Pressure relief assembly, battery shell and battery

Abstract

The utility model relates to a pressure relief assembly, a battery shell and a battery, and belongs to the technical field of batteries. The pressure relief assembly comprises a pressure relief opening and a reinforcing rib structure, and through ingenious combination of the reinforcing rib structure and the pressure relief opening, the tear resistance and the structural integrity of the pressure relief opening are remarkably improved, the expansion stress of the shell is effectively dispersed, and cracking caused by local stress concentration is avoided. In addition, the utility model also comprises a battery shell and a battery, in the battery shell, a pressure relief opening is formed in the bottom of the battery shell, and a pressure relief assembly is matched with an explosion-proof valve for combined use, so that an arc discharge phenomenon under an extreme condition is avoided, high performance, safety and reliability of the battery shell and the battery are ensured, and the service life is prolonged; and the universality and the safety of the application are enhanced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a pressure relief assembly, a battery shell and a battery. BACKGROUND

[0002] With the rapid development of the new energy automobile industry, the safety performance and structural design of the battery pack as the core component of the electric vehicle are facing higher requirements. Under complex driving conditions, the battery pack needs to withstand vibration, impact and thermal shock, and under the trend of high energy density, the contradiction between compactness and safety of the battery pack structure is increasingly prominent. The current mainstream battery pack adopts an aluminum profile shell, and the explosion-proof valve is usually placed on the upper part or side of the shell.

[0003] The traditional battery shell has significant hidden dangers under abnormal conditions: first, the explosion-proof valve peripheral area of the aluminum profile welded structure is prone to cracking due to vibration or charge-discharge cycle stress concentration, which may cause the pressure relief assembly to fail; second, the side placement design of the explosion-proof valve may cause direct contact between high-temperature gas and electrical components during thermal runaway, causing arc discharge (arcing phenomenon), which endangers the safety of the battery pack internal pole group and circuit.

[0004] In summary, the traditional battery shell has obvious defects in structural strength and explosion-proof valve distribution position, and cannot meet the requirements of modern batteries for high performance, high safety and high reliability. SUMMARY

[0005] Therefore, it is necessary to provide a pressure relief assembly, a battery shell and a battery in view of the possible cracking of the pressure relief port and the explosion-proof valve and the arcing phenomenon caused by the side-out of the explosion-proof valve. Specifically, the ingenious combination of the reinforcing rib structure and the pressure relief port significantly improves the tear resistance and structural integrity of the pressure relief port, effectively disperses the shell expansion stress, and avoids cracking caused by local stress concentration. At the same time, the optimized airflow channel design reduces turbulent impact and prolongs the service life of the explosion-proof valve.

[0006] The first aspect of the present application provides a pressure relief assembly, comprising: a pressure relief port placed on the bottom wall of a battery shell, and the side wall thickness of the pressure relief port is greater than the thickness of other side walls; a reinforcing rib structure connected with the inner wall of the pressure relief port and dividing the pressure relief port into at least two exhaust holes; the reinforcing rib structure comprises one of a horizontal rib, a vertical rib and an inclined rib; or the reinforcing rib structure comprises a combination of a horizontal rib and an inclined rib, and the end points of the horizontal rib and the inclined rib are connected; by directly connecting the reinforcing rib structure with the inner wall of the pressure relief port, the tear resistance of the edge of the pressure relief port can be significantly improved, especially when the internal pressure of the battery increases suddenly, the reinforcing rib can disperse the shell expansion stress, avoiding the cracking of the pressure relief port due to local stress concentration; at the same time, the airflow channel is optimized to make the airflow velocity uniform, reduce the impact of turbulent flow on the weak area of the explosion-proof valve, and prolong the service life of the explosion-proof valve.

[0007] In other embodiments, the pressure relief port is in a strip shape, including a first opening direction with a longer inner diameter and a second opening direction with a shorter inner diameter; the strip-shaped pressure relief port design matches the openings in different directions, which can adapt to different shapes of battery casings, improving the versatility and applicability of the pressure relief assembly.

[0008] In other embodiments, when the reinforcing rib structure only includes horizontal ribs, the number of horizontal ribs is multiple, the multiple horizontal ribs are distributed at intervals, and the width of a single horizontal rib is 2%-4% of the maximum inner diameter of the first opening direction; the multiple horizontally distributed horizontal ribs form a "fence" structure, effectively inhibiting the longitudinal deformation of the pressure relief port, while increasing the opening area of the explosion-proof valve area, which is beneficial to the opening of the explosion-proof valve in extreme situations.

