CN217306615U - Cover plate, battery cover plate assembly and power battery - Google Patents

Abstract

The application provides a apron, battery cover plate subassembly and power battery. Be equipped with the utmost point post through-hole that is used for passing utmost point post on the apron, the surface of apron is provided with protruding group, and protruding group is including a plurality of archs that set up around utmost point post through-hole interval. The battery cover plate assembly comprises the cover plate, and the power battery comprises the battery cover plate assembly. This application sets up a plurality of archs through the surface at the apron around utmost point post through-hole interval to wear to locate utmost point post through-hole and with the apron fixed back of rubber coating of moulding plastics as utmost point post, can increase the relative rotation resistance of utmost point post, make whole utmost point post have better preventing turning round the performance, also make the leakproofness of battery cover plate subassembly better simultaneously.

Description

Cover plate, battery cover plate assembly and power battery

Technical Field

The application belongs to the technical field of batteries, especially relates to a apron, battery cover plate subassembly and power battery.

Background

With the development of the times, the power battery with the characteristics of energy conservation and environmental protection is gradually popularized and applied in the field of new energy. In the battery cover plate component of the existing power battery, a pole through hole is formed in a cover plate, a pole penetrates through the pole through hole, the effectiveness of pole torsion is realized by changing the structure of the pole, but the pole is fixed on the cover plate in a welding mode, so that the torsion resistance of the pole is poor. Accordingly, there is a need for an improved structure of the existing battery cover plate assembly.

SUMMERY OF THE UTILITY MODEL

The embodiment of the application provides a apron, battery cover plate subassembly and power battery to solve the current not good problem of turning round performance of utmost point post of battery cover plate subassembly.

In a first aspect, an embodiment of the present application provides an apron, be equipped with the utmost point post through-hole that is used for passing utmost point post on the apron, the surface of apron is provided with protruding group, protruding group is including centering on a plurality of archs that utmost point post through-hole interval set up.

Optionally, the protrusions are uniformly arranged on the surface of the cover plate around the pole through holes at intervals.

Optionally, a groove set is further disposed on the cover plate, the groove set includes a plurality of grooves disposed at intervals around the pole through hole, one of the groove set and the protrusion set is disposed on the front surface of the cover plate, and the other is disposed on the back surface of the cover plate.

Optionally, the plurality of protrusions and the plurality of grooves correspond one to one.

Optionally, the cover plate is a straight plate; or the cover plate comprises a first plate and two second plates which are respectively connected to two ends of the first plate in the length direction, the two second plates are both vertical to the first plate, and the second plate and/or the first plate are/is provided with the pole through holes and the protrusion groups; or the cover plate is an annular rectangular frame body with an opening on one surface; or the cover plate comprises a top plate, two ends of the top plate are bent to form a first end plate and a second end plate which are opposite, and the top plate, the first end plate and/or the second end plate are/is provided with the pole through holes and the protrusion sets; or the cover plate comprises three plate bodies which are spliced to form a U-shaped structure.

In a second aspect, an embodiment of the present application provides a battery cover plate assembly, which includes a post, a rubber-coated member, and the cover plate described in any one of the above items, where the post penetrates through the post through hole of the cover plate, and the rubber-coated member is disposed in a gap between the post and the cover plate, a gap between two adjacent protrusions, and the periphery of the protrusion.

Optionally, an anti-rotation groove is formed in the surface of the pole, which is in contact with the rubber-coated part; and/or the pole comprises a first pole part and a second pole part connected with the first pole part, the cross-sectional area of the second pole part is larger than that of the first pole part, the first pole part penetrates through the pole through hole, and the second pole part is positioned on the back side of the cover plate and has a gap with the back side of the cover plate.

In a third aspect, an embodiment of the present application further provides a power battery, where the power battery includes a battery cover plate assembly as described in any one of the above.

Optionally, the power battery further includes a battery cell and a casing having an opening, the battery cell is disposed in the casing, the opening of the casing is matched with the cover plate, and the cover plate is hermetically connected to the opening of the casing.

