Battery shell assembly and battery

Abstract

The utility model relates to the technical field of batteries, and discloses a battery shell assembly and a battery. The battery shell assembly comprises a shell body provided with a liquid injection hole; the sealing glue nail is arranged in the liquid injection hole; the sealing metal nail is arranged on the outer side of the sealing rubber nail and comprises a protruding part, a deformation part and a connecting part, the deformation part is arranged around the periphery of the protruding part, the side, facing the sealing rubber nail, of the protruding part protrudes out of the side, facing the sealing rubber nail, of the deformation part, and the connecting part is arranged around the periphery of the deformation part; the fusion depth of the welding portion between the connecting portion and the shell body is H, the fusion width is B, the extension length of the deformation portion extending from the side close to the protruding portion to the connecting portion is L, and L / (H * B) ranges from 0.8 mm <-1 > to 62.5 mm <-1 >. L / (H * B) is set in a range of 0.8 mm <-1 > to 62.5 mm <-1 >, so that the connection strength between the connection part and the shell body after the sealing metal nail is deformed is ensured, and the influence on the use strength after the sealing metal nail is deformed is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field, concretely relates to battery shell assembly and battery. BACKGROUND

[0002] At present, the power battery needs to use the plastic nail to seal the injection hole after injecting liquid and vacuumizing, and then the metal nail is welded to the top cover. In the helium detection process of the power battery, the sealing effect of the plastic nail may be perfect, but in the use process, with the time aging, the sealing plastic nail may lose the sealing effect. At this time, the sealing of the injection hole depends on the reliability of the welding of the metal nail.

[0003] When the metal nail and the top cover exist poor welding, the helium leakage cannot be detected, and the existence of the poor welding of the metal nail after welding cannot be accurately detected, so that the battery cell with poor welding airtightness of the metal nail cannot be excluded. In the long-term use process, the plastic nail may lose the airtightness due to vibration, aging and other reasons. At this time, the metal nail with poor welding airtightness cannot play a sealing role, and the battery cell leaks. SUMMARY

[0004] Therefore, the utility model provides a battery shell assembly and a battery to solve the problem of poor detection accuracy of the sealing metal nail in helium detection.

[0005] In a first aspect, the utility model provides a battery shell assembly, which comprises: a shell body, the shell body is provided with an injection hole; a sealing rubber nail, at least part of the sealing rubber nail is arranged in the injection hole and seals the injection hole; a sealing metal nail, the sealing metal nail is arranged on the outside of the sealing rubber nail, the sealing metal nail comprises a protruding part, a deformation part and a connecting part, the deformation part is arranged around the outer periphery of the protruding part, the protruding part protrudes from the side of the deformation part facing the sealing rubber nail, the protruding part is arranged on the surface of the shell body along the injection hole, and the normal projection of the connecting part on the surface of the shell body at least partially coincides with the normal projection of the sealing rubber nail on the surface of the shell body. The connecting part is welded and connected with the shell body, the fusion depth of the welding part between the connecting part and the shell body is H, the fusion width is B, the extension length of the deformation part extending from the side close to the protruding part to the connecting part is L, and L / (H* B) is 0.8mm -1 -62.5mm -1 .

[0006] In a second aspect, the utility model further provides a battery, which comprises: the above-mentioned battery shell assembly, comprising a first shell assembly and a second shell assembly, the first shell assembly and the second shell assembly form an accommodating space; a battery cell, arranged inside the accommodating space, the sealing metal nail is arranged on the side away from the battery cell of the sealing rubber nail.

[0007] Beneficial effects: After liquid injection, the sealing glue nail is inserted into the liquid injection hole and seals the liquid injection hole; during helium detection, the sealing metal nail is pressed downward by manual or machine, the sealing metal nail presses the sealing glue nail downward at the same time, until the sealing glue nail is separated from the liquid injection hole, the welding quality of the sealing metal nail can be accurately detected after the sealing glue nail is removed, thereby improving the detection accuracy of the sealing metal nail, and the sealing performance of the battery cell is improved.

