Battery pack

Abstract

To provide a battery pack that improves the fixing effect of a reinforcing layer and a battery pack.SOLUTION: A battery pack according to the present invention includes a casing 10 with an accommodating cavity, a battery pack 20 installed in the accommodating cavity, a reinforcing layer 30 installed at the discharge end of the battery pack and having a channel hole, and a fixing adhesive 40 filled in the accommodating cavity and covering the reinforcing layer and the battery pack. This can improve production efficiency, reduce costs, and also improve the fixing effect of the reinforcing layer and the battery pack.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] This application claims the priority of a Chinese patent application with the application number 2024209503804 filed with the Chinese Patent Office on April 30, 2024, and all the contents of the above application are incorporated herein by reference.

[0002] This application relates to the technical field of batteries, specifically to battery packs.

Background Art

[0003] In related technologies, the discharge end of a cell power battery pack is generally designed to be coated with a resin plate, which serves to provide insulation, flame retardancy, and improved rigidity.

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the assembly of the resin plate and the battery pack in related technologies, it is necessary to design a positioning structure, which increases the design difficulty of the battery pack and also consumes time and labor in the assembly process.

Means for Solving the Problems

[0005] This application provides a battery pack, comprising a casing with an accommodating cavity formed therein, a battery pack provided in the accommodating cavity, a reinforcing layer provided at the discharge end of the battery pack and provided with channel holes, and a fixing adhesive filled in the accommodating cavity and covering the reinforcing layer and the battery pack.

Effects of the Invention

[0006] The beneficial effects of the battery pack according to this invention are as follows: The reinforcing layer and battery pack are fixed via a fixing adhesive, eliminating the need for a fixing structure for the reinforcing layer, thereby reducing the design difficulty of the battery pack, simplifying the assembly process, improving production efficiency, and reducing costs. Furthermore, the reinforcing layer and battery pack are fixed in all directions via the fixing adhesive, improving the fixing effect of the reinforcing layer and battery pack. Additionally, by providing channel holes in the reinforcing layer, the fixing adhesive can enter the slit between the reinforcing layer and the battery pack through the channel holes in the reinforcing layer, thereby filling the fixing adhesive more sufficiently and uniformly, and making the performance of the battery pack more stable. [Brief explanation of the drawing]

[0007] [Figure 1] This is a schematic diagram of the cross-sectional structure of a battery pack in a first cross-section according to one embodiment of the present invention. [Figure 2] This is a schematic diagram of the cross-sectional structure of a battery pack according to one embodiment of the present invention, in a second cross-section perpendicular to the first cross-section. [Figure 3] Figure 1 is a schematic diagram of the planar structure of the reinforcement layer. [Figure 4] Figure 2 is a schematic diagram of the process of injecting the fixing adhesive into the casing. [Figure 5] This is a schematic cross-sectional view of a battery pack according to another embodiment of the present application. [Figure 6] This is a flowchart of the method for manufacturing a battery pack according to the present invention. [Modes for carrying out the invention]

[0008] Referring to Figures 1 and 2, Figure 1 is a schematic diagram of the cross-sectional structure of a battery pack 100 in a first cross-section according to one embodiment of the present application, and Figure 2 is a schematic diagram of the cross-sectional structure of a battery pack 100 in a second cross-section perpendicular to the first cross-section according to one embodiment of the present application. The embodiment of the present application provides a battery pack 100 which includes a casing 10, a battery pack 20, a reinforcing layer 30, and a fixing adhesive 40. The casing 10 has a housing cavity 12, the battery pack 20 is provided in the housing cavity 12, the reinforcing layer 30 is provided at the discharge end of the battery pack 20, the reinforcing layer 30 has channel holes 32, and the fixing adhesive 40 is filled into the housing cavity 12 and covers the reinforcing layer 30 and the battery pack 20.

[0009] Specifically, the inside of the casing 10 is hollow and has a housing cavity 12 having at least one opening. The battery pack 20 may be placed directly in the housing cavity 12 or fixed to the housing cavity 12 via a fixing structure. The battery pack 20 includes a plurality of cells arranged in an array, which can be electrically connected in series, parallel, or series-parallel. The cells may be lithium batteries, sodium batteries, lead-acid batteries, etc., and are used to store and release electrical energy. The reinforcing layer 30 is provided at the discharge end of the battery pack 20 and can improve the rigidity of the battery pack 20, as well as providing insulation and flame retardancy. The fixing adhesive 40 is filled into the housing cavity 12 and covers the reinforcing layer 30 and the battery pack 20. In the embodiments of the present invention, the reinforcing layer 30 and the battery pack 20 are fixed via a fixing adhesive 40, eliminating the need for a fixing structure for the reinforcing layer 30. This reduces the design difficulty of the battery pack 100, simplifies the assembly process of the battery pack 100, improves production efficiency, and reduces costs. Furthermore, the fixing adhesive 40 fixes the reinforcing layer 30 and the battery pack 20 in all directions, improving the fixing effect of the reinforcing layer 30 and the battery pack 20. In one embodiment, by providing channel holes 32 in the reinforcing layer 30, the fixing adhesive 40 can enter the slit between the reinforcing layer 30 and the battery pack 20 through the channel holes 32 in the reinforcing layer 30, thereby allowing the fixing adhesive 40 to be filled more sufficiently and uniformly, and making the performance of the battery pack 100 more stable.

