Battery pack
Patent Information
- Application Number
- JP2024157957
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- Priority Date
- 2024-04-30
- Filing Date
- 2024-09-12
- Publication Date
- 2025-11-28
- Estimated Expiration
- 2044-09-12
AI Technical Summary
The existing design of battery packs requires a positioning structure for a resin plate, which complicates the assembly process and increases labor intensity.
A battery pack design that incorporates a casing with a receiving cavity, a reinforcing layer at the discharge end with channel holes, and a fixing adhesive that covers both, eliminating the need for a separate fixing structure and allowing the adhesive to uniformly fill the gaps between the reinforcing layer and the battery pack.
This design simplifies assembly, reduces costs, and enhances the fixing effect, providing more stable performance by ensuring the reinforcing layer and battery pack are fixed in all directions with the adhesive, while improving rigidity and insulation.
Smart Images
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Abstract
Description
[Technical Field]
[0001] This application claims priority from a Chinese patent application filed with the China Patent Office on April 30, 2024, bearing application number 2024209503804, the entire contents of which are incorporated herein by reference.
[0002] TECHNICAL FIELD This application relates to the field of batteries, and more particularly to battery packs. [Background technology]
[0003] In related art, the discharge terminal of a cell power battery pack is generally designed to be covered with a resin plate, which serves to provide insulation, flame retardancy, and improved rigidity. Summary of the Invention [Problem to be solved by the invention]
[0004] In the related art, a positioning structure needs to be designed to assemble the resin plate and the battery pack, which increases the difficulty of designing the battery pack and also makes the assembly process time-consuming and labor-intensive. [Means for solving the problem]
[0005] The present application relates to a battery pack, a casing having an opening for the receiving cavity; a battery pack provided in the housing cavity; a reinforcing layer provided at a discharge end of the battery pack and having a channel hole; The battery pack includes a reinforcing layer and a fixing adhesive that is filled in the receiving cavity and covers the battery pack. [Effects of the Invention]
[0006] The beneficial effects of the battery pack according to the present invention are as follows: The reinforcing layer and the battery pack are fixed together via the fixing adhesive, eliminating the need for a fixing structure for the reinforcing layer, which not only reduces the difficulty of battery pack design, simplifies the battery pack assembly process, improves production efficiency, and reduces costs, but also fixes the reinforcing layer and the battery pack in all directions via the fixing adhesive, improving the fixing effect of the reinforcing layer and the battery pack; and the provision of channel holes in the reinforcing layer allows the fixing adhesive to enter the slits between the reinforcing layer and the battery pack through the channel holes in the reinforcing layer, thereby more fully and uniformly filling the fixing adhesive and more stabilizing the performance of the battery pack. [Brief explanation of the drawings]
[0007] [Figure 1] 1 is a schematic cross-sectional view of a first cross section of a battery pack according to an embodiment of the present application; [Figure 2] 2 is a schematic cross-sectional view of a battery pack according to an embodiment of the present invention, taken along a second cross section perpendicular to the first cross section. FIG. [Figure 3] FIG. 2 is a schematic plan view of the structure of the reinforcing layer in FIG. 1. [Figure 4] 3 is a schematic diagram showing the process of injecting a fixing adhesive into the casing in FIG. 2.
[0023] FIG. [Figure 5] FIG. 2 is a cross-sectional schematic view of a battery pack according to another embodiment of the present application. [Figure 6] 1 is a flowchart of a method for manufacturing a battery pack according to the present application. DETAILED DESCRIPTION OF THE INVENTION
[0008] 1 and 2, Fig. 1 is a schematic cross-sectional view of a battery pack 100 according to an embodiment of the present application taken along a first cross section, and Fig. 2 is a schematic cross-sectional view of a battery pack 100 according to an embodiment of the present application taken along a second cross section perpendicular to the first cross section. 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 receiving cavity 12, the battery pack 20 is disposed in the receiving cavity 12, the reinforcing layer 30 is disposed at the discharge end of the battery pack 20, a channel hole 32 is formed in the reinforcing layer 30, and the fixing adhesive 40 is filled in the receiving cavity 12 and covers the reinforcing layer 30 and the battery pack 20.
