Battery cover plate, single battery, battery pack and vehicle

Abstract

The utility model discloses a battery cover plate, a single battery, a battery pack and a vehicle, the battery cover plate comprises a substrate, a pole and an injection molding part, and the substrate is provided with a pole hole penetrating along the thickness direction of the substrate; a pole hole is formed in the substrate, a first pole bulge and a second pole bulge are arranged on the side surface of the pole, the first pole bulge and the second pole bulge are arranged at an interval along the thickness direction of the substrate, the pole is inserted into the pole hole, and the first pole bulge and the second pole bulge are respectively propped against two sides of the thickness direction of the substrate; and at least one part of the injection molding part is filled between the side surface of the pole and the hole wall of the pole hole. According to the battery cover plate, the shearing force borne by the injection molding part can be reduced, the risk of cracking of the injection molding part is reduced, and the risk of sealing failure of the battery cover plate is further reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of power batteries, and in particular to a battery cover, a single battery, a battery pack and a vehicle. Background Art

[0002] As electric vehicle technology matures, the cost of electric vehicles is also decreasing year by year, and the penetration rate of electric vehicles continues to increase. In electric vehicles, the cost of the power battery system accounts for 40% of the total vehicle cost and is the focus of cost reduction design. At present, in addition to the connection between the substrate and the pole of the battery cover through injection molding, a sealing ring is also required to ensure its sealing. The setting of the sealing ring will not only increase the number of parts of the battery cover, resulting in a higher cost of the battery cover; it will also limit the size of the pole and affect the current capacity of the pole.

[0003] In order to solve the above problems, in addition to connecting the substrate and the pole of some battery covers through injection molded parts, the substrate and the pole are also sealed through injection molded parts. However, injection molded parts are prone to cracking, which leads to sealing failure of the battery cover. Utility Model Content

[0004] To this end, the utility model proposes a battery cover to reduce the risk of sealing failure of the battery cover.

[0005] The battery cover of the utility model comprises a substrate, a pole and an injection molded part, wherein the substrate is provided with a pole hole which penetrates along the thickness direction thereof; a first pole protrusion and a second pole protrusion are provided on the side of the pole, the first pole protrusion and the second pole protrusion are arranged at intervals along the thickness direction of the substrate, the pole is inserted into the pole hole, and the first pole protrusion and the second pole protrusion respectively stop at two sides of the thickness direction of the substrate; at least a part of the injection molded part is filled between the side of the pole and the hole wall of the pole hole.

[0006] Optionally, a hole wall of the pole hole is provided with an avoidance groove penetrating along the thickness direction of the substrate, and the avoidance groove is for the first pole protrusion and / or the second pole protrusion to pass through.

[0007] Optionally, the first pole protrusion and the second pole protrusion have the same shape, and the first pole protrusion and the second pole protrusion have the same size.

[0008] Optionally, a projection of the first pole protrusion on a preset plane and a projection of the second pole protrusion on the preset plane are staggered, wherein the preset plane is perpendicular to the thickness direction of the substrate; and / or, the pole includes a first end face and a second end face arranged relatively to each other along the thickness direction of the substrate, the first pole protrusion is arranged close to the first end face, and the second pole protrusion is arranged close to the second end face; a surface of the first pole protrusion away from the second pole protrusion is flush with the first end face, and / or a surface of the second pole protrusion away from the first pole protrusion is flush with the second end face.

[0009] Optionally, the injection molded part includes an integrally formed sealing tube, a first injection molded protrusion and a second injection molded protrusion, the sealing tube fills between the side of the pole and the hole wall of the pole hole, the first injection molded protrusion and the second injection molded protrusion are respectively arranged at both ends of the sealing tube in the thickness direction of the substrate, and the substrate is clamped between the first injection molded protrusion and the second injection molded protrusion in its thickness direction.

