Battery pack sealing structure and battery pack

Abstract

The utility model relates to the technical field of batteries, and discloses a battery pack sealing structure and a battery pack. The battery pack sealing structure comprises an edge beam located on the peripheral side of a battery module of the battery pack, a cavity and an airflow channel are arranged in the edge beam, and the airflow channel is arranged along the peripheral wall of the cavity; the bottom plate is connected with the edge beam and is positioned below the battery module, and a first through hole communicated with the airflow channel is formed in the bottom plate; the bottom protection plate is connected with the edge beam and located below the bottom plate, and a sealed cavity is formed between the bottom protection plate and the bottom plate; the sealing cavity communicates with the airflow channel through the first through hole, and the end, away from the sealing cavity, of the airflow channel communicates with the outside atmosphere through a ventilation structure. The air flow channel and the first through hole are used for communicating the external atmosphere with the sealing cavity, so that the internal pressure in the sealing cavity can be kept consistent with the pressure of the external atmosphere, the internal air pressure of the sealing cavity is balanced, and the bottom protection plate is prevented from generating abnormal sound or deformation under the influence of the air pressure.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field, concretely relates to a battery pack sealing structure and battery pack. BACKGROUND

[0002] In the electric automobile, the battery pack as the energy supply device is generally arranged in the middle of the automobile, below the floor, that is, at the bottom of the automobile. When the electric automobile drives on some road sections with many working conditions and complex road conditions, it often encounters bottom touching and bumping, thereby causing the battery pack to be impacted, extruded and seriously deformed, leading to the rupture of the battery pack, electrolyte leakage, battery fire and explosion and other dangers. Therefore, at present, a protective plate is usually arranged on the bottom of the battery pack. At the same time, in order to avoid the battery pack contacting corrosive substances such as water vapor in the external environment through the gap between the protective plate and the battery pack, the protective plate and the battery pack are usually connected in a sealed manner.

[0003] However, since the temperature of the use environment of the battery pack changes, the gas pressure between the protective plate and the battery pack changes under the influence of temperature. When the change amplitude of the gas pressure is too large, the protective plate is prone to emit abnormal sound or produce deformation, thereby affecting the subsequent protection effect of the battery pack. SUMMARY

[0004] Therefore, the utility model provides a battery pack sealing structure and battery pack to solve the problem that the existing battery pack protective plate is prone to emit abnormal sound or produce deformation under the influence of gas pressure change.

[0005] In a first aspect, the utility model provides a battery pack sealing structure, which comprises:

[0006] The edge beam is located at the side of the battery module of the battery pack, and the edge beam is internally provided with a cavity and an airflow channel, and the airflow channel is arranged along the outer peripheral wall of the cavity.

[0007] The bottom plate is connected with the edge beam and located below the battery module, and the bottom plate is provided with a first through hole in communication with the airflow channel.

[0008] The bottom protective plate is connected with the edge beam and located below the bottom plate, and a sealed cavity is formed between the bottom protective plate and the bottom plate. The sealed cavity is in communication with the airflow channel through the first through hole, and one end of the airflow channel away from the sealed cavity is in communication with the external atmosphere through a gas permeable structure.

[0009] Beneficial effects: the utility model discloses utilize airflow channel and first through -hole to connect with sealed cavity outside atmosphere, can make the internal pressure of sealed cavity and the pressure of outside atmosphere keep consistent, realize the internal air pressure of balanced sealed cavity, avoid the abnormal sound or produce deformation of bottom guard plate under the influence of air pressure, ensure that bottom guard plate can always be at the preset position and long -term effectively play its own protective performance. Further, through setting up the air -permeable structure at the one end of airflow channel away from sealed cavity, can make the air flow of sealed cavity in and out of airflow channel, effectively balance the internal air pressure of battery pack, can also prevent the water vapor of outside environment and the corrosion of easy battery pack to follow the air flow into the sealed cavity and the main body structure of battery pack contact, improve the use safety of battery pack.

