Waterproof breathable structure, battery module and manufacturing method of battery module

Abstract

The invention provides a waterproof breathable structure, a battery module and a manufacturing method of the battery module. The waterproof breathable structure comprises a waterproof breathable shell and a waterproof breathable film; a containing groove is formed in the waterproof breathable shell, and the containing groove is filled with a waterproof sealing rubber block, so that the waterproof breathable shell is used for being glued, sealed and fixed to the pressure relief end of the battery cell module; an air hole penetrating through the waterproof air-permeable shell and the waterproof sealing rubber block is formed in the waterproof air-permeable structure, and the air hole is used for communicating with a pressure relief hole in the pressure relief end of the battery cell module; and the waterproof breathable film covers and seals the breathable hole. The waterproof breathable structure can effectively prolong the service life of the battery module and improve the use safety of the battery module.

Description

Technical Field

[0001] This disclosure relates to the technical field of battery modules, and in particular to a waterproof and breathable structure, a battery module, and a method for manufacturing a battery module. Background Technology

[0002] In a battery module, the cell module undergoes a series of complex chemical reactions during charging and discharging, generating gas. This gas is released through the pressure relief vent of the cell module to ensure that the internal pressure remains within a stable and normal operating range, as per CN119674419A. However, this also allows external water or other conductive liquids to easily enter the cell module through the pressure relief vent, significantly increasing the risk of short circuits and thus greatly reducing the battery module's lifespan and safety. Summary of the Invention

[0003] The purpose of this disclosure is to overcome the shortcomings of the prior art and provide a waterproof and breathable structure, a battery module, and a method for manufacturing the battery module with a longer service life and greater safety.

[0004] The purpose of this disclosure is achieved through the following technical solution: A waterproof and breathable structure is used to seal the pressure relief end of a battery cell module. The waterproof and breathable structure includes a waterproof and breathable shell and a waterproof and breathable membrane. The waterproof and breathable shell has a receiving groove, which is filled with waterproof sealant blocks so that the waterproof and breathable shell can be used to adhesively seal and fix the pressure relief end of the battery cell module. The waterproof and breathable structure is provided with a vent hole that penetrates the waterproof and breathable shell and the waterproof sealant block, and the vent hole is used to communicate with the pressure relief hole of the pressure relief end of the battery cell module. The waterproof and breathable membrane is sealed over the vent holes.

[0005] In one embodiment, the waterproof and breathable membrane is sealed and fixed to one side of the waterproof and breathable shell opposite to the receiving groove.

[0006] In one embodiment, the waterproof and breathable membrane is adhesively sealed and fixed to the waterproof and breathable shell.

[0007] In one embodiment, the waterproof and breathable membrane is a thermoplastic polyurethane membrane, expanded polytetrafluoroethylene membrane, or polyvinylidene fluoride membrane.

[0008] A battery module includes a cell module and a waterproof and breathable structure as described in any of the above embodiments. The waterproof and breathable structure is sealed to the pressure relief end of the cell module. The waterproof sealant block is glued and fixed to the pressure relief end of the cell module, and the vent is connected to the pressure relief hole of the cell module.

[0009] In one embodiment, the battery module includes at least two battery cells and a sealing housing. The sealing housing forms a sealing cavity, and each battery cell is located in the sealing cavity. The waterproof and breathable shell is glued and fixed to the sealing housing by the waterproof sealing block, and the pressure relief hole is opened in the sealing housing and communicates with the sealing cavity.

[0010] In one embodiment, the waterproof and breathable shell is provided with a perforated positioning area, which is opposite to the pressure relief hole, and the pressure relief hole is corresponding to the gap between two adjacent battery cells; the vent is opened in the perforated positioning area.

[0011] In one embodiment, the punching positioning area is formed with a punching positioning groove.

[0012] In one embodiment, the inner peripheral wall of the receiving groove is formed with a positioning flange, and the waterproof and breathable shell is positioned at a preset position of the battery cell module through the positioning flange.

[0013] In one embodiment, the number of positioning flanges is multiple, and the multiple positioning flanges are evenly arranged along the inner periphery of the receiving groove.

[0014] In one embodiment, the positioning flange is an elastic positioning flange.

[0015] In one embodiment, the positioning flange is injection molded and fixed to the inner peripheral wall of the receiving groove.

[0016] In one embodiment, the horizontal thickness of the positioning flange is 1mm-2mm.

[0017] In one embodiment, the bottom of the perforated positioning groove is formed with a clearance groove, the vent hole is formed at the bottom of the clearance groove, and the waterproof and breathable membrane is adhesively fixed to the bottom of the perforated positioning groove.

[0018] In one embodiment, the waterproof and breathable shell is made of a transparent material.

[0019] A method for manufacturing a battery module, used to manufacture the battery module described in any of the above embodiments, the manufacturing method comprising: Apply adhesive to the receiving groove of the waterproof and breathable shell; Position the waterproof and breathable shell relative to the battery cell module; The waterproof and breathable shell is installed at a preset position on the battery cell module, so that the adhesive in the receiving groove fills the gap between the inner wall of the receiving groove and the outer wall of the battery cell module and cures to form a waterproof sealing block. The waterproof and breathable shell is drilled by drilling the waterproof and breathable shell, the waterproof sealing block and the sealing shell in sequence using a drill bit; The waterproof and breathable membrane is attached to a predetermined position on the waterproof and breathable shell, so that the waterproof and breathable membrane seals over the vent.