Optionally, a step is arranged on the edge of the back of the cover plate along the circumferential direction of the cover plate, and the edge of the shell abuts against the surface of the step and is welded to the cover plate.

The utility model provides a apron, battery cover plate subassembly and power battery set up a plurality of archs through the surface at the apron around utmost point post through-hole interval to wear to locate utmost point post through-hole and with the apron fixed back of moulding plastics the rubber coating when utmost point post, can increase the relative rotation resistance of utmost point post, make whole utmost point post have better preventing turning round the performance, also make battery cover plate subassembly's leakproofness better simultaneously.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings used in the description of the embodiments will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the application, and that other drawings can be derived from these drawings by a person skilled in the art without inventive effort.

For a more complete understanding of the present application and its advantages, reference is now made to the following descriptions taken in conjunction with the accompanying drawings. Wherein like reference numerals refer to like parts in the following description.

Fig. 1 is a schematic structural diagram of a cover plate according to an embodiment of the present application.

Fig. 2 is a schematic structural diagram of another view angle of the cover plate shown in fig. 1.

Fig. 3 is a schematic structural diagram of a battery cover plate assembly according to an embodiment of the present application.

Fig. 4 is an exploded view of the battery cover plate assembly shown in fig. 3.

Fig. 5 is a top view of the battery cover plate assembly shown in fig. 3.

Fig. 6 is a schematic sectional view of the battery cover plate assembly shown in fig. 5 along the direction a-a.

Fig. 7 is an enlarged structural view of a portion a of the battery cover plate assembly shown in fig. 6.

Fig. 8 is an enlarged structural view of a portion B of the battery cover plate assembly shown in fig. 7.

Fig. 9 is a first structural schematic diagram of a pole provided in the embodiment of the present application.

Fig. 10 is a second structural schematic diagram of the pole provided in the embodiment of the present application.

Fig. 11 is a schematic structural view of the pole shown in fig. 10 from another viewing angle.

Fig. 12 is a schematic structural diagram of a power battery provided in an embodiment of the present application.

Fig. 13 is an exploded view of the power cell shown in fig. 12.

Fig. 14 is a top view of the power cell shown in fig. 12.

FIG. 15 is a schematic cross-sectional view of the power cell of FIG. 14 taken along the direction B-B.

Fig. 16 is an enlarged schematic structural view of a part C of the power battery shown in fig. 15.

The reference numbers indicate:

10. a cover plate; 11. a pole through hole; 12. a protrusion; 13. a groove; 14. a first plate; 15. a second plate; 16. a step; 20. a pole column; 21. a first pole section; 22. a second pole section; 30. wrapping a rubber part; 40. a housing; 201. an anti-rotation groove.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

The embodiment of the application provides a apron, battery cover plate subassembly and power battery to solve the current not good problem of turning round performance of utmost point post of battery cover plate subassembly. The following description will be made with reference to the accompanying drawings.

Referring to fig. 1, fig. 1 is a schematic structural diagram of a cover plate 10 according to an embodiment of the present disclosure. Be equipped with on the apron 10 and be used for passing utmost point post through-hole 11 of utmost point post 20, the surface of apron 10 is provided with protruding group, and protruding group is including a plurality of archs 12 around utmost point post through-hole 11 interval setting.

The apron 10 that this application embodiment provided sets up a plurality of archs 12 through the surface at apron 10 around utmost point post through-hole 11 interval to wear to locate utmost point post through-hole 11 and with apron 10 fixed back of rubber coating of moulding plastics when utmost point post 20, can increase utmost point post 20's relative rotation resistance, make whole utmost point post 20 have better anti-twist performance.

Optionally, the number of the protrusions 12 may be set according to actual requirements, and two or more protrusions 12 may be provided. Illustratively, as shown in fig. 1, the protrusion set disposed on the surface of the cover plate 10 includes four protrusions 12, and the four protrusions 12 are disposed at intervals around the post through hole 11.