[0009] In other embodiments, when the reinforcing rib structure only includes longitudinal ribs, the number of longitudinal ribs is at least three, including a main longitudinal rib and side longitudinal ribs arranged at intervals on both sides of the main longitudinal rib, the main longitudinal rib is arranged along the maximum inner diameter of the first opening direction, the width of the main longitudinal rib is 20%-35% of the maximum inner diameter of the second opening direction, and the width of a single side longitudinal rib is 35%-45% of the width of the main longitudinal rib; the main longitudinal rib is arranged along the maximum inner diameter of the pressure relief port, which can maximize the use of material strength and ensure the structural integrity when the pressure relief port is completely opened; at the same time, the side longitudinal ribs on both sides provide lateral support and increase the opening area of the explosion-proof valve area.

[0010] In other embodiments, when the reinforcing rib structure only includes diagonal ribs, the number of diagonal ribs is multiple and connected end to end on the inner wall of the pressure relief port, and the width of a single reinforcing rib is 2%-4% of the maximum inner diameter of the first opening direction; the diagonal ribs are connected end to end to form a closed loop network structure, which significantly improves the pressure crushing resistance and increases the opening area of the explosion-proof valve area, which is beneficial to the opening of the explosion-proof valve in extreme situations, and is particularly suitable for soft-pack batteries.

[0011] In other embodiments, when the reinforcing rib structure includes horizontal ribs and diagonal ribs, the area surrounded by two adjacent horizontal ribs and the pressure relief port is close to a square, and the diagonal rib located between the two horizontal ribs is arranged along the diagonal of the square area, the width of a single horizontal rib is 2%-6% of the entire first opening direction length, and the width of a single diagonal rib is 2%-4% of the first opening direction length; the horizontal rib and the diagonal rib form a square grid structure, which makes the pressure relief port produce uniform grid deformation when subjected to internal pressure, accurately controls the opening mode of the pressure relief port, avoids local tearing, and improves the stiffness and safety of the explosion-proof valve area.

[0012] The second aspect of the present application provides a battery casing including the above-mentioned pressure relief assembly, further comprising an explosion-proof valve fixedly arranged at the pressure relief port; by integrating the pressure relief assembly, the cell expansion force can be directly transmitted to the reinforcing rib structure through the bottom wall of the casing, avoiding the response delay problem caused by the long force transmission path in traditional design, and improving the safety and reliability of the battery casing.

[0013] In other embodiments, the pressure relief port is provided with a ring groove on the side facing outside of the battery case, and the explosion-proof valve is fixedly connected to the ring groove, the explosion-proof valve is provided with a weak area, and the weak area corresponds to at least one exhaust hole position; the ring groove design increases the contact area of the explosion-proof valve and the case, improving the sealing reliability; the weak area corresponds to the exhaust hole position, ensuring that when the pressure relief threshold is reached, the weak area preferentially ruptures and forms a continuous channel with the exhaust hole, minimizing the resistance of the pressure relief path.

[0014] The third aspect of the application provides a battery comprising a battery case as described above, and a pole group placed in the battery case; by using a battery case with an optimized pressure relief assembly, the safety and reliability of the battery during charging and discharging are improved, and the risk of deformation and cracking of the explosion-proof valve area is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 The structure diagram of the pressure relief assembly and the battery case in Embodiment Two of the application.

[0016] Figure 2 The structure diagram of the pressure relief assembly and the battery case in Embodiment Three of the application.

[0017] Figure 3 The structure diagram of the pressure relief assembly and the battery case in Embodiment Four of the application. Figure 2 The sectional view in the direction of A-A.

[0018] Figure 4 The structure diagram of the pressure relief assembly and the battery case in Embodiment Five of the application.

[0019] Figure 5 The structure diagram of the pressure relief assembly and the battery case in Embodiment Five of the application.

[0020] Figure 6 The top view of the battery case in Embodiment Three of the application.

[0021] Figure 7 The sectional view in the direction of B-B. Figure 2 The sectional view in the direction of B-B.

[0022] Figure 8 The exploded view of the battery of the application.

