Battery pack

Abstract

A battery pack (100), comprising a casing (10), a battery module (20), reinforcing layers (30), and a fixing adhesive (40). The casing (10) is provided with an accommodating cavity (12). The battery module (20) is provided in the accommodating cavity (12). The reinforcing layers (30) are provided at a discharging end of the battery module (20), and channel holes (32) are provided on the reinforcing layers (30). The fixing adhesive (40) is filled into the accommodating cavity (12) and encapsulates the reinforcing layers (30) and the battery module (20). According to the structure of the above-described battery pack (100), production and manufacturing efficiency can be improved, costs can be reduced, and the fixing effect of the reinforcing layers (30) and the battery module (20) can further be improved.

Description

Battery pack

[0001] The present application claims priority to the Chinese patent application No. 2024209503804, filed on April 30, 2024, to the Chinese Patent Office, the whole content of the above application being incorporated herein by reference. TECHNICAL FIELD

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

[0003] In the related art, the discharge end of the battery pack is generally covered by a resin plate to achieve insulation, flame retardation and rigidity improvement. TECHNICAL PROBLEM

[0004] In the related art, the assembly of the resin plate and the battery pack requires a positioning structure, which increases the design difficulty of the battery pack and consumes time and effort in the assembly process. TECHNICAL SOLUTION

[0005] The present application provides a battery pack, comprising:

[0006] a housing having a receiving cavity;

[0007] a battery pack arranged in the receiving cavity;

[0008] a reinforcing layer arranged at the discharge end of the battery pack, the reinforcing layer being provided with a through hole; and

[0009] a fixing glue filled in the receiving cavity, the fixing glue covering the reinforcing layer and the battery pack. ADVANTAGEOUS EFFECTS

[0010] The battery pack provided by the present application has the following advantageous effects: the fixing glue is used to fix the reinforcing layer and the battery pack, which not only eliminates the need for a fixing structure of the reinforcing layer, reduces the design difficulty of the battery pack, simplifies the assembly process of the battery pack, improves the production and manufacturing efficiency, and reduces the cost, but also improves the fixing effect of the reinforcing layer and the battery pack by fixing them in all directions; and the through hole is arranged on the reinforcing layer, so that the fixing glue can enter the gap between the reinforcing layer and the battery pack through the through hole, thereby making the filling of the fixing glue more sufficient and uniform, and making the performance of the battery pack more stable. BRIEF DESCRIPTION OF DRAWINGS

[0011] Fig. 1 is a schematic view of the cross-sectional structure of the battery pack in a first cross-section according to an embodiment of the present application;

[0012] Fig. 2 is a schematic view of the cross-sectional structure of the battery pack in a second cross-section perpendicular to the first cross-section according to an embodiment of the present application;

[0013] Fig. 3 is a schematic diagram of a planar structure of the reinforcing layer in Fig. 1;

[0014] Fig. 4 is a schematic diagram of a process of pouring the fixing glue into the shell in Fig. 2;

[0015] Fig. 5 is a schematic diagram of a cross section of a battery pack according to another embodiment of the present application;

[0016] Fig. 6 is a flow chart of a manufacturing method of a battery pack according to the present application.

[0017] BRIEF DESCRIPTION OF THE DRAWINGS 100, battery pack; 10, shell; 12, accommodating cavity; 14, shell body; 20, battery group; 30, reinforcing layer; 31, horizontal part; 32, passage hole; 33, vertical part; 40, fixing glue; 50, upper cover; 60, connecting piece. EMBODIMENTS OF THE PRESENT INVENTION

[0018] Please refer to Fig. 1 and Fig. 2, Fig. 1 is a schematic diagram of a cross section of a battery pack 100 according to an embodiment of the present application, and Fig. 2 is a schematic diagram of a cross section of the battery pack 100 according to an embodiment of the present application, which is perpendicular to the first cross section. The present application provides a battery pack 100, which comprises a shell 10, a battery group 20, a reinforcing layer 30 and a fixing glue 40. The shell 10 is provided with an accommodating cavity 12; the battery group 20 is arranged in the accommodating cavity 12; the reinforcing layer 30 is arranged at a discharging end of the battery group 20, and the reinforcing layer 30 is provided with a passage hole 32; and the fixing glue 40 is filled in the accommodating cavity 12, and the fixing glue 40 covers the reinforcing layer 30 and the battery group 20.

