Battery sealing structure, battery module and assembly method

Abstract

The application discloses a battery sealing structure, a battery module and an assembling method, relates to the technical field of battery mounting structures, and provides the battery sealing structure on the periphery of a wire passing channel, a surrounding part is arranged on the shell surface of a battery shell in a first direction and surrounds the wire passing channel, so that a region with boundary constraint is formed on the outer side of the wire passing channel; then, a porous pad layer and a sealing glue layer are sequentially arranged on the bearing area, the bearing and buffering effects are formed through the porous pad layer, the sealing glue layer is indirectly arranged on the shell surface, the porous pad layer has a porous structure, can absorb the deformation of cables caused by thermal expansion, vibration or slight displacement, makes the stress transmission between the sealing glue layer and the cables and the shell more moderate, and reduces the risk of cracking or separation of the sealing glue layer. Meanwhile, the connecting part arranged on the shell surface of the battery shell and provided with the first groove plays a role in buffering stress. In summary, the technical scheme has the advantages of high sealing performance, high structural stability and high durability.

Description

Technical Field

[0001] This disclosure relates to the field of battery mounting structure technology, and more specifically, to a battery sealing structure, a battery module, and an assembly method. Background Technology

[0002] For batteries, a cable passage structure is needed on the battery casing to connect the battery cells inside the casing to the outside. Clearly, the cable passage location involves openings, cable movement, and communication with the internal and external environments, often making it a key area for battery casing seal failure and structural reliability degradation. To address these issues, those skilled in the art typically employ the following technical solutions: 1. Directly coating or injecting sealant around the cable passage hole to encapsulate the cable and cover the passage area, achieving a seal. To improve sealing performance, the injection area is often expanded. However, due to the increased overall rigidity after large-area curing of the sealant, stress is difficult to release when the casing or cable undergoes thermal expansion, deformation, or vibration, easily leading to significant stress concentration at the sealant boundary. 2. Using flexible materials as a support to support the sealant, allowing it to adapt to cable thermal expansion, deformation, or vibration. However, flexible materials have significant compressive deformation capacity, and under long-term load or thermal cycling, thickness attenuation or localized collapse can easily occur. It is evident that using a high-rigidity structure to improve the stability of the wiring area can easily concentrate mechanical loads on the sealing layer, leading to seal failure. Conversely, using flexible materials to alleviate stress on the sealant can weaken the overall support capacity of the sealing area, resulting in insufficient long-term stability of the sealing interface. Therefore, how to improve structural stability and durability while ensuring the sealing performance of the wiring area has become a pressing technical problem to be solved in this field.

[0003] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this disclosure. Summary of the Invention

[0004] The purpose of this disclosure is to provide a battery sealing structure, a battery module, and an assembly method to solve the technical problem that existing battery sealing structures are unable to improve structural stability and durability while ensuring the sealing performance of the wiring area.

[0005] Other features and advantages of this disclosure will become apparent from the following detailed description, or may be learned in part by practice of this disclosure.

[0006] According to one aspect of this disclosure, a battery sealing structure is provided, disposed on a battery casing, comprising: A cable passage is provided on the battery housing for cables to pass through the battery housing to the outside. The surrounding portion protrudes along the first direction on the outer surface of the battery housing and surrounds the wire passage, with a bearing area left between it and the edge of the wire passage; A porous pad is disposed on the bearing area; A sealant layer is disposed on the porous pad layer; A connecting portion is disposed on the outer surface of the battery housing and is provided with a first groove opened along the first direction; Wherein, along the first direction, the projection of the connecting portion is connected to the projection of the surrounding portion, and the first groove is spaced apart from the bearing area.

[0007] In some embodiments of this disclosure, the edge of the cable passage is equally spaced from the surrounding portion, making the bearing area annular; the porous pad is stacked on the bearing area, a portion of the porous pad covers the bearing area along the first direction, another portion of the porous pad covers the top of the cable passage along the first direction, and a first clearance hole is provided at the position of the cable.

[0008] In some embodiments of this disclosure, the sealant layer is formed in the surrounding portion by potting, the sealant layer is connected to the pore pad layer and the inner wall surface of the surrounding portion respectively, the sealant layer has a second clearance hole at the position corresponding to the cable, and the sealant layer does not extend beyond the surrounding portion along the first direction.

[0009] In some embodiments of this disclosure, the porous pad layer is further provided with a connecting hole along the first direction. Along the first direction, one end of the projection of the connecting hole is connected to the projection of the first clearance hole, and the other end of the projection of the connecting hole extends to the edge of the porous pad layer.

[0010] In some embodiments of this disclosure, the battery housing includes a lower housing and a top cover mounted on the lower housing; the wiring channel is formed on the lower housing; The number of the connecting parts is several, and at least one of the connecting parts is disposed at one end of the wire passage facing the top cover.

[0011] In some embodiments of this disclosure, the number of the connecting portions is at least two, and at least one of the connecting portions is located at the other end of the wire passage away from the top cover.

[0012] In some embodiments of this disclosure, the bottom wall of the first groove is provided with a ventilation hole, which extends to the inner wall surface of the lower housing; a sealing part is movably installed inside the first groove, and the sealing part is configured in a first state and a second state. When the sealing part is in the first state, the vent is blocked; when the sealing part is in the second state, the vent connects the lower housing to the outside.

[0013] In some embodiments of this disclosure, the sealing part includes a sealing base and a sealing movable part, the sealing movable part being movable between a first position and a second position. When the sealing movable part is in the first position, the sealing part is in a first state; when the sealing movable part is in the second position, the sealing part is in a second state.

[0014] In some embodiments of this disclosure, the sealing base is elastic and includes a sealing cylinder, a sealing deformation part, and a closing part connected in sequence; the sealing cylinder is sleeved in the first groove and does not contact the bottom wall of the first groove; a deformation gap is left between one end of the sealing deformation part and the transition edge of the first groove; the closing part is fitted to the bottom wall of the first groove. The number of the sealing parts is multiple and arranged around the ventilation hole to form an openable and closable sealing hole.