[0010] Optionally, a first gap is provided between the first pole protrusion and the substrate in the thickness direction of the substrate, the first injection molding protrusion is an annular protrusion, and at least a portion of the first injection molding protrusion is filled in the first gap; and / or, a second gap is provided between the second pole protrusion and the substrate in the thickness direction of the substrate, the second injection molding protrusion is an annular protrusion, and at least a portion of the second injection molding protrusion is filled in the second gap.

[0011] Optionally, the substrate includes a thinning portion, the thickness of the thinning portion is smaller than the thickness of the rest of the substrate, and the substrate forms a groove through the thinning portion; the pole hole is arranged in the thinning portion, and at least a portion of the first injection molding protrusion and / or the second injection molding protrusion is filled in the groove.

[0012] The utility model also provides a single battery.

[0013] The single battery of the utility model comprises a shell, a battery cell and a battery cover, wherein the shell has an opening; the battery cell has a pole ear; the battery cover is the battery cover described in any one of the above items, the substrate is connected to the shell and blocks the opening, and the pole is electrically connected to the pole ear.

[0014] The utility model also provides a battery pack.

[0015] The battery pack of the utility model comprises a box body and a plurality of single batteries, wherein the plurality of single batteries are arranged in the box body, and at least one of the single batteries is a single battery as described in any one of the above items.

[0016] The utility model further provides a vehicle.

[0017] The vehicle of the present invention comprises the single battery described in any one of the above items and / or the battery pack described in any one of the above items.

[0018] The battery cover of the utility model realizes the sealing and connection between the pole and the substrate by filling at least a part of the injection molded part between the side of the pole and the hole wall of the pole hole. By setting the first pole protrusion and the second pole protrusion on the side of the pole, and the first pole protrusion and the second pole protrusion respectively stop at both sides of the thickness direction of the substrate, the pole is limited in the thickness direction of the substrate, so that the substrate supports the pole. Therefore, when the pole and the substrate are subjected to a load along the thickness direction of the substrate, part of the load acts on the injection molded part, and the other part of the load acts between the first pole protrusion and the substrate and the second pole protrusion and the substrate, so that the shear force borne by the injection molded part can be reduced, the risk of cracking of the injection molded part is reduced, and the risk of sealing failure of the battery cover is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is an exploded view of a battery cover according to an embodiment of the utility model.

[0020] Figure 2 It is a partial structural schematic diagram of a battery cover plate according to an embodiment of the utility model.

[0021] Figure 3 yes Figure 2 AA view.

[0022] Figure 4 yes Figure 1 Schematic diagram of the structure of the middle substrate.

[0023] Figure 5 yes Figure 1 Schematic diagram of the structure of the middle pole.

[0024] Figure 6 This is a diagram of the assembly process of a battery cover according to an embodiment of the utility model.

[0025] Figure 7 It is a structural schematic diagram of a battery cover plate of another embodiment of the utility model.

[0026] Figure 8 It is a schematic structural diagram of a single battery in one embodiment of the utility model.

[0027] Reference numerals:

[0028] 100. Single battery;

[0029] 10. Battery cover;

[0030] 1. Base plate; 11. Pole hole; 12. Avoidance groove; 13. Thinning portion; 14. Groove; 15. Pressure relief hole;

[0031] 2. Pole; 21. First pole protrusion; 22. Second pole protrusion; 23. First end surface; 24. Second end surface;

[0032] 3. Injection molded part; 31. Sealing cylinder; 32. First injection molded protrusion; 33. Second injection molded protrusion;

[0033] 4. Explosion-proof valve;

[0034] 20. Shell. DETAILED DESCRIPTION

[0035] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but cannot be understood as limiting the present invention.

[0036] like Figures 1 to 7 As shown, the battery cover plate 10 of the utility model embodiment includes a substrate 1, a pole 2 and an injection molded part 3. The side of the pole 2 is provided with a first pole protrusion 21 and a second pole protrusion 22. The first pole protrusion 21 and the second pole protrusion 22 are arranged at intervals along the thickness direction of the substrate 1. The substrate 1 is provided with a pole hole 11 that passes through along the thickness direction thereof, and the pole 2 is inserted into the pole hole 11. At least a portion of the injection molded part 3 is filled between the side of the pole 2 and the hole wall of the pole hole 11. The first pole protrusion 21 and the second pole protrusion 22 are respectively stopped at both sides of the substrate 1 in the thickness direction.

