Battery pack

Abstract

The present application discloses a battery pack. The battery pack comprises a box body, a support, and a battery cell. The box body is provided with an accommodating cavity. The support is fixedly arranged in the accommodating cavity. The support is provided with a limiting cavity. The battery cell is placed in the accommodating cavity and correspondingly arranged in the limiting cavity. The battery cell abuts against and is fixed to an inner peripheral wall of the limiting cavity. According to the present application, the battery cell is placed in the limiting cavity corresponding to the support and abuts against and is fixed to the inner peripheral wall of the limiting cavity, and then the support is fixedly arranged in the accommodating cavity, so as to prevent the battery cell from shaking.

Description

Battery pack

[0001] The present application claims priority to the Chinese patent application No. 2024111321847, filed on August 16, 2024, with the Chinese Patent Office, the whole content of which is incorporated herein by reference. TECHNICAL FIELD

[0002] The present application relates to the technical field of batteries, in particular to a battery pack. BACKGROUND

[0003] New energy is accepted by more and more people as clean energy and is popularized on a large scale in various industries. The most widely used new energy is lithium batteries, which are applied to various electric products. TECHNICAL PROBLEM

[0004] Lithium batteries will move with the electric products during use, so if they are not fixed firmly, they will easily shake and dislocate, resulting in a decrease in the conductivity. TECHNICAL SOLUTION

[0005] The present application provides a battery pack, which comprises a box body, a support and a single battery. The box body is provided with a containing cavity. The support is fixedly arranged in the containing cavity and is provided with a limiting cavity. The single battery is placed in the containing cavity and is arranged in the limiting cavity correspondingly, and the single battery is fixedly abutted with the inner circumferential wall of the limiting cavity. ADVANTAGEOUS EFFECTS

[0006] The battery pack provided by the present application has the following advantageous effects: the support and the box body are fixed together, and the fixing mode can be adhesion or screw or rivet connection. The single battery is placed in the containing cavity and is arranged in the limiting cavity correspondingly and connected with the support, and the single battery is fixedly abutted with the inner circumferential wall of the limiting cavity. The support limits the position of the single battery, prevents the single battery from shaking, and ensures that the single battery is always at the predetermined working position, so as to ensure the stable battery performance of the single battery and normal discharge. BRIEF DESCRIPTION OF DRAWINGS

[0007] Fig. 1 is an assembly structure schematic diagram of the battery pack provided by the present application;

[0008] Fig. 2 is an exploded structure schematic diagram of the battery pack provided by the present application;

[0009] Fig. 3 is a cross-sectional structure schematic diagram of the battery pack provided by the present application;

[0010] Fig. 4 is a local enlarged schematic diagram of the area A in Fig. 3 provided by the present application;

[0011] Fig. 5 is a structure schematic diagram of the single battery provided by the present application;

[0012] Fig. 6 is a structural schematic diagram of the bracket provided by the present application.

[0013] Explanation of reference numerals:

[0014] The box 20, the accommodating cavity 201, the glue 30, the single battery 10, the shell 12, the side portion 121, the bottom portion 122, the insulating film 50, the avoiding hole 501, the bracket 40, the limiting wall 41, the supporting wall 42, the limiting cavity 43, and the opening 44. Embodiment of the present application

[0015] Please refer to Figs. 1-4, Fig. 1 is an assembly structural schematic diagram of the battery pack provided by the present application, Fig. 2 is an exploded structural schematic diagram of the battery pack provided by the present application, Fig. 3 is a cross-sectional structural schematic diagram of the battery pack provided by the present application, Fig. 4 is a partial enlarged schematic diagram of area A in Fig. 3 provided by the present application, Fig. 5 is a structural schematic diagram of the single battery provided by the present application, and Fig. 6 is a structural schematic diagram of the bracket 40 provided by the present application.

[0016] The present application provides a battery pack, which comprises a box 20, a bracket 40, and a single battery 10. The box 20 is provided with an accommodating cavity 201. The bracket 40 is fixedly arranged in the accommodating cavity 201 and connected with the box 20. The bracket 40 is provided with a limiting cavity 43. The single battery 10 is arranged in the accommodating cavity 201 and connected with the bracket 40 in the limiting cavity 43. The single battery 10 is fixedly arranged against the inner circumferential wall of the limiting cavity 43.

[0017] In the present embodiment, the bracket 40 and the box 20 are fixed together, which can be fixed by adhesion, screw connection, or rivet connection. The single battery 10 is arranged in the accommodating cavity 201 and connected with the bracket 40 in the limiting cavity 43. The single battery 10 is fixedly arranged against the inner circumferential wall of the limiting cavity 43. The bracket 40 limits the position of the single battery 10, prevents the single battery 10 from shaking, and ensures that the single battery 10 is always in the predetermined working position, so as to ensure that the single battery 10 is stably discharged.