Further, a plurality of protrusions 12 are uniformly spaced around the post through-holes 11 on the surface of the cap plate 10. Through setting up a plurality of archs 12 even interval for the relative rotation resistance everywhere of utmost point post 20 is unanimous, thereby whole utmost point post 20 has more stable anti-twist performance. Illustratively, as shown in fig. 1, the protrusion set disposed on the surface of the cover plate 10 includes four protrusions 12, and the four protrusions 12 are uniformly spaced around the pole through hole 11.

Further, the cover plate 10 is further provided with a groove set, as shown in fig. 2, the groove set includes a plurality of grooves 13 arranged around the pole through hole 11 at intervals, one of the groove set and the protrusion set is arranged on the front surface of the cover plate 10, and the other is arranged on the back surface of the cover plate 10. Optionally, the number of the grooves 13 may be set according to actual requirements, and two or more grooves 13 may be provided. Illustratively, as shown in fig. 2, the protrusion set is disposed on the front surface of the cover plate 10, the groove set is disposed on the back surface of the cover plate 10, the groove set includes four grooves 13, and the four grooves 13 are disposed at intervals around the pole through hole 11. Of course, in other embodiments of the present application, the protrusion group may be disposed on the back surface of the cover plate 10, and the groove group may be disposed on the front surface of the cover plate 10. Preferably, the plurality of protrusions 12 correspond one-to-one to the plurality of grooves 13.

Optionally, the cover plate is a straight plate, the straight plate is provided with two pole through holes 11 and two protruding groups, and the two pole through holes 11 correspond to the two protruding groups one to one. Or, the apron includes first board 14 and connects two second boards 15 at 14 length direction both ends of first board respectively, and two second boards 15 are all perpendicular with first board 14, are equipped with utmost point post through-hole 11 and protruding group on second board 15 and/or the first board 14, promptly: can respectively set up a utmost point post through-hole 11 and protruding group on two second boards 15, also can set up two utmost point post through-holes 11 and protruding group on same second board 15, can also respectively set up an utmost point post through-hole 11 and protruding group on first board 14 and one of them second board 15. Or the cover plate is an annular rectangular frame body with one open side; or, the apron includes the roof, and the both ends bending type of roof becomes relative first end plate and second end plate, and roof, first end plate and/or second end plate are equipped with utmost point post through-hole 11 and protruding group, promptly: the two second end plates can be respectively provided with one polar post through hole 11 and one protruding group, the same second end plate can be provided with the two polar post through holes 11 and the two protruding groups, and the first end plate and one of the second end plates can be respectively provided with the one polar post through hole 11 and the one protruding group; or the cover plate comprises three plate bodies which are spliced to form a U-shaped structure.

Referring to fig. 3 to 8, the battery cover plate assembly provided in the embodiment of the present application includes an electrode post 20, a rubber coating member 30 and the cover plate 10 in any of the embodiments, the electrode post 20 is disposed through the electrode post through hole 11 of the cover plate 10, and the rubber coating member 30 is disposed at a gap between the electrode post 20 and the cover plate 10, a gap between two adjacent protrusions 12 and an outer periphery of the protrusion 12.

The battery cover plate component provided by the embodiment of the application sets up a plurality of bulges 12 around the 11 intervals of utmost point post through-hole through the surface at apron 10, and utmost point post 20 wears to locate utmost point post through-hole 11 and fixed with the rubber coating of moulding plastics of apron 10, and rubber coating piece 30 can increase utmost point post 20's relative rotation resistance with the combination of a plurality of bulges 12 for whole utmost point post 20 has better anti-twist performance, and battery cover plate component's leakproofness is also better simultaneously.

The assembly process of the battery cover plate component is as follows: wear to locate utmost point post 20 earlier in the utmost point post through-hole 11 on the apron 10, then carry out the rubber coating with utmost point post 20 and apron 10 and mould plastics, the in-process of moulding plastics, partly plastic can be filled in the space department between utmost point post 20 and apron 10, and partly plastic can be filled in the space department between two adjacent archs 12, and partly plastic can wrap in the periphery of protruding 12, and the plastic of these several parts can form rubber coating piece 30 after solidifying, accomplishes the assembly of battery cover board subassembly.