[0037] The battery cover plate 10 of the embodiment of the utility model realizes the sealing and connection between the pole 2 and the substrate 1 by filling at least a part of the injection molded part 3 between the side of the pole 2 and the hole wall of the pole hole 11. By setting the first pole protrusion 21 and the second pole protrusion 22 on the side of the pole 2, and the first pole protrusion 21 and the second pole protrusion 22 respectively stop at both sides of the thickness direction of the substrate 1, the pole 2 is limited in the thickness direction of the substrate 1, so that the substrate 1 supports the pole 2. Therefore, when the pole 2 and the substrate 1 are subjected to a load along the thickness direction of the substrate 1, part of the load acts on the injection molded part 3, and the other part of the load acts between the first pole protrusion 21 and the substrate 1 and the second pole protrusion 22 and the substrate 1, so that the shear force borne by the injection molded part 3 can be reduced, the risk of cracking of the injection molded part 3 is reduced, and the risk of sealing failure of the battery cover plate 10 is reduced.

[0038] In some embodiments, Figure 1 , Figure 4 and Figure 6As shown, the hole wall of the pole hole 11 is provided with an avoidance groove 12 penetrating along the thickness direction of the substrate 1 , and the avoidance groove 12 is for the first pole protrusion 21 and / or the second pole protrusion 22 to pass through.

[0039] like Figure 6 As shown, before the pole 2 and the substrate 1 are assembled, the first pole protrusion 21 and the second pole protrusion 22 are connected to the pole 2 to form a whole. First, as shown in FIG. a, the pole 2 is aligned with the pole hole 11, and the second pole protrusion 22 is aligned with the avoidance groove 12; then, as shown in FIG. b, the pole 2 is passed through the pole hole 11, and one of the first pole protrusion 21 and the second pole protrusion 22 passes through the avoidance groove 12; then, as shown in FIG. c, the pole 2 is rotated so that the first pole protrusion 21 and the second pole protrusion 22 are staggered with the avoidance groove 12 in the circumferential direction; finally, as shown in FIG. d, the injection molded part 3 is injection molded between the substrate 1 and the pole 2.

[0040] The arrangement of the avoidance groove 12 facilitates the assembly of the battery cover plate 10 , which is beneficial to improving the assembly efficiency of the battery cover plate 10 and reducing the manufacturing cost of the battery cover plate 10 .

[0041] Of course, in other embodiments, the avoidance groove 12 may not be provided. In this case, the first pole protrusion 21 may be welded to one end of the pole 2; then, the end of the pole 2 away from the first pole protrusion 21 may be passed through the pole hole 11; then, the second pole protrusion 22 may be welded to the other end of the pole 2; finally, the injection molded part 3 may be injection molded between the substrate 1 and the pole 2.

[0042] Alternatively, if Figure 1 , Figure 5 and Figure 6 As shown, the first pole protrusion 21 and the second pole protrusion 22 have the same shape, and the first pole protrusion 21 and the second pole protrusion 22 have the same size.

[0043] By setting the shapes and sizes of the first pole protrusion 21 and the second pole protrusion 22 to be the same, the first pole protrusion 21 and the second pole protrusion 22 are interchangeable. Therefore, when assembling the pole 2 and the substrate 1, the first pole protrusion 21 and the second pole protrusion 22 can pass through the avoidance groove 12, which is conducive to further improving the assembly efficiency of the battery cover 10 and reducing the manufacturing cost of the battery cover 10.

[0044] Alternatively, if Figure 1 , Figure 5 and Figure 6As shown, the projection of the first pole protrusion 21 on the preset plane and the projection of the second pole protrusion 22 on the preset plane are staggered, wherein the preset plane is perpendicular to the thickness direction of the substrate 1. In other words, the first pole protrusion 21 and the second pole protrusion 22 are arranged in sequence along the circumference of the pole 2, or the first pole protrusion 21 and the second pole protrusion 22 are arranged at intervals along the circumference of the pole 2.