[0008] The suitable penetration and width can not only ensure the welding quality, but also reduce the consumption of welding materials and the probability of rework, thereby reducing the cost. When L / (Hx B) is set in the range of 0.8mm -1 -62.5mm -1 , not only the welding strength between the connecting part and the shell body is ensured, but also the connecting strength between the connecting part and the shell body after the deformation of the sealing metal nail is ensured, thereby reducing the influence of the sealing metal nail after deformation on the use strength, and the performance and safety of the battery pack are provided. BRIEF DESCRIPTION OF DRAWINGS

[0009] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the drawings needed in the specific embodiments or the prior art description will be briefly introduced as follows. Obviously, the drawings in the following description are some embodiments of the present application, and those skilled in the art can also obtain other drawings according to these drawings without creative labor.

[0010] Figure 1 It is a perspective view of a battery shell assembly according to an embodiment of the present application.

[0011] Figure 2 It is a top view of the battery shell assembly shown in Figure 1 .

[0012] Figure 3 It is a A-A sectional view of the battery shell assembly in Figure 2 .

[0013] Figure 4 It is a B local enlarged view of the battery shell assembly in Figure 3 .

[0014] Figure 5 It is a structural schematic view of the shell body shown in Figure 4 .

[0015] Figure 6 It is a schematic view of the sealing metal nail shown in Figure 4 .

[0016] Figure 7 It is a perspective view of a battery according to an embodiment of the present application.

[0017] Figure 8 For Figure 7 explosion schematic diagram of the battery shown.

[0018] Reference signs:

[0019] 1, shell body; 101, liquid injection hole; 102, groove; 1021, step; 106, cover plate; 107, lower shell;

[0020] 2, sealing glue nail;

[0021] 3, sealing metal nail; 301, protruding part; 302, deformation part; 303, connecting part;

[0022] 4, insulating mesh screen;

[0023] 5, battery cell. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be described clearly and completely below in combination with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0025] The embodiments of the utility model will be described below in combination with Figures 1 to 8 .

[0026] According to the embodiments of the utility model, on the one hand, a battery shell assembly is provided, which comprises a shell body 1, a sealing glue nail 2 and a sealing metal nail 3, the shell body 1 is provided with a liquid injection hole 101; the sealing glue nail 2 is at least partially arranged in the liquid injection hole 101 and seals the liquid injection hole 101; the sealing metal nail 3 is arranged outside the sealing glue nail 2, the sealing metal nail 3 comprises a protruding part 301, a deformation part 302 and a connecting part 303, the deformation part 302 is arranged around the outer periphery of the protruding part 301, the protruding part 301 protrudes from the side of the deformation part 302 towards the sealing glue nail 2, the protruding part 301 is arranged on the surface of the shell body 1 along the liquid injection hole 101, and the normal projection of the protruding part 301 on the surface of the shell body 1 at least partially coincides with the normal projection of the sealing glue nail 2 on the surface of the shell body 1, the connecting part 303 is arranged around the outer periphery of the deformation part 302, the connecting part 303 is welded to the shell body 1, the penetration depth of the welded part between the connecting part 303 and the shell body 1 is H, the penetration width is B, the extension length of the deformation part 302 extending from the side close to the protruding part 301 to the connecting part 303 is L, and L / (H x B) is 0.8mm -1 -62.5mm -1 .

[0027] The battery shell assembly of the embodiment is used to insert the sealing glue nail 2 into the liquid injection hole 101 and seal the liquid injection hole 101 after liquid injection; during helium detection, the sealing metal nail 3 is pressed downward by manual or machine, the sealing metal nail 3 simultaneously presses the sealing glue nail 2 downward, until the sealing glue nail 2 is separated from the liquid injection hole 101, and the welding quality of the sealing metal nail 3 can be accurately detected after the sealing glue nail 2 is removed, thereby improving the detection accuracy of the sealing metal nail 3 and the sealing performance of the battery cell 5.

[0028] During the removal of the sealing glue nail 2, the deformation of the sealing metal nail 3 may reduce the tensile, compressive and shear strength of the sealing metal nail 3, and increase the failure risk of the sealing metal nail 3, thereby affecting the subsequent use strength of the sealing metal nail 3, and thus having a significant impact on the performance and safety of the entire battery pack.

[0029] The penetration and width of the welding position between the connecting part 303 and the shell body 1 are important parameters for measuring the welding quality, and larger penetration and width can enhance the structural strength of the welding position, but excessive penetration may cause excessive burn-through or waste of materials, and excessive width may cause excessive heat input, resulting in welding deformation and poor welding.

