Battery pack cover body structure and battery pack

Abstract

The utility model relates to a battery pack cover body structure and a battery pack, in the battery pack cover body structure, a substrate is used for covering a box body, the substrate and the box body are enclosed to form an accommodating cavity, and the accommodating cavity is used for accommodating a plurality of single battery cells and polystyrene foam arranged along a plurality of glue filling tracks; the exhaust part is adjacent to the middle of the substrate; the exhaust part is provided with a plurality of exhaust holes, and at least one exhaust hole is formed between every two adjacent glue pouring tracks, so that gas is exhausted in time in the full-potting foaming process of the battery pack, and bubbles are prevented from remaining in the box cover; during full-potting foaming, polystyrene foam is merged towards the middle from the two adjacent glue pouring tracks, bubbles are slowly squeezed to the middle, the bubbles generated in the box body in the foaming process can be effectively discharged through the exhaust holes formed between the two adjacent glue pouring tracks, cavitation caused by foaming is avoided, and the foaming quality of the box body is improved. The box cover bonding performance and the overall strength of the polystyrene foam can be improved, so that the overall strength of the battery pack is improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery pack cover structure and a battery pack. Background Art

[0002] The battery pack uses filling and foaming technology, which can protect the battery from the influence of dust, temperature and humidity, reduce the risk of battery moisture, corrosion and short circuit; it can relieve the internal temperature of the battery and improve the safety of the battery; it also helps to reduce shock and extend the battery life.

[0003] In the prior art, for fully encapsulated foamed battery packs, many bubbles usually remain on the inner side of the box cover during the foaming process and cannot be discharged, and cavitation areas are easily formed where the bubbles remain. The cavitation areas directly affect the bonding performance of the box cover, resulting in a reduction in the overall strength of the battery pack. Utility Model Content

[0004] Based on this, it is necessary to provide a battery pack cover structure and a battery pack that can timely discharge gas during the full sealing and foaming process of the battery pack, avoid residual bubbles in the box cover, improve the adhesion performance of the box cover, and improve the overall strength of the battery pack to address the problems existing in the above-mentioned existing fully encapsulated and foamed battery packs.

[0005] In a first aspect, the present application provides a battery pack cover structure, comprising:

[0006] A base plate, the base plate is used to cover the box body, the base plate and the box body are enclosed to form a receiving cavity, and the receiving cavity is used to receive a plurality of single battery cells and foam glue arranged along a plurality of glue-filling tracks;

[0007] The exhaust part is arranged adjacent to the middle part of the substrate; the exhaust part is provided with a plurality of exhaust holes, and at least one exhaust hole is arranged between two adjacent glue filling tracks.

[0008] In one embodiment, the exhaust portion includes a plurality of exhaust areas, each exhaust area is arranged at intervals, a plurality of exhaust holes are arranged in the exhaust area, and exhaust holes corresponding to each exhaust area are arranged between two adjacent glue filling tracks.

[0009] In one embodiment, the distance between the exhaust area and the bottom of the box is greater than the distance between the substrate and the bottom of the box.

[0010] In one embodiment, the exhaust holes in the same exhaust area are arranged at equal intervals.

[0011] In one embodiment, the exhaust holes in the same exhaust area are arranged along the same central axis, and the central axis is perpendicular to the glue injection track.

[0012] In one embodiment, the width of the exhaust area is smaller than the spacing distance between two adjacent exhaust areas.

[0013] In one embodiment, the exhaust hole is a circular hole.

[0014] In one embodiment, the diameter of the exhaust hole is between 3 mm and 6 mm.

[0015] In one embodiment, the box body is provided with a plurality of first marking lines corresponding to the glue filling tracks, and the substrate is provided with second marking lines corresponding to the first marking lines; and exhaust holes corresponding to the exhaust areas are provided between two adjacent second marking lines.

[0016] In one of the embodiments, it further includes a fixing portion, which is disposed on the substrate and has a plurality of fixing holes.

[0017] In a second aspect, the present application provides a battery pack, comprising a plurality of single cells, a box body, and a battery pack cover structure as described above;

[0018] The battery pack cover structure and the box body are combined to form a receiving cavity, each single battery cell is arranged in the receiving cavity, and foam glue is arranged in the receiving cavity.

