Battery pack and electric equipment

Abstract

The utility model relates to a battery pack and electric equipment. The battery pack comprises a shell, a battery assembly and a glue pouring structure, a containing cavity is formed in the shell, the battery assembly is arranged in the containing cavity, and a filling cavity is formed between the side wall of the battery assembly and at least part of the side wall of the shell. The glue filling structure comprises a first glue filling part, the first glue filling part is arranged in the filling cavity, a first gap is formed between the top surface of the first glue filling part and the top cover of the shell in the height direction of the battery pack, the first gap is used as an exhaust channel, and the exhaust channel is used for exhausting gas in the accommodating cavity to the outside of the battery pack. Therefore, in the glue filling process of the battery pack, air in the accommodating cavity can be guided into the first gap along with the increase of the volume of the glue filling structure, and is discharged out of the battery pack through the first gap. The problem that the bonding area of the glue pouring structure and the top cover of the shell is insufficient and the bonding is not firm due to the fact that the space of the containing cavity is occupied due to the fact that gas cannot be exhausted is solved. The structural strength and rigidity of the battery pack can be improved.

Description

Technical Field

[0001] The present disclosure relates to the technical field of battery packs, and in particular, to a battery pack and an electrical device. Background Art

[0002] A battery pack is a device used to provide energy to electrical equipment (such as vehicles) and is a core component of electrical equipment. In related technologies, after the battery pack is potted, "air trapping" is likely to occur between the cover and the battery pack shell, resulting in insufficient bonding area between the potting compound and the inner side of the upper cover, which is not conducive to improving the strength and rigidity of the battery pack. Utility Model Content

[0003] The purpose of the present disclosure is to provide a battery pack and an electrical device to solve the above technical problems.

[0004] In order to achieve the above-mentioned object, as a first aspect of the present disclosure, the present disclosure provides a battery pack, including a housing, a battery assembly and a glue potting structure;

[0005] A receiving cavity is formed in the housing, the battery assembly is disposed in the receiving cavity, and a filling cavity is provided between a side wall of the battery assembly and at least a portion of a side wall of the housing;

[0006] The glue filling structure includes a first glue filling part, which is arranged in the filling cavity. In the height direction of the battery pack, there is a first gap between the top surface of the first glue filling part and the top cover of the outer shell. The first gap is used as an exhaust channel, and the exhaust channel is used to discharge the gas in the accommodating cavity to the outside of the battery pack.

[0007] Optionally, the battery pack further includes an air guide, which is arranged on the top side of the battery assembly, and the gas channel of the air guide is suitable for communicating with the first gap to guide the gas in the accommodating cavity to the first gap.

[0008] Optionally, air holes are provided on the surface of the air guide, and the air holes are configured as air channels or configured to communicate with the gas channels inside the air guide.

[0009] Optionally, the air guide member includes a foam member, and a plurality of air holes are provided on the foam member, and the air holes are configured as the gas channels.

[0010] Optionally, there are multiple air guides, and the multiple air guides include multiple first air guides and multiple second air guides;

[0011] Each of the first air guides extends along the first direction, and a plurality of the first air guides are arranged at intervals along the second direction;

[0012] The second air guide extends along the second direction, a plurality of the second air guides are arranged at intervals along the first direction, and the first direction intersects the second direction;

[0013] The plurality of first air guides and the plurality of second air guides are arranged alternately.

[0014] Optionally, the two first air guides located outermost in the second direction and the two second air guides located outermost in the first direction form an annular frame, and the annular frame defines a glue filling area located on the top side of the battery assembly.

[0015] Optionally, the filling cavity includes a first cavity located at at least one end of the battery assembly along a first direction, the first glue-filling part includes a first side portion, the first side portion is located in the first cavity, and in the height direction of the battery pack, there is the first gap between the top surface of the first side portion and the top cover of the outer shell.

[0016] Optionally, a dimension of the accommodating cavity in a height direction of the battery pack is H1, and a height of the highest point or the lowest point of the top surface of the first side portion relative to a bottom surface of the accommodating cavity is L1, wherein L1 ≥ H1*1 / 3.

[0017] Optionally, the first direction is adapted to be the same as the width direction of the vehicle.

[0018] Optionally, the battery assembly includes a battery cell, and the bottom surface of the battery cell is arranged on the bottom surface of the accommodating cavity;

[0019] In the height direction of the battery pack, the highest point of the top surface of the first side portion is lower than the top surface of the battery cell, or the highest point of the top surface of the first side portion is flush with the top surface of the battery cell.

