Waterproof lithium battery pack

Abstract

The invention relates to the technical field of battery packs, and discloses a waterproof lithium battery pack which comprises an upper cover, a lower shell and a battery cell, a peripheral connector is formed on the outer wall, close to the top surface, of the lower shell, the peripheral connector comprises an upper surrounding table surrounding the periphery of the lower shell, a gap is formed between the upper surrounding table and the outer wall of the lower shell, and a sealing seam is formed between the upper surrounding table and the outer wall of the lower shell; the lower surrounding support is located below the upper surrounding table and surrounds the periphery of the lower shell by a circle, one side edge of the lower surrounding support is seamlessly connected with the outer wall of the lower shell, and the other side edge of the lower surrounding support is seamlessly connected with one side edge, away from the top surface of the lower shell, of the upper surrounding table; the connecting cavity is formed between the bottom surface of the upper enclosing table and the inner wall of the lower enclosing support; the bottom surface of the edge of the upper cover is seamlessly connected with an isolation surrounding edge inserted into the connection cavity; a water outlet hole for communicating the connecting cavity with the external environment is formed in the lower surrounding support. When secondary sealing is achieved, residual sealant in a sealing seam is removed without hindrance, the residual problem of traditional sealant is effectively solved, the rubber ring can be modularly replaced, and the sealing performance is continuously guaranteed.

Description

Technical Field

[0001] The present application relates to the technical field of battery packs, and in particular to a waterproof lithium battery pack. Background Art

[0002] Lithium-ion battery packs typically consist of battery modules, a management system, and a protective casing. The casing often features a combined upper and lower shell structure to provide mechanical protection and environmental isolation. The joint between the upper and lower shells is crucial for ensuring the pack's waterproofing. A poor seal can allow moisture or humidity to penetrate, causing battery short circuits, corrosion, or thermal runaway, seriously impacting safety and service life. Therefore, optimizing the waterproofing design of the casing's joints is crucial to enhancing the environmental adaptability of lithium-ion battery packs.

[0003] Currently, the most common waterproofing solution is to apply sealant to the joint surface of the lower shell and then tighten the upper cover with bolts to achieve sealing. Although this method can provide good waterproofing in the short term, it has obvious defects in actual application: when the battery pack needs maintenance or replacement of internal components, removing the upper cover will cause the original sealant layer to be damaged. During reassembly, it is difficult to completely remove the residual colloid from the joint surface of the lower shell, which significantly reduces the reliability of the secondary seal. In addition, the existing technology has poor adaptability to dynamic environments such as vibration and thermal expansion and contraction, making it difficult to maintain a long-term sealing effect under complex working conditions.

[0004] Therefore, there is an urgent need for a new waterproof structure that can ensure high sealing performance while taking into account process simplicity, maintainability and long-term reliability. Summary of the Invention

[0005] The present application solves the technical problem in the prior art that the reliability of the secondary seal between the upper cover and the lower shell of the waterproof lithium battery pack is significantly reduced by providing a waterproof lithium battery pack. When the secondary seal is achieved, the residual sealant in the sealing seam can be removed without hindrance, which can effectively solve the residual problem of traditional sealant, and the rubber ring can be replaced modularly to continuously ensure the sealing performance.

[0006] The present application provides a waterproof lithium battery pack, comprising an upper cover, a lower shell and a battery cell located in the lower shell, wherein the outer wall of the lower shell near the top surface is formed with a peripheral connector, and the peripheral connector includes: an upper platform, which surrounds the outer periphery of the lower shell and is flush with the top surface of the lower shell, a gap is formed between the upper platform and the outer wall of the lower shell, and a sealing seam is formed, and a threaded hole is provided on the upper platform, and the threaded hole is located outside the sealing seam; a lower support is located below the upper platform and surrounds the outer periphery of the lower shell, one side of the lower support is seamlessly connected to the outer wall of the lower shell, and the other side is seamlessly connected to the side of the upper platform away from the top surface of the lower shell; a connecting cavity is formed between the bottom surface of the upper platform and the inner wall of the lower support; wherein the bottom surface at the edge of the upper cover is seamlessly connected with an isolation edge for passing through the sealing seam and being inserted into the connecting cavity, a through hole coaxial with the threaded hole is provided on the upper cover; and a plurality of water outlet holes are provided on the lower support for connecting the connecting cavity with the external environment.

[0007] Furthermore, a rubber ring is placed in the connecting cavity, and the rubber ring is inserted through the sealing seam. A plug-in ring groove is opened on the upper surface of the rubber ring, and the plug-in ring groove is used for inserting the isolation edge on the upper cover, and the plug-in ring groove and the isolation edge are interference fit.