[0009] Specifically, the casing 10 is hollow and has a receiving cavity 12 with at least one opening. The battery pack 20 may be placed directly in the receiving cavity 12 or may be fixed to the receiving cavity 12 via a fixing structure. The battery pack 20 includes a plurality of cells arranged in an array, which may 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 discharge electricity. A reinforcing layer 30 is provided at the discharge end of the battery pack 20 to improve the rigidity of the battery pack 20 and also to serve as an insulator and flame retardant. A fixing adhesive 40 is filled into the receiving cavity 12 and covers the reinforcing layer 30 and the battery pack 20. In the present embodiment, the reinforcing layer 30 and the battery pack 20 are fixed together via the fixing adhesive 40, eliminating the need for a fixing structure for the reinforcing layer 30. This not only reduces the difficulty of designing the battery pack 100, simplifies the assembly process of the battery pack 100, improves production efficiency, and reduces costs, but also secures the reinforcing layer 30 and the battery pack 20 in all directions via the fixing adhesive 40, improving the fixing effect between the reinforcing layer 30 and the battery pack 20. In one embodiment, the reinforcing layer 30 has channel holes 32, which allow the fixing adhesive 40 to enter the slits between the reinforcing layer 30 and the battery pack 20 through the channel holes 32, thereby more fully and uniformly filling the slits. This results in more stable performance of the battery pack 100.
[0010] Referring to FIG. 2, in this embodiment, the casing 10 includes a housing 14 and an upper cover 50, the upper cover 50 is connected to the housing 14 to form the accommodating cavity 12, and the reinforcing layer 30 is provided between the battery pack 20 and the upper cover 50.
[0011] Specifically, an opening for the accommodating cavity 12 is formed above the housing 14, and the upper cover 50 is provided to cover the opening of the accommodating cavity 12 so as to seal the accommodating cavity 12. By providing the casing 10 to the divided housing 14 and upper cover 50, it becomes easier to inject the fixing adhesive 40 into the accommodating cavity 12, which makes the filling of the fixing adhesive 40 more uniform and also makes it easier to assemble the battery pack 20 and the reinforcing layer 30.
[0012] In one embodiment, since a resin plate needs to be processed and molded, the production cost of the reinforcing layer 30 is high when a resin plate is used as the reinforcing layer 30. Therefore, the reinforcing layer 30 in this embodiment may be made of at least one of glass fiber cloth, carbon fiber cloth, and aramid cloth. Using a material such as glass fiber cloth instead of a resin plate can effectively reduce costs.
[0013] Specifically, in this embodiment, glass fiber cloth may be selected as the reinforcing layer 30. During assembly, the glass fiber cloth may be laminated on the discharge end of the battery pack 20, and an adhesive may be injected into the receiving cavity 12 of the casing 10. When the adhesive solidifies, a fixing adhesive 40 may be formed to cover the reinforcing layer 30 and the battery pack 20. The glass fiber cloth coated with the fixing adhesive 40 has high strength and may therefore improve the rigidity of the battery pack 100.
[0014] In some other embodiments, any two of the glass fiber cloth, carbon fiber cloth, and aramid cloth may be used together as the reinforcing layer 30 to meet different performance needs, or the glass fiber cloth, carbon fiber cloth, and aramid cloth may be used together as the reinforcing layer 30.
[0015] Since the cell packaging process in the related art typically uses foam to pot the battery pack 100, the embodiment of the present application can selectively use foam to make the fixing adhesive 40, thus utilizing the foam potting process in the related art, thereby simplifying the structural design and assembly process of the battery pack 100.
[0016] In one embodiment, as shown in Figures 1, 3 and 4, Figure 3 is a schematic diagram of the planar structure of the reinforcing layer 30 in Figure 1, and Figure 4 is a schematic diagram 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 portions 31 and a plurality of vertical portions 33, the plurality of horizontal portions 31 and the plurality of vertical portions 33 being arranged to intersect with each other, and two of the horizontal portions 31 and two of the vertical portions 33 being surrounded to form channel holes 32 shown in the black areas 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 receiving cavity 12 through the opening of the receiving cavity 12, the fixing adhesive 40 enters the side of the glass fiber cloth facing the battery pack 20 through the penetration channel, thereby achieving the effect of impregnating the glass fiber cloth. The fixing adhesive 40 that has entered the side of the glass fiber cloth facing the battery pack 20 can completely envelop 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 skeleton, and the fixing adhesive 40 can stably fix the glass fiber cloth to the battery pack 20.