[0010] In an alternative embodiment, the airflow channel includes a first flow channel and a second flow channel in communication, the first flow channel extends along the width direction of the edge beam and is provided with the air-permeable structure at one end, and the second flow channel extends along the height direction of the edge beam and is in communication with the sealed cavity through the first through-hole at one end.

[0011] Beneficial effects: the utility model discloses the airflow channel is set to the first flow channel and the second flow channel in communication and angle setting, can make airflow channel avoid the cavity in the edge beam on one hand, prevent airflow channel from interfering with the cavity, guarantee the rationality of the layout of airflow channel in the edge beam. On the other hand, it can also make the air flow according to the preset flow path, guarantee the smoothness of air flow.

[0012] In an alternative embodiment, the cavity includes a first assembly cavity and a second assembly cavity, and the first assembly cavity and the second assembly cavity are arranged at intervals in the direction towards the bottom plate; a partition is arranged between the first assembly cavity and the second assembly cavity, the first flow channel is located in the partition, and the second flow channel is located in the side wall of the second assembly cavity.

[0013] Beneficial effects: the utility model discloses the first flow channel is arranged in the partition, and the second flow channel is arranged in the side wall of the second assembly cavity, which can make the airflow channel avoid the cavity in the edge beam on one hand, prevent airflow channel from interfering with the cavity, and on the other hand, the airflow channel can be hidden in the edge beam without affecting the strength of the edge beam. In this way, not only the complexity of the processing process is reduced, but also the time and cost required in the processing process are reduced.

[0014] In an alternative embodiment, the edge beam is provided with a fixing seat on the side facing the battery module, the fixing seat is fixed on the bottom plate, a third assembly cavity is formed in the fixing seat, and the second flow channel is formed in the side wall between the third assembly cavity and the second assembly cavity.

[0015] Beneficial effects: The setting of the fixed seat enhances the stability of the connection between the side beam and the bottom plate, guarantees the stability of the overall structure, and better cooperates to provide reliable support and fixing effect for the battery module and related components. Secondly, the thickness of the side wall between the third assembly cavity and the second assembly cavity is thicker than that of the side wall of other areas of the second assembly cavity. Therefore, the second flow channel is arranged in the side wall, which can reduce the molding difficulty and processing error of the second flow channel on the one hand, and can ensure that the side wall still has good structural strength after the second flow channel is formed on the other hand.

[0016] In an optional embodiment, the distance between the second flow channel and the third assembly cavity is S1, and S1 is in the range of S1≥3mm.

[0017] Beneficial effects: The distance S1 between the second flow channel and the third assembly cavity is S1≥3mm, which means that the processing of the second flow channel can have a relatively generous operating space, reducing the possibility of errors caused by excessively high processing precision requirements, making the processing operation easier to control. At the same time, such a setting can also ensure that the side wall of the second flow channel has sufficient thickness, preventing it from being easily damaged and deformed due to thin walls, and enhancing the overall structural strength and durability of the second flow channel.

[0018] In an optional embodiment, the first through hole is coaxially arranged with the second flow channel.

[0019] Beneficial effects: Compared with the non-coaxial arrangement of the first through hole and the second flow channel, the coaxial arrangement of the first through hole and the second flow channel in the utility model means that the molding of the first through hole and the second flow channel can be completed at the same time through one operation, without having to process the first through hole and the second flow channel in two steps. In this way, the complexity of the processing process is reduced, and the time required for the processing process is also reduced.

[0020] In an optional embodiment, a sealing strip is arranged between the bottom plate and the bottom guard plate, the first through hole is located on the side of the sealing strip close to the battery module and has a first interval L1 with the sealing strip, and L1 is in the range of L1≥2mm; and / or, the bottom plate is connected to the side beam through a fastener, and the fastener has a second interval L2 with the first through hole, and L2 is in the range of L2≥2mm.