[0015] In some embodiments of this disclosure, the sealing movable part includes a movable plate, which is sleeved inside the sealing cylinder and slidably connected to the sealing cylinder; the movable plate has a pushing part protruding at the position corresponding to the sealing deformation part, and a pinhole part protruding at the position corresponding to the sealing hole; When the sealing movable part is in the second position, the sealing part is in the second state, the sealing deformation part is deformed by the pushing part in the direction close to the deformation gap, causing the sealing hole to open; the pinhole part is pushed by the movable plate to pass through the sealing hole.

[0016] In some embodiments of this disclosure, the wall surface of the sealing hole formed by the closure portion includes a first wall surface and a second wall surface that are sequentially connected in a direction away from the sealing movable portion; a plurality of first wall surfaces surround to form a closed portion of the sealing hole, and the second wall surface is arranged to expand outward relative to the first wall surface.

[0017] According to one aspect of this disclosure, a battery module is provided, including a battery housing and a battery sealing structure as described above disposed on the battery housing.

[0018] According to one aspect of this disclosure, an assembly method is provided for assembling a battery sealing structure as described above, comprising: Pass the cable through the cable passage and extend it to the outside of the battery casing; The porous padding layer is placed within the load-bearing area of ​​the surrounding part; The sealant layer is placed on the porous pad layer.

[0019] As can be seen from the above technical solutions, the battery sealing structure, battery module, and assembly method in the exemplary embodiments of this disclosure have at least the following advantages and positive effects: The above technical solution involves a surrounding portion protruding along a first direction on the outer surface of the battery casing and surrounding the wiring channel, forming a boundary-constrained area outside the wiring channel. Then, a porous pad and a sealant layer are sequentially arranged in the bearing area. The porous pad provides support and buffering, while the sealant layer is indirectly placed on the battery casing surface. The porous pad has a porous structure that absorbs deformation caused by thermal expansion, vibration, or slight displacement of the cable, making stress transmission between the sealant layer and the cable / casing more moderate and reducing the risk of cracking or detachment of the sealant layer. Based on this, a connecting part is disposed on the outer surface of the battery casing and is equipped with a first groove opened along a first direction. The connecting part is connected to the surrounding part, and the first groove is spaced apart from the load-bearing area. In this way, the connecting part provides external support for the surrounding part and improves local rigidity, while avoiding the direct transfer of mechanical loads or deformation to the sealant layer. The cavity formed by the first groove can play a role in local buffering and stress release under the action of external force or thermal stress, making the sealant layer of the surrounding part and the load-bearing area more uniformly stressed, reducing stress concentration, and improving structural stability and the durability of the sealing layer. In summary, this technical solution has the advantages of strong sealing performance, high structural stability, and high durability.

[0020] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure. Attached Figure Description

[0021] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure. It is obvious that the drawings described below are merely some embodiments of this disclosure, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort. In the drawings: Figure 1 This is a schematic diagram of the battery sealing structure provided in Embodiment 1 of the present invention; Figure 2 This is a schematic diagram of the battery sealing structure provided in Embodiment 2 of the present invention; Figure 3 This is a first exploded structural diagram of the battery sealing structure provided in Embodiment 1 of the present invention; Figure 4 This is a schematic diagram of the porous pad layer in an embodiment of the present invention; Figure 5 This is a second exploded view of the battery sealing structure provided in Embodiment 1 of the present invention; Figure 6This is a top view of the battery sealing structure provided in Embodiment 1 of the present invention; Figure 7 for Figure 6 A schematic diagram of the cross-sectional structure along point AA; Figure 8 for Figure 7 Schematic diagram of the cross-sectional structure at point B; Figure 9 for Figure 7 Schematic diagram of the cross-sectional structure at point C; Figure 10 for Figure 7 Schematic diagram of the cross-sectional structure at point D; Figure 11 This is a schematic diagram of the sealing base in an embodiment of the present invention; Illustrations: 100, Battery casing; 101, Wiring channel; 110, Lower casing; 120, Top cover; 200, Surrounding part; 201, Bearing area; 300, Porous pad; 301, First clearance hole; 302, Connecting hole; 400, Sealing layer; 401, Second clearance hole; 500, Connecting part; 501, First groove; 5011, Transition edge; 5012, Deformation gap; 502, Vent hole; 600, Sealing part; 610, Sealing base; 611, Sealing cylinder; 612, Sealing deformation part; 613, Sealing part; 614, Sealing hole; 6141, First wall surface; 6142, Second wall surface; 620, Sealing movable part; 621, Movable plate; 622, Pushing part; 623, Pinhole part. Detailed Implementation

[0022] To make the objectives, features, and advantages of this invention more apparent and understandable, the technical solutions of the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described below are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0023] In the description of this invention, it should be understood that the terms "upper," "lower," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. It should be noted that when a component is considered to be "connected" to another component, it can be directly connected to the other component or there may be a component positioned centrally in the connection.

[0024] Example 1: This embodiment provides a battery sealing structure, primarily applicable to energy storage batteries, power batteries, power modules, and enclosed battery housings requiring external cable connections. It is particularly suitable for cable-carrying areas where sealing performance, structural stability, and long-term durability must be simultaneously ensured. Since battery cells, sampling components, or electrical connection components are typically installed inside the battery housing 100, an opening structure is needed to allow conduction between the cable and external equipment, along with sealant for sealing. Existing technical solutions are prone to sealant cracking, delamination, localized collapse, or stress concentration under long-term thermal cycling, vibration, and cable displacement, leading to decreased sealing performance. The technical solution provided in this embodiment, through structural improvements, ensures sealing performance in cable-carrying areas while also considering structural support, buffering performance, and long-term stability. It boasts advantages such as strong sealing, good vibration resistance, strong thermal cycling resistance, and high structural reliability.

