Pole, battery cover plate assembly, battery and electric equipment

Abstract

The utility model relates to a post terminal, a battery cover plate assembly, a battery and electric equipment, the post terminal comprises a post terminal body, the post terminal body is provided with a liquid injection part and a bulge formed on the liquid injection part, the bulge extends along a first direction, and a through hole penetrating through the bulge along the first direction is formed in the bulge; a liquid injection hole penetrating through the liquid injection part in the first direction is formed in the liquid injection part, the through hole communicates with the liquid injection hole, and at least part of the hole wall of the liquid injection hole and at least part of the hole wall of the through hole are used for making sealed contact with the peripheral face of the hole plugging piece. According to the technical scheme, the protrusion is arranged on the liquid injection part and extends in the first direction, the through hole penetrating through the protrusion in the first direction is formed in the protrusion, and the through hole is communicated with the liquid injection hole, so that when the plugging piece is inserted into the liquid injection hole, the liquid injection hole is not blocked; the peripheral surface of the plugging piece can be in sealing contact with at least part of the hole wall of the liquid injection hole and at least part of the hole wall of the through hole at the same time, so that the sealing length and the contact area between the plugging piece and the pole column are increased, and the sealing effect on the liquid injection hole is improved.

Description

Technical Field

[0001] The present disclosure relates to the field of battery technology, and in particular to a pole, a battery cover assembly, a battery, and an electrical device. Background Art

[0002] The pole is an important component of the battery. During the battery production process, electrolyte is injected into the battery casing through the injection hole on the pole. After the injection is completed, the sealing piece is sealed in the injection hole to achieve sealing of the injection hole.

[0003] However, due to the limitation of the length of the injection hole, when the sealing member is sealed in the injection hole, the contact area between the outer peripheral surface of the sealing member and the hole wall of the injection hole is limited, that is, the sealing distance of the sealing member is too short, which will affect the performance of the battery. Utility Model Content

[0004] The purpose of the present disclosure is to provide a pole, a battery cover assembly, a battery and an electrical device to solve the technical problems existing in the related art.

[0005] In order to achieve the above-mentioned purpose, the first aspect of the present disclosure provides a pole, including a pole body, the pole body having a liquid injection portion and a protrusion formed on the liquid injection portion, the protrusion extending along a first direction, the protrusion being provided with a through hole penetrating itself along the first direction, the liquid injection portion being provided with an injection hole penetrating the liquid injection portion along the first direction, the through hole being connected to the liquid injection hole, and the hole wall of the liquid injection hole and at least a part of the hole wall of the through hole are used for sealing contact with the outer peripheral surface of the hole blocking member.

[0006] Optionally, the liquid injection portion has a first surface and a second surface opposite to each other, the first surface is used to be connected to a current collecting plate on the battery cell, and the protrusion is formed on the second surface.

[0007] Optionally, the diameter of the inner circumferential surface of at least part of the protrusion is the same as the hole diameter of the injection hole.

[0008] Optionally, the inner circumferential surface of the protrusion includes an annular guide surface, and the diameter of the annular guide surface gradually increases along the direction from the end of the protrusion close to the liquid injection part to the end of the protrusion away from the liquid injection part.

[0009] Optionally, a first groove is formed on the pole body, the liquid injection portion is the bottom wall of the first groove, the first groove is used to accommodate the hole blocking member, and along the direction from the bottom wall of the first groove to the notch of the first groove, the cross-sectional area of ​​the surface of the first groove perpendicular to the first direction gradually increases.

[0010] Optionally, an angle between a side wall of the first groove and the first direction is less than or equal to 15°.

[0011] Optionally, a second groove is also formed on the pole body, the bottom of the second groove is connected to the notch of the first groove, the second groove is used to accommodate a sealing cover so that the sealing cover can cover the notch of the first groove, and the depth of the second groove in the first direction is set to be greater than the thickness of the sealing cover in the first direction.

[0012] Optionally, the second groove includes a first groove portion and a second groove portion that are interconnected, the first groove portion is located between the second groove portion and the first groove, the first groove portion is used to accommodate the sealing cover, and the cross-sectional area of ​​the second groove portion in a surface perpendicular to the first direction is larger than the cross-sectional area of ​​the first groove portion in a surface perpendicular to the first direction.

[0013] Optionally, along a direction from the first groove to the second groove portion, a cross-sectional area of ​​the first groove portion on a surface perpendicular to the first direction gradually increases.

