Battery pack

Abstract

The utility model discloses a battery pack which comprises a shell, a battery pack, a reinforcing layer and fixing glue, and the shell is provided with an accommodating cavity; the battery pack is arranged in the accommodating cavity; the reinforcing layer is arranged at the discharge end of the battery pack, and a channel hole is formed in the reinforcing layer; and the fixing glue is filled in the accommodating cavity and covers the reinforcing layer and the battery pack. The reinforcing layer and the battery pack are fixed through the fixing glue, so that a fixing structure of the reinforcing layer can be omitted, the design difficulty of the battery pack is reduced, the assembly process of the battery pack is simplified, the production and manufacturing efficiency is improved, and the cost is reduced; the reinforcing layer and the battery pack are fixed in all directions, so that the fixing effect of the reinforcing layer and the battery pack is improved, and the performance of the battery pack is more stable.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery pack. Background Art

[0002] Currently, the discharge end of the battery pack is generally covered with a resin plate to provide insulation, flame retardancy and increase rigidity. The assembly of the resin plate and the battery pack requires the design of a positioning structure, which increases the difficulty of the battery pack design and makes the assembly process time-consuming and labor-intensive. Utility Model Content

[0003] One purpose of the present utility model is to provide a battery pack, which aims to solve the technical problem of the difficulty in designing and assembling the battery pack.

[0004] In order to achieve the above object, the utility model provides a solution: a battery pack, the battery pack comprising:

[0005] The housing is provided with a receiving cavity;

[0006] A battery pack is disposed in the receiving cavity;

[0007] A reinforcement layer, disposed at the discharge end of the battery pack, wherein the reinforcement layer is provided with a channel hole; and

[0008] A fixing glue is filled in the receiving cavity, and the fixing glue covers the reinforcing layer and the battery pack.

[0009] Optionally, the reinforcement layer includes at least one of glass fiber cloth, carbon fiber cloth and aramid cloth.

[0010] Optionally, the reinforcement layer includes a plurality of transverse portions and a plurality of vertical portions, the plurality of transverse portions and the plurality of vertical portions are arranged crosswise with each other, and pairs of the transverse portions and pairs of the vertical portions are arranged to surround and form the channel hole.

[0011] Optionally, the horizontal portion and the vertical portion are perpendicular to each other.

[0012] Optionally, the width of the channel hole is L mm, where L≥1.

[0013] Optionally, the thickness of the reinforcement layer is T millimeters, 1≤T≤2.

[0014] Optionally, the number of the reinforcement layers is two or three, and the two or three reinforcement layers are stacked and arranged at the discharge end of the battery pack, and the channel holes on the plurality of reinforcement layers are interconnected.

[0015] Optionally, the battery pack further includes a connector, which connects two or three of the reinforcement layers.

[0016] Optionally, the material of the fixing glue is foam glue.

[0017] Optionally, the outer shell includes a shell and an upper cover, the upper cover is connected to the shell to form the receiving cavity, and the reinforcement layer is arranged between the battery pack and the upper cover.

[0018] The beneficial effect of the utility model is that the reinforcing layer and the battery pack are fixed by fixing glue, which not only saves the fixing structure of the reinforcing layer, reduces the design difficulty of the battery pack, simplifies the assembly process of the battery pack, improves production efficiency, and reduces costs, but also the fixing glue can be filled into the channel hole to fix the reinforcing layer and the battery pack in all directions, thereby improving the fixing effect of the reinforcing layer and the battery pack and making the performance of the battery pack more stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0020] Figure 1 is a schematic cross-sectional structural diagram of a battery pack provided by an embodiment of the utility model at a first cross section;

[0021] Figure 2 is a schematic cross-sectional structural diagram of a battery pack provided by an embodiment of the utility model at a second cross section perpendicular to the first cross section;

[0022] Figure 3 yes Figure 1 Schematic diagram of the plane structure of the reinforcement layer;

[0023] Figure 4 is to Figure 2 Schematic diagram of the process of pouring fixing glue into the shell;

[0024] Figure 5 is a cross-sectional schematic diagram of a battery pack in another embodiment of the utility model;

[0025] Figure 6 It is a flow chart of the method for manufacturing the battery pack in the utility model;

[0026] Explanation of the accompanying drawings: 100, battery pack; 10, outer shell; 12, receiving cavity; 14, shell; 20, battery pack; 30, reinforcement layer; 31, horizontal part; 32, channel hole; 33, vertical part; 40, fixing glue; 50, upper cover; 60, connecting piece. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0028] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0029] It should also be noted that when an element is referred to as being "fixed on" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element at the same time. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or may be indirectly connected to the other element through an intermediate element.