[0021] Beneficial effects: By setting the sealing strip, the gap between the bottom plate and the bottom guard plate can be filled and sealed, so that a sealed space can be formed between the bottom plate and the bottom guard plate, avoiding contact between water vapor in the external atmosphere and the bottom plate, reducing the probability of corrosion and damage of the bottom plate, and prolonging the service life of the bottom plate. Further, a first interval L1 is left between the sealing strip and the first through hole, which can prevent the sealing strip from blocking the first through hole after compression deformation, ensuring the connection effect between the sealing cavity and the external atmosphere. Similarly, a second interval L2 is left between the fastener and the first through hole, which can prevent the fastener from blocking the first through hole after the bottom plate is fixed on the edge beam, ensuring that the sealing cavity can always be unobstructed through the first through hole and the airflow channel, thereby ensuring the stability of the internal air pressure of the sealing cavity.

[0022] In an optional embodiment, the diameter of the airflow channel is φ, φ is in the range of φ≥3mm; the distance between the airflow channel and the cavity is S2, S2 is in the range of S2≥3mm; the cavity peripheral wall thickness at the position of the airflow channel is T, T is in the range of T≥φ+2S2.

[0023] Beneficial effects: The diameter φ of the airflow channel is ≥3mm, on the one hand, it can avoid the problem of using high precision and complex process due to the too small diameter φ of the airflow channel, making the processing and forming process of the airflow channel more simple and convenient. On the other hand, it can increase the flow of airflow in the airflow channel, so that the airflow can enter or exit the sealed cavity through the airflow channel in a short time, shorten the time required for internal pressure regulation of the sealed cavity, and improve the efficiency of pressure regulation.

[0024] In addition, the distance S2 between the airflow channel and the cavity is ≥3mm, which means that a relatively spacious operating space can be provided for the processing of the airflow channel, reducing the possibility of errors caused by excessively high processing precision requirements, making the processing operation easier to control. At the same time, such a setting can also ensure that the side wall of the airflow channel has sufficient thickness, preventing it from being easily damaged and deformed due to thinness, and enhancing the overall structural strength and durability of the airflow channel.

[0025] The cavity peripheral wall thickness T at the position of the airflow channel is ≥φ+2S2, which can reduce the difficulty of processing the airflow channel at this position, and can also ensure that the peripheral wall of the cavity has good structural strength after the airflow channel is formed. In this way, both the cavity and the airflow channel can continuously and stably play their own roles, improving the stability and reliability of the structure.

[0026] In an optional embodiment, the side beam away from the battery module side is provided with a mounting groove, and the groove bottom is provided with a second through hole communicating with the airflow channel; the air permeable structure is detachably arranged in the mounting groove.

[0027] Beneficial effects: By setting the installation groove on the side beam, not only can the operator judge the installation position of the ventilation structure on the side beam in a short time, but also can quickly complete the installation and positioning of the ventilation structure and the side beam. Further, the ventilation structure is arranged in the installation groove in a detachable manner, which facilitates the later maintenance and repair work. When the ventilation structure fails or needs to be replaced, the operator can easily disassemble it for corresponding operation, which not only improves the maintenance efficiency, but also reduces the maintenance cost.

[0028] In addition, the second through hole is arranged at the groove bottom of the installation groove, which can connect the ventilation structure with the airflow channel, and ensure that the airflow can smoothly pass through the ventilation structure to enter and exit the airflow channel.

[0029] In a second aspect, the utility model also provides a battery pack, which comprises:

[0030] A battery module;

[0031] An upper shell located above the battery module;

[0032] The above-mentioned battery pack sealing structure, the upper shell is connected with the side beam, and forms a sealed space containing the battery module together with the side beam and the bottom plate.

[0033] Beneficial effects: The battery pack installed with the above-mentioned battery pack sealing structure can balance the internal air pressure between the bottom protection plate and the bottom plate, avoid the bottom protection plate emitting abnormal sound or deforming under the influence of air pressure, ensure that the bottom protection plate can long-term effectively play its own protection performance, improve the use safety of the battery pack, and prolong the service life of the battery pack.