[0020] Compared with the prior art, this disclosure has at least the following advantages: 1. The aforementioned waterproof and breathable structure, due to the presence of a receiving groove in the waterproof and breathable shell, is filled with waterproof sealant blocks. This allows the waterproof and breathable shell to be adhesively and sealed to the pressure relief end of the battery cell module, preventing external water or other conductive liquids from entering the receiving groove through the gap between the waterproof and breathable shell and the battery cell module. It also prevents external water or other conductive liquids from entering the battery cell module through the pressure relief hole at the pressure relief end, greatly reducing the risk of short circuits in the battery module. At the same time, the waterproof and breathable shell also protects the battery cell module, improves its structural strength, and thus greatly improves the service life and safety of the battery module.

[0021] 2. Because the waterproof and breathable structure has vents that penetrate the waterproof and breathable shell and the waterproof sealing block, and these vents are used to connect with the pressure relief hole at the pressure relief end of the battery cell module, the waterproof and breathable membrane is sealed over the vents. The waterproof and breathable membrane has good waterproof and breathable properties, which can not only effectively prevent external water or other conductive liquids from entering the battery cell module through the vents, but also allow the gas generated by the battery cell module to be discharged into the external environment through the vents. This effectively prevents the battery cell module from expanding or even exploding due to excessive gas pressure, thereby greatly improving the safety and service life of the battery module. Attached Figure Description

[0022] To more clearly illustrate the technical solutions of the embodiments of this disclosure, the accompanying drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of this disclosure and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of a waterproof and breathable structure according to one embodiment; Figure 2 for Figure 1 A partial structural diagram of the waterproof and breathable structure shown; Figure 3 for Figure 2 A partially enlarged schematic diagram of the waterproof and breathable structure shown; Figure 4 for Figure 1Another partial structural diagram of the waterproof and breathable structure shown; Figure 5 This is a schematic diagram of the structure of a battery cell module according to one embodiment; Figure 6 This is a schematic diagram of a waterproof and breathable structure.

[0024] Reference numerals: Waterproof and breathable structure 10; Waterproof and breathable shell 101; Receiving groove 1011; Breathing hole 1012; Drilled positioning area 1013; Drilled positioning groove 1014; Alternating groove 10141; Positioning flange 1015; Guide slope 10151; Waterproof and breathable membrane 102; Battery cell module 20; Pressure relief hole 201; Battery cell 202; Sealed shell 203; Sealed cavity 2031. Detailed Implementation

[0025] To facilitate understanding of this disclosure, a more complete description will be given below with reference to the accompanying drawings, which illustrate preferred embodiments of the present disclosure. However, this disclosure can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure.

[0026] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly attached to the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0027] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of this disclosure. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0028] To better understand the technical solutions and beneficial effects of this disclosure, the following detailed description is provided in conjunction with specific embodiments: like Figures 1 to 6As shown, a waterproof and breathable structure 10 in one embodiment is used to seal the pressure relief end of the battery cell module 20. The waterproof and breathable structure 10 includes a waterproof and breathable shell 101 and a waterproof and breathable membrane 102. The waterproof and breathable shell 101 has a receiving groove 1011, which is filled with a waterproof sealant block (not shown) so that the waterproof and breathable shell 101 can be glued and sealed to the pressure relief end of the battery cell module 20. This prevents external water or other conductive liquids from entering the receiving groove 1011 through the gap between the waterproof and breathable shell 101 and the battery cell module 20. It also prevents external water or other conductive liquids from entering the interior of the battery cell module 20 through the pressure relief hole 201 at the pressure relief end of the battery cell module 20, thereby greatly reducing the risk of short circuit in the battery module. At the same time, the waterproof and breathable shell 101 can also protect the battery cell module 20, improve the structural strength of the battery cell module 20, and thus greatly improve the service life and safety of the battery module.

[0029] like Figures 1 to 6 As shown, the waterproof and breathable structure 10 further includes a vent 1012 that penetrates the waterproof and breathable shell 101 and the waterproof sealant block. The vent 1012 is connected to the pressure relief hole 201 at the pressure relief end of the battery cell module 20. The waterproof and breathable membrane 102 covers and seals the vent 1012. The waterproof and breathable membrane 102 has good waterproof and breathable properties, which can not only effectively prevent external water or other conductive liquids from entering the interior of the battery cell module 20 through the vent 1012, but also allow the gas generated by the battery cell module 20 to be discharged to the external environment through the vent 1012. This effectively prevents the battery cell module 20 from expanding or even exploding due to excessive gas pressure, thereby greatly improving the safety and service life of the battery module.

[0030] The aforementioned waterproof and breathable structure 10, because the waterproof and breathable shell 101 forms a receiving groove 1011, and the receiving groove 1011 is filled with waterproof sealant blocks, allows the waterproof and breathable shell 101 to be used for adhesive sealing and fixing to the pressure relief end of the cell module 20. This prevents external water or other conductive liquids from entering the receiving groove 1011 through the gap between the waterproof and breathable shell 101 and the cell module 20, and prevents external water or other conductive liquids from entering the interior of the cell module 20 from the pressure relief hole 201 at the pressure relief end of the cell module 20. This greatly reduces the risk of short circuits in the battery module. At the same time, the waterproof and breathable shell 101 can also protect the cell module 20, improve the structural strength of the cell module 20, and thus greatly improve the service life and safety of the battery module.

