Battery pack, assembling method thereof, and electric device

Abstract

This disclosure relates to a battery pack and its assembly method, as well as an electrical device. The battery pack includes a battery module, a housing, a potting structure, and a venting component. The housing has a receiving cavity, and the battery module is disposed within the receiving cavity. A filling cavity exists between the battery module and at least a portion of the sidewall of the housing. The potting structure includes a first potting portion disposed within the filling cavity, with a gap between the top surface of the first potting portion and the top surface of the filling cavity. The venting component includes a first venting component disposed within the gap, used to store gas and / or to guide gas from within the battery pack to the outside of the battery pack. This design reduces the likelihood of "air trapping" within the receiving cavity, and allows for reliable bonding between the battery module and the housing via the potting structure, with a large bonding area, which improves the strength and rigidity of the battery pack.

Description

Technical Field

[0001] This disclosure relates to the field of battery pack technology, specifically to a battery pack and its assembly method, and an electrical device. Background Technology

[0002] A battery pack is a device used to provide energy to electrical equipment (such as vehicles). It 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 structure and the inner side of the battery pack, which is not conducive to improving the strength and rigidity of the battery pack. Summary of the Invention

[0003] This disclosure provides a battery pack and its assembly method, as well as an electrical device, to at least partially overcome the problems existing in the related art.

[0004] To achieve the above objectives, according to a first aspect of this disclosure, a battery pack is provided, comprising: Battery module; The housing has a receiving cavity, the battery module is disposed in the receiving cavity, and there is a filling cavity between the battery module and at least a portion of the side wall of the housing; A potting structure includes a first potting portion disposed within the filling cavity, wherein a gap exists between the top surface of the first potting portion and the top surface of the receiving cavity; and A gas guide includes a first gas guide disposed in the gap, the first gas guide being used to store gas and / or to guide gas in the battery pack to the outside of the battery pack.

[0005] Optionally, the height of the top surface of the first air guide is higher than the height of the top surface of the battery module; and / or, The bottom surface of the first air guide is lower than the top surface of the battery module.

[0006] Optionally, the housing includes a lower shell and an upper cover, the upper cover being connected to a connecting surface located at the upper end of the lower shell; The height of the top surface of the first air guide is higher than the height of the connecting surface, and part of the inner wall of the upper cover is constructed as the top surface of the receiving cavity.

[0007] Optionally, the first air guide is configured as a compressible component, and the first air guide is compressed in the height direction of the battery pack and abuts between the upper cover and the first potting part.

[0008] Optionally, the housing is provided with an exhaust port, which is used to communicate with the exhaust channel of the first air guide.

[0009] Optionally, the enclosure includes a base plate and a frame disposed on the base plate; The gap is located between the frame and the battery module, and the vent is provided on the frame.

[0010] Optionally, the distance between the top surface of the first glue-filling part and the top surface of the receiving cavity is 5mm to 10mm.

[0011] Optionally, the first air guide is bonded to the top surface of the first glue-filling part, or the first air guide is bonded to the inner wall of the upper cover of the box.

[0012] Optionally, the lower end of the first air guide abuts against the top surface of the first glue-filling part.

[0013] Optionally, the battery pack further includes a second potting section and a second air guide; The second potting section and the second air guide are both disposed between the top surface of the battery module and the top cover of the housing; The second gas guide is connected to the first gas guide so that the gas passage of the second gas guide can communicate with the gas passage of the first gas guide.

[0014] Optionally, there are multiple second air guides, and the multiple second air guides are arranged at intervals between the top surface of the battery module and the top cover; The plurality of second dispensing sections include a plurality of sub-dispensing sections, and the sub-dispensing sections are disposed between two adjacent second air guides.

[0015] Optionally, the sum of the areas of the projections of the plurality of sub-potting portions along the height direction of the battery pack is A1, and the area of ​​the projection of the top surface of the battery module along the height direction of the battery pack is A2, wherein A1 and A2 satisfy: A1≥0.9A2.

[0016] Optionally, a plurality of the second air guides are spaced apart in the first direction; The gap includes two first gaps, which are arranged on both sides of the battery pack in the second direction; The first air guide is arranged in both of the first gaps, and the sub-pouring part is also provided between the first air guide and the second air guide in the first direction; Multiple second air guides are located at both ends of the second direction and are connected to the first air guide, and the first direction intersects the second direction.

[0017] Optionally, the gap further includes two second gaps, which are arranged on both sides of the battery pack in the first direction; The first air guide is provided in both of the second gaps.

[0018] Optionally, the two first gaps and the two second gaps are connected to form an annular gap; The first air guide is an annular component, or the first air guide is formed by splicing together multiple first sub-air guides.

[0019] Optionally, the second air guide is adhered to the top surface of the battery module, or the second air guide is adhered to the inner wall of the upper cover of the housing.

[0020] Optionally, the gas guide is provided with a gas channel; The gas passage is used for gas to flow through, and / or the gas passage is used for gas storage.

[0021] Optionally, the air guide is a foam component, and the foam component is provided with a plurality of air holes, the air holes being configured as the gas channels.

[0022] Optionally, the open area ratio of the foam component is ≥85%.

[0023] According to a second aspect of this disclosure, an electrical device is provided, including a battery pack as described above.

[0024] According to a third aspect of this disclosure, a method for assembling a battery pack is provided, the method comprising: The system provides a battery module, adhesive, a first air guide component, and a housing, wherein the housing has a receiving cavity. The battery module is installed in the receiving cavity, and a filling cavity is formed between the battery module and at least a portion of the side wall of the housing; Glue is poured into the filling cavity to form a first glue-filled portion within the filling cavity; The first gas guide is arranged in the gap between the top surface of the first potting part and the top surface of the receiving cavity. The first gas guide is used to store gas and / or to guide the gas in the battery pack to the outside of the battery pack.

