Shell assembly and battery

Abstract

The invention belongs to the technical field of batteries, and discloses a shell assembly and a battery, the shell assembly is connected with a pole group, the shell assembly comprises a shell body and an anti-explosion valve, the shell body is provided with a mounting hole and a reinforcing rib groove, the anti-explosion valve is arranged in the mounting hole to limit the position of the anti-explosion valve on the shell body, and the anti-explosion valve is arranged in the reinforcing rib groove. The reinforcing rib grooves are formed in the surface, facing the pole group, of the shell body, and the reinforcing rib grooves are formed around the mounting hole. Therefore, the reinforcing rib grooves are formed around the mounting holes, stress concentration can be avoided, stress can be distributed along the reinforcing rib grooves when the shell body is subjected to external impact or the battery cell generates gas, the structural strength between the anti-explosion valve and the shell body is improved, the deformation resistance of the shell body is improved, and liquid leakage and gas leakage caused by deformation of the anti-explosion valve are avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and in particular to a shell assembly and a battery. Background Art

[0002] Batteries are a common energy storage device. Lithium-ion batteries, as power batteries, are widely used in electric vehicles and energy storage fields.

[0003] Lithium-ion batteries include a shell, an electrode group and a cover plate. The existing shell is prone to deformation when the battery cell produces gas. In order to avoid excessive deformation of the shell and affect the normal use of the battery, an explosion-proof valve is usually set at the bottom of the shell to discharge the gas inside the shell to the outside and realize thermal and electrical separation.

[0004] However, since the shell is a semi-finished product and its external dimensions have been finalized, the shell may be deformed under stress during the process of punching the explosion-proof valve hole, and the explosion-proof valve hole may have size differences. In addition, since the bottom surface of the shell is thin, when the shell is subjected to external force or the gas pressure generated inside the battery cell, the shell is easily deformed, and the explosion-proof valve may be deformed, causing leakage of the explosion-proof valve. There are problems such as poor impact resistance of the shell, low structural strength of the connection between the explosion-proof valve and the shell, and concentrated stress. Summary of the invention

[0005] The object of the present invention is to provide a shell assembly and a battery to solve the problems of poor impact resistance of the shell, low structural strength of the connection between the explosion-proof valve and the shell, and relatively concentrated stress.

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

[0007] In a first aspect, a shell assembly is connected to a pole group, the shell assembly comprising: a shell body; an explosion-proof valve, the shell body is provided with a mounting hole and a reinforcing rib groove, the explosion-proof valve is arranged in the mounting hole to limit the position of the explosion-proof valve on the shell body, the reinforcing rib groove is arranged on the surface of the shell body facing the pole group, and the reinforcing rib groove is arranged around the mounting hole.

[0008] Preferably, the shell body is provided with a step, the step is provided on the inner wall of the mounting hole facing one end of the pole group, and the explosion-proof valve is provided on a side of the step away from the pole group.

[0009] Preferably, the end surface of the step facing the pole group is flush with the surface of the shell body facing the pole group.

[0010] Preferably, the thickness of the wall of the shell body on which the explosion-proof valve is arranged is equal to the sum of the thickness of the explosion-proof valve and the height of the step.

[0011] Preferably, the height of the step is H1, the height of the reinforcing rib groove is H2, and 0.2 ≤ H2 / H1 ≤ 0.5 is satisfied.

[0012] Preferably, an inner R corner is provided at the connection of the wall surface of the housing body where the explosion-proof valve is provided and the adjacent wall surface. The radius of the inner R corner is R1, and 0.80 mm ≤ R1 ≤ 1.80 mm is satisfied.

[0013] Preferably, the distance between the reinforcing rib groove and the step is L1, and L1 ≥ 0.50 mm is satisfied; and / or, the distance between the reinforcing rib groove and the inner R corner is L2, and L2 ≥ 0.50 mm is satisfied.

[0014] Preferably, the cross-sectional shape of the reinforcing rib groove is one of a trapezoid, a semi-circle, and a triangle.