[0020] Optionally, the height of the highest point of the top surface of the first side portion is L1, and the height of the top surface of the battery unit is H2, wherein 3 / 4H2≤L1≤H2.

[0021] Optionally, the filling cavity includes a second cavity located at at least one end of the battery assembly along the second direction, and the glue pouring structure includes a second glue pouring portion, and the second glue pouring portion is located in the second cavity.

[0022] Optionally, the second direction is adapted to be the same as the length direction of the vehicle.

[0023] Optionally, the battery assembly includes a battery cell, and the bottom surface of the battery cell is arranged on the bottom surface of the accommodating cavity;

[0024] In the height direction of the battery pack, the highest point of the top surface of the second glue filling part is located below the top surface of the battery cell, or the highest point of the top surface of the second glue filling part is flush with the top surface of the battery cell.

[0025] Optionally, the height of the highest point of the top surface of the second glue-filling portion is L2, and the height of the top surface of the battery unit is H2, wherein 1 / 2H2≤L2≤H2.

[0026] Optionally, an explosion-proof valve is provided on the housing, and the first gap is connected to the explosion-proof valve to discharge the gas in the first gap to the outside of the battery pack.

[0027] Optionally, the battery assembly includes a battery module and a busbar assembly located above the battery module, a second gap is defined between the busbar assembly and the top cover of the housing, and a third gap is defined between the busbar assembly and the battery module;

[0028] The glue potting structure further includes a third glue potting portion, which includes a portion located in the second gap and a portion located in the third gap. The upper side of the battery assembly is bonded to the top cover of the housing via the third glue potting portion, or the lower side of the battery assembly is bonded to the inner bottom wall of the housing via structural adhesive. As a second aspect of the present disclosure, the present disclosure provides an electrical device including the above-mentioned battery pack.

[0029] Through the above technical solution, a first glue-filling section is provided between the sidewalls of the battery assembly and the sidewalls of the outer shell, and a first gap is formed between the top surface of the first glue-filling section and the top cover of the outer shell. As a result, during the battery glue-filling process, air within the accommodating cavity can be guided into the first gap as the volume of the glue-filling structure increases, and then discharged out of the battery pack through the first gap. This reduces the problem of insufficient bonding area between the glue-filling structure and the top cover of the outer shell due to gas not being able to escape and occupying space in the accommodating cavity, thus reducing the problem of weak bonding. This can improve the structural strength and rigidity of the battery pack.

[0030] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following detailed description, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings:

[0032] Figure 1 is a schematic top view of a battery pack provided in one embodiment of the present disclosure, wherein the top cover is not shown;

[0033] Figure 2 yesFigure 1 Cross-section along the AA direction;

[0034] Figure 3 yes Figure 1 Cross-section along the BB direction;

[0035] Figure 4 yes Figure 1 A magnified schematic diagram of part C;

[0036] Figure 5 is a schematic top view of a battery pack provided in one embodiment of the present disclosure, wherein the air guide is not shown;

[0037] Figure 6 Schematic diagram of an explosion of a battery pack provided in one embodiment of the present disclosure.

[0038] Description of Reference Numerals

[0039] 100-battery pack; 1-shell; 11-accommodating cavity; 12-filling cavity; 121-first cavity; 122-second cavity; 13-top cover; 14-shell; 2-battery assembly; 21-battery cell; 22-battery module; 23-bus assembly; 3-glue filling structure; 31-first glue filling part; 311-first side; 312-second side; 32-second glue filling part; 33-third glue filling part; 4-first gap; 5-air guide; 51-first air guide; 52-second air guide; 6-glue filling area; 7-second gap; 8-third gap; 10-fourth gap. DETAILED DESCRIPTION

[0040] The following describes the specific embodiments of the present disclosure in detail with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present disclosure and are not intended to limit the present disclosure.

[0041] In this disclosure, unless otherwise indicated, directional terms such as "upper" and "lower" are generally defined with reference to the drawing orientation of the corresponding drawings. These terms are used solely to facilitate description and simplify the present disclosure. They are not intended to indicate or imply that the devices or components referred to must have a specific orientation, structure, or operation. Therefore, they should not be construed as limitations of the present disclosure. "Inner" and "outer" refer to the inner and outer sides of the corresponding components. Furthermore, the terms "first" and "second," etc., are used solely for descriptive purposes and should not be construed as indicating or implying relative importance.