[0019] One of the above technical solutions has the following advantages and beneficial effects:

[0020] The above-mentioned battery pack cover structure includes a substrate and a venting portion. The substrate is used to cover the box body. The substrate and the box body are combined to form a accommodating cavity. The accommodating cavity is used to accommodate a plurality of single battery cells and foam glue arranged along a plurality of glue-filling tracks. The venting portion is arranged adjacent to the middle of the substrate. The venting portion is provided with a plurality of venting holes, and at least one venting hole is arranged between two adjacent glue-filling tracks, so as to discharge gas in time during the full encapsulation and foaming process of the battery pack and avoid residual bubbles in the box cover. The present application arranges the venting holes adjacent to the middle of the substrate, and at least one venting hole is located between two adjacent glue-filling tracks. Then, during the full encapsulation and foaming, the foam glue merges from the two adjacent glue-filling tracks toward the middle, and the bubbles are slowly squeezed to the middle. The venting holes arranged between the two adjacent glue-filling tracks can effectively discharge the bubbles generated in the box body due to the foaming process, avoid cavitation caused by foaming, and improve the box cover bonding performance and the overall strength of the foam glue, thereby improving the overall strength of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the assembly structure of the battery pack cover structure in the embodiment of the present application;

[0022] Figure 2 This is a schematic structural diagram of a battery pack cover structure from a first perspective in an embodiment of the present application;

[0023] Figure 3 A schematic diagram of the battery pack cover structure from a second viewing angle in an embodiment of the present application;

[0024] Figure 4 for Figure 3 Schematic diagram of the structure at A in the middle.

[0025] Reference numerals:

[0026] 100, substrate; 200, exhaust portion; 210, exhaust area; 212, exhaust hole; 300, fixing portion; 310, fixing hole; 400, single cell; 500, glue filling track. DETAILED DESCRIPTION

[0027] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0028] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present application described here. In addition, the terms "including" and "having" and any of their variations are intended to cover inclusions that are not listed. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0029] In the present application, the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.

[0030] In addition, some of the above terms may be used to express other meanings in addition to indicating orientation or positional relationship. For example, the term "on" may also be used to express a certain dependency or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to specific circumstances.

[0031] In addition, the term "plurality" shall mean two or more.

[0032] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0033] In one embodiment, Figure 1 and Figure 2 As shown, a battery pack cover structure is provided, including a substrate 100 and a vent portion 200; the substrate 100 is used to cover a box body, and the substrate 100 and the box body are enclosed to form a accommodating cavity, and the accommodating cavity is used to accommodate a plurality of single battery cells 400 and foam glue arranged along a plurality of glue filling tracks 500; the vent portion 200 is arranged adjacent to the middle of the substrate 100; the vent portion 200 is provided with a plurality of vent holes 212, and at least one vent hole 212 is arranged between two adjacent glue filling tracks 500.

[0034] The box body may be a metal box body or a non-metal box body, and the box body is provided with an opening, and the substrate 100 is used to cover the opening provided in the box body to achieve sealing of the box body. The substrate 100 may be a metal substrate 100 or a non-metal substrate 100. Exemplarily, the substrate 100 may be a flat plate structure, and the shape of the substrate 100 may be a polygon. It should be noted that the specific shape of the substrate 100 may be determined according to the shape of the box body, that is, it may be a flat plate or may not be a flat plate.

[0035] The box and the substrate 100 are enclosed to form a receiving cavity, which can be used to receive a plurality of single cells 400, each of which is arranged in an array, for example, each of which can be closely arranged in a plurality of rows and columns. The top of the single cell 400 is disposed adjacent to the substrate 100, and the bottom of the single cell 400 is disposed adjacent to the bottom of the box, and the top of the single cell 400 can be an electrode output terminal. Exemplarily, the single cell 400 is a cylindrical cell.

