Battery cover plate and battery

Abstract

The invention relates to the technical field of new energy batteries, and discloses a battery cover plate and a battery, and the battery cover plate is characterized in that a first through hole is formed in a cover plate main body; the insulating part comprises a first plastic part and a second plastic part, a second through hole is formed in the first plastic part, and the second through hole is communicated with the first through hole; a third through hole is formed in the second plastic part and is communicated with the first through hole; the injection molding convex hull is embedded into the injection molding hole, the injection molding convex hull is arranged on one of the cover plate main body and the insulating part, the injection molding hole is formed in the other one of the cover plate main body and the insulating part, the height of the injection molding convex hull is H, the depth of the injection molding hole is F, and H is larger than or equal to 0.5 F and smaller than or equal to F. Through the arrangement of the injection molding convex hulls and the injection molding holes, multi-directional contact between the insulating part and the cover plate main body is formed, and then dislocation movement of the insulating part and the cover plate main body is prevented; by limiting the height of the injection molding convex hull and the depth of the injection molding hole, the structural strength of the injection molding convex hull is guaranteed, and the gap between the insulating part and the cover plate body is prevented from being too large.

Description

Technical Field

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

[0002] With the advancement of science and technology, in order to reduce dependence on transmission energy, new energy batteries, as a green energy, have become an important means to deal with energy and environmental problems. The battery cover is an important part of the new energy battery. The existing battery cover, the cover body and the insulating part are only connected by surface contact, and the insulating part and the cover body are prone to misalignment, resulting in a decrease in battery performance. Summary of the invention

[0003] In view of this, the present invention provides a battery cover and a battery to solve the problem that the insulating member and the cover body are easily misaligned, resulting in a decrease in battery performance.

[0004] In the first aspect, the present invention provides a battery cover, comprising: a cover body, provided with a first through-hole; an insulating member, comprising a first plastic member and a second plastic member, wherein the first plastic member is arranged on one side of the cover body, the first plastic member is provided with a second through-hole, and the second through-hole is connected to the first through-hole; the second plastic member is arranged on a side of the cover body away from the first plastic member, the second plastic member is provided with a third through-hole, and the third through-hole is connected to the first through-hole; the battery cover also includes an injection molding bulge and an injection molding hole, the injection molding bulge is embedded in the injection molding hole, the injection molding bulge is arranged in one of the cover body and the insulating member, and the injection molding hole is arranged in the other of the cover body and the insulating member, and along the z direction, the height of the injection molding bulge is H, and the depth of the injection molding hole is F, satisfying 0.5F≤H≤F.

[0005] Beneficial effect: By setting the injection molding bulge and the injection molding hole, the injection molding bulge abuts against the hole wall of the injection molding hole to form multi-directional contact between the insulating part and the cover plate body. The hole wall of the injection molding hole limits the movement of the injection molding bulge, thereby preventing the insulating part and the cover plate body from being misaligned. By limiting the height of the injection molding bulge and the depth of the injection molding hole, while ensuring the structural strength of the injection molding bulge, the gap between the insulating part and the cover plate body is prevented from being too large.

[0006] In an optional implementation, the injection molding convex bump is arranged on the cover plate body, and the injection molding hole is opened on the first plastic part and / or the second plastic part.

[0007] In an optional implementation, the injection molding hole is opened on the cover plate body, and the injection molding convex bump is arranged on the first plastic part and / or the second plastic part.

[0008] Beneficial effect: The multi-position arrangement of the injection holes and the injection convex bumps further improves the anti-misalignment capability between the insulating member and the cover plate body.

[0009] In an optional implementation, along the z direction, the thickness of the first plastic part is J, satisfying 0.5J≤H≤3J.

[0010] Beneficial effect: By limiting the size of the injection-molded convex hull, the difficulty in molding the injection-molded convex hull is avoided while ensuring the structural strength of the injection-molded convex hull.

[0011] In an optional implementation, along the xy plane, the maximum width of the injection-molded convex hull is V, and the maximum width V of the injection-molded convex hull and the thickness J of the first plastic part satisfy 0.5J≤V≤5J.