[0018] The battery pack further comprises glue 30. The glue 30 is directly connected with the box 20 and the bracket 40, respectively. The glue 30 is directly connected with the box 20 and the bottom portion 122 of the single battery 10, respectively. The glue 30 forms a glue layer after solidification. Of course, the glue 30 also directly connects the bracket 40 and the box 20 together. The glue 30 has adhesion. The types of the glue 30 mainly include polyurethane structural glue, acrylic structural glue, silicone glue, epoxy structural glue, UV glue, high-temperature resistant hot melt glue, polyurethane glue, silicone rubber, two-component epoxy resin, and hot melt glue, etc. The single battery 10 has a bottom portion 122 and a side portion 121. The side portion 121 is annularly arranged at the edge of the bottom portion 122 to form a cavity.

[0019] In the embodiment, the bottom 122 of the single battery 10 is in a bare state, the bottom 122 of the single battery 10 is not covered by the insulating film 50, the single battery 10 is placed on the bracket 40, the bottom 122 of the single battery 10 is in direct contact with the glue, and the bracket 40 can be provided with a thickness of the glue according to the bonding strength requirement. In the process of assembling the single battery 10 and the bracket 40 to the box 20, the box 20 is filled with the glue, and the glue is between the bottom 122 of the single battery 10 and the box 20. After the glue solidifies, the bottom 122 of the single battery 10 and the box 20 are directly bonded together, and the bracket 40 and the box 20 are directly bonded together, the bonding strength is high, and the vertical constraint of the single battery 10 in the box 20 is effectively increased. Compared with the bottom 122 of the single battery 10 covered by the insulating film 50, there is no medium constraint between the insulating film 50 and the bottom 122 of the single battery 10, and there is no direct constraint relationship between the single battery 10 and the box 20. The bottom 122 of the single battery 10 and the box 20 of the application are directly bonded together by increasing the medium constraint, and the bonding strength between the single battery 10 and the box 20 is improved. In addition, compared with the opening and non-opening schemes of the insulating film 50, the film coating cost of the single battery 10 is also reduced.

[0020] In an 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 with the bottom of the single battery through the opening 44. The limiting cavity 43 is mainly arranged to limit the single battery 10, and ensure that the single battery 10 is at a predetermined 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 directly communicates with the limiting cavity 43, and the glue 30 can overflow into the limiting cavity 43 through the opening 44 and be in direct contact with the bottom of the single battery 10.

[0021] The included angle between the limiting wall 41 and the supporting wall 42 can be greater than 90 degrees, and the range can be 90 to 100 degrees, and it is worth noting that 90 degrees and 100 degrees are not included, so that the limiting cavity 43 can form a horn mouth shape from top to bottom, so that the limiting wall 41 plays a guiding role to facilitate the assembly of the single battery 10 into the limiting cavity 43.

[0022] The plurality of limiting cavities 43 are spaced apart from each other, and the plurality of single batteries are arranged in the plurality of limiting cavities 43 respectively and fixed by the inner circumferential wall of the limiting cavities 43. The plurality of limiting walls 41 are arranged on the supporting wall 42 in a cross manner, and the plurality of openings 44 are arranged on the supporting wall 42, and each of the limiting cavities 43 is provided with an opening 44, so as to ensure that the glue can enter each of the limiting cavities 43.

[0023] The plurality of single batteries 10 are arranged by the limiting walls 41, and the spacing between the single batteries 10 can allow the glue 30 to enter normally and smoothly, and can also allow air to pass through, so as to improve the heat dissipation efficiency between the single batteries 10. In the embodiment, the plurality of single batteries 10 can be arranged on the support 40 respectively and then carried into the box 20 as a whole, and the efficiency is improved. In addition, the plurality of limiting cavities 43 are arranged on the support 40, the consistency of the positions between the plurality of limiting cavities 43 is ensured, and then the single batteries 10 can be assembled at the predetermined positions, and the assembly accuracy is improved.

[0024] The bottom 122 of the single battery abuts against the supporting wall 42, and the side 121 of the single battery is arranged in a spaced-apart manner with the limiting wall 41, and the glue is filled between the side 121 of the single battery and the limiting wall 41. The glue 30 is filled between the limiting wall 41 and the side 121 of the single battery 10, and the limiting wall 41 and the side 121 of the single battery 10 are connected into a whole through the glue 30. In the embodiment, the side 121 of the single battery 10 is arranged in a spaced-apart manner with the limiting wall 41 to facilitate the single battery 10 to be arranged into the limiting cavity 43, and in addition, the side 121 of the single battery 10 is also coated with the glue 30, so as to connect the plurality of single batteries 10 into a whole from the horizontal direction with the support 40, improve the bonding strength between the single battery and the support 40, thereby increasing the horizontal constraint between the plurality of single batteries 10, and the glue 30 on the bottom 122 vertically fixes the single battery 10, so as to prevent the single battery 10 from shaking.