[0030] Therefore, appropriate penetration and width can not only ensure the welding quality, but also reduce the consumption of welding materials and the probability of rework, thereby reducing the cost.

[0031] Further, the greater the extension length L of the deformation part 302, the smaller the force applied to the protruding part 301 to move the protruding part 301 up and down, and the smaller the influence on the connecting part 303 during the downward pressing of the sealing glue nail 2, but the greater the extension length of the deformation part 302, the higher the strength requirement of the welded connecting part 303 during use, thereby causing the welding position to break and causing the risk of sealing failure. If the extension length L of the deformation part 302 is smaller, a greater force is applied to the protruding part 301 to move the protruding part 301 up and down, which has a greater influence on the connecting part 303, thereby affecting the connection strength between the connecting part 303 and the shell body 1.

[0032] Therefore, the extension length L of the deformation part 302 and the penetration and width of the welding position between the connecting part 303 and the shell body 1 can affect the connection strength between the connecting part 303 and the shell body 1, and L / (H x B) is set to be within the range of 0.8mm -1 -62.5mm -1 , which not only ensures the welding strength between the connecting part 303 and the shell body 1, but also ensures the connection strength between the connecting part 303 and the shell body 1 after the deformation of the sealing metal nail 3, thereby reducing the influence of the deformation of the sealing metal nail 3 on the use strength and providing the performance and safety of the battery pack.

[0033] Preferably, L / (H x B) is 1, 2, 4, 5, 8, 10, 16, 20, 24, 30, 38, 40, 42, 50, 52, 54, 58 or 60, in units of mm -1 .

[0034] It should be noted that the sealing metal nail 3 is arranged outside the sealing glue nail 2, which means that the sealing glue nail 2 is away from the side of the battery cell 5.

[0035] In one embodiment, as shown in Figure 6 , L is 2mm-10mm. When the sealing glue nail 2 is removed, the larger L is, the smaller the force applied to the protruding part 301 is, the smaller the influence on the connecting part 303 is, and the lower the requirement for the elastic modulus of the deformed part 302 is; when the battery shell assembly is used, the smaller L is, the lower the requirement for the strength of the connecting part 303 is, and the lower the requirement for the elastic modulus of the deformed part 302 is. Therefore, L is in the range of 2mm-10mm, which not only reduces the influence on the connecting part 303 when the sealing glue nail 2 is removed, but also can ensure the connection strength between the connecting part 303 and the shell body 1.

[0036] Preferably, L is 3mm, 4mm, 5mm, 6mm, 7mm, 8mm or 9mm.

[0037] In one embodiment, H is 0.2mm-1.2mm, and B is 0.8mm-2mm. The penetration is also Figure 3 the vertical dimension of the welding position in Figure 3 , and the width of the weld is also Figure 4 the lateral dimension of the welding part in .

[0038] Further, if the penetration is deeper and the width of the weld is wider, the welding strength can be improved, and thus the tensile strength of the welding position is improved, but welding defects are prone to occur, and thus the welding defect rate is high; if the penetration is shallower and the width of the weld is narrower, the welding strength is reduced, and the tensile strength of the welding position is lower, but the welding time can be shortened, the thermal expansion and contraction of the material during the welding process are reduced, and thus the possibility of welding deformation is reduced.

[0039] Therefore, H is in the range of 0.2mm-1.2mm and B is in the range of 0.8mm-2mm, on the one hand, the welding strength and the tensile strength are guaranteed, and welding defects are avoided, and on the other hand, the thermal expansion and contraction of the material during the welding process are reduced, and thus the possibility of welding deformation is reduced.

[0040] Preferably, H is 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm or 1mm, and B is 0.9mm, 1mm, 1.2mm, 1.4mm, 1.6mm, 1.8mm or 1.9mm.

[0041] In one embodiment, as shown in Figure 4 and Figure 6 , the diameter D1 of the protruding part 301 is smaller than the diameter D2 of the sealant nail 2 along the radial direction of the liquid injection hole 101. The diameter D1 of the protruding part 301 is also the transverse dimension of the protruding part 301 in Figure 6 , and the diameter D2 of the sealant nail 2 is also the transverse dimension of the sealant nail 2 in Figure 4 . When the sealing metal nail 3 presses down the sealant nail 2, the protruding part 301 with smaller diameter can facilitate stress concentration, ensure the rapid deformation of the deformed part 302, and reduce the difficulty of removing the sealant nail 2.