[0008] Furthermore, the cross section of the lower support is V-shaped, and the bottom edge of the rubber ring abuts against the bottom of the V-shaped groove of the lower support.

[0009] Furthermore, the water outlet is close to the bottom of the V-shaped groove of the lower support, and there is a gap between the side of the rubber ring away from the lower shell and the periphery of the lower support, and the water outlet is connected to the gap.

[0010] Furthermore, a slope section is provided on one side of the bottom surface of the isolation edge facing the lower shell, and a slope surface that fits with the slope section on the isolation edge is provided in the plug-in ring groove.

[0011] Furthermore, the outer wall of the lower shell near the top surface is formed with a convex edge, the height of the convex edge is lower than the height of the top surface of the lower shell, and the upper surface of the upper platform near one side of the sealing seam is provided with a side groove, and the side groove and the upper surface of the convex edge are both used for coating sealant.

[0012] Furthermore, a groove is provided on the upper surface of the upper platform along a circle of the threaded hole, and the groove is connected to the side groove.

[0013] Furthermore, the edge of the upper cover is formed with a peripheral edge downward, and the peripheral edge is used to fit onto the outer wall of the connection between the upper enclosure platform and the lower enclosure support.

[0014] One or more technical solutions provided in this application have at least the following technical effects or advantages: 1: Due to the adoption of a three-dimensional peripheral connector structure consisting of an upper platform, a lower support and a connecting cavity, a multi-level waterproof barrier is formed. The coordinated design of the sealing seam, the side groove and the groove ensures that the sealant is evenly distributed, and a continuous and complete annular sealing layer is constructed. When the upper cover is removed and sealed again, the sealing seam is completely through the connecting cavity, and the residual sealant in the sealing seam can be removed without hindrance, which can effectively solve the problem of residual traditional sealants, and the rubber ring can be replaced modularly to continuously ensure sealing.

[0015] 2: Multiple waterproof protection mechanisms: Physical blocking, the double barrier structure of the isolation edge and the outer edge effectively blocks external liquids; chemical sealing, the sealant fills the edge groove and groove to form an integrated sealing colloid; dynamic sealing: the elastic deformation of the rubber ring adapts to the structural displacement to maintain a long-lasting seal.

[0016] 3: By utilizing the bevel section set on one side of the bottom surface of the isolation edge toward the lower shell, a slope surface is provided in the plug-in ring groove that fits with the bevel section on the isolation edge. By utilizing the bevel section, even if moisture passes over the bottom surface of the isolation edge, it needs to flow upward along the bevel section to enter the connecting surface between the upper cover and the lower shell. The setting of the bevel section further hinders the flow of moisture. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the overall structure of the waterproof lithium battery pack in the embodiment of the present application; Figure 2 This is a schematic diagram of the overall structure of the lower shell of the waterproof lithium battery pack in the embodiment of the present application; Figure 3 This is a schematic diagram of the overall structure of the upper cover of the waterproof lithium battery pack in the embodiment of the present application; Figure 4 This is a cross-sectional schematic diagram of the sealing structure between the upper cover and the lower shell in a waterproof lithium battery pack in an embodiment of the present application, in which the upper cover and the lower shell are in a sealed state; Figure 5 for Figure 4 Schematic diagram of the state where the upper cover is separated from the lower shell; In the figure: 1. Upper cover; 11. Isolation edge; 111. Inclined section; 12. Outer edge; 2. Lower shell; 21. Convex edge; 3. Battery cell; 4. Peripheral connector; 41. Upper platform; 411. Threaded hole; 412. Side groove; 413. Groove; 42. Lower support; 421. Water outlet; 43. Connecting cavity; 5. Rubber ring; 51. Plug-in ring groove; 401. Sealing seam; 101. Through hole. DETAILED DESCRIPTION

[0018] An embodiment of the present application discloses a waterproof lithium battery pack, which forms a multi-level waterproof barrier by adopting a three-dimensional peripheral connector 4 structure composed of an upper platform 41, a lower support 42 and a connecting cavity 43. When the upper cover 1 is disassembled and resealed, the sealing seam 401 between the upper platform 41 and the lower shell 2 is completely through the connecting cavity 43, and the residual sealant in the sealing seam 401 can be removed without hindrance, which can effectively solve the residual problem of traditional sealant, and the rubber ring 5 in the connecting cavity 43 can be replaced modularly to continuously ensure the sealing performance.

[0019] In order to better understand the above technical solution, the above technical solution will be described in detail below with reference to the accompanying drawings and specific implementation methods.