[0012] Beneficial effect: By limiting the size of the injection-molded convex hull, the difficulty in molding the injection-molded convex hull is avoided while ensuring the structural strength of the injection-molded convex hull.

[0013] In an optional implementation, along the z direction, the thickness of the second plastic part is G, satisfying 0.5G≤H≤3G.

[0014] Beneficial effect: By limiting the size of the injection-molded convex hull, the difficulty in molding the injection-molded convex hull is avoided while ensuring the structural strength of the injection-molded convex hull.

[0015] In an optional implementation, along the xy plane, the maximum width of the injection-molded convex hull is V, and the maximum width V of the injection-molded convex hull and the thickness G of the second plastic part satisfy 0.5G≤V≤5G.

[0016] Beneficial effect: By limiting the size of the injection-molded convex hull, the difficulty in molding the injection-molded convex hull is avoided while ensuring the structural strength of the injection-molded convex hull.

[0017] In an optional embodiment, at least one of the injection molding bulges is arranged on the cover plate body, at least one of the injection molding holes is opened on the first plastic part, along the z direction, the thickness of the cover plate body is t, and the distance from the bottom of the injection molding hole to the side of the first plastic part away from the cover plate body is T1, satisfying T1 = (0.6-t) mm; and / or, at least one of the injection molding bulges is arranged on the cover plate body, at least one of the injection molding holes is opened on the second plastic part, along the z direction, the thickness of the cover plate body is t, and the distance from the bottom of the injection molding hole to the side of the second plastic part away from the cover plate body is T2, satisfying T2 = (0.6-t) mm.

[0018] Beneficial effect: By limiting the distance from the bottom of the injection hole to the side of the first plastic part or the second plastic part away from the cover plate body, the insulation of the insulating part is ensured while preventing the height of the insulating part from being too large to affect the battery performance.

[0019] In an optional embodiment, the battery cover further includes an explosion-proof valve, which is disposed on the cover body. A vent hole is provided on the cover body, and the explosion-proof valve is disposed corresponding to the vent hole.

[0020] Beneficial effect: By setting up an explosion-proof valve, when the pressure in the battery is too high, the gas in the battery is discharged to the outside through the explosion-proof valve, thereby ensuring the safety of the battery.

[0021] In a second aspect, the present invention further provides a battery, comprising the above-mentioned battery cover. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 It is a schematic diagram of the structure explosion of the battery cover plate of an embodiment of the present invention (front view);

[0024] Figure 2 It is a schematic diagram of the structure explosion of the battery cover plate of an embodiment of the present invention (reverse);

[0025] Figure 3 A schematic diagram of the top structure of a battery cover plate according to an embodiment of the present invention;

[0026] Figure 4 for Figure 3 BB section view in;

[0027] Figure 5 is a schematic structural diagram of a first plastic part according to an embodiment of the present invention;

[0028] Figure 6 It is a schematic cross-sectional view of a part of the structure before the first plastic part and the cover plate body are assembled in an embodiment of the present invention;

[0029] Figure 7 It is a schematic cross-sectional view of a part of the structure after the first plastic part and the cover plate body are assembled in an embodiment of the present invention;

[0030] Figure 8 is a schematic structural diagram of a second plastic part according to an embodiment of the present invention;

[0031] Fig. 9 It is a schematic cross-sectional view of a part of the structure before the second plastic part and the cover plate body are assembled in an embodiment of the present invention;

[0032] Fig.10 It is a schematic cross-sectional view of a portion of the structure after the second plastic component and the cover plate body are assembled according to an embodiment of the present invention.

[0033] Description of reference numerals:

[0034] 10. Cover plate body; 11. First perforation; 12. Ventilation hole; 21. First plastic part; 211. Second perforation; 22. Second plastic part; 221. Third perforation; 30. Injection molding convex bump; 40. Injection molding hole; 50. Explosion-proof valve. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0036] Combine the following Figures 1 to 10 , describing an embodiment of the present invention.