It can be understood that the injection molded rubber coating 30 facilitates the rapid assembly of the pole 20 to the cover plate 10, and the injection molded rubber coating 30 can be directly used as a sealing ring without additionally adding a sealing ring for sealing, so that the production cost can be reduced, and the processing efficiency can be improved. Alternatively, the overmold 30 may be a non-metallic material having a structural strength and a hermetic seal.

As shown in fig. 9, in some embodiments of the present application, the pole 20 includes a first pole section 21 and a second pole section 22 connected to the first pole section 21, the cross-sectional area of the second pole section 22 being larger than the cross-sectional area of the first pole section 21; the first pole part 21 is inserted into the pole through hole 11, and the second pole part 22 is located on the back surface side of the cover plate 10 with a gap from the back surface of the cover plate 10. Since the glue-wrapping member 30 is also disposed in the gap between the second pole portion 22 and the back surface of the cover plate 10, the connection strength between the pole 20 and the cover plate 10 can be increased.

As shown in fig. 10-11, in some embodiments of the present application, the pole 20 is provided with an anti-rotation groove 201 on the surface in contact with the overmold 30. Through setting up the recess 201 of preventing changeing to can further increase the relative rotation resistance of utmost point post 20, especially under utmost point post 20 is columniform's the condition, prevent that utmost point post 20 from taking place to rotate for apron 10 and rubber coating piece 30 under the effect of external force, promote utmost point post 20's the ability of preventing turning round. It can be understood that the anti-rotation groove 201 is combined with the protruding group on the cover plate 10, so that the relative rotation resistance of the pole 20 is greatly increased, and the whole pole 20 has better anti-twisting performance.

For example, the anti-rotation groove 201 may be provided on a side surface of the pole 20; when the pole 20 includes the first pole part 21 and the second pole part 22, the rotation-preventing groove 201 may be disposed on a side surface of the first pole part 21, a side surface of the second pole part 22, and/or a surface of the second pole part 22 facing a back surface of the cover plate 10 (as shown in fig. 10 to 11), that is: the anti-rotation grooves 201 may be formed only on the side surface of the first pole part 21, or the anti-rotation grooves 201 may be formed only on the side surface of the second pole part 22 facing the back surface of the cover plate 10, or the anti-rotation grooves 201 may be formed on both the side surface of the first pole part 21 and the side surface of the second pole part 22 facing the back surface of the cover plate 10, or the anti-rotation grooves 201 may be formed on both the side surface of the second pole part 22 and the side surface of the second pole part 22 facing the back surface of the cover plate 10, or the anti-rotation grooves 201 may be formed on both the side surface of the first pole part 21, the side surface of the second pole part 22, and the side surface of the second pole part 22 facing the back surface of the cover plate 10.

Optionally, the quantity of preventing changeing recess 201 can set up according to the actual demand, and this application does not do too much restriction to this, and the preferred recess 201 that prevents changeing that sets up two or more to utmost point post 20 prevents turning round the effect better. For example, as shown in fig. 10 and 11, four rotation-preventing grooves 201 are provided on one surface of the second pole part 22 facing the back surface of the cover plate 10, and the four rotation-preventing grooves 201 are arranged at intervals around the circumference of the second pole part 22. Of course, in other embodiments, a plurality of rotation-preventing grooves 201 may be provided on the side surface of the first pole part 21 or the side surface of the second pole part 22.

