Battery explosion-proof structure and battery device

Abstract

The invention discloses a battery anti-explosion structure and a battery device, and relates to the technical field of battery anti-explosion, the battery anti-explosion structure comprises a battery shell and a cover body, the battery shell is provided with an opening in a first direction, the bottom of the battery shell is provided with a plurality of pressure relief holes, the pressure relief holes are communicated with an inner cavity of the battery shell, and the pressure relief holes are communicated with the inner cavity of the battery shell. An explosion-proof valve plate is arranged at the position of the pressure relief hole, the cover body is arranged on the opening, a pole structure is arranged on the cover body and used for being electrically connected with an external structure, the pressure relief hole is arranged in a step mode so as to form a step face arranged outwards, and the explosion-proof valve plate is arranged in the pressure relief hole in a sinking mode and abuts against the step face. And a pressure relief channel is formed in the battery shell and is communicated with the pressure relief hole. The pole structure and the anti-explosion valve plate are arranged on the two sides of the battery respectively, airflow sprayed out of the anti-explosion structure is prevented from making contact with the pole, and therefore physical separation of the pole structure and the anti-explosion valve plate is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of battery explosion-proof, and in particular to a battery explosion-proof structure and a battery device. Background Art

[0002] In order to avoid the phenomenon that the single cell battery explodes due to excessive internal pressure, an explosion-proof valve plate is often provided on the cover plate of the single cell battery. The explosion-proof valve plate is in a sealed state when the internal pressure of the single cell battery is normal, which can prevent the electrolyte and other substances inside the single cell battery from flowing out or foreign matter from entering. When the internal pressure of the single cell battery is greater than the safety value, the explosion-proof valve plate will rupture, thereby connecting the upper and lower sides of the cover plate of the single cell battery, and the electrolyte or gas can directly flow out through the ruptured explosion-proof valve plate, thereby avoiding the explosion.

[0003] When an abnormality occurs in the battery, the explosion-proof valve will open, and the battery will spray electrolyte, electrode debris and other substances toward the battery top cover, that is, the direction of the passenger compartment. These substances may burn to generate a large amount of heat, thereby causing the temperature in the area where the explosion-proof valve is located to be higher. The ejected high-temperature airflow will escape and contact the electrode column, triggering high-voltage interference, causing a larger range of battery thermal runaway or spontaneous combustion problems. Summary of the invention

[0004] The main purpose of the present invention is to provide a battery explosion-proof structure and a battery device, which are intended to separate the explosion-proof valve sheet and the electrode column to avoid the problem of high-voltage interference.

[0005] To achieve the above-mentioned purpose, the battery explosion-proof structure proposed in the present invention comprises:

[0006] A battery housing having an opening in a first direction, a plurality of pressure relief holes being provided at the bottom of the battery housing, the pressure relief holes being connected to the inner cavity of the battery housing, and explosion-proof valve sheets being provided at the pressure relief holes; and,

[0007] The cover body is arranged at the opening, and a pole structure is arranged on the cover body for electrically connecting with an external structure.

[0008] Preferably, the pressure relief hole is arranged in a stepped manner to form a stepped surface arranged outwards;

[0009] The explosion-proof valve sheet is sunk in the pressure relief hole and is disposed in contact with the step surface.

[0010] Preferably, a pressure relief channel is formed in the battery housing, and the pressure relief channel is connected to the pressure relief hole.

[0011] Preferably, a support plate is provided in the battery housing, the support plate is used to support the battery cell, and a support plate flow channel is provided in the support plate;

[0012] The pressure relief channel includes the support plate flow channel.

[0013] Preferably, a plurality of airflow buffers are protruding from the inner cavity wall of the support plate flow channel, and the airflow buffers are inclined toward the middle of the support plate to limit the airflow velocity.

[0014] Preferably, a smoke exhaust duct is arranged at the bottom of the battery housing, a plurality of communication holes are opened at the top of the smoke exhaust duct, and each of the communication holes is arranged in one-to-one correspondence with the pressure relief hole.