[0025] In this embodiment, as Figure 1 and Figure 3 As shown, this embodiment provides a battery sealing structure, which is disposed on a battery housing 100. A wire passage 101 is formed on the battery housing 100, allowing cables to pass through the battery housing 100 outwards. The battery sealing structure includes a surrounding portion 200, a porous pad 300, a sealant layer 400, and a connecting portion 500. The surrounding portion 200 protrudes along a first direction from the outer surface of the battery housing 100 and surrounds the wire passage 101, leaving a bearing area 201 between itself and the edge of the wire passage 101. The porous pad 300 is disposed on the bearing area 201. The sealant layer 400 is disposed on the porous pad 300. The connecting portion 500 is disposed on the outer surface of the battery housing 100 and has a first groove 501 formed along the first direction. The first direction is perpendicular to the surface of the battery housing 100. In this configuration, along the first direction, the projection of the connecting portion 500 is connected to the projection of the surrounding portion 200, and the first groove 501 is spaced apart from the bearing area 201. The connection of the projections means that when viewed along the first direction, the connecting portion 500 and the surrounding portion 200 at least partially overlap.

[0026] Specifically, the surrounding portion 200 protrudes along the first direction onto the outer surface of the battery housing 100 and surrounds the wiring channel 101, forming a bearing space with limiting boundaries around the wiring area. This confines the subsequently installed pore pad layer 300 and sealant layer 400 within a relatively stable area, preventing the sealing material from diffusing, collapsing, or shifting during potting or long-term use, thereby improving the overall molding stability of the wiring area. Simultaneously, the protruding structure formed by the surrounding portion 200 also enhances the local structural strength of the wiring area, making the area around the wiring channel 101 less prone to edge warping or localized pressure deformation due to housing deformation. Meanwhile, a porous pad 300 is disposed on the bearing area 201, allowing the sealant layer to form an indirect support relationship with the battery casing 100 through the porous pad 300. Because the porous pad 300 possesses a certain porosity and elastic deformation capability, when the cable deforms due to thermal expansion, vibration, shaking, or slight displacement, the porous pad 300 can absorb some of the mechanical stress through its own compression, rebound, or local buffering, thereby reducing the direct transmission of stress to the sealant layer 400 and lowering the risk of cracking, delamination, or interface peeling of the sealant layer 400 due to long-term stress concentration. Furthermore, the porous structure can improve the bonding stability between the sealant layer 400 and the porous pad 300, allowing the sealant layer 400 to form a more stable adhesion state after curing, thus improving the long-term sealing reliability of the cable passage area. Based on this, the connecting part 500 is disposed on the outer surface of the battery housing 100 and forms a local cavity structure through the first groove 501. Since the projection of the connecting part 500 is connected to the projection of the surrounding part 200, the connecting part 500 can form an outer support for the surrounding part 200, improve the overall rigidity of the periphery of the wire passing area, and reduce the possibility of local deformation of the surrounding part 200 under stress. At the same time, the first groove 501 is spaced apart from the bearing area 201, so that the first groove 501 forms a buffer area independent of the sealing area. When the battery housing 100 is subjected to thermal stress, assembly stress or external impact, the first groove 501 can provide local deformation space to release some structural stress and avoid stress being directly concentrated and transmitted to the bearing area 201 and the sealing layer 400 area, thereby reducing the probability of stress concentration in the sealing area.

[0027] As can be seen, in this embodiment, a porous pad 300 and a sealant layer 400 are sequentially arranged in the bearing area 201. The porous pad 300 provides support and buffering, while the sealant layer 400 is indirectly placed on the battery casing surface. The porous pad 300 can absorb the deformation of the cable caused by thermal expansion, vibration, or slight displacement, making the stress transmission between the sealant layer 400 and the cable and casing more moderate, reducing the risk of cracking or detachment of the sealant layer 400. Furthermore, the connecting part 500 provides external support for the surrounding part 200 and improves local rigidity while avoiding direct transmission of mechanical loads or deformation to the sealant layer 400. The cavity formed by the first groove 501 can act as a local buffer and stress release under external force or thermal stress, making the force on the sealant layer 400 of the surrounding part 200 and the bearing area 201 more uniform, reducing stress concentration, and improving structural stability and the durability of the sealing layer. In summary, this technical solution has the advantages of strong sealing performance, high structural stability, and high durability.

[0028] Furthermore, such as Figure 3 As shown, the edge of the cable passage 101 and the surrounding portion 200 are equally spaced, making the bearing area 201 annular. The porous pad 300 is stacked on the bearing area 201. A portion of the porous pad 300 covers the bearing area 201 along the first direction, and another portion of the porous pad 300 covers the top of the cable passage 101 along the first direction. A first clearance hole 301 is provided at the position of the cable. It should be explained that the top of the cable passage 101 in this embodiment refers to the side of the cable passage 101 where the porous pad 300 is provided. The porous pad 300 covers the top of the cable passage 101 along the first direction, which means that the cable passage 101 coincides with the porous pad 300 along the first direction. The annular arrangement of the bearing area 201 and the covering structure of the porous pad 300 over the cable passage 101 not only improve the stress uniformity and sealing integrity of the cable passage area, but also enhance the buffering capacity and long-term stability of the cable passage area, thereby giving the battery sealing structure better sealing performance, vibration resistance, and durability. Furthermore, the aforementioned arrangement allows the porous pad 300 to not only provide buffer support for the outer area of ​​the cable passage 101, but also directly cover the opening area of ​​the cable passage 101, thereby reducing the exposed gap between the cable passage 101 and the cable, and improving the overall sealing effect of the cable passage area.

[0029] As an alternative implementation, the bearing area 201 can take other shapes, such as having a wavy outline along the edge of the wire passage 101; for example, multiple spaced protrusions can be provided on the edge of the wire passage 101 to support the porous pad 300.