[0023] REFERENCE SIGNS:

[0024] 10, pressure relief assembly; 20, battery case; 30, pole group; 40, end cover;

[0025] 100, pressure relief port; 1000, explosion-proof valve;

[0026] 101, reinforcing structure; 1011, cross rib; 1012, longitudinal rib; 10121, main longitudinal rib; 10122, side longitudinal rib; 1013, diagonal rib; 102, ring groove;

[0027] 1001, weak area; 1002, connecting area. DETAILED DESCRIPTION

[0028] In order to make the above objectives, features and advantages of the present application more apparent, the specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. It will be apparent, however, to one skilled in the art that the present application can be practiced in a variety of ways beyond the specific embodiments described herein without departing from the spirit of the present application, and that the present application is not limited to the specific embodiments disclosed below.

[0029] In the description of the present application, it should be understood that, if there are terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0030] In addition, if the terms "first", "second" appear, these terms are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features referred to. Therefore, the features defined as "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, if the term "multiple" appears, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise specifically limited.

[0031] In the present application, unless otherwise specifically defined and limited, if the terms "mounting", "connecting", "connecting", "fixing" and the like appear, these terms should be interpreted broadly. For example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise specifically limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0032] In the present application, unless specifically stated and limited otherwise, if there is a description of a first feature "on" or "under" a second feature, etc., it can mean that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature "over", "above" and "on" the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the first feature is higher in horizontal height than the second feature. The first feature "under", "below" and "under" the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the first feature is lower in horizontal height than the second feature.

[0033] It should be noted that if an element is referred to as being "fixed" or "set" to another element, it can be directly on the other element or there can be an intermediate element. If an element is considered to be "connected" to another element, it can be directly connected to the other element or there can be an intermediate element. If present, the terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used in the present application are only for illustrative purposes and do not represent the only implementation.

[0034] Embodiment one

[0035] The embodiment discloses a pressure relief assembly 10, comprising a pressure relief port 100 and a reinforcing rib structure 101;

[0036] Specifically, the reinforcing rib structure 101 is connected with the inner wall of the pressure relief port 100 and divides the pressure relief port 100 into at least two exhaust holes. By directly connecting the reinforcing rib structure 101 with the inner wall of the pressure relief port 100, the tearing resistance of the edge of the pressure relief port 100 can be significantly improved. Especially when the internal pressure of the battery increases suddenly, the reinforcing rib can disperse the expansion stress of the shell and avoid the pressure relief port 100 from cracking due to local stress concentration.

[0037] The reinforcing rib structure 101 in the embodiment comprises one of a horizontal rib 1011, a vertical rib 1012 and an inclined rib 1013. The combination design of the horizontal rib 1011, the vertical rib 1012 and the inclined rib 1013 further optimizes the airflow channel. When the gas passes through the divided multiple exhaust holes, the airflow velocity tends to be uniform, reducing the impact of turbulence on the weak area 1001 of the explosion-proof valve 1000, and prolonging the service life of the explosion-proof valve 1000.

[0038] Specifically, in this embodiment, the pressure relief port 100 is elongated, and its specific structure includes a rectangle, an ellipse, or an oblong shape. In this embodiment, an oblong shape is used as an example. It includes a first opening direction with a longer inner diameter and a second opening direction with a shorter inner diameter. The first opening direction is longitudinal, and the second opening direction is transverse. In this embodiment, the transverse rib 1011 is parallel to the second opening direction, the longitudinal rib 1012 is parallel to the first opening direction, and the oblique rib 1013 is inclined to either the first or second opening direction.

[0039] In another embodiment, the pressure relief port 100 is circular or square, and its inner diameter is the same in the first opening direction and the second opening direction. That is, the horizontal rib 1011 can be set in either the first opening direction or the second opening direction. Similarly, the longitudinal rib 1012 can be set in either the first opening direction or the second opening direction. The diagonal rib 1013 is also inclined in either the first opening direction or the second opening direction.

[0040] In another embodiment, the reinforcing rib structure 101 includes a combination of horizontal ribs 1011 and diagonal ribs 1013, with the endpoints of the horizontal ribs 1011 and diagonal ribs 1013 connected. Furthermore, the design of the endpoints of the horizontal ribs 1011 and diagonal ribs 1013 connected forms a continuous support network, which minimizes the amount of material used while ensuring structural strength, making it suitable for weight-sensitive electric vehicle battery scenarios.