[0017] In one embodiment, the horizontal portion 31 and the vertical portion 33 may be arranged perpendicular to each other, as shown in Figure 3. By adopting a 0° and 90° weaving process, when the glass fiber cloth is subjected to a force 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 arranged 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°, or 75°, etc., and specifically may be set flexibly 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 portions 31 and the vertical portions 33 are arranged perpendicular to each other, the width of the channel hole 32 specifically refers to 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 refers to the smaller length. Setting the width of the channel hole 32 to 1 millimeter or more not only ensures the rigidity of the reinforcing layer 30 but also ensures the fluidity of the fixing adhesive 40 within the channel hole 32, making it easier for the fixing adhesive 40 to enter the side of the reinforcing layer 30 facing the battery pack 20.
[0020] In a specific implementation, the width of the channel hole 32 may be set to, for example, 1 mm, 1.2 mm, 1.4 mm, 1.6 mm, 1.8 mm, 2 mm, 2.5 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, or 10 mm, and is not listed here one by one.
[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 on which the reinforcing layer 30 is located. The thickness of the reinforcing layer 30 is greater than or equal to 1 millimeter and less than or equal to 2 millimeters, so that the reinforcing layer 30 can have a large thickness. In this way, the reinforcing layer 30 not only has high strength after being wrapped in the fixing adhesive 40, but also can fill the gap between the upper cover 50 of the casing 10 and the battery pack 20.
[0022] In specific implementations, the thickness of the reinforcing layer 30 may be set to, for example, 1 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, 1.9 mm, or 2 mm, etc., and is not listed here one by one.
[0023] In one embodiment, to meet the design needs of different products, such as different rigidities of different battery packs 100 and different gaps between the top cover 50 and the battery assembly 20 of different battery packs 100, the number of reinforcing layers 30 may be set to two or three, and two or three reinforcing layers 30 are stacked at the discharge end of the battery assembly 20, with the channel holes 32 in the reinforcing layers 30 communicating with each other. In this way, stacking different numbers of reinforcing layers 30 allows the reinforcing layers 30 to have different rigidities and rationally fill the gap between the top cover 50 and the battery assembly 20, simplifying the design complexity of the battery pack 100 and improving assembly efficiency.
[0024] As shown in FIG. 2, in this embodiment, the battery pack 100 has two reinforcing layers 30, which are stacked on top of each other, and the channel holes 32 provided in the two reinforcing layers 30 are aligned with each other so as to be in communication with each other, allowing the fixing adhesive 40 to easily flow through the channel holes 32.
[0025] On the other hand, in the present application, by setting the thickness of the reinforcing layer 30 to be equal to or greater than 1 millimeter and equal to or less than 2 millimeters, the reinforcing layer 30 can have a large thickness, thereby reducing the number of reinforcing layers 30 stacked and preventing interlayer separation between adjacent reinforcing layers 30.
[0026] The applicant of the present application has conducted performance tests on the composite material of glass fiber cloth and expanded foam in this example, and on the simple expanded foam. See Table 1 for test details.
[0027] Table 1 ***t1
[0028] As can be seen from Table 1, after the glass fiber cloth and the expanded foam were combined, their tensile and flexural properties were both significantly improved, which in turn significantly improved the overall mechanical properties of the reinforcing layer.
[0029] Typically, friction between the reinforcing layers 30 can reduce the occurrence of interlayer separation between adjacent reinforcing layers 30, allowing multiple reinforcing layers 30 to be directly stacked on top of each other, thereby reducing the design complexity of the reinforcing layers 30 and simplifying the assembly process of the battery pack 100. In some other embodiments, to prevent the occurrence of interlayer separation between adjacent reinforcing layers 30, as shown in FIG. 5 , which is a cross-sectional schematic diagram of a battery pack 100 according to another embodiment of the present disclosure, the battery pack 100 may further include a connector 60 connecting two or three reinforcing layers 30. The connector 60 can fix the multiple reinforcing layers 30 to form an integrated structure, preventing the adjacent reinforcing layers 30 from moving relative to each other and causing interlayer separation, thereby improving the structural stability of the multiple reinforcing layers 30.
[0030] 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 a double-sided tape interposed between adjacent reinforcing layers 30 to adhesively connect the adjacent reinforcing layers 30. Alternatively, the connecting material 60 may adopt any other commonly used connecting structure, which is not specifically limited herein.