[0036] The receiving cavity can also be used to receive foam glue. For example, the foaming machine can be used to output foam glue. The foaming machine can inject the foam glue into the receiving cavity provided with the corresponding single battery cell 400 based on the preset glue injection track 500, so that the foam glue arranged along the preset glue injection track 500 is formed in the receiving cavity. Exemplarily, the preset glue injection track 500 can be an S-shaped glue injection track 500, that is, the preset glue injection track 500 can be divided into a plurality of tracks for glue injection, so that the foam glue arranged along the plurality of glue injection tracks 500 is formed in the receiving cavity. The foam glue just injected into the receiving cavity is in a liquid state and has fluidity; after the foam glue of the corresponding glue injection track 500 comes into contact with the air, it will expand, so that the foam glue can fill the gap between the single battery cells 400 and the single battery cells 400, thereby filling the remaining space in the receiving cavity. It should be noted that when the foam glue is in contact with the air for a preset time, the foam glue will solidify and then form solid foam glue, which can fix each single battery cell 400 in the accommodating cavity and prevent the single battery cell 400 from shaking. At the same time, it can prevent the single battery cell 400 from being affected by dust, temperature and humidity, reduce the risk of battery moisture, corrosion and short circuit, and improve the safety of the battery pack; it can also help to reduce shock and extend the battery life.

[0037] The exhaust portion 200 and the substrate 100 are integrally formed. The exhaust portion 200 may be in a long strip shape. Exemplarily, the exhaust portion 200 intersects with each glue injection track 500, for example, the exhaust portion 200 may be perpendicular to each glue injection track 500. The middle of the substrate 100 refers to the center point of the substrate 100. The exhaust portion 200 may be provided with a plurality of exhaust holes 212, and each exhaust hole 212 is arranged at intervals.

[0038] By setting the exhaust portion 200 adjacent to the middle of the substrate 100 and providing at least one exhaust hole 212 between two adjacent glue filling tracks 500, when the battery pack is fully encapsulated and foamed, the foamed glue merges toward the middle from the two adjacent glue filling tracks 500, and the bubbles are slowly squeezed to the middle. The exhaust hole 212 provided between the two adjacent glue filling tracks 500 can effectively exhaust the gas to avoid cavitation caused by foaming.

[0039] In one example, four glue filling tracks 500 are arranged in the box, and one glue filling track 500 is arranged for every four columns of single battery cells 400. At least one exhaust hole 212 is located between two adjacent glue filling tracks 500, and the exhaust hole 212 is located close to the middle position of the glue filling track 500. When each single battery cell 400 in the box is fully encapsulated and foamed, the foamed glue merges from the two adjacent glue filling tracks 500 toward the middle, and the bubbles are slowly squeezed to the middle of the glue filling track 500. The gas can be effectively discharged through the exhaust holes 212 arranged between the two adjacent glue filling tracks 500 to avoid residual bubbles in the box.

[0040] It should be noted that when the substrate 100 is in the open state, foam glue can be poured into the box body through a foaming machine, and after the glue filling is completed, the substrate 100 is covered on the opening of the box body to achieve sealing of the box body. After the foam glue foams and expands in the box body, it gradually fills the accommodating cavity space of the box body, and the gas is discharged through the exhaust holes 212 provided in the exhaust part 200, thereby effectively discharging the bubbles generated in the box body due to the foaming process.

[0041] In the above-mentioned embodiment, a box body is covered by the substrate 100, and the substrate 100 and the box body are enclosed to form a accommodating cavity, and the accommodating cavity is used to accommodate a plurality of single battery cells 400 and foam glue arranged along a plurality of glue filling tracks 500; the exhaust portion 200 is arranged adjacent to the middle of the substrate 100; the exhaust portion 200 is provided with a plurality of exhaust holes 212, and at least one exhaust hole 212 is provided between two adjacent glue filling tracks 500, so as to realize timely exhaust of gas during the full encapsulation and foaming process of the battery pack and avoid residual bubbles in the box cover. The present application arranges the exhaust hole 212 near the middle of the substrate 100, and at least one exhaust hole 212 is located between two adjacent glue filling tracks 500. Therefore, during full encapsulation and foaming, the foamed glue merges toward the middle from the two adjacent glue filling tracks 500, and the bubbles are slowly squeezed to the middle. The exhaust hole 212 arranged between the two adjacent glue filling tracks 500 can effectively discharge the bubbles generated in the box body during the foaming process, avoiding cavitation caused by foaming, and can improve the adhesion performance of the box cover and the overall strength of the foamed glue, thereby improving the overall strength of the battery pack.