[0034] In addition, since the battery pack of the utility model adopts the above-mentioned battery pack sealing structure, the battery pack of the utility model also has other advantages of the above-mentioned battery pack sealing structure, which will not be described here. BRIEF DESCRIPTION OF DRAWINGS

[0035] In order to more clearly illustrate the specific embodiments of the utility model or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the specific embodiments or the prior art description. Obviously, the drawings in the following description are some embodiments of the utility model, and those skilled in the art can also obtain other drawings according to these drawings without creating labor.

[0036] Figure 1 It is a part structure schematic view of a battery pack of the utility model embodiment;

[0037] Figure 2 It is Figure 1A schematic diagram of the battery pack from another perspective;

[0038] Figure 3 for Figure 1 The diagram shows the structure of the battery pack from another perspective.

[0039] Figure 4 This is a cross-sectional schematic diagram of a battery pack according to an embodiment of the present utility model.

[0040] Explanation of reference numerals in the attached figures:

[0041] 1. Side beam; 101. Cavity; 1011. First assembly cavity; 1012. Second assembly cavity; 102. Airflow channel; 1021. First flow channel; 1022. Second flow channel; 103. Fixing seat; 1031. Third assembly cavity; 104. Mounting groove; 2. Base plate; 201. First through hole; 3. Bottom guard plate; 4. Sealed cavity; 5. Ventilation structure; 6. Sealing strip; 7. Fastener; 8. Upper shell; 9. Sealed space. Detailed Implementation

[0042] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0043] To address the problem that existing battery pack protective plates are prone to making abnormal noises or deforming under the influence of air pressure changes, this utility model provides a battery pack sealing structure and a battery pack.

[0044] The following is combined with Figures 1 to 4 The following describes embodiments of the present invention.

[0045] According to embodiments of the present invention, on the one hand, such as Figures 1 to 4 As shown, a battery pack sealing structure is provided, including: a side beam 1, a bottom plate 2, and a bottom protective plate 3.

[0046] Specifically, the side beam 1 is located on the periphery of the battery module of the battery pack. The side beam 1 has a cavity 101 and an airflow channel 102 inside. The airflow channel 102 is arranged along the outer peripheral wall of the cavity 101. The bottom plate 2 is connected to the side beam 1 and is located below the battery module. The bottom plate 2 has a first through hole 201 that communicates with the airflow channel 102. The bottom guard plate 3 is connected to the side beam 1 and is located below the bottom plate 2. A sealed cavity 4 is formed between the bottom guard plate 3 and the bottom plate 2. The sealed cavity 4 is connected to the airflow channel 102 through the first through hole 201. The end of the airflow channel 102 away from the sealed cavity 4 is connected to the outside atmosphere through a ventilated structure 5.

[0047] Compared to a solid side beam 1, by incorporating a cavity 101 within the side beam 1, the weight of the battery pack can be reduced, aligning with the trend towards lightweight battery packs. Furthermore, when the side beam 1 is subjected to external impact, the cavity 101 can collapse and absorb energy, reducing energy transfer, lowering the probability of damage to the battery module, and improving the safety of the battery pack. Secondly, to ensure that the base plate 2 and bottom protective plate 3 form a unified whole with the side beam 1, they can be connected to the side beam 1 using connectors such as screws. Because the side beam 1 contains the cavity 101, connectors can be easily inserted into the side beam 1 without easily interfering with other structures.

[0048] It is understood that the bottom plate 2 and the bottom protective plate 3 can also be connected to the side beam 1 by welding or other means to form a whole. The embodiments of this utility model are not specifically limited here.

[0049] Furthermore, in this embodiment, the airflow channel 102 is arranged along the outer peripheral wall of the cavity 101. On the one hand, the airflow channel 102 can avoid the cavity 101; on the other hand, it can not only make full use of the internal space of the cavity 101, but also hide the airflow channel 102 in the side beam 1, making the appearance of the battery pack simple and beautiful.

