Explosion-proof valve structure, battery cell, battery and automobile

Abstract

The utility model discloses an explosion-proof valve structure, a battery cell, a battery and an automobile, the explosion-proof valve structure is hollow and is used for assembling a pole core, the explosion-proof valve structure comprises a shell and an explosion-proof valve, and the shell is used for covering the side surface of the pole core; the anti-explosion valve and the shell are integrally formed, and the anti-explosion valve is formed on the side face of the shell. The explosion-proof valve comprises a boss and a nick, the boss is formed by protruding the side face of the shell from inside to outside, and the nick is arranged on the boss. And when the internal pressure of the shell is increased, the shell is broken from the nick, and the high-temperature substances in the shell are sprayed out from the broken crack to finish pressure relief. The explosion-proof valve is directly formed by the shell, the explosion-proof function is achieved, meanwhile, the situation that the weight of the shell is increased by additionally welding the explosion-proof valve is avoided, machining is easy, and cost can be saved.

Description

Technical Field

[0001] The utility model relates to the field of new energy batteries, and in particular to an explosion-proof valve structure, a battery cell, a battery and a car. Background Art

[0002] Traditional battery designs typically feature an explosion-proof valve on the cover plate to prevent explosion in the event of thermal runaway within the battery cell. However, the battery's explosion-proof valve is typically located on the same side as the electrode terminals. In a battery module, the electrode terminals of different cells are connected via connectors, and components such as signal acquisition within the module are located near the battery terminals. If a cell experiences thermal runaway and the explosion-proof valve opens, the internal electrolyte and high-temperature materials will spray out of the valve opening, potentially causing sparks. This could damage the battery's electrode terminals and the module's signal acquisition components, and in severe cases, could lead to fire and explosion of the entire module, resulting in a safety incident.

[0003] Chinese utility model patent publication number CN216354615U discloses a power battery structure that incorporates an explosion-proof valve on the side of the housing to prevent internal electrolyte and high-temperature substances from being ejected from the valve opening when the valve is opened, potentially damaging the battery's electrode terminals and electronic components such as the module's signal acquisition system. However, the explosion-proof valve in this utility model patent requires additional production and subsequent welding to the housing, increasing both production costs and the weight of the housing. Utility Model Content

[0004] The explosion-proof valve structure, battery cell, battery and automobile provided by the utility model are intended to solve the problem that the explosion-proof valve in the prior art increases production costs and the weight of the casing.

[0005] In a first aspect, the utility model discloses an explosion-proof valve structure, wherein the interior of the explosion-proof valve structure is a hollow structure, and the explosion-proof valve structure comprises:

[0006] a shell, used to cover the side of the pole core; and

[0007] An explosion-proof valve is integrally formed with the shell and is formed on the side of the shell; the explosion-proof valve includes a boss and a notch, the boss is formed by the side of the shell protruding from the inside to the outside, and the notch is arranged on the boss.

[0008] In some embodiments, the boss is a closed ring structure.

[0009] In some embodiments, the notch is provided on a side of the boss away from the housing.

[0010] In some embodiments, the notch is a closed ring structure.

[0011] In some embodiments, the explosion-proof valve further includes a groove, wherein the groove is formed by the side surface of the shell protruding from the inside to the outside to form a boss, and the inner wall of the side surface of the shell is concave from the inside to the outside, and the notch is arranged opposite to the groove.

[0012] In some embodiments, the distance from the edge of the notch to the edge of the boss is in the range of 0.1 mm to 1 mm; and the boss is disposed in the middle of the side surface of the shell.

[0013] In some embodiments, the shell includes two oppositely arranged first side panels and two oppositely arranged second side panels, and the first side panels and the second side panels are sequentially connected to form the shell; the width of the first side panel is smaller than that of the second side panel, and the explosion-proof valve is arranged on the first side panel.

[0014] In the second aspect, the utility model also discloses a battery cell, including a pole core and the explosion-proof valve structure described in the first aspect, the pole core is assembled in the shell, the pole core includes a side surface covered by the shell and two end surfaces for setting electrodes, and the two end surfaces for setting electrodes are arranged opposite to each other.

[0015] In a third aspect, the present invention further discloses a battery comprising at least one battery cell as described in the second aspect, wherein the battery cells are arranged in a matrix.