[0042] It should also be noted that, in the description of this disclosure, unless otherwise expressly specified or limited, the terms "disposed," "connected," "connected," and "installed" should be understood broadly. For example, they may refer to fixed connections, detachable connections, or integral connections; and they may refer to direct connections or indirect connections via an intermediary. Those skilled in the art will understand the specific meanings of these terms in this disclosure based on specific circumstances.

[0043] The inventors have discovered that in related technologies, the main purpose of injecting potting glue into the battery pack is to achieve strong binding of the internal components of the battery pack with large structural parts such as the box and top cover through filling, fixing and bonding, so as to realize the integration and structuring of the battery pack; at the same time, it can also improve the temperature consistency of the thermal management of the entire pack, block high temperature when thermal runaway anomalies occur, and upgrade the insulation capacity during strong electrical connections.

[0044] In the process of pouring the colloid into the interior of the battery pack, if the air in the accommodating cavity cannot be discharged in time, gas will accumulate at the bonding interface between the battery pack shell and the potting glue, resulting in air entrapment anomaly. The potting glue cannot fill the air trapped area, and the air trapped area will form a gap space inside the potting glue. This air trapped anomaly is particularly serious in the top cover bonding scenario, causing the actual bonding area between the potting glue and the top cover to be lower than the design value, resulting in a decrease in the bonding effect of the top cover, which is not conducive to improving the stiffness and strength of the battery pack.

[0045] Based on this, as the first aspect of this disclosure, Figures 1 to 6 As shown, the present disclosure provides a battery pack 100, including a housing 1, a battery assembly 2, and a glue potting structure 3. A receiving cavity 11 is formed in the housing 1, and the battery assembly 2 is disposed in the receiving cavity 11. A filling cavity 12 is provided between the side wall of the battery assembly 2 and at least a portion of the side wall of the housing 1.

[0046] The glue filling structure 3 includes a first glue filling part 31, which is arranged in the filling cavity 12. In the height direction of the battery pack 100, there is a first gap 4 between the top surface of the first glue filling part 31 and the top cover 13 of the outer shell 1. The first gap 4 is used as an exhaust channel, which is used to discharge the gas in the accommodating cavity 11 to the outside of the battery pack 100, for example, through the explosion-proof valve described below.

[0047] Through the above technical solution, a first glue-filling portion 31 is provided between the side wall of the battery assembly 2 and the side wall of the outer shell 1, and a first gap 4 is formed between the top surface of the first glue-filling portion 31 and the top cover 13 of the outer shell 1. As a result, during the glue-filling process of the battery pack, the air in the accommodating cavity 11 can be guided into the first gap 4 as the volume of the glue-filling structure 3 increases, and then discharged to the outside of the battery pack 100 through the first gap 4. This reduces the problem of insufficient bonding area between the glue-filling structure 3 and the top cover 13 of the outer shell 1 due to the inability of gas to be discharged and occupying the space in the accommodating cavity 11, thereby reducing the problem of weak bonding. The structural strength and rigidity of the battery pack 100 can be improved.

[0048] In order to improve the exhaust effect, optionally, as Figure 2 and Figure 3 As shown, the battery pack 100 further includes an air guide 5, which is arranged on the top side of the battery assembly 2 (i.e., the upper side in the direction of the drawing). The gas channel of the air guide 5 is adapted to communicate with the first gap 4 to guide the gas in the accommodating cavity 11 to the first gap 4. Since the top cover 13 of the outer shell 1 is bonded to the shell 14 of the outer shell 1 (also referred to as the battery tray) through the glue potting structure 3, the glue potting structure 3 is also filled in the accommodating cavity 11 between the top cover 13 and the battery assembly 2. By arranging the air guide 5 on the top side of the battery assembly 2, the air in the accommodating cavity 11 between the top cover 13 and the battery assembly 2 can be guided into the first gap 4 through the air guide 5, thereby reducing the space occupied by the air, so that the glue potting structure 3 located in the accommodating cavity 11 can utilize a larger space, fit more closely to the top cover 13 of the outer shell 1, and improve the bonding effect.