[0025] Optionally, the housing includes a lower shell and an upper cover, the upper cover serving to define the receiving cavity together with the lower shell. The step of arranging the first air guide in the gap between the top surface of the first glue-filling part and the top surface of the receiving cavity includes: First, the first air guide is placed on the top surface of the first glue-filling part, and then the upper cover is connected to the lower housing, wherein a portion of the inner wall of the upper cover is configured as the top surface of the receiving cavity; or, First, the first air guide is placed on the inner wall of the top surface of the upper cover, which is constructed as the receiving cavity, and then the upper cover is connected to the lower housing.

[0026] Optionally, the method further includes: Provide a second air guide; The second gas guide is arranged in the gap between the top surface of the battery module and the top surface of the receiving cavity, and the gas channel of the second gas guide is connected to the gas channel of the first gas guide. Glue is poured into the gap between the top surface of the battery module and the top surface of the receiving cavity to form a second glue-filled section.

[0027] Optionally, the housing further includes an upper cover and a lower shell, the upper cover and the lower shell together defining the receiving cavity. The step of arranging the second air guide within the gap between the top surface of the battery module and the top surface of the receiving cavity includes: First, the second air guide is placed on the top surface of the battery module, and then the upper cover is connected to the lower housing, with a portion of the inner wall of the upper cover forming the top surface of the receiving cavity; or, First, the second air guide is placed on the inner wall of the top surface of the upper cover, which is constructed as the receiving cavity, and then the upper cover is connected to the lower housing.

[0028] Optionally, there may be multiple second air guides, which are arranged at intervals along a first direction between the top surface of the battery module and the top surface of the receiving cavity. The process of filling the gap between the top surface of the battery module and the top surface of the receiving cavity with adhesive includes: Fill the gap between each pair of adjacent second air guides with adhesive; Apply adhesive to the gap between the first air guide and the second air guide located in the first direction.

[0029] With the above technical solution, since the first air guide is located in the gap between the top surface of the first potting section and the top surface of the filling cavity, and the first air guide is used to store gas and / or to guide gas in the battery pack to the outside of the battery pack, during the potting process, the air in the receiving cavity can be stored inside the first air guide or discharged to the outside of the battery pack through the first air guide. This makes it less likely for "air trapping" to occur in the receiving cavity, which is beneficial for the reliable bonding between the battery module and the casing through the potting structure, and the bonding area is large, which helps to improve the strength and rigidity of the battery pack.

[0030] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure. Attached Figure Description

[0031] The accompanying drawings, which are incorporated in and form a part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure.

[0032] Figure 1 This is a top view schematic diagram of a battery pack provided in an exemplary embodiment of the present disclosure, wherein the top cover is not shown.

[0033] Figure 2 yes Figure 1 A magnified view of A in the middle.

[0034] Figure 3 This is a cross-sectional schematic diagram of a battery pack provided in an exemplary embodiment of this disclosure.

[0035] Figure 4 yes Figure 3 A magnified view of B in the middle.

[0036] Figure 5 This is a schematic flowchart of a battery pack assembly method provided in an exemplary embodiment of this disclosure.

[0037] Explanation of reference numerals in the attached figures 100-Battery pack; 1-Battery module; 2-Box; 21-Receiving cavity; 22-Side wall; 23-Lower shell; 231-Connecting surface; 232-Base plate; 233-Frame; 24-Top cover; 3-Potting structure; 31-First potting part; 4-Air guide; 41-First air guide; 42-Second air guide; 5-Filling cavity; 6-Gap; 61-First gap; 62-Second gap. Detailed Implementation

[0038] The specific embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit this disclosure.

[0039] In this disclosure, unless otherwise stated, directional terms such as "up," "down," "left," "right," "first direction," and "second direction," indicating orientation or positional relationships, are defined based on the drawing orientations shown in the accompanying drawings. They are used solely for ease of description and simplification, and do not indicate or imply that the device or element referred to must have a specific orientation, or a specific orientational construction and operation. Therefore, they should not be construed as limitations on this disclosure. The terms "inner" and "outer" refer to the inner and outer contours of the corresponding structures. For example, "first direction" could be the width direction of the battery pack, and "second direction" could be the length direction of the battery pack; see references for details. Figure 1 and Figure 4 As shown, this disclosure does not limit this.

[0040] Additionally, it should be noted that the terms used, such as "first" and "second," are used to distinguish one element from another and do not indicate sequence or importance. Furthermore, in the description with reference to the accompanying drawings, the same reference numerals in different drawings denote the same element.

[0041] In the description of this disclosure, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "connect," "link," and "install" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this disclosure according to the specific circumstances.

[0042] The inventors discovered that the main purpose of injecting the potting structure into the battery pack in the relevant technology is to achieve strong bonding between the internal components of the battery pack and large structural components such as the casing and top cover through filling, fixing and bonding, thereby realizing the integration and structuring of the battery pack; at the same time, it can also improve the temperature consistency of the entire pack's thermal management, block high temperatures when thermal runaway occurs, and upgrade the insulation capability when strong electrical connections are made.

[0043] During the process of potting the internal structure of the battery pack, if the air in the filling cavity cannot be expelled in time, it can easily lead to gas accumulation at the bonding interface between the battery pack casing and the potting structure, resulting in an abnormal air trapping. If the potting structure cannot fill the trapped air area, a gap space will be formed inside the potting structure. This abnormal air trapping is particularly serious in the case of top cover bonding, causing the actual bonding area between the potting structure 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 rigidity and strength of the battery pack.