[0016] In a fourth aspect, the present invention further discloses a car, comprising an electric drive and the battery described in the third aspect, wherein the battery is electrically connected to the electric drive.

[0017] The beneficial effects of the present invention are as follows: an explosion-proof valve is provided on the side of the shell, and the explosion-proof valve is integrally formed with the shell, and the explosion-proof valve is formed on the side of the shell; the explosion-proof valve includes a boss and a notch, the boss is formed by the side of the shell protruding from the inside to the outside, and the notch is provided on the boss. When the pressure inside the shell increases, the shell breaks at the notch, and the high-temperature material in the shell is ejected from the fractured crack to complete the pressure relief. The explosion-proof valve is directly formed by the shell, while achieving the explosion-proof function, avoiding the need for additional welding of the explosion-proof valve to increase the weight of the shell, and the processing is simple, which can save costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0019] Figure 1A structural diagram of an explosion-proof valve structure provided in an embodiment of the present utility model;

[0020] Figure 2 A front view of the explosion-proof valve structure provided by an embodiment of the utility model;

[0021] Figure 3 A side view of the explosion-proof valve structure provided by an embodiment of the present utility model;

[0022] Figure 4 for Figure 3 An enlarged view of a part A of the explosion-proof valve structure shown;

[0023] Figure 5 for Figure 4 An enlarged view of part B of the explosion-proof valve structure is shown.

[0024] Figure numbers: 1, shell; 11, first side plate; 12, second side plate; 2, explosion-proof valve; 21, boss; 22, notch; 221, upper bottom; 222, first waist edge; 223, second waist edge; 224, lower bottom; 23, groove. DETAILED DESCRIPTION

[0025] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. Now, in conjunction with the accompanying drawings, a detailed description of the preferred embodiments of the present utility model will be given.

[0026] like Figure 1 、 Figure 2 as well as Figure 3 As shown, an embodiment of the present invention discloses an explosion-proof valve structure with a hollow interior for assembling a pole core. The explosion-proof valve structure can be used in the field of new energy batteries. The explosion-proof valve structure can include a housing 1 and an explosion-proof valve 2. The housing 1 is used to cover the side of the pole core, and the explosion-proof valve 2 is integrally formed with the housing 1. The explosion-proof valve 2 includes a boss 21 and a notch 22. The boss 21 is formed by a side surface of the housing 1 protruding from the inside outward, and the notch 22 is provided on the boss 21.

[0027] In this embodiment, the shell 1 may be an aluminum shell having a cavity (i.e., a hollow structure) inside for assembling the pole core. The shell 1 may serve as an assembly carrier for the pole core and protect the pole core. The pole core assembled in the shell 1 is used to transmit current, and the pole core may be composed of a plurality of pole pieces stacked together. The pole core may include two oppositely disposed end faces and a plurality of side faces. At least one of the two oppositely disposed end faces of the pole core is used to set the electrode of the pole core. Preferably, one end face of the pole core is provided with a positive electrode, and the other end face is provided with a negative electrode. The shell 1 covers the side faces of the pole core, that is, the two ends of the pole core are arranged near the two ends of the shell 1, and the relative module components arranged near the electrodes are also arranged near the two ends of the shell 1.

[0028] The explosion-proof valve 2 is used to prevent the battery cell from catching fire or exploding. Specifically, when thermal runaway occurs within the battery cell, the pressure within the housing 1 increases, the explosion-proof valve 2 opens, and the gas, electrolyte, or other high-temperature substances within the housing 1 are discharged through the explosion-proof valve 2, thereby reducing the pressure within the housing 1 and preventing the battery cell from exploding. In this embodiment, the explosion-proof valve 2 is formed on the side of the housing 1. When the pressure within the housing 1 increases, the explosion-proof valve 2 opens, and the gas, electrolyte, or other high-temperature substances within the housing 1 are discharged through the explosion-proof valve 2, thereby reducing damage or impact on related module components located near the ends of the housing 1. Furthermore, the explosion-proof valve 2 is integrally formed with the housing 1, that is, the explosion-proof valve 2 is directly stamped from the side of the housing 1. This simplifies the process and eliminates the need to separately weld the explosion-proof valve 2 to the housing 1. The sidewalls of the housing 1 can be made thinner, which helps reduce production costs, reduce the overall weight of the battery cell, and improve the internal space utilization of the battery cell.