[0042] In one embodiment, Figure 2 As shown, the exhaust portion 200 includes a plurality of exhaust areas 210 , each exhaust area 210 is arranged at intervals, the exhaust area 210 is provided with a plurality of exhaust holes 212 , and exhaust holes 212 corresponding to each exhaust area 210 are arranged between two adjacent glue filling tracks 500 .

[0043] The exhaust area 210 is in a strip shape. For example, the exhaust portion 200 may include four exhaust areas 210, which are spaced apart from each other. For example, the four exhaust areas 210 may be symmetrically arranged based on the central axis of the substrate 100, and the central axis of the substrate 100 is perpendicular to the glue injection track 500.

[0044] The exhaust area 210 is provided with a plurality of exhaust holes 212, and the number of the exhaust holes 212 can be determined according to the number of single battery cells 400 in the accommodating cavity. For example, one glue filling track 500 can be provided for every four columns of single battery cells 400, that is, exhaust holes 212 of the corresponding exhaust area 210 are provided in every four columns of single battery cells 400.

[0045] By setting the exhaust part 200 adjacent to the middle of the substrate 100, and setting exhaust holes 212 corresponding to the exhaust areas 210 between two adjacent glue-filling tracks 500, when the battery pack is fully encapsulated and foamed, the foam glue merges toward the middle from the two adjacent glue-filling tracks 500, and the bubbles are squeezed toward the middle of the glue-filling tracks 500. When the bubbles are adjacent to the exhaust holes 212 of the exhaust area 210, the bubbles can be discharged through the exhaust holes 212 of the corresponding exhaust area 210. The exhaust holes 212 set between the two adjacent glue-filling tracks 500 can effectively discharge gas to avoid cavitation caused by foaming. By setting a plurality of exhaust holes 212 at intervals between the two adjacent glue-filling tracks 500 along the glue-filling tracks 500, since the foam glue will be displaced during the foaming process, the bubbles can be discharged from the adjacent exhaust holes 212 to avoid congestion and failure to be discharged in time, thereby further improving the efficiency of bubble discharge and ensuring that the bubbles can be discharged completely.

[0046] Exemplarily, the number of exhaust regions 210 can be determined based on the size of the box housing cavity. For example, for a box housing cavity of a larger size, the corresponding glue injection track is longer, and the exhaust section 200 can be provided with multiple exhaust regions 210, each exhaust region 210 is arranged at intervals, so that multiple exhaust holes 212 are arranged at intervals between two adjacent glue injection tracks 500 along the glue injection track 500. Since the foaming glue will be displaced during the foaming process, the bubbles can be discharged from the adjacent exhaust holes 212, avoiding the congestion of bubbles and failure to be discharged in time, thereby further improving the efficiency of bubble discharge and ensuring that the bubbles can be discharged. For a box housing cavity of a smaller size, the corresponding glue injection track is shorter, and the exhaust section 200 can be provided with one exhaust region 210, which is arranged at intervals in the middle of the substrate 100, and the bubbles are squeezed toward the middle of the glue injection track 500, and when the bubbles are adjacent to the exhaust holes 212 of the exhaust region 210, the bubbles can be discharged through the exhaust holes 212 of the corresponding exhaust region 210, avoiding cavitation caused by foaming.

[0047] It should be noted that the exhaust hole 212 is connected to the external environment, so the size of the exhaust hole 212 should not be too large or too small. If the exhaust hole 212 is too large, excessive foam will be discharged from the exhaust hole to the outside, affecting the appearance of the product; if the exhaust hole 212 is too small, it is easy to cause blockage, resulting in the inability to completely discharge the bubbles in the box.

[0048] In one embodiment, the box body is provided with a plurality of first marking lines corresponding to the glue filling tracks, and the substrate 100 is provided with second marking lines corresponding to the first marking lines; and exhaust holes 212 corresponding to the exhaust areas 210 are provided between two adjacent second marking lines.