[0015] Preferably, the wall thickness of the wall surface of the housing body where the explosion-proof valve is provided is greater than the wall thickness of the other wall surfaces of the housing body.

[0016] In a second aspect, a battery includes a pole group, a cover plate, and the housing assembly as described above. The pole group is disposed inside the housing body, and the cover plate is connected to the housing body.

[0017] Advantages of the present invention:

[0018] A housing assembly is connected to a pole group. The housing assembly includes a housing body and an explosion-proof valve. An installation hole and a reinforcing rib groove are provided on the housing body. The explosion-proof valve is disposed in the installation hole to limit the position of the explosion-proof valve on the housing body. The reinforcing rib groove is provided on the surface of the housing body facing the pole group and surrounds the installation hole.

[0019] In this way, by providing the reinforcing rib groove surrounding the installation hole, stress can be effectively dispersed, avoiding stress concentration at the connection between the explosion-proof valve and the housing body. When gas is generated inside the battery cell and the housing body is subjected to an external impact, deformation of the housing body can be reduced, thereby preventing the housing body from pulling the explosion-proof valve to deform and cause liquid leakage and gas leakage. Buffer stress deformation is achieved, the structural strength of the connection between the explosion-proof valve and the housing body is enhanced, punching the housing body to form the installation hole is facilitated, the size difference of the installation hole is reduced, it is beneficial to the manufacturing process, and the connection stability between the explosion-proof valve and the housing body is improved, thereby improving the safety of the housing assembly. Description of the Drawings

[0020] Figure 1 is the first partial side sectional view of the housing assembly in an embodiment of the present invention;

[0021] Figure 2 is in an embodiment of the present invention Figure 1 Enlarged view of part A;

[0022] Figure 3 It is the first structural schematic diagram of the housing assembly in an embodiment of the present invention;

[0023] Figure 4 It is the first partial structural schematic diagram aiming to show the step in an embodiment of the present invention;

[0024] Figure 5 It is the second partial side sectional view of the housing assembly in an embodiment of the present invention;

[0025] Figure 6 It is the third partial side sectional view of the housing assembly in an embodiment of the present invention;

[0026] Figure 7 It is the fourth partial side sectional view of the housing assembly in an embodiment of the present invention;

[0027] Figure 8 It is the fifth partial side sectional view of the housing assembly in an embodiment of the present invention;

[0028] Figure 9 It is the second structural schematic diagram of the housing assembly in an embodiment of the present invention;

[0029] Figure 10 It is the second partial structural schematic diagram aiming to show the step in an embodiment of the present invention.

[0030] In the figure:

[0031] 1. Housing body; 11. Mounting hole; 12. Reinforcing rib groove; 13. Step; 2. Explosion-proof valve. Detailed implementation manners

[0032] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present invention, rather than limiting the present invention. Additionally, it should be noted that for the convenience of description, only parts related to the present invention are shown in the drawings, rather than all the structures.

[0033] In the description of the present invention, unless otherwise clearly defined and limited, the terms "connected", "connected to", and "fixed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0034] In the present invention, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the contact between the first and second features through additional features therebetween rather than direct contact. Moreover, the first feature being "above", "over" and "on top of" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "beneath" and "underneath" the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the horizontal height of the first feature is less than that of the second feature.

[0035] In the description of this embodiment, the orientation or positional relationships such as "above", "below", "right", etc. are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as a limitation on the present invention. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0036] Refer to Figures 1 to 4 , the present invention provides a housing assembly connected to a pole group. The housing assembly includes a housing body 1 and an explosion-proof valve 2. An installation hole 11 and a reinforcing rib groove 12 are formed on the housing body 1. The explosion-proof valve 2 is disposed in the installation hole 11 to limit the position of the explosion-proof valve 2 on the housing body 1. The reinforcing rib groove 12 is disposed on the surface of the housing body 1 facing the pole group, and the reinforcing rib groove 12 is arranged around the installation hole 11.