[0029] The explosion-proof valve 2 includes a boss 21 and a notch 22. The boss 21 is formed by a protrusion from the inside to the outside of the side of the shell 1, that is, there is a height difference between the outer surface of the shell 1 outside the boss 21 and the outer surface of the boss 21. The notch 22 on the shell 1 makes the internal pressure limit that the shell 1 can withstand at the notch 22 smaller than that at other locations. Therefore, when the battery cell is thermally runaway and the pressure inside the shell 1 increases, the shell 1 is impacted by the internal high-temperature and high-pressure substances and will preferentially crack from the notch 22 of the explosion-proof valve 2, thereby discharging the internal high-pressure substances from the shell 1, completing the pressure relief and preventing the battery cell from catching fire and exploding. During the production or transportation of the battery cell, the shell 1 may vibrate. The notch 22 of the shell 1 is relatively weak compared to other parts and is easily damaged when the shell 1 vibrates, causing the electrolyte inside it to leak out. The notch 22 is set on the boss 21 formed by the protrusion from the inside to the outside of the shell 1. According to the force analysis, the boss 21 of this shape can provide a buffer and will not increase the thickness of the shell 1. Compared with the notch 22 being directly set on the flat shell 1, it can reduce the stress generated by vibration at the notch 22 without increasing the material cost, prevent the shell 1 from breaking at the notch 22 due to vibration, and prevent the electrolyte inside the shell 1 from flowing out of the shell 1 during production or transportation, and prevent the battery cell from losing its discharge function.

[0030] In some embodiments, see also Figure 1 as well as Figure 3 , the boss 21 is a closed annular structure.

[0031] In this embodiment, the boss 21 can be configured in a closed runway shape, i.e., the outer surface of the housing 1 on both the inside and outside of the runway have a height difference from the outer surface of the boss 21. On the one hand, the closed runway shape of the boss 21 can reduce the impact of stress generated by vibration on the inside and outside of the runway on the notch 22 on the boss 21, thereby comprehensively increasing the strength of the housing 1 where the notch 22 is provided, preventing it from breaking due to other reasons (such as vibration) before it can fulfill its explosion-proof function. On the other hand, the annular boss 21 can also improve the anti-slip performance of the housing 1. During the transportation of the housing 1, a corresponding fixing component can be used to cooperate with the boss 21 to achieve the position limit of the housing 1, facilitating transportation. The outer surface of the housing 1 on the inside of the runway is flush with the outer surface of the housing 1 on the outside of the runway, and the inner surface of the housing 1 on the inside of the runway is flush with the inner surface of the housing 1 on the outside of the runway. It is understood that the boss 21 can also be configured in a closed circular ring, square ring, or other closed ring shape.

[0032] In other embodiments, the outer surface of the housing 1 on the inner side of the runway may not be flush with the outer surface of the housing 1 on the outer side of the runway.

[0033] In some embodiments, see also Figure 1 、 Figure 4 as well as Figure 5 The notch 22 is arranged on a side of the boss 21 away from the housing 1 .

[0034] In this embodiment, the notch 22 is disposed on the side of the boss 21 away from the housing 1, that is, the opening of the notch 22 is disposed toward the outside of the housing 1. The notch 22 in this embodiment can be formed by stamping or laser etching the housing 1. Therefore, disposing the opening of the notch 22 toward the outside of the housing 1 facilitates processing, reduces processing difficulty, and reduces production time and cost.

[0035] Specifically, depending on the specific processing method and force analysis, the cross-sectional shape of the notch 22 can be set to a trapezoidal, semicircular, rectangular, etc. When the cross-sectional shape of the notch 22 is set to a trapezoidal, the cross-section of the notch 22 includes an upper base 221, a first waist edge 222, a second waist edge 223, and a lower base 224. The length of the upper base 221 is shorter than that of the lower base 224, and the upper base 221 is closer to the interior of the housing 1 than the lower base 224. The first waist edge 222 and the second waist edge 223 are symmetrically arranged along the line connecting the centers of the upper base 221 and the lower base 224. The length D of the upper base 221 is greater than 0.1 mm, and the angle C formed by the extension lines of the first waist edge 222 and the second waist edge 223 ranges from 40 degrees to 70 degrees, and can specifically be 40 degrees, 50 degrees, 60 degrees, or 70 degrees. It should be noted that the lower base 224 is not an actual edge, but rather a virtual line between the opening edges of the notch 22. It is defined here as the lower base 224 only for the purpose of providing a complete description of the cross-sectional shape of the notch 22. By setting the length of the upper base 221 to be shorter than that of the lower base 224, the first waist edge 222 and the second waist edge 223 both connect the upper base 221 and the lower base 224, giving the trapezoidal notch 22 a trumpet-like cross-section that expands from the inside out. This greatly reduces the probability of the first waist edge 222 and the second waist edge 223 being squeezed together before the internal pressure is reduced when the notch 22 breaks, thereby avoiding the problem of delayed discharge of high-pressure materials, further ensuring the explosion-proof function of the explosion-proof valve 2.