[0014] Optionally, a difference between a depth of the second groove in the first direction and a thickness of the blocking cover in the first direction is greater than or equal to 0.05 mm.

[0015] Optionally, a ratio of a thickness of the protrusion in the first direction to a thickness of the liquid injection portion in the first direction is less than or equal to 2.

[0016] Optionally, the thickness of the protrusion in the first direction is less than or equal to 3 mm.

[0017] A second aspect of the present disclosure provides a battery cover assembly, comprising a cover body and the pole as described above, wherein a mounting hole is formed on the cover body, and the pole is mounted in the mounting hole.

[0018] Optionally, a first flange is formed on the pole body of the pole, and the first flange is used to be arranged on a side of the cover body close to the battery cell. A receiving groove is formed on the cover body, and at least part of the first flange is located in the receiving groove.

[0019] A third aspect of the present disclosure provides a battery, comprising the electrode or battery cover assembly as described above.

[0020] A fourth aspect of the present disclosure provides an electrical device comprising the battery as described above.

[0021] Through the above technical solution, a protrusion is provided on the injection part, the protrusion extends along the first direction and forms a through hole penetrating itself along the first direction, and the through hole is connected with the injection hole. In this way, when the sealing member is inserted into the through hole and the injection hole, the outer peripheral surface of the sealing member can simultaneously be in sealing contact with the hole wall of the injection hole and at least part of the hole wall of the through hole, thereby increasing the sealing length and contact area between the sealing member and the pole, and improving the sealing effect of the injection hole.

[0022] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings:

[0024] Figure 1 is a cross-sectional schematic diagram of a pole provided by an exemplary embodiment of the present disclosure;

[0025] Figure 2 is a cross-sectional schematic diagram of a battery cover assembly and a battery cell provided in an exemplary embodiment of the present disclosure;

[0026] Figure 3 yes Figure 2 An enlarged schematic diagram of part A.

[0027] Description of Reference Numerals

[0028] 1-pole; 10-pole body; 11-liquid injection part; 110-liquid injection hole; 12-protrusion; 120-annular guide surface; 121-through hole; 13-first groove; 14-second groove; 140-first groove part; 141-second groove part; 15-first flange; 16-second flange; 2-sealing member; 21-large diameter section; 22-small diameter section; 3-collecting plate; 4-sealing cover; 5-cover body; 51-accommodating groove; 6-upper insulating spacer; 7-lower insulating spacer; 8-sealing ring. DETAILED DESCRIPTION

[0029] The specific implementation of the present disclosure is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described herein is only used to illustrate and explain the present disclosure, and is not used to limit the present disclosure.

[0030] In the present disclosure, unless otherwise stated, the directions or positional relationships indicated by the directional words such as “first direction” are based on the attached Figure 1The directions of the drawings shown are defined herein, and the directional words used are only for the convenience of describing the present disclosure and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, and a specific orientation structure and operation, and therefore cannot be understood as a limitation of the present disclosure. The terms "inside and outside" refer to the inside and outside of the corresponding structural contour.

[0031] It should be noted that the terms used, such as "first", "second", etc., are used to distinguish one element from another element, and do not have order or importance. In addition, in the description with reference to the drawings, the same reference numerals in different drawings represent the same elements.

[0032] In the description of the present disclosure, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "connect", "connected", and "installed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present disclosure can be understood according to specific circumstances.

[0033] refer to Figures 1 to 3 As shown, the first aspect of the present disclosure provides a pole, including a pole body 10, the pole body 10 has a liquid injection portion 11 and a protrusion 12 formed on the liquid injection portion 11, the protrusion 12 extends along a first direction, and the protrusion 12 is provided with a through hole 121 penetrating itself along the first direction, and the liquid injection portion 11 is provided with a liquid injection hole 110 penetrating the liquid injection portion 11 along the first direction, the through hole 121 is connected to the liquid injection hole 110, and the hole wall of the liquid injection hole 110 and at least part of the hole wall of the through hole 121 are used for sealing contact with the outer peripheral surface of the hole blocking member.