[0037] In this embodiment, the explosion-proof valve 2 is a waist-shaped thin sheet structure. The length direction of the explosion-proof valve 2 is parallel to the length direction of the housing body 1. The explosion-proof valve 2 and the bottom surface of the housing body 1 are fixedly connected by welding. The reinforcing rib groove 12 and the installation hole 11 are arranged at intervals, and the shape of the reinforcing rib groove 12 is similar to that of the installation hole 11.

[0038] Thus, by providing the reinforcing rib groove 12 around the installation hole 11, the stress can be effectively dispersed. When gas is generated inside the battery cell and the housing body 1 is subjected to an external impact, the stress will be distributed along the reinforcing rib groove 12, realizing the buffering of stress deformation and releasing the stress concentration. And it can absorb part of the stress through its own elastic deformation, thereby reducing the stress transmitted to the explosion-proof valve 2 and enhancing the connection strength between the explosion-proof valve 2 and the housing body 1, which is beneficial to punching the housing body 1 to form the installation hole 11, making the housing body 1 not easily deformed under the action of stress after punching, improving the connection stability between the explosion-proof valve 2 and the housing body 1, avoiding the deformation of the explosion-proof valve 2 and leakage of liquid and gas, and further improving the safety of the housing assembly.

[0039] It can be understood that the shape of the reinforcing rib groove 12 can be adjusted according to the shape of the explosion-proof valve 2, and it is only necessary to ensure that the edge of the explosion-proof valve 2 is stably connected to the housing body 1, which will not be elaborated here.

[0040] Referring to Figure 5 , in some embodiments, the housing body 1 is provided with a step 13, and the step 13 is arranged on the inner wall of the mounting hole 11 towards the pole group end, and the explosion-proof valve 2 (referring to Figure 3 ) is arranged on the side of the step 13 away from the pole group, that is, the explosion-proof valve 2 and the reinforcing rib groove 12 are respectively arranged on both sides in the thickness direction of the housing body 1.

[0041] In this embodiment, the step 13 protrudes from the mounting hole 11, so that the cross-sectional area of the mounting hole 11 at the end away from the pole group is larger than the cross-sectional area of the mounting hole 11 at the end towards the pole group. Thus, when the explosion-proof valve 2 is located in the mounting hole 11, the explosion-proof valve 2 can be lapped on the step 13, and the end face of the explosion-proof valve 2 away from the pole group is flush with the surface of the housing body 1 away from the pole group.

[0042] In this way, the step 13 can provide stable support for the explosion-proof valve 2, realize the preliminary positioning of the explosion-proof valve 2, reduce the displacement of the explosion-proof valve 2 caused by external force or internal pressure change during assembly and use, and can cooperate with the reinforcing rib groove 12 to jointly disperse stress, avoid excessive stress concentration at the connection between the explosion-proof valve 2 and the mounting hole 11, facilitate the stable welding of the explosion-proof valve 2 and the housing body 1, and the step 13 can improve the structural strength of the housing body 1 at the position where the mounting hole 11 is opened, thereby improving the connection stability between the explosion-proof valve 2 and the housing body 1 and enhancing the overall structural strength of the housing assembly.

[0043] Referring to Figure 5 , in some embodiments, the end face of the step 13 towards the pole group is flush with the surface of the housing body 1 towards the pole group.

[0044] In this embodiment, the longitudinal section of the mounting hole 11 is in a T shape. When the explosion-proof valve 2 is assembled into the mounting hole 11, the side wall of the explosion-proof valve 2 abuts against the side wall of the mounting hole 11, and the end face of the explosion-proof valve 2 towards the pole group abuts against the top surface of the step 13.

[0045] In this way, the step 13 can limit the position of the explosion-proof valve 2, increase the contact area between the explosion-proof valve 2 and the housing body 1, and keep the surface of the housing body 1 flush after the explosion-proof valve 2 is assembled to the housing body 1, thereby improving the connection stability between the explosion-proof valve 2 and the housing body 1; both the step 13 and the rib groove 12 are provided on the surface of the housing body 1 facing the electrode group, which can avoid the low structural strength at the position where the rib groove 12 is formed on the housing body 1, and the combination of the rib groove 12 and the step 13 can make the stress distribution more uniform. The step 13 provides an initial stress buffer, and the ribs can further guide the stress distribution, so that the housing body 1 can reduce deformation when subjected to external impacts and gas generated by the battery cell, and reduce the risk of liquid leakage and gas leakage of the explosion-proof valve 2 due to the deformation of the housing body 1, thereby improving the sealing performance and safety of the housing assembly.