[0019] Specifically, the inside of the shell 10 is hollowed to form a receiving cavity 12 with at least one opening, and the battery pack 20 can be directly placed in the receiving cavity 12 or fixedly arranged in the receiving cavity 12 by a fixing structure. The battery pack 20 includes a plurality of array-arranged battery cells which can be connected together in series or in parallel or in series-parallel. The battery cells can be lithium batteries, sodium batteries, lead-acid batteries, etc. The battery cells are used to store and release electric quantity. The reinforcing layer 30 is arranged at the discharge end of the battery pack 20, which can improve the rigidity of the battery pack 20 and also play the role of insulation and flame retardation. The fixing glue 40 is filled in the receiving cavity 12 to wrap the reinforcing layer 30 and the battery pack 20. In the embodiment, the reinforcing layer 30 and the battery pack 20 are fixed by the fixing glue 40, which can not only save the fixing structure of the reinforcing layer 30, reduce the design difficulty of the battery pack 100, and simplify the assembly process of the battery pack 100, but also improve the fixing effect of the reinforcing layer 30 and the battery pack 20. In one embodiment, the channel hole 32 is arranged on the reinforcing layer 30, and the fixing glue 40 can enter the gap between the reinforcing layer 30 and the battery pack 20 from the channel hole 32 of the reinforcing layer 30, so that the fixing glue 40 can be filled more fully and uniformly, and the performance of the battery pack 100 is more stable.

[0020] Referring to FIG. 2, in the embodiment, the shell 10 includes a shell body 14 and an upper cover 50. The upper cover 50 is connected to the shell body 14 to form the receiving cavity 12, and the reinforcing layer 30 is arranged between the battery pack 20 and the upper cover 50.

[0021] Specifically, the upper part of the shell body 14 is formed with an opening of the receiving cavity 12, and the upper cover 50 is arranged on the opening of the receiving cavity 12 to seal the receiving cavity 12. By arranging the shell 10 as the split shell body 14 and the upper cover 50, the fixing glue 40 can be filled more uniformly, and the assembly of the battery pack 20 and the reinforcing layer 30 is facilitated.

[0022] In one embodiment, since the resin plate needs to be processed and formed, the production cost of the reinforcing layer 30 is relatively high when the resin plate is used as the reinforcing layer 30. Therefore, the reinforcing layer 30 in the embodiment can use at least one of glass fiber cloth, carbon fiber cloth, and aramid cloth. Using glass fiber cloth and the like instead of the resin plate can effectively reduce the cost.

[0023] Specifically, in this embodiment, the glass fiber cloth can be selected as the reinforcing layer 30. During assembly, the glass fiber cloth can be stacked at the discharge end of the battery pack 20, and the housing 10 is filled with the adhesive. After the adhesive solidifies, the adhesive 40 covering the reinforcing layer 30 and the battery pack 20 is formed. Since the glass fiber cloth covered by the adhesive 40 has high strength, it can be used to improve the rigidity of the battery pack 100.

[0024] In other embodiments, any two of the glass fiber cloth, the carbon fiber cloth, and the aramid cloth can be used as the reinforcing layer 30 at the same time, or all of the glass fiber cloth, the carbon fiber cloth, and the aramid cloth can be used as the reinforcing layer 30 at the same time to meet different performance requirements.

[0025] In the related art, the battery pack 100 is usually filled and sealed by using foaming glue. Therefore, in this embodiment, the material of the adhesive 40 can be made of foaming glue. In this way, the foaming glue filling and sealing process in the related art can be used to simplify the structure design and assembly process of the battery pack 100.