[0031] Furthermore, the waterproof and breathable structure 10 is provided with a vent 1012 that penetrates the waterproof and breathable shell 101 and the waterproof sealant block. The vent 1012 is used to communicate with the pressure relief hole 201 at the pressure relief end of the cell module 20. The waterproof and breathable membrane 102 covers and seals the vent 1012. The waterproof and breathable membrane 102 has good waterproof and breathable properties. It can not only effectively prevent external water or other conductive liquids from entering the interior of the cell module 20 through the vent 1012, but also allow the gas generated by the cell module 20 to be discharged to the external environment through the vent 1012. This effectively prevents the cell module 20 from expanding or even exploding due to excessive gas pressure, thereby greatly improving the safety and service life of the battery module.

[0032] like Figures 1 to 4 As shown, in one embodiment, the vent 1012 is provided on the waterproof and ventilated shell 101 after the waterproof sealant block is glued and sealed to the battery cell module 20. During the assembly of the waterproof and ventilated structure 10, firstly, the receiving groove 1011 of the waterproof and ventilated shell 101 is filled with waterproof sealant block; then, the waterproof and ventilated shell 101 is installed on the pressure relief end of the battery cell module 20, so that the waterproof and ventilated shell 101 can be fixed to the pressure relief end of the battery cell module 20 by the waterproof sealant block, while simultaneously allowing the waterproof sealant block to fill the gap between the inner peripheral wall of the sealing receiving groove 1011 and the outer peripheral wall of the battery cell module 20; finally, the vent 1012 is provided on the waterproof and ventilated shell 101, and the vent 1012 penetrates through the waterproof sealant block, and the vent 1012 is also connected to the pressure relief hole 201, thus preventing both waterproofing and ventilation. When the receiving groove 1011 of the shell 101 is filled with waterproof sealant, the waterproof sealant block will block the vent hole 1012. It also avoids the phenomenon that the waterproof sealant block will block the pressure relief hole 201 of the cell module 20 when the waterproof vent shell 101 is sealed and fixed with waterproof sealant. This ensures that both the vent hole 1012 and the pressure relief hole 201 can remain unobstructed, so that the gas in the cell module 20 can be smoothly discharged through the vent hole 1012. This prevents the cell module 20 from expanding or even exploding due to excessive internal air pressure, thereby further improving the safety and service life of the battery module. In other embodiments, the vent hole 1012 may also be opened in the waterproof and ventilated shell 101 before the waterproof sealant block is glued and sealed to the battery cell module 20, and then a second hole may be drilled after the waterproof sealant block is glued and sealed to the battery cell module 20, so that the vent hole 1012 also penetrates the waterproof sealant block and is used to communicate with the pressure relief hole 201.

[0033] like Figures 1 to 4As shown, in one embodiment, the waterproof and breathable membrane 102 is sealed and fixed to one side of the waterproof and breathable shell 101 away from the receiving groove 1011, so as to facilitate the installation of the waterproof and breathable membrane 102, reduce the difficulty of battery module production, and thus improve the production efficiency of battery module.

[0034] like Figure 1 As shown, in one embodiment, the waterproof and breathable membrane 102 is glued and sealed to the waterproof and breathable shell 101 to facilitate the installation and removal of the waterproof and breathable membrane 102, reduce the difficulty of replacing the waterproof and breathable membrane 102, and not only reduce the production difficulty of the battery module, but also reduce the maintenance difficulty of the battery module.

[0035] like Figure 1 As shown, in one embodiment, the waterproof and breathable membrane 102 is a thermoplastic polyurethane membrane, expanded polytetrafluoroethylene membrane, or polyvinylidene fluoride membrane, so that the waterproof and breathable membrane 102 has good waterproof and breathable performance, and at the same time, it also has good anti-corrosion performance, thereby improving the service life and stability of the battery module.

[0036] This disclosure also provides a battery module, including a cell module 20 and a waterproof and breathable structure 10 as described in any of the above embodiments. The waterproof and breathable structure 10 is sealed and fixed to the pressure relief end of the cell module 20. A waterproof sealant block is glued and sealed to the pressure relief end of the cell module 20, and the vent 1012 is connected to the pressure relief hole 201 of the cell module 20.

[0037] like Figure 2 and Figure 5 As shown, in one embodiment, the battery module 20 includes at least two battery cells 202 and a sealing housing 203. The sealing housing 203 forms a sealing cavity 2031, and each battery cell 202 is located inside the sealing cavity 2031, so that the housing can seal and protect the battery cell 202, thereby improving the structural strength of the battery cell 202 and thus improving the service life of the battery module 20. The waterproof and breathable shell 101 is glued and fixed to the sealing housing 203 by waterproof sealant blocks, and the pressure relief hole 201 is opened in the sealing housing 203 and is connected to the sealing cavity 2031, so that the gas generated by the battery cell 202 can be discharged through the pressure relief hole 201, preventing the battery module 20 from expanding or even exploding due to excessive internal air pressure, thereby improving the safety and service life of the battery module.