[0020] Reference Figure 1 , a waterproof lithium battery pack, including an upper cover 1, a lower shell 2, and a battery cell 3. The outer periphery of the top surface of the upper cover 1 is integrally formed with a peripheral connector 4. The upper cover 1 and the lower shell 2 form a closed space through the sealing structure designed by the peripheral connector 4, and the battery cell 3 is safely encapsulated in the closed space. The upper cover 1 and the lower shell 2 are both made of high-strength engineering plastics or metal materials, and the peripheral connector 4 is designed at the edge of the lower shell 2; the battery cell 3 is a lithium-ion battery pack, which is fixed inside the lower shell 2 in a modular arrangement. The sealing system between the upper cover 1 and the lower shell 2 realizes waterproof protection, ensuring that it can still effectively block the intrusion of water and moisture in harsh environments. The battery pack structure design adopts a detachable design of the upper cover 1 on the lower shell 2, which fully considers the convenience of maintenance and facilitates the inspection and replacement of the battery cell 3.

[0021] Reference Figure 2-Figure 5, the peripheral connector 4 is integrally formed on the outer wall of the lower shell 2 near the top surface, and is formed around the circumference of the lower shell 2. The peripheral connector 4 includes an upper platform 41, a lower support 42 and a connecting cavity 43. The upper platform 41 is arranged around the periphery of the lower shell 2, and the upper platform 41 is flush with the top surface of the lower shell 2. The width of the upper platform 41 is greater than the width of the top surface of the lower shell 2. The outer wall of the lower shell 2 near the top surface is formed with a convex edge 21. The height of the upper surface of the convex edge 21 is lower than the height of the top surface of the lower shell 2. The height of the lower surface of the convex edge 21 is consistent with the height of the lower surface of the upper platform 41. The width of the convex edge 21 is less than the width of the upper platform 41. A sealing seam 401 is formed between one side of the upper platform 41 near the lower shell 2 and the convex edge 21, and the sealing seam 401 is completely arranged around the circumference of the lower shell 2. As a result, the upper platform 41 and the lower shell 2 are non-connected. The bottom surface of the upper cover 1 at the edge is seamlessly connected with an isolation edge 11 for passing through the sealing seam 401. The isolation edge 11 can prevent external moisture from penetrating into the lower shell 2 over a large area. In addition, a side groove 412 is provided on the upper surface of the upper platform 41 close to the sealing seam 401. The side groove 412 is arranged around the upper platform 41. The bottom height of the side groove 412 is consistent with the height of the convex edge 21, and the width of the side groove 412 is consistent with the width of the convex edge 21. The bottom of the side groove 412 and the upper surface of the convex edge 21 are both used for coating sealant, which can make the contact surface between the upper cover 1 and the lower shell 2 have more sealant, which is beneficial to improve the sealing.

[0022] Continue to refer to Figure 2-Figure 5 A plurality of threaded holes 411 are provided around the upper platform 41, and the threaded holes 411 are located on the side of the side groove 412 away from the sealing seam 401. A plurality of through holes 101 are provided on the upper cover 1, which are coaxial with each threaded hole 411. By connecting the through holes 101 with the threaded holes 411, the upper cover 1 and the lower shell 2 can be fixedly connected. Since the position for applying the sealant is located on the inner side of the threaded hole 411, a groove 413 is provided on the upper surface of the upper platform 41 along the threaded hole 411. The groove 413 is connected to the side groove 412, and the groove 413 is also coated with sealant. This structural design achieves triple sealing protection. First, the threaded hole 411 is set on the outside of the sealant coating area, forming a protection sequence of sealing first and then fixing, which ensures both connection strength and sealing integrity. Second, a groove 413 connected to the side groove 412 is specially designed on the surface of the upper platform 41. The two together constitute a continuous sealant accommodating space, and the injected sealant can form an integrated sealing colloid. Third, the sealant extends from the side groove 412 to the groove 413, which not only seals the joint surface, but also completely wraps the threaded connection part, effectively preventing moisture from penetrating from the bolt connection, thereby constructing a multiple waterproof barrier from the inside out, significantly improving the long-term sealing reliability of the battery pack in a humid environment.

[0023] The three-dimensional peripheral connector 4 structure consisting of an upper platform 41, a lower support 42 and a connecting cavity 43 forms a multi-level waterproof barrier. The coordinated design of the sealing seam 401, the side groove 412 and the groove 413 ensures uniform distribution of the sealant and constructs a continuous and complete annular sealing layer.