[0049] Among them, a plurality of first marking lines can be set on one side of the box body, and each first marking line corresponds to each glue filling track 500 one by one. Then, when glue needs to be filled in the box body, foam glue can be poured into the box body based on the first marking lines, that is, foam glue arranged along the preset glue filling track is formed in the box body.

[0050] A plurality of second marking lines are arranged on the substrate 100, and each second marking line is arranged in one-to-one correspondence with each first marking line. For example, when the substrate 100 is covered on the box, the second marking line can be located on the same straight line as the corresponding first marking line. It should be noted that the second marking line can be arranged on the substrate by silk screen printing or engraving, and the first marking line can be arranged on the substrate by silk screen printing or engraving.

[0051] By setting a first marking line on the box body, it is convenient for the user to fill the foam glue into the box body based on the preset glue filling track 500. By setting a second marking line on the substrate 100, it is convenient to match and position the second marking line with the corresponding glue filling track. When the battery pack is fully encapsulated and foamed, the foam glue merges toward the middle from the two adjacent second marking lines, and the bubbles are squeezed toward the middle of the second marking lines. When the bubbles are adjacent to the exhaust holes 212 of the exhaust area 210, the bubbles can be discharged through the exhaust holes 212 of the corresponding exhaust area 210 to avoid cavitation caused by foaming.

[0052] In one embodiment, the distance between the exhaust area 210 and the bottom of the box is greater than the distance between the substrate 100 and the bottom of the box.

[0053] For example, the exhaust area 210 may be a convex structure, so that the distance between the exhaust area 210 and the bottom of the box is greater than the distance between the substrate 100 and the bottom of the box, that is, the relative height of the exhaust area 210 and the box is greater than the relative height of the substrate 100 and the box, so that the exhaust hole 212 of the exhaust area 210 is located at the highest point of the substrate 100, so that when the battery pack is fully encapsulated and foamed, the foamed glue merges toward the middle from two adjacent glue filling tracks 500, and the bubbles are slowly squeezed to the middle. By setting the exhaust hole 212 between the two adjacent glue filling tracks 500 and based on the exhaust hole 212 being located at the highest point of the substrate 100, the bubbles generated in the box due to the foaming process can be effectively discharged, and cavitation caused by foaming can be avoided. The bonding performance of the box cover and the overall strength of the foamed glue can be improved, thereby improving the overall strength of the battery pack.

[0054] In one embodiment, Figure 3 and Figure 4 As shown, the exhaust holes 212 of the same exhaust area 210 are arranged at equal intervals.

[0055] For example, eight glue filling tracks 500 are arranged in the accommodating cavity, and seven exhaust holes 212 are arranged in the same exhaust area 210, one exhaust hole 212 of the corresponding exhaust area 210 is arranged between two adjacent glue filling tracks 500, and one glue filling track 500 is set for every four columns of single battery cells 400. By equidistantly arranging the exhaust holes 212 of the same exhaust area 210, the corresponding exhaust holes 212 of the exhaust area 210 are located in the middle of two adjacent glue filling tracks 500. When the single battery cells 400 in the box are fully encapsulated and foamed, the foamed glue merges from the two adjacent glue filling tracks 500 toward the middle, and the bubbles are slowly squeezed to the middle of the glue filling track 500. The gas can be effectively discharged through the exhaust holes 212 arranged between the two adjacent glue filling tracks 500 to avoid residual bubbles in the box, thereby improving the bonding performance of the box cover and the overall strength of the foamed glue.

[0056] For example, Figure 3 As shown, the exhaust holes 212 of the same exhaust area 210 are arranged along the same central axis, and the central axis is perpendicular to the glue injection track 500 .

[0057] For example, the glue pouring track 500 may be in a straight line, and each glue pouring track 500 is sequentially connected to form an S-shaped glue pouring track 500. The exhaust holes 212 of the same exhaust area 210 have the same size and shape, for example, the exhaust hole 212 may be a circular hole. The central axis may be the central long axis of the exhaust area 210. The central axis and the connecting line of the center points of each exhaust hole 212 overlap each other.