[0042] In one embodiment, as shown in Figure 4 and Figure 6 , the ratio of the diameter D1 of the protruding part 301 to the diameter D2 of the sealant nail 2 is 0.4-1.

[0043] Further, if the diameter of the protruding part 301 is too narrow, the pressure generated at the protruding part 301 when removing the sealant nail 2 is too large, which further causes the deformation of the welding part to increase; if the diameter of the protruding part 301 is too wide, the deformed part 302 cannot deform rapidly, which is also not conducive to stress concentration.

[0044] Therefore, the ratio of D1 to D2 is in the range of 0.4-1, which reduces the deformation of the welding part when removing the sealant nail 2, further ensures the connection strength, and also makes the deformed part 302 deform rapidly, facilitating the rapid removal of the sealant nail 2.

[0045] Specifically, the diameter D1 of the protruding part 301 is 0.5mm-3mm, and the diameter D2 of the sealant nail 2 is 1.5mm-6mm.

[0046] Preferably, the diameter D1 of the protruding part 301 is 0.6mm, 0.8mm, 1mm, 1.2mm, 1.4mm, 1.6mm, 1.8mm, 2mm, 2.2mm, 2.4mm, 2.6mm or 2.8mm, and the diameter D2 of the sealant nail 2 is 1.8mm, 2mm, 2.4mm, 2.8mm, 3mm, 3.2mm, 3.4mm, 3.6mm, 4mm, 4.2mm, 4.8mm, 5mm, 5.2mm, 5.8mm.

[0047] In one embodiment, as shown in Figure 6As shown, the thickness T1 of the deformation portion 302 close to the protruding portion 301 is greater than the thickness T2 of the deformation portion 302 close to the connecting portion 303, the thickness of the deformation portion 302 gradually decreases along the direction towards the connecting portion 303, and the ratio of the thickness T1 of the deformation portion 302 close to the protruding portion 301 to the thickness T2 of the deformation portion 302 close to the connecting portion 303 is 1-3.

[0048] Further, if the ratio of T1 to T2 is too large, the strength of the connecting portion 303 is too weak, and the welding position of the connecting portion 303 and the shell body 1 is prone to breakage after the deformation of the deformation portion 302, thereby affecting the safety of the battery; if the ratio of T1 to T2 is too small, the deformation capability of the deformation portion 302 is weak, and the deformation portion 302 is not easy to deform, thereby increasing the difficulty of removing the sealing glue nail 2.

[0049] Therefore, the ratio of T1 to T2 is in the range of 1-3, which not only ensures the structural strength of the connecting portion 303 and avoids the breakage of the welding position, but also facilitates the deformation of the deformation portion 302 and facilitates the quick removal of the sealing glue nail 2.

[0050] Specifically, the thickness T1 of the deformation portion 302 close to the protruding portion 301 is 0.8mm-1.5mm, and the thickness T2 of the deformation portion 302 close to the connecting portion 303 is 0.5mm-1mm.

[0051] Preferably, the thickness T1 of the deformation portion 302 close to the protruding portion 301 is 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm or 1.4mm, and the thickness T2 of the deformation portion 302 close to the connecting portion 303 is 0.6mm, 0.7mm, 0.8mm or 0.9mm.

[0052] In one embodiment, as shown in Figure 6 The thickness T3 of the connecting portion 303 is greater than the thickness T2 of the deformation portion 302 close to the connecting portion 303. The thicker connecting portion 303 can ensure the strength of the connecting portion 303, and also ensure the welding strength between the connecting portion 303 and the shell body 1, thereby ensuring the safety performance of the battery.

[0053] Further, the thickness T3 of the connecting portion 303 is 0.5mm-1.5mm. Preferably, the thickness T3 of the connecting portion 303 is 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm or 1.4mm.

[0054] In one embodiment, as shown in Figure 4 and Figure 6As shown, the protruding size H1 of the protruding portion 301 protruding the deformed portion 302 is greater than the thickness T4 of the part of the shell body 1 close to the liquid injection hole 101, and H1 is less than 2mm. The protruding size H1 of the protruding portion 301 protruding the deformed portion 302 is also Figure 6 the vertical size of the deformed portion 302. Figure 6 the vertical size of the part of the shell body 1 close to the liquid injection hole 101.