[0041] Example 2

[0042] like Figure 1 As shown, this embodiment discloses a reinforcing rib structure 101. When the reinforcing rib structure 101 in this embodiment only includes horizontal ribs 1011, there are multiple horizontal ribs 1011, which are distributed at intervals, and the width of a single horizontal rib 1011 is 2%-4% of the entire opening length. The multiple spaced horizontal ribs 1011 form a fence-like structure, and their spacing can be dynamically adjusted according to the thickness of the battery casing 20. When the internal pressure of the battery increases, the horizontal ribs 1011 convert the casing expansion stress into lateral tensile force, effectively suppressing the longitudinal deformation of the pressure relief port 100.

[0043] The width of a single transverse rib 1011 is limited to 2%-4% of the opening length, which can both prevent the exhaust channel from being blocked due to the transverse rib 1011 being too wide and ensure that it has sufficient section modulus to resist bending stress.

[0044] This structural design increases the opening area, i.e., the pressure relief area, of the explosion-proof valve 1000, which is beneficial for the opening of the explosion-proof valve 1000 under extreme conditions. At the same time, the arrangement of the transverse reinforcing ribs is relatively simple, easy to form, and consistent with the expansion direction of the pole group 30, which helps to improve the rigidity of the explosion-proof valve 1000 area and reduce the risk of deformation and cracking in the weak area 1001 of the explosion-proof valve 1000.

[0045] Example 3

[0046] like Figures 2-3 As shown, this embodiment discloses a reinforcing rib structure 101. When the reinforcing rib structure 101 in this embodiment only includes longitudinal ribs 1012, the number of longitudinal ribs 1012 is at least three, including a main longitudinal rib 10121 and side longitudinal ribs 10122 spaced apart on both sides of the main longitudinal rib 10121. The main longitudinal rib 10121 is arranged along the maximum inner diameter of the pressure relief port 100.

[0047] The width of the main longitudinal rib 10121 is 20%-35% of the length in the second opening direction, and the width of a single side longitudinal rib 10122 is 35%-45% of the width of the main longitudinal rib 10121. The main longitudinal rib 10121 is arranged along the maximum inner diameter of the pressure relief port 100 to maximize the use of material strength. The width of the main longitudinal rib 10121 is 20%-35% of the length in the second opening direction, ensuring that the main longitudinal rib 10121 can still maintain structural integrity when the pressure relief port 100 is fully open, and avoiding the risk of short circuit caused by broken fragments entering the battery.

[0048] Meanwhile, the side longitudinal ribs 10122, through width ratio control (35%-45%), provide lateral support for the main longitudinal rib 10121 while avoiding the impact on pressure relief response speed due to excessive width of the side longitudinal ribs 10122. This structural design also increases the opening area of ​​the explosion-proof valve 1000 region, i.e., the pressure relief area, which is beneficial for the opening of the explosion-proof valve 1000 under extreme conditions. Furthermore, the arrangement of these longitudinal ribs 1012 is relatively simple, easy to form, and perpendicular to the expansion direction of the pole group 30, making it suitable for small pole group 30 structures. The entire reinforcing rib helps improve the rigidity of the explosion-proof valve 1000 region, reducing the risk of deformation and cracking in the weak area 1001 of the explosion-proof valve 1000.

[0049] This structure is particularly suitable for square battery casings 20, with the main longitudinal ribs 10121 arranged parallel to the long side of the casing, which can match the anisotropic deformation characteristics of square batteries caused by electrode expansion.

[0050] Example 4

[0051] like Figure 4 As shown, this embodiment discloses a reinforcing rib structure 101. When the reinforcing rib structure 101 in this embodiment only includes diagonal ribs 1013, the number of diagonal ribs 1013 is multiple and they are connected end to end to the inner wall of the pressure relief port 100. The width of a single reinforcing rib is 2%-4% of the length in the first opening direction.

[0052] In this embodiment, the diagonal ribs 1013 are connected end to end to form a closed-loop mesh structure, which transforms the circumferential stress on the inner wall of the pressure relief port 100 into the axial tensile force of the diagonal ribs 1013, significantly improving the crush resistance.

[0053] Meanwhile, the width of the diagonal rib 1013 is limited to 2%-4%. While ensuring strength, this structural design increases the opening area, i.e., the pressure relief area, of the explosion-proof valve 1000, which is beneficial for the opening of the explosion-proof valve 1000 under extreme conditions. At the same time, the arrangement of this reinforcing rib structure 101 is relatively simple, easy to form, and at a certain angle to the expansion direction of the electrode assembly 30. This can disperse the force transmitted from the large surface of the outer shell, which helps to improve the rigidity of the explosion-proof valve 1000 area and reduce the risk of deformation and cracking in the weak area 1001 of the explosion-proof valve 1000.