[0050] It should be noted that the sealing cavity 4 is set between the bottom protective plate 3 and the bottom plate 2 for the following two reasons: First, to prevent water vapor and other substances in the external environment from directly contacting the bottom plate 2 and causing corrosion damage to the bottom plate 2; Second, to prevent the bottom plate 2 from being subjected to large external impact forces.

[0051] For the reasons mentioned above, this embodiment utilizes the airflow channel 102 and the first through hole 201 to connect the outside atmosphere with the sealed cavity 4. This ensures that the internal pressure inside the sealed cavity 4 remains consistent with the external atmospheric pressure, achieving pressure balance within the sealed cavity 4. This prevents the bottom protective plate 3 from making abnormal noises or deforming under the influence of air pressure, ensuring that the bottom protective plate 3 remains in the preset position and effectively performs its protective function for a long period. Furthermore, by providing a ventilated structure 5 at the end of the airflow channel 102 away from the sealed cavity 4, airflow can smoothly enter and exit the sealed cavity 4 through the airflow channel 102, effectively balancing the internal air pressure of the battery pack. At the same time, it can also prevent corrosive substances such as water vapor from the external environment from entering the sealed cavity 4 with the airflow and coming into contact with the main structure of the battery pack, thus improving the safety of the battery pack.

[0052] Furthermore, the airtightness of the sealed cavity 4 can also be tested using the airflow channel 102 and the first through hole 201. Specifically, before installing the ventilated structure 5, a certain amount of gas is introduced into the sealed cavity 101 through the airflow channel 102 and the first through hole 201 using relevant equipment. Then, while keeping factors such as temperature constant, it is observed whether the internal pressure of the sealed cavity 101 changes.

[0053] It should be noted that the base plate 2 in this embodiment may be, but is not limited to, a cold plate.

[0054] According to one embodiment of the present invention, such as Figure 4 As shown, the airflow channel 102 includes a first flow channel 1021 and a second flow channel 1022 that are connected. The first flow channel 1021 extends along the width direction of the side beam 1 and has a ventilated structure 5 at one end. The second flow channel 1022 extends along the height direction of the side beam 1 and has one end connected to the sealed cavity 4 through a first through hole 201. In this embodiment, the airflow channel 102 is configured as a first flow channel 1021 and a second flow channel 1022 that are connected and angled. On the one hand, this allows the airflow channel 102 to avoid the cavity 101 inside the side beam 1, preventing interference between the airflow channel 102 and the cavity 101 and ensuring the rationality of the layout of the airflow channel 102 inside the side beam 1. On the other hand, it also allows the airflow to flow according to a preset flow path, ensuring the smoothness of the airflow.

[0055] It should be noted that the ventilated structure 5 in this embodiment can be, but is not limited to, a ventilated valve. The ventilated valve can ensure that the airflow can smoothly enter and exit the airflow channel 102 while preventing water vapor in the air from entering the sealed cavity 4 through the airflow channel 102.

[0056] According to one embodiment of the present invention, such as Figure 3 and Figure 4As shown, the cavity 101 includes a first assembly cavity 1011 and a second assembly cavity 1012. The first assembly cavity 1011 and the second assembly cavity 1012 are arranged at intervals in the direction towards the base plate 2. A partition is provided between the first assembly cavity 1011 and the second assembly cavity 1012, and a first flow channel 1021 is located within the partition. A second flow channel 1022 is located within the side wall of the second assembly cavity 1012. In this embodiment, the first flow channel 1021 is located within the partition, and the second flow channel 1022 is located within the side wall of the second assembly cavity 1012. This allows the airflow channel 102 to avoid the cavity 101 within the side beam 1, preventing interference between the airflow channel 102 and the cavity 101. Furthermore, without affecting the strength of the side beam 1 itself, the airflow channel 102 can be hidden within the side beam 1. This not only improves the utilization rate of the internal space of the side beam 1 but also reduces the number of connecting pipes and lowers the complexity of the structure.