[0037] According to an embodiment of the present invention, in a first aspect, a battery cover is provided, comprising a cover body 10, an insulating member, an injection molding convex 30 and an injection molding hole 40. The cover body 10 is provided with a first through hole 11; the insulating member comprises a first plastic member 21 and a second plastic member 22, the first plastic member 21 is arranged on one side of the cover body 10, the first plastic member 21 is provided with a second through hole 211, and the second through hole 211 is connected to the first through hole 11; the second plastic member 22 is arranged on a side of the cover body 10 away from the first plastic member 21, the second plastic member 22 is provided with a third through hole 221, and the third through hole 221 is connected to the first through hole 11; the injection molding convex 30 is embedded in the injection molding hole 40, the injection molding convex 30 is arranged in one of the cover body 10 and the insulating member, and the injection molding hole 40 is arranged in the other of the cover body 10 and the insulating member, along the z direction, the height of the injection molding convex 30 is H, and the depth of the injection molding hole 40 is F, satisfying 0.5F≤H≤F.

[0038] The battery cover plate of the present embodiment is applied, by providing an injection molding convex bump 30 and an injection molding hole 40, the injection molding convex bump 30 abuts against the hole wall of the injection molding hole 40, thereby forming a multi-directional contact between the insulating member and the cover plate body 10, the hole wall of the injection molding hole 40 limits the movement of the injection molding convex bump 30, thereby preventing the insulating member and the cover plate body 10 from being misaligned; by limiting the size of the height of the injection molding convex bump 30 and the depth of the injection molding hole 40, while ensuring the structural strength of the injection molding convex bump 30, the gap between the insulating member and the cover plate body 10 is prevented from being too large.

[0039] It should be noted that when H is less than 0.5F, the structural strength of the injection molded convex bump 30 is weak, and the height of the injection molded convex bump 30 is too low, and the injection molded convex bump 30 is easy to slip out of the injection hole 40; when H is greater than F, the injection molded convex bump 30 cannot be completely embedded in the injection hole 40, and the portion of the injection molded convex bump 30 exposed outside the injection hole 40 causes an excessively large gap between the insulating part and the cover body 10, affecting the sealing performance of the battery cover. In addition, the excessively high injection molded convex bump 30 makes the battery cover thicker, causing the battery to occupy a larger space.

[0040] Please note that Figure 1 , the xy plane is parallel to the upper surface of the cover body 10 , and the z direction is the thickness direction of the battery cover.

[0041] Specifically, in this embodiment, the injection molding protrusion 30 is disposed on the insulating member, and the injection molding hole 40 is disposed on the cover plate body 10 .

[0042] Specifically, when the injection-molded convex bump 30 is disposed on the insulating component, the injection-molded convex bump 30 and the first plastic component 21 (or the second plastic component 22 ) are integrally injection-molded.

[0043] In one embodiment, Figure 1 and Figure 2 As shown, the injection molding convex bumps 30 are arranged on the first plastic part 21 and the second plastic part 22, and the injection molding holes 40 are opened on the cover body 10. The multi-position arrangement of the injection molding convex bumps 30 further improves the anti-dislocation capability between the insulating part and the cover body 10.

[0044] For details, please refer to Figure 1 and Figure 2 A plurality of injection molding convex bulges 30 and injection molding holes 40 are provided, and a plurality of injection molding convex bulges 30 are provided on the first plastic part 21 at intervals, and a plurality of injection molding convex bulges 30 are provided on the second plastic part 22 at intervals, and a plurality of injection molding holes 40 are provided on the upper and lower sides of the cover body 10 at intervals. The plurality of injection molding convex bulges 30 on the first plastic part 21 correspond one-to-one to the plurality of injection molding holes 40 opened on the upper surface of the cover body 10, and the plurality of injection molding convex bulges 30 on the second plastic part 22 correspond one-to-one to the plurality of injection molding holes 40 opened on the lower surface of the cover body 10.