[0038] like Figures 2 to 5As shown, in one embodiment, the waterproof and breathable shell 101 is provided with a punching positioning area 1013, which is opposite to the pressure relief hole 201. The pressure relief hole 201 is also corresponding to the gap between two adjacent battery cells 202. The vent hole 1012 is opened in the punching positioning area 1013, so that the production operator can quickly determine the punching position through the punching positioning area 1013. This not only greatly reduces the punching difficulty of the vent hole 1012, but also avoids damage to the battery module or even damage to the battery cell 202 during the punching process, thereby greatly improving the production efficiency and production quality of the battery module.

[0039] like Figures 2 to 5 As shown, in one embodiment, the punching positioning area 1013 is formed with a punching positioning groove 1014, so that the punching positioning groove 1014 can quickly guide the production worker to determine the punching position, effectively avoiding the error caused by manual visual inspection or marking positioning. This not only reduces the production difficulty of the battery module, but also greatly improves the production quality of the battery module.

[0040] like Figures 2 to 5 As shown, in one embodiment, the inner peripheral wall of the receiving groove 1011 is formed with a positioning flange 1015. The waterproof and breathable shell 101 is positioned at a preset position of the cell module 20 through the positioning flange 1015, so that the waterproof and breathable shell 101 can be reliably positioned at the preset position of the cell module 20 through the positioning flange 1015, so that the drilling positioning area 1013 and the pressure relief hole 201 are aligned with each other, thereby greatly improving the drilling accuracy of the battery module and effectively avoiding the phenomenon that the cell 202 is damaged or even destroyed due to the offset or misalignment of the pressure relief hole 201 and the drilling positioning area 1013 during the vertical drilling process, thereby greatly improving the production quality of the battery module.

[0041] like Figures 2 to 5 As shown, in one embodiment, there are multiple positioning flanges 1015. The multiple positioning flanges 1015 are evenly arranged along the inner periphery of the receiving groove 1011 so that the waterproof and breathable shell 101 can be more reliably positioned at the preset position of the cell module 20. This further avoids the pressure relief hole 201 from shifting or misaligning with the drilling positioning area 1013 during the vertical drilling process of the battery module, thereby greatly improving the drilling accuracy of the battery module and thus greatly improving the production quality of the battery module.

[0042] like Figures 2 to 5As shown, in one embodiment, the positioning flange 1015 is an elastic positioning flange, so that the waterproof and breathable shell 101 can buffer and disperse the stress between the cell module 20 and the waterproof and breathable shell 101 through the elastic properties of the positioning flange 1015, thereby reducing the stress between the cell module 20 and the waterproof and breathable shell 101, and effectively preventing the cell module 20 and the waterproof and breathable shell 101 from being damaged or even destroyed due to large stress, thus greatly improving the service life of the battery module; at the same time, the positioning flange 1015 can also compensate for the size of the gap between the waterproof and breathable shell 101 and the cell module 20 through its own elastic properties, so that the waterproof and breathable shell 101 can adapt to the cell module 20 of different sizes through the positioning flange 1015, not only making the waterproof and breathable shell 101 reliably positioned at the preset position of the cell module 20 through the positioning flange 1015, but also improving the applicability of the waterproof and breathable structure 10.

[0043] like Figure 4 As shown, in one embodiment, the elastic positioning flange is a plastic positioning flange so that the elastic positioning flange can have better elastic properties.

[0044] like Figure 4 As shown, in one embodiment, the positioning flange 1015 is injection molded and fixed to the inner peripheral wall of the receiving groove 1011 so that the positioning flange 1015 can be securely fixed to the waterproof and breathable shell 101.

[0045] like Figure 4 As shown, in one embodiment, the horizontal thickness of the positioning flange 1015 is 1mm-2mm, which not only enables the positioning flange 1015 to have good structural strength, but also enables the waterproof and breathable shell 101 to maintain good verticality when installed on the cell module 20, thereby improving the drilling accuracy of the battery module.

[0046] like Figure 4 As shown, in one embodiment, a guide slope 10151 is formed on the side of the positioning flange 1015 away from the receiving groove 1011. The guide slope 10151 extends obliquely away from the bottom of the receiving groove 1011, so that when the cell module 20 is installed in the receiving groove 1011 of the waterproof and breathable shell 101, the cell module 20 can be quickly installed in the preset position of the receiving groove 1011 by the guide of the guide slope 10151, which greatly reduces the difficulty of alignment between the cell module 20 and the receiving groove 1011, thereby greatly improving the production efficiency of the battery module.

[0047] like Figure 4 As shown, in one embodiment, the inclination angle between the guide slope 10151 and the inner peripheral wall of the receiving groove 1011 is 15°~30°.

[0048] It is understandable that when drilling vent holes 1012 on the waterproof and breathable shell 101, burrs may easily form on the part of the waterproof and breathable shell 101 located at the opening of the vent holes 1012. If the waterproof and breathable membrane 102 is directly sealed and covered at the vent holes 1012, the burrs may easily puncture the waterproof and breathable membrane 102, thereby rendering the waterproof and breathable membrane 102 ineffective. This allows external water or other conductive liquids to enter the receiving groove 1011 through the vent holes 1012 and enter the inside of the battery module 20 through the pressure relief hole 201 of the battery module 20, resulting in a short circuit in the battery module 20 and greatly reducing the production quality and service life of the battery module.