[0015] Preferably, a plurality of temperature detectors are provided on the inner wall of the smoke exhaust duct to detect the temperature inside the smoke exhaust duct.

[0016] Preferably, a plurality of heat dissipating elements are provided on the peripheral side surface of the smoke exhaust duct.

[0017] Preferably, the heat sink comprises heat dissipation fins, and the heat dissipation fins are arranged along the circumference of the smoke exhaust duct.

[0018] To achieve the above-mentioned purpose, the present invention also provides a battery device, including the above-mentioned battery explosion-proof structure, the battery explosion-proof structure including a battery shell and a cover body, wherein the battery shell has an opening in a first direction, a plurality of pressure relief holes are provided at the bottom of the battery shell, the pressure relief holes are connected to the inner cavity of the battery shell, an explosion-proof valve sheet is provided at the pressure relief holes, the cover body is provided at the opening, and a pole structure is provided on the cover body for electrically connecting to an external structure.

[0019] In the technical solution provided by the present invention, the battery shell has an opening in a first direction, a plurality of pressure relief holes are provided at the bottom of the battery shell, the pressure relief holes are connected to the inner cavity of the battery shell, an explosion-proof valve sheet is provided at the pressure relief holes, the cover body is provided at the opening, and a pole structure is provided on the cover body for electrical connection with an external structure. By arranging the pole structure and the explosion-proof valve sheet on both sides of the battery, the high-pressure and high-temperature airflow ejected after the explosion-proof valve sheet is opened is prevented from contacting the pole, thereby realizing physical separation of the pole structure and the explosion-proof structure and ensuring the safety of the passenger compartment. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0021] Figure 1 A three-dimensional schematic diagram of an embodiment of a battery explosion-proof structure provided by the present invention;

[0022] Figure 2 for Figure 1 A schematic cross-sectional view of a battery housing;

[0023] Figure 3 for Figure 2 Schematic cross-sectional view of the center support plate.

[0024] Description of Figure Numbers:

[0025] 1. Battery shell; 2. Cover; 3. Pole structure; 4. Support plate; 41. Airflow buffer; 5. Explosion-proof valve plate; 6. Pressure relief channel; 7. Smoke exhaust pipe; 8. Temperature detection device; 9. Pressure relief hole.

[0026] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0029] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0030] The present invention provides a battery explosion-proof structure. Figures 1 to 3 This is an embodiment of the battery explosion-proof structure provided by the present invention.

[0031] Please also read Figure 1 to Figure 2The battery explosion-proof structure includes a battery shell 1 and a cover body 2, wherein the battery shell 1 has an opening in a first direction, a plurality of pressure relief holes 9 are provided at the bottom of the battery shell 1, the pressure relief holes 9 are connected to the inner cavity of the battery shell 1, an explosion-proof valve sheet 5 is provided at the pressure relief holes 9, the cover body 2 is provided at the opening, and a pole structure 3 is provided on the cover body 2 for electrically connecting with an external structure.

[0032] The cover body 2 is provided with not only a pole structure 3 but also an explosion-proof valve plate 5, which is used to discharge the retained gas inside the battery during use, thereby reducing the internal pressure of the battery. The explosion-proof valve plate 5 will carry impurities such as electrolyte debris while discharging high-pressure airflow. These impurities will escape to the surroundings with the high-pressure airflow. Both the airflow and the impurities have high temperatures and will contact the pole structure 3 during the escape process, destroying the insulating layer on the pole, thereby causing high-voltage interference, resulting in a larger range of battery thermal runaway or spontaneous combustion. In order to avoid this phenomenon, the pole structure 3 and the explosion-proof structure are respectively arranged on different sides of the battery, so that the high-pressure airflow discharged by the explosion-proof structure is difficult to contact the pole after escaping.