[0045] In other alternative embodiments, the injection molding convex bump 30 may also be only provided on the upper surface of the cover plate body 10 , and the injection molding hole 40 is only provided on the first plastic part 21 ;

[0046] Alternatively, the injection molding convex bump 30 may also be only provided on the lower surface of the cover plate body 10 , and the injection molding hole 40 may be only provided on the second plastic part 22 ;

[0047] Alternatively, the plurality of injection molding convex bumps 30 may be respectively disposed on the upper and lower surfaces of the cover body 10, and the plurality of injection molding holes 40 may be respectively opened on the first plastic part 21 and the second plastic part 22, wherein the plurality of injection molding holes 40 on the first plastic part 21 correspond one-to-one to the plurality of injection molding convex bumps 30 on the upper surface of the cover body 10, and the plurality of injection molding holes 40 on the second plastic part 22 correspond one-to-one to the plurality of injection molding convex bumps 30 on the lower surface of the cover body 10;

[0048] Alternatively, the injection hole 40 may also be only provided on the upper surface of the cover body 10 , and the injection convex bump 30 may be only provided on the first plastic part 21 ;

[0049] Alternatively, the injection hole 40 may also be only provided on the lower surface of the cover body 10 , and the injection convex bump 30 may be only provided on the second plastic part 22 ;

[0050] Alternatively, multiple injection molding convex bumps 30 can also be respectively arranged on the upper and lower sides of the cover body 10, the first plastic part 21 and the second plastic part 22, and multiple injection molding holes 40 are respectively opened on the upper and lower sides of the cover body 10, the first plastic part 21 and the second plastic part 22. The multiple injection molding convex bumps 30 on the first plastic part 21 correspond one-to-one to the multiple injection molding holes 40 opened on the upper surface of the cover body 10, and the multiple injection molding convex bumps 30 on the second plastic part 22 correspond one-to-one to the multiple injection molding holes 40 opened on the lower surface of the cover body 10. The multiple injection molding holes 40 on the first plastic part 21 correspond one-to-one to the multiple injection molding convex bumps 30 on the upper surface of the cover body 10, and the multiple injection molding holes 40 on the second plastic part 22 correspond one-to-one to the multiple injection molding convex bumps 30 on the lower surface of the cover body 10.

[0051] It should be noted that the locations of the injection molding convex bumps 30 and the injection molding holes 40 can be adjusted according to actual conditions, and the numbers of the injection molding convex bumps 30 and the injection molding holes 40 can also be adjusted according to actual conditions.

[0052] It is worth noting that the multi-position arrangement of the injection holes 40 and the injection convex bumps 30 further improves the anti-misalignment capability between the insulating member and the cover plate body 10 .

[0053] In one embodiment, Figure 5 and Figure 6As shown, along the z direction, the thickness of the first plastic part 21 is J, which satisfies 0.5J≤H≤3J. By limiting the size of the injection-molded convex bump 30, the structural strength of the injection-molded convex bump 30 is ensured while avoiding the difficulty in molding the injection-molded convex bump 30.

[0054] It should be noted that when H is less than 0.5J, the structural strength of the injection-molded convex bump 30 is low, the height of the injection-molded convex bump 30 is low, and the injection-molded convex bump 30 is easy to escape from the injection-molded hole 40; when H is greater than 3J, the injection molding of the injection-molded convex bump 30 is difficult and difficult to mold. Therefore, by limiting the thickness of the first plastic part 21 and the height of the injection-molded convex bump 30, the structural strength of the injection-molded convex bump 30 is ensured while avoiding the difficulty of molding the injection-molded convex bump 30.

[0055] In one embodiment, Figure 5 and Figure 6 As shown, along the xy plane, the maximum width of the injection-molded convex bump 30 is V, and the maximum width V of the injection-molded convex bump 30 and the thickness J of the first plastic part 21 satisfy 0.5J≤V≤5J. By limiting the size of the injection-molded convex bump 30, the structural strength of the injection-molded convex bump 30 is ensured while avoiding the difficulty of molding the injection-molded convex bump 30.

[0056] It should be noted that when V is less than 0.5J, the structural strength of the injection-molded convex bump 30 is low, the maximum width of the injection-molded convex bump 30 is narrow, and the injection-molded convex bump 30 is easy to escape from the injection-molded hole 40; when V is greater than 5J, the injection molding of the injection-molded convex bump 30 is difficult and difficult to mold. Therefore, by limiting the thickness of the first plastic part 21 and the maximum width of the injection-molded convex bump 30, the structural strength of the injection-molded convex bump 30 is ensured while avoiding the difficulty of molding the injection-molded convex bump 30.