[0036] In some embodiments, see also Figure 1 、 Figure 3 as well as Figure 4 , the notch 22 is a closed ring structure.

[0037] In this embodiment, the notch 22 is a closed annular structure, meaning it extends along the entire length of the boss 21. Specifically, when viewed perpendicular to the plane of the boss 21, the notch 22 is also a closed annular structure, and its shape is similar to that of the boss 21. The notch 22 is also a closed annular structure. Compared to notch 22 located only in a portion of the boss 21, this can improve the pressure relief rate of the explosion-proof valve 2. Specifically, when thermal runaway occurs within the housing 1 and pressure rises, the specific location of thermal runaway may occur anywhere within the explosion-proof valve 2, meaning that high-temperature material may be located anywhere within the explosion-proof valve 2. Therefore, the notch 22 is also designed as a closed annular structure. When thermal runaway occurs within the housing 1 and pressure rises, the notch 22 ruptures, allowing the high-temperature material to preferentially and quickly flow out from the portion closest to the notch 22, thereby improving the pressure relief rate of the explosion-proof valve 2.

[0038] In some embodiments, see also Figure 1 and4 The explosion-proof valve 2 also includes a groove 23. When the side surface of the shell 1 bulges out from the inside to the outside to form a boss 21, the inner wall of the side surface of the shell 1 is concave from the inside to the outside, and the notch 22 is arranged opposite to the groove 23.

[0039] In this embodiment, the groove 23 is also configured as a closed annular shape, similar to the boss 21 and the notch 22. The width of the groove 23 itself is greater than the width of the notch 22, but less than the first width of the boss 21. The first width of the boss 21 is the width of the boss 21 itself, not the width of the "track" formed by the boss 21. The cross-sectional shape of the groove 23 itself can be a regular rectangle. When the shell 1 is thermally runaway and the pressure increases, the groove 23 can, on the one hand, concentrate the stress of the shell 1, so that the shell 1 breaks preferentially at the notch 22 opposite to the groove 23, thereby preventing other parts of the shell 1 from being deformed due to the high pressure generated inside; on the other hand, the groove 23 can also serve as a guide groove for guiding the flow of high-temperature substances (such as electrolyte), that is, the groove 23 forms a height difference with other parts of the inner wall of the shell 1. When the shell 1 is thermally runaway and the pressure increases, and the shell 1 breaks at the notch 22, the cracks caused by the fracture will connect the relatively set cracks and the groove 23, and the fluid material can quickly enter the groove 23 and be discharged to the outside of the shell 1 from the cracks caused by the fracture, thereby increasing the pressure relief speed of the explosion-proof valve 2.

[0040] In some embodiments, see also Figure 4 The distance from the edge of the notch 22 to the edge of the boss 21 is in the range of 0.1 mm to 1 mm.

[0041] In this embodiment, the distance L from the edge of the notch 22 to the edge of the boss 21 is L, and the range of L is 0.1mm-1mm. The distance L from the edge of the notch 22 to the edge of the boss 21 should be understood as the edge of the notch 22 and the edge of the boss 21 on the same side of the center line of the notch 22, and on the side away from the center line of the "runway" formed by the boss 21. The distance L from the edge of the notch 22 to the edge of the boss 21 can specifically be 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm and 1mm. According to force analysis, the smaller the distance L from the edge of the notch 22 to the edge of the boss 21, the smaller the stress generated by the vibration at the notch 22 when the shell 1 vibrates. Therefore, the smaller the distance L from the edge of the notch 22 to the edge of the boss 21, the higher the resistance of the notch 22 to vibration, that is, the higher the safety of the shell 1. However, the distance L from the edge of the notch 22 to the edge of the boss 21 should be at least greater than 0.1 mm, and should be kept relative to the above-mentioned groove 23, so as to ensure that it can resist vibration while also ensuring that it can stably achieve the explosion-proof effect.