[0030] See also Figure 1 and Figure 2 , Figure 1 is a schematic cross-sectional structural diagram of a battery pack 100 provided in an embodiment of the utility model at a first cross section, Figure 2 1 is a schematic diagram of the cross-sectional structure of the battery pack 100 provided in an embodiment of the utility model at a second cross section perpendicular to the first cross section. The utility model embodiment provides a battery pack 100, which includes a housing 10, a battery pack 20, a reinforcing layer 30 and a fixing glue 40. The housing 10 is provided with a receiving cavity 12; the battery pack 20 is arranged in the receiving cavity 12; the reinforcing layer 30 is arranged at the discharge end of the battery pack 20, and a channel hole 32 is provided on the reinforcing layer 30; the fixing glue 40 is filled in the receiving cavity 12, and the fixing glue 40 covers the reinforcing layer 30 and the battery pack 20.

[0031] Specifically, the inner hollow of the housing 10 forms a receiving cavity 12 having at least one opening. The battery pack 20 can be directly placed in the receiving cavity 12, or fixed in the receiving cavity 12 by a fixed structure. The battery pack 20 includes a plurality of cells arranged in an array. The plurality of cells can be electrically connected in series or in parallel or in series and parallel. The cells can be lithium batteries, sodium batteries, lead-acid batteries, etc. The cells are used to store and release electricity. The reinforcement layer 30 is arranged at the discharge end of the battery pack 20. On the one hand, it can improve the rigidity of the battery pack 20, and on the other hand, it can also play an insulating and flame-retardant role. The fixing glue 40 is filled in the receiving cavity 12, covering the reinforcement layer 30 and the battery pack 20. The embodiment of the utility model fixes the reinforcing layer 30 and the battery pack 20 by the fixing glue 40, which not only eliminates the fixing structure of the reinforcing layer 30, reduces the design difficulty of the battery pack 100, simplifies the assembly process of the battery pack 100, improves the production efficiency, and reduces the cost, but also the fixing glue 40 can be filled into the channel hole 32 to fix the reinforcing layer 30 and the battery pack 20 in all directions, improves the fixing effect of the reinforcing layer 30 and the battery pack 20, and makes the performance of the battery pack 100 more stable.

[0032] See also Figure 2 In this embodiment, the housing 10 includes a shell 14 and an upper cover 50 , the upper cover 50 is connected to the shell 14 to form a receiving cavity 12 , and the reinforcement layer 30 is disposed between the battery pack 20 and the upper cover 50 .

[0033] Specifically, an opening of the receiving cavity 12 is formed above the shell 14, and the upper cover 50 is disposed on the opening of the receiving cavity 12 to seal the receiving cavity 12. By providing the housing 10 with the separate shell 14 and the upper cover 50, it is convenient to fill the fixing glue 40 into the receiving cavity 12, so that the fixing glue 40 is filled more evenly, and it is convenient to assemble the battery pack 20 and the reinforcing layer 30.

[0034] Furthermore, since the resin plate needs to be processed and formed, when the resin plate is used as the reinforcement layer 30, the production cost of the reinforcement layer 30 is relatively high, so the reinforcement layer 30 in this embodiment can be made of at least one of glass fiber cloth, carbon fiber cloth, and aramid cloth. Using glass fiber cloth and other materials instead of resin plates can effectively reduce costs.