[0026] In one embodiment, as shown in FIGS. 1, 3, and 4, FIG. 3 is a plan view of the reinforcing layer 30 in FIG. 1, and FIG. 4 is a process diagram of filling the adhesive 40 into the housing 10 in FIG. 2. The reinforcing layer 30 includes a plurality of horizontal parts 31 and a plurality of vertical parts 33. The plurality of horizontal parts 31 and the plurality of vertical parts 33 are arranged to intersect each other, and two horizontal parts 31 and two vertical parts 33 are arranged to form a channel hole 32 shown by the black area in FIG. 3. The design of the channel hole 32 can provide a permeation channel for the adhesive 40. When the adhesive 40 is filled into the receiving cavity 12 through the opening of the receiving cavity 12, the adhesive 40 can enter the side of the glass fiber cloth facing the battery pack 20 through the permeation channel, so as to achieve the effect of infiltrating the glass fiber cloth. After the adhesive 40 entering the side of the glass fiber cloth facing the battery pack 20 is filled, the glass fiber cloth can be completely wrapped. At this time, the glass fiber cloth can improve the rigidity of the battery pack 100 as a skeleton, and the adhesive 40 can stably fix the glass fiber cloth on the battery pack 20.

[0027] In one embodiment, as shown in FIG. 3, the horizontal part 31 and the vertical part 33 can be arranged to be perpendicular to each other. By using a 0° and 90° direction weaving process, when the glass fiber cloth is subjected to a force perpendicular to the plane of the glass fiber cloth, the force can be evenly dispersed in two directions perpendicular to each other, so as to avoid stress concentration.

[0028] Alternatively, in other embodiments, the horizontal part 31 and the vertical part 33 can be arranged at a certain angle, for example, the angle between the horizontal part 31 and the vertical part 33 can be set to 30°, 45°, 60°, or 75°, etc. The specific angle can be flexibly set according to requirements, and the embodiment of the present application is not limited in this regard.

[0029] In one embodiment, as shown in FIG. 3, the width of the passage hole 32 can be set as L millimeters, L≥1. Specifically, as shown in FIG. 3, when the horizontal part 31 and the vertical part 33 are arranged perpendicular to each other, the width of the passage hole 32 specifically refers to the gap length between two adjacent horizontal parts 31 or the gap length between two adjacent vertical parts 33. When the gap length between two adjacent horizontal parts 31 and the gap length between two adjacent vertical parts 33 are not equal, the width of the passage hole 32 specifically refers to the smaller one. By setting the width of the passage hole 32 to be greater than or equal to 1 millimeter, not only the rigidity of the reinforcing layer 30 can be ensured, but also the flowability of the fixing glue 40 in the passage hole 32 can be ensured, so that the fixing glue 40 can enter the reinforcing layer 30 towards the side of the battery pack 20.

[0030] In specific implementation, the width of the passage hole 32 can be set as 1 millimeter, 1.2 millimeters, 1.4 millimeters, 1.6 millimeters, 1.8 millimeters, 2 millimeters, 2.5 millimeters, 3 millimeters, 4 millimeters, 5 millimeters, 6 millimeters, 7 millimeters, 8 millimeters, 9 millimeters, or 10 millimeters, and the like, which are not listed one by one here.

[0031] In one embodiment, the thickness of the reinforcing layer 30 can be set as T millimeters, 1≤T≤2. Specifically, as shown in FIG. 2, the thickness of the reinforcing layer 30 specifically refers to the height of the reinforcing layer 30 in the direction perpendicular to the plane where the reinforcing layer 30 is located. Since the thickness of the reinforcing layer 30 is greater than or equal to 1 millimeter and less than or equal to 2 millimeters, the reinforcing layer 30 can have a relatively thick thickness, so that not only the reinforcing layer 30 can have a relatively high strength after being wrapped by the fixing glue 40, but also the gap between the upper cover 50 of the shell 10 and the battery pack 20 can be filled.