[0046] It can be understood that the end face of the step 13 facing the electrode group is flush with the surface of the housing body 1 facing the electrode group. This can not only improve the structural strength at the connection between the housing body 1 and the explosion-proof valve 2, but also facilitate the processing of the housing body 1, simplify the processing process, improve production efficiency, and under the action of the rib groove 12, can disperse stress, make the dimensions of the mounting hole 11 uniform after forming, be beneficial to the manufacturing process, and reduce processing errors.

[0047] Refer to Figure 3 and Figure 5 In some embodiments, the wall thickness of the housing body 1 where the explosion-proof valve 2 is provided is equal to the sum of the thickness of the explosion-proof valve 2 and the height of the step 13.

[0048] In this embodiment, the explosion-proof valve 2 is provided on the bottom wall of the housing body 1, that is, the wall thickness of the bottom wall is equal to the sum of the thickness of the explosion-proof valve 2 and the height of the step 13, so that when the explosion-proof valve 2 is located in the mounting hole 11, the end face of the explosion-proof valve 2 facing away from the electrode group can be flush with the surface of the housing body 1 facing away from the electrode group.

[0049] In this way, when the explosion-proof valve 2 is assembled to the mounting hole 11 and the step 13 supports the explosion-proof valve 2, it can not only achieve the rapid assembly of the explosion-proof valve 2, but also enable the explosion-proof valve 2 to be stably supported during welding with the housing body 1. The wall height of the bottom wall is equal to the sum of the thickness of the explosion-proof valve 2 and the height of the step 13, which can keep the surface of the housing body 1 facing away from the electrode group flush after the explosion-proof valve 2 is assembled, and enable the step 13 to have sufficient structural strength to limit and support the explosion-proof valve 2, effectively utilizing the wall thickness of the housing body 1. Under the action of the rib groove 12, the structural strength and sealing performance at the connection between the explosion-proof valve 2 and the housing body 1 can be improved.

[0050] It can be understood that if the wall thickness of the housing body 1 where the explosion-proof valve 2 is provided is less than the sum of the thickness of the explosion-proof valve 2 and the height of the step 13, it will cause the explosion-proof valve 2 to protrude from the surface of the housing body 1 facing away from the electrode group, which is not conducive to fixedly connecting the explosion-proof valve 2 to the housing body 1 by welding, and will cause the surface of the housing body 1 to be uneven, which may cause the explosion-proof valve 2 to rub against external objects and affect the normal use of the explosion-proof valve 2; if the wall thickness of the housing body 1 where the explosion-proof valve 2 is provided is greater than the sum of the thickness of the explosion-proof valve 2 and the height of the step 13, it will cause the explosion-proof valve 2 to be concave with respect to the surface of the housing body 1 facing away from the electrode group, which is also not conducive to welding the explosion-proof valve 2 to the housing body 1 and will cause the surface of the housing body 1 to be uneven.

[0051] Referring to Figure 5 , in some embodiments, the height of the step 13 is H1, and the height of the reinforcing rib groove 12 is H2, and 0.2 ≤ H2 / H1 ≤ 0.5 is satisfied. Exemplarily, H2 / H1 can be 0.5, 0.4, 0.3, 0.2. In this embodiment, the height direction of the reinforcing rib groove 12 is parallel to the wall thickness direction of the housing body 1.

[0052] In this way, the height H2 of the reinforcing rib groove 12 is not higher than half of the height H1 of the step 13, which can avoid the structural strength of the housing body 1 from decreasing due to the too deep opening of the reinforcing rib groove 12, thereby causing the housing body 1 to deform when subjected to external impact or when the battery cell generates gas, improving the structural strength at the connection between the explosion-proof valve 2 and the housing body 1, avoiding the deformation of the housing body 1 and pulling the explosion-proof valve 2 to deform, resulting in liquid leakage and gas leakage of the explosion-proof valve 2, and improving the safety and stability of the housing assembly.