[0030] Furthermore, the sealant layer 400 is formed in the surrounding part 200 by potting adhesive. The sealant layer 400 is connected to the pore pad layer 300 and the inner wall surface of the surrounding part 200 respectively. The sealant layer 400 is provided with a second clearance hole 401 corresponding to the position of the cable. The sealant layer 400 does not extend beyond the surrounding part 200 in the first direction.

[0031] Specifically, the sealant layer 400 is molded within the surrounding portion 200 through potting, allowing the surrounding portion 200 to form an outer perimeter limiting the sealant material in the potted state. This ensures that the sealant layer 400 remains within a predetermined area during curing, preventing overflow, spillage, or uneven accumulation of the sealant, thereby improving the molding consistency and structural stability of the sealant layer 400. Simultaneously, the enclosure structure formed by the surrounding portion 200 also enhances the bonding stability between the sealant layer 400 and the battery casing 100, providing a more complete boundary support effect to the sealed area. Furthermore, the sealant layer 400 is connected to the inner wall surfaces of the porous pad layer 300 and the surrounding portion 200, respectively, so that after curing, the sealant layer 400 forms an integral connection structure with the porous pad layer 300 and the surrounding portion 200. On the one hand, after the sealant layer 400 is connected to the porous pad layer 300, it can form an interlocking adhesion relationship by utilizing the porous structure of the porous pad layer 300, thereby improving the adhesion stability of the sealant layer 400 and reducing local tensile stress caused by cable displacement, thermal expansion, or vibration. On the other hand, after the sealant layer 400 is connected to the inner wall surface of the surrounding portion 200, the surrounding portion 200 can provide lateral support to the sealant layer 400, thereby limiting the sealant layer 400 from edge peeling, lifting, or local delamination under long-term stress, thus improving the overall stability and durability of the sealing area. Therefore, the cooperative structure between the sealant layer 400, the surrounding part 200, and the porous pad layer 300 can not only improve the molding stability and adhesion reliability of the sealing area, but also take into account the buffering requirements when the cable moves, thus giving the battery sealing structure better sealing performance, fatigue resistance and long-term service stability.

[0032] Furthermore, such as Figure 3 and Figure 4 As shown, the porous pad 300 also has a connecting hole 302 along the first direction. Along the first direction, one end of the projection of the connecting hole 302 is connected to the projection of the first clearance hole 301, and the other end of the projection of the connecting hole 302 extends to the edge of the porous pad 300. It should be further noted that, along the projection of the first direction, the outline of the connecting hole 302 is elongated. One end of the connecting hole 302 is connected to the first clearance hole 301, and the other end of the connecting hole 302 penetrates the porous pad 300. In addition, both the first clearance hole 301 and the connecting hole 302 penetrate the porous pad 300 along the first direction.

[0033] The elongated connecting hole 302 has a certain deformation adaptability, allowing the porous pad 300 to adapt to cable position deviations, thereby improving structural compatibility. Simultaneously, the through-type structure enables the porous pad 300 to form a more flexible buffer space around the cable when the cable is affected by thermal expansion, vibration, or swaying, thus mitigating the localized stress transmission from the cable to the porous pad 300 and sealant layer 400, improving the long-term stability of the sealing area. For example, when the cable undergoes slight displacement, the area corresponding to the connecting hole 302 can release some deformation stress through its own opening structure, thereby reducing stress concentration at the edge of the first clearance hole 301 and preventing the porous pad 300 from cracking or fatigue damage due to long-term stress.

[0034] Based on the above embodiments, the battery housing 100 includes a lower housing 110 and a top cover 120 mounted on the lower housing 110; a wire passage 101 is formed on the lower housing 110; the number of connecting portions 500 is several, and at least one connecting portion 500 is disposed at the end of the wire passage 101 facing the top cover 120. In this embodiment, as... Figure 1 As shown, there is one connecting part 500, and one connecting part 500 is provided at one end of the wire passage 101 facing the top cover 120.

[0035] In this embodiment, the battery housing 100 adopts a split structure of a lower housing 110 and a top cover 120, allowing the internal space of the battery to be sealed by the top cover 120, and the wiring channel 101 to be arranged on the lower housing 110. The connecting part 500 is located at the end of the wiring channel 101 facing the top cover 120, which enables a more stable outer support boundary to be formed on the side of the wiring area near the housing splicing position. Since the area between the top cover 120 and the lower housing 110 is a relatively active area in the battery housing, assembly tolerances are more likely to accumulate in this area. The connecting part 500 can provide structural constraints to this area, making the stress state around the periphery of the surrounding part 200 more uniform, thereby improving the long-term adhesion stability of the porous pad layer 300 and the sealant layer 400, and enabling the wiring area to maintain good sealing performance and structural durability under long-term thermal cycling, vibration and cable swing conditions.

[0036] Based on the above embodiment, a ventilation hole 502 is provided on the bottom wall of the first groove 501, and the ventilation hole 502 extends to the inner wall surface of the lower housing 110; a sealing part 600 is movably installed in the groove of the first groove 501, and the sealing part 600 is configured in a first state and a second state; as Figures 6 to 9 As shown, when the sealing part 600 is in the first state, the vent 502 is blocked; when the sealing part 600 is in the second state, the vent 502 connects the lower housing 110 with the outside.