[0024] Continue to refer to Figure 2-Figure 5 The lower support 42 is located below the upper platform 41 and is arranged around the periphery of the lower shell 2. One side of the lower support 42 is integrally formed with the outer wall of the lower shell 2, and the connection is located below the convex edge 21. The other side is integrally formed with the side of the upper platform 41 away from the top surface of the lower shell 2. The connecting cavity 43 is formed between the bottom surface of the upper platform 41 and the inner wall of the lower support 42. The isolation edge 11 on the upper cover 1 is inserted into the connecting cavity 43. The cross-section of the lower support 42 is V-shaped. The V-shape can better support the upper platform 41 so that the upper platform 41 can be tightened when the bolts are connected. The downward pressure has better supporting force. In addition, the threaded hole 411 on the upper platform 41 is connected to the connecting cavity 43, so that the moisture seeping from the threaded hole 411 can enter the connecting cavity 43. Thus, the connecting cavity 43 is used to provide the flow space of the moisture in the threaded hole 411, which is beneficial to reduce the flow of moisture to the connecting surface between the bottom surface of the upper cover 1 and the top surface of the lower shell 2. In addition, a number of water outlet holes 421 for connecting the connecting cavity 43 and the external environment are provided on the lower support 42. Thus, the moisture in the connecting cavity 43 can flow out through the water outlet holes 421.

[0025] Reference Figure 4 and Figure 5 A rubber ring 5 is placed in the connecting cavity 43. The rubber ring 5 is a deformable object that can be squeezed through the sealing seam 401 and placed into the connecting cavity 43. After the rubber ring 5 is placed, its bottom is in contact with the bottom of the V-shaped groove of the connecting cavity 43. The side of the rubber ring 5 close to the lower shell 2 is in conflict with the outer wall of the lower shell 2. The top surface of the rubber ring 5 is in contact with the lower surface of the convex edge 21 and the lower surface of the upper platform 41. There is a gap between the side of the rubber ring 5 facing away from the lower shell 2 and the outer wall of the connecting cavity 43, and the water outlet 421 is connected to the gap. The gap ensures that there is some space in the connecting cavity 43 to provide flow space for water in the threaded hole 411. The upper surface of the rubber ring 5 is provided with a plug-in ring groove 51. The plug-in ring groove 51 is used to insert the isolation edge 11 on the upper cover 1, and the plug-in ring groove 51 and the isolation edge 11 are interference fit. Therefore, the rubber ring 5 is used to further seal the isolation edge 11. Multiple waterproof protection mechanisms are implemented: physical blocking, the dual blocking structure of the isolation edge 11 and the outer edge 12 effectively blocks external liquids; chemical sealing, the sealant fills the edge groove 412 and the groove 413 to form an integrated sealing colloid; dynamic sealing: the elastic deformation of the rubber ring 5 adapts to the structural displacement to maintain a long-lasting seal.

[0026] Furthermore, the bottom surface of the insulating edge 11, facing the side of the lower shell 2, is provided with a sloped section 111. The insertion ring groove 51 is provided with a sloped surface that aligns with the sloped section 111 on the insulating edge 11. Due to the sloped section 111, even if water flows over the bottom surface of the insulating edge 11, it must flow upward along the sloped section 111 to enter the connection surface between the upper cover 1 and the lower shell 2. The provision of the sloped section 111 further hinders the flow of water. Furthermore, the connection cavity 43 provides space for the rubber ring 5 to compensate for thermal expansion and contraction, forming a dynamic seal.

[0027] Continue to refer to Figure 4 and Figure 5 The edge of the upper cover 1 is formed with an outer edge 12 downward, and the outer edge 12 is used to fit onto the outer wall of the connection between the upper platform 41 and the lower support 42. The outer edge 12 can prevent external moisture from entering the contact surface between the upper cover 1 and the upper platform 41, thereby further improving the sealing of the battery pack.

[0028] This application can explain its functional principles through the following operation methods: The three-dimensional peripheral connector 4 structure consisting of an upper platform 41, a lower support 42 and a connecting cavity 43 forms a multi-level waterproof barrier. The coordinated design of the sealing seam 401, the side groove 412 and the groove 413 ensures uniform distribution of the sealant and constructs a continuous and complete annular sealing layer. The connecting cavity 43 provides deformation compensation space for the rubber ring 5 due to thermal expansion and contraction.

[0029] When the upper cover 1 is disassembled and sealed again, the sealing seam 401 is completely penetrated by the connecting cavity 43, and the residual sealant in the sealing seam 401 can be removed without hindrance, which can effectively solve the residual problem of traditional sealant, and the rubber ring 5 can be replaced modularly to continuously ensure the sealing performance.