[0010] Referring to Figure 2, in this embodiment, the casing 10 includes a housing 14 and an upper cover 50, the upper cover 50 being connected to the housing 14 to form a housing cavity 12, and the reinforcing layer 30 being provided between the battery pack 20 and the upper cover 50.

[0011] Specifically, an opening for the housing cavity 12 is formed above the housing 14, and the upper cover 50 is provided to cover the opening of the housing cavity 12 so as to seal the housing cavity 12. By providing the casing 10 on the divided housing 14 and upper cover 50, it becomes easier to inject the fixing adhesive 40 into the housing cavity 12, the filling of the fixing adhesive 40 becomes more uniform, and the assembly of the battery pack 20 and reinforcing layer 30 becomes easier.

[0012] In one embodiment, since the resin plate needs to be processed and molded, the production cost of the reinforcing layer 30 is high when the resin plate is used as the reinforcing layer 30. Therefore, in this embodiment, the reinforcing layer 30 may be made of at least one of glass fiber cloth, carbon fiber cloth, and aramid cloth. By using a material such as glass fiber cloth instead of the resin plate, costs can be effectively reduced.

[0013] Specifically, in this embodiment, glass fiber cloth may be selected as the reinforcing layer 30. When assembling, the glass fiber cloth can be laminated onto the discharge terminals of the battery pack 20, and adhesive can be injected into the housing cavity 12 of the casing 10. Once the adhesive solidifies, a fixing adhesive 40 can be formed that covers the reinforcing layer 30 and the battery pack 20. The glass fiber cloth covered with the fixing adhesive 40 has high strength and can therefore be used to improve the rigidity of the battery pack 100.

[0014] In some other embodiments, to meet different performance needs, any two of the materials from glass fiber cloth, carbon fiber cloth, and aramid cloth may be used in combination as the reinforcing layer 30, or glass fiber cloth, carbon fiber cloth, and aramid cloth may be used in combination as the reinforcing layer 30.

[0015] In related technologies, the cell packaging process typically involves potting the battery pack 100 using foamed foam. Therefore, in the embodiment of this application, foamed foam can be selectively used to produce the fixing adhesive 40. Thus, the foamed foam potting process in related technologies can be utilized, and consequently, the structural design and assembly process of the battery pack 100 can be simplified.

[0016] In one embodiment, as shown in Figures 1, 3, and 4, Figure 3 is a schematic plan view of the reinforcing layer 30 in Figure 1, and Figure 4 is a schematic view of the process of injecting the fixing adhesive 40 into the casing 10 in Figure 2. The reinforcing layer 30 includes a plurality of horizontal sections 31 and a plurality of vertical sections 33, the plurality of horizontal sections 31 and the plurality of vertical sections 33 are arranged to intersect each other, and two sets of horizontal sections 31 and two sets of vertical sections 33 are surrounded to form channel holes 32 shown in the black area in Figure 3. The design of the channel holes 32 provides a penetration channel for the fixing adhesive 40. When the fixing adhesive 40 is injected into the housing cavity 12 through the opening of the housing cavity 12, the fixing adhesive 40 enters the side of the glass fiber cloth facing the battery pack 20 through the penetration channel, achieving the effect of impregnating the glass fiber cloth. The fixing adhesive 40 that enters the side of the glass fiber cloth facing the battery pack 20 can completely wrap the glass fiber cloth after filling. At this time, the rigidity of the battery pack 100 can be improved by using the glass fiber cloth as a framework, and the glass fiber cloth can be stably fixed to the battery pack 20 by the fixing adhesive 40.

[0017] In one embodiment, as shown in Figure 3, the horizontal portion 31 and the vertical portion 33 may be arranged perpendicular to each other. By employing a weaving process in the 0° and 90° directions, when the glass fiber cloth is subjected to a force acting perpendicular to the plane on which the glass fiber cloth is located, the force can be uniformly distributed in two directions perpendicular to each other, thereby avoiding stress concentration.