[0042] In some embodiments, see also Figure 1 as well as Figure 4 The boss 21 is arranged in the middle of the side surface of the shell 1.

[0043] In this embodiment, the boss 21 is disposed in the middle of the side surface of the housing 1, i.e., the center of the "track" formed by the boss 21 coincides with the center of the side surface of the housing 1 on which it is located. In other words, the notch 22 on the boss 21 and the groove 23 opposite to the notch 22 are also disposed in the middle of the side surface of the housing 1. This arrangement allows the explosion-proof valve 2 to be subjected to a more uniform force. When thermal runaway occurs and the internal pressure of the housing 1 rises rapidly, the internal pressure of the housing 1 can be transferred as evenly as possible to the location of the notch 22, thereby reducing the probability of deformation of other portions of the side surface of the housing 1 on which the explosion-proof valve 2 is located. The other portions herein refer to the portions of the side surface of the housing 1 on which the explosion-proof valve 2 is located that are not provided with the explosion-proof valve 2.

[0044] In some embodiments, see also Figure 1 、 Figure 3 as well as Figure 4 The shell 1 includes two oppositely arranged first side panels 11 and two oppositely arranged second side panels 12. The first side panels 11 and the second side panels 12 are sequentially connected to form the shell 1; the width of the first side panel 11 is smaller than that of the second side panel 12, and the explosion-proof valve 2 is arranged on the first side panel 11.

[0045] In this embodiment, the housing 1 includes two opposing first side panels 11 and two opposing second side panels 12. The first side panels 11 and the second side panels 12 are sequentially connected to form the housing 1. The two first side panels 11 and the second side panels 12 can be integrally formed or spliced ​​together. The housing 1 is rectangular, and its shape is the same as the pole core disposed therein to facilitate encapsulation of the pole core. The first side panel 11 is narrower than the second side panel 12, and the explosion-proof valve 2 is disposed on the first side panel 11, that is, on the narrower side of the housing 1. When the pressure within the housing 1 increases sharply, the second side panel 12 is more susceptible to deformation due to its greater width. In comparison, the first side panel 11 is less susceptible to deformation. Therefore, disposing the explosion-proof valve 2 on the first side panel 11 can more effectively ensure that the explosion-proof valve 2 stably and effectively performs its explosion-proof function. Moreover, since the width of the second side plate 12 is larger, the area of ​​the second side plate 12 is larger than the area of ​​the first side plate 11. Therefore, when the internal pressure of the shell 1 increases, the force applied by the second side plate 12 to the pole core is greater than the force applied by the first side plate 11 to the pole core. Therefore, the internal electrolyte and other high-temperature substances of the pole core are more likely to be ejected from the broken position of the first side plate 11, and the internal pressure of the shell 1 is more likely to be released, thereby effectively playing an explosion-proof role.

[0046] The explosion-proof valve 2 is arranged on the first side plate 11, that is, the boss 21 is formed by the first side plate 11 protruding from the inside to the outside, the notch 22 is arranged on the boss 21 formed by the first side plate 11 protruding from the inside to the outside, and the above-mentioned groove 23 is formed by the inner wall surface of the first side plate 11 being recessed from the inside to the outside. The ratio of the second width K2 of the boss 21 to the width K1 of the first side plate 11 is greater than 0.5. When the internal pressure of the shell 1 increases, compared with the case where the ratio of the second width K2 to the width K1 of the first side plate 11 is smaller, the ratio greater than 0.5 can make it easier for the notch 22 to break, thereby making the pressure relief more timely. The height H of the boss 21 is greater than 0.5 mm. Ideally, the thickness of the boss 21 can be equal to the thickness of the first side plate 11 and equal to the depth of the notch 23. The wall surface of the first side plate 11 on the inner side of the runway is flush with the outer wall surface of the first side plate 11 on the outer side of the runway, and the inner wall surface of the first side plate 11 on the inner side of the runway is flush with the inner wall surface of the first side plate 11 on the outer side of the runway.

