Battery pack

Abstract

The utility model discloses a battery pack. The battery pack comprises a box body, a bracket and single batteries, an accommodating cavity is formed in the box body; the support is fixedly arranged in the containing cavity and provided with a limiting cavity. The single batteries are placed in the containing cavities and correspondingly arranged in the limiting cavities, and the single batteries abut against and are fixed to the inner circumferential walls of the limiting cavities. According to the utility model, the single batteries are placed into the limiting cavities corresponding to the brackets, and the single batteries are propped against and fixed with the inner peripheral walls of the limiting cavities, so that the single batteries are limited, and the mounting of the single batteries is completed after the brackets are fixedly arranged in the accommodating cavities, so that the single batteries are prevented from shaking.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and particularly relates to 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 likely to shake and misalign, resulting in a decline in electrical conductivity. Content of the Utility Model

[0003] An object of the utility model is to provide a battery pack, aiming at solving the technical problem of the stability of single cells in the battery pack.

[0004] To achieve the above object, a solution provided by the utility model is: a battery pack, which includes a box body, a bracket and single cells; the box body is provided with a receiving cavity; the bracket is fixedly arranged in the receiving cavity, and the bracket is provided with a limiting cavity; the single cells are placed in the receiving cavity and correspondingly arranged in the limiting cavity, and the single cells are in abutting connection and fixed with the inner peripheral wall of the limiting cavity.

[0005] Optionally, the bracket includes a limiting wall and a supporting wall. The limiting wall and the supporting wall are connected to form the limiting cavity. The supporting wall is provided with an opening communicating with the limiting cavity. The single cells are assembled in the limiting cavity. The bracket and the single cells are directly connected to the box body through glue curing respectively. The glue is directly connected to the bottom of the single cells through the opening.

[0006] Optionally, there are multiple limiting cavities which are spaced from each other, and the number of single cells is multiple and they are respectively arranged in multiple limiting cavities and in abutting connection and fixed with the inner peripheral wall of the limiting cavities.

[0007] Optionally, the bottom of the single cell abuts against the supporting wall, and there is a gap between the side part of the single cell and the limiting wall. The glue further fills the gap between the side part of the single cell and the limiting wall.

[0008] Optionally, the bottom area of the single cell is S1, and the area of the opening is S2.

[0009] Optionally, the distance between the bottom of the single cell and the bottom of the box body is L1, 3mm ≤ L1 ≤ 5mm, and the distance between the bottom of the bracket and the bottom of the box body is L2, 1mm ≤ L2 ≤ 2mm.

[0010] Optionally, the included angle between the side part and the bottom of the single cell is an obtuse angle.

[0011] Optionally, the battery pack further includes an insulating film, and the insulating film covers the side part of the single cell.

[0012] Optionally, the insulating film is provided with an avoidance hole, and the side portion of the single battery corresponding to the position of the avoidance hole is used to contact the glue.

[0013] Optionally, a matte structure is provided at the position where the single battery is used to contact the glue.

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

[0015] The bracket and the box body are fixed together. The fixing method can be bonding, or screw or rivet connection. The single battery is placed in the accommodation cavity and correspondingly arranged to be connected with the bracket in the limiting cavity. The single battery abuts and fixes against the inner peripheral wall of the limiting cavity. The bracket limits the position of the single battery to prevent the single battery from shaking, ensuring that the single battery is always at a predetermined working position, so as to ensure the stable battery performance of the single battery and normal discharge. 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 use in the description of the embodiments or the prior art. Obviously, the following drawings 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 according to the structures shown in these drawings.

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

[0018] Figure 2 is a schematic exploded structure diagram of the battery pack provided by the embodiment of the present utility model;

[0019] Figure 3 is a schematic cross-sectional structure diagram of the battery pack provided by the embodiment of the present utility model;

[0020] Figure 4 is provided by the embodiment of the present utility model Figure 3 partial enlarged schematic diagram of area A in;

[0021] Figure 5 is a schematic structure diagram of the single battery provided by the embodiment of the present utility model;

[0022] Figure 6 is a schematic structure diagram of the bracket provided by the embodiment of the present utility model.