[0049] The present disclosure does not limit the specific structure of the air guide 5. Optionally, the surface of the air guide 5 is provided with air holes, and the air holes are constructed as gas channels or are constructed to be connected to the gas channels inside the air guide 5. During the glue filling process of the battery pack 100, as the glue filling structure 3 is injected, the air in the accommodating cavity 11 can enter the air guide 5 through the air holes on the surface of the air guide 5. Since the multiple air holes are interconnected, the air in the accommodating cavity 11 can enter the air guide 5 through a part of the air holes, and then be discharged into the first gap 4 through another part of the air holes connected to the first gap 4. Alternatively, the air in the accommodating cavity 11 can also enter the gas channel in the air guide 5 through the air holes. The gas channel can guide the air to the air hole near the first gap 4, and then be discharged through the air hole to discharge the air out of the shell 14 of the battery pack 100.

[0050] In addition, the air holes can not only guide the air to the first gap 4 , but also store the air in the air holes, thereby reducing the space occupied by the air in the accommodating cavity 11 and improving the fit between the glue filling structure 3 and the top cover 13 .

[0051] This disclosure does not limit the specific type of air guide 5. In some embodiments provided herein, the air guide 5 comprises a foam member having multiple air holes formed therein, which serve as air passages. Because the foam member is compressible and lightweight, it does not burden the battery assembly 2 when installed within the battery pack 100. Furthermore, because the foam member is compressible, it does not interfere with the top cover 13 during installation, ensuring proper fastening and installation of the top cover 13.

[0052] Here, it should be noted that the present disclosure does not limit the specific material of the foam part. For example, it can be one of Si type, PU type, EPDM (Ethylene Propylene Diene Monomer), CR (Chloroprene rubber), EVA (Ethylene Vinyl Acetate Copolymer) and SBR (Polymerized Styrene Butadiene Rubber).

[0053] In order to improve the gas conduction effect, Figure 4 As shown, optionally, there are multiple air guides 5, and the multiple air guides 5 include multiple first air guides 51 and multiple second air guides 52. Each first air guide 51 extends along the first direction, and the multiple first air guides 51 are arranged at intervals along the second direction. The second air guides 52 extend along the second direction, and the multiple second air guides 52 are arranged at intervals along the first direction, and the first direction intersects the second direction. The multiple first air guides 51 and the multiple second air guides 52 are arranged in a staggered manner.

[0054] Since the contact area between the top side of the battery assembly 2 and the top cover 13 of the outer shell 1 is large, a plurality of first air guides 51 and second air guides 52 extending in different directions are arranged at intervals to cover the space between the top side of the battery assembly 2 and the top cover 13 of the outer shell 1, so that the gas between the glue filling structure 3 and the top cover 13 caused by the glue filling process of the battery pack 100 can be guided into the first gap 4 through different first air guides 51 or second air guides 52, and then discharged from the shell 14 of the battery pack 100, further improving the exhaust effect of the air guide 5.

[0055] Alternatively, as Figure 1 As shown, the first direction and the second direction may also be perpendicular to each other.

[0056] In order to ensure the glue filling effect, Figure 4As shown, optionally, the two first air guides 51 located on the outermost side in the second direction and the two second air guides 52 located on the outermost side in the first direction enclose an annular frame, and the annular frame defines a glue filling area 6 located on the top side of the battery assembly 2. During the glue filling process, in order to ensure that the amount of glue filled can both play the role of fixing and sealing the battery pack 100 and not make the amount of glue poured too large, resulting in difficulty in installing the battery pack 100, the amount of glue poured into each area in the battery pack 100 is calculated. By enclosing the glue filling area 6 by the two first air guides 51 and the two second air guides 52, the glue designed to be poured into the gap between the top cover 13 of the shell 1 and the battery assembly 2 can be confined to the glue filling area 6, thereby ensuring that the glue in the glue filling area 6 will not leak out, resulting in a decrease in the amount of glue, or that the glue from other external parts will flow into the glue filling area 6, resulting in an increase in the amount of glue in the glue filling area 6, thereby ensuring the normal filling and operation of the battery pack 100.

[0057] It should be noted here that the present disclosure does not limit the specific positions of the first air guide 51 and the second air guide 52 that enclose the glue filling area 6. In one embodiment provided in the present disclosure, the two first air guides 51 and the two second air guides 52 can be respectively arranged close to the edges of the battery assembly 2 to enclose as much of the top surface of the battery assembly 2 as possible in the glue filling area 6, thereby improving the connection strength between the upper part of the battery assembly and the top cover 13, thereby improving the structural strength and rigidity of the battery pack 100.

