact area between the bottom surface 122 and the glue 30 can be increased by more than one time. Therefore, the connection strength between the bottom surface 122 and the glue 30 can be increased by at least more than one time.

[0034] In one embodiment, the included angle between the side surface 121 and the bottom surface 122 is an obtuse angle. That is, the side surface 121 gradually expands outward in the direction from the bottom surface 122 to the opening 123, and the opposite side surfaces 121 are away from each other. In this way, the side surface 121 and the solidified glue 30 form an inverted mating structure, improving the connection strength between the housing 12 and the glue 30.

[0035] The side surface 121 is provided with a frosted structure at the position corresponding to the avoidance hole 142, that is, the frosted structure is provided at the position where the insulating film 14 is not provided. The frosted structure is a fine concavo-convex structure. The frosted structure can increase the contact area between the side surface 121 and the glue 30. Theoretically, the contact area between the side surface 121 and the glue 30 can be increased by more than one time. Therefore, the connection strength between the side surface 121 and the glue 30 can be increased by at least more than one time.

[0036] Further, the distance between the bottom surface 122 and the box body 20 is L2 millimeters, where 1 ≤ L2 ≤ 3, such as 1, 1.5, 2, 2.5, 3, etc. It can be understood that the distance between the bottom surface 122 and the box body 20 is used to fill the glue 30 to bond the bottom surface 122 and the box body 20 together. Therefore, if the distance is too small, there will be too little glue 30 to bond the housing 12 and the box body 20 together. If the distance is too large, there will be too much glue 30, and its own strength will be reduced, thus unable to bond the housing 12 and the box body 20 together. Therefore, within the above protection range of the distance, the bonding strength between the housing 12 and the box body 20 can be maximally ensured.

[0037] Further, the depth of the box body 20 is H2, and the thickness displacement of the glue 30 is D. For example, 0.1, 0.15, 0.2, 0.25, 0.3, etc. The glue 30 within this range does not occupy too much space of the box body 20, and can also vertically and horizontally restrain the bottom surface 122 and the side surface 121 of the housing 12, improving the space utilization efficiency of the box body 20.

[0038] In order to enable those skilled in the art to have a further understanding of the present utility model, the applicant will explain the specific assembly process of the battery pack.

[0039] Clean the box body 20 and check the sealing performance of the bottom of the box body 20. Wrap the insulating film 14 on the side surface 121 of the housing 12, and expose the bottom surface 122 of the housing 12. Place multiple single cells 10 at intervals in the box body 20 and keep a distance of L2 from the bottom of the box body 20. Introduce the glue 30 into the box body 20, and after the glue 30 solidifies, bond the single cells 10 and the box body 20 together.

[0040] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present utility model are only used to explain the relative positional relationship and movement conditions between components in a specific posture. If this specific posture changes, the directional indication will also change accordingly.

[0041] It also should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or there may be an intermediate element at the same time. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or can also be indirectly connected to the other element through an intermediate element.

[0042] In addition, the descriptions involving "first", "second", etc. in the present utility model are only for descriptive purposes and should not be construed as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. Additionally, the technical solutions between various embodiments may be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0043] The above are only the preferred embodiments of the present utility model, and do not thus limit the patent scope of the present utility model. Any equivalent structural transformation made under the inventive concept of the present utility model by using the content of the specification and drawings of the present utility model, or any direct / indirect application in other related technical fields is included within the patent protection scope of the present utility model.

Claims

1. A single cell battery, characterized in that: include: The shell comprises a side surface and a bottom surface, wherein the side surface is arranged around the edge of the bottom surface; as well as The insulating film is coated on the side surface, and the bottom surface is used for direct contact with the glue.

2. The single cell according to claim 1, characterized in that: The insulating film is provided with an avoidance hole, and the side surface corresponds to the position of the avoidance hole and is used for contacting with the glue.

3. The single cell according to claim 2, characterized in that: The avoidance hole is located at the connection between the side surface and the bottom surface, the distance between the insulating film and the bottom surface is L1, and the height of the side surface is H1.

4. The single cell according to claim 1, characterized in that: A frosted structure is provided at a position of the bottom surface for contacting with glue.

5. The single cell according to claim 2, characterized in that: The included angle between the side surface and the bottom surface is an obtuse angle.

6. The single cell according to claim 2, characterized in that: A frosted structure is provided at a position of the side surface corresponding to the avoidance hole.

7. A battery pack, characterized in that: The battery pack comprises: a box body and a plurality of single cells according to any one of claims 1 to 6, wherein the plurality of single cells are placed in the box body, and a glue layer is formed between the box body and the bottom surface by curing the glue.

8. The battery pack according to claim 7, characterized in that: The plurality of single cells are arranged at intervals, the insulating film and the bottom surface are arranged at intervals, and the glue is filled between the side surfaces of the adjacent single cells.

9. The battery pack according to claim 7, characterized in that: The distance between the bottom surface and the box body is L2, 1mm≤L2≤3mm.

10. The battery pack according to claim 7, characterized in that: The depth of the box is H2, The thickness displacement D of the glue,

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