[0023] Explanation of the reference numerals in the drawings:

[0024] Box body 20, accommodation cavity 201, glue 30, single cell 10, housing 12, side part 121, bottom part 122, insulating film 50, avoidance hole 501, bracket 40, limiting wall 41, supporting wall 42, opening 44 of limiting cavity 43. Detailed implementation mode

[0025] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work belong to the scope of protection of the present invention.

[0026] Please refer to Figures 1 to 4 as shown in Figure 1 is a schematic assembly structure diagram of a battery pack provided by an embodiment of the present invention, Figure 2 is a schematic exploded structure diagram of a battery pack provided by an embodiment of the present invention, Figure 3 is a schematic cross-sectional structure diagram of a battery pack provided by an embodiment of the present invention, Figure 4 is provided by an embodiment of the present invention Figure 3 a partial enlarged schematic diagram of area A in Figure 5 is a schematic structure diagram of a single cell provided by an embodiment of the present invention, Figure 6 is a schematic structure diagram of the bracket 40 provided by an embodiment of the present invention.

[0027] An implementation scheme of the present invention provides a battery pack, which includes a box body 20, a bracket 40 and a single cell 10. The box body 20 is provided with an accommodation cavity 201. The bracket 40 is fixedly arranged in the accommodation cavity 201 and connected to the box body 20. The bracket 40 is provided with a limiting cavity 43. The single cell 10 is placed in the accommodation cavity 201 and correspondingly arranged in the limiting cavity 43 and connected to the bracket 40. The single cell 10 is in contact with and fixed to the inner peripheral wall of the limiting cavity 43.

[0028] In this embodiment, the bracket 40 and the box body 20 are fixed together. The fixing method can be bonding, or screw or rivet connection. The single cell 10 is placed in the accommodation cavity 201 and correspondingly arranged in the limiting cavity 43 and connected to the bracket 40. The single cell 10 is in contact with and fixed to the inner peripheral wall of the limiting cavity 43. The bracket 40 limits the position of the single cell 10 to prevent the single cell 10 from shaking, ensuring that the single cell 10 is always at a predetermined working position, so as to ensure the stable and normal discharge of the battery performance of the single cell 10.

[0029] Furthermore, the battery pack further includes glue 30, which is directly connected to the box body 20 and the bracket 40 respectively. The glue 30 is directly connected to the bottom 122 of the box body 20 and the single battery 10 respectively. After the glue 30 cures, a glue layer is formed. Of course, the glue 30 also directly connects the bracket 40 and the box body 20 together. The glue 30 has viscosity, and the types of the glue 30 mainly include polyurethane structural adhesive, acrylic structural adhesive, silica gel, epoxy structural adhesive, UV glue, high-temperature resistant hot melt adhesive, polyurethane glue, silicone rubber, two-component epoxy resin, hot melt adhesive, etc. The single battery 10 has a bottom 122 and a side 121, and the side 121 is connected around the edge of the bottom 122 to form a cavity.

[0030] In this embodiment, the bottom 122 of the single battery 10 is in an exposed state, and the bottom 122 of the single battery 10 is not coated with an insulating film 50. The single battery 10 is placed on the bracket 40, and its bottom 122 is in direct contact with the glue. The bracket 40 can set the thickness of the glue according to the bonding strength requirements. During the process of assembling the single battery 10 and the bracket 40 into the box body 20, the box body 20 is filled with glue, and the glue is between the bottom 122 of the single battery 10 and the box body 20. After the glue solidifies, the bottom 122 of the single battery 10 and the box body 20 are directly bonded together, and the bracket 40 and the box body 20 are directly bonded together, with high bonding strength, effectively increasing the vertical constraint of the single battery 10 in the box body 20. Compared with the bottom 122 of the single battery 10 being coated with an insulating film 50, there is no medium constraint between the insulating film 50 and the bottom 122 of the single battery 10. Therefore, there is no direct constraint relationship between the single battery 10 and the box body 20. In this application, the bottom 122 of the single battery 10 and the box body 20 are directly bonded together with an increased medium constraint, improving the bonding strength between the single battery 10 and the box body 20. In addition, compared with the schemes of the insulating film 50 with and without openings, the present utility model also reduces the packaging cost of the single battery 10.