[0057] In one embodiment, Figure 5 and Figure 7 As shown, at least one injection molding convex bump 30 is provided on the cover plate body 10, at least one injection molding hole 40 is opened on the first plastic part 21, along the z direction, the thickness of the cover plate body 10 is t, and the distance from the bottom of the injection molding hole 40 to the side of the first plastic part 21 away from the cover plate body 10 is T1, satisfying T1 = (0.6-t) mm. By limiting the distance from the bottom of the injection molding hole 40 to the side of the first plastic part 21 away from the cover plate body 10, while ensuring the insulation of the insulating part, it is prevented that the height of the insulating part is too large to affect the battery performance.

[0058] It should be noted that when the distance from the bottom of the injection hole 40 to the side of the first plastic part 21 away from the cover body 10 is too large, the thickness of the first plastic part 21 will be thicker, which will lead to the thickness of the battery cover being too large, the height of the battery pole is higher, the overall height of the battery cover is increased, and the space occupied by the battery is increased, which will affect the battery's power capacity in the same space; when the distance from the bottom of the injection hole 40 to the side of the first plastic part 21 away from the cover body 10 is too small, the injection molding effect of the injection hole 40 will be poor, and the thickness of the bottom of the injection hole 40 will be too thin and it will be easy to break, which will lead to a high risk of battery insulation failure.

[0059] In one embodiment, Figure 8 and Fig. 9 As shown, along the z direction, the thickness of the second plastic part 22 is G, which satisfies 0.5G≤H≤3G. By limiting the size of the injection-molded convex bump 30, the structural strength of the injection-molded convex bump 30 is ensured while avoiding the difficulty in molding the injection-molded convex bump 30.

[0060] It should be noted that when H is less than 0.5G, the structural strength of the injection-molded convex bump 30 is low, the height of the injection-molded convex bump 30 is low, and the injection-molded convex bump 30 is easy to escape from the injection-molded hole 40; when H is greater than 3G, the injection molding of the injection-molded convex bump 30 is difficult and difficult to mold. Therefore, by limiting the thickness of the second plastic part 22 and the height of the injection-molded convex bump 30, the structural strength of the injection-molded convex bump 30 is ensured while avoiding the difficulty of molding the injection-molded convex bump 30.

[0061] In one embodiment, Figure 8 and Fig. 9 As shown, along the xy plane, the maximum width of the injection-molded convex bump 30 is V, and the maximum width V of the injection-molded convex bump 30 and the thickness G of the second plastic part 22 satisfy 0.5G≤V≤5G. By limiting the size of the injection-molded convex bump 30, the difficulty of molding the injection-molded convex bump 30 is avoided while ensuring the structural strength of the injection-molded convex bump 30.

[0062] It should be noted that when V is less than 0.5G, the structural strength of the injection-molded convex bump 30 is low, the maximum width of the injection-molded convex bump 30 is narrow, and the injection-molded convex bump 30 is easy to escape from the injection hole 40; when V is greater than 5G, the injection molding of the injection-molded convex bump 30 is difficult and difficult to mold. Therefore, by limiting the thickness of the second plastic part 22 and the maximum width of the injection-molded convex bump 30, the structural strength of the injection-molded convex bump 30 is ensured while avoiding the difficulty of molding the injection-molded convex bump 30.

[0063] It should be noted that, in this embodiment, the maximum width of the injection-molded convex bump 30 on the first plastic part 21 is the same as the maximum width of the injection-molded convex bump 30 on the second plastic part 22 .