[0033] The top of a car power battery is generally the car passenger compartment. If the explosion-proof valve sheet 5 is set on the top of the battery, it will spray high-pressure and high-temperature airflow toward the passenger compartment, causing the temperature of part of the passenger compartment to rise, posing a safety hazard. Therefore, the pole structure 3 is set on the top side of the battery, and the explosion-proof valve sheet 5 is set at the bottom of the battery, so that the explosion-proof valve sheet 5 will not spray toward the passenger compartment or the pole when discharging the high-pressure and high-temperature airflow. At the same time, the high-pressure and high-temperature airflow will not contact the pole after escaping, thereby avoiding the insulation layer of the pole from being destroyed, causing high-voltage interference and causing battery damage.

[0034] The battery needs to be filled with electrolyte, which is usually done through the filling port. During the filling process, some electrolyte may flow onto the battery housing 1 due to hand shaking or the like. The explosion-proof valve plate 5 is usually welded to the battery housing 1. The welding position of the explosion-proof valve plate 5 is easily corroded by contact with the electrolyte, resulting in damage to the explosion-proof valve plate 5. Therefore, the filling port for filling the electrolyte also needs to be set separately from the explosion-proof valve plate 5 to prevent the electrolyte from flowing to the explosion-proof valve plate 5 and damaging the explosion-proof valve plate 5. Therefore, the filling port can be set on the cover body 2 and be located on the same side as the pole structure 3.

[0035] Therefore, in the technical solution provided by the present invention, the battery shell 1 has an opening in a first direction, a pressure relief hole 9 is provided at the bottom of the battery shell 1, the pressure relief hole 9 is connected to the inner cavity of the battery shell 1, an explosion-proof valve plate 5 is provided at the pressure relief hole 9, the cover body 2 is provided at the opening, and a pole structure 3 is provided on the cover body 2 for electrical connection with an external structure. By arranging the pole structure 3 and the explosion-proof valve plate 5 on both sides of the battery, the high-pressure and high-temperature airflow ejected after the explosion-proof valve plate 5 is opened is prevented from contacting the pole, thereby realizing the physical separation of the pole structure 3 and the explosion-proof valve plate 5, and ensuring the safety of the passenger compartment.

[0036] The usual way of setting the explosion-proof valve plate easily produces a certain gap, and the fit is not tight enough, so it needs to be improved. Specifically, in an embodiment of the present invention, the pressure relief hole 9 is arranged in a step shape to form a step surface facing outward, and the explosion-proof valve plate 5 is sunk in the pressure relief hole 9 and is arranged in contact with the step surface.

[0037] The high-pressure airflow generated inside the battery during use flows out of the battery through the pressure relief hole 9 and is discharged to the outside of the battery through the explosion-proof structure. The pressure relief hole 9 is arranged in a stepped manner so that the explosion-proof valve plate 5 and the battery housing 1 fit more closely, thereby improving the sealing.

[0038] Furthermore, a pressure relief channel 6 is formed in the battery housing 1, and the pressure relief channel 6 is connected to the pressure relief hole 9. The flow direction of the airflow is uncertain. In order to ensure that the airflow can accurately flow to the pressure relief hole 9 and be discharged to the outside of the battery through the explosion-proof structure, a pressure relief channel 6 connected to the pressure relief hole 9 is provided. The airflow flows along the pressure relief channel 6 and only flows to the pressure relief hole 9, and is then discharged to the outside of the battery through the explosion-proof structure.

[0039] See also Figure 3 Furthermore, a support plate 4 is provided in the battery housing 1, and the support plate 4 is used to support the battery cell. A support plate 4 flow channel is provided in the support plate 4, and the pressure relief channel 6 includes the support plate 4 flow channel. The support plate 4 is generally arranged on the bottom wall of the inner cavity of the battery housing 1, and the pressure relief hole 9 is also arranged at the bottom of the inner cavity of the battery housing 1. In order to prevent the support plate 4 from affecting the circulation of the high-pressure airflow in the battery, a support plate 4 flow channel is opened on the support plate 4 for airflow circulation.