[0045] The above-mentioned design of the first pole protrusion 21 and the second pole protrusion 22 makes it possible for the first pole protrusion 21 and the second pole protrusion 22 to not overlap in the thickness direction of the substrate 1, that is, in the length direction of the pole 2. Thus, the processing and manufacturing of the whole composed of the first pole protrusion 21, the second pole protrusion 22 and the pole 2 is facilitated, which is conducive to further reducing the manufacturing cost of the battery cover 10.

[0046] Optionally, the pole 2, the first pole protrusion 21 and the second pole protrusion 22 are integrally formed.

[0047] For example, the pole 2, the first pole protrusion 21 and the second pole protrusion 22 are integrally stamped and formed.

[0048] The pole 2 , the first pole protrusion 21 and the second pole protrusion 22 are integrally formed, which facilitates the processing and manufacturing of the pole 2 and helps to further reduce the manufacturing cost of the battery cover 10 .

[0049] like Figure 5 As shown, the pole 2 includes a first end face 23 and a second end face 24 arranged opposite to each other along the thickness direction of the substrate 1 , the first pole protrusion 21 is arranged close to the first end face 23 , and the second pole protrusion 22 is arranged close to the second end face 24 .

[0050] Optionally, a surface of the first pole protrusion 21 away from the second pole protrusion 22 is flush with the first end surface 23 .

[0051] It is understandable that when the battery cover 10 is assembled with other components, one of the first end face 23 and the second end face 24 is electrically connected to the tab of the battery cell, and the other of the first end face 23 and the second end face 24 is electrically connected to the busbar.

[0052] By setting the surface of the first pole protrusion 21 away from the second pole protrusion 22 to be flush with the first end surface 23, the surface of the first pole protrusion 21 away from the second pole protrusion 22 can also be electrically connected to the pole lug or bus bar of the battery cell, thereby increasing the connection area between the pole 2 and the pole lug or bus bar of the battery cell. In this way, the connection reliability between the pole 2 and the pole lug or bus bar of the battery cell can be increased.

[0053] Optionally, a surface of the second pole protrusion 22 away from the first pole protrusion 21 is flush with the second end surface 24 .

[0054] By setting the surface of the second pole protrusion 22 away from the first pole protrusion 21 to be flush with the second end surface 24, the surface of the second pole protrusion 22 away from the first pole protrusion 21 can also be electrically connected to the pole lug or bus bar of the battery cell, thereby increasing the connection area between the pole 2 and the pole lug or bus bar of the battery cell. In this way, the connection reliability between the pole 2 and the pole lug or bus bar of the battery cell can be increased.

[0055] Alternatively, if Figure 1 and Figure 5 As shown, there are multiple first pole protrusions 21 , and the multiple first pole protrusions 21 are arranged at intervals along the circumferential direction of the pole 2 .

[0056] For example, Figure 1 and Figure 5 As shown, the number of the first pole protrusions 21 is two, and the two first pole protrusions 21 are arranged opposite to each other along the radial direction of the pole 2 .

[0057] By setting a plurality of first pole protrusions 21, the force bearing area between the substrate 1 and the first pole protrusions 21 can be increased, so that more load acts between the substrate 1 and the first pole protrusions 21, and less load acts on the injection molded part 3, which is beneficial to further reduce the shear force borne by the injection molded part 3 and further reduce the risk of sealing failure of the battery cover 10.

[0058] Optionally, there are multiple second pole protrusions 22 , and the multiple second pole protrusions 22 are arranged at intervals along the circumference of the pole 2 .

[0059] For example, Figure 1 and Figure 5 As shown, the number of the second pole protrusions 22 is two, and the two second pole protrusions 22 are arranged opposite to each other along the radial direction of the pole 2 .