[0058] The exhaust holes 212 based on the same exhaust area 210 are arranged along the same central axis, and the central axis is perpendicular to the glue filling track 500. The corresponding exhaust holes 212 of the exhaust area 210 are located in the middle of two adjacent glue filling tracks 500. When the box is fully filled and foamed, the foamed glue merges toward the middle from the two adjacent glue filling tracks 500, and the bubbles are slowly squeezed to the middle of the glue filling track 500. The exhaust holes 212 arranged between the two adjacent glue filling tracks 500 can effectively exhaust the gas to avoid residual bubbles in the box, thereby improving the box cover bonding performance and the overall strength of the foamed glue; in addition, the simplified design of the cover structure can reduce the internal beams of the box, reduce the wall thickness of the box, and reduce the corresponding number of fasteners, thereby reducing the weight of the battery pack, while also improving the energy density of the battery pack and reducing costs.

[0059] In one embodiment, Figure 3 and Figure 4 As shown, the width of the exhaust region 210 is smaller than the spacing distance between two adjacent exhaust regions 210 .

[0060] For example, by setting the exhaust area 210 as a raised structure, the relative height of the exhaust area 210 is greater than the relative height of the substrate 100. In addition, by setting the width of the exhaust area 210 to be smaller than the spacing distance between two adjacent exhaust areas 210, when the box is fully filled and foamed, the foam glue merges toward the middle from two adjacent glue filling tracks 500, so that the bubbles are slowly squeezed to the exhaust area 210, and then discharged through the exhaust holes 212 on the exhaust area 210. In this way, the exhaust holes 212 set in the corresponding exhaust area 210 between the two adjacent glue filling tracks 500 can effectively discharge the bubbles generated in the box due to the foaming process, avoid cavitation caused by foaming, and can improve the bonding performance of the box cover and the overall strength of the foam glue, thereby improving the overall strength of the battery pack.

[0061] In one embodiment, the diameter of the exhaust hole 212 is between 3 mm and 6 mm (millimeter). The diameter of the exhaust hole 212 refers to the diameter of the exhaust hole 212. For example, the diameter of the exhaust hole 212 can be 3 mm, 5 mm or 6 mm.

[0062] By setting the aperture of the exhaust hole 212 between 3 mm and 6 mm, when each single battery cell 400 in the box is fully encapsulated and foamed, the foam glue merges toward the middle from two adjacent glue filling tracks 500, and the bubbles are slowly squeezed to the middle of the glue filling track 500. The exhaust hole 212 set between the two adjacent glue filling tracks 500 can effectively discharge the bubbles generated in the box due to the foaming process, avoiding blockage caused by the exhaust hole 212 being too small and unable to discharge the bubbles in time, and avoiding the exhaust hole 212 being too large to cause the foam glue to be discharged, further improving the adhesion performance of the box cover and the overall strength of the foam glue, thereby improving the overall strength of the battery pack.

[0063] In one embodiment, Figure 2 and Figure 3 As shown, the battery pack cover structure further includes a fixing portion 300 , which is disposed on the substrate 100 , and is provided with a plurality of fixing holes 310 .

[0064] The fixing portion 300 may be provided with two fixing holes 310, and the two fixing holes 310 are arranged at intervals. For example, a fastener (such as a bolt) may be passed through the fixing hole 310 to lock the substrate 100 on the box, thereby installing the substrate 100 on the box, simplifying the design of the cover structure, reducing the internal beams of the box, eliminating the need for excessive fasteners, reducing the weight of the battery pack, and improving the energy density of the battery pack and reducing costs.

[0065] In one embodiment, a battery pack is further provided, comprising a plurality of single cells, a box body and a battery pack cover structure as described above; the battery pack cover structure and the box body are combined to form a receiving cavity, each single cell is arranged in the receiving cavity, and foam glue is arranged in the receiving cavity.

[0066] The single cell may be a cylindrical lithium-ion cell. The single cells may be arranged in a plurality of rows and columns in a close arrangement in the receiving cavity. The foaming machine may be used to pour foam glue into the receiving cavity, and the foaming machine may pour the foam glue into the receiving cavity provided with the corresponding single cell based on a preset glue pouring track, thereby forming foam glue arranged along the preset glue pouring track in the receiving cavity.