[0035] Specifically, in this embodiment, glass fiber cloth can be selected as the reinforcement layer 30. During assembly, the glass fiber cloth can be stacked on the discharge end of the battery pack 20, and colloid can be filled into the receiving cavity 12 of the shell 10. After the colloid solidifies, a fixing glue 40 covering the reinforcement layer 30 and the battery pack 20 can be formed. Since the glass fiber cloth covered by the fixing glue 40 has a high strength, it can be used to improve the rigidity of the battery pack 100.

[0036] In some other embodiments, any two materials among glass fiber cloth, carbon fiber cloth, and aramid cloth can be used as the reinforcement layer 30 at the same time, or glass fiber cloth, carbon fiber cloth and aramid cloth can be used as the reinforcement layer 30 at the same time to meet different performance requirements.

[0037] The existing battery cell packaging process usually uses foam glue to seal the battery pack 100. Therefore, the embodiment of the utility model can use foam glue as the material of the fixing glue 40. In this way, the existing foam glue sealing process can be used to simplify the structural design and assembly process of the battery pack 100.

[0038] Furthermore, if Figure 1 , Figure 3 and Figure 4 As shown, Figure 3 yes Figure 1 A schematic diagram of the planar structure of the reinforcement layer 30, Figure 4 is to Figure 2 The reinforcing layer 30 includes a plurality of transverse portions 31 and a plurality of vertical portions 33, wherein the plurality of transverse portions 31 and the plurality of vertical portions 33 are arranged crosswise with each other, and the plurality of transverse portions 31 and the plurality of vertical portions 33 are arranged in pairs to form a Figure 3 The channel hole 32 is shown in the black area. The design of the channel hole 32 can provide a penetration channel for the fixing glue 40. After the fixing glue 40 is poured into the receiving cavity 12 through the opening of the receiving cavity 12, the fixing glue 40 can enter the glass fiber cloth through the penetration channel to achieve the effect of soaking the glass fiber cloth. After the fixing glue 40 enters the glass fiber cloth, the glass fiber cloth can be completely wrapped. At this time, the glass fiber cloth can be used as a skeleton to improve the rigidity of the battery pack 100, and the fixing glue 40 can stably fix the glass fiber cloth on the battery pack 20.

[0039] Furthermore, if Figure 3 As shown, the horizontal portion 31 and the vertical portion 33 can be arranged perpendicular to each other. By adopting the 0° and 90° direction weaving process, when the glass fiber cloth is subjected to a force perpendicular to the plane where the glass fiber cloth is located, the force can be evenly dispersed in two perpendicular directions to avoid stress concentration problems.

[0040] Alternatively, in other embodiments, the horizontal portion 31 and the vertical portion 33 may also 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. The specific angle may be flexibly set according to needs and is not specifically limited in the embodiments of the present application.

[0041] Furthermore, if Figure 3 As shown, the width of the channel hole 32 can be set to L mm, L ≥ 1. Specifically, as Figure 3As shown, when the horizontal portion 31 and the vertical portion 33 are arranged perpendicular to each other, the width of the channel hole 32 specifically refers to the gap length between two adjacent horizontal portions 31, or the gap length between two adjacent vertical portions 33. When the gap length between two adjacent horizontal portions 31 and the gap length between two adjacent vertical portions 33 are not equal, the width of the channel hole 32 specifically refers to the smaller one. By setting the width of the channel hole 32 to be greater than or equal to 1 mm, not only the rigidity of the reinforcing layer 30 can be ensured, but also the fluidity of the fixing glue 40 in the channel hole 32 can be ensured, so that the fixing glue 40 can enter the channel hole 32 easily.

[0042] In a specific embodiment, the width of the channel hole 32 can 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, etc., which are not listed here one by one.

[0043] Furthermore, the thickness of the reinforcement layer 30 may be set to T mm, 1≤T≤2. Figure 2 As shown, the thickness of the reinforcing layer 30 specifically refers to the height of the reinforcing layer 30 perpendicular to the plane on which it is located. Since the thickness of the reinforcing layer 30 is greater than or equal to 1 mm and less than or equal to 2 mm, the reinforcing layer 30 can have a relatively thick thickness, so that not only can the reinforcing layer 30 have a relatively high strength after being wrapped by the fixing glue 40, but also can fill the gap between the upper cover 50 of the housing 10 and the battery pack 20.