[0037] In this embodiment, a ventilation hole 502 is provided on the bottom wall of the first groove 501, and the ventilation hole 502 extends to the inner wall of the lower housing 110, so that the ventilation hole 502 can serve as a gas conduction path between the inside and outside of the lower housing 110. Based on this structure, when the battery housing 100 needs to be injected with nitrogen, inert protective gas or dry gas after production and assembly, the external protective gas can enter the interior of the lower housing 110 through the ventilation hole 502, thus eliminating the need to set up a separate gas filling interface at other locations on the housing, thereby reducing the impact of additional openings on the structural integrity and sealing of the housing. At the same time, since the ventilation hole 502 is located on the bottom wall of the first groove 501, the protective gas can enter the interior of the housing along the corresponding area of ​​the connecting part 500, so that the airflow first passes through the buffer cavity formed by the first groove 501 before entering the internal space of the battery, thereby reducing the direct impact of high-speed airflow on the pore pad layer 300, the sealant layer 400 and the wiring area, and avoiding the problem of uneven stress on the sealing layer caused by a sudden increase in local pressure during the gas injection process. For example, when protective gas needs to be injected into the casing, the sealing part 600 can be in the second state. In this state, the vent 502 connects the lower casing 110 to the outside, allowing external protective gas to continuously enter the casing and expel existing air, moisture, or volatile gases, thereby reducing the oxygen and moisture content inside the battery and improving the stability of the internal environment. This reduces the problems of oxidation, corrosion, or insulation degradation caused by internal moisture to the cells, electrical connectors, and circuit structures, improving the long-term reliability and safety of the battery module. After the protective gas injection is completed, the sealing part 600 can switch to the first state, sealing the vent 502 and retaining the protective gas injected into the lower casing 110 inside the casing, preventing continuous leakage. Since the sealing part 600 is a movable structure, it can form a conductive path during the gas injection stage and a sealing blockage during the working stage, allowing the same structure to simultaneously perform gas injection and long-term sealing functions. This reduces the need for additional independent sealing components or subsequent secondary sealing processes, thereby improving assembly convenience and structural integration.

[0038] Furthermore, the sealing part 600 includes a sealing base 610 and a sealing movable part 620. The sealing movable part 620 can move between a first position and a second position. When the sealing movable part 620 is in the first position, the sealing part 600 is in the first state; when the sealing movable part 620 is in the second position, the sealing part 600 is in the second state.

[0039] For example, when the sealing movable part 620 is in the first position, the sealing part 600 is in the first state. At this time, the vent 502 is blocked, which can block the gas flow path between the interior of the lower housing 110 and the outside, thereby preventing external moisture, dust or corrosive media from entering the battery. Since the battery usually contains electrical connectors, cells and conductive structures, the entry of external moisture can easily lead to oxidation corrosion, decreased insulation performance or internal condensation problems. After the sealing movable part 620 forms a blocked state in the first position, it can maintain a relatively stable and dry environment inside the housing, thereby improving the reliability and safety of the battery module in long-term operation. When the sealing movable part 620 moves to the second position, the sealing part 600 is in the second state. At this time, the vent 502 connects the lower housing 110 with the outside, so that a gas exchange passage is formed inside the lower housing 110. Thus, during the production stage, nitrogen or inert protective gas can be injected into the casing through the vent 502 to replace the internal air and moisture, reducing the oxygen and moisture content inside the casing. During the usage stage, appropriate pressure relief or gas replenishment can be achieved according to changes in internal pressure, thereby mitigating pressure fluctuations during battery thermal cycling. Since the sealing movable part 620 uses a position switching method to achieve state transition, the venting operation can be completed without disassembling the overall sealing structure, thereby improving operational convenience and structural integration.

[0040] Furthermore, such as Figure 9 and Figure 11 As shown, the sealing base 610 is elastic and includes a sealing cylinder 611, a sealing deformation part 612, and a closing part 613 connected in sequence. The sealing cylinder 611 is fitted inside the first groove 501 and does not contact the bottom wall of the first groove 501. A deformation gap 5012 is left between one end of the sealing deformation part 612 and the transition edge 5011 of the first groove 501. The closing part 613 is fitted to the bottom wall of the first groove 501. There are multiple closing parts 613 and they are arranged around the ventilation hole 502 to form an openable and closable sealing hole 614. It is understandable that the sealing cylinder 611 is fitted inside the first groove 501 to provide a positioning basis for the sealing base 610; a deformation gap 5012 is left between one end of the sealing deformation part 612 and the transition edge 5011 of the first groove 501, which means that when the sealing deformation part 612 is compressed, it can deform towards the deformation gap 5012, which is manifested as moving away from the sealing hole 614, thereby driving the sealing part 613 away from the sealing hole 614, thereby increasing the diameter of the sealing hole 614.

[0041] For example, regarding the sealing hole 614, when the sealing part 600 is in the first state, each sealing deformation part 612 and the closing part 613 is in the initial state, and the multiple closing parts 613 are in a state of mutual contact, at which time the sealing hole 614 is equivalent to being closed; when the sealing part 600 is in the second state, each sealing deformation part 612 and the closing part 613 is in a pressure state, and the closing part 613 moves in a direction away from the sealing hole 614, causing the sealing hole 614 to open. On the one hand, this design ensures that the sealing hole 614 is completely closed in the first state, preventing external moisture, dust, and other impurities from entering the lower housing 110, thereby maintaining a dry and stable protective environment inside the battery housing. On the other hand, when it is necessary to inject protective gas into the housing or to regulate the pressure, the sealing movable part 620 can deform under force to drive the sealing part 613 to open the sealing hole 614, enabling the ventilation hole 502 to be open. This allows external inert gas or dry gas to be smoothly injected into the lower housing 110, while the original air and moisture are discharged, optimizing the internal environment and reducing the risks of oxidation corrosion and humidity. In addition, multiple sealing parts 613 are arranged around the ventilation hole 502 to form an openable and closable sealing hole 614, ensuring a stable and uniform gas flow path. This further prevents local airflow from impacting the sealing adhesive layer 400 and the porous pad layer 300, improving the safety and uniformity of the gas injection process. Throughout the entire operation, the elastic structure of the sealing base 610 can absorb and buffer deformation stress, reducing structural fatigue and wear, thereby improving the durability and reliability of the sealing structure.