[0053] It can be understood that the height H2 of the reinforcing rib groove 12 cannot be too small. If it is too small, the stress dispersion effect of the reinforcing rib groove 12 will be poor, and it cannot play a role in buffering stress, and it is difficult to process and form, increasing the processing difficulty of the housing body 1. The height H2 of the reinforcing rib groove 12 cannot be too large either. If it is too large, the structural strength at the positions where the reinforcing rib groove 12 and the mounting hole 11 are opened on the housing body 1 will be too small, so that the housing body 1 is prone to deformation when subjected to external impact or when the battery cell generates gas, and it will pull the explosion-proof valve 2 to cause liquid leakage and gas leakage, reducing the structural strength at the connection between the explosion-proof valve 2 and the housing body 1, and causing the stress to be concentrated, with a large size difference when forming the mounting hole 11 and a low yield rate, which is not conducive to the manufacturing process; the height H2 of the reinforcing rib groove 12 can be adjusted according to the wall thickness of the housing body 1 where the explosion-proof valve 2 is provided and the height H1 of the step 13, and no more examples will be listed here.

[0054] Referring to Figure 5, in some embodiments, an internal R corner is provided at the connection between the wall surface of the housing body 1 where the explosion-proof valve 2 is provided (i.e., the bottom surface of the housing body 1) and its adjacent wall surface (i.e., the side surface of the housing body 1). The radius of the internal R corner is R1, and 0.80 mm ≤ R1 ≤ 1.80 mm is satisfied.

[0055] In this embodiment, the bottom surface and the side surface of the housing body 1 are integrally formed, and the bottom surface and the side surface of the housing body 1 are vertically arranged by bending. Therefore, there is a smooth transition with an internal R corner at the connection. The radius R1 of the internal R corner can be any value between 0.80 mm and 1.80 mm or the range between any two values, such as 0.80 mm, 0.90 mm, 1.00 mm, 1.20 mm, 1.40 mm, 1.60 mm, 1.80 mm, etc.

[0056] In this way, the internal R corner can avoid stress concentration, enabling the wall surface of the housing body 1 where the explosion-proof valve 2 is provided to evenly disperse the stress to the reinforcing rib groove 12 and its adjacent wall surface when subjected to external impact or when the battery cell generates gas, improving the impact resistance of the overall structure of the housing body 1, avoiding local deformation of the housing body 1 when facing high pressure or high impact force, reducing the risk of the housing body 1 pulling the explosion-proof valve 2 and causing liquid leakage and gas leakage of the explosion-proof valve 2, improving the structural strength at the connection between the explosion-proof valve 2 and the housing body 1, and dispersing the stress of the housing body 1 to avoid stress concentration.

[0057] It can be understood that the radius R1 of the internal R corner cannot be too small, otherwise stress concentration will occur at the position of the internal R corner of the housing body 1, affecting the welding quality of the explosion-proof valve 2. The radius R1 of the internal R corner cannot be too large either, otherwise the volume of the housing body 1 will increase, reducing the space utilization rate inside the housing body 1. The radius R1 of the internal R corner can be flexibly adjusted according to the specifications of the housing body 1 and design requirements, as long as it can make the bottom surface and the side surface of the housing body 1 be at an angle. Details are not elaborated here.

[0058] Refer to Figure 5 , in some embodiments, the distance between the reinforcing rib groove 12 and the step 13 is L1, and L1 ≥ 0.50 mm is satisfied. The distance between the reinforcing rib groove 12 and the internal R corner is L2, and L2 ≥ 0.50 mm is satisfied. That is, the reinforcing rib groove 12 is spaced from both the step 13 and the internal R corner.

[0059] It should be noted that the distance L1 between the reinforcing rib groove 12 and the step 13 is also the distance between the inner edge of the reinforcing rib groove 12 and the inner wall of the mounting hole 11 without the step 13. The distance L2 between the reinforcing rib groove 12 and the internal R corner is also the distance between the outer edge of the reinforcing rib groove 12 and the edge of the internal R corner facing the step 13.

