Battery module of battery car

Abstract

The invention belongs to the technical field of battery structures, and discloses a battery module of a battery car. The battery module of the battery car comprises a module shell, a sodium ion battery cell and a respirator, the respirator is fixedly arranged in the module shell, and a reusable drying agent and a waterproof breathable film are arranged in the respirator. By arranging the respirator, external air and internal air can circulate through the respirator, air pressure balance inside and outside the module shell is guaranteed, meanwhile, the reusable drying agent and the waterproof breathable film in the respirator can prevent the external air from entraining moisture and dust to enter the module shell, and therefore cleanliness in the module shell is guaranteed; and the safety of the sodium ion battery cell is ensured. Moreover, when the sodium ion battery cell works and expands, the internal air flows out through the respirator after being heated, and the reusable drying agent can be heated, so that the moisture contained in the reusable drying agent is reduced, the reusable drying agent can repeatedly absorb the moisture in the external air, and the effect of repeated moisture absorption is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of battery structures, and in particular to a battery module for an electric vehicle. Background Art

[0002] At present, the battery technology of electric vehicles is mainly divided into two categories: lead-acid batteries and lithium batteries. Lead-acid batteries occupy a place in the field of electric vehicles with their mature technology and low cost advantages, but their low energy density and short service life limit the improvement of the performance of electric vehicles. Lithium batteries are favored due to their high energy density and long cycle life, but safety issues and high costs restrict their widespread application. In this context, sodium batteries show great potential as battery materials for electric vehicles due to their abundant resources, low cost and good safety performance.

[0003] However, compared with new energy vehicles or energy storage equipment, electric vehicles have a higher risk of environmental exposure, which makes it easier for water, foreign matter, etc. to enter the electric vehicle batteries, thereby affecting the performance and safety of sodium batteries.

[0004] Therefore, there is an urgent need for a battery module for an electric vehicle to solve the above-mentioned technical problems. Summary of the invention

[0005] The object of the present invention is to provide a battery module for an electric vehicle, which can be suitable for a relatively exposed use environment and has better sealing performance.

[0006] To achieve this object, the present invention adopts the following technical solutions:

[0007] Electric vehicle battery module, including:

[0008] A module housing, wherein the module housing is provided with a first through hole;

[0009] A sodium ion battery cell, wherein the sodium ion battery cell is fixedly disposed in the module housing;

[0010] A respirator, wherein the respirator is fixedly arranged at the first perforation, and a reusable desiccant and a waterproof breathable membrane are arranged in the respirator, and external air can enter the module housing through the reusable desiccant and the waterproof breathable membrane in turn, and internal air can flow out of the module housing through the waterproof breathable membrane and the reusable desiccant in turn.

[0011] Preferably, the respirator includes a respirator cover and a respirator base, the waterproof breathable membrane is fixedly installed on the respirator base, the respirator base is sealed and inserted in the first perforation, the reusable desiccant is fixedly installed on the respirator cover, and the respirator cover can be fixedly installed on one end of the respirator base away from the module shell.

[0012] Preferably, a waterproof sealing ring is sandwiched between the respirator base and the module housing, and the respirator base is provided with a sealing slot, and the respirator upper cover is interference-fitted into the sealing slot.

[0013] Preferably, the module housing is provided with a second through hole, a waterproof threading hole plug is sealed in the second through hole, and a waterproof sealant is provided between the waterproof threading hole plug and the second through hole.

[0014] Preferably, the module shell includes a module upper shell and a module lower shell which can be snapped together up and down, and one of the module upper shell and the module lower shell is provided with a waterproof sealing groove, and a sealant is provided in the waterproof sealing groove, and the sealant is used to seal the connection between the module upper shell and the module lower shell.

[0015] Preferably, a power management component, a battery cell separator and a buffer pad are also provided in the module shell. The power management component is used to detect the working status of the battery module of the electric vehicle and includes at least one of a humidity sensor, a temperature sensor and a current and voltage sensor. The battery cell separator is sandwiched between the sodium ion battery cell and the power management component. The power management component is installed on the battery cell separator, and the buffer pad is sandwiched between the battery cell separator and the power management component.

[0016] Preferably, an electrode plate and an insulating plate are further provided in the module shell, the cell separator is provided between the electrode plate and the sodium ion cell, a plurality of the sodium ion cells are provided in the module shell and are electrically connected to the electrode plate, and the insulating plate is provided between the power management component and the electrode plate.