[0040] A certain gap is formed between the battery cell and the inner wall of the battery shell 1 to constitute a partial pressure relief channel 6, so that the high-pressure airflow generated inside the battery can flow downward to the bottom of the inner cavity of the battery shell 1, and then a support plate 4 flow channel connected to the pressure relief hole 9 is opened on the support plate 4 used to support the battery cell. The support plate 4 flow channel is another part of the pressure relief channel 6, thereby forming a complete pressure relief channel 6 so that the airflow can flow to the pressure relief hole 9 at the bottom of the battery and be discharged to the outside of the battery through the explosion-proof structure.

[0041] When the internal pressure of the battery rises abnormally, the gas will first flow from the inner cavity space where the battery cell is located toward the pressure relief hole 9. Due to the connectivity of the pressure relief channel 6, the gas can pass through the pressure relief channel 6 relatively smoothly and finally reach the pressure relief hole 9. If the pressure exceeds the set threshold of the explosion-proof structure, the explosion-proof valve plate 5 will open to perform pressure relief operation to ensure the safety of the battery and prevent serious accidents such as explosions caused by excessive internal pressure.

[0042] The internal winding core of the battery will expand after being heated or aged. The volume of the expanded winding core increases and may contact the inner wall of the battery shell 1. The chamfered area at the bottom of the battery shell 1 is limited, so the expanded area at the bottom and bottom corners will be concentrated and squeezed at the bottom corners of the battery shell 1, causing the battery cell to be squeezed and damaged. Therefore, it is necessary to set a support plate at the bottom of the battery, and set the length of the support plate 4 to be slightly shorter than the length of the winding core, so that there is more release space for the winding core after expansion to avoid mutual squeezing with the battery shell 1.

[0043] High-pressure airflow may enter a laminar state during the flow process, and then form turbulence, affecting the stability of gas circulation. Therefore, it is necessary to limit the gas circulation state. Specifically, a plurality of airflow buffers 41 are protruding from the inner wall of the flow channel of the support plate 4, and the airflow buffers 41 are inclined toward the middle of the support plate 4 to limit the airflow velocity.

[0044] The laminar flow state of the fluid in the flow channel is destroyed by the airflow buffer 41, so that the gas forms a more complex turbulence, and the contact area and friction between the gas and the flow channel wall are increased, thereby reducing the gas flow rate and playing a buffering role, avoiding the gas from directly impacting the explosion-proof valve plate 5 at high speed, which is beneficial for the explosion-proof valve plate 5 to more stably control the pressure relief process. At the same time, the gas is caused to generate more vortices and diversions in the flow channel, so that the gas in different areas is fully mixed and dispersed, avoiding local excessive pressure or gas aggregation, making the pressure relief process more uniform and efficient, and reducing the damage to other components inside the battery caused by uneven gas flow.

[0045] Some solid impurity particles may be generated inside the battery. The airflow buffer 41 can intercept these particles to a certain extent and prevent them from clogging the pressure relief hole 9 or damaging the explosion-proof valve plate 5 with the flow of gas, thereby improving the reliability and stability of the entire explosion-proof structure, and can enhance the structural strength of the flow channel of the support plate 4 to a certain extent. Especially when subjected to internal pressure, the airflow buffer 41 can disperse the pressure and reduce the possibility of rupture or deformation of the flow channel wall.

[0046] Other forms of structures can also be set. For example, serrated protrusions can be set on the inner wall of the flow channel. Their function is similar to that of the airflow buffer 41. They can disrupt the smooth flow of the airflow, produce a turbulence effect, and play a role in buffering and dispersing the gas. The advantage of the serrated structure is that the processing is relatively simple, and the degree of turbulence can be controlled by adjusting the size, spacing and angle of the serrations, or a spiral guide vane can be set in the flow channel of the support plate 4 to make the gas flow along a spiral path. This structure can guide the gas to form a spiral ascending or descending flow pattern, increase the gas stroke in the flow channel and the contact with the flow channel wall, so as to achieve the purpose of buffering the gas and promoting mixing and dispersion. The advantage of the spiral guide vane is that its guiding effect is more stable and its guiding effect on the gas is stronger, but the manufacturing process may be relatively complicated.