[0049] like Figures 1 to 4 As shown, in one embodiment, a clearance groove 10141 is formed at the bottom of the perforated positioning groove 1014, and a vent hole 1012 is formed at the bottom of the clearance groove 10141. The waterproof and breathable membrane 102 is glued and fixed to the bottom of the perforated positioning groove 1014 to prevent burrs at the opening of the vent hole 1012 from puncturing the waterproof and breathable membrane 102 when it is glued and fixed to the bottom of the perforated positioning groove 1014. This allows the waterproof and breathable membrane 102 to effectively prevent external water or other conductive liquids from entering the receiving groove 1011 through the vent hole 1012, thereby greatly improving the production quality and service life of the battery module.

[0050] like Figures 1 to 4 As shown, in one embodiment, the vertical distance between the bottom of the clearance groove 10141 and the bottom of the perforated positioning groove 1014 is 0.1mm-0.2mm, so as to effectively avoid the contact of burrs at the opening of the vent hole 1012 with the waterproof and breathable membrane 102.

[0051] like Figures 1 to 4 As shown, in one embodiment, the waterproof and breathable shell 101 is made of transparent material, so that production personnel can clearly see the liquid level of the adhesive in the receiving tank 1011 and the position of the adhesive injection during the assembly process and make adjustments in real time, which further improves the production quality of the battery module.

[0052] like Figures 1 to 4 As shown, in one embodiment, the waterproof and breathable shell 101 is made of acrylic, polycarbonate, transparent PPO, or transparent ABS material, so that production personnel can clearly see the liquid level and injection position of the adhesive in the receiving tank 1011 during the assembly process, while also enabling the waterproof and breathable shell 101 to have good structural strength and sealing performance.

[0053] like Figures 1 to 4 As shown, in one embodiment, the waterproof sealant block is made of epoxy resin AB glue to enable the waterproof sealant block to have better sealing performance.

[0054] This disclosure also provides a method for manufacturing a battery module, used to manufacture the battery module described in any of the above embodiments; further, the method for manufacturing the battery module includes some or all of the following steps: S10, Apply adhesive to the receiving groove 1011 of the waterproof and breathable shell 101; S20, align the waterproof and breathable shell 101 with the battery module 20; In this embodiment, the waterproof and breathable shell 101 is aligned with the battery cell module 20 to avoid misalignment of the waterproof and breathable shell 101 during installation, thereby improving the production quality of the battery module.

[0055] S30, the waterproof and breathable shell 101 is installed at the preset position of the cell module 20 so that the adhesive in the receiving groove 1011 fills the gap between the inner wall of the receiving groove 1011 and the outer wall of the cell module 20 and cures to form a waterproof sealing block. In this embodiment, the waterproof and breathable shell 101 is installed at a preset position on the cell module 20, so that the adhesive in the receiving groove 1011 fills the gap between the inner wall of the receiving groove 1011 and the outer wall of the cell module 20 and cures to form a waterproof sealant block. This prevents external water or other conductive liquids from entering the receiving groove 1011 through the gap between the waterproof and breathable shell 101 and the cell module 20, which greatly reduces the risk of short circuit in the battery module. At the same time, the waterproof and breathable shell 101 can also protect the cell module 20, improve the structural strength of the cell module 20, and thus greatly improve the service life and safety of the battery module.

[0056] S40, Drill holes in the waterproof and breathable shell 101, and drill the waterproof and breathable shell 101, waterproof sealing block and sealing shell 203 in sequence using a drill bit; In this embodiment, after the adhesive has cured to form a waterproof sealant block, a drilling operation is performed on the waterproof ventilated shell 101. The waterproof ventilated shell 101, the waterproof sealant block, and the sealing shell 203 are drilled sequentially using a drill bit. The drill bit penetrates both the waterproof ventilated shell 101 and the waterproof sealant block, creating a vent 1012 in the waterproof ventilated shell 101 that communicates with the receiving groove 1011. Furthermore, the drill bit also drills a pressure relief hole 201 in the sealing shell 203, connecting the vent 1012 with the pressure relief hole 201, so that the gas generated inside the battery cell module 20 can be released. The pressure is released into the external environment through the pressure relief hole 201 and the vent hole 1012, effectively preventing the internal expansion or even explosion of the battery cell module 20 due to excessive air pressure. At the same time, the pressure relief hole 201 is located within the receiving groove 1011, effectively preventing external water or other conductive liquids from entering the battery cell module 20 through the pressure relief hole 201. It also prevents adhesive from passing through the pressure relief hole 201 when the waterproof and ventilated shell 101 is installed at the preset position of the battery cell module 20, thereby greatly improving the safety and service life of the battery module.

[0057] S50, the waterproof and breathable membrane 102 is attached to the preset position of the waterproof and breathable shell 101, and the waterproof and breathable membrane 102 is sealed over the vent 1012.

[0058] In this embodiment, the waterproof and breathable membrane 102 is attached to a preset position on the waterproof and breathable shell 101, and the waterproof and breathable membrane 102 is sealed over the vent 1012. The waterproof and breathable membrane 102 has good waterproof and breathable properties, which can not only effectively prevent external water or other conductive liquids from entering the interior of the cell module 20 through the vent 1012, but also allow the gas generated by the cell module 20 to be discharged into the external environment through the vent 1012 and the waterproof and breathable membrane 102. This effectively prevents the cell module 20 from expanding or even exploding due to excessive air pressure, thereby greatly improving the safety and service life of the battery module.