[0060] By setting a plurality of second pole protrusions 22, the force bearing area between the substrate 1 and the second pole protrusions 22 can be increased, so that more load acts between the substrate 1 and the second pole protrusions 22, and less load acts on the injection molded part 3, which is beneficial to further reduce the shear force borne by the injection molded part 3 and further reduce the risk of sealing failure problems in the battery cover 10.

[0061] Optionally, the pole 2 , the first pole protrusion 21 and the second pole protrusion 22 are integrally formed and arranged in an axisymmetric or centrosymmetrical manner with respect to a center line of the pole hole 11 .

[0062] Alternatively, if Figure 3As shown, the injection molded part 3 includes an integrally formed sealing cylinder 31, a first injection molding protrusion 32 and a second injection molding protrusion 33, and the first injection molding protrusion 32 and the second injection molding protrusion 33 are respectively arranged at both ends of the sealing cylinder 31 in the thickness direction of the substrate 1. The sealing cylinder 31 is filled between the side of the pole 2 and the hole wall of the pole hole 11, and the substrate 1 is clamped between the first injection molding protrusion 32 and the second injection molding protrusion 33 in the thickness direction thereof.

[0063] By setting the injection molded part 3 to the above-mentioned structure and clamping the substrate 1 between the first injection molding protrusion 32 and the second injection molding protrusion 33 in the thickness direction, it is beneficial to increase the connection area between the injection molded part 3 and the substrate 1, improve the connection reliability between the injection molded part 3 and the substrate 1, and thus improve the reliability of the battery cover 10.

[0064] Optionally, at least one of the pole 2 , the first pole protrusion 21 and the second pole protrusion 22 is provided with a plurality of pole injection holes, and a portion of the injection molded part 3 is filled in the pole injection holes.

[0065] For example, the pole 2 , the first pole protrusion 21 and the second pole protrusion 22 are formed into a plurality of pole injection holes through an etching process.

[0066] By filling a portion of the injection molded part 3 in the pole injection hole, the connection reliability between the injection molded part 3 and the pole 2 and the sealing between the injection molded part 3 and the pole 2 can be increased, further improving the reliability of the battery cover 10.

[0067] Optionally, the substrate 1 is provided with a plurality of substrate injection holes, and a portion of the injection-molded part 3 is filled in the substrate injection holes.

[0068] For example, a plurality of substrate injection holes are formed on the substrate 1 through an etching process.

[0069] By filling a portion of the injection molded part 3 into the injection hole of the substrate, the connection reliability between the injection molded part 3 and the substrate 1 and the sealing between the injection molded part 3 and the substrate 1 can be increased, thereby further improving the reliability of the battery cover 10.

[0070] Optionally, a first gap is provided between the first pole protrusion 21 and the substrate 1 in the thickness direction of the substrate 1 , the first injection protrusion 32 is an annular protrusion, and at least a portion of the first injection protrusion 32 is filled in the first gap.

[0071] By filling at least a portion of the first injection molding protrusion 32 in the first gap, the first injection molding protrusion 32 is used to achieve sealing between the first pole protrusion 21 and the substrate 1, thereby increasing the sealing area between the pole 2 and the substrate 1, improving the sealing performance between the pole 2 and the substrate 1, and further reducing the risk of sealing failure problems in the battery cover 10.

[0072] Optionally, the first gap is greater than or equal to 0.3 mm and less than or equal to 0.6 mm. In other words, the first gap is S1, 0.3 mm≤S1≤0.6 mm.

[0073] Optionally, a second gap is provided between the second pole protrusion 22 and the substrate 1 in the thickness direction of the substrate 1 , the second injection protrusion 33 is an annular protrusion, and at least a portion of the second injection protrusion 33 is filled in the second gap.

[0074] By filling at least a portion of the second injection molding protrusion 33 in the second gap, the second injection molding protrusion 33 is used to achieve sealing between the second pole protrusion 23 and the substrate 1, thereby increasing the sealing area between the pole 2 and the substrate 1, improving the sealing performance between the pole 2 and the substrate 1, and further reducing the risk of sealing failure problems in the battery cover 10.