[0034] Through the above technical solution, by arranging a protrusion 12 on the injection part 11, the protrusion 12 extends along the first direction and forms a through hole 121 penetrating itself along the first direction, and the through hole 121 is connected with the injection hole 110. In this way, when the sealing member 2 is inserted into the through hole 121 and the injection hole 110, the outer peripheral surface of the sealing member 2 can be in sealing contact with the hole wall of the injection hole 110 and at least part of the hole wall of the through hole 121 at the same time, thereby increasing the sealing length and contact area between the sealing member 2 and the pole 1, and improving the sealing effect of the injection hole 110.

[0035] Here, it should be noted that the present disclosure does not limit the specific position where the protrusion 12 is formed on the liquid injection portion 11. For example, in an exemplary embodiment provided in the present disclosure, Figure 2 , Figure 3As shown, the injection part 11 has a first surface and a second surface relative to each other, the first surface is used to connect with the current collecting plate 3 on the battery cell, and the protrusion 12 can be formed on the second surface. In this way, on the one hand, when the plugging member 2 is inserted into the injection hole 110, the inner peripheral surface of the protrusion 12 formed on the second surface and at least part of the hole wall of the injection hole 110 can be sealed and contacted with the outer peripheral surface of the plugging member 2, so as to achieve the purpose of improving the sealing effect; on the other hand, it is precisely because the protrusion 12 is formed on the second surface that in the process of welding the injection part 11 to the current collecting plate 3 of the battery by penetration welding, the protrusion 12 can stop and block the welding slag generated in the above-mentioned penetration welding process, thereby avoiding or reducing the situation where the welding slag falls onto the pole core through the injection hole 110.

[0036] Alternatively, in another embodiment provided in the present disclosure, the liquid injection portion 11 has a first surface and a second surface relative to each other, the first surface is used to connect with the collecting plate 3 on the battery cell, and the protrusion 12 can be formed on the first surface. Similarly, the protrusion 12 formed on the first surface can also increase the sealing length and sealing area between the sealing member 2 and the pole 1, and will not cause interference or interference to the assembly of the sealing member 2.

[0037] In addition, the present disclosure does not limit the specific shape of the protrusion. For example, the protrusion can be formed in a circular ring shape or a rectangular ring shape.

[0038] Optionally, in order to further improve the sealing effect of the plugging member 2 on the injection hole 110, in the present disclosure, the diameter of the inner circumference of at least part of the protrusion 12 is the same as the aperture of the injection hole 110. After the plugging member 2 is inserted into the injection hole 110, the outer circumference of the plugging member 2 can be in sealing contact with at least part of the hole wall of the injection hole 110 and part of the inner circumference of the protrusion 12 having the same aperture as the injection hole 110, and there is no need to adjust the size and shape of the plugging member 2, which can reduce the difficulty and cost of processing the plugging member 2.

[0039] Of course, the diameter of the inner circumference of the protrusion 12 may be larger than the aperture of the injection hole 110. In order to ensure the sealing contact between the sealing member 2 and the pole 1, the shape of the outer circumference of the sealing member 2 inserted in the protrusion 12 may be set to match the shape and size of the inner circumference of the protrusion 12 to form an effective seal between the sealing member 2 and the protrusion 12.

[0040] In order to facilitate the assembly of the blocking member 2, in an exemplary embodiment provided in the present disclosure, as shown in FIG. Figure 1 , Figure 3As shown, optionally, the inner circumferential surface of the protrusion 12 includes an annular guide surface 120, and the diameter of the annular guide surface 120 gradually increases along the direction from the end of the protrusion 12 close to the liquid injection part 11 to the end of the protrusion 12 away from the liquid injection part 11. The diameter of the annular guide surface 120 gradually increases along the direction from the end of the protrusion 12 close to the liquid injection part 11 to the end of the protrusion 12 away from the liquid injection part 11, that is, it can be understood that the annular guide surface 120 is flared, and the annular guide surface 120 has a larger opening, so it is more convenient to insert the plugging member 2 into the inside of the protrusion 12 and the liquid injection hole 110, and in the process of inserting the plugging member 2 (the plugging member 2 moves from the end of the protrusion 12 away from the liquid injection part 11 to the end of the protrusion 12 close to the liquid injection part 11), the annular guide surface 120 with a gradually decreasing diameter can also play a guiding role in the insertion of the plugging member 2, avoiding the plugging member 2 and the protrusion 12 from conflicting or interfering.