[0059] In this embodiment, a battery module manufacturing method is used to manufacture the battery module. The steps include: first, applying adhesive to the receiving groove 1011 of the waterproof and breathable shell 101; then, aligning the waterproof and breathable shell 101 with the cell module 20; then, installing the waterproof and breathable shell 101 at a preset position on the cell module 20, so that the adhesive in the receiving groove 1011 fills the gap between the inner wall of the receiving groove 1011 and the outer wall of the cell module 20 and cures to form a waterproof sealant block; then... Then, a drilling operation is performed on the waterproof and breathable shell 101 so that the drill bit penetrates the waterproof and breathable shell 101, the waterproof sealant block and the sealing shell 203, so that the waterproof and breathable shell 101 forms a vent 1012 that communicates with the receiving groove 1011, and the battery cell module 20 forms a pressure relief hole 201 that communicates with the vent 1012; finally, the waterproof and breathable membrane 102 is attached to the preset position of the waterproof and breathable shell 101, and the waterproof and breathable membrane 102 is sealed and covered by the vent 1012.

[0060] It is understandable that during the production and transportation of the waterproof and breathable shell 101, the inner wall of the receiving tank 1011 is easily contaminated with dust. This will cause the adhesion between the adhesive and the inner wall of the receiving tank 1011 to be significantly reduced when applying adhesive, thus affecting the adhesive application effect.

[0061] In one embodiment, step S10 of applying adhesive to the receiving groove 1011 of the waterproof and breathable shell 101 includes some or all of the following steps: S11, Cleaning operation is performed on the receiving groove 1011 of the waterproof and breathable shell 101 to remove dust from the inner wall of the receiving groove 1011. In this embodiment, the receiving groove 1011 of the waterproof and breathable shell 101 is cleaned to remove dust from the inner wall of the receiving groove 1011, improve the adhesion between the adhesive and the inner wall of the receiving groove 1011, so that after the adhesive cures to form a waterproof sealing block, it can be more firmly bonded and fixed to the inner wall of the receiving groove 1011, thereby greatly improving the sealing performance between the waterproof sealing block and the inner wall of the receiving groove 1011, and thus greatly improving the production quality and usage stability of the battery module.

[0062] S12, after the waterproof and breathable shell 101 has been cleaned, the waterproof and breathable shell 101 is placed in the preset position of the glue injection equipment to perform glue injection on the receiving tank 1011.

[0063] It is understandable that during the process of applying adhesive to the receiving groove 1011 of the waterproof and breathable shell 101, if the amount of adhesive injected into the receiving groove 1011 is too small, the sealant block will not be able to completely seal and fill the gap between the inner wall of the receiving groove 1011 and the outer wall of the cell module 20. This will allow external water or other conductive liquids to easily enter the receiving groove 1011 through the gap between the inner wall of the receiving groove 1011 and the outer wall of the cell module 20. If the amount of adhesive injected into the receiving groove 1011 is too large, when the waterproof and breathable shell 101 is installed at the preset position of the cell module 20, the adhesive will overflow from the gap between the inner wall of the receiving groove 1011 and the outer wall of the cell module 20. This will not only make the adhesive easily adhere to the outer wall of the waterproof and breathable shell 101, affecting the overall appearance of the battery module, but also lead to the waste of adhesive, which will greatly reduce the user experience and the production quality of the battery module, and increase the production cost of the battery module.

[0064] In one embodiment, a clearance gap exists between the positioning flange 1015 and the cell module 20. This gap allows the cell module 20 to compress the adhesive in the receiving groove 1011 during the installation of the waterproof and breathable shell 101 onto the cell module 20. The adhesive then flows through the clearance gap into the gap between the inner peripheral wall of the receiving groove 1011 and the outer peripheral wall of the cell module 20, filling the gap. This significantly increases the bonding area between the waterproof and breathable shell 101 and the cell module 20, allowing the waterproof and breathable shell 101 to be more securely fixed to the cell module 20. It also greatly improves the sealing performance between the waterproof and breathable shell 101 and the cell module 20, thereby significantly improving the stability and production quality of the battery module.

[0065] In one embodiment, the width of the clearance gap is 0.8mm-1.2mm, which not only allows the positioning flange 1015 to reliably limit the cell module 20 to the preset position of the receiving groove 1011, but also allows the adhesive to flow smoothly through the clearance gap to the gap between the inner peripheral wall of the receiving groove 1011 and the outer peripheral wall of the cell module 20, thereby greatly improving the production quality of the battery module.

[0066] In one embodiment, the formula for calculating the amount of adhesive injected into the receiving groove 1011 of the waterproof and breathable shell 101 is as follows: Where m is the mass of the adhesive, V is the volume of the gap between the inner wall of the receiving tank 1011 and the outer wall of the cell module 20, and ρ is the density of the adhesive. This not only effectively solves the problem that the sealing block cannot completely seal and fill the gap between the inner wall of the receiving tank 1011 and the outer wall of the cell module 20 due to insufficient adhesive injection, but also avoids the problem of adhesive overflow caused by excessive adhesive injection in the receiving tank 1011. This greatly improves the user experience and the production quality of the battery module, while also significantly reducing the production cost of the battery module.