[0042] Furthermore, such as Figures 7 to 11 As shown, the sealing movable part 620 includes a movable plate 621, which is sleeved inside the sealing cylinder 611 and slidably connected to the sealing cylinder 611. The movable plate 621 has a pushing part 622 protruding at the position corresponding to the sealing deformation part 612, and a pinhole part 623 protruding at the position corresponding to the sealing hole 614. When the sealing movable part 620 is in the second position, the sealing part 600 is in the second state. The sealing deformation part 612 is deformed by the pushing part 622 in the direction close to the deformation gap 5012, causing the sealing hole 614 to open. The pinhole part 623 is pushed by the movable plate 621 to pass through the sealing hole 614. In this embodiment, the sealing movable part 620 includes a movable plate 621, which is sleeved inside the sealing cylinder 611 and slidably connected to the sealing cylinder 611. This allows the sealing movable part 620 to move stably along a preset direction during operation, thereby avoiding problems such as offset, tilting, or partial jamming of the sealing movable part 620 during switching, thus improving the stability and reliability of the sealing structure during operation. Simultaneously, the movable plate 621 has a protruding pushing part 622 corresponding to the sealing deformation part 612, enabling the movable plate 621 to transmit force to the sealing deformation part 612 area during movement. Because a deformation gap 5012 is reserved between the sealing deformation part 612 and the transition edge 5011 of the first groove 501, when the sealing movable part 620 moves to the second position, the pushing part 622 can push the sealing deformation part 612 to undergo elastic deformation in the direction closer to the deformation gap 5012, thereby driving the closing part 613 to move in the direction away from the sealing hole 614, so that gaps are formed between the multiple closing parts 613, thereby opening the sealing hole 614. In this way, through the cooperation between the pushing part 622 and the sealing deformation part 612, the opening reliability and response stability of the ventilation structure are improved while ensuring the compactness of the structure. Meanwhile, the movable plate 621 has a protruding pinhole portion 623 corresponding to the sealing hole 614. The pinhole portion 623 is tubular. When the sealing movable part 620 is in the second position, the pinhole portion 623 is pushed by the movable plate 621 and passes through the sealing hole 614. Since the pinhole portion 623 continues to extend towards the ventilation hole 502 after the sealing hole 614 is opened, it can further guide and support the sealing hole 614, so that the multiple closed parts 613 remain stably separated in the open state, and prevent the closed parts 613 from closing prematurely due to elastic recovery. This ensures that the ventilation hole 502 remains open during the ventilation or gas injection process, and improves the gas exchange efficiency. Furthermore, the sealing part 600 disposed within the first groove 501 can further improve the stress buffering capacity of the corresponding area of ​​the first groove 501. Specifically, after further providing an elastic sealing part 600 inside the first groove 501, it means that the interior of the first groove 501 is no longer a simple rigid cavity, but forms a composite buffering system of cavity and elastic structure, thereby giving the corresponding area of ​​the first groove 501 better stress absorption and buffering capacity. Specifically, the sealing base 610 is elastic, and the sealing cylinder 611 does not contact the bottom wall of the first groove 501, so that the sealing base 610 forms a suspended support state inside the first groove 501; when the connecting part 500 is subjected to forces from shell deformation, thermal expansion or external impact, the corresponding area of ​​the first groove 501 will produce a certain local deformation, and the sealing base 610 can use its own elasticity to generate synchronous micro-deformation, thereby absorbing part of the structural load, reducing the problem of fatigue cracking or local stress accumulation at the edge of the first groove 501 due to long-term stress concentration, and improving the structural durability of the corresponding area of ​​the connecting part 500; Meanwhile, a deformation gap 5012 is left between the sealing deformation part 612 and the transition edge 5011 of the first groove 501, allowing the sealing deformation part 612 to elastically displace towards the deformation gap 5012 under stress. Thus, when the battery casing 100 experiences localized compression or tension in the connection area 500 due to thermal cycling or vibration, the sealing deformation part 612 can preferentially release some stress through its own elastic deformation, rather than rigidly transmitting the deformation to the groove wall of the first groove 501 or the surrounding area 200, thereby further mitigating the diffusion of stress towards the bearing area 201 and the sealing layer 400. In other words, the sealing part 600 not only performs a sealing function but also acts as a flexible buffer inside the first groove 501, further enhancing the elastic buffering capacity of the first groove 501 on top of its existing cavity buffering capability. Therefore, the above arrangement not only ensures the sealing performance of the battery sealing structure but also effectively improves the long-term durability and stability of the structure.

[0043] Based on the above implementation, the wall surface of the sealing hole 614 formed by the sealing part 613 includes a first wall surface 6141 and a second wall surface 6142 connected sequentially in a direction away from the sealing movable part 620; the plurality of first wall surfaces 6141 surround and form a closed portion of the sealing hole 614, and the second wall surface 6142 is arranged outward relative to the first wall surface 6141. The pinhole part 623 can first contact the corresponding area of ​​the plurality of first wall surfaces 6141. Since the first wall surfaces 6141 surround and form a closed portion of the sealing hole 614, a tight fit can be achieved between the plurality of sealing parts 613 in the sealed state, thereby improving the sealing performance of the sealing hole 614 in the closed state and reducing the risk of external gas, moisture or dust entering the interior of the lower housing 110. Furthermore, the second wall surface 6142 is arranged outward, so that the sealing hole 614 forms a flared transition structure during the opening process. When the pinhole portion 623 moves toward the sealing hole 614, the second wall surface 6142 can guide the pinhole portion 623, allowing the pinhole portion 623 to enter the sealing hole 614 more smoothly. This avoids the pinhole portion 623 directly impacting the edge of the sealing portion 613, which could cause local jamming, scratches, or uneven force, thereby improving the stability and reliability of the sealing movable portion 620 during the opening process.