[0057] According to one embodiment of the present invention, such as Figure 3 and Figure 4 As shown, a fixing seat 103 is provided on the side of the side beam 1 facing the battery module. The fixing seat 103 is fixed to the base plate 2. A third assembly cavity 1031 is formed inside the fixing seat 103. A second flow channel 1022 is formed in the side wall between the third assembly cavity 1031 and the second assembly cavity 1012. The setting of the fixing seat 103 enhances the stability of the connection between the side beam 1 and the base plate 2, ensures the stability of the overall structure, and enables it to better cooperate and provide reliable support and fixation for the battery module and other related components. Secondly, the side wall between the third assembly cavity 1031 and the second assembly cavity 1012 is thicker than the side wall of other areas of the second assembly cavity 1012. Therefore, setting the second flow channel 1022 in this side wall can reduce the molding difficulty and processing error of the second flow channel 1022 on the one hand, and ensure that the side wall still has good structural strength after the second flow channel 1022 is formed.

[0058] It is understandable that the side wall between the third assembly cavity 1031 and the second assembly cavity 1012 is formed by the fixed seat 103 and the side beam 1. Therefore, given that the side wall between the third assembly cavity 1031 and the second assembly cavity 1012 is relatively thick, the second flow channel 1022 can be entirely set on the side beam 1, entirely set on the fixed seat 103, or partly set on the side beam 1 and partly set on the fixed seat 103.

[0059] It should be noted that the third assembly cavity 1031 in this embodiment can also provide space to accommodate some of the fasteners 7. These fasteners 7 are the same fasteners 7 used below to connect the base plate 2 to the fixing seat 103.

[0060] According to one embodiment of the present invention, such asFigure 4 As shown, the distance between the second flow channel 1022 and the third assembly cavity 1031 is S1, and the range of S1 is S1≥3mm. A distance S1≥3mm between the second flow channel 1022 and the third assembly cavity 1031 means that a relatively spacious operating space is provided for the processing of the second flow channel 1022, reducing the possibility of errors caused by excessively high processing precision requirements, and making the processing operation easier to control. At the same time, this design also ensures that the sidewalls of the second flow channel 1022 have sufficient thickness, preventing damage and deformation due to thin walls, and enhancing the overall structural strength and durability of the second flow channel 1022.

[0061] According to one embodiment of the present invention, such as Figure 4 As shown, the first through hole 201 and the second flow channel 1022 are coaxially arranged. Compared to a non-coaxial arrangement of the first through hole 201 and the second flow channel 1022, this embodiment arranges the first through hole 201 and the second flow channel 1022 coaxially. This means that when processing the first through hole 201 and the second flow channel 1022, the forming of the first through hole 201 and the second flow channel 1022 can be completed simultaneously in one operation, eliminating the need to process the first through hole 201 and the second flow channel 1022 separately in two steps. This not only reduces the complexity of the processing but also reduces the time and cost required for processing.

[0062] According to one embodiment of the present invention, such as Figure 3 and Figure 4 As shown, a sealing strip 6 is provided between the bottom plate 2 and the bottom protective plate 3. The first through hole 201 is located on the side of the sealing strip 6 close to the battery module and there is a first gap L1 between the sealing strip 6 and the sealing strip 6. The range of L1 is L1≥2mm.

[0063] According to one embodiment of the present invention, such as Figure 3 and Figure 4As shown, the base plate 2 is connected to the side beam 1 by fasteners 7. A second gap L2 is left between the fasteners 7 and the first through hole 201, and the range of L2 is L2≥2mm. By setting the sealing strip 6, the gap between the base plate 2 and the bottom protective plate 3 can be filled and sealed, so that a sealed space 9 can be formed between the base plate 2 and the bottom protective plate 3, preventing water vapor in the outside atmosphere from contacting the base plate 2, reducing the probability of corrosion damage to the base plate 2, and extending the service life of the base plate 2. Furthermore, the first gap L1 left between the sealing strip 6 and the first through hole 201 can prevent the sealing strip 6 from blocking the first through hole 201 after compression deformation, ensuring the communication effect between the sealed cavity 4 and the outside atmosphere. Similarly, a second gap L2 is left between the fastener 7 and the first through hole 201 to prevent the fastener 7 from blocking the first through hole 201 after fixing the base plate 2 to the side beam 1, ensuring that the sealed cavity 4 can always be kept open to the airflow channel 102 through the first through hole 201, thereby ensuring the stability of the air pressure inside the sealed cavity 4.