[0058] Optionally, the projection of the area defined by the outer wall of the annular frame along the height direction of the battery pack 100 onto the bottom plate of the housing 1 is a first projection, and the projection of the area defined by the outer wall of the battery pack along the height direction of the battery pack 100 onto the bottom plate of the housing 1 is a second projection, with the second projection coinciding with the first projection. This arrangement increases the area of ​​the glue filling area 6, thereby increasing the glue filling volume and improving the bonding strength of the top cover 13 of the housing 1.

[0059] In some embodiments of the present disclosure, Figure 1 and Figure 2As shown, the filling cavity 12 includes a first cavity 121 located at at least one end of the battery assembly 2 along the first direction. The first glue-filling portion 31 includes a first side portion 311 located within the first cavity 121. A first gap 4 is defined between the top surface of the first side portion 311 and the top cover 13 of the outer shell 1 in the height direction of the battery pack 100. By disposing the first side portion 311 within the first cavity 121 at one end of the battery pack 100 along the first direction, a first gap 4 is formed between the top surface of the first side portion 311 and the top cover 13 of the outer shell 1, serving as an exhaust channel. This arrangement allows air between the top side of the battery assembly 2 and the top cover 13 of the outer shell 1 to be discharged from the battery pack 100 during the glue-filling process through the first gap 4 located on one side of the battery assembly 2 along the first direction, shortening the exhaust path.

[0060] Alternatively, as Figure 2 As shown, the filling cavity 12 also includes a first cavity 121 located at the other end of the battery assembly 2 along the first direction. The first glue pouring portion 31 includes a second side portion 312, which is located within the first cavity 121. In the height direction of the battery pack 100, a first gap 4 is defined between the top surface of the second side portion 312 and the top cover 13 of the outer shell 1. Thus, during the glue pouring process, air between the top side of the battery assembly 2 and the top cover 13 of the outer shell 1 can be exhausted from the battery pack 100 through the first gaps 4 located on both sides of the battery assembly 2 along the first direction, thereby increasing the number of exhaust channels and improving exhaust efficiency.

[0061] The present disclosure does not limit the height dimension relationship between the accommodating cavity 11, the battery assembly 2, and the first side portion 311. In some embodiments of the present disclosure, such as Figure 2 As shown, the dimension of the accommodating cavity 11 in the height direction of the battery pack 100 is H1, and the height of the highest or lowest point of the top surface of the first side portion 311 relative to the bottom surface of the accommodating cavity 11 is L1, where L1 ≥ H1*1 / 3. With this arrangement, the difference between H1 and L1 is equivalent to the dimension of the first gap 4 in the height direction of the battery pack 100. Limiting the dimension of L1 to the range of L1 ≥ H1*1 / 3 ensures that the glue filling of the first side portion 311 can effectively secure the battery assembly 2 and cushion lateral impacts, while also ensuring that the first gap 4 can achieve the desired venting effect.

[0062] Optionally, the first direction can be the same as the width of the vehicle. For example, the first direction can be the length of the battery pack. The first side portion 311 is provided on one side of the battery assembly 2 along the width of the vehicle to cushion the battery pack 100 from side impacts and collisions, reducing damage to key components within the battery pack 100. It also serves to secure the battery assembly 2 and increase the mechanical strength of the battery pack 100.

[0063] In order to enhance the protective effect of the first side portion 311 on the battery assembly 2, optionally, the battery assembly 2 includes a battery cell 21, and the bottom surface of the battery cell 21 is arranged on the bottom surface of the accommodating cavity 11. In the height direction of the battery pack 100, the highest point of the top surface of the first side portion 311 is lower than the top surface of the battery cell 21, or the highest point of the top surface of the first side portion 311 is flush with the top surface of the battery cell 21. When the glue (especially the non-foaming glue) is injected into the first cavity 121, it is usually a fluid glue in liquid form. Such a setting can reduce the problem of the glue (especially the non-foaming glue) flowing abnormally to other areas (such as between the battery assembly 2 and the top cover 13), ensure the uniform distribution of the glue, and improve the potting effect.

[0064] Alternatively, as Figure 2 As shown, the height of the highest point on the top surface of the first side portion 311 is L1, and the height of the top surface of the battery cell 21 is H2, where 3 / 4H2≤L1≤H2. This arrangement can ensure that the first side portion 311 effectively protects and secures the battery cell 21 while reducing abnormal flow of the adhesive, ensuring uniform distribution of the adhesive and improving the potting effect.