[0018] Alternatively, in other embodiments, the horizontal portion 31 and the vertical portion 33 may be provided at a certain angle. For example, the angle between the horizontal portion 31 and the vertical portion 33 may be set to 30°, 45°, 60°, 75°, etc., and specifically, it may be flexibly set according to needs and is not specifically limited in the embodiments of the present application.

[0019] In one embodiment, as shown in FIG. 3, the width of the channel hole 32 may be set to L millimeters, where L≥1. Specifically, as shown in FIG. 3, when the horizontal portion 31 and the vertical portion 33 are provided perpendicular to each other, the width of the channel hole 32 specifically means the length of the gap between two adjacent horizontal portions 31 or the length of the gap between two adjacent vertical portions 33. When the length of the gap between two adjacent horizontal portions 31 and the length of the gap between two adjacent vertical portions 33 are not the same, the width of the channel hole 32 specifically means the smaller one. By setting the width of the channel hole 32 to 1 millimeter or more, not only can the rigidity of the reinforcing layer 30 be ensured, but also the fluidity of the fixing adhesive 40 within the channel hole 32 can be ensured, making it easier for the fixing adhesive 40 to enter the side facing the assembled battery 20 of the reinforcing layer 30.

[0020] In a specific implementation, the width of the channel hole 32 may be set to, for example, 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, etc., and will not be listed one by one here.

[0021] In one embodiment, the thickness of the reinforcing layer 30 may be set to T millimeters, where 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 perpendicular to the plane where the reinforcing layer 30 is located. Since the thickness of the reinforcing layer 30 is 1 millimeter or more and 2 millimeters or less, the reinforcing layer 30 can have a large thickness. Thus, not only can the reinforcing layer 30 have high strength after being wrapped by the fixing adhesive 40, but it can also fill the gap between the upper cover 50 of the casing 10 and the assembled battery 20.

[0022] In a specific implementation, the thickness of the reinforcing layer 30 may be set to, for example, 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, etc., and will not be listed one by one here.

[0023] In one embodiment, in order to meet the design needs of different products, for example, to meet the needs of different battery packs 100 having different rigidities and different gaps between the upper cover 50 of different battery packs 100 and the assembled battery 20, the number of reinforcing layers 30 may be set to two or three. The two or three reinforcing layers 30 are stacked and provided at the discharge end of the assembled battery 20, and the channel holes 32 in the reinforcing layer 30 communicate with each other. Thus, by stacking different numbers of reinforcing layers 30, the reinforcing layer 30 can have different rigidities and can reasonably fill the gap between the upper cover 50 and the assembled battery 20, simplifying the design difficulty of the battery pack 100 and improving the assembly efficiency.

[0024] As shown in FIG. 2, in this embodiment, the battery pack 100 has two reinforcing layers 30. The two reinforcing layers 30 are stacked and provided, and the channel holes 32 provided in the two reinforcing layers 30 are aligned with each other so as to communicate with each other, making it easy for the fixing adhesive 40 to flow through the channel holes 32.

[0025] On the other hand, by setting the thickness of the reinforcing layer 30 to 1 millimeter or more and 2 millimeters or less, the reinforcing layer 30 can have a thicker thickness, thereby reducing the number of reinforcing layers 30 that are laminated together and avoiding interlayer separation between adjacent reinforcing layers 30.

[0026] The applicant of this application conducted performance tests on the composite material of glass fiber cloth and foam in this embodiment, and on a simple foam. Details of the tests are shown in Table 1.

[0027] Table 1 JPEG0007842825000001.jpg118170

[0028] As can be seen from Table 1, after the glass fiber cloth and foam were combined, both their tensile and flexural properties were significantly improved, and consequently, the overall mechanical performance of the reinforcement layer was greatly enhanced.

[0029] Normally, friction between reinforcing layers 30 can reduce the occurrence of interlayer separation between adjacent reinforcing layers 30, allowing multiple reinforcing layers 30 to be directly stacked, thereby reducing the design difficulty of the reinforcing layers 30 and simplifying the assembly process of the battery pack 100. In some other embodiments, to avoid the occurrence of interlayer separation between adjacent reinforcing layers 30, the arrangement is as shown in Figure 5, which is a schematic cross-sectional view of a battery pack 100 according to another embodiment of the present application. The battery pack 100 may further include connecting members 60 that connect two or three reinforcing layers 30. By installing the connecting members 60, multiple reinforcing layers 30 can be fixed to form an integrated structure, preventing movement between adjacent reinforcing layers 30 and the occurrence of interlayer separation, thereby improving the structural stability of the multiple reinforcing layers 30.