[0067] For the specific description of the battery pack cover structure, single battery cells and box body, reference may be made to the specific description of the battery pack cover structure, single battery cells and box body in the above embodiments, which will not be repeated here.

[0068] In the above embodiment, a box body is provided through a substrate cover, and the substrate and the box body are enclosed to form a accommodating cavity, and the accommodating cavity is used to accommodate a plurality of single battery cells and foam glue arranged along a plurality of glue filling tracks; the exhaust portion is arranged adjacent to the middle of the substrate; the exhaust portion is provided with a plurality of exhaust holes, and at least one exhaust hole is provided between two adjacent glue filling tracks, so as to realize timely exhaust of gas during the full encapsulation and foaming process of the battery pack and avoid residual bubbles in the box cover. The present application arranges the exhaust holes adjacent to the middle of the substrate, and at least one exhaust hole is located between two adjacent glue filling tracks, so that during full encapsulation and foaming, the foam glue merges from two adjacent glue filling tracks toward the middle, and the bubbles are slowly squeezed to the middle. The exhaust holes provided between two adjacent glue filling tracks can effectively exhaust the bubbles generated in the box body due to the foaming process, avoid cavitation caused by foaming, and improve the adhesion performance of the box cover and the overall strength of the foam glue, thereby improving the overall strength of the battery pack.

[0069] It should be noted that the battery pack may also include components such as output electrodes, and the specific battery pack may include more components than those described in the above embodiments, or combine certain components, or have a different arrangement of components.

[0070] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0071] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the utility model patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the attached claims.

Claims

1. A battery pack cover structure, characterized in that: include: A substrate, the substrate is used to cover the box body, the substrate and the box body are enclosed to form a receiving cavity, the receiving cavity is used to receive a plurality of single battery cells and foam glue arranged along a plurality of glue-filling tracks; The exhaust part is arranged adjacent to the middle part of the substrate; the exhaust part is provided with a plurality of exhaust holes, and at least one exhaust hole is arranged between two adjacent glue filling tracks.

2. The battery pack cover structure according to claim 1, characterized in that: The exhaust portion includes a plurality of exhaust areas, each of the exhaust areas is arranged at intervals, the exhaust area is provided with a plurality of exhaust holes, and exhaust holes corresponding to each of the exhaust areas are arranged between two adjacent glue filling tracks.

3. The battery pack cover structure according to claim 2, characterized in that: The distance between the exhaust area and the bottom of the box is greater than the distance between the substrate and the bottom of the box.

4. The battery pack cover structure according to claim 2, characterized in that: The exhaust holes in the same exhaust area are arranged at equal intervals.

5. The battery pack cover structure according to claim 4, characterized in that: The exhaust holes in the same exhaust area are arranged along the same central axis, and the central axis is perpendicular to the glue pouring track.

6. The battery pack cover structure according to claim 4, characterized in that: The width of the exhaust area is smaller than the spacing distance between two adjacent exhaust areas.

7. The battery pack cover structure according to claim 1, characterized in that: The exhaust hole is a circular hole.

8. The battery pack cover structure according to claim 7, characterized in that: The diameter of the exhaust hole is between 3 mm and 6 mm.

9. The battery pack cover structure according to claim 2, characterized in that: The box body is provided with a plurality of first marking lines corresponding to the glue injection tracks, and the substrate is provided with second marking lines corresponding to the first marking lines; and exhaust holes corresponding to the exhaust areas are provided between two adjacent second marking lines.

10. The battery pack cover structure according to any one of claims 1 to 9, characterized in that: It also includes a fixing part, which is arranged on the substrate and has a plurality of fixing holes.

11. A battery pack, characterized in that: It comprises a plurality of single cells, a box body and a battery pack cover structure as claimed in any one of claims 1 to 10; The battery pack cover structure and the box body are combined to form a receiving cavity, each of the single cells is arranged in the receiving cavity, and foam glue is arranged in the receiving cavity.

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