[0064] In one embodiment, Figure 8 and Fig.10 As shown, at least one injection molding convex bump 30 is provided on the cover plate body 10, at least one injection molding hole 40 is opened on the second plastic part 22, along the z direction, the thickness of the cover plate body 10 is t, and the distance from the bottom of the injection molding hole 40 to the side of the second plastic part 22 away from the cover plate body 10 is T2, satisfying T2 = (0.6-t) mm. By limiting the distance from the bottom of the injection molding hole 40 to the side of the second plastic part 22 away from the cover plate body 10, while ensuring the insulation of the insulating part, it is prevented that the height of the insulating part is too large to affect the battery performance.

[0065] It should be noted that when the distance from the bottom of the injection hole 40 to the side of the second plastic part 22 away from the cover body 10 is too large, the thickness of the second plastic part 22 will be thicker, which will lead to the thickness of the battery cover being too large, the height of the battery pole is higher, the overall height of the battery cover is increased, and the space occupied by the battery is increased, which will affect the battery's power capacity in the same space; when the distance from the bottom of the injection hole 40 to the side of the second plastic part 22 away from the cover body 10 is too small, the injection molding effect of the injection hole 40 will be poor, and the thickness of the bottom of the injection hole 40 will be too thin and it will be easy to break, which will lead to a high risk of battery insulation failure.

[0066] In one embodiment, Figure 1 and Figure 2 As shown, the battery cover also includes an explosion-proof valve 50, which is arranged on the cover body 10. The cover body 10 is provided with a vent hole 12, and the explosion-proof valve 50 is arranged corresponding to the vent hole 12. By arranging the explosion-proof valve 50, when the pressure in the battery is too high, the gas in the battery is discharged outward through the explosion-proof valve 50, thereby ensuring the safety of the battery.

[0067] Next, an anti-detachment test is performed on battery covers of different sizes, and the anti-detachment test includes a vibration test and a pulling test.

[0068] It should be noted that when the battery cover is subjected to a vibration test, the battery cover is placed in a vibration tester, and the connection between the insulating member and the cover body is checked after the test.

[0069] It should be noted that when the battery cover is subjected to a pulling test, one of the insulating member and the cover body is fixed, and a pulling force is applied to the other of the insulating member and the cover body. After the test, the connection between the insulating member and the cover body is checked.

[0070] Next, an anti-detachment test is performed on battery cover plates with injection molding convex bumps 30 of different heights and injection molding holes 40 of different depths. The specific test results are shown in Table 1 below.

[0071] Table 1 Anti-detachment test results 1

[0072]

[0073] Specifically, the pulling force of the pulling test is 25N.

[0074] It can be seen from the test results in Table 1 that in Examples 1 to 7, 0.5F≤H≤F is satisfied. In this case, after the insulating member and the cover body 10 are assembled, vibration tests and pulling tests are performed respectively, and there is no phenomenon of separation between the insulating member and the cover body 10.

[0075] It can be seen from the test results in Table 1 that in Comparative Example 1, H<0.5F. In this case, after the insulating member and the cover body 10 were assembled, a vibration test and a pulling test were performed respectively, and the insulating member and the cover body 10 were separated.

[0076] It should be noted that after the insulating member and the cover body 10 were assembled in the case of H>F, a large gap was found between the insulating member and the cover body 10, and the electrolyte was easily accumulated in this gap, affecting the battery cycle life. Therefore, the case of H>F is not recommended, and the anti-detachment test experiment was not carried out.

[0077] In summary, by limiting 0.5F≤H≤F, the structural strength of the injection-molded convex bump 30 is ensured while preventing the gap between the insulating member and the cover plate body 10 from being too large.

[0078] Next, an anti-detachment test is performed on battery cover plates with injection-molded convex bumps 30 of different heights and first plastic parts 21 of different thicknesses. The specific test results are shown in Table 2 below.

[0079] Table 2 Anti-detachment test results II

[0080]

[0081] Specifically, the pulling force of the pulling test is 25N.

[0082] It can be seen from the test results in Table 2 that in Examples 1 to 6, 0.5J≤H≤3J is satisfied. In this case, after the insulating member and the cover body 10 are assembled, vibration tests and pulling tests are performed respectively, and there is no phenomenon of separation between the insulating member and the cover body 10.