[0030] Among these, the connecting material 60 may be a screw inserted into the reinforcing layer 30 to connect adjacent reinforcing layers 30. Alternatively, the connecting material 60 may be double-sided tape interposed between adjacent reinforcing layers 30 to adhesively connect them. Alternatively, the connecting material 60 may employ other commonly used connecting structures, and is not specifically limited here.

[0031] Please continue referring to Figures 1 to 5, and also to Figure 6, which is a flowchart of the method for manufacturing the battery pack 100 according to the present invention. The method for manufacturing the battery pack 100 includes the following steps.

[0032] Step S10: Place the battery pack 20 into the housing cavity 12 of the casing 10.

[0033] Specifically, first, multiple cells are electrically connected in series, parallel, or series-parallel to form a battery pack 20. Then, the battery pack 20 is placed in the housing cavity 12 of the casing 10 through the opening of the housing cavity 12, with the discharge terminals of the battery pack 20 facing the opening.

[0034] Step S20: Place the reinforcing layer 30 on the discharge terminal of the battery pack 20.

[0035] After placing the battery pack 20 in the housing cavity 12, the reinforcing layer 30 is laid flat directly on the discharge terminal of the battery pack 20. If it is necessary to provide multiple reinforcing layers 30, the multiple reinforcing layers 30 may be stacked in sequence, and the channel holes 32 in the multiple reinforcing layers 30 may be aligned with each other. If it is necessary to connect multiple reinforcing layers 30 using a connecting material 60, the multiple reinforcing layers 30 may first be connected via the connecting material 60 and then placed on the discharge terminal of the battery pack 20.

[0036] Step S30: Inject the fixing adhesive 40 into the housing cavity 12 until the fixing adhesive 40 covers the reinforcing layer 30 and the battery pack 20.

[0037] After the reinforcing layer 30 is placed on the battery pack 20, fixing adhesive 40 is injected into the housing cavity 12 through the opening of the housing cavity 12. A portion of the fixing adhesive 40 enters the housing cavity 12 through the gap between the casing 10 and the battery pack 20, and the other portion enters the gap between the battery pack 20 and the reinforcing layer 30 through the channel holes 32 as shown in Figure 4, thereby completely enclosing the battery pack 20 and the reinforcing layer 30.

[0038] As described above, the embodiment of the present invention fixes the reinforcing layer 30 and the battery pack 20 via the fixing adhesive 40, eliminating the need for a fixing structure for the reinforcing layer 30. This reduces the design difficulty of the battery pack 100, simplifies the assembly process of the battery pack 100, improves production efficiency, and reduces costs. Furthermore, the fixing adhesive 40 fixes the reinforcing layer 30 and the battery pack 20 in all directions, improving the fixing effect of the reinforcing layer 30 and the battery pack 20. Additionally, by providing channel holes 32 in the reinforcing layer 30, the fixing adhesive 40 can enter the slit between the reinforcing layer 30 and the battery pack 20 through the channel holes 32 in the reinforcing layer 30, thereby filling the fixing adhesive 40 more sufficiently and uniformly, and making the performance of the battery pack 100 more stable. [Explanation of symbols]

[0039] 100, battery pack, 10. Casing 12. Containment Cavity 14. Housing 20. Battery pack 30. Reinforcement layer 31. Side view 32, channel holes 33. Vertical section 40. Fixing adhesive 50, Top cover 60. Connecting material.

Claims

1. It is a battery pack, A casing from which the containment cavity can be opened, A battery pack is provided in the aforementioned housing cavity, A reinforcing layer provided at the discharge end of the aforementioned battery pack, having channel holes, The housing cavity is filled with a fixing adhesive that covers the reinforcing layer and the battery pack, The composite material of the reinforcing layer and the fixing adhesive has a tensile strength of 48.4 MPa and a tensile strain of 21.9%. A battery pack characterized in that the tensile strength and tensile strain are measured according to GB-T528.

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

3. The battery pack according to claim 1, wherein the reinforcing layer includes a plurality of horizontal and a plurality of vertical portions, the plurality of horizontal and the plurality of vertical portions are arranged to intersect each other, and two sets of horizontal and two sets of vertical portions surround each other to form the channel holes.

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

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

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

7. The battery pack according to claim 6, wherein the number of reinforcing layers is two or three, the two or three reinforcing layers are stacked on the discharge end of the battery pack, and the channel holes in the plurality of reinforcing layers are in communication with each other.

8. The battery pack according to claim 7, further comprising a connecting member for connecting two or three of the reinforcing layers.

9. The battery pack according to any one of claims 1 to 8, wherein the material of the fixing adhesive is foam.

10. The battery pack according to any one of claims 1 to 8, wherein the casing includes a housing and an upper cover, the upper cover being connected to the housing to form the housing cavity, and the reinforcing layer being provided between the battery pack and the upper cover.

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