[0044] Example 2: like Figure 2 As shown, this embodiment also provides another battery sealing structure, which is disposed on the battery housing 100. A wire passage 101 is formed on the battery housing 100, allowing cables to pass through the battery housing 100 outwards. The battery sealing structure includes a surrounding portion 200, a porous pad 300, a sealant layer 400, and a connecting portion 500. The surrounding portion 200 protrudes along a first direction from the outer surface of the battery housing 100 and surrounds the wire passage 101, leaving a bearing area 201 between itself and the edge of the wire passage 101. The porous pad 300 is disposed on the bearing area 201. The sealant layer 400 is disposed on the porous pad 300. The connecting portion 500 is disposed on the outer surface of the battery housing 100 and has a first groove 501 formed along the first direction. The first direction is perpendicular to the surface of the battery housing 100. In this configuration, along the first direction, the projection of the connecting portion 500 is connected to the projection of the surrounding portion 200, and the first groove 501 is spaced apart from the bearing area 201.

[0045] The edge of the cable passage 101 and the surrounding part 200 are equally spaced, making the bearing area 201 ring-shaped; the porous pad 300 is stacked on the bearing area 201, a part of the porous pad 300 covers the bearing area 201 along the first direction, and another part of the porous pad 300 covers the cable passage 101 along the first direction, and a first clearance hole 301 is opened at the position of the cable.

[0046] The porous pad 300 also has a connecting hole 302 along the first direction. Along the first direction, one end of the projection of the connecting hole 302 is connected to the projection of the first clearance hole 301, and the other end of the projection of the connecting hole 302 extends to the edge of the porous pad 300. It should be further noted that, along the first direction, the outline of the connecting hole 302 is elongated. One end of the connecting hole 302 is connected to the first clearance hole 301, and the other end of the connecting hole 302 penetrates the porous pad 300. Furthermore, both the first clearance hole 301 and the connecting hole 302 penetrate the porous pad 300 along the first direction.

[0047] The main difference between the battery sealing structure in this embodiment and that in Embodiment 1 is that there are at least two connecting portions 500, with at least one connecting portion 500 located at the other end of the wiring channel 101 away from the top cover 120. Since both connecting portions 500 are connected to the surrounding portion 200, when subjected to external vibration loads, the two connecting portions 500 can jointly provide distributed support to the surrounding portion 200, resulting in a more even distribution of stress on the load-bearing area 201 and the sealing layer 400 area, rather than concentrating on a single area. This reduces the risk of localized tearing, cracking, or peeling at the edges of the sealing layer 400, improving the stability of the sealing area under long-term thermal cycling and vibration conditions.

[0048] Meanwhile, since the connecting part 500 has a first groove 501 inside, the two connecting parts 500 can not only form double-sided support, but also provide local buffer space for their respective areas. When the wiring area is displaced due to cable thermal expansion, shell deformation, or vibration, the first grooves 501 on both sides can absorb part of the deformation in the corresponding direction, making the wiring area form a more stable stress release path, thereby reducing the direct transmission of stress to the pore pad layer 300 and the sealant layer 400. Compared with a structure with a connecting part 500 on one side, the double-sided connecting parts 500 can make the stress state of the wiring area more symmetrical, reduce structural displacement or sealant layer fatigue caused by unilateral stress, and further improve the vibration resistance and long-term durability of the battery sealing structure.

[0049] Example 3: This embodiment provides a battery module, including a battery housing 100 and a battery sealing structure disposed on the battery housing 100. The battery sealing structure adopts the battery sealing structure of Embodiment 1 or Embodiment 2. The specific structure of the battery sealing structure has been described and explained in the above embodiments, and no specific limitations are made in this embodiment. It should be added that a battery can be disposed in the battery housing 100, and the battery cable extends to the outside through the cable channel 101.

[0050] Example 4: This embodiment provides an assembly method for assembling the battery sealing structure of Embodiment 1 or Embodiment 2, including: Step S1: Pass the cable through the cable passage 101 and extend it outside the battery housing 100; Step S2: Place the porous pad 300 within the bearing area 201 of the surrounding portion 200; Step S3: Apply the sealant layer 400 onto the porous pad 300, specifically through a potting process.

[0051] More specifically, the assembly method includes: Step S1: Place the battery into the lower housing 110, pass the cable through the cable passage 101 and extend it to the outside of the battery housing 100, and install the top cover 120 on the lower housing 110. Step S2: Place the porous pad 300 in the bearing area 201 of the surrounding part 200, so that a part of the porous pad 300 covers the bearing area 201 and another part covers the wire passage 101, and let the cable pass through the first clearance hole 301. Step S3: Place the sealant layer 400 on the porous pad 300. Specifically, inject sealant into the area enclosed by the surrounding part 200 through a potting process, so that the sealant layer 400 is connected to the inner wall surface of the porous pad 300 and the surrounding part 200 respectively, and the cable is passed through the second clearance hole 401. Step S4: Curing the sealant layer 400 to form a stable connection structure between the sealant layer 400, the porous pad 300, and the surrounding part 200. Step S5: Install the sealing base 610 into the first groove 501, so that the sealing cylinder 611 is fitted into the first groove 501, and make the sealing part 613 fit against the bottom wall of the first groove 501. Step S6: Install the sealing movable part 620 into the sealing base 610, so that the movable plate 621 is sleeved in the sealing cylinder 611 and slidably connected with the sealing cylinder 611. Step S7: When it is necessary to inject protective gas into the lower housing 110, drive the sealing movable part 620 to move from the first position to the second position, so that the pushing part 622 pushes the sealing deformation part 612 to deform in the direction close to the deformation gap 5012, so that the closing part 613 is disposed away from the sealing hole 614, so as to open the sealing hole 614 and allow the pinhole part 623 to pass through the sealing hole 614. Step S8: Inject protective gas into the lower housing 110 through the ventilation hole 502. It should be noted that when there is only one connecting part 500, the inside of the housing can be evacuated through the ventilation hole 502. When there are two connecting parts 500, air can be evacuated through the ventilation hole 502 corresponding to one connecting part 500 and air can be vented through the ventilation hole 502 corresponding to the other connecting part 500. Step S9: After the protective gas injection is completed, the sealing movable part 620 is reset from the second position to the first position, the sealing deformable part 612 is restored to its initial state, and the multiple sealing parts 613 are made to abut against each other to seal the sealing hole 614 and the ventilation hole 502. Step S10: Complete the assembly of the battery sealing structure.