[0044] In view of this, such as Figures 1 to 4 As shown, according to a first aspect of this disclosure, a battery pack 100 is provided, including a battery module 1, a housing 2, a potting structure 3, and a gas guide 4. The housing 2 has a receiving cavity 21, and the battery module 1 is disposed in the receiving cavity 21. A filling cavity 5 is provided between the battery module 1 and at least a portion of the sidewall 22 of the housing 2, such as the gap between the frame 233 of the housing 2 and the battery module 1 mentioned below. The potting structure 3 includes a first potting portion 31 disposed in the filling cavity 5, and a gap 6 is provided between the top surface of the first potting portion 31 and the top surface of the filling cavity 5. The gas guide 4 includes a first gas guide 41 disposed in the gap 6. The first gas guide 41 is used to store gas and / or to guide gas in the battery pack 100 to the outside of the battery pack 100.

[0045] When the aforementioned battery pack 100 is applied to an electrical device, the battery module 1 installed in the battery pack 100 can supply power to the electrical device, thereby driving the main body of the device to operate. For example, the battery pack 100 can be a vehicle battery pack 100.

[0046] In the aforementioned battery pack 100, a filling cavity 5 is provided between the battery module 1 and at least a portion of the side wall 22 of the housing 2, and a first potting section 31 is provided within the filling cavity 5. Thus, the battery module 1 is connected to the side wall 22 of the housing 2 through the first potting section 31. In this way, on the one hand, the cured adhesive can provide support for the battery module 1, resulting in better fixation of the battery module 1 within the housing 2 and reducing its tendency to shake; on the other hand, the battery pack 100 provided in this disclosure, by connecting the battery module 1 to the side wall 22 of the housing 2 through the first potting section 31, allows the battery module 1, the first potting section 31, and the side wall 22 of the housing 2 to cooperate in forming a force transmission path, thereby jointly transmitting the force acting on the battery pack 100, improving the overall rigidity, strength, and modal characteristics of the battery pack 100, and resulting in higher safety and durability of the battery pack 100.

[0047] Furthermore, because the adhesive has fluidity, by injecting a preset amount of adhesive into the filling cavity 5, the adhesive can be filled into the filling cavity 5 according to the preset filling height, which helps to overcome the manufacturing and assembly errors of the various components of the battery pack 100.

[0048] Through the above technical solution, since the first air guide 41 is disposed in the gap 6 between the top surface of the first potting section 31 and the top surface of the filling cavity 5, and the first air guide 41 is used to store gas and / or to guide the gas in the battery pack 100 to the outside of the battery pack 100. In this way, during the potting process of the battery pack 100, the air in the receiving cavity 21 can be guided to the first air guide 41 as the volume of the potting structure 3 increases, and can be stored inside the first air guide 41 or discharged to the outside of the battery pack 100 under the action of the first air guide 41. This prevents the gas in the receiving cavity 21 from occupying other spaces in the battery pack 100 (such as the filling cavity 5), making it less likely for "air trapping" to occur in the receiving cavity 21. This is beneficial for the reliable bonding between the battery module 1 and the housing 2 through the potting structure 3, and the bonding area is large, which is beneficial for improving the strength and rigidity of the battery pack 100.

[0049] The aforementioned "trapped gas" phenomenon refers to the phenomenon that, during the potting process, gas accumulates at the bonding interface between the battery pack 100 housing 2 and the potting structure 3. The trapped gas area forms a gap space inside the potting structure 3, resulting in the actual bonding area between the battery module 1 and the housing 2 being lower than the preset value.

[0050] It should be noted here that this disclosure does not limit the specific dimensions of the first air guide 41. As one embodiment of this disclosure, such as... Figure 4 As shown, the height of the top surface of the first air guide 41 is higher than the height of the top surface of the battery module 1, and / or the height of the bottom surface of the first air guide 41 is lower than the height of the top surface of the battery module 1.

[0051] Because the top surface of the first air guide 41 is higher than the top surface of the battery module 1, it can effectively block the adhesive during the potting process, thus preventing the adhesive from overflowing into the casing 2 of the battery pack 100. For example, it can effectively prevent the adhesive from overflowing to the connection surface 231 between the lower housing 23 and the upper cover 24 of the battery pack 100, thereby preventing the seal between the lower housing 23 and the upper cover 24 from being affected.

[0052] The bottom surface of the first air guide 41 is lower than the top surface of the battery module 1, which means that the mounting groove for arranging the first air guide 41 is defined between the side wall 22 of the housing, the top surface of the first potting part 31 and the side wall of the battery module 1, so as to facilitate the arrangement of the first air guide 41.

[0053] In addition, by reasonably designing the size of the first air guide 41, the first air guide 41 can have a certain height. The first air guide 41 with a certain height has a larger volume. The first air guide 41 with a larger volume can store more gas and / or has a stronger air guiding capacity, which can further avoid the occurrence of "air trapping" phenomenon in the battery pack 100.

[0054] It is understood that in this disclosure, the battery module 1 may include a plurality of stacked battery cells, and in embodiments where the battery module 1 includes a plurality of battery cells, the top surface of the battery module 1 refers to the top surface of the battery cells.

[0055] This disclosure does not limit the specific structure of the battery pack 100; alternatively, such as... Figures 1 to 4 As shown, the housing 2 includes a lower housing 23 and an upper cover 24. The upper cover 24 is connected to the connecting surface 231 located at the upper end of the lower housing 23. The height of the top surface of the first air guide 41 is higher than the height of the connecting surface 231. Part of the inner wall of the upper cover 24 is constructed as the top surface of the filling cavity 5. Since the height of the top surface of the first air guide 41 is higher than the height of the connecting surface 231 connecting the upper cover 24 and the lower housing 23, the first air guide 41 can block the glue during the glue pouring process, effectively preventing the glue from overflowing to the connecting surface 231 between the lower housing 23 and the upper cover 24 of the battery pack 100, thus avoiding the situation where the seal between the lower housing 23 and the upper cover 24 is affected.