[0017] Preferably, the power management component further includes a data transmitter and a circuit switch, wherein the data transmitter is used to send and provide the detection result or alarm information to a user, and the circuit switch is used to power off the sodium ion battery cell.

[0018] Preferably, a buffer gasket is provided on the outer side of the lower shell of the module.

[0019] Preferably, the module housing is made of waterproof-grade halogen-free flame-retardant PBT material, and a waterproof coating is provided on the outer surface of the module housing.

[0020] The battery module of the electric vehicle provided by the present invention has the beneficial effects that by setting a respirator, the external air and the internal air can be circulated through the respirator to ensure the air pressure balance inside and outside the module housing, and at the same time, the reusable desiccant and waterproof breathable membrane in the respirator can prevent the external air from carrying moisture and dust into the module housing, thereby ensuring the cleanliness of the module housing and the safety of the sodium ion battery cell. In addition, when the sodium ion battery cell expands during operation, the internal air flows out through the respirator after being heated, and the reusable desiccant can also be heated, thereby reducing the moisture contained in the reusable desiccant, so that it can repeatedly absorb moisture from the external air, and achieve the effect of repeated moisture absorption. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is an axonometric diagram of the battery module of the electric battery vehicle provided by the present invention;

[0022] Figure 2 is an axonometric view of the upper housing of the module provided by the present invention;

[0023] Figure 3 is an axonometric view of the respirator provided by the present invention;

[0024] Figure 4 is a cross-sectional view of the respirator provided by the present invention;

[0025] Figure 5 It is an exploded view of the battery module of the electric battery vehicle provided by the present invention;

[0026] Figure 6 is an axonometric view of the lower housing of the module provided by the present invention;

[0027] Figure 7 It is an axonometric view of the battery cell separator provided by the present invention;

[0028] Figure 8 It is an axonometric diagram of the electrode plate provided by the present invention.

[0029] In the figure:

[0030] 10. Module upper housing; 101. First through hole; 102. Second through hole; 103. Bolt through hole; 104. Wire trough;

[0031] 11. Respirator; 111. Respirator base; 112. Respirator upper cover; 113. Waterproof breathable membrane; 114. Reusable desiccant; 115. Desiccant cover; 116. Waterproof sealing ring;

[0032] 12. Waterproof threading hole plug;

[0033] 20. Module lower housing; 201. Waterproof sealing groove; 202. First battery cell positioning partition; 203. Second battery cell positioning partition; 204. Partition positioning seat;

[0034] 21. First embedded round nut;

[0035] 22. Second embedded round nut;

[0036] 23. Buffer pad;

[0037] 31. First hexagon socket pan head screw;

[0038] 32. Pan head self-tapping screws;

[0039] 33. Second hexagon socket pan head screw;

[0040] 40. Power management components;

[0041] 50. Insulation board;

[0042] 60. Buffer pad;

[0043] 70, electrode plate; 701, first positioning hole; 702, second positioning hole; 703, electrode plate mounting hole;

[0044] 80, battery cell partition; 801, positioning column; 802, mounting seat; 803, mounting hole;

[0045] 90. Sodium-ion battery cell. DETAILED DESCRIPTION

[0046] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0047] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0048] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0049] In the description of this embodiment, the terms "upper", "lower", "right", "left" and other directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operate in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0050] The following is based on the attached Figure 1 To Attachment Figure 8 The present invention introduces the battery module for electric vehicle.

[0051] like Figures 1 to 3 As shown, in this embodiment, the battery module of the electric vehicle mainly includes a module shell, a sodium ion battery cell 90 and a respirator 11. A housing cavity is formed in the module shell, and the sodium ion battery cell 90 is fixedly arranged in the module shell, and can pass through the module shell through a cable or an electrode, so as to output or input electric energy. The module shell is provided with a first through hole 101, and the above-mentioned respirator 11 is fixedly arranged in the first through hole 101.