[0065] It can be understood that the height of the top surface of the battery cell 21 here and below is H2, which can refer to the height of the upper surface of the shell of the battery cell 21. For example, in an embodiment where the battery cell 21 is composed of multiple battery cells, it can refer to the height of the upper surface of the shell of the battery cell 21 for installing the pole.

[0066] Alternatively, as Figure 3 As shown, the filling cavity 12 includes a second cavity 122 located at at least one end of the battery assembly 2 along the second direction, and the glue potting structure 3 includes a second glue potting portion 32 located in the second cavity 122. The first glue potting portion 31 and the second glue potting portion 32 are respectively arranged in the first cavity 121 and the second cavity 122 surrounding the battery assembly 2, which can not only fix the battery assembly 2 but also provide cushioning and protection for the battery assembly 2.

[0067] Optionally, the second direction is adapted to be the same as the length direction of the vehicle. For example, the second direction may be the length direction of the battery pack 100 .

[0068] In order to reduce the abnormal flow of glue to other areas, the battery pack 100 may optionally further include a sealing structure, which is used to separate the above-mentioned first cavity 121 and the second cavity 122, thereby reducing the abnormal flow of glue between the above-mentioned first cavity 121 and the second cavity 122 before the glue expands and solidifies, ensuring uniform distribution of glue, and improving the potting effect.

[0069] It should be noted that the present disclosure does not specifically limit the specific structure of the above-mentioned blocking structure. For example, it can be foam or rubber blocks, etc., and its purpose is to be able to separate the above-mentioned first cavity 121 and the second cavity 122.

[0070] The present disclosure does not specifically limit the specific arrangement number of the above-mentioned blocking structure constructed as glue-blocking foam or glue-blocking rubber blocks. Those skilled in the art can adaptively design the specific arrangement number of glue-blocking foam or glue-blocking rubber blocks according to actual application requirements.

[0071] In order to further improve the potting effect, such as Figure 3 As shown, the battery assembly 2 includes a battery cell 21, and the bottom surface of the battery cell 21 is arranged on the bottom surface of the accommodating cavity 11. In the height direction of the battery pack 100, the highest point of the top surface of the second glue filling part 32 is located below the top surface of the battery cell 21, or the highest point of the top surface of the second glue filling part 32 is flush with the top surface of the battery cell 21. In this way, the height of the first glue filling part 31 and the highest point of the second glue filling part 32 set at both ends of the battery assembly 2 along the first direction and the two ends along the second direction are both located below the top surface of the battery cell 21, or flush with the top surface of the battery cell 21. The problem of abnormal flow of glue to other areas (for example, between the battery assembly 2 and the top cover 13) can be further reduced, the glue can be evenly distributed, and the potting effect can be improved.

[0072] Alternatively, as Figure 3 As shown, the height of the highest point on the top surface of the second glue potting portion 32 is L2, and the height of the top surface of the battery cell 21 is H2, where 1 / 2H2≤L2≤H2. With this arrangement, a fourth gap 10 can be formed between the second glue potting portion 32 and the top cover 13 of the housing 1. The second glue potting portion 32 serves to secure the module, while the fourth gap 10 facilitates subsequent assembly operations such as wiring harness and connector bar insertion. Limiting the size of the fourth gap 10L2 to within the range of 1 / 2H2≤L2≤H2 reserves sufficient space for subsequent operations, thereby reducing operational difficulties caused by a limited operating space and improving the yield rate of the battery pack 100.

[0073] Optionally, the fourth gap 10 may also be connected to the outside of the battery pack 100 and to the gas channel of the air guide 5, so that the air guide 5 can extract the gas and discharge it from the battery pack 100 through the first gap 4 and the fourth gap 10, thereby improving the exhaust efficiency.

[0074] To improve the exhaust efficiency, the housing 1 can be provided with an explosion-proof valve, the first gap 4 is communicated with the explosion-proof valve, so as to exhaust the gas in the first gap 4 to the outside of the battery pack 100. By exhausting the gas in the first gap 4 to the outside of the battery pack 100 through the explosion-proof valve, the contact area between the glue-filling structure 3 and the top cover 13 of the housing 1 can be further improved, the bonding and glue-filling effect can be improved, and the overall mechanical performance of the battery pack 100 can be improved.