[0054] This design has significant advantages in pouch batteries because the flexible connection of the diagonal rib 1013 can adapt to the irregular deformation of the pouch battery, and the closed-loop structure can prevent electrolyte from seeping out from the gaps between the reinforcing ribs.

[0055] Example 5

[0056] like Figure 5 As shown, this embodiment discloses a reinforcing rib structure 101. When the reinforcing rib structure 101 in this embodiment includes horizontal ribs 1011 and diagonal ribs 1013, the area enclosed by two adjacent horizontal ribs 1011 and the pressure relief port 100 is close to a square, and the diagonal rib 1013 located between the two horizontal ribs 1011 is arranged along the diagonal of the square area. The width of a single horizontal rib 1011 is 2%-6% of the length of the entire first opening direction, and the width of a single diagonal rib 1013 is 2%-4% of the length of the first opening direction.

[0057] In this embodiment, the combination of horizontal ribs 1011 and diagonal ribs 1013 forms a near-square grid structure, which causes the pressure relief port 100 to produce uniform grid-like deformation when subjected to internal pressure, thereby precisely controlling the opening shape of the pressure relief port 100 and avoiding local tearing.

[0058] The square structure is composed of two triangles, which further enhances the rigidity of the explosion-proof valve 1000 area. This reinforcing rib design can improve the connection rigidity of the explosion-proof valve 1000 area, reduce the force transmitted from the large-area bulging deformation of the outer shell during battery charging and discharging, reduce the deformation of the explosion-proof valve 1000 area, especially the deformation of the weak area 1001 of the explosion-proof valve 1000, and thus improve the safety and reliability of the explosion-proof valve 1000 during normal charging and discharging.

[0059] This structure is particularly suitable for high-density batteries, and its 2%-6% width range of 1011 transverse ribs balances the need for high strength and rapid pressure relief.

[0060] Example 6

[0061] like Figures 1-7As shown, the embodiment discloses a battery shell 20, the battery shell 20 of the embodiment, comprising the pressure relief assembly 10 in embodiment one, further comprising an explosion-proof valve 1000 fixedly arranged at the pressure relief port 100. The pressure relief port 100 is arranged on the bottom wall of the battery shell 20, preventing the explosion-proof valve 1000 from being pulled out and generating an arc phenomenon in an extreme case.

[0062] The battery shell 20 in the embodiment is provided with a side wall thickness of the pressure relief port 100 greater than the thickness of other side walls, and at least one pressure relief port 100 is arranged according to the size of the battery shell 20. When the number of pressure relief ports 100 is one, the pressure relief port 100 is arranged at the center of the bottom of the battery shell 20. If the number of pressure relief ports 100 is greater than one, the pressure relief ports 100 are uniformly and intermittently distributed on the bottom of the battery shell 20.

[0063] Meanwhile, the reinforcing rib structure 101 at the pressure relief port 100 in the embodiment is integrally formed with the battery shell 20 by stamping.

[0064] The thickness of the battery shell 20 on the side welded with the explosion-proof valve 1000 is greater than the thickness of the side;

[0065] The side of the pressure relief port 100 facing the outside of the battery shell 20 is provided with a ring groove 102, and the explosion-proof valve 1000 is fixedly connected to the ring groove 102. The explosion-proof valve 1000 and the battery shell 20 (i.e., the pressure relief port 100) are integrally formed by laser welding or the like;

[0066] In the embodiment, the thickness of the horizontal rib 1011, the vertical rib 1012 (including the main vertical rib 10121 and the side vertical rib 10122), and the inclined rib 1013 is the remaining thickness of the pressure relief port 100 excluding the thickness of the ring groove 102.

[0067] The explosion-proof valve 1000 is provided with a weak area 1001 with a V or U-shaped cross section, and the weak area 1001 corresponds to at least one exhaust hole position, facilitating exhaust.

[0068] The ring groove 102 is designed to increase the contact area of the explosion-proof valve 1000 and the battery shell 20, improve the sealing reliability, ensure the filling effect of the sealing glue, and avoid weakening the strength of the shell due to the excessive depth of the groove.

[0069] The weak area 1001 of the explosion-proof valve corresponds to the position of the exhaust hole, which can ensure that when the pressure relief threshold is reached, the weak area 1001 is preferentially broken and forms a continuous channel with the exhaust hole, minimizing the resistance of the pressure relief path.