[0064] It should be noted that the fastener 7 in this embodiment can be, but is not limited to, screws and studs.

[0065] According to one embodiment of the present invention, such as Figure 4 As shown, the diameter of the airflow channel 102 is φ, and the range of φ is ≥ 3mm; the distance between the airflow channel 102 and the cavity 101 is S2, and the range of S2 is ≥ 3mm. The diameter φ of the airflow channel 102 being ≥ 3mm serves two purposes. First, it avoids the need for high-precision, complex processes due to an excessively small diameter φ, making the processing of the airflow channel 102 simpler and more convenient. Second, it increases the airflow rate in the airflow channel 102, allowing the airflow to enter or exit the sealed cavity 4 quickly, shortening the time required for pressure regulation within the sealed cavity 4 and improving the efficiency of pressure regulation.

[0066] Furthermore, the distance S2 between the airflow channel 102 and the cavity 101 is ≥3mm, which means that a relatively spacious operating space can be provided for the machining of the airflow channel 102, reducing the possibility of errors caused by excessively high machining accuracy requirements, and making the machining operation easier to control. At the same time, this setting can also ensure that the sidewall of the airflow channel 102 has sufficient thickness, preventing damage and deformation due to thin walls, and enhancing the overall structural strength and durability of the airflow channel 102.

[0067] According to one embodiment of the present invention, such as Figure 4As shown, the thickness of the outer peripheral wall of the cavity 101 at the location of the airflow channel 102 is T, and the range of T is T≥φ+2S2. Having a thickness T≥φ+2S2 on the outer peripheral wall of the cavity 101 at the location of the airflow channel 102 reduces the difficulty of processing the airflow channel 102 at this location; furthermore, it ensures that the outer peripheral wall of the cavity 101 retains good structural strength after the airflow channel 102 is formed. This allows both the cavity 101 and the airflow channel 102 to continuously and stably perform their functions, improving the stability and reliability of the structure.

[0068] According to one embodiment of the present invention, such as Figure 3 and Figure 4 As shown, a mounting groove 104 is provided on the side of the side beam 1 away from the battery module. The bottom of the mounting groove 104 has a second through hole communicating with the airflow channel 102. The ventilated structure 5 is detachably installed within the mounting groove 104. By providing the mounting groove 104 on the side beam 1, operators can quickly determine the installation position of the ventilated structure 5 on the side beam 1 and rapidly complete the installation and positioning of the ventilated structure 5 and the side beam 1. Furthermore, the ventilated structure 5 is detachably installed within the mounting groove 104, facilitating subsequent maintenance and repair. When the ventilated structure 5 malfunctions or needs replacement, operators can easily disassemble it for corresponding operations, which not only improves maintenance efficiency but also reduces maintenance costs.

[0069] In addition, a second through hole is provided at the bottom of the mounting groove 104 to connect the ventilated structure 5 with the airflow channel 102, ensuring that the airflow can smoothly pass through the ventilated structure 5 and enter and exit the airflow channel 102.

[0070] It is understandable that, in order to improve the ease of machining the second through hole and the airflow channel 102, the second through hole and the airflow channel 102 can be coaxially arranged.

[0071] According to an embodiment of the present invention, on the other hand, as... Figures 1 to 4 As shown, a battery pack is also provided, including: a battery module, an upper housing 8, and the aforementioned battery pack sealing structure. Specifically, the upper housing 8 is located above the battery module; the upper housing 8 is connected to the side beam 1, and together with the side beam 1 and the base plate 2, forms a sealed space 9 for accommodating the battery module.