[0041] Alternatively, in another embodiment provided by the present disclosure, the shape of the blocking member 2 may be modified to facilitate the insertion operation of the blocking member 2 by the operator, for example, Figure 2 , Figure 3 As shown, the diameter of the blocking member 2 gradually decreases in the direction approaching the battery cell, so that the blocking member 2 with a smaller diameter can be easily inserted into the protrusion 12 and the injection hole 110.

[0042] Alternatively, if Figures 1 to 3 As shown, a first groove 13 may be formed on the pole body 10, and the liquid injection portion 11 is the bottom wall of the first groove 13. The first groove 13 is used to accommodate the hole plugging member. Along the direction from the bottom wall of the first groove 13 to the notch of the first groove 13, the cross-sectional area of ​​the surface of the first groove 13 perpendicular to the first direction gradually increases. Since the liquid injection portion 11 is the bottom wall of the first groove 13, after the plugging member 2 is inserted into the liquid injection hole 110 on the liquid injection portion 11, the plugging member 2 is also located in the first groove 13, so that the plugging member 2 can be less disturbed by the outside world and the stability of the matching between the plugging member 2 and the pole 1 can be improved.

[0043] In addition, since the cross-sectional area of ​​the surface of the first groove 13 perpendicular to the first direction gradually increases along the direction from the bottom wall of the first groove 13 to the notch of the first groove 13, that is, a draft angle is formed between the side wall of the first groove 13 and the first direction of the first groove 13, it is more convenient to use cold heading process to process and form the above-mentioned pole 1.

[0044] In an exemplary embodiment provided by the present disclosure, optionally, the angle between the side wall of the first groove 13 and the first direction is less than or equal to 15°. At this angle, it is convenient to cold-head the pole 1 and to accommodate the blocking member 2.

[0045] In order to further improve the sealing effect of the injection hole 110, in the present disclosure, optionally, as Figures 1 to 3 As shown, a second groove 14 may also be formed on the pole body 10, the bottom of the second groove 14 is connected to the notch of the first groove 13, the second groove 14 is used to accommodate the plugging cover 4, so that the plugging cover 4 can cover the notch of the first groove 13, and the depth of the second groove 14 in the first direction is set to be greater than the thickness of the plugging cover 4 in the first direction. In this way, after the plugging member 2 is inserted into the injection hole 110, the plugging cover 4 can be sealed in the second groove 14 and cover the notch of the first groove 13, so as to achieve secondary sealing of the injection hole 110, and the side of the plugging plate close to the plugging member 2 can also be abutted against the end of the plugging member 2 close to the plugging plate to prevent the plugging member 2 from falling out of the injection hole 110.

[0046] Furthermore, since the depth of the second groove 14 in the first direction is greater than the thickness of the cover in the first direction, after the cover is placed in the second groove 14, the upper surface of the cover is lower than the upper surface of the second groove 14. When the cover plate is welded to the inner circumference of the first groove 13 by welding, the weld bead after welding can be accommodated in the second groove 14, that is, the weld bead will not protrude from the second groove 14 and will not occupy the height space of the battery.

[0047] In the present disclosure, the sealing member 2 mentioned above may be a sealing nail made of rubber, and the sealing nail may include a large diameter section 21 and a small diameter section 22 connected to each other, such as Figure 2 , Figure 3 As shown, the small diameter section 22 is used to be inserted into the protrusion 12 and the injection hole 110, the large diameter section 21 is used to be accommodated in the first groove 13, and the end of the large diameter section 21 away from the small diameter section 22 is used to abut against the sealing cover 4 to enhance the sealing effect and stability of the sealing nail.

[0048] Alternatively, if Figures 1 to 3 As shown, the second groove 14 includes a first groove portion 140 and a second groove portion 141 which are interconnected. The first groove portion 140 is located between the second groove portion 141 and the first groove 13. The first groove portion 140 is used to accommodate the blocking cover 4. The cross-sectional area of ​​the second groove portion 141 on the surface perpendicular to the first direction is greater than the cross-sectional area of ​​the first groove portion 140 on the surface perpendicular to the first direction. The cross-sectional area of ​​the second groove portion 141 on the surface perpendicular to the first direction is greater than the cross-sectional area of ​​the first groove portion 140 on the surface perpendicular to the first direction. After the blocking cover 4 is placed in the first groove portion 140, the inner circumference of the second groove portion 141 can be prevented from interfering with the welding between the blocking cover 4 and the first groove portion 140, providing a welding space for welding between the edge of the blocking cover 4 and the first groove portion 140, making it easier to weld the blocking cover 4.