[0031] In one embodiment, the bracket 40 includes a limiting wall 41 and a supporting wall 42. The limiting wall 41 and the supporting wall 42 are connected to form a limiting cavity 43. The supporting wall 42 is provided with an opening 44 communicating with the limiting cavity 43. The single battery is assembled in the limiting cavity 43, and the glue is connected to the bottom of the single battery through the opening 44. The limiting cavity 43 is mainly used to limit the single battery 10 to ensure that the single battery 10 is at a preset position. The cross-sectional shape of the limiting cavity 43 can be the same as the cross-sectional shape of the single battery 10, for example, both are square. The cross-sectional shape of the limiting cavity 43 can also be different from the cross-sectional shape of the single battery 10. For example, the cross-sectional shape of the limiting cavity 43 is square, and the cross-sectional shape of the single battery 10 is circular. The opening 44 is arranged on the supporting arm and is directly communicated with the limiting cavity 43. The glue 30 can overflow into the limiting cavity 43 through the opening 44 and be in direct contact connection with the bottom of the single battery 10.

[0032] The included angle between the limiting wall 41 and the supporting wall 42 can be greater than 90 degrees, and the range can be between 90 and 100 degrees, it should be noted that 90 degrees and 100 degrees are not included. Thus, the limiting cavity 43 can form a flared shape from top to bottom, and the limiting wall 41 plays a guiding role to facilitate the assembly of the single battery 10 into the limiting cavity 43.

[0033] Further, there are multiple limiting cavities 43 and they are spaced from each other. The number of single batteries is multiple and they are respectively and spacedly arranged in the multiple limiting cavities 43 and are in contact and fixed with the inner peripheral wall of the limiting cavity 43. The number of limiting walls 41 is multiple, and the multiple limiting walls 41 are laid crosswise on the supporting wall 42. There are multiple openings 44 formed on the supporting wall 42, and each limiting cavity 43 is provided with an opening 44, so as to ensure that glue can enter each limiting cavity 43.

[0034] The multiple single batteries 10 are spaced by the limiting walls 41. The spaced space between the single batteries 10 allows the glue 30 to enter normally and smoothly, and also allows air to pass through, thereby improving the heat dissipation efficiency between the single batteries 10. In this embodiment, the multiple single batteries 10 can be respectively installed on the bracket 40 and then the whole is transported to the box body 20, improving the efficiency. In addition, the multiple limiting cavities 43 are arranged on the bracket 40, ensuring the consistency of the positions between the multiple limiting cavities 43, and further ensuring that the single batteries 10 can be assembled at the predetermined positions, improving the assembly accuracy.

[0035] Further, the bottom 122 of the single battery abuts against the supporting wall 42, and the side part 121 of the single battery is spaced from the limiting wall 41. The glue is further filled between the side part 121 of the single battery and the limiting wall 41. The glue 30 is filled between the limiting wall 41 and the side part 121 of the single battery 10, and the limiting wall 41 and the side part 121 of the single battery 10 are connected into a whole through the glue 30. In this embodiment, the side part 121 of the single battery 10 is spaced from the limiting wall 41 to facilitate the installation of the single battery 10 into the limiting cavity 43. In addition, the side part 121 of the single battery 10 is also coated with the glue 30, connecting the multiple single batteries 10 and the bracket 40 into a whole transversely, improving the bonding strength between the single battery and the bracket 40, thereby increasing the transverse constraint between the multiple single batteries 10, and jointly with the glue 30 with vertical constraint on the bottom 122 to complete the fixation of the single battery 10 and prevent the single battery 10 from shaking.

[0036] Of course, in some cases, the bottom 122 of the single battery 10 abuts against the supporting wall 42, the side part 121 of the single battery abuts against the limiting wall 41, and the single battery 10 and the bracket 40 are not fixed through the glue 30.

[0037] In one embodiment, the area of the bottom 122 of the single cell 10 is S1, and the area of the opening 44 is S2. The value of can be 0.7, 0.75, 0.8, 0.85, 0.9, 0.95. Within this range, the support wall 42 can play a certain supporting role for the single cell 10, and the area where the bottom 122 of the single cell 10 contacts the glue through the opening 44 is also ensured, thereby ensuring reliable bonding strength.