[0052] The above-described embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A battery sealing structure, characterized in that, The battery housing (100) is provided with, including: A cable passage (101) is provided on the battery housing (100) for allowing cables to pass out of the battery housing (100); The surrounding portion (200) protrudes along the first direction on the outer surface of the battery housing (100) and surrounds the wire passage (101), with a bearing area (201) left between it and the edge of the wire passage (101). A porous pad (300) is disposed on the bearing area (201); A sealant layer (400) is disposed on the porous pad layer (300); A connecting part (500) is provided on the outer surface of the battery housing (100) and is provided with a first groove (501) opened along the first direction. Along the first direction, the projection of the connecting portion (500) is connected to the projection of the surrounding portion (200), and the first groove (501) is spaced apart from the bearing area (201).

2. The battery sealing structure according to claim 1, characterized in that, The edge of the cable passage (101) is equally spaced from the surrounding part (200), making the bearing area (201) annular; the porous pad (300) is stacked on the bearing area (201), a part of the porous pad (300) covers the bearing area (201) along the first direction, and another part of the porous pad (300) covers the top of the cable passage (101) along the first direction, and a first clearance hole (301) is provided at the position of the cable.

3. The battery sealing structure according to claim 2, characterized in that, The sealant layer (400) is formed in the surrounding part (200) by potting. The sealant layer (400) is connected to the inner wall surface of the porous pad (300) and the surrounding part (200). The sealant layer (400) has a second clearance hole (401) at the position of the cable. The sealant layer (400) does not extend beyond the surrounding part (200) in the first direction.

4. The battery sealing structure according to claim 2, characterized in that, The porous pad (300) is further provided with a connecting hole (302) along the first direction. Along the first direction, one end of the projection of the connecting hole (302) is connected to the projection of the first clearance hole (301), and the other end of the projection of the connecting hole (302) extends to the edge of the porous pad (300).

5. A battery sealing structure according to claim 4, characterized in that, The battery housing (100) includes a lower housing (110) and a top cover (120) mounted on the lower housing (110); the wiring channel (101) is formed on the lower housing (110); The number of the connecting parts (500) is several, and at least one of the connecting parts (500) is disposed at one end of the wire passage (101) facing the top cover (120).

6. The battery sealing structure according to claim 5, characterized in that, The number of the connecting parts (500) is at least two, and at least one of the connecting parts (500) is located at the other end of the wire passage (101) away from the top cover (120).

7. A battery sealing structure according to claim 5, characterized in that, The bottom wall of the first groove (501) is provided with a ventilation hole (502), which extends to the inner wall of the lower housing (110); a sealing part (600) is movably installed in the first groove (501), and the sealing part (600) is configured in a first state and a second state. When the sealing part (600) is in the first state, the ventilation hole (502) is blocked; when the sealing part (600) is in the second state, the ventilation hole (502) connects the lower housing (110) with the outside.

8. A battery sealing structure according to claim 7, characterized in that, The sealing part (600) includes a sealing base (610) and a sealing movable part (620). The sealing movable part (620) can move between a first position and a second position. When the sealing movable part (620) is in the first position, the sealing part (600) is in a first state; when the sealing movable part (620) is in the second position, the sealing part (600) is in a second state.

9. A battery sealing structure according to claim 8, characterized in that, The sealing base (610) is elastic and includes a sealing cylinder (611), a sealing deformation part (612), and a closing part (613) connected in sequence. The sealing cylinder (611) is fitted inside the first groove (501) and does not contact the bottom wall of the first groove (501). A deformation gap (5012) is left between one end of the sealing deformation part (612) and the transition edge (5011) of the first groove (501). The closing part (613) is fitted to the bottom wall of the first groove (501). The number of the closures (613) is multiple and arranged around the ventilation hole (502) to form an openable and closable sealing hole (614).

10. A battery sealing structure according to claim 9, characterized in that, The sealing movable part (620) includes a movable plate (621), which is sleeved inside the sealing cylinder (611) and slidably connected to the sealing cylinder (611); the movable plate (621) has a pushing part (622) protruding at the position corresponding to the sealing deformation part (612), and the movable plate (621) has a pinhole part (623) protruding at the position corresponding to the sealing hole (614). When the sealing movable part (620) is in the second position, the sealing part (600) is in the second state, the sealing deformation part (612) is deformed by the pushing part (622) in the direction close to the deformation gap (5012), causing the sealing hole (614) to open; the pinhole part (623) is pushed by the movable plate (621) to pass through the sealing hole (614).

11. A battery sealing structure according to claim 9, characterized in that, The wall surface of the sealing hole (614) formed by the closure part (613) includes a first wall surface (6141) and a second wall surface (6142) connected sequentially in a direction away from the sealing movable part (620); a plurality of first wall surfaces (6141) surround to form a closed portion of the sealing hole (614), and the second wall surface (6142) is arranged to expand outward relative to the first wall surface (6141).

12. A battery module, characterized in that, It includes a battery housing (100) and a battery sealing structure disposed on the battery housing (100) as described in any one of claims 1-11.

13. An assembly method, characterized in that, For assembling the battery sealing structure as described in any one of claims 1-11, comprising: Pass the cable through the cable passage and extend it to the outside of the battery casing; The porous padding layer is placed within the load-bearing area of ​​the surrounding part; The sealant layer is placed on the porous pad layer.

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