[0052] Due to the natural chemical defects of the sodium ion battery 90 in the electrolyte and electrode materials, it is extremely sensitive to changes in ambient humidity. As long as the ambient humidity fluctuates, the life and electrochemical performance of the sodium ion battery 90 will be seriously affected. Figure 3 , Figure 4As shown, the respirator 11 is provided with a reusable desiccant 114 and a waterproof breathable membrane 113. Specifically, the respirator 11 includes a respirator upper cover 112, a respirator base 111 and a desiccant cover plate 115, the waterproof breathable membrane 113 is fixedly mounted on the respirator base 111, the respirator base 111 is sealed and inserted in the first perforation 101, the reusable desiccant 114 is fixedly mounted on the respirator upper cover 112 through the desiccant cover plate 115, and the respirator upper cover 112 can be fixedly mounted on one end of the respirator base 111 away from the module housing. External air can enter the module housing through the reusable desiccant 114 and the waterproof breathable membrane 113 in turn, and internal air can flow out of the module housing through the waterproof breathable membrane 113 and the reusable desiccant 114 in turn, so that the pressure inside the module housing is in a balanced state with the external environment during the charging and discharging process and the internal temperature is in a stable range.

[0053] It should be noted that the volume change rate of the sodium ion battery 90 during operation is usually greater than that of the lithium battery. This is mainly due to the physical properties of sodium ions, whose radius is much larger than that of lithium ions. Therefore, during the battery charging and discharging process, sodium ions will cause greater volume changes when they are embedded in and out of the positive electrode material. This volume change will cause changes in the air pressure inside the module housing, which will not only affect the environmental pressure of the sodium ion battery 90, but also make it easy for leakage between the inside and outside of the module housing due to the air pressure difference.

[0054] By providing the respirator 11, the external air and the internal air can be circulated through the respirator 11 to ensure the air pressure balance inside and outside the module housing. At the same time, the reusable desiccant 114 and the waterproof breathable membrane 113 in the respirator 11 can prevent the external air from carrying moisture and dust into the module housing, thereby ensuring the cleanliness of the module housing and the safety of the sodium ion battery cell 90. In addition, when the sodium ion battery cell 90 is working and expanding, the internal air flows out through the respirator 11 after being heated, and the reusable desiccant 114 can also be heated, thereby reducing the moisture contained in the reusable desiccant 114, so that it can repeatedly absorb moisture from the external air to achieve the effect of repeated moisture absorption. Compared with traditional battery car lithium batteries or lead-acid batteries, the battery module of the battery car needs to have a more comprehensive improvement in waterproofness to offset the impact of its sensitivity to humidity changes on battery performance.

[0055] For example, during the charging and discharging process of the battery module of the electric vehicle, the sodium ion battery cell 90 expands and generates heat, and the internal air flows out through the respirator 11 after being heated. When the battery module of the electric vehicle is in a non-working state, the volume of the sodium ion battery cell 90 changes from large to small, and the outside air flows in through the respirator 11. The reusable desiccant 114 and the waterproof breathable membrane 113 prevent the outside air from carrying moisture and dust into the module housing.

[0056] Specifically, in this embodiment, the waterproof breathable membrane 113 is made of polytetrafluoroethylene with microporous membrane, so as to achieve the waterproof and breathable effect. The reusable desiccant 114 is made of bentonite, so that the internal moisture can be reduced when heated, and the reactivation treatment can be achieved, so that the reusable desiccant 114 can be recycled and reused.

[0057] Alternatively, if Figure 3 , Figure 4 As shown, in this embodiment, a buckle structure is provided at the bottom of the respirator base 111, which can buckle the respirator base 111 and the module housing when inserted into the first through hole 101. In addition, a waterproof sealing ring 116 is sleeved on the buckle structure, and the waterproof sealing ring 116 can be clamped between the respirator base 111 and the module housing, thereby sealing the first through hole 101. A sealing slot is provided at the top of the respirator base 111, and a plug-in portion is provided at the bottom end of the respirator upper cover 112, which can be plugged into the sealing slot in an interference fit, thereby fixing the respirator upper cover 112 on the respirator base 111 and making the respirator upper cover 112 and the respirator base 111 sealed. The upper cover 112 and the base 111 of the respirator are both provided with ventilation holes that pass through from top to bottom. The reusable desiccant 114 is provided in the ventilation holes of the upper cover 112 of the respirator, and the waterproof breathable membrane 113 is provided in the ventilation holes of the base 111 of the respirator, so that the internal air and the external air can pass through the reusable desiccant 114 and the waterproof breathable membrane 113 when passing through the respirator 11, thereby preventing the external air from carrying moisture and dust into the module housing and ensuring the air pressure balance inside and outside the module housing. Through the buckle structure, the plug-in part and other structures, the respirator 11 is easier to process and assemble, and has better maintainability.