[0075] Optionally, the second gap is greater than or equal to 0.3 mm and less than or equal to 0.6 mm. In other words, the first gap is S2, 0.3 mm≤S2≤0.6 mm.

[0076] Optionally, the substrate 1 includes a thinned portion 13, the thickness of the thinned portion 13 is less than the thickness of the rest of the substrate 1, and the substrate 1 forms a groove 14 through the thinned portion 13. The pole hole 11 is provided in the thinned portion 13, and at least a portion of the first injection protrusion 32 and / or the second injection protrusion 33 is filled in the groove 14.

[0077] For example, grooves 14 are formed on both sides of the substrate 1 in the thickness direction, at least a portion of the first injection protrusion 32 is filled in one of the grooves 14 , and at least a portion of the second injection protrusion 33 is filled in the other groove 14 .

[0078] By providing the thinning portion 13 and filling at least a portion of the first injection molding protrusion 32 and / or the second injection molding protrusion 33 in the groove 14, it is beneficial to increase the connection area between the first injection molding protrusion 32 and / or the second injection molding protrusion 33 and the substrate 1, thereby further improving the connection reliability between the injection molded part 3 and the substrate 1.

[0079] Alternatively, if Figure 3 As shown, the thickness of the substrate 1 is T1, wherein 1 mm ≤ T1 ≤ 3 mm.

[0080] It is understandable that the smaller the thickness of the substrate 1, the lower the strength of the substrate 1, and the more likely it is to break and fail; the thicker the substrate 1, the higher the cost of the substrate 1, resulting in a higher cost of the battery cover 10. Experimental studies have shown that when the thickness of the substrate 1 is less than 1 mm, the substrate 1 is prone to breakage; when the thickness of the substrate 1 is greater than 3 mm, the cost of the substrate 1 increases significantly.

[0081] By setting the thickness of the substrate 1 to the above dimensions, the structural strength of the substrate 1 can be ensured while the cost of the substrate 1 is not too high. Thus, while ensuring the reliability of the battery cover 10 , it is beneficial to reduce the cost of the battery cover 10 .

[0082] Alternatively, if Figure 3 As shown, the thickness of the thinned portion 13 is T2, and 0.5T1<T2≤T1.

[0083] It is understandable that the smaller the thickness of the thinned portion 13, the lower the strength of the substrate 1, and the more likely it is to have fracture failure problems; the larger the thickness of the thinned portion 13, the smaller the depth of the groove 14, and the worse the connection reliability between the injection molded part 3 and the substrate 1. Experimental studies have shown that when the thickness of the thinned portion 13 is less than 0.5T1, the substrate 1 is prone to fracture problems.

[0084] By setting the thickness of the thinned portion 13 to the above dimensions, the cost of the substrate 1 can be kept low while ensuring the structural strength of the substrate 1 . This helps reduce the cost of the battery cover 10 while ensuring the reliability of the battery cover 10 .

[0085] Alternatively, if Figure 3 As shown, the thickness of the first pole protrusion 21 is T3, 0.5 mm≤T3≤1.5 mm.

[0086] It is understandable that the smaller the thickness of the first pole protrusion 21, the lower the strength of the first pole protrusion 21, and the more likely it is to cause fracture failure; the larger the thickness of the first pole protrusion 21, the higher the cost of the first pole protrusion 21, resulting in a higher cost of the battery cover 10.

[0087] By setting the thickness of the first pole protrusion 21 to the above size, the cost of the first pole protrusion 21 can be kept from being too high while ensuring the structural strength of the first pole protrusion 21. Therefore, while ensuring the reliability of the battery cover 10, it is beneficial to reduce the cost of the battery cover 10.

[0088] Alternatively, if Figure 3 As shown, the thickness of the second pole protrusion 22 is T4, 0.5 mm≤T4≤1.5 mm.

[0089] It is understandable that the smaller the thickness of the second pole protrusion 22, the lower the strength of the second pole protrusion 22, and the more likely it is to cause fracture failure; the larger the thickness of the second pole protrusion 22, the higher the cost of the second pole protrusion 22, resulting in a higher cost of the battery cover 10.