[0055] Further, if the protruding size H1 of the protruding portion 301 is too small, the sealant nail 2 cannot be effectively removed; if the protruding size H1 of the protruding portion 301 is too large, more space will be occupied, reducing the space utilization of the battery and the energy density.

[0056] Therefore, H1 is greater than T4 and less than 2mm, which can effectively remove the sealant nail 2 while occupying less space, improve the space utilization of the battery and the energy density.

[0057] Specifically, the protruding size H1 of the protruding portion 301 protruding the deformed portion 302 is 1mm-2mm, and the thickness T4 of the shell body 1 is 1mm-3mm.

[0058] Preferably, the protruding size H1 of the protruding portion 301 protruding the deformed portion 302 is 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.6mm, 1.8mm, 1.9mm, and the thickness T4 of the part of the shell body 1 close to the liquid injection hole 101 is 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.6mm, 1.8mm, 1.9mm, 2mm, 2.2mm, 2.4mm, 2.6mm or 2.8mm.

[0059] In one embodiment, as Figure 5 shown, the shell body 1 is provided with a groove 102 communicating with the liquid injection hole 101, and the edge of the groove 102 is provided with a step 1021, and the connecting portion 303 is arranged at the step 1021, the height H2 of the step 1021 is 0.5mm-1.5mm, and the height H2 of the step 1021 is greater than or equal to the minimum thickness of the deformed portion 302. The height H2 of the step 1021 is also Figure 5 the vertical size of the step 1021.

[0060] Further, if the height of the step 1021 is too low, the connection strength between the connecting portion 303 and the shell body 1 cannot be guaranteed, and the risk of seal failure during use is increased; if the height of the step 1021 is too high, more space will be occupied, reducing the space utilization of the battery and the energy density.

[0061] Therefore, the height H2 of the step 1021 is in the range of 0.5mm-1.5mm, which ensures the connection strength between the connecting part 303 and the shell body 1, occupies small space, improves the space utilization of the battery, and has high energy density.

[0062] Preferably, the height H2 of the step 1021 is 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm or 1.4mm.

[0063] In an embodiment, the inner side of the shell body 1 is provided with an insulating mesh screen 4, which surrounds the outer side of the sealing rubber nail 2 to receive the sealing rubber nail 2 when it falls. When the sealing rubber nail 2 is removed, the falling sealing rubber nail 2 is caught by the insulating mesh screen 4, preventing the sealing rubber nail 2 from falling into the inside of the battery cell 5 and causing a safety risk, thereby improving the safety of the battery.

[0064] In an embodiment, the area of the mesh hole of the insulating mesh screen 4 is 40mm 2 -200mm 2 If the area of the mesh hole of the insulating mesh screen 4 is too large, it will not be able to catch the sealing rubber nail 2, which will cause the sealing rubber nail 2 to fall into the inside of the battery cell 5 and cause a safety risk; if the area of the mesh hole of the insulating mesh screen 4 is too small, it will affect the liquid injection efficiency, which may result in a longer production cycle and higher labor cost, thereby increasing the overall production cost.

[0065] Therefore, the area of the mesh hole of the insulating mesh screen 4 is in the range of 40mm 2 -200mm 2 On the one hand, it can catch the falling sealing rubber nail 2, and the safety of the battery is high, and on the other hand, it ensures the liquid injection efficiency and reduces the cost.

[0066] Preferably, the area of the mesh hole of the insulating mesh screen 4 is 50mm 2 , 60mm 2 , 70mm 2 , 80mm 2 , 90mm 2 , 100mm 2 , 120mm 2 , 140mm 2 , 160mm 2 , 180mm 2 .

[0067] It should be noted that the units of L, H, B, D1, D2, T1, T2 are mm, and the area of the mesh hole is mm 2 .

[0068] According to the embodiment of the utility model, on the other hand, still provide a kind of battery, comprising: above-mentioned battery shell subassembly and electric core 5, battery shell subassembly includes first shell subassembly and second shell subassembly, and first shell subassembly and second shell subassembly are formed with accommodating space;Electric core 5 is arranged in the interior of accommodating space, and sealing metal nail 3 is arranged on the side of sealing rubber nail 2 deviating from electric core 5.