[0047] The high-pressure and high-temperature airflow discharged from the explosion-proof structure will dissipate to the surroundings and float upward without guidance. If the rising speed is too fast, it will contact the pole structure 3 before its temperature drops, causing the problem of high-voltage interference. Therefore, it is necessary to restrict the flow of airflow again. Specifically, in an embodiment of the present invention, a smoke exhaust duct 7 is provided at the bottom of the battery housing 1, and a plurality of connecting holes are opened at the top of the smoke exhaust duct 7, and each of the connecting holes is provided in a one-to-one correspondence with the pressure relief hole 9.

[0048] The high-pressure airflow generated during the use of the battery flows to the pressure relief hole 9 through the pressure relief channel. After the explosion-proof valve plate 5 is opened, the high-pressure airflow enters the connecting hole through the pressure relief hole 9 and enters the smoke exhaust duct 7 through the connecting hole. The high-pressure airflow is discharged to the outside of the car along the smoke exhaust duct 7. The existing battery is generally composed of multiple battery cells. Therefore, multiple battery cells are arranged in a battery housing. Each battery cell is matched with a pressure relief hole 9, an explosion-proof valve plate 5 and a pressure relief channel, so that the high-pressure airflow is discharged to the outside of the battery, and then the smoke exhaust duct 7 is used to centrally process the high-pressure airflow discharged by the battery to prevent it from escaping to other locations and affecting other components.

[0049] A connecting hole is provided on the smoke exhaust duct 7 corresponding to the pressure relief hole 9, and the pressure relief channel is connected through the connecting hole. When the explosion-proof valve plate 5 is opened, it will enter the connecting hole to open the pressure relief hole 9 to discharge high-pressure airflow. In order to facilitate the assembly of the smoke exhaust duct 7 on the battery housing 1, it is necessary to set the aperture of the connecting hole to be larger than the aperture of the pressure relief hole 9. At the same time, it is also necessary to ensure that the aperture of the connecting hole is larger than the length of the explosion-proof valve plate 5, so that when the explosion-proof structure is opened, the explosion-proof valve plate 5 can enter the connecting hole to open the pressure relief hole 9 to discharge high-pressure airflow.

[0050] The smoke exhaust duct 7 guides the high-pressure airflow to the outside of the car, avoiding the impact of the airflow on other components, reducing the safety risks that may be caused by the escape of airflow, and ensuring the safe operation of the battery and the entire car. The connecting holes arranged at the top of the smoke exhaust duct 7 corresponding to the pressure relief holes 9 provide a clear and smooth discharge path for the high-pressure airflow, ensuring that the airflow can be efficiently discharged from the inside of the battery to the outside, reducing the retention of airflow in the battery housing 1, and the aperture design of the connecting hole on the smoke exhaust duct 7 has specific requirements, which is larger than the aperture of the pressure relief hole 9 and the length of the explosion-proof valve plate 5. This allows the explosion-proof valve plate 5 to enter the connecting hole to open the pressure relief hole when it is opened, facilitating the normal operation of the explosion-proof structure and ensuring that the high-pressure airflow can be discharged smoothly.

[0051] The smoke exhaust duct 7 inside the battery is not provided with a temperature detection device 8, and the temperature of the gas discharged from the bottom cannot be detected. Therefore, a temperature detection device 8 is provided in the smoke exhaust duct 7 to facilitate the detection of the airflow temperature. Specifically, in an embodiment of the present invention, a plurality of temperature detectors 8 are provided on the inner cavity wall of the smoke exhaust duct 7 to detect the temperature inside the smoke exhaust duct.