[0025] Of course, in some cases, the bottom 122 of the single battery 10 abuts against the supporting wall 42, the side 121 of the single battery abuts against the limiting wall 41, and the single battery 10 and the support 40 are not fixed by the glue 30.

[0026] In an embodiment, the area of the bottom 122 of the single battery 10 is S1, the area of the opening 44 is S2, and 0.7≤S2 / S1≤0.95. ​The value of the number can be 0.7, 0.75, 0.8, 0.85, 0.9, 0.95, within the range, the support wall 42 can play a certain supporting role to the single battery 10, the bottom 122 of the single battery 10 is guaranteed through the opening 44 and the area of the contact of the glue, so as to ensure the reliable bonding strength.

[0027] The distance between the bottom 122 of the single battery 10 and the box 20 is L1 mm, 3≤L2≤5, for example, 3, 3.5, 4, 4.5, 5, etc. The distance between the bracket 40 and the bottom 122 of the box 20 is L2, 1mm≤L2≤2mm, for example, 1, 1.2, 1.4, 1.6, 1.8, 2, etc. L2 is the distance between the support wall 42 and the bottom 122 of the box 20. It can be understood that the distance between the bottom 122 and the box 20 is arranged to fill the glue 30, and the distance between the support wall 42 and the bottom 122 of the box 20 is arranged to fill the glue 30, so as to bond the bottom 122 and the box 20 together and bond the bracket 40 and the box 20 together. Therefore, too little distance will cause too little glue 30 to bond the single battery 10 and the bracket 40 to the box 20 respectively, and too much distance will cause too much glue 30, and the self-strength will be reduced, so that the single battery 10 and the bracket 40 cannot be bonded to the box 20 respectively. Therefore, within the protection scope provided in the present application, the distance can maximize the bonding strength between the single battery 10 and the bracket 40 and the box 20 respectively.

[0028] In an embodiment, the included angle between the side 121 and the bottom 122 is obtuse. That is, the side 121 gradually expands outward from the direction away from the bottom 122, and the opposite sides 121 are away from each other to form a horn shape. In this way, the side 121 and the solidified glue 30 form a reverse buckling structure, which improves the connection strength of the single battery 10 and the glue 30.

[0029] The battery pack further comprises an insulating film 50, which is wrapped on the outer surface of the side 121. The single battery 10 can be square, circular, etc. The opening 44 123 is opposite to the bottom 122. The bottom 122 is not provided with an insulating film 50, and the bottom 122 is in a bare state. The bottom 122 is coated with glue 30, and the glue 30 directly bonds the bottom 122 and the box 20 together.

[0030] In the embodiment, the bottom 122 of the single battery 10 is in a bare state, the bottom 122 of the single battery 10 is not covered by the insulating film 50, and the bottom 122 of the single battery 10 is directly in contact with the glue. During the assembly of the single battery 10 and the box 20, the box 20 is filled with glue, and the glue is between the bottom 122 of the single battery 10 and the box 20. After the glue solidifies, the bottom 122 of the single battery 10 and the box 20 are directly bonded together, and the bonding strength is high. Compared with the bottom 122 of the single battery 10 covered by the insulating film 50, there is no medium constraint between the insulating film 50 and the bottom 122 of the single battery 10, and there is no direct constraint relationship between the single battery 10 and the box 20. The bottom 122 of the single battery 10 and the box 20 of the present application are directly bonded together by increasing the medium constraint, thereby improving the bonding strength between the single battery 10 and the box 20. In addition, compared with the scheme of the insulating film 50 with the opening 44 and without the opening 44, the present application also reduces the film coating cost of the single battery 10.

[0031] In an embodiment, the insulating film 50 is provided with a relief hole 501, the position of the side 121 corresponding to the relief hole 501 is arranged to be in contact with the glue, and the relief hole 501 allows part of the side 121 to be covered by the insulating film 50. The relief hole 501 can be circular, square or other shapes. The number of relief holes 501 can be one or multiple and spaced apart. By arranging the relief hole 501 on the insulating film 50, the area of the side 121 exposed is increased to ensure that the glue and the side 121 are directly bonded together, thereby improving the stability of the single battery 10. In the present embodiment, the side 121 is also coated with glue 30, thereby increasing the lateral constraint of the single battery 10, and the glue 30 on the bottom 122 vertically constrains the single battery 10 together to improve the stability of the single battery 10.