[0067] In one embodiment, the formula for calculating the volume of the gap between the inner wall of the receiving groove 1011 and the outer wall of the cell module 20 is as follows: Where V is the volume of the gap between the inner wall of the receiving groove 1011 and the outer wall of the cell module 20, L is the perimeter of the inner wall of the receiving groove 1011, h is the vertical depth from the bottom of the receiving groove 1011 to the opening of the receiving groove 1011, and c is the width of the clearance gap.

[0068] In one embodiment, after the waterproof and breathable shell 101 has been cleaned, the step S12 of placing the waterproof and breathable shell 101 at a preset position of the adhesive injection device to perform adhesive injection on the receiving groove 1011 includes some or all of the following steps: S121, the adhesive is injected into the receiving tank 1011 through the adhesive injection equipment; S122, the waterproof and breathable shell 101 is removed from the glue injection equipment, and the glue in the receiving tank 1011 is scraped and leveled so that the glue is evenly distributed in the receiving tank 1011. In this embodiment, the waterproof and breathable shell 101 is removed from the glue injection equipment, and the glue in the receiving tank 1011 is scraped and leveled to ensure that the glue is evenly distributed in the receiving tank 1011. This avoids poor adhesion and sealing between the inner wall of the receiving tank 1011 and the outer wall of the battery cell module 20 in some areas due to insufficient glue, thereby greatly improving the production quality of the battery cell module.

[0069] In one embodiment, the waterproof and breathable shell 101 is provided with a perforated positioning area 1013, which is disposed opposite to the pressure relief hole 201, and the pressure relief hole 201 is correspondingly disposed in the gap between two adjacent battery cells 202. A vent 1012 is formed in the perforated positioning area 1013. Further, step S30 of installing the waterproof and breathable shell 101 at a preset position on the battery cell module 20 includes some or all of the following steps: S31, the waterproof and breathable shell 101 is installed at the preset position of the cell module 20 so that the perforated positioning area 1013 is positioned opposite to the gap between the two adjacent cells 202.

[0070] In this embodiment, the waterproof and breathable shell 101 is installed at a preset position on the cell module 20 so that the drilling positioning area 1013 is positioned opposite to the gap between two adjacent cells 202. This allows the drill bit to sequentially drill the gap between the waterproof and breathable shell 101, the waterproof sealant block, and the sealing shell 203 between two adjacent cells 202 during the drilling operation of the waterproof and breathable shell 101, avoiding damage to the cells 202 by the drill bit, thereby improving the production quality of the battery module.

[0071] In one embodiment, step S40, which involves drilling holes in the waterproof and breathable shell 101, the waterproof sealing block, and the sealing shell 203 sequentially using a drill bit, includes some or all of the following steps: S41, align the drill bit with the drilling positioning area 1013; S42, drill the drill bit vertically into the waterproof and breathable shell 101 so that the drill bit drills the waterproof and breathable shell 101, the waterproof sealing block and the sealing shell 203 in sequence. In this embodiment, the drill bit is vertically drilled into the waterproof and ventilated shell 101, so that the drill bit sequentially drills the waterproof and ventilated shell 101, the waterproof sealant block, and the sealing shell 203. The drill bit penetrates the waterproof and ventilated shell 101 and the waterproof sealant block, so that a vent hole 1012 communicating with the receiving groove 1011 is formed at the drilling positioning area 1013. A pressure relief hole 201 is formed in the gap between two adjacent cells 202 of the sealing shell 203, so that the vent hole 1012 and the pressure relief hole 201 are connected. This not only allows the pressure relief hole 201 to be located in the receiving groove 1011, effectively preventing external water or other conductive liquids from entering the interior of the cell module 20 through the pressure relief hole 201, but also prevents adhesive from entering the interior of the sealing shell 203 through the pressure relief hole 201 when the waterproof and ventilated shell 101 is installed at the preset position of the cell module 20. At the same time, it can also prevent the drill bit from damaging the cell 202, thereby greatly improving the production quality and service life of the battery module.

[0072] Compared with the prior art, this disclosure has at least the following advantages: 1. In the aforementioned battery module, the waterproof and breathable shell 101 forms a receiving groove 1011, which is filled with waterproof sealant blocks. This allows the waterproof and breathable shell 101 to be adhesively and sealed to the pressure relief end of the cell module 20, preventing external water or other conductive liquids from entering the receiving groove 1011 through the gap between the waterproof and breathable shell 101 and the cell module 20. This also prevents external water or other conductive liquids from entering the interior of the cell module 20 through the pressure relief hole 201 at the pressure relief end of the cell module 20, greatly reducing the risk of short circuits in the battery module. At the same time, the waterproof and breathable shell 101 can also protect the cell module 20, improve the structural strength of the cell module 20, and thus greatly improve the service life and safety of the battery module.