[0056] This disclosure does not limit the sealing method between the lower housing 23 and the upper cover, as long as it meets the sealing requirements of the battery pack 100. As one embodiment of this disclosure, the connecting surfaces between the lower housing 23 and the upper cover 24 can be connected by sealant. The lower housing 23 and the upper cover 24 connected by sealant provide a reliable seal and can meet the sealing requirements of the battery pack 100.

[0057] As another embodiment of this disclosure, a sealing strip may also be provided at the connection surface between the lower housing 23 and the upper cover 24. The lower housing 23 and the upper cover 24, sealed by the sealing strip, are easier to assemble and disassemble, facilitating maintenance.

[0058] Optionally, the first air guide 41 is configured as a compressible component, and the first air guide 41 is compressed and abuts against the upper cover 24 and the first potting portion 31 in the height direction of the battery pack 100. The first air guide 41 being compressed and abutting against the upper cover 24 and the first potting portion 31 helps to ensure the reliability of the installation of the first air guide 41, and also helps to limit the foaming / flow of the adhesive as needed.

[0059] To facilitate the release of gas from inside the battery pack 100 to the outside, optionally, the housing 2 is provided with an exhaust port, which is connected to the exhaust channel of the first air guide 41. In this way, gas generated during the potting process can be discharged to the outside of the battery pack 100 through the first air guide 41 and the exhaust port on the housing 2, further preventing the "trapped gas" phenomenon inside the battery pack 100.

[0060] It should be noted that this disclosure does not limit the specific location of the exhaust port on the housing 2 of the battery pack 100, as long as the exhaust port facilitates the discharge of gas from the battery pack 100. In one embodiment of this disclosure, the housing 2 includes a base plate 232 and a frame 233 disposed on the base plate 232. A gap 6 is located between the frame 233 and the battery module 1, and an exhaust port is disposed on the frame 233. In other words, the exhaust port is located on the side of the housing 2, making it less likely to be blocked and facilitating gas discharge.

[0061] This disclosure does not limit the size of the first potting portion 31, as long as the first potting portion 31 can reliably bond the battery module 1 to the housing 2. As one embodiment of this disclosure, the distance between the top surface of the first potting portion 31 and the top surface of the receiving cavity 21 is 5mm to 10mm.

[0062] The distance between the top surface of the first potting section 31 and the top surface of the receiving cavity 21 is in the range of 5mm to 10mm, which allows for the filling of a larger volume of the first air guide 41, thereby enabling the storage of more gas or having a greater exhaust capacity, further avoiding the occurrence of "trapped gas" phenomenon in the battery pack 100.

[0063] Furthermore, within the aforementioned range, it is also beneficial to ensure that the first potting section 31 has a certain height within the filling cavity 5 between the side wall 22 of the housing 2 and the battery module 1. The contact area between the first potting section 31 and the side wall 22 and the battery module 1 is relatively large. The first potting section 31 with a certain height can provide a larger force transmission path between the battery module 1 and the side plate, thereby improving the strength and rigidity of the entire battery pack 100. This effectively avoids stress concentration at the bonding points between the first potting section 31 and the side wall 22 and / or the battery module 1 due to the small force transmission path between the battery module 1 and the side plate of the housing 2, which could easily lead to the first potting section 31 detaching.

[0064] It should be noted that this disclosure does not limit the specific installation position of the first air guide 41 within the battery pack 100. As one embodiment of this disclosure, the first air guide 41 can be bonded to the top surface of the first potting portion 31. The installation of the first air guide 41 bonded to the top surface of the first potting portion 31 within the battery pack 100 is relatively simple and helps improve the assembly efficiency of the battery pack 100.

[0065] As another embodiment of this disclosure, the first air guide 41 can also be adhered to the inner wall of the upper cover 24 of the housing 2.

[0066] Thus, on the one hand, the first air guide 41 installed on the top cover 24 of the housing 2 is not easily in contact with the glue during the glue pouring process, effectively avoiding the situation where the glue adheres to the first air guide 41 and affects the normal use of the first air guide 41; on the other hand, the first air guide 41 installed on the top cover 24 of the housing 2 is not affected by the glue pouring scheme, and the installation of the first air guide 41 can be achieved without waiting for the glue to cure, which has high versatility.

[0067] In the battery pack 100 provided in this disclosure, the first air guide 41 may have a gap with the first potting portion 31, and the first air guide 41 may also abut against the first potting portion 31; this disclosure does not limit this. As one embodiment of this disclosure, the lower end of the first air guide 41 may also abut against the top surface of the first potting portion 31. Since the lower end of the first air guide 41 abuts against the top surface of the first potting portion 31, when the adhesive in the first potting portion 31 is poured into the filling cavity 5, the first air guide 41 can be used to restrict the foaming and flow of the adhesive, thereby allowing the adhesive in the first potting portion 31 to be formed according to a preset shape and preset size, thus meeting the usage requirements of the battery pack 100.

[0068] To further improve the strength of the battery pack 100, optionally, such as Figure 3 and Figure 4 As shown, the battery pack 100 may further include a second potting section and a second air guide 42. Both the second potting section and the second air guide 42 are disposed between the top surface of the battery module 1 and the upper cover 24 of the housing 2. The second air guide 42 is connected to the first air guide 41, allowing the gas passage of the second air guide 42 to communicate with the gas passage of the first air guide 41. In other words, the top surface of the battery module 1 is also connected to the upper cover 24 of the housing 2 via the second potting section, resulting in a larger bonding area between the battery module 1 and the housing 2, and thus higher strength and rigidity of the battery pack 100.

[0069] Furthermore, since a second air guide 42 is provided between the top surface of the battery module 1 and the top cover 24 of the housing 2, and the second air guide 42 is connected to the first air guide 41, gas can flow to the second air guide 42 and the first air guide 41 during the glue filling process of the second glue filling section. The second air guide 42 and the first air guide 41 can store gas and / or discharge gas to the outside of the battery pack 100, effectively avoiding the "air trapping" phenomenon caused by the arrangement of the second glue filling section.