Alternatively, the cover plate 10 may be a straight plate; or, the cover plate 10 is a U-shaped cover plate, and the pole 20 is disposed on the bottom surface and/or the side surface of the U-shaped cover plate, that is, the pole 20 may be disposed only on the bottom surface or the side surface of the U-shaped cover plate, or the pole 20 may be disposed on both the bottom surface and the side surface of the U-shaped cover plate. Illustratively, as shown in fig. 3, the cover plate 10 includes a first plate 14 and two second plates 15 respectively connected to two ends of the first plate 14 in the length direction, each of the two second plates 15 is perpendicular to the first plate 14, the cover plate assembly includes two poles 20, one of the two poles 20 is a positive pole 20, the other is a negative pole 20, and the two poles 20 are both disposed on the first plate 14 of the cover plate 10 (as shown in fig. 3); alternatively, the two poles 20 are arranged on the same second plate 15 of the cover plate 10; alternatively, one of the poles 20 is disposed on one of the second plates 15 of the cover plate 10, and the other pole 20 is disposed on the other second plate 15 of the cover plate 10. In other embodiments of the present application, the cover plate 10 may also be an annular rectangular frame with an opening on one side; or, the cover plate 10 includes a top plate, two ends of the top plate are bent to form a first end plate and a second end plate which are opposite to each other, and the top plate, the first end plate and/or the second end plate are provided with a pole; alternatively, the cover plate 10 includes three plate bodies, and the three plate bodies are spliced to form a U-shaped structure.

Referring to fig. 12 to 16, a power battery provided in an embodiment of the present application includes a battery cover plate assembly in any one of the embodiments. The combination of the rubber coating 30 and the protrusions 12 in the battery cover plate assembly can increase the relative rotation resistance of the pole 20, so that the whole pole 20 has better torsion resistance, the sealing performance of the battery cover plate assembly is better, and impurities such as dust and moisture are prevented from entering the battery core through the pole 20 and a gap between the pole and the cover plate 10.

Further, the power battery further comprises a battery core and a shell 40 with an opening, the battery core is arranged in the shell 40, the shape of the opening of the shell 40 is matched with that of the cover plate 10, and the cover plate 10 is connected to the opening of the shell 40 in a sealing mode. It should be understood that the term "front surface of the cover plate 10" in the present application refers to a surface of the cover plate 10 facing the outside of the housing 40 after the cover plate 10 is sealed with the housing 40; the "back surface of the cover plate 10" refers to a surface of the cover plate 10 facing the inside of the case 40 after the cover plate 10 is sealed with the case 40.

In some embodiments of the present application, the housing 40 is a three-sided open housing and the cover 10 is a U-shaped cover. The cover plate 10 and the shell 40 are formed by directly bending metal sheets in the above structural form, and compared with the conventional battery shell formed by stamping, extruding or welding, the manufacturing difficulty is low and the cost is low. Illustratively, as shown in fig. 13, the housing 40 is a cuboid housing with three open sides, the U-shaped cover plate includes a first plate 14 and two second plates 15 respectively connected to two ends of the first plate 14 in the length direction, both the two second plates 15 are perpendicular to the first plate 14, and the first plate 14 and the two second plates 15 respectively cover the three open sides of the housing 40. Alternatively, the housing 40 may be a rectangular (e.g., square or rectangular) housing with three open sides, that is, three adjacent sides of the rectangular housing are open; the cover plate 10 may be an annular rectangular frame with one open side, that is, one open side of the annular rectangular frame is opened to form a U-shaped cover plate, so that the structure of the cover plate 10 matches with the housing 40 to be connected to the opening of the housing 40 in a sealing manner. Or, the casing 40 includes a bottom plate, a first side plate and a second side plate, two sides of the bottom plate are bent to form the first side plate and the second side plate which are opposite to each other, and a cavity for accommodating the battery cell is formed among the bottom plate, the first side plate and the second side plate; the U-shaped cover plate comprises a top plate, a first end plate and a second end plate, the two ends of the top plate are bent to form the first end plate and the second end plate which are opposite, and the cover plate 10 covers the shell body 40 to form a rectangular battery shell. Or, the casing 40 is a rectangular frame, and the rectangular frame is provided with a U-shaped groove which penetrates through two opposite side walls of the rectangular frame along the length direction of the U-shaped groove; the cover plate 10 comprises three plate bodies, the three plate bodies are spliced to form a U-shaped cover plate, and the three plate bodies are respectively covered at the opening of the U-shaped groove and the two ends of the U-shaped groove, so that a cavity for accommodating the battery cell is formed between the U-shaped groove and the three plate bodies. Or, the casing 40 is a U-shaped frame member, the U-shaped frame member includes a bottom wall, a first side wall and a second side wall, the first side wall and the second side wall are connected with the bottom wall and extend upwards from the bottom wall, the first side wall and the second side wall are arranged oppositely, and a space for accommodating the battery cell is defined between the bottom wall and the first side wall and between the bottom wall and the second side wall; the cover plate 10 comprises a top plate, a first side plate and a second side plate, wherein the first side plate and the second side plate are perpendicular to the top plate and extend, and the top plate, the first side plate and the second side plate are respectively covered at three openings of the U-shaped frame member.