[0090] By setting the thickness of the second pole protrusion 22 to the above size, the cost of the second pole protrusion 22 can be kept from being too high while ensuring the structural strength of the second pole protrusion 22. Therefore, while ensuring the reliability of the battery cover 10, it is beneficial to reduce the cost of the battery cover 10.

[0091] Alternatively, if Figure 1 and Figure 7 As shown, there are multiple poles 2, some of which are positive poles, and the other poles 2 are negative poles. The number of positive poles is greater than or equal to 2, and the number of negative poles is greater than or equal to 2.

[0092] For example, Figure 7 As shown, there are four poles 2 , two of which are positive poles, and the other two poles 2 are negative poles.

[0093] By increasing the number of positive electrode posts and negative electrode posts, the current carrying capacity of the electrode 2 can be increased.

[0094] Optionally, the material of the positive electrode pole is aluminum alloy, and the material of the negative electrode pole is copper or a copper-aluminum composite material.

[0095] Reference below Figure 6 Describe the assembly process of the battery cover 10 of the embodiment of the utility model:

[0096] As shown in FIG. a, the pole 2 is aligned with the pole hole 11, and the second pole protrusion 22 is aligned with the avoidance groove 12; as shown in FIG. b, the pole 2 is passed through the pole hole 11, and one of the first pole protrusion 21 and the second pole protrusion 22 is passed through the avoidance groove 12; as shown in FIG. c, the pole 2 is rotated so that the first pole protrusion 21 and the second pole protrusion 22 are staggered with the avoidance groove 12 in the circumferential direction, and the relative position of the pole 2 in the thickness direction of the substrate 1 is adjusted to fix the pole 2 and the substrate 1; as shown in FIG. d, plastic is injected between the substrate 1 and the pole 2, and an injection molded part 3 is formed after the plastic solidifies, and the injection molded part 3 is used to achieve sealing and connection between the substrate 1 and the pole 2. Among them, a positioning hole can be set at the bottom of the pole 2 to position the pole 2; the injection molded part 3 is injection molded by a nano injection molding process.

[0097] The battery cover 10 of the embodiment of the utility model improves the structural strength and reliability of the battery cover 10 by arranging the first pole protrusion 21 and the second pole protrusion 22 on the pole 2; the sealing ring structure is eliminated, which not only reduces the overall cost of the battery cover 10, but also allows the cross-sectional area of ​​the pole 2 to be set larger, thereby improving the current carrying capacity of the pole 2.

[0098] like Figure 8As shown, the single battery 100 of the embodiment of the utility model includes a shell 20, a battery cell and a battery cover 10, and the battery cover 10 is the battery cover 10 described in any of the above embodiments. The shell 20 has an opening, and the substrate 1 is connected to the shell 20 and blocks the opening. The battery cell has a pole ear, and the pole column 2 is electrically connected to the pole ear. Among them, the pole column 2 and the pole ear can be welded.

[0099] Since the risk of sealing failure of the battery cover 10 is relatively low, the reliability of the single battery 100 in the embodiment of the utility model is relatively good.

[0100] Optionally, the substrate 1 is provided with a pressure relief hole 15 penetrating along the thickness direction thereof, and an explosion-proof valve 4 is provided in the pressure relief hole 15 .

[0101] When thermal runaway occurs in the single cell 100 , the explosion-proof valve 4 opens to release the gas inside the single cell 100 , thereby preventing the single cell 100 from exploding and ensuring the safety of the single cell 100 .

[0102] The battery pack of the embodiment of the utility model comprises a box body and a plurality of single cells 100, wherein the plurality of single cells 100 are arranged in the box body, and at least one single cell 100 is a single cell 100 described in any of the above embodiments. Among them, the plurality of single cells 100 in the box body may be partially a single cell 100 described in any of the above embodiments, and the other partially a single cell in the prior art; or all of them may be the single cells 100 described in any of the above embodiments.