[0070] To improve the air retention and / or air conduction effect of the second air guide 42, optionally, the number of the second air guide 42 is multiple, and the multiple second air guides 42 are arranged at intervals between the top surface of the battery module 1 and the top cover 24. The multiple second potting portions include multiple sub-potting portions, and a sub-potting portion is provided between two adjacent second air guides 42. By dividing the second potting portion into multiple sub-potting portions with smaller cross-sectional areas, and providing multiple second air guides 42 at intervals between the multiple sub-potting portions, the air conduction and / or air venting effect of the second air guides 42 can be improved, further avoiding the occurrence of "air trapping" phenomenon in the battery pack 100.

[0071] To improve the overall strength and rigidity of the battery pack 100, optionally, the sum of the projected areas of multiple sub-potting portions along the height direction of the battery pack 100 is A1, and the projected area of ​​the top surface of the battery module 1 along the height direction of the battery pack 100 is A2, where A1 and A2 satisfy: A1 ≥ 0.9A2. Multiple sub-potting portions with larger areas can increase the bonding area between the battery module 1 and the top cover 24 of the battery pack 100, thereby contributing to improved strength and rigidity of the battery pack 100.

[0072] It should be noted that in the battery pack 100 provided in this disclosure, the first air guide 41 and the plurality of second air guides 42 can be arranged in any appropriate direction, as long as the first air guide 41 and the plurality of second air guides 42 cooperate with each other to avoid the phenomenon of "air trapping" in the battery pack 100. As one embodiment of this disclosure, the plurality of second air guides 42 are spaced apart in the first direction, and the gap 6 includes two first gaps 61. The two first gaps 61 are arranged on both sides of the battery pack 100 in the second direction, and the first air guide 41 is arranged in each of the two first gaps 61. In the first direction, a sub-filling part is also provided between the first air guide 41 and the second air guide 42. The two ends of the plurality of second air guides 42 in the first direction are connected to the first air guide 41, and the first direction intersects the second direction.

[0073] Thus, the first air guide 41 located in the two first gaps 61 on both sides of the housing 2 in the second direction can cooperate with the multiple second air guides 42 to store and / or export the gas generated during the potting process, thereby avoiding the phenomenon of "trapped gas" in the battery pack 100.

[0074] Optionally, such as Figure 1 As shown, the gap 6 also includes two second gaps 62, which are arranged on both sides of the battery pack 100 in the first direction. Each of the two second gaps 62 contains a first air guide 41. Since the gap 6 includes two first gaps 61 along both sides of the battery pack 100 in the second direction, and two second gaps 62 arranged on both sides of the battery pack 100 in the first direction, it means that the battery module 1 inside the battery pack 100 is surrounded by gaps 6, and each gap 6 contains a first air guide 41. The first air guide 41 is relatively long, allowing it to have a larger volume and the ability to store more gas, and / or have a greater exhaust capacity, which helps to further prevent the "trapped gas" phenomenon.

[0075] In this disclosure, the first air guide 41 can have any suitable structure. For example, the first air guide 41 can be composed of multiple structures spliced ​​together, or the first air guide 41 can be integrally formed. This disclosure does not limit this. As one embodiment of this disclosure, the two first gaps 61 and the two second gaps 62 are connected to form an annular gap 6, and the first air guide 41 is an annular member. In other words, the first air guide 41 is an integrally formed annular member. The integrally formed first air guide 41 has higher strength and better aesthetics.

[0076] In another embodiment of this disclosure, the first air guide 41 is also assembled from multiple first sub-air guides 4. The first air guide 41 assembled from multiple first sub-air guides 4 adopts a modular design, which is highly flexible and easy to assemble.

[0077] It should be noted that this disclosure does not limit the specific installation position of the second air guide 42 within the battery pack 100. In one embodiment of this disclosure, the second air guide 42 is adhered to the top surface of the battery module 1. The installation of the second air guide 42, adhered to the top surface of the battery module 1, within the battery pack 100 is relatively simple and helps improve the assembly efficiency of the battery pack 100.

[0078] As another embodiment of this disclosure, the second air guide 42 can also be adhered to the inner wall of the top cover 24 of the housing 2.

[0079] Thus, on the one hand, the second air guide 42 installed on the top cover 24 of the housing 2 is not easily in contact with the glue during the glue pouring process, effectively avoiding the situation where the glue adheres to the second air guide 42 and affects the normal use of the second air guide 42; on the other hand, the second air guide 42 installed on the top cover 24 of the housing 2 is not affected by the glue pouring scheme, and the installation of the second air guide 42 can be achieved without waiting for the glue to cure, which has high versatility.

[0080] It should be noted that this disclosure does not limit the specific structure of the gas guide 4 (such as the first gas guide 41 and the second gas guide 42 mentioned above). In order for the gas guide 4 to store gas or to discharge gas, optionally, the gas guide 4 is provided with a gas channel for gas to flow through, and / or for storing gas. In this way, when gas flows into the gas channel, the gas channel can play the role of storing and / or discharging gas, thereby avoiding the phenomenon of "trapped gas" in the battery pack 100.

[0081] Here, it can be understood that the aforementioned air guide 4 may refer to one of the first air guide 41 and the second air guide 42, or it may refer to both the first air guide 41 and the second air guide 42. This disclosure does not limit this.

[0082] This disclosure does not limit the specific type of the gas guide 4, as long as the gas guide 4 can store and / or release gas within the battery pack 100. In one embodiment of this disclosure, the gas guide 4 is a foam component with multiple air holes, the air holes forming gas channels. The foam component can store gas and allow gas to flow.

[0083] Furthermore, because the foam components are compressible and lightweight, they will not burden the battery pack when installed inside the battery pack 100. Also, because the foam components are compressible, they will not interfere with the top cover 24 of the housing 2 during installation, ensuring proper fastening and installation of the top cover 24.