[0032] In specific implementation, the thickness of the reinforcing layer 30 can be set as 1 millimeter, 1.1 millimeters, 1.2 millimeters, 1.3 millimeters, 1.4 millimeters, 1.5 millimeters, 1.6 millimeters, 1.7 millimeters, 1.8 millimeters, 1.9 millimeters, or 2 millimeters, and the like, which are not listed one by one here.

[0033] In one embodiment, in order to meet the design requirements of different products, for example, in order to meet the requirements of different battery packs 100 having different rigidity requirements and the gap between the upper cover 50 and the battery pack 20 of different battery packs 100 being different, the number of reinforcing layers 30 can be set as two or three, and the two or three reinforcing layers 30 are stacked and arranged at the discharging end of the battery pack 20, and the passage holes 32 on the reinforcing layers 30 are communicated with each other. In this way, by stacking different numbers of reinforcing layers 30, the reinforcing layers 30 can have different rigidity, and the gap between the upper cover 50 and the battery pack 20 can be reasonably filled, the design difficulty of the battery pack 100 is simplified, and the assembly efficiency is improved.

[0034] As shown in FIG. 2, in the embodiment, the battery pack 100 has two reinforcing layers 30, the two reinforcing layers 30 are arranged in a stack, and the through holes 32 arranged on the two reinforcing layers 30 are aligned with each other so that the through holes 32 on the two reinforcing layers 30 are communicated with each other, to facilitate the fixing glue 40 to flow in the through holes 32.

[0035] In another aspect, by setting the thickness of the reinforcing layer 30 to be greater than or equal to 1 millimeter and less than or equal to 2 millimeters, the reinforcing layer 30 can have a relatively thick thickness, thereby reducing the number of reinforcing layers 30 arranged in a stack and avoiding interlayer separation between adjacent reinforcing layers 30.

[0036] The applicant of the present application tests the performance of the material after the glass fiber cloth and the foamed glue are compounded in the embodiment and the pure foamed glue. For details, please refer to Table 1.

[0037] Table 1

[0038]

[0039] As can be seen from Table 1, after the glass fiber cloth and the foamed glue are compounded, the tensile properties and the bending properties are greatly improved, thereby greatly improving the overall mechanical properties of the reinforcing layer.

[0040] Generally, the friction between the reinforcing layers 30 can reduce the phenomenon of interlayer separation between adjacent reinforcing layers 30, so that a plurality of reinforcing layers 30 can be arranged in a stack, thereby reducing the design difficulty of the reinforcing layer 30 and simplifying the assembly process of the battery pack 100. In other embodiments, in order to avoid the phenomenon of interlayer separation between adjacent reinforcing layers 30, as shown in FIG. 5, which is a sectional view of a battery pack 100 according to another embodiment of the present application. The battery pack 100 can further include a connecting piece 60 connecting two or three reinforcing layers 30. The connecting piece 60 can fix the plurality of reinforcing layers 30 into an integrated structure, thereby avoiding the interlayer separation between adjacent reinforcing layers 30 due to mutual movement, and improving the structural stability of the plurality of reinforcing layers 30.

[0041] The connecting piece 60 can be a screw inserted into the reinforcing layer 30 to connect adjacent reinforcing layers 30. Alternatively, the connecting piece 60 can be double-sided adhesive tape clamped between adjacent reinforcing layers 30 to adhesively connect the adjacent reinforcing layers 30. Alternatively, the connecting piece 60 can also adopt other commonly used connecting structures, which are not limited here.

[0042] Please continue to refer to FIGS. 1-5, and in combination with FIG. 6, which is a flowchart of a manufacturing method of the battery pack 100 according to the present application. The manufacturing method of the battery pack 100 includes:

[0043] Step S10: placing the battery pack 20 in the accommodating cavity 12 of the shell 10.

[0044] Specifically, first, a plurality of battery cells are electrically connected together in series or in parallel or in series-parallel to form the battery pack 20, and then the battery pack 20 is placed in the accommodating cavity 12 through the opening of the accommodating cavity 12 of the shell 10, wherein the discharge end of the battery pack 20 is placed towards the opening.