[0060] Exemplarily, the distance L1 between the reinforcing rib groove 12 and the step 13 can be 0.50 mm, 0.60 mm, 0.70 mm, 0.80 mm, 0.90 mm, 1.00 mm, etc., and the distance L2 between the reinforcing rib groove 12 and the inner R corner can be 0.50 mm, 0.60 mm, 0.70 mm, 0.80 mm, 0.90 mm, 1.00 mm, etc.

[0061] In this way, the reinforcing rib groove 12 and the step 13 are arranged at intervals, which can avoid interference with the mounting hole 11 and affect the formation of the mounting hole 11, so that the position of the mounting hole 11 opened on the housing body 1 can have high structural strength, and the stress at the mounting hole 11 can be evenly dispersed to the reinforcing rib groove 12. When the housing body 1 is subjected to external force or the battery core generates gas, the reinforcing rib groove 12 can buffer the stress to reduce the dimensional error of the mounting hole 11, and the step 13 can provide stable support for the explosion-proof valve 2, improving the structural strength of the connection between the explosion-proof valve 2 and the housing body 1, and avoiding deformation at the connection between the explosion-proof valve 2 and the housing body 1 caused by stress concentration and pulling the explosion-proof valve 2 to cause liquid leakage and gas leakage. The reinforcing rib groove 12 and the inner R corner are arranged at intervals, which can avoid deformation of the inner R corner when the reinforcing rib groove 12 is formed and interference with the electrode group, improving the stability and safety of the overall structure of the battery.

[0062] It can be understood that the distance L1 between the reinforcing rib groove 12 and the step 13 cannot be too small, otherwise the structural strength of the step 13 will decrease and affect the formation of the mounting hole 11. The distance L2 between the reinforcing rib groove 12 and the step 13 cannot be too large either, otherwise it will be difficult to disperse the stress at the connection between the explosion-proof valve 2 and the housing body 1, resulting in deformation of the housing body 1 when subjected to external impact or the battery core generates gas. The distance L2 between the reinforcing rib groove 12 and the inner R corner cannot be too small, otherwise the inner R corner will deform, further causing a change in the structural strength of the housing body 1 and resulting in local stress concentration. The distance L2 between the reinforcing rib groove 12 and the inner R corner cannot be too large either, otherwise it will be too close to the step 13, reducing the effect of buffering stress. The distance L1 between the reinforcing rib groove 12 and the step 13 and the distance L2 between the reinforcing rib groove 12 and the inner R corner can both be adjusted according to the size of the mounting hole 11 and the distance between the mounting hole 11 and the inner R corner, and will not be listed in detail here.

[0063] To verify the rationality of the ranges of the height H1 of the step 13, the height H2 of the reinforcing rib groove 12, the distance L1 between the reinforcing rib groove 12 and the step 13, and the distance L2 between the reinforcing rib groove 12 and the inner R corner, as shown in Table 1, this embodiment provides ten sets of examples and eight sets of comparative examples for illustration.

[0064] Table 1

[0065]

[0066] As can be seen from Examples 1 to 10 in Table 1, after meeting the range limitations, the rib groove 12 has the function of buffering the strain of the explosion-proof valve 2, avoiding stress concentration at the connection between the explosion-proof valve 2 and the housing body 1, and not causing deformation of the inner R corner and the step 13.

[0067] As can be seen from Comparative Example 1 and Comparative Example 2 in Table 1, if the rib groove 12 is too shallow (i.e., the height H2 of the rib groove 12 is too small), the rib groove 12 cannot play the role of buffering the strain of the explosion-proof valve 2.

[0068] As can be seen from Comparative Example 3 and Comparative Example 4 in Table 1, if the rib groove 12 is too deep (i.e., the height H2 of the rib groove 12 is too large), the structural strength of the position of the housing body 1 where the rib groove 12 is provided will be reduced, increasing the risk of deformation, affecting the installation of the explosion-proof valve 2, and weakening the anti-deformation ability of the housing body 1 and the function of buffering the strain of the explosion-proof valve 2.