[0084] It should be noted that this disclosure does not limit the specific materials of the foam components mentioned above. For example, it can be one of Si, PU, ​​EPDM (Ethylene Propylene Diene Monomer), CR (Chloroprene Rubber), EVA (Ethylene Vinyl Acetate Copolymer), and SBR (Polymerized Styrene Butadiene Rubber).

[0085] Optionally, the open area ratio of the foam component is ≥85%. Foam components with a higher open area ratio have more pores, thus they can store more air and have greater air circulation capacity.

[0086] Optionally, the density of the above-mentioned foam component is ≤200kg / m³. 3 Because the foam component has a low density, the weight of the air guide component 4 can be reduced while meeting the requirements of the battery pack 100. This helps to reduce the overall weight of the battery pack 100 and enables the battery pack 100 to have a higher energy density.

[0087] According to a second aspect of this disclosure, an electrical device is provided, including the battery pack 100 as described above.

[0088] This electrical device has all the beneficial effects of the aforementioned battery pack 100, which will not be elaborated here.

[0089] It should be noted that this disclosure does not limit the specific type of electrical equipment. The aforementioned electrical equipment may be a vehicle or other electrical equipment suitable for using the aforementioned battery pack, and this disclosure does not limit it in this regard.

[0090] According to the third aspect of this disclosure, such as Figure 5As shown, a method for assembling a battery pack is provided. This method can be used for assembling the battery pack 100 mentioned above. The method may include the following steps: S100: Provides battery module 1, adhesive, first air guide 41 and housing 2, housing 2 is provided with receiving cavity 21; S200: The battery module 1 is installed in the receiving cavity 21, and a filling cavity 5 is provided between the battery module 1 and at least part of the side wall 22 of the housing 2; S300: Fill the filling cavity 5 with glue to form a first glue filling part 31 in the filling cavity 5; S400: The first gas guide 41 is arranged in the gap 6 between the top surface of the first potting part 31 and the top wall of the receiving cavity 21. The first gas guide 41 is used to store gas and / or to guide the gas in the battery pack 100 to the outside of the battery pack 100.

[0091] As mentioned above, through the above technical solution, since the first air guide 41 is disposed in the gap 6 between the top surface of the first potting section 31 and the top surface of the filling cavity 5, and the first air guide 41 is used to store gas and / or to guide the gas in the battery pack 100 to the outside of the battery pack 100, the phenomenon of "air trapping" is less likely to occur. This is beneficial to ensure that the battery module 1 and the housing 2 can be reliably bonded through the potting structure 3, and the bonding area is large, which is beneficial to improving the strength and rigidity of the battery pack 100.

[0092] In an embodiment where the housing 2 includes a lower housing 23 and an upper cover 24, and the upper cover 24 is used to define the receiving cavity 21 together with the lower housing 23, in order to arrange the first air guide 41 in the gap 6 between the top surface of the first glue-filling part 31 and the top surface of the receiving cavity 21, as an embodiment of this disclosure, the above-described step S400 may include: First, the first air guide 41 is placed on the top surface of the first glue filling part 31, and then the upper cover 24 is connected to the lower housing 23. The inner wall of the upper cover 24 is constructed as the top surface of the receiving cavity 21.

[0093] In other words, the first air guide 41 can be fixed (e.g., glued) to the top surface of the first potting part 31. The installation of the first air guide 41 fixed to the top surface of the first potting part 31 in the battery pack 100 is simpler and helps to improve the assembly efficiency of the battery pack 100.

[0094] As another embodiment of this disclosure, step S400, which involves arranging the first air guide 41 within the gap 6 between the top surface of the first glue-filling portion 31 and the top wall of the receiving cavity 21, may include: First, the first air guide 41 is arranged (e.g., bonded) on the inner wall of the top surface of the upper cover 24, which is constructed as the receiving cavity 21, and then the upper cover 24 is connected to the lower housing 23.

[0095] Since the first air guide 41 is arranged on the top cover, on the one hand, the first air guide 41 on the top cover 24 of the housing 2 is not easily in contact with the glue during the glue pouring process, which effectively avoids the glue adhering to the first air guide 41 and affecting the normal use of the first air guide 41; on the other hand, the first air guide 41 on the top cover 24 of the housing 2 is not affected by the glue pouring scheme, and the installation of the first air guide 41 can be achieved without waiting for the glue to cure, which has high versatility.

[0096] To further improve the strength of the battery pack 100, the above-mentioned battery pack assembly method may optionally include: Provide a second air guide 42; The second gas guide 42 is arranged in the gap between the top surface of the battery module 1 and the top surface of the receiving cavity 21, and the gas channel of the second gas guide 42 is connected to the gas channel of the first gas guide 41. Glue is poured into the gap between the top surface of the battery module 1 and the top surface of the receiving cavity 21 to form a second glue-filled part.

[0097] In this way, the top surface of the battery module 1 can also be connected to the top cover 24 of the housing 2 through the second potting part, the bonding area between the battery module 1 and the housing 2 is large, and the strength and rigidity of the battery pack 100 are high.

[0098] Furthermore, since a second air guide 42 is provided between the top surface of the battery module 1 and the top cover 24 of the housing 2, and the second air guide 42 is connected to the first air guide 41, gas can flow to the second air guide 42 and the first air guide 41 during the glue filling process of the second glue filling section. The second air guide 42 and the first air guide 41 can store gas and / or discharge gas to the outside of the battery pack 100, effectively avoiding the "air trapping" phenomenon caused by the arrangement of the second glue filling section.