[0052] Thermal runaway of the battery cell is a serious problem that may occur during the use of the battery, which may cause dangerous situations such as high temperature and high pressure. By arranging a temperature detection device 8 in the exhaust duct 7, the high-temperature gas released when the battery cell is in thermal runaway can be monitored in time so that corresponding measures can be taken. At the same time, it can also provide a basis for the action of devices such as the explosion-proof valve plate 5. For example, when the temperature reaches a certain threshold, it can be judged that the internal situation of the battery is critical, and the explosion-proof valve plate 5 needs to be opened in time to release the pressure to prevent serious accidents such as battery explosion, thereby ensuring the effectiveness and safety of the entire battery explosion-proof structure. In addition, the temperature detection device 8 can feedback the temperature information inside the battery in real time, and issue a thermal runaway warning in advance, so that related equipment or systems have enough time to take countermeasures, such as stopping the battery from working, starting the heat dissipation device, etc., to avoid further expansion of the danger and protect the safety of equipment and personnel.

[0053] Since the exhaust channel is long, in order to detect the temperature comprehensively and accurately, multiple temperature detection points should be evenly distributed along the length of the channel or reasonably distributed according to the actual situation. For example, detection points are set at the starting section, middle section and end of the exhaust pipe 7, so that the temperature changes at different positions can be captured and the degree and development direction of thermal runaway can be judged more accurately. When setting the temperature detection device 8, care should be taken to avoid causing excessive interference to the airflow in the exhaust channel to avoid affecting the pressure relief effect. The detection device can be embedded in the channel wall, or a small, streamlined design can be adopted to allow the airflow to pass smoothly.

[0054] A fan or other equipment can be arranged in the smoke exhaust duct 7 to accelerate the flow of airflow, so as to prevent some airflow from flowing slowly and accumulating in the smoke exhaust duct 7, thereby causing the temperature at the bottom of the battery housing 1 to rise, thereby affecting the safety of the battery cell from the bottom. After the fan or other equipment is started, the speed of the airflow flowing toward the smoke exhaust channel outlet is accelerated, so that the high-pressure and high-temperature airflow is discharged into the smoke exhaust channel and quickly flows to the smoke exhaust channel outlet, thereby reducing the temperature in the smoke exhaust channel. A corresponding heat dissipation structure can also be arranged on the smoke exhaust duct 7 to accelerate the heat dissipation capacity of the smoke exhaust duct 7 itself. Specifically, in an embodiment of the present invention, a plurality of heat dissipation components are arranged on the surrounding side of the smoke exhaust duct 7.

[0055] The heat dissipation capacity of the smoke exhaust duct 7 is improved by the heat dissipation component, so that the smoke exhaust duct 7 itself can quickly release heat to the outside, thereby avoiding heat accumulation in the smoke exhaust duct 7, so as to avoid a large amount of heat accumulation at the bottom of the battery, causing the battery to heat up and affecting the safety of battery use.

[0056] Furthermore, the heat sink includes heat dissipation fins, and the heat dissipation fins are arranged along the circumference of the smoke exhaust duct 7. The heat dissipation fins are a relatively common heat dissipation structure. By arranging a plurality of heat dissipation fins on the outer peripheral wall of the smoke exhaust duct 7, the loss of heat inside the smoke exhaust duct 7 is accelerated, and the loss of heat at the opening of the smoke exhaust duct 7 is combined with the acceleration of the temperature drop in the smoke exhaust duct 7, thereby effectively reducing the temperature in the smoke exhaust duct 7 and preventing the bottom of the battery from heating up due to heat accumulation, thereby greatly ensuring the safety of battery use and extending the battery life. At the same time, it also helps to maintain the stability and safety of the internal environment of the vehicle and reduce the potential risks that may be caused by battery overheating.