[0031] Continuing to refer to Figures 1 to 5, and also referring to Figure 6, Figure 6 is a flowchart of a method for manufacturing the battery pack 100 according to the present application. The method for manufacturing the battery pack 100 includes the following steps.
[0032] Step S10: The battery pack 20 is placed in the receiving cavity 12 of the casing 10.
[0033] Specifically, first, a plurality of cells are electrically connected in series, parallel, or series-parallel to form a battery pack 20, and then the battery pack 20 is placed in the receiving cavity 12 of the casing 10 through the opening of the receiving cavity 12, with the discharge end of the battery pack 20 facing the opening.
[0034] Step S20: The reinforcing layer 30 is placed on the discharge end of the battery pack 20.
[0035] After the battery pack 20 is placed in the receiving cavity 12, the reinforcing layer 30 is laid flat directly on the discharge end of the battery pack 20. If multiple reinforcing layers 30 are required, the multiple reinforcing layers 30 may be stacked in order, and the channel holes 32 in the multiple reinforcing layers 30 may be aligned with each other. If the multiple reinforcing layers 30 are required to be connected 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 end of the battery pack 20.
[0036] Step S30: The fixing adhesive 40 is injected into the receiving 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, the fixing adhesive 40 is injected into the accommodating cavity 12 through the opening of the accommodating cavity 12, and part of the fixing adhesive 40 enters the accommodating cavity 12 through the gap between the casing 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 channel holes 32 as shown in Figure 4, thereby completely enveloping the battery pack 20 and the reinforcing layer 30.
[0038] As described above, in the embodiments of the present application, the reinforcing layer 30 and the battery pack 20 are fixed together using the fixing adhesive 40, eliminating the need for the fixing structure of the reinforcing layer 30. This not only reduces the difficulty of designing the battery pack 100, simplifies the assembly process of the battery pack 100, improves production efficiency, and reduces costs, but also fixes the reinforcing layer 30 and the battery pack 20 in all directions using the fixing adhesive 40, improving the fixing effect of the reinforcing layer 30 and the battery pack 20. In addition, the reinforcing layer 30 has channel holes 32, which allow the fixing adhesive 40 to enter the slits between the reinforcing layer 30 and the battery pack 20 through the channel holes 32 of the reinforcing layer 30, thereby more fully and uniformly filling the fixing adhesive 40 and making the performance of the battery pack 100 more stable. [Explanation of symbols]
[0039] 100, battery pack, 10. Casing 12. Housing cavity 14. Housing 20. Battery pack 30. Reinforcement layer 31. Horizontal 32, channel hole 33. Vertical section 40. Fixing adhesive 50, upper cover 60, connecting material.
Claims
1. A battery pack, a casing having an opening for the receiving cavity; a battery pack provided in the accommodating cavity; a reinforcing layer provided at a discharge end of the battery pack and having a channel hole; a fixing adhesive filled in the accommodating cavity and covering the reinforcing layer and the assembled battery.
2. The battery pack of claim 1 , wherein the reinforcing layer includes at least one of a glass fiber cloth, a carbon fiber cloth, and an aramid cloth.
3. 2. The battery pack according to claim 1, wherein the reinforcing layer includes a plurality of horizontal portions and a plurality of vertical portions, the plurality of horizontal portions and the plurality of vertical portions being arranged to intersect with each other, and two of the horizontal portions and two of the vertical portions being surrounded to form the channel hole.
4. The battery pack according to claim 3 , wherein the horizontal portion and the vertical portion are perpendicular to each other.
5. 4. The battery pack according to claim 3, wherein the width of the channel hole is L millimeters, where L≧1.
6. 2. The battery pack according to claim 1, wherein the reinforcing layer has a thickness of T millimeters, where 1≦T≦2.
7. 7. The battery pack according to claim 6, wherein the number of the reinforcing layers is two or three, the two or three reinforcing layers are stacked at the discharge end of the battery pack, and the channel holes in the multiple reinforcing layers are in communication with each other.
8. The battery pack according to claim 7 , further comprising a connecting material 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 expanded foam.
10. 9. The battery pack according to claim 1, wherein the casing includes a housing and an upper cover, the upper cover is connected to the housing to form the accommodating cavity, and the reinforcing layer is provided between the battery pack and the upper cover.