[0069] In one embodiment, the first shell assembly is a cover plate 106, and the second shell assembly is a lower shell 107 formed with an accommodating cavity. The liquid injection hole 101 can be disposed on the cover plate 106 or the lower shell 107.

[0070] Although the embodiments of the utility model are described in conjunction with the drawings, various modifications and variations can be made by those skilled in the art without departing from the spirit and scope of the utility model, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A battery casing assembly, characterized in that, include: Shell body (1), wherein the shell body (1) is provided with a liquid injection hole (101); A sealing nail (2) is at least partially disposed in the injection hole (101) and seals the injection hole (101); A sealing metal pin (3) is disposed on the outside of the sealing adhesive pin (2). The sealing metal pin (3) includes a protrusion (301), a deformable portion (302), and a connecting portion (303). The deformable portion (302) is disposed around the outer periphery of the protrusion (301). The protrusion (301) protrudes from the deformable portion (302) on the side facing the sealing adhesive pin (2). The protrusion (301) is disposed along the injection hole (101) on the surface of the shell body (1) with the orthographic projection of the protrusion (301) onto the sealing adhesive pin. (2) The orthographic projections of the shell body (1) on the surface of the shell body (1) at least partially overlap. The connecting part (303) is arranged around the outer periphery of the deformable part (302). The connecting part (303) is welded to the shell body (1). The weld depth of the connecting part (303) and the shell body (1) is H, and the weld width is B. The extension length of the deformable part (302) from the side near the protrusion (301) toward the connecting part (303) is L, and L / (H×B) is 0.8mm. -1 -62.5mm -1 .

2. The battery casing assembly according to claim 1, characterized in that, The value of L is 2mm-10mm.

3. The battery casing assembly according to claim 2, characterized in that, H is 0.2mm-1.2mm, and B is 0.8mm-2mm.

4. The battery housing assembly according to any one of claims 1 to 3, characterized in that, Along the radial direction of the injection hole (101), the diameter D1 of the protrusion (301) is smaller than the diameter D2 of the sealing nail (2).

5. The battery housing assembly according to claim 4, characterized in that, The ratio of the diameter D1 of the protrusion (301) to the diameter D2 of the sealing nail (2) is 0.4-1.

6. The battery housing assembly according to any one of claims 1 to 3, characterized in that, The thickness T1 of the deformable portion (302) near the protrusion (301) is greater than the thickness T2 of the deformable portion (302) near the connecting portion (303). The thickness of the deformable portion (302) gradually decreases in the direction toward the connecting portion (303). The ratio of the thickness T1 of the deformable portion (302) near the protrusion (301) to the thickness T2 of the deformable portion (302) near the connecting portion (303) is 1-3.

7. The battery housing assembly according to any one of claims 1 to 3, characterized in that, The thickness T3 of the connecting part (303) is greater than or equal to the thickness T2 of the deformable part (302) near the connecting part (303).

8. The battery housing assembly according to any one of claims 1 to 3, characterized in that, The protrusion dimension H1 of the protrusion (301) protruding from the deformable part (302) is greater than the thickness T4 of the portion of the shell body (1) near the injection hole (101), and the H1 is less than 2 mm.

9. The battery housing assembly according to any one of claims 1 to 3, characterized in that, The shell body (1) is provided with a groove (102) communicating with the injection hole (101). A step (1021) is provided at the edge of the groove (102). The connecting part (303) is provided at the step (1021). The height H2 of the step (1021) is 0.5mm-1.5mm. The height H2 of the step (1021) is greater than or equal to the minimum thickness of the deformable part (302).

10. The battery housing assembly according to any one of claims 1 to 3, characterized in that, An insulating mesh screen (4) is provided on the inner side of the shell body (1). The insulating mesh screen (4) surrounds the outer side of the sealing nail (2) to catch the sealing nail (2) when it falls.

11. The battery housing assembly according to claim 10, characterized in that, The area of ​​the mesh size of the insulating screen (4) is 40 mm. 2 -200mm 2 .

12. A battery, characterized in that, include: The battery housing assembly according to any one of claims 1 to 11 includes a first housing assembly and a second housing assembly, wherein the first housing assembly and the second housing assembly form a receiving space; The battery cell (5) is disposed inside the receiving space, and the sealing metal nail (3) is disposed on the side of the sealing glue nail (2) away from the battery cell (5).

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