[0047] In other embodiments, the outer wall surface of the first side plate 11 on the inner side of the runway and the outer wall surface of the shell 1 on the outer side of the first side plate 11 may not be flush.

[0048] It is understandable that in some other embodiments, the explosion-proof valve 2 may be provided on the second side plate 12. Alternatively, as in some other embodiments of the present application, multiple explosion-proof valves 2 may be provided. In this case, the explosion-proof valves 2 may be provided on both the first side plate 11 and the second side plate 12.

[0049] An embodiment of the present utility model also discloses a battery cell, including a pole core and the explosion-proof valve structure described in the above embodiment, wherein the pole core (not shown in the figure) is assembled in the shell 1, and the pole core includes a side surface covered by the shell 1 and two end surfaces for setting electrodes, and the two end surfaces for setting electrodes are arranged opposite to each other.

[0050] In this embodiment, the pole core can be formed into a rectangular parallelepiped by stacking multiple pole pieces. The pole core may include two oppositely disposed end surfaces and multiple side surfaces. At least one of the two oppositely disposed end surfaces of the pole core is used to accommodate the pole core electrode. Preferably, one end surface of the pole core is provided with a positive electrode, and the other end surface is provided with a negative electrode. The housing 1 covers the side surfaces of the pole core, that is, the ends of the pole core are arranged near the ends of the housing 1, and the opposing module components arranged near the electrodes are also arranged near the ends of the housing 1. The multiple side surfaces of the pole core may specifically include two oppositely disposed first side surfaces and two oppositely disposed second side surfaces, wherein the width of the first side surface is smaller than the width of the second side surface.

[0051] Specifically, the housing 1 is arranged to fit on multiple side surfaces of the pole core, wherein the first side plate 11 of the housing 1 is arranged corresponding to the first side surface with a smaller width, and the first side plate 11 of the housing 1 is arranged corresponding to the second side surface with a larger width. Except for the location of the groove 23, the inner wall surface of the first side plate 11 is flush with each other to facilitate fitting with the first side surface of the pole core.

[0052] In some embodiments, the battery cell further includes a positive electrode cover plate and a negative electrode cover plate, which are used to lead out the tabs of the battery cell. The positive electrode cover plate and the negative electrode cover plate are respectively disposed at both ends of the housing 1 and are sealed to both ends of the housing 1. After the electrode core is assembled into the housing 1, the positive electrode cover plate and the negative electrode cover plate respectively seal the two ends of the housing 1, thereby completing the assembly of the battery cell.

[0053] When the battery cell experiences thermal runaway, the pressure inside the housing 1 increases, and the first side plate 11 breaks at the notch 22 of the explosion-proof valve 2. The fracture connects the notch 22 and the groove 23, thereby connecting the inside and outside of the housing 1. The gas inside the housing 1, the electrolyte in the electrode core, or other high-temperature substances are discharged from the fractured crack, thereby reducing the pressure inside the housing 1 and preventing the battery cell from catching fire or exploding. The explosion-proof valve 2 is formed on the side of the housing 1. When the pressure inside the housing 1 increases, the explosion-proof valve 2 opens, and the gas, electrolyte, or other high-temperature substances inside the housing 1 are discharged from the explosion-proof valve 2, which can reduce the damage or impact on the related module components arranged near the two ends of the housing 1. The related module components can be the signal acquisition module of the battery cell and various sensors. Moreover, the explosion-proof valve 2 is integrally formed with the shell 1, that is, the explosion-proof valve 2 is directly stamped from the side of the shell 1, the process is simple, and there is no need to weld the explosion-proof valve 2 separately on the shell 1. The side wall of the shell 1 can be made thinner, which is conducive to reducing production costs, reducing the overall weight of the battery cell, and improving the utilization rate of the internal space of the battery cell.

[0054] Furthermore, the notch 22 is set on the boss 21 formed by the first side plate 11 of the shell 1 protruding from the inside to the outside. According to the force analysis, the boss 21 of this shape can provide a buffer and will not increase the thickness of the shell 1. Compared with the notch 22 being directly set on the flat shell 1, without increasing the material cost, it can reduce the stress generated by vibration at the notch 22, prevent the shell 1 from breaking due to vibration at the notch 22, and prevent the electrolyte inside the shell 1 from flowing out of the shell 1 during production or transportation, and the battery cell from losing its discharge function, thereby extending the service life of the battery cell and improving safety.