[0049] Alternatively, if Figures 1 to 3 As shown, along the direction from the first groove 13 to the second groove 141, the cross-sectional area of ​​the first groove 140 on the surface perpendicular to the first direction gradually increases. In this way, after the blocking cover 4 is placed in the first groove 140, the blocking cover 4 has a tendency to move downward in the first groove 140, so that the blocking cover 4 can be closely attached to the inner circumferential surface of the first groove 140 under the action of its own gravity, and has better stability. In addition, the cross-sectional area of ​​the first groove 140 on the surface perpendicular to the first direction gradually increases along the direction from the first groove 13 to the second groove 141, which also makes it easier to perform cold heading operations on the first groove 140.

[0050] In an exemplary embodiment provided by the present disclosure, optionally, the difference between the depth of the second groove 14 in the first direction and the thickness of the blocking cover 4 in the first direction is greater than or equal to 0.05 mm. The height of the weld bead is generally less than 0.05 mm, so setting the depth of the second groove 14 in the first direction to be greater than or equal to 0.05 mm from the thickness of the blocking cover 4 in the first direction can ensure that the weld bead can be completely accommodated in the second groove 14 after the welding of the cover plate is completed.

[0051] Optionally, the ratio of the thickness of the protrusion 12 in the first direction to the thickness of the liquid injection portion 11 in the first direction is less than or equal to 2. Within this range, the cold heading operation of the pole 1 is more convenient.

[0052] Optionally, in an exemplary embodiment provided in the present disclosure, the thickness of the protrusion 12 in the first direction is less than or equal to 3 mm. In this way, the effective sealing length between the plugging member 2 and the pole 1 can be increased, and the modification of the structure of the pole 1 and the plugging member 2 can be reduced, thereby reducing the modification and processing costs.

[0053] The second aspect of the present disclosure provides a battery cover assembly, comprising a cover body 5 and the above-mentioned pole 1, wherein a mounting hole is formed on the cover body 5, and the pole 1 is mounted in the mounting hole. The battery cover assembly has all the beneficial effects of the above-mentioned pole 1.

[0054] In order to facilitate the fixing of the pole 1, optionally, as Figure 2 , Figure 3As shown, a first flange 15 may be formed on the pole body 10 of the pole 1. The first flange 15 is used to be arranged on the side of the cover body 5 close to the battery cell. A receiving groove 51 is formed on the cover body 5, and at least part of the first flange 15 is located in the receiving groove 51. In this way, after the pole 1 is installed in the mounting hole, the cover body 5 can be pressed on the first flange 15, so as to fix the pole 1. Moreover, because the receiving groove 51 is also formed on the cover body 5, when the cover body 5 is pressed on the first flange 15, the first flange 15 can be at least partially embedded in the receiving groove 51. On the one hand, the contact area between the cover body 5 and the first flange 15 can be increased, so that the cooperation between the first flange 15 and the cover body 5 is more stable, and the pressing effect of the first flange 15 is improved. On the other hand, the first flange 15 is accommodated in the receiving groove 51 of the cover body 5, which can reduce the occupation of the flange in the internal space of the battery.

[0055] In order to further improve the stability between the cover body 5 and the pole 1, as Figures 1 to 3 As shown, in an exemplary embodiment provided by the present disclosure, a second flange 16 can also be formed on the pole body 10, and the second flange 16 can be set on the side of the cover body 5 away from the battery cell. In this way, when the pole 1 is installed in the mounting hole, the first flange 15 and the second flange 16 can respectively clamp and fix the cover body 5 from both sides of the cover body 5 to limit the movement of the pole 1 in the mounting hole.

[0056] In addition, if Figure 2 , Figure 3 As shown, a sealing ring 8 and an upper insulating spacer 6 are further provided between the second flange 16 and the side of the cover body 5 away from the battery cell, and a lower insulating spacer 7 is provided between the first flange 15 and the side of the cover body 5 close to the battery cell. The upper insulating spacer 6 and the lower insulating spacer 7 can insulate the cover body 5 from the first flange 15 and the second flange 16, and the sealing ring 8 can seal the second flange 16 and the cover body 5, thereby improving the sealing between the pole 1 and the cover body 5.