[0038] Further, the distance between the bottom 122 of the single cell 10 and the box body 20 is L1 millimeters, 3 ≤ L2 ≤ 5, such as 3, 3.5, 4, 4.5, 5, etc. The distance between the bracket 40 and the bottom 122 of the box body 20 is L2, 1mm ≤ L2 ≤ 2mm, such as 1, 1.2, 1.4, 1.6, 1.8, 2, etc. L2 specifically refers to the support wall 42 and the bottom 122 of the box body 20. It can be understood that the space between the bottom 122 and the box body 20 is for filling the glue 30, and the space between the support wall 42 and the bottom 122 of the box body 20 is for filling the glue 30 to bond the bottom 122 and the box body 20 together and bond the bracket 40 and the box body 20 together. Therefore, too small a distance will result in too little glue 30 to bond the single cell 10 and the bracket 40 to the box body 20 respectively, and too large a distance will result in too much glue 30, and its own strength will be reduced, thus unable to bond the single cell 10 and the bracket 40 to the box body 20 respectively. Therefore, the distance within the above protection range can maximize the bonding strength between the single cell 10 and the bracket 40 and the box body 20 respectively.

[0039] In one embodiment, the included angle between the side portion 121 and the bottom 122 is an obtuse angle. That is, the side portion 121 gradually expands outward from the direction away from the bottom 122, and the opposite side portions 121 are away from each other to form a flared shape. In this way, the side portion 121 and the solidified glue 30 form an inverted mating structure, improving the connection strength between the single cell 10 and the glue 30.

[0040] Specifically, the battery pack further includes an insulating film 50. The insulating film 50 covers the outer surface of the side portion 121. The single cell 10 can be square or circular, etc. The opening 44123 is opposite to the bottom 122. The insulating film 50 is not provided on the bottom 122, and the bottom 122 is in a bare state. The glue 30 is applied on the bottom 122, and the glue 30 directly bonds the bottom 122 and the box body 20 together.

[0041] In this embodiment, the bottom 122 of the single cell 10 is in an exposed state, the bottom 122 of the single cell 10 is not coated with an insulating film 50, and the bottom 122 of the single cell 10 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 located between the bottom 122 of the single cell 10 and the box body 20. After the glue solidifies, the bottom 122 of the single cell 10 and the box body 20 are directly bonded together, and the bonding strength is high. Compared with the bottom 122 of the single cell 10 being coated with an insulating film 50, there is no medium constraint between the insulating film 50 and the bottom 122 of the single cell 10. Therefore, there is no direct constraint relationship between the single cell 10 and the box body 20. In this application, the bottom 122 of the single cell 10 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 solutions of the insulating film 50 having an opening 44 and not having an opening 44, the present utility model also reduces the film coating cost of the single cell 10.

[0042] In one embodiment, the insulating film 50 is provided with a relief hole 501, and the position of the side portion 121 corresponding to the relief hole 501 is used to contact the glue, and the relief hole 501 allows a part of the side portion 121 to be coated with the insulating film 50. The relief hole 501 can be circular, or can be other shapes such as square. The number of the relief holes 501 can be one, or can be a plurality of spaced apart from each other. By providing the relief holes 501 on the insulating film 50, the exposed area of the side portion 121 is increased to ensure that the glue and the side portion 121 are directly contact-bonded together, thereby further improving the stability of the single cell 10. In this embodiment, glue 30 is also coated on the side portion 121, so as to increase the lateral constraint of the single cell 10, and together with the glue 30 with a vertical constraint on the bottom 122, the fixing of the single cell 10 is completed, and the stability of the single cell 10 is improved.

[0043] In one embodiment, the relief hole 501 can be located at the connection between the side portion 121 and the bottom 122. From the appearance, the insulating film 50 and the bottom 122 are spaced apart. The side portion 121 at the interval between the insulating film 50 and the bottom 122 is not coated with the insulating film 50, and the position on the side portion 121 where the insulating film 50 is not provided is used to coat the glue 30. The bottom 122 of the housing 12 is also coated with the glue 30. In this way, the glue on the side portion 121 and the glue 30 on the bottom 122 form a whole, support each other, and directly bond the housing 12 and the box body 20 together.

[0044] As Figure 5 shown, the distance between the insulating film 50 and the bottom 122 is L3, and the height of the side portion 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 portion 121 without the insulating film 50 is, so the area for applying 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 cell 10.