[0057] The heat sink fins use the principle of heat conduction. When the heat in the exhaust duct is transferred to the heat sink fins, the heat sink fins have a larger surface area and can exchange heat more fully with the surrounding air. The heat is transferred from the high-temperature surface of the heat sink fins to the relatively low-temperature air molecules, thereby accelerating the transfer of heat from the exhaust duct to the outside. This process of heat conduction and heat exchange is continuous. As long as heat is generated in the exhaust duct and there is a temperature difference between the heat sink fins and the surrounding air, the heat will continue to be dissipated. The temperature in the exhaust duct is effectively reduced by the heat sink fins, thereby preventing the bottom of the battery from heating up, maintaining the stability of the chemical reaction inside the battery, ensuring the performance and safety of the battery, and extending its service life.

[0058] Battery overheating will not only affect the battery itself, but may also have a negative impact on other components and the environment inside the vehicle. High temperature may accelerate the aging of surrounding electronic components and circuits, increase the probability of failure, and affect the overall performance and reliability of the vehicle. Moreover, overheated batteries also pose a potential risk of fire or explosion, which poses a serious threat to the safety of the vehicle. Therefore, the heat sink fins ensure the safety of the battery and also help maintain the stability and safety of the vehicle's internal environment, reducing various potential risks caused by battery overheating and providing strong support for the safe driving of the vehicle.

[0059] To achieve the above-mentioned purpose, the present invention also provides a battery device, including the above-mentioned battery explosion-proof structure, the battery explosion-proof structure including a battery shell 1 and a cover body 2, wherein the battery shell 1 has an opening in a first direction, a pressure relief hole 9 is provided at the bottom of the battery shell 1, the pressure relief hole 9 is connected to the inner cavity of the battery shell 1, an explosion-proof valve sheet 5 is provided at the pressure relief hole 9, the cover body 2 is provided at the opening, and a pole structure 3 is provided on the cover body 2 for electrically connecting to an external structure.

[0060] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A battery explosion-proof structure, characterized in that: include: A battery housing having an opening in a first direction, a plurality of pressure relief holes being provided at the bottom of the battery housing, the pressure relief holes being connected to the inner cavity of the battery housing, and explosion-proof valve sheets being provided at the pressure relief holes; and, The cover body is arranged at the opening, and a pole structure is arranged on the cover body for electrically connecting with an external structure.

2. The battery explosion-proof structure according to claim 1, characterized in that: The pressure relief hole is arranged in a stepped manner to form a stepped surface arranged outwards; The explosion-proof valve sheet is sunk in the pressure relief hole and is disposed in contact with the step surface.

3. The battery explosion-proof structure according to claim 1, characterized in that: A pressure relief channel is formed in the battery housing, and the pressure relief channel is connected to the pressure relief hole.

4. The battery explosion-proof structure according to claim 3, characterized in that: A support plate is provided in the battery housing, the support plate is used to support the battery cell, and a support plate flow channel is provided in the support plate; The pressure relief channel includes the support plate flow channel.

5. The battery explosion-proof structure according to claim 4, characterized in that: A plurality of airflow buffers are protrudingly provided on the inner cavity wall of the support plate flow channel, and the airflow buffers are inclined toward the middle of the support plate to limit the airflow velocity.

6. The battery explosion-proof structure according to claim 1, characterized in that: A smoke exhaust pipe is arranged at the bottom of the battery housing, a plurality of communication holes are opened at the top of the smoke exhaust pipe, and each of the communication holes is arranged in one-to-one correspondence with the pressure relief hole.

7. The explosion-proof structure of a battery as claimed in claim 6, characterized in that: The inner wall of the smoke exhaust pipe is provided with a plurality of temperature detectors for detecting the temperature inside the smoke exhaust pipe.

8. The battery explosion-proof structure according to claim 6, characterized in that: A plurality of heat dissipating elements are arranged on the peripheral side of the smoke exhaust pipe.

9. The battery explosion-proof structure according to claim 8, characterized in that: The heat sink comprises heat dissipation fins, and the heat dissipation fins are arranged along the circumference of the smoke exhaust pipe.

10. A battery device, characterized in that: The invention comprises a battery explosion-proof structure as claimed in any one of claims 1 to 9.

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