[0083] It can be seen from the test results in Table 2 that in Comparative Example 1, H<0.5J. In this case, after the insulating member and the cover body 10 were assembled, a vibration test and a pulling test were performed respectively, and the insulating member and the cover body 10 were separated.

[0084] It should be noted that when H>3J, due to the high height of the injection molding bump 30, injection molding is difficult, and the plastic shrinks severely after injection molding, affecting the reliability of the connection after injection molding. Therefore, the situation of H>3J is not recommended and no anti-detachment test experiment is performed.

[0085] In summary, by limiting 0.5J≤H≤3J, the structural strength of the injection-molded convex bump 30 is ensured while the reliability of the connection after injection molding is ensured, thereby avoiding the difficulty in molding the injection-molded convex bump 30 .

[0086] Next, an anti-detachment test is performed on battery cover plates with injection-molded convex bumps 30 of different heights and second plastic parts 22 of different thicknesses. The specific test results are shown in Table 3 below.

[0087] Table 3 Anti-detachment test results 3

[0088]

[0089] Specifically, the pulling force of the pulling test is 25N.

[0090] It can be seen from the test results in Table 3 that in Examples 1 to 6, 0.5G≤H≤3G is satisfied. In this case, after the insulating member and the cover body 10 are assembled, vibration tests and pulling tests are performed respectively, and there is no phenomenon of separation between the insulating member and the cover body 10.

[0091] It can be seen from the test results in Table 3 that in Comparative Example 1, H<0.5G. In this case, after the insulating member and the cover body 10 were assembled, a vibration test and a pulling test were performed respectively, and the insulating member and the cover body 10 were separated.

[0092] It should be noted that when H>3G, due to the high height of the injection molding convex bump 30, injection molding is difficult, and the plastic shrinks severely after injection molding, affecting the reliability of the connection after injection molding. Therefore, the situation of H>3G is not recommended and no anti-detachment test experiment is performed.

[0093] In summary, by limiting 0.5G≤H≤3G, the structural strength of the injection-molded convex bump 30 is ensured while the reliability of the connection after injection molding is ensured, thereby avoiding the difficulty in molding the injection-molded convex bump 30 .

[0094] Next, an anti-detachment test is performed on battery cover plates with injection-molded convex bumps 30 of different maximum widths and first plastic parts 21 of different thicknesses. The specific test results are shown in Table 4 below.

[0095] Table 4 Anti-detachment test results 4

[0096]

[0097] Specifically, the pulling force of the pulling test is 25N.

[0098] It can be seen from the test results in Table 4 that in Examples 1 to 6, 0.5J≤V≤3J is satisfied. In this case, after the insulating member and the cover body 10 are assembled, vibration tests and pulling tests are performed respectively, and there is no phenomenon of separation between the insulating member and the cover body 10.

[0099] It can be seen from the test results in Table 4 that in Comparative Example 1, V<0.5J. In this case, after the insulating member and the cover body 10 were assembled, a vibration test and a pulling test were performed respectively, and the insulating member and the cover body 10 were separated.

[0100] It should be noted that in the case of V>3J, since the maximum width of the injection-molded convex bump 30 is large, injection molding is difficult, and the plastic shrinks severely after injection molding, affecting the reliability of the connection after injection molding. Therefore, the case of V>3J is not recommended, and no anti-detachment test experiment is performed.

[0101] In summary, by limiting 0.5J≤V≤3J, the structural strength of the injection-molded convex bump 30 is ensured while the reliability of the connection after injection molding is ensured, thereby avoiding the difficulty in molding the injection-molded convex bump 30 .

[0102] Next, an anti-detachment test is performed on battery cover plates with injection-molded convex bumps 30 of different maximum widths and second plastic parts 22 of different thicknesses. The specific test results are shown in Table 5 below.

[0103] Table 5 Anti-detachment test results 5

[0104]

[0105] Specifically, the pulling force of the pulling test is 25N.

[0106] It can be seen from the test results in Table 5 that in Examples 1 to 6, 0.5G≤V≤3G is satisfied. In this case, after the insulating member and the cover body 10 are assembled, vibration tests and pulling tests are performed respectively, and there is no phenomenon of separation between the insulating member and the cover body 10.