[0073] 2. Because the waterproof and breathable shell 101 has a vent 1012 connected to the receiving groove 1011 after the waterproof sealant block is glued and sealed to the battery cell module 20, the vent 1012 penetrates through the waterproof sealant block and is connected to the pressure relief hole 201 at the pressure relief end of the battery cell module 20. This not only avoids the phenomenon of the waterproof sealant block blocking the vent 1012 when the receiving groove 1011 of the waterproof and breathable shell 101 is filled with waterproof sealant block, but also avoids the waterproof sealant block blocking the vent 1012. When the vent shell 101 seals and fixes the pressure relief end of the cell module 20 with waterproof sealant, the waterproof sealant blocks the pressure relief hole 201 of the cell module 20. This ensures that both the vent hole 1012 and the pressure relief hole 201 remain unobstructed, allowing the gas in the cell module 20 to be smoothly discharged through the vent hole 1012. This prevents the cell module 20 from expanding or even exploding due to excessive internal air pressure, thereby further improving the safety and service life of the battery module.

[0074] The embodiments described above are merely illustrative of several implementations of this disclosure, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the disclosed patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this disclosure, and these all fall within the protection scope of this disclosure. Therefore, the protection scope of this patent should be determined by the appended claims.

Claims

1. A waterproof and breathable structure (10) for sealing a pressure relief end of a cell module (20), characterized in that, The waterproof and breathable structure (10) includes a waterproof and breathable shell (101) and a waterproof and breathable membrane (102). The waterproof and breathable shell (101) has a receiving groove (1011) filled with waterproof sealant blocks so that the waterproof and breathable shell can be used to adhesively seal and fix the pressure relief end of the battery cell module (20). The waterproof and breathable structure (10) is provided with a vent (1012) that penetrates the waterproof and breathable shell (101) and the waterproof sealant block, and the vent (1012) is used to communicate with the pressure relief hole (201) of the pressure relief end of the battery cell module (20); The waterproof and breathable membrane (102) is covered and sealed to the vent (1012).

2. The waterproof, vapor-permeable structure (10) according to claim 1, characterized in that The waterproof and breathable membrane (102) is sealed and fixed to the side of the waterproof and breathable shell (101) away from the receiving groove (1011).

3. A waterproof and breathable structure (10) according to claim 1 or 2, characterized in that, The waterproof and breathable membrane (102) is adhesively and sealed to the waterproof and breathable shell (101); and / or, The waterproof and breathable membrane (102) is a thermoplastic polyurethane membrane, expanded polytetrafluoroethylene membrane, or polyvinylidene fluoride membrane.

4. A battery module, characterized by The battery module (20) includes a waterproof and breathable structure (10) as described in any one of claims 1 to 3, wherein the waterproof and breathable structure (10) is sealed to the pressure relief end of the battery module (20); the waterproof sealant block is glued and sealed to the pressure relief end of the battery module (20), and the vent (1012) is connected to the pressure relief hole (201) of the battery module (20).

5. The battery module according to claim 4, characterized in that, The battery module (20) includes at least two battery cells (202) and a sealing housing (203). The sealing housing (203) forms a sealing cavity (2031). Each battery cell (202) is located in the sealing cavity (2031). The waterproof and breathable shell (101) is glued and fixed to the sealing housing (203) by the waterproof sealing block. The pressure relief hole (201) is opened in the sealing housing (203) and is connected to the sealing cavity (2031).

6. The battery module according to claim 5, characterized in that, The waterproof and breathable shell (101) is provided with a perforated positioning area (1013), which is opposite to the pressure relief hole (201), and the pressure relief hole (201) is correspondingly provided with the gap between two adjacent battery cells (202); the vent hole (1012) is opened in the perforated positioning area (1013).

7. The battery module according to claim 6, characterized in that, The perforated positioning area (1013) has a perforated positioning groove (1014).

8. The battery module according to claim 7, characterized in that, The inner peripheral wall of the receiving groove (1011) is formed with a positioning flange (1015), and the waterproof and breathable shell (101) is positioned at a preset position of the battery cell module (20) through the positioning flange (1015).

9. The battery module according to claim 8, characterized in that, The number of the positioning flanges (1015) is multiple, and the multiple positioning flanges (1015) are evenly arranged along the inner periphery of the receiving groove (1011); and / or, The positioning flange (1015) is an elastic positioning flange; and / or, The positioning flange (1015) is injection molded and fixed to the inner peripheral wall of the receiving groove (1011); and / or, The horizontal thickness of the positioning flange (1015) is 1mm-2mm; and / or, The bottom of the perforated positioning groove (1014) is formed with a clearance groove (10141), the vent hole (1012) is formed at the bottom of the clearance groove (10141), and the waterproof and breathable membrane (102) is adhesively fixed to the bottom of the perforated positioning groove (1014); and / or, The waterproof and breathable shell (101) is made of transparent material.

10. A method for manufacturing a battery module, characterized in that, The manufacturing method for producing the battery module according to any one of claims 5 to 9 includes: Apply adhesive to the receiving groove (1011) of the waterproof and breathable shell (101); Position the waterproof and breathable shell (101) opposite to the battery cell module (20); The waterproof and breathable shell (101) is installed at a preset position of the battery cell module (20), so that the adhesive in the receiving groove (1011) fills the gap between the inner wall of the receiving groove (1011) and the outer wall of the battery cell module (20) and cures to form a waterproof sealing block. Drill holes in the waterproof and breathable shell (101) in sequence using a drill bit, and drill the waterproof and breathable shell (101), the waterproof sealant block and the sealing shell (203). The waterproof and breathable membrane (102) is attached to a predetermined position on the waterproof and breathable shell (101), and the waterproof and breathable membrane (102) is sealed over the vent (1012).

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