[0058] Furthermore, the module housing is provided with a second through-hole 102, and a waterproof threading hole plug 12 is sealed in the second through-hole 102. A cable is passed through the waterproof threading hole plug 12, and the sodium ion battery cell 90 in the module housing can be electrically connected to the outside through the cable, and the waterproof sealing of the module housing can be ensured. Preferably, a waterproof sealant is provided between the waterproof threading hole plug 12 and the second through-hole 102, so as to further ensure the waterproof sealing of the module housing. Exemplarily, in this embodiment, a silicone rubber waterproof sealant is provided between the waterproof threading hole plug 12 and the second through-hole 102.

[0059] like Figure 5As shown, in this embodiment, the module housing includes a module upper housing 10 and a module lower housing 20. The upper portion of the module lower housing 20 is provided with an opening, and the sodium ion battery cell 90 can be installed in the module lower housing 20 through the opening, and the module upper housing 10 can be sealed and installed at the opening. A waterproof sealing groove 201 is provided on one circumferential edge of the module upper housing 10 and the module lower housing 20, and the other circumferential edge can be inserted into the waterproof sealing groove 201, so that the module upper housing 10 and the module lower housing 20 can be buckled and connected up and down.

[0060] Optionally, the upper module shell 10 and the lower module shell 20 are made of waterproof grade halogen-free flame-retardant PBT material, which has strong waterproof performance, and its mechanical strength and fire retardancy are far superior to traditional ABS materials. When the battery of the electric vehicle is subjected to a strong impact, the upper and lower shells of the battery module of the electric vehicle made of waterproof grade halogen-free flame-retardant PBT material can protect the internal sodium ion battery cell 90 from being affected to the greatest extent. Because it has stronger fire retardancy, when spontaneous combustion occurs inside, it can also isolate the spread of flames to the greatest extent, ensuring the safety of drivers and passengers. In addition, the outer surfaces of the upper module shell 10 and the lower module shell 20 are provided with an acrylic resin waterproof coating, which further improves the safety of the battery module of the electric vehicle.

[0061] Preferably, in this embodiment, the circumferential edge of the opening of the module lower housing 20 is provided with the above-mentioned waterproof sealing groove 201, and a sealant is provided in the waterproof sealing groove 201. The sealant adopts a high temperature and corrosion resistant polyurethane sealant, which is used to seal the connection between the module upper housing 10 and the module lower housing 20, thereby further ensuring the sealing between the module upper housing 10 and the module lower housing 20. Of course, in some other embodiments, the waterproof sealing groove 201 can also be provided at the circumferential edge of the module upper housing 10, which also belongs to the scope of protection of the invention.

[0062] Furthermore, if Figure 5 As shown, at least one first embedded round nut 21 is integrally formed on the module lower housing 20. Figure 2 As shown, at least one bolt through hole 103 is correspondingly provided on the upper housing 10 of the module, and two first hexagon socket pan head screws 31 can respectively pass through a bolt through hole 103 and be correspondingly installed to a first embedded round nut 21, so as to fix the upper housing 10 of the module and the lower housing 20 of the module, and cooperate with the above-mentioned waterproof sealing groove 201 and sealant to maintain a certain sealing pressure to ensure the waterproof sealing of the module housing. Optionally, a wire groove 104 is also provided on the upper housing 10 of the module to facilitate the reasonable arrangement of the cables along the wire groove 104.