[0044] In a specific embodiment, the thickness of the reinforcement layer 30 can 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., which are not listed here one by one.

[0045] Furthermore, in order to meet the design requirements of different products, for example, in order to meet the different rigidity requirements of different battery packs 100 and the different gap requirements between the upper cover 50 and the battery pack 20 of different battery packs 100, the number of reinforcing layers 30 can be set to two or three, and two or three reinforcing layers 30 are stacked and arranged at the discharge end of the battery pack 20, and the channel holes 32 on the reinforcing layers 30 are interconnected. In this way, by stacking different numbers of reinforcing layers 30, the reinforcing layers 30 can have different rigidities, and can reasonably fill the gap between the upper cover and the battery pack 20, simplifying the design difficulty of the battery pack 100 and improving assembly efficiency.

[0046] like Figure 2As shown, in the embodiment of the utility model, the battery pack 100 has two reinforcement layers 30, the two reinforcement layers 30 are stacked on each other, and the channel holes 32 arranged on the two reinforcement layers 30 are aligned with each other so that the channel holes 32 on the two reinforcement layers 30 are connected to each other, so as to facilitate the fixing glue 40 to flow in the channel holes 32.

[0047] On the other hand, the present invention can make the reinforcing layer 30 have a thicker thickness by setting the thickness of the reinforcing layer 30 to be greater than or equal to 1 mm and less than or equal to 2 mm, thereby reducing the number of stacked reinforcing layers 30 and avoiding the problem of interlayer separation between adjacent reinforcing layers 30.

[0048] The inventor of the present application conducted performance tests on the composite material of the glass fiber cloth and foam glue in this embodiment and the simple foam glue. The test details are shown in Table 1.

[0049] Table 1

[0050]

[0051] It can be seen from Table 1 that the tensile properties and bending properties of the glass fiber cloth and the foamed rubber are greatly improved after being compounded, thereby greatly improving the overall mechanical properties of the reinforcement layer.

[0052] Generally, the friction between the reinforcement layers 30 can reduce the problem of interlayer separation between adjacent reinforcement layers 30, so multiple reinforcement layers 30 can be directly stacked, thereby reducing the design difficulty of the reinforcement layers 30 and simplifying the assembly process of the battery pack 100. In some other embodiments, in order to further avoid the problem of interlayer separation between adjacent reinforcement layers 30, such as Figure 5 As shown, Figure 5 1 is a schematic cross-sectional view of a battery pack 100 in another embodiment of the present invention. The battery pack 100 may further include a connector 60, which connects two or three reinforcement layers 30. The configuration of the connector 60 can fix the multiple reinforcement layers 30 to form an integrated structure, thereby preventing the adjacent reinforcement layers 30 from moving relative to each other and causing interlayer separation, thereby improving the structural stability of the multiple reinforcement layers 30.

[0053] The connecting member 60 may be a screw, which is inserted into the reinforcing layer 30 to connect adjacent reinforcing layers 30. Alternatively, the connecting member 60 may be a double-sided adhesive tape, which is sandwiched between adjacent reinforcing layers 30 to bond and connect adjacent reinforcing layers 30. Alternatively, the connecting member 60 may also adopt other commonly used connection structures, which are not specifically limited here.

[0054] Please continue reading Figures 1 to 5 , and see Figure 6 , Figure 61 is a flow chart of a method for manufacturing a battery pack 100 in the present invention. The method for manufacturing a battery pack 100 includes:

[0055] Step S10 : placing the battery pack 20 in the receiving cavity 12 of the housing 10 .

[0056] Specifically, firstly, a plurality of battery cells are electrically connected in series or in parallel or in series and parallel to form a battery pack 20, and then the battery pack 20 is placed in the receiving cavity 12 through the opening of the receiving cavity 12 of the shell 10, wherein the discharge end of the battery pack 20 is placed toward the opening.

[0057] Step S20 : ​​placing the reinforcement layer 30 at the discharge end of the battery pack 20 .