[0057] The third aspect of the present disclosure provides a battery, comprising the above-mentioned pole 1 or battery cover assembly. The battery has all the beneficial effects of the above-mentioned pole 1 and battery cover assembly.

[0058] The fourth aspect of the present disclosure provides an electric device, comprising the above battery. The electric device has all the beneficial effects of the above battery. The electric device can be any device with power demand, such as a vehicle, an energy storage cabinet, an aircraft, etc., and the present disclosure does not make any specific restrictions on this.

[0059] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings; however, the present disclosure is not limited to the specific details in the above embodiments. Within the technical concept of the present disclosure, a variety of simple modifications can be made to the technical solution of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

[0060] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0061] In addition, various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims

1. A pole, characterized in that: The invention comprises a pole body, wherein the pole body has a liquid injection portion and a protrusion formed on the liquid injection portion, wherein the protrusion extends along a first direction, and the protrusion is provided with a through hole penetrating the protrusion along the first direction, and the liquid injection portion is provided with a liquid injection hole penetrating the liquid injection portion along the first direction, and the through hole is connected with the liquid injection hole, and the hole wall of the liquid injection hole and at least a part of the hole wall of the through hole are used for sealing contact with the outer peripheral surface of the hole blocking member.

2. The pole according to claim 1, characterized in that: The liquid injection portion has a first surface and a second surface that are opposite to each other, the first surface is used to be connected to a current collecting plate on the battery cell, and the protrusion is formed on the second surface.

3. The pole according to claim 1, characterized in that: The diameter of the inner circumferential surface of at least part of the protrusion is the same as the hole diameter of the injection hole.

4. The pole according to claim 1, characterized in that: The inner circumferential surface of the protrusion includes an annular guide surface, and the diameter of the annular guide surface gradually increases along the direction from the end of the protrusion close to the liquid injection part to the end of the protrusion away from the liquid injection part.

5. The pole according to claim 1, characterized in that: A first groove is formed on the pole body, the liquid injection portion is the bottom wall of the first groove, the first groove is used to accommodate the hole blocking member, and along the direction from the bottom wall of the first groove to the notch of the first groove, the cross-sectional area of ​​the surface of the first groove perpendicular to the first direction gradually increases.

6. The pole according to claim 5, characterized in that: An angle between a side wall of the first groove and the first direction is less than or equal to 15°.

7. The pole according to claim 5, characterized in that: A second groove is also formed on the pole body, the bottom of the second groove is connected to the notch of the first groove, the second groove is used to accommodate a sealing cover so that the sealing cover can cover the notch of the first groove, and the depth of the second groove in the first direction is set to be greater than the thickness of the sealing cover in the first direction.

8. The pole according to claim 7, characterized in that: The second groove includes a first groove portion and a second groove portion which are connected to each other, the first groove portion is located between the second groove portion and the first groove, the first groove portion is used to accommodate the sealing cover, and the cross-sectional area of ​​the second groove portion on a surface perpendicular to the first direction is greater than the cross-sectional area of ​​the first groove portion on a surface perpendicular to the first direction.

9. The pole according to claim 8, characterized in that: Along the direction from the first groove to the second groove portion, the cross-sectional area of ​​the first groove portion on a surface perpendicular to the first direction gradually increases.

10. The pole according to any one of claims 7 to 9, characterized in that: A difference between a depth of the second groove in the first direction and a thickness of the blocking cover in the first direction is greater than or equal to 0.05 mm.

11. The pole according to any one of claims 1 to 9, characterized in that: A ratio of a thickness of the protrusion in the first direction to a thickness of the liquid injection portion in the first direction is less than or equal to 2.

12. The pole according to claim 3, characterized in that: The thickness of the protrusion in the first direction is less than or equal to 3 mm.

13. A battery cover assembly, characterized in that: It comprises a cover plate body and a pole according to any one of claims 1 to 12, wherein a mounting hole is formed on the cover plate body, and the pole is mounted in the mounting hole.

14. The battery cover assembly according to claim 13, characterized in that: A first flange is formed on the pole body of the pole, and the first flange is used to be arranged on a side of the cover body close to the battery cell. A receiving groove is formed on the cover body, and at least part of the first flange is located in the receiving groove.

15. A battery, characterized in that: It comprises the pole described in any one of claims 1 to 12 or the battery cover assembly described in any one of claims 13 to 14.

16. An electrical equipment, characterized in that: Comprising the battery of claim 15.

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