[0075] Optionally, as shown in Figure 2 , Figure 3 The glue-filling structure further includes a third glue-filling part 33, the upper side of the battery assembly 2 is bonded to the top cover 13 of the shell 14 through the third glue-filling part 33, and the lower side of the battery assembly 2 is bonded to the inner bottom wall of the shell 14 through the structural glue. The third glue-filling part 33 can bond and connect the housing 1, the battery assembly 2 and the shell 14 of the housing 1, so as to ensure the connection between the housing 1 and the battery assembly 2 and ensure the overall structural strength and rigidity of the battery pack 100.

[0076] To improve the bonding effect, optionally, as shown in Figure 2 , Figure 3 and Figure 6 The battery assembly 2 includes a battery module 22 and a busbar assembly 23 located above the battery module 22, the busbar assembly 23 has a second gap 7 with the top cover 13 of the housing 1, and the busbar assembly 23 has a third gap 8 with the battery module 22. The third glue-filling part 33 includes a part located in the second gap 7 and a part located in the third gap 8. The third glue-filling part 33 is arranged between the second gap 7 and the third gap 8, so as to bond the battery module 22 and the busbar assembly 23 to the top cover 13 of the housing 1 through the third glue-filling part 33, thereby realizing the bonding and connection of the gap between the battery cells 21 of the battery module 22 and the large-area area inside the top cover 13 of the battery pack 100, strengthening the connection effect of the top cover 13 of the housing 1 and the battery assembly 2, and improving the overall mechanical performance of the battery pack 100.

[0077] The specific type of the glue-filling structure 3 is not limited in the present disclosure, in an embodiment provided by the present disclosure, the glue-filling structure 3 is formed by foaming glue or non-foaming glue filled in the filling cavity 12.

[0078] As the foaming glue is generally a liquid glue liquid when injected into the cavity and before the foaming glue is cured, and the air in the containing cavity 11 occupies a certain space during the curing process of the foaming glue, the present disclosure sets the first gap 4, so that the air in the containing cavity 11 can be guided into the first gap 4 as the glue filling structure 3 increases in volume, and then discharged to the outside of the battery pack 100 through the first gap 4. Reduce the problem of insufficient bonding area between the glue filling structure 3 and the top cover 13 of the shell 1 due to the inability of the gas to be discharged to occupy the space of the containing cavity 11, thereby improving the structural strength of the battery pack 100. It can make the glue filling structure 3 and the top cover 13 of the shell 1 form a larger bonding area, so that the glue filling structure 3 and the top cover 13 form a stable connection, and improve the reliability of the whole battery pack 100.

[0079] In addition, since the foaming glue has high viscosity and can expand and solidify after being filled, it can achieve saturated filling and filling of each gap area in the battery pack 100, improve the filling effect, and help improve the structural strength of the whole battery pack 100. In other embodiments, foaming glue and non-foaming glue can also be used in combination for different areas and filling requirements. In this way, the present disclosure differentiates the design of the remaining space in the battery pack 100 through the above technical solutions-full filling, half filling / local filling, and reasonable selection of foaming glue and non-foaming structure glue, and also uses air guiding foam and glue blocking foam to optimize the filling scheme of the battery pack 100.

[0080] The present disclosure does not specifically limit such deformation methods, and those skilled in the art can adaptively design according to actual application requirements.

[0081] As a second aspect of the present disclosure, the present disclosure also provides a power utilization device comprising the above-mentioned battery pack 100.

[0082] Optionally, the power utilization device can be a vehicle. The vehicle can be a new energy vehicle, which can be a pure electric vehicle, a hybrid vehicle, or a range extended vehicle, etc., and the present disclosure does not specifically limit it.

[0083] Of course, in other application scenarios, the above-mentioned power utilization device can also be a vehicle that needs to be powered by the battery pack 100, such as a ship or an airplane, etc.

[0084] The preferred embodiments of the present disclosure are described in detail above in combination with the drawings, but the present disclosure is not limited to the specific details in the above-mentioned embodiments. Within the technical concept of the present disclosure, various simple modifications can be made to the technical solutions of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.

[0085] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0086] In addition, the various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims

1. A battery pack, characterized in that: Including shell, battery components and glue filling structure; A receiving cavity is formed in the housing, the battery assembly is disposed in the receiving cavity, and a filling cavity is provided between a side wall of the battery assembly and at least a portion of a side wall of the housing; The glue filling structure includes a first glue filling part, which is arranged in the filling cavity. In the height direction of the battery pack, there is a first gap between the top surface of the first glue filling part and the top cover of the outer shell. The first gap is used as an exhaust channel, and the exhaust channel is used to discharge the gas in the accommodating cavity to the outside of the battery pack.