[0058] After the battery pack 20 is placed in the receiving cavity 12, the reinforcing layer 30 is directly laid flat at the discharge end of the battery pack 20. If multiple reinforcing layers 30 are required, the multiple reinforcing layers 30 can be stacked in sequence, and the channel holes 32 on the multiple reinforcing layers 30 are aligned with each other. If multiple reinforcing layers 30 need to be connected by a connector 60, the multiple reinforcing layers 30 can be connected by the connector 60 first, and then placed at the discharge end of the battery pack 20.

[0059] Step S30 : pouring the fixing glue 40 into the receiving cavity 12 until the fixing glue 40 covers the reinforcing layer 30 and the battery pack 20 .

[0060] After the reinforcing layer 30 is placed on the battery pack 20 , the fixing glue 40 is poured into the receiving cavity 12 through the opening of the receiving cavity 12 . After entering the receiving cavity 12 , the fixing glue 40 flows into the channel hole 32 , thereby completely wrapping the battery pack 20 and the reinforcing layer 30 .

[0061] Optionally, in other embodiments, the order of step S20 and step S30 can be swapped, that is, the fixing glue 40 can be poured into the receiving cavity 12 first, and then the reinforcing layer 30 can be placed at the discharge end of the battery pack 20 before the fixing glue 40 foams and solidifies. At this time, the fixing glue 40 will enter the interior of the reinforcing layer 30 along the channel hole 32 and completely wrap the reinforcing layer 30.

[0062] In summary, the embodiment of the utility model fixes the reinforcing layer 30 and the battery pack 20 through the fixing glue 40, which not only eliminates the fixing structure of the reinforcing layer 30, reduces the design difficulty of the battery pack 100, simplifies the assembly process of the battery pack 100, improves production efficiency, and reduces costs, but also the fixing glue 40 can be filled into the channel hole 32 to fix the reinforcing layer 30 and the battery pack 20 in all directions, thereby improving the fixing effect of the reinforcing layer 30 and the battery pack 20 and making the performance of the battery pack 100 more stable.

[0063] The above description is only a preferred embodiment of the utility model, and does not limit the patent scope of the utility model. All equivalent structural changes made by using the contents of the utility model specification and drawings under the utility model concept, or directly / indirectly used in other related technical fields are included in the patent protection scope of the utility model.

Claims

1. A battery pack, characterized in that: include: The housing is provided with a receiving cavity; A battery pack is disposed in the receiving cavity; A reinforcement layer, arranged at the discharge end of the battery pack, and having a channel hole on the reinforcement layer; as well as A fixing glue is filled in the receiving cavity, and the fixing glue covers the reinforcing layer and the battery pack.

2. The battery pack according to claim 1, characterized in that: The reinforcement layer includes at least one of glass fiber cloth, carbon fiber cloth and aramid cloth.

3. The battery pack according to claim 1, characterized in that: The reinforcing layer includes a plurality of transverse portions and a plurality of vertical portions, wherein the plurality of transverse portions and the plurality of vertical portions are arranged crosswise with each other, and the plurality of transverse portions and the plurality of vertical portions are arranged in pairs to surround and form the channel hole.

4. The battery pack according to claim 3, characterized in that: The horizontal portion and the vertical portion are perpendicular to each other.

5. The battery pack according to claim 3, characterized in that: The width of the channel hole is L mm, where L≥1.

6. The battery pack according to claim 1, characterized in that: The thickness of the reinforcement layer is T mm, 1≤T≤2.

7. The battery pack according to claim 6, characterized in that: The number of the reinforcement layers is two or three, and the two or three reinforcement layers are stacked and arranged at the discharge end of the battery pack, and the channel holes on the plurality of reinforcement layers are interconnected.

8. The battery pack according to claim 7, characterized in that: The battery pack further includes a connector, which connects two or three of the reinforcement layers.

9. The battery pack according to claim 1, characterized in that: The material of the fixing glue is foam glue.

10. The battery pack according to claim 1, characterized in that: The outer shell comprises a shell and an upper cover, wherein 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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