[0045] Step S20: placing the reinforcing layer 30 at the discharge end of the battery pack 20.

[0046] After the battery pack 20 is placed in the accommodating cavity 12, the reinforcing layer 30 is directly laid at the discharge end of the battery pack 20. If multiple reinforcing layers 30 are needed to be arranged, the multiple reinforcing layers 30 can be arranged in sequence and the through holes 32 on the multiple reinforcing layers 30 are aligned with each other. If the multiple reinforcing layers 30 need to be connected by the connecting piece 60, the multiple reinforcing layers 30 can be connected by the connecting piece 60 first and then placed at the discharge end of the battery pack 20.

[0047] Step S30: pouring the fixing glue 40 into the accommodating cavity 12 until the fixing glue 40 covers the reinforcing layer 30 and the battery pack 20.

[0048] After the reinforcing layer 30 is placed on the battery pack 20, the fixing glue 40 is poured into the accommodating cavity 12 through the opening of the accommodating cavity 12. Part of the fixing glue 40 enters the accommodating cavity 12 through the gap between the shell 10 and the battery pack 20, and the other part enters the gap between the battery pack 20 and the reinforcing layer 30 through the through holes 32 as shown in FIG. 4, thereby completely wrapping the battery pack 20 and the reinforcing layer 30.

[0049] In summary, the fixing glue 40 is used to fix the reinforcing layer 30 and the battery pack 20 in the embodiments of the present application. Not only can the fixing structure of the reinforcing layer 30 be omitted, the design difficulty of the battery pack 100 is reduced, the assembly process of the battery pack 100 is simplified, the production and manufacturing efficiency is improved, and the cost is reduced, but also the fixing effect of the reinforcing layer 30 and the battery pack 20 is improved by the fixing glue 40 fixing the reinforcing layer 30 and the battery pack 20 in all directions. Furthermore, by arranging the through holes 32 on the reinforcing layer 30, the fixing glue 40 can enter the gap between the reinforcing layer 30 and the battery pack 20 through the through holes 32 of the reinforcing layer 30, so that the fixing glue 40 can be filled more fully and uniformly, and the performance of the battery pack 100 is more stable.

Claims

1. A battery pack, comprising: a housing having a receiving cavity; a battery pack arranged in the receiving cavity; a reinforcing layer arranged at a discharge end of the battery pack, the reinforcing layer having a through hole; and a fixing glue filled in the receiving cavity, the fixing glue covering the reinforcing layer and the battery pack.

2. The battery pack of claim 1, wherein, The reinforcing layer comprises at least one of glass fiber cloth, carbon fiber cloth and aramid cloth.

3. The battery pack of claim 1, wherein, The reinforcing layer comprises a plurality of horizontal parts and a plurality of vertical parts, the plurality of horizontal parts and the plurality of vertical parts are arranged to cross each other, and each two horizontal parts and each two vertical parts form the through hole.

4. The battery pack of claim 3, wherein, The horizontal parts and the vertical parts are perpendicular to each other.

5. The battery pack of claim 3, wherein, The width of the through hole is L millimeters, and L≥1.

6. The battery pack of claim 1, wherein, The thickness of the reinforcing layer is T millimeters, and 1≤T≤2.

7. The battery pack of claim 6, wherein, The number of the reinforcing layers is two or three, and the two or three reinforcing layers are arranged to stack at the discharge end of the battery pack, and the through holes on the plurality of reinforcing layers are connected to each other. 8.The battery pack of claim 7, further comprising a connecting piece connecting the two or three reinforcing layers.

9. The battery pack of any one of claims 1 to 8, wherein, The material of the fixing glue is foaming glue.

10. The battery pack of any one of claims 1 to 8, wherein, The housing comprises a shell and an upper cover, the upper cover is connected to the shell to form the receiving cavity, and the reinforcing layer is arranged between the battery pack and the upper cover.

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