[0045] A matte structure is provided at the position of the single cell 10 for contacting the glue 30.

[0046] Specifically, a matte structure is provided at the position of the bottom portion 122 for contacting the glue. The matte structure is a fine concavo-convex structure. The matte structure can increase the contact area between the bottom portion 122 and the glue 30. Theoretically, the contact area between the bottom portion 122 and the glue 30 can be increased by more than one time, so the connection strength between the bottom portion 122 and the glue 30 can be increased by at least more than one time.

[0047] A matte structure is provided at the position of the side portion 121 corresponding to the avoidance hole 501, that is, at the position where the insulating film 50 is not provided. The matte structure is a fine concavo-convex structure. The matte structure can increase the contact area between the side portion 121 and the glue 30. Theoretically, the contact area between the side portion 121 and the glue 30 can be increased by more than one time, so the connection strength between the side portion 121 and the glue 30 can be increased by at least more than one time.

[0048] Furthermore, 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 vertically and horizontally restrain the bottom portion 122 and the side portion 121 of the housing 12, improving the space utilization efficiency of the box body 20.

[0049] 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.

[0050] Clean the box body 20 and check the sealing performance of the bottom of the box body 20. Wrap the insulating film 50 on the side portion 121 of the single cell 10, and expose the bottom portion 122 of the housing 12. Place multiple single cells 10 at intervals in the bracket 40. Introduce the glue 30 into the box body 20, and after the glue 30 solidifies, bond the single cell 10 and the bracket 40 to the box body 20 respectively.

[0051] It should be noted that all the 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 certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0052] It should also be noted that when an element is referred to as "fixed to" or "disposed on" another element, it can be directly on the other element or there may be an intermediate element present at the same time. When an element is referred to as "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element through an intermediate element.

[0053] 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 of such features. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement them. 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.

[0054] The above are only the preferred embodiments of the present utility model, and do not limit the patent scope of the present utility model accordingly. 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 direct / indirect application in other related technical fields is included in the patent protection scope of the present utility model.

Claims

1. A battery pack, characterized in that, The battery pack includes: A box body provided with a receiving cavity; A bracket fixedly arranged in the receiving cavity, the bracket being provided with a limiting cavity; A single battery placed in the receiving cavity and correspondingly arranged in the limiting cavity, the single battery being in abutting connection and fixed with the inner peripheral wall of the limiting cavity.

2. The battery pack according to claim 1, characterized in that, The bracket includes a limiting wall and a supporting wall, the limiting wall and the supporting wall being connected to form the limiting cavity, the supporting wall being provided with an opening communicating with the limiting cavity, the single battery being assembled in the limiting cavity, the bracket and the single battery being directly connected to the box body through glue curing respectively, and the glue being directly connected to the bottom of the single battery through the opening.

3. The battery pack according to claim 1, wherein, There are a plurality of the limiting cavities which are spaced from each other, and the number of the single batteries is a plurality and are respectively arranged at intervals in the plurality of limiting cavities and in abutting connection and fixed with the inner peripheral wall of the limiting cavity.

4. The battery pack according to claim 2, characterized in that, The bottom of the single battery abuts against the supporting wall, the side portion of the single battery and the limiting wall are spaced apart, and the glue is further filled between the side portion of the single battery and the limiting wall.

5. The battery pack according to claim 2, characterized in that, The bottom area of the single cell is S1, and the area of the opening is S2.

6. The battery pack according to claim 1, characterized in that, The distance between the bottom of the single battery and the bottom of the box body is L1, 3 mm ≤ L1 ≤ 5 mm, and the distance between the bracket and the bottom of the box body is L2, 1 mm ≤ L2 ≤ 2 mm.

7. The battery pack according to claim 4, characterized in that The included angle between the side portion and the bottom of the single battery is an obtuse angle.

8. The battery pack according to claim 1, wherein, The battery pack further includes an insulating film which covers the side portion of the single battery.

9. The battery pack according to claim 8, characterized in that, The insulating film is provided with an avoidance hole, and the position of the side portion of the single battery corresponding to the avoidance hole is used for contacting with the glue.

10. The battery pack according to claim 1, wherein A frosted structure is arranged at the position of the single battery for contacting with the glue.

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