[0030] Multiple waterproof protection mechanisms: physical blocking, the dual blocking structure of the isolation edge 11 and the outer edge 12 effectively blocks external liquids; chemical sealing, the sealant fills the edge groove 412 and the groove 413 to form an integrated sealing colloid; dynamic sealing: the elastic deformation of the rubber ring 5 adapts to the structural displacement to maintain a long-lasting seal.

[0031] Drainage mechanism: The V-shaped lower support 42 is designed to guide the flow of liquid. The water outlet 421 and the connecting cavity 43 form a drainage channel to discharge the infiltrated liquid in time. The gap between the rubber ring 5 and the cavity provides flow space for the seeping water.

[0032] Obviously, those skilled in the art may make various changes and modifications to this application without departing from the spirit and scope of this application. Thus, if these modifications and variations of this application fall within the scope of the claims of this application and their equivalents, this application is intended to include these modifications and variations.

[0033] The above is only a preferred specific implementation method of the embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes based on the technical solution and concept of the present application within the technical scope disclosed in the present application, and they should be covered by the scope of protection of the present application.

Claims

1. A waterproof lithium battery pack, comprising an upper cover (1), a lower shell (2), and a battery cell (3) located in the lower shell (2), characterized in that: A peripheral connector (4) is formed on the outer wall of the lower shell (2) close to the top surface, and the peripheral connector (4) comprises: an upper platform (41) surrounding the periphery of the lower shell (2) and being flush with the top surface of the lower shell (2); a gap is provided between the upper platform (41) and the outer wall of the lower shell (2), and a sealing seam (401) is formed; a threaded hole (411) is provided on the upper platform (41), and the threaded hole (411) is located outside the sealing seam (401); A lower enclosure support (42) is located below the upper enclosure platform (41) and surrounds the periphery of the lower shell (2), one side of the lower enclosure support (42) is seamlessly connected to the outer wall of the lower shell (2), and the other side is seamlessly connected to a side of the upper enclosure platform (41) away from the top surface of the lower shell (2); A connecting cavity (43) is formed between the bottom surface of the upper enclosure platform (41) and the inner wall of the lower enclosure support (42); The bottom surface of the upper cover (1) at the edge is seamlessly connected to an isolation edge (11) for passing through the sealing seam (401) and inserted into the connecting cavity (43); a through hole (101) coaxial with the threaded hole (411) is provided on the upper cover (1); and a plurality of water outlet holes (421) for connecting the connecting cavity (43) and the external environment are provided on the lower support (42).

2. A waterproof lithium battery pack according to claim 1, characterized in that: A rubber ring (5) is placed in the connecting cavity (43), and the rubber ring (5) is placed through the sealing seam (401). A plug-in ring groove (51) is provided on the upper surface of the rubber ring (5), and the plug-in ring groove (51) is used for inserting the isolation edge (11) on the upper cover (1), and an interference fit is formed between the plug-in ring groove (51) and the isolation edge (11).

3. A waterproof lithium battery pack as claimed in claim 2, characterized in that: The cross section of the lower support (42) is V-shaped, and the bottom edge of the rubber ring (5) abuts against the bottom of the V-shaped groove of the lower support (42).

4. A waterproof lithium battery pack as claimed in claim 3, characterized in that: The water outlet hole (421) is close to the bottom of the V-shaped groove of the lower support (42), and there is a gap between the side of the rubber ring (5) facing away from the lower shell (2) and the outer periphery of the lower support (42), and the water outlet hole (421) is connected to the gap.

5. The waterproof lithium battery pack according to claim 2, characterized in that: A sloped surface section (111) is provided on one side of the bottom surface of the isolation edge (11) facing the lower shell (2), and a sloped surface that fits the sloped surface section (111) on the isolation edge (11) is provided in the plug-in ring groove (51).

6. The waterproof lithium battery pack according to claim 1, wherein: The outer wall of the lower shell (2) near the top surface is formed with a convex edge (21), the height of the convex edge (21) is lower than the height of the top surface of the lower shell (2), and the upper surface of the upper platform (41) near one side of the sealing seam (401) is provided with a side groove (412), and the side groove (412) and the upper surface of the convex edge (21) are both used for coating sealant.

7. A waterproof lithium battery pack according to claim 6, characterized in that: A groove (413) is provided on the upper surface of the upper platform (41) along the periphery of the threaded hole (411), and the groove (413) is communicated with the side groove (412).

8. The waterproof lithium battery pack according to claim 1, wherein: The edge of the upper cover (1) is formed with a peripheral edge (12) downwardly, and the peripheral edge (12) is used to fit onto the outer wall of the connection between the upper enclosure platform (41) and the lower enclosure support (42).

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