[0063] like Figure 6As shown, in this embodiment, a first cell positioning partition 202 and a second cell positioning partition 203 are provided in the lower shell 20 of the module, and the inner wall of the lower shell 20 of the module, the first cell positioning partition 202 and the second cell positioning partition 203 can be combined to form a lattice structure, so as to limit the position of the sodium ion cell 90 and prevent the internal short circuit problem caused by squeezing and bumping between the sodium ion cells 90. Specifically, the first cell positioning partition 202 is arranged parallel to the width direction and length direction of the sodium ion cell 90, and the second cell positioning partition 203 is arranged parallel to the thickness direction and length direction of the sodium ion cell 90. At least one first cell positioning partition 202 and at least one second cell positioning partition 203 are sandwiched between two adjacent sodium ion cells 90, so that the sodium ion cell 90 abuts against the first cell positioning partition 202, the second cell positioning partition 203, and the inner wall of the lower shell 20 of the module, thereby realizing the positioning of the sodium ion cell 90. At the same time, the first cell positioning partition 202 and the second cell positioning partition 203 also provide the possibility for selectively setting different numbers of sodium ion cells, so that the battery module of the electric vehicle can be modularly set and meet different temperature characteristic requirements by adjusting the number of sodium ion cells 90.

[0064] Continue to refer to Figure 5 As shown, a buffer gasket 23 is also provided on the outer side of the module lower shell 20. Specifically, at least one buffer gasket 23 is provided on each corner of the side direction of the module lower shell 20. The buffer gasket 23 is L-shaped and made of CR neoprene material. It is installed on the module lower shell 20 by bonding with strong glue, so as to ensure to the greatest extent that the battery module of the electric vehicle will not cause accidents due to impact or collision during use.

[0065] Furthermore, in this embodiment, a power management component 40, a battery cell separator 80 and a buffer pad 60 are also provided in the module housing. The power management component 40 is used to detect the working state of the battery module of the electric vehicle and includes at least one of a humidity sensor, a temperature sensor and a current and voltage sensor. The humidity, temperature and working state of the sodium ion battery cell 90 in the module housing can be monitored by the humidity sensor, the temperature sensor and the current and voltage sensor. The battery cell separator 80 is sandwiched between the sodium ion battery cell 90 and the power management component 40 for mounting and fixing the power management component 40. The buffer pad 60 is sandwiched between the battery cell separator 80 and the power management component 40 to reduce the interference of vibration on each sensor.

[0066] The power management component 40 also includes a data transmitter and a circuit switch. The data transmitter is used to send and provide the detection results or alarm information to the user, and the circuit switch is used to power off the sodium ion battery cell 90. Through the data transmitter, the data collected by the above-mentioned sensors can be sent to the cloud background management system, and the received data can be analyzed using data processing methods such as the cumulus cloud deep learning large model, so that the future state of the battery module and possible fault points can be predicted, and necessary usage suggestions can be provided to the user. When the collected data reflects an abnormal situation, the sodium ion battery cell 90 in the module housing can be urgently powered off through the circuit switch, thereby protecting the user and preventing combustion, explosion and other phenomena.

[0067] Specifically, Figure 6 , Figure 7 As shown, a partition positioning seat 204 is provided on the lower shell 20 of the module, and a mounting hole 803 is provided on the cell partition 80. The partition positioning seat 204 can be inserted into the mounting hole 803, so that the cell partition 80 is limitedly set above the sodium ion battery cell 90, which plays a pre-fixing effect. The power management component 40 is installed on the mounting seat 802 on the top surface of the cell partition 80 by a pan head self-tapping screw 32, and the buffer pad 60 is made of foam material and is arranged between the power management component 40 and the cell partition 80, so as to play a buffering effect.

[0068] Continue to refer to Figure 5 As shown, in this embodiment, an electrode plate 70 and an insulating plate 50 are further provided in the module shell, a cell separator 80 is provided between the electrode plate 70 and the sodium ion cell 90, a plurality of sodium ion cells 90 are provided in the module shell and are electrically connected to the electrode plate 70, and an insulating plate 50 is provided between the power management component 40 and the electrode plate 70, so as to prevent a short circuit between the power management component 40 and the electrode plate 70.

[0069] Specifically, Figure 7 As shown, the cell separator 80 is provided with a plurality of electrode through-holes, and the electrodes of the sodium ion cell 90 can pass through the electrode through-holes and be electrically connected to the electrode plate 70, thereby realizing current convergence. The power management component 40 can be electrically connected to the electrode plate 70 or each sodium ion electrode, thereby monitoring the voltage and current status of each sodium ion cell 90. Figure 7 , Figure 8As shown, two positioning posts 801 are also provided on the cell separator 80, and a first positioning hole 701 and a second positioning hole 702 are provided on the electrode plate 70. The two positioning posts 801 can be respectively correspondingly penetrated in the first positioning hole 701 and the second positioning hole 702, so as to pre-position the electrode plate 70 and the cell separator 80 during installation. The electrode plate 70 is also provided with an electrode plate mounting hole 703, and the second hexagon socket pan head screw 33 passes through the electrode plate mounting hole 703 on the electrode plate 70 and the mounting hole 803 on the cell separator 80 to connect with the battery module lower housing 20 assembly, so as to fix the electrode plate 70 and the cell separator 80 to the module lower housing 20. The pan head self-tapping screw 32 passes through the insulating plate 50 and is installed on the cell separator 80, and the buffer pad 60 is bonded to the insulating plate 50 and abuts against the bottom surface of the power management component 40, so as to play a buffering effect.