[0099] This disclosure does not limit the arrangement order of the second air guide 42 within the battery pack 100. For an embodiment where the housing 2 includes a lower shell 23 and an upper cover 24, and the upper cover 24, together with the lower shell 23, defines the receiving cavity 21, in order to arrange the second air guide 42, as one embodiment of this disclosure, the step of arranging the second air guide 42 within the gap between the top surface of the battery module 1 and the top surface of the receiving cavity 21 may include: First, the second air guide 42 is placed on the top surface of the battery module 1, and then the upper cover 24 is connected to the lower housing 23. Part of the inner wall of the upper cover 24 is constructed as the top surface of the receiving cavity 21.

[0100] In other words, the second air guide 42 can be fixed (e.g., glued) to the top surface of the battery module 1. The installation of the second air guide 42 fixed to the top surface of the second potting part inside the battery pack 100 is relatively simple and helps to improve the assembly efficiency of the battery pack 100.

[0101] As another embodiment of this disclosure, the step of arranging the second air guide 42 in the gap between the top surface of the battery module 1 and the top surface of the receiving cavity 21 may include: First, the second air guide 42 is arranged (e.g., bonded) on the inner wall of the top wall of the upper cover 24, which is constructed as the receiving cavity 21, and then the upper cover 24 is connected to the lower housing 23.

[0102] Since the second air guide 42 is arranged on the top cover, on the one hand, the second air guide 42 on the top cover 24 of the housing 2 is not easily in contact with the glue during the glue pouring process, which effectively avoids the glue adhering to the second air guide 42 and affecting the normal use of the second air guide 42; on the other hand, the second air guide 42 on the top cover 24 of the housing 2 is not affected by the glue pouring scheme, and the installation of the second air guide 42 can be achieved without waiting for the glue to cure, which has high versatility.

[0103] To improve the gas storage and / or gas guiding effect of the second gas guide 42, optionally, there are multiple second gas guides 42, which are arranged at intervals along the first direction between the top surface of the battery module 1 and the top surface of the receiving cavity 21.

[0104] By dividing the second potting portion into multiple sub-potting portions with smaller cross-sectional areas, and by providing multiple second air guides 42 at intervals between the multiple sub-potting portions, the air guiding and / or venting effect of the second air guides 42 can be improved, further preventing the occurrence of "trapped air" phenomenon in the battery pack 100.

[0105] In embodiments where there are multiple second air guides 42, the method for filling the gap between the top surface of the battery module 1 and the top surface of the receiving cavity 21 with adhesive may include: Fill the gap between each pair of adjacent second air guides 42 with adhesive; Apply adhesive to the gap between the first air guide 41 and the second air guide 42 located in the first direction.

[0106] In this way, the adhesive can flow into the gap between the multiple second air guides 42, and also into the gap between the first air guide 41 and the second air guide 42, thereby connecting the top cover 24 of the housing 2 to the top surface of the battery module 1, resulting in high strength and rigidity of the battery pack 100.

[0107] It should be noted that, in this disclosure, the first air guide 41 and the second air guide 42 can be arranged in various ways, and this disclosure does not limit them.

[0108] In a first embodiment of this disclosure, the first air guide 41 can be arranged within the gap 6, and the second air guide 42 can be directly arranged on the top surface of the battery module 1 before the battery pack 100 is potted. The first air guide 41 and the second air guide 42 can guide the adhesive during the potting process, facilitating potting.

[0109] In a second embodiment of this disclosure, the first air guide 41 can be arranged within the gap 6, and the second air guide 42 can be arranged on the upper cover 24. Thus, during the glue-pouring process, the glue is less likely to come into contact with the second air guide 42, thereby ensuring the air-guiding effect of the second air guide 42.

[0110] As a third embodiment of this disclosure, the first air guide 41 and the second air guide 42 can both be arranged on the upper cover 24. In this way, during the glue pouring process, the first air guide 41 and the second air guide 42 are not likely to come into contact with the glue, thereby ensuring the air guiding effect of the first air guide 41 and the second air guide 42.

[0111] As a fourth embodiment of this disclosure, the first air guide 41 can be arranged on the top cover 24, and the second air guide 42 can be on the top surface of the battery module 1. In this way, during the potting process, the adhesive is less likely to come into contact with the first air guide 41, thereby ensuring the air guiding effect of the first air guide 41.

[0112] The preferred embodiments of this disclosure have been described in detail above with reference to the accompanying drawings. However, this disclosure is not limited to the specific details of the above embodiments. Within the scope of the technical concept of this disclosure, various simple modifications can be made to the technical solutions of this disclosure, and these simple modifications all fall within the protection scope of this disclosure.

[0113] 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. In order to avoid unnecessary repetition, this disclosure will not describe the various possible combinations separately.

[0114] Furthermore, various different embodiments of this disclosure can be combined in any way, as long as they do not violate the spirit of this disclosure, they should also be regarded as the content disclosed in this disclosure.

Claims

1. A battery pack, characterized in that, include: Battery module; The housing has a receiving cavity, the battery module is disposed in the receiving cavity, and there is a filling cavity between the battery module and at least a portion of the side wall of the housing; The glue-filling structure includes a first glue-filling part disposed in the filling cavity, and there is a gap between the top surface of the first glue-filling part and the top surface of the receiving cavity; as well as A gas guide includes a first gas guide disposed in the gap, the first gas guide being used to store gas and / or to guide gas in the battery pack to the outside of the battery pack.

2. The battery pack according to claim 1, characterized in that, The height of the top surface of the first air guide is higher than the height of the top surface of the battery module; and / or, The bottom surface of the first air guide is lower than the top surface of the battery module.

3. The battery pack according to claim 1, characterized in that, The housing includes a lower shell and an upper cover, and the upper cover is connected to a connecting surface located at the upper end of the lower shell. The height of the top surface of the first air guide is higher than the height of the connecting surface, and part of the inner wall of the upper cover is constructed as the top surface of the receiving cavity.

4. The battery pack according to claim 3, characterized in that, The first air guide is configured as a compressible component, and the first air guide is compressed in the height direction of the battery pack and abuts between the upper cover and the first potting part.