[0032] In an embodiment, the relief hole 501 can be located at the connection between the side 121 and the bottom 122, and the insulating film 50 and the bottom 122 are spaced apart from each other in appearance. The side 121 between the insulating film 50 and the bottom 122 is not covered by the insulating film 50, and the position of the side 121 without the insulating film 50 is arranged to be coated with the glue 30. The bottom 122 of the shell 12 is also coated with the glue 30, so that the glue on the side 121 and the glue 30 on the bottom 122 form an integral whole and support each other to directly bond the shell 12 and the box 20 together.

[0033] As shown in FIG. 5, the distance between the insulating film 50 and the bottom 122 is L3, the height of the side 121 is H1, and 0 ≤0.95. 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 greater the value of the number, the greater the area on the side portion 121 that is not covered by the insulating film 50, and thus the greater the area coated with the adhesive 30, thereby increasing the bonding strength. In addition, the adhesive 30 itself has insulating properties, so this arrangement does not reduce the insulating effect of the individual battery 10.

[0034] The position on the bottom portion 122 that contacts the adhesive is provided with a frosted structure.

[0035] The position on the bottom portion 122 that contacts the adhesive is provided with a frosted structure. The frosted structure is a fine concave-convex structure that increases the contact area between the bottom portion 122 and the adhesive 30, and theoretically increases the contact area between the bottom portion 122 and the adhesive 30 by more than one time, so the connection strength between the bottom portion 122 and the adhesive 30 is increased by at least more than one time.

[0036] The position on the side portion 121 that corresponds to the avoidance hole 501 is provided with a frosted structure, i.e., the position that is not provided with the insulating film 50 is provided with a frosted structure. The frosted structure is a fine concave-convex structure that increases the contact area between the side portion 121 and the adhesive 30, and theoretically increases the contact area between the side portion 121 and the adhesive 30 by more than one time, so the connection strength between the side portion 121 and the adhesive 30 is increased by at least more than one time.

[0037] The depth of the box 20 is H2, and the thickness of the adhesive 30 is D, 0.1≤D≤0.3, for example, 0.1, 0.15, 0.2, 0.25, 0.3, etc. The adhesive 30 in this range does not occupy too much space in the box 20, and can also vertically and horizontally bind the bottom portion 122 and the side portion 121 of the shell 12, thereby improving the space utilization efficiency of the box 20.

[0038] In order to give those skilled in the art a more comprehensive understanding of the present application, the applicant will explain the battery pack assembly process.

[0039] The box 20 is cleaned, and the sealability of the bottom of the box 20 is checked. The insulating film 50 is coated on the side portion 121 of the individual battery 10, and the bottom portion 122 of the shell 12 is exposed. The plurality of individual batteries 10 are placed in the bracket 40 at intervals. The adhesive 30 is introduced into the box 20, and after the adhesive 30 is solidified, the individual battery 10 and the bracket 40 are bonded to the box 20, respectively.​

Claims

1. A battery pack, comprising: a box body having a receiving cavity; a support fixedly arranged in the receiving cavity, the support having a limiting cavity; a single battery placed in the receiving cavity and arranged in the limiting cavity, the single battery being fixedly abutted with an inner circumferential wall of the limiting cavity.

2. The battery pack of claim 1, wherein, The support comprises a limiting wall and a supporting wall, the limiting wall and the supporting wall being connected to form the limiting cavity, the supporting wall having an opening communicating with the limiting cavity, the single battery being assembled in the limiting cavity, the support and the single battery being connected with the box body respectively through curing of glue, the glue being directly connected with a bottom of the single battery through the opening.

3. The battery pack of claim 1, wherein, The limiting cavity has a plurality of limiting cavities spaced from each other, and the single battery has a plurality of single batteries spaced from each other and fixedly abutted with the inner circumferential wall of the limiting cavity.

4. The battery pack of claim 2, wherein, The bottom of the single battery abuts with the supporting wall, and the side of the single battery is spaced from the limiting wall, the glue being filled between the side of the single battery and the limiting wall.

5. The battery pack of claim 2, wherein, The bottom area of the single cell is S1, the area of the opening is S2, 0.7≤ ≤0.

95.

6. The battery pack of claim 1, wherein, The distance between the bottom of the single battery and the bottom of the box body is L1, 3mm≤L1≤5mm, and the distance between the support and the bottom of the box body is L2, 1mm≤L2≤2mm.

7. The battery pack of claim 4, wherein, The included angle between the side of the single battery and the bottom of the single battery is obtuse. 8.The battery pack of claim 1, further comprising an insulating film covering the side of the single battery.

9. The battery pack of claim 8, wherein, The insulating film has an avoiding hole, and the side of the single battery is arranged to be in contact with the glue at a position corresponding to the avoiding hole.

10. The battery pack of claim 1, wherein, The position of the single battery arranged to be in contact with the glue is provided with a frosted structure.

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