[0070] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. Battery module for electric vehicle, characterized in that: include: A module housing, wherein the module housing is provided with a first through hole (101); A sodium ion battery cell (90), wherein the sodium ion battery cell (90) is fixedly disposed in the module housing; A respirator (11), wherein the respirator (11) is fixedly arranged at the first through-hole (101), and a reusable desiccant (114) and a waterproof breathable membrane (113) are arranged in the respirator (111), and external air can enter the module housing through the reusable desiccant (114) and the waterproof breathable membrane (113) in sequence, and internal air can flow out of the module housing through the waterproof breathable membrane (113) and the reusable desiccant (114) in sequence.

2. The battery module for electric vehicle according to claim 1, characterized in that: The respirator (11) includes a respirator upper cover (112) and a respirator base (111), the waterproof breathable membrane (113) is fixedly installed on the respirator base (111), the respirator base (111) is sealed and inserted in the first through-hole (101), the reusable desiccant (114) is fixedly arranged on the respirator upper cover (112), and the respirator upper cover (112) can be fixedly installed on one end of the respirator base (111) away from the module housing.

3. The battery module for electric vehicle according to claim 2, characterized in that: A waterproof sealing ring (116) is sandwiched between the respirator base (111) and the module housing, and the respirator base (111) is provided with a sealing slot, and the respirator upper cover (112) is interference-inserted into the sealing slot.

4. The battery module for electric vehicle according to claim 1, characterized in that: The module housing is provided with a second through hole (102), a waterproof threading hole plug (12) is sealed in the second through hole (102), and a waterproof sealant is provided between the waterproof threading hole plug (12) and the second through hole (102).

5. The battery module for electric vehicle according to claim 1, characterized in that: The module housing comprises a module upper housing (10) and a module lower housing (20) which can be snap-fitted together, one of the module upper housing (10) and the module lower housing (20) being provided with a waterproof sealing groove (201), a sealing glue being provided in the waterproof sealing groove (201), and the sealing glue being used for sealing the connection between the module upper housing (10) and the module lower housing (20).

6. The battery module for electric vehicle according to claim 5, characterized in that: A power management component (40), a battery cell separator (80) and a buffer pad (60) are also arranged in the module housing; the power management component (40) is used to detect the working state of the battery module of the electric vehicle and comprises at least one of a humidity sensor, a temperature sensor and a current and voltage sensor; the battery cell separator (80) is sandwiched between the sodium ion battery cell (90) and the power management component (40); the power management component (40) is mounted on the battery cell separator (80), and the buffer pad (60) is sandwiched between the battery cell separator (80) and the power management component (40).

7. The battery module for electric vehicle according to claim 6, characterized in that: An electrode plate (70) and an insulating plate (50) are also arranged in the module shell; the cell separator (80) is arranged between the electrode plate (70) and the sodium ion cell (90); a plurality of the sodium ion cells (90) are arranged in the module shell and are all electrically connected to the electrode plate (70); and the insulating plate (50) is arranged between the power management component (40) and the electrode plate (70).

8. The battery module for electric vehicle according to claim 6, characterized in that: The power management component (40) also includes a data transmitter and a circuit switch, wherein the data transmitter is used to transmit and provide the detection result or alarm information to a user, and the circuit switch is used to power off the sodium ion battery cell (90).

9. The battery module for electric vehicle according to claim 5, characterized in that: A buffer gasket (23) is provided on the outer side of the module lower shell (20).

10. The battery module for electric vehicle according to claim 1, characterized in that: The module housing is made of waterproof-grade halogen-free flame-retardant PBT material, and a waterproof coating is provided on the outer surface of the module housing.

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