2. The battery pack according to claim 1, wherein: The battery pack further includes an air guide member arranged on the top side of the battery assembly, and a gas channel of the air guide member is adapted to communicate with the first gap to guide the gas in the accommodating cavity to the first gap.

3. The battery pack according to claim 2, wherein: The surface of the air guide is provided with air holes, and the air holes are configured as air channels or configured to communicate with the air channels inside the air guide.

4. The battery pack according to claim 3, wherein: The air guide member includes a foam member, and a plurality of air holes are provided on the foam member, and the air holes are configured as the gas channels.

5. The battery pack according to claim 2, wherein: There are multiple air guides, and the multiple air guides include multiple first air guides and multiple second air guides; Each of the first air guides extends along the first direction, and a plurality of the first air guides are arranged at intervals along the second direction; The second air guide extends along the second direction, a plurality of the second air guides are arranged at intervals along the first direction, and the first direction intersects the second direction; The plurality of first air guides and the plurality of second air guides are arranged alternately.

6. The battery pack according to claim 5, characterized in that: The two first air guides located outermost in the second direction and the two second air guides located outermost in the first direction form an annular frame, and the annular frame defines a glue filling area located on the top side of the battery assembly.

7. The battery pack according to claim 1, wherein: The filling cavity includes a first cavity located at at least one end of the battery assembly along a first direction, the first glue-filling portion includes a first side portion, the first side portion is located in the first cavity, and in the height direction of the battery pack, there is the first gap between the top surface of the first side portion and the top cover of the outer shell.

8. The battery pack according to claim 7, characterized in that: The dimension of the accommodating cavity in the height direction of the battery pack is H1, and the height of the highest point or the lowest point of the top surface of the first side portion relative to the bottom surface of the accommodating cavity is L1, where L1≥H1*1 / 3.

9. The battery pack according to claim 7, characterized in that: The first direction is adapted to be the same as the width direction of the vehicle.

10. The battery pack according to claim 7, characterized in that: The battery assembly includes a battery cell, and the bottom surface of the battery cell is arranged on the bottom surface of the accommodating cavity; In the height direction of the battery pack, the highest point of the top surface of the first side portion is lower than the top surface of the battery cell, or the highest point of the top surface of the first side portion is flush with the top surface of the battery cell.

11. The battery pack according to claim 10, characterized in that: The height of the highest point of the top surface of the first side portion is L1, and the height of the top surface of the battery unit is H2, wherein 3 / 4H2≤L1≤H2.

12. The battery pack according to any one of claims 1 to 11, characterized in that: The filling cavity includes a second cavity located at at least one end of the battery assembly along a second direction, and the glue pouring structure includes a second glue pouring portion, and the second glue pouring portion is located in the second cavity.

13. The battery pack according to claim 12, wherein: The second direction is adapted to be the same as the longitudinal direction of the vehicle.

14. The battery pack according to claim 12, wherein: The battery assembly includes a battery cell, and the bottom surface of the battery cell is arranged on the bottom surface of the accommodating cavity; In the height direction of the battery pack, the highest point of the top surface of the second glue filling part is located below the top surface of the battery cell, or the highest point of the top surface of the second glue filling part is flush with the top surface of the battery cell.

15. The battery pack according to claim 14, characterized in that: The height of the highest point of the top surface of the second glue-filling portion is L2, and the height of the top surface of the battery unit is H2, wherein 1 / 2H2≤L2≤H2.

16. The battery pack according to any one of claims 1 to 11, characterized in that: The housing is provided with an explosion-proof valve, and the first gap is communicated with the explosion-proof valve to discharge gas in the first gap to the outside of the battery pack.

17. The battery pack according to any one of claims 1 to 11, characterized in that: The battery assembly includes a battery module and a busbar assembly located above the battery module, a second gap is defined between the busbar assembly and the top cover of the housing, and a third gap is defined between the busbar assembly and the battery module; The glue filling structure also includes a third glue filling part, which includes a part located in the second gap and a part located in the third gap. The upper side of the battery assembly is bonded to the top cover of the outer shell through the third glue filling part; or, the lower side of the battery assembly is bonded to the inner bottom wall of the outer shell through structural glue.

18. An electrical device, characterized in that: A battery pack comprising any one of claims 1 to 17.

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