[0072] The battery pack with the above-mentioned sealing structure can balance the internal air pressure between the bottom guard plate 3 and the bottom plate 2, preventing the bottom guard plate 3 from making abnormal noises or deforming under the influence of air pressure, ensuring that the bottom guard plate 3 can effectively perform its protective function for a long time, improving the safety of the battery pack and extending its service life.

[0073] Furthermore, since the battery pack of this embodiment adopts the above-described battery pack sealing structure, the battery pack of this embodiment also has other advantages of the above-described battery pack sealing structure, which will not be elaborated further.

[0074] It should be noted that, in order to achieve the basic functions of the battery pack, the battery pack in this embodiment may also include other necessary modules or components, such as a battery management system and a heat dissipation system. It should also be noted that any suitable existing structure can be selected for the other necessary modules or components included in the battery pack.

[0075] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A battery pack sealing structure, characterized in that, include: A side beam is located on the periphery of the battery module in the battery pack. The side beam has a cavity and an airflow channel inside, and the airflow channel is arranged along the outer peripheral wall of the cavity. The base plate is connected to the side beam and located below the battery module. The base plate is provided with a first through hole that communicates with the airflow channel. The bottom protective plate is connected to the side beam and located below the bottom plate, forming a sealed cavity between the bottom protective plate and the bottom plate; the sealed cavity is connected to the airflow channel through the first through hole, and the end of the airflow channel away from the sealed cavity is connected to the outside atmosphere through a breathable structure.

2. The battery pack sealing structure according to claim 1, characterized in that, The airflow channel includes a first flow channel and a second flow channel that are connected to each other. The first flow channel extends along the width direction of the side beam and has the ventilated structure at one end. The second flow channel extends along the height direction of the side beam and has one end connected to the sealed cavity through the first through hole.

3. The battery pack sealing structure according to claim 2, characterized in that, The cavity includes a first assembly cavity and a second assembly cavity, which are arranged at intervals in the direction toward the base plate; a partition is provided between the first assembly cavity and the second assembly cavity, the first flow channel is located inside the partition, and the second flow channel is located inside the side wall of the second assembly cavity.

4. The battery pack sealing structure according to claim 3, characterized in that, A fixing seat is provided on the side of the side beam facing the battery module. The fixing seat is fixed on the base plate. A third assembly cavity is formed in the fixing seat. A second flow channel is formed in the side wall between the third assembly cavity and the second assembly cavity.

5. The battery pack sealing structure according to claim 4, characterized in that, The distance between the second flow channel and the third assembly cavity is S1, and the range of S1 is S1≥3mm.

6. The battery pack sealing structure according to any one of claims 2 to 5, characterized in that, The first through hole and the second flow channel are coaxially arranged.

7. The battery pack sealing structure according to any one of claims 1 to 5, characterized in that, A sealing strip is provided between the base plate and the bottom protective plate. The first through hole is located on the side of the sealing strip near the battery module and is separated from the sealing strip by a first gap L1, the range of which is L1≥2mm; and / or, the base plate is connected to the side beam by fasteners, and a second gap L2 is provided between the fasteners and the first through hole, the range of which is L2≥2mm.

8. The battery pack sealing structure according to any one of claims 1 to 5, characterized in that, The diameter of the airflow channel is φ, and the range of φ is ≥ 3mm; the distance between the airflow channel and the cavity is S2, and the range of S2 is S2 ≥ 3mm; the thickness of the outer peripheral wall of the cavity at the location of the airflow channel is T, and the range of T is T ≥ φ + 2S2.

9. The battery pack sealing structure according to any one of claims 1 to 5, characterized in that, The side beam away from the battery module is provided with a mounting groove, and the bottom of the mounting groove is provided with a second through hole that communicates with the airflow channel; the ventilated structure is detachably installed in the mounting groove.

10. A battery pack, characterized in that, include: Battery module; The upper housing is located above the battery module; According to any one of claims 1 to 9, the upper housing is connected to the side beam, and together with the side beam and the bottom plate, forms a sealed space for accommodating the battery module.

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