[0069] As can be seen from Comparative Example 5 and Comparative Example 6 in Table 1, if the rib groove 12 is too close to the step 13, the structural strength at the step 13 will be reduced, making the position of the explosion-proof valve 2 where the step 13 is provided weak and easy to deform, affecting the installation of the explosion-proof valve 2, and weakening the anti-deformation ability of the housing body 1 and the function of buffering the strain of the explosion-proof valve 2.

[0070] As can be seen from Comparative Example 7 and Comparative Example 8 in Table 1, if the rib groove 12 is too close to the inner R corner (i.e., the distance L2 between the rib groove 12 and the inner R corner is too small), the inner R corner will deform, affecting the insertion of the electrode group into the housing and causing assembly interference with the electrode group.

[0071] Refer to Figures 6 to 8 , in some embodiments, the cross-sectional shape of the rib groove 12 is one of a trapezoid, a semi-circle, and a triangle. In this embodiment, when the cross-sectional shape of the rib groove 12 is a trapezoid, the width of the rib groove 12 at the end away from the electrode group is smaller than the width at the end towards the electrode group, so as to achieve stress guidance and further disperse the stress at the connection between the explosion-proof valve 2 and the housing body 1.

[0072] In this way, for the rib groove 12 with a trapezoidal cross-sectional shape, its shape can guide the stress to be distributed along the hypotenuse; the rib groove 12 with a semi-circular cross-sectional shape has a smooth transition curve, which is convenient for bearing cyclic loads and improving the anti-fatigue performance of the housing body 1; the rib groove 12 with a triangular cross-sectional shape has good stability, improving the compressive performance of the housing body 1 and being beneficial to stress dispersion.

[0073] The width of the reinforcing rib groove 12 towards the end of the electrode group is larger, which can evenly disperse the stress to the housing body 1 in time when the housing body 1 is impacted by the outside world and the battery cell generates gas, so that the stress is distributed along the inner wall of the reinforcing rib groove 12, reducing the stress concentration points, thereby reducing the local deformation of the housing body 1, reducing the dimensional difference of the mounting holes 11, and maintaining the structural strength of the housing body 1; the shape of the reinforcing rib groove 12 is regular, which is convenient for processing and forming, and can reduce the processing difficulty of the housing body 1.

[0074] It can be understood that the cross-sectional shape of the reinforcing rib groove 12 can be adjusted according to actual needs, as long as it can disperse the stress of the housing body 1 and improve the structural strength of the connection between the explosion-proof valve 2 and the housing body 1, and no more examples will be listed here.

[0075] Refer to Figure 1 , in some embodiments, the wall thickness of the housing body 1 where the explosion-proof valve 2 is provided is greater than the wall thickness of other walls of the housing body 1, that is, the thickness of the bottom surface of the housing body 1 is greater than the thickness of the top surface and the side surfaces of the housing body 1.

[0076] In this way, there is enough space on the bottom surface of the housing body 1 to stably arrange the explosion-proof valve 2 in the mounting hole 11 and be supported by the step 13, so as to facilitate the fixed connection between the explosion-proof valve 2 and the housing body 1, and enable the bottom surface of the housing body 1 with the reinforcing rib groove 12 to have sufficient structural strength, and it is not easy to deform when the housing body 1 is impacted by the outside world or the battery cell generates gas, improving the structural strength of the connection between the explosion-proof valve 2 and the housing body 1, and realizing the uniform distribution of stress on the housing body 1.

[0077] It can be understood that the thickness of the bottom surface of the housing body 1 can also be equal to the wall thickness of other walls of the housing body 1, as long as it can realize that the bottom surface of the housing body 1 has sufficient thickness for opening the mounting hole 11 and the reinforcing rib groove 12, and no further description will be given here.

[0078] Refer to Figure 3 , the present invention provides a battery, including an electrode group, a cover plate (not shown in the figure) and a housing assembly, the electrode group is arranged inside the housing body 1, and the cover plate is connected to the housing body 1.