[0103] Since the single battery 100 of the embodiment of the present invention has better reliability, the battery pack of the embodiment of the present invention has better reliability.

[0104] The vehicle of the embodiment of the utility model includes the single battery described in any of the above embodiments and / or the battery pack described in any of the above embodiments.

[0105] Since the single cell 100 and the battery pack according to the embodiment of the utility model have good reliability, the vehicle according to the embodiment of the utility model has advantages such as good reliability.

[0106] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are illustrative and cannot be construed as limitations on the present invention. Changes, modifications, substitutions and variations of the above embodiments by those of ordinary skill in the art are all within the scope of protection of the present invention.

Claims

1. A battery cover, characterized in that: include: A substrate, wherein the substrate is provided with a pole hole penetrating along a thickness direction thereof; A pole, wherein a first pole protrusion and a second pole protrusion are provided on a side of the pole, the first pole protrusion and the second pole protrusion are arranged at intervals along the thickness direction of the substrate, the pole is inserted into the pole hole, and the first pole protrusion and the second pole protrusion are respectively stopped at two sides of the thickness direction of the substrate; The injection molded part at least part of which is filled between the side surface of the pole and the hole wall of the pole hole.

2. The battery cover according to claim 1, characterized in that: The hole wall of the pole hole is provided with an avoidance groove penetrating along the thickness direction of the substrate, and the avoidance groove is used for the first pole protrusion and / or the second pole protrusion to pass through.

3. The battery cover according to claim 2, characterized in that: The first pole protrusion and the second pole protrusion have the same shape, and the first pole protrusion and the second pole protrusion have the same size.

4. The battery cover according to claim 1, characterized in that: The projection of the first pole protrusion on a preset plane and the projection of the second pole protrusion on the preset plane are staggered, wherein the preset plane is perpendicular to the thickness direction of the substrate; and / or The pole includes a first end face and a second end face arranged opposite to each other along the thickness direction of the substrate, the first pole protrusion is arranged close to the first end face, and the second pole protrusion is arranged close to the second end face; the surface of the first pole protrusion away from the second pole protrusion is flush with the first end face, and / or the surface of the second pole protrusion away from the first pole protrusion is flush with the second end face.

5. The battery cover according to any one of claims 1 to 4, characterized in that: The injection molded part includes an integrally formed sealing cylinder, a first injection molding protrusion and a second injection molding protrusion. The sealing cylinder is filled between the side surface of the pole and the hole wall of the pole hole. The first injection molding protrusion and the second injection molding protrusion are respectively arranged at both ends of the sealing cylinder in the thickness direction of the substrate. The substrate is clamped between the first injection molding protrusion and the second injection molding protrusion in its thickness direction.

6. The battery cover according to claim 5, characterized in that: A first gap is provided between the first pole protrusion and the substrate in the thickness direction of the substrate, the first injection molding protrusion is an annular protrusion, and at least a portion of the first injection molding protrusion is filled in the first gap; and / or A second gap is provided between the second pole protrusion and the substrate in the thickness direction of the substrate. The second injection protrusion is an annular protrusion. At least a portion of the second injection protrusion is filled in the second gap.

7. The battery cover according to claim 5, characterized in that: The substrate comprises a thinned portion, the thickness of the thinned portion is smaller than the thickness of the remaining portion of the substrate, and the substrate forms a groove through the thinned portion; The pole hole is provided in the thinned portion, and at least a portion of the first injection molding protrusion and / or the second injection molding protrusion is filled in the groove.

8. A single battery, characterized in that: include: a housing having an opening; A battery cell, wherein the battery cell has a tab; A battery cover, wherein the battery cover is the battery cover according to any one of claims 1 to 7, wherein the substrate is connected to the shell and blocks the opening, and the pole is electrically connected to the pole ear.

9. A battery pack, characterized in that: include: Box; A plurality of single cells, each of which is disposed in the housing, and at least one of which is the single cell according to claim 8.

10. A vehicle, characterized in that: Includes the single battery as claimed in claim 8 and / or the battery pack as claimed in claim 9.

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