[0055] The present utility model also discloses a battery (not shown in the figure), comprising at least one battery cell disclosed in the above embodiment, and the battery cells can be arranged in a matrix. Since the battery cells are described in detail in the above embodiment, they will not be repeated here. Due to the use of the above battery cells, the service life of the battery is extended.

[0056] The present utility model also discloses a car (not shown in the figure), comprising an electric drive and the battery disclosed in the above embodiment, wherein the battery is electrically connected to the electric drive. Due to the use of the above battery, the safety of the car is also better guaranteed.

[0057] In summary, the explosion-proof valve structure, battery cell, battery and automobile disclosed by the present invention are characterized in that the interior of the explosion-proof valve structure is hollow for assembling the pole core, and the explosion-proof valve structure includes a shell and an explosion-proof valve, and the shell is used to cover the side of the pole core; the explosion-proof valve and the shell are integrally formed, and the explosion-proof valve is formed on the side of the shell; the explosion-proof valve includes a boss and a notch, and the boss is formed by the side of the shell protruding from the inside to the outside, and the notch is provided on the boss. When the pressure inside the shell increases, the shell breaks at the notch, and the high-temperature material in the shell is ejected from the broken crack to complete the pressure relief. It has at least the following advantages:

[0058] 1. Install the explosion-proof valve on the side of the shell to prevent the high-temperature substances sprayed or leaked from the explosion-proof valve when the explosion-proof valve releases pressure from damaging the electrical components at both ends of the battery cell.

[0059] 2. The explosion-proof valve is integrally formed with the housing, saving production costs and reducing the weight of the battery cell.

[0060] 3. According to the force analysis, the notch is set on the boss. The boss can provide a buffer and will not increase the thickness of the shell. Compared with setting the notch directly on the flat shell, it can reduce the stress caused by vibration at the notch without increasing the material cost, prevent the shell from breaking due to vibration at the notch, and avoid the electrolyte inside the shell from flowing out of the shell during production or transportation, and the battery cell loses its discharge function, thereby extending the service life of the battery cell.

[0061] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and such modifications or substitutions should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. An explosion-proof valve structure, wherein the interior of the explosion-proof valve structure is a hollow structure, characterized in that: The explosion-proof valve structure includes: a shell, used to cover the side of the pole core; and The explosion-proof valve is integrally formed with the shell; the explosion-proof valve includes a boss and a notch, the boss is formed by the side of the shell protruding from the inside to the outside, and the notch is arranged on the boss.

2. The explosion-proof valve structure according to claim 1, characterized in that: The boss is a closed annular structure.

3. The explosion-proof valve structure according to claim 2, characterized in that: The notch is arranged on a side of the boss away from the housing.

4. The explosion-proof valve structure according to claim 3, characterized in that: The notch is a closed ring structure.

5. The explosion-proof valve structure according to claim 4, characterized in that: The explosion-proof valve further comprises a groove, wherein the groove is formed by the inner wall of the side surface of the shell being recessed from the inside to the outside when the side surface of the shell is raised from the inside to the outside to form a boss, and the notch is arranged opposite to the groove.

6. The explosion-proof valve structure according to claim 5, characterized in that: The distance from the edge of the notch to the edge of the boss is in the range of 0.1 mm to 1 mm; the boss is arranged in the middle of the side surface of the shell.

7. The explosion-proof valve structure according to any one of claims 1 to 6, characterized in that: The shell includes two oppositely arranged first side panels and two oppositely arranged second side panels, and the first side panels and the second side panels are sequentially connected to form the shell; the width of the first side panel is smaller than that of the second side panel, and the explosion-proof valve is arranged on the first side panel.

8. A battery cell, characterized in that: It comprises a pole core and the explosion-proof valve structure according to any one of claims 1 to 7, wherein the pole core is assembled in the shell, and the pole core comprises a side surface covered by the shell and two end surfaces for setting electrodes, and the two end surfaces for setting electrodes are arranged opposite to each other.

9. A battery, characterized in that: The invention comprises at least one battery cell according to claim 8, wherein the battery cells are arranged in a matrix.

10. An automobile, characterized in that: The invention comprises an electric drive and the battery according to claim 9, wherein the battery is electrically connected to the electric drive.

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