[0070] The explosion-proof valve 1000 is further provided with a connecting area 1002 corresponding to the ring groove 102 of the battery shell 20, facilitating the connection and fixation of the explosion-proof valve 1000 and the battery shell 20.

[0071] The pressure relief port 100 is arranged on the bottom wall of the battery casing 20 so that the electrolyte will gather downwards when the pressure is released, avoiding arcing under extreme conditions. At the same time, the higher mechanical strength of the bottom wall can withstand greater internal pressure fluctuations.

[0072] Example 7

[0073] like Figure 8 As shown, this embodiment discloses a battery. The battery of this embodiment includes the battery housing 20 of embodiment six and the electrode assembly 30 placed inside the battery housing 20. The battery housing 20 is also provided with end caps 40 that seal the electrode assembly 30. The end caps are located at both ends of the battery housing 20 and are laser welded to the battery housing 20 to form a whole. The characteristics of the battery are mainly presented by the effect of the battery housing 20, which will not be elaborated here.

[0074] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0075] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A pressure relief assembly (10) characterized by, The application relates to a battery shell (20) and a battery (1) comprising the same. The battery shell (20) comprises: a pressure relief port (100) arranged on a bottom wall of the battery shell (20), and a side wall thickness of the pressure relief port (100) is greater than that of other side walls; a reinforcing rib structure (101) connected to an inner wall of the pressure relief port (100) and dividing the pressure relief port (100) into at least two exhaust holes; the reinforcing rib structure (101) comprises one of a horizontal rib (1011), a vertical rib (1012) and an inclined rib (1013); 2. The pressure relief assembly (10) of claim 1, characterized in that: or the reinforcing rib structure (101) comprises a combination of the horizontal rib (1011) and the inclined rib (1013), and end points of the horizontal rib (1011) and the inclined rib (1013) are connected.

3. The pressure relief assembly (10) of claim 1, characterized in that: The pressure relief port (100) is in a strip shape, and comprises a first opening direction with a relatively long inner diameter and a second opening direction with a relatively short inner diameter.

4. The pressure relief assembly (10) of claim 1, characterized in that: When the reinforcing rib structure (101) only comprises the horizontal rib (1011), the number of the horizontal ribs (1011) is multiple, the multiple horizontal ribs (1011) are distributed at intervals, and the width of a single horizontal rib (1011) is 2%-4% of the maximum inner diameter of the first opening direction.

5. The pressure relief assembly (10) of claim 1, characterized in that: When the reinforcing rib structure (101) only comprises the vertical rib (1012), the number of the vertical ribs (1012) is at least three, including a main vertical rib (10121) and side vertical ribs (10122) arranged at intervals on both sides of the main vertical rib (10121), the main vertical rib (10121) is arranged along the maximum inner diameter of the first opening direction, the width of the main vertical rib (10121) is 20%-35% of the maximum inner diameter of the second opening direction, and the width of a single side vertical rib (10122) is 35%-45% of the width of the main vertical rib (10121).

6. The pressure relief assembly (10) of claim 1, characterized in that: When the reinforcing rib structure (101) only comprises the inclined rib (1013), the number of the inclined ribs (1013) is multiple and connected end to end on the inner wall of the pressure relief port (100), and the width of a single reinforcing rib is 2%-4% of the maximum inner diameter of the first opening direction.

7. A battery housing (20) characterized by: When the reinforcing rib structure (101) comprises the horizontal rib (1011) and the inclined rib (1013), two adjacent horizontal ribs (1011) and the pressure relief port (100) form a square area, the inclined rib (1013) between the two horizontal ribs (1011) is arranged along a diagonal line of the square area, the width of a single horizontal rib (1011) is 2%-6% of the entire first opening direction length, and the width of a single inclined rib (1013) is 2%-4% of the first opening direction length.

8. The battery housing (20) of claim 7, characterized in that: The application further discloses a battery (1) comprising the pressure relief assembly (10) of any one of claims 1-6.

9. The battery housing (20) of claim 7, characterized in that: The pressure relief port (100) is provided with a ring groove (102) on a side facing outside of the battery shell (20), and the explosion-proof valve (1000) is fixedly connected to the ring groove (102).

10. A battery, characterized by: The explosion-proof valve (1000) is provided with a weak area (1001). The application further discloses a battery (1) comprising the battery shell (20) of any one of claims 7-9 and a pole group (30) arranged in the battery shell (20).

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