[0079] In this embodiment, refer to Figure 3 and Figure 4 , the housing body 1 is a square housing, and the cover plate is connected to the top surface of the housing body 1, and the cover plate is connected with a pole column (not shown in the figure), that is, the pole column and the explosion-proof valve 2 are respectively arranged on the top surface and the bottom surface of the housing body 1.

[0080] Thus, when punching the installation hole 11 in the housing body 1, the reinforcing rib groove 12 can disperse stress and reduce the deformation of the bottom surface of the housing body 1, improve the structural strength of the connection between the explosion-proof valve 2 and the housing body 1, reduce the dimensional difference of the installation hole 11, and facilitate the manufacturing process. After the battery assembly is completed, when the battery core generates gas, the reinforcing rib groove 12 can also reduce the stress concentration at the connection between the explosion-proof valve 2 and the housing body 1, avoid the deformation of the explosion-proof valve 2 caused by the deformation of the bottom surface of the housing body 1, thereby preventing the leakage of liquid and gas from the explosion-proof valve 2, and improving the stability and safety of the battery.

[0081] It can be understood that referring to Figure 9 and Figure 10 , the battery can also be a long battery core battery, that is, there are two covers, and the two covers are respectively arranged at both ends of the housing body 1. Each cover is correspondingly provided with a pole column, and the explosion-proof valve 2 is arranged on the bottom surface of the housing body 1. The type of the battery can be adjusted according to actual design needs and will not be listed in detail here.

[0082] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, rather than limiting the implementation manners of the present invention. For those of ordinary skill in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A housing assembly, characterized in that: Connected to the pole group, the shell assembly includes: Shell body (1); An explosion-proof valve (2), wherein a mounting hole (11) and a reinforcing rib groove (12) are provided on the shell body (1), the explosion-proof valve (2) is arranged on the mounting hole (11) to limit the position of the explosion-proof valve (2) on the shell body (1), the reinforcing rib groove (12) is arranged on the surface of the shell body (1) facing the pole group, and the reinforcing rib groove (12) is arranged around the mounting hole (11).

2. The housing assembly according to claim 1, characterized in that: The shell body (1) is provided with a step (13), and the step (13) is arranged on the inner wall of the mounting hole (11) facing one end of the pole group, and the explosion-proof valve (2) is arranged on a side of the step (13) away from the pole group.

3. The housing assembly according to claim 2, characterized in that: The end surface of the step (13) facing the pole group is flush with the surface of the shell body (1) facing the pole group.

4. The housing assembly according to claim 2, characterized in that: The thickness of the wall of the shell body (1) on which the explosion-proof valve (2) is arranged is equal to the sum of the thickness of the explosion-proof valve (2) and the height of the step (13).

5. The housing assembly according to claim 2, characterized in that: The height of the step (13) is H1, the height of the reinforcing rib groove (12) is H2, and 0.2≤H2 / H1≤0.5 is satisfied.

6. The housing assembly according to claim 2, characterized in that: An inner R angle is provided at the connection between the wall surface of the shell body (1) on which the explosion-proof valve (2) is provided and the adjacent wall surface, and the radius of the inner R angle is R1, and satisfies 0.80mm≤R1≤1.80mm.

7. The housing assembly according to claim 6, characterized in that: The distance between the reinforcing rib groove (12) and the step (13) is L1, and satisfies L1≥0.50mm; and / or the distance between the reinforcing rib groove (12) and the inner R angle is L2, and satisfies L2≥0.50mm.

8. The housing assembly according to any one of claims 1 to 7, characterized in that: The cross-sectional shape of the reinforcing rib groove (12) is one of a trapezoid, a semicircle, and a triangle.

9. The housing assembly according to any one of claims 1 to 7, characterized in that: The thickness of the wall of the shell body (1) on which the explosion-proof valve (2) is arranged is greater than the thickness of other walls of the shell body (1).

10. A battery, characterized in that: It comprises a pole group, a cover plate and a shell assembly as claimed in any one of claims 1 to 9, wherein the pole group is arranged inside the shell body (1), and the cover plate is connected to the shell body (1).

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