[0107] It can be seen from the test results in Table 5 that in Comparative Example 1, V<0.5G. In this case, after the insulating member and the cover body 10 were assembled, a vibration test and a pulling test were performed respectively, and the insulating member and the cover body 10 were separated.

[0108] It should be noted that in the case of V>3G, since the maximum width of the injection molding convex bump 30 is large, injection molding is difficult, and the plastic shrinks severely after injection molding, affecting the reliability of the connection after injection molding. Therefore, the case of V>3G is not recommended and no anti-detachment test experiment is performed.

[0109] In summary, by limiting 0.5G≤V≤3G, the structural strength of the injection-molded convex bump 30 is ensured while the reliability of the connection after injection molding is ensured, thereby avoiding the difficulty in molding the injection-molded convex bump 30 .

[0110] According to an embodiment of the present invention, in a second aspect, a battery is provided, comprising the above-mentioned battery cover.

[0111] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention. Such modifications and variations are all within the scope defined by the present invention.

Claims

1. A battery cover, characterized in that: include: The cover plate body is provided with a first through hole; The insulating member includes a first plastic member and a second plastic member, wherein the first plastic member is disposed on one side of the cover body, a second through hole is formed on the first plastic member, and the second through hole is connected to the first through hole; the second plastic member is disposed on a side of the cover body away from the first plastic member, a third through hole is formed on the second plastic member, and the third through hole is connected to the first through hole; The battery cover plate also includes an injection molding bulge and an injection molding hole, wherein the injection molding bulge is embedded in the injection molding hole, the injection molding bulge is arranged in one of the cover plate body and the insulating member, and the injection molding hole is arranged in the other of the cover plate body and the insulating member. Along the z direction, the height of the injection molding bulge is H, and the depth of the injection molding hole is F, satisfying 0.5F≤H≤F.

2. The battery cover according to claim 1, characterized in that: The injection molding convex bump is arranged on the cover plate body, and the injection molding hole is opened on the first plastic part and / or the second plastic part.

3. The battery cover according to claim 1, characterized in that: The injection molding hole is opened on the cover plate body, and the injection molding convex bump is arranged on the first plastic part and / or the second plastic part.

4. The battery cover according to any one of claims 1 to 3, characterized in that: Along the z direction, the thickness of the first plastic part is J, satisfying 0.5J≤H≤3J.

5. The battery cover according to claim 4, characterized in that: Along the xy plane, the maximum width of the injection-molded convex hull is V, and the maximum width V of the injection-molded convex hull and the thickness J of the first plastic part satisfy 0.5J≤V≤5J.

6. The battery cover according to any one of claims 1 to 3, characterized in that: Along the z direction, the thickness of the second plastic part is G, satisfying 0.5G≤H≤3G.

7. The battery cover according to claim 6, characterized in that: Along the xy plane, the maximum width of the injection-molded convex hull is V, and the maximum width V of the injection-molded convex hull and the thickness G of the second plastic part satisfy 0.5G≤V≤5G.

8. The battery cover according to any one of claims 1 to 3, characterized in that: At least one of the injection molding convex bumps is arranged on the cover plate body, at least one of the injection molding holes is opened on the first plastic part, along the z direction, the thickness of the cover plate body is t, and the distance from the bottom of the injection molding hole to the side of the first plastic part away from the cover plate body is T1, satisfying T1 = (0.6-t) mm; and / or, At least one of the injection molding convex bumps is arranged on the cover plate body, and at least one of the injection molding holes is opened on the second plastic part. Along the z direction, the thickness of the cover plate body is t, and the distance from the bottom of the injection molding hole to the side of the second plastic part away from the cover plate body is T2, satisfying T2 = (0.6-t) mm.

9. The battery cover according to claim 1 or 2, characterized in that: The battery cover plate further comprises an explosion-proof valve, which is arranged on the cover plate body. A vent hole is provided on the cover plate body, and the explosion-proof valve is arranged corresponding to the vent hole.

10. A battery, characterized in that: A battery cover comprising the battery cover according to any one of claims 1 to 9.

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