5. The battery pack according to claim 1, characterized in that, The housing is provided with an exhaust port, which is used to communicate with the exhaust channel of the first air guide.

6. The battery pack according to claim 5, characterized in that, The enclosure includes a base plate and a frame disposed on the base plate; The gap is located between the frame and the battery module, and the vent is provided on the frame.

7. The battery pack according to claim 1, characterized in that, The distance between the top surface of the first glue-filling part and the top surface of the receiving cavity is 5mm to 10mm.

8. The battery pack according to claim 1, characterized in that, The first air guide is bonded to the top surface of the first glue-filling part, or the first air guide is bonded to the inner wall of the upper cover of the box.

9. The battery pack according to claim 1, characterized in that, The lower end of the first air guide abuts against the top surface of the first glue-filling part.

10. The battery pack according to claim 1, characterized in that, The battery pack also includes a second potting section and a second air guide component; The second potting section and the second air guide are both disposed between the top surface of the battery module and the top cover of the housing; The second gas guide is connected to the first gas guide so that the gas passage of the second gas guide can communicate with the gas passage of the first gas guide.

11. The battery pack according to claim 10, characterized in that, The number of the second air guides is multiple, and the multiple second air guides are arranged at intervals between the top surface of the battery module and the top cover; The plurality of second dispensing sections include a plurality of sub-dispensing sections, and the sub-dispensing sections are disposed between two adjacent second air guides.

12. The battery pack according to claim 11, characterized in that, The sum of the areas of the projections of the plurality of sub-potting portions along the height direction of the battery pack is A1, and the area of ​​the projection of the top surface of the battery module along the height direction of the battery pack is A2. A1 and A2 satisfy: A1≥0.9A2.

13. The battery pack according to claim 11, characterized in that, Multiple second air guides are spaced apart in the first direction; The gap includes two first gaps, which are arranged on both sides of the battery pack in the second direction; The first air guide is arranged in both of the first gaps, and the sub-pouring part is also provided between the first air guide and the second air guide in the first direction; Multiple second air guides are located at both ends of the second direction and are connected to the first air guide, and the first direction intersects the second direction.

14. The battery pack according to claim 13, characterized in that, The gap also includes two second gaps, which are arranged on both sides of the battery pack in the first direction; The first air guide is provided in both of the second gaps.

15. The battery pack according to claim 14, characterized in that, The two first gaps and the two second gaps are connected to form an annular gap; The first air guide is an annular component, or the first air guide is formed by splicing together multiple first sub-air guides.

16. The battery pack according to claim 10, characterized in that, The second air guide is adhered to the top surface of the battery module, or the second air guide is adhered to the inner wall of the upper cover of the housing.

17. The battery pack according to any one of claims 1-16, characterized in that, The gas guide is provided with a gas channel; The gas passage is used for gas to flow through, and / or the gas passage is used for gas storage.

18. The battery pack according to claim 17, characterized in that, The air guide is a foam component, and the foam component has multiple air holes, which are configured as gas channels.

19. The battery pack according to claim 18, characterized in that, The open area ratio of the foam component is ≥85%.

20. An electrical appliance, characterized in that, Includes the battery pack according to any one of claims 1-19.

21. A method for assembling a battery pack, characterized in that, The method includes: The system provides a battery module, adhesive, a first air guide component, and a housing, wherein the housing has a receiving cavity. The battery module is installed in the receiving cavity, and a filling cavity is formed between the battery module and at least a portion of the side wall of the housing; Glue is poured into the filling cavity to form a first glue-filled portion within the filling cavity; The first air guide is arranged in the gap between the top surface of the first glue-filling part and the top surface of the receiving cavity; The first gas guide is used to store gas and / or to guide gas inside the battery pack to the outside of the battery pack.

22. The battery pack assembly method according to claim 21, characterized in that, The housing includes a lower shell and an upper cover, the upper cover serving to define the receiving cavity together with the lower shell. The step of arranging the first air guide in the gap between the top surface of the first glue-filling part and the top wall of the receiving cavity includes: First, the first air guide is placed on the top surface of the first glue-filling part, and then the upper cover is connected to the lower housing, wherein a portion of the inner wall of the upper cover is configured as the top surface of the receiving cavity; or, First, the first air guide is placed on the inner wall of the top surface of the upper cover, which is constructed as the receiving cavity, and then the upper cover is connected to the lower housing.

23. The battery pack assembly method according to claim 21 or 22, characterized in that, The method also includes: Provide a second air guide; The second gas guide is arranged in the gap between the top surface of the battery module and the top surface of the receiving cavity, and the gas channel of the second gas guide is connected to the gas channel of the first gas guide. Glue is poured into the gap between the top surface of the battery module and the top surface of the receiving cavity to form a second glue-filled section.

24. The battery pack assembly method according to claim 23, characterized in that, The housing also includes an upper cover and a lower shell, the upper cover and the lower shell together defining the receiving cavity. The step of arranging the second air guide within the gap between the top surface of the battery module and the top surface of the receiving cavity includes: First, the second air guide is placed on the top surface of the battery module, and then the upper cover is connected to the lower housing, with a portion of the inner wall of the upper cover forming the top surface of the receiving cavity; or, First, the second air guide is placed on the inner wall of the top surface of the upper cover, which is constructed as the receiving cavity, and then the upper cover is connected to the lower housing.

25. The battery pack assembly method according to claim 23, characterized in that, The number of second air guides is multiple, and the multiple second air guides are arranged at intervals along the first direction between the top surface of the battery module and the top surface of the receiving cavity. The process of filling the gap between the top surface of the battery module and the top surface of the receiving cavity with adhesive includes: Fill the gap between each pair of adjacent second air guides with adhesive; Apply adhesive to the gap between the first air guide and the second air guide located in the first direction.

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