Of course, in other embodiments of the present application, one surface of the housing 40 may be open, the cover plate 10 may be a straight plate, and the cover plate 10 covers the opening of the housing 40.

As shown in fig. 8 and 16, alternatively, the edge of the back surface of the cap plate 10 is provided with a step 16 along the circumferential direction of the cap plate 10, and the edge of the case 40 abuts against the surface of the step 16 and is welded to the cap plate 10. As can be understood, in the process of welding the cover plate 10 and the casing 40, the solder residues may fall into the casing 40, and the battery core is easily damaged when the solder residues contact the battery core, so that the step 16 is provided at the edge of the back surface of the cover plate 10 along the circumferential direction of the cover plate 10, and the edge of the casing 40 abuts against the surface of the step 16, so that the solder residues generated in the process of welding the cover plate 10 and the casing 40 can be prevented from falling into the casing 40 and contacting the battery core, and the battery core is prevented from being damaged by the solder residues; moreover, the step 16 can accurately position the cover plate 10 on the housing 40, which helps to improve the packaging efficiency.

In the foregoing embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.

In the description of the present application, the terms "first", "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more features.

The ice making device provided by the embodiments of the present application is described in detail above, and the principles and embodiments of the present application are explained herein by applying specific examples, and the above description of the embodiments is only used to help understand the method and the core idea of the present application; meanwhile, for those skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.

Claims (9)

1. The cover plate is characterized in that the cover plate is provided with pole through holes (11) for penetrating through poles (20), the surface of the cover plate is provided with a protrusion group and a groove group, the protrusion group comprises a plurality of protrusions (12) arranged around the pole through holes (11) at intervals, the groove group comprises a plurality of grooves (13) arranged around the pole through holes (11) at intervals, one of the groove group and the protrusion group is arranged on the front surface of the cover plate, and the other one of the groove group and the protrusion group is arranged on the back surface of the cover plate.

2. The cover plate according to claim 1, characterized in that a plurality of the protrusions (12) are evenly spaced around the pole through hole (11) at the surface of the cover plate.

3. The cover plate according to claim 1, characterized in that a plurality of said projections (12) correspond one-to-one with a plurality of said recesses (13).

4. The cover plate according to any one of claims 1 to 3, wherein the cover plate is a straight plate;

or the cover plate comprises a first plate (14) and two second plates (15) respectively connected to two ends of the first plate (14) in the length direction, the two second plates (15) are both perpendicular to the first plate (14), and the pole through holes (11) and the protrusion groups are arranged on the second plate (15) and/or the first plate (14);

or the cover plate is an annular rectangular frame body with an opening on one surface;

or the cover plate comprises a top plate, two ends of the top plate are bent to form a first end plate and a second end plate which are opposite, and the top plate, the first end plate and/or the second end plate are/is provided with the pole through hole (11) and the protrusion group;

or the cover plate comprises three plate bodies which are spliced to form a U-shaped structure.

5. A battery cover plate component, characterized by comprising a pole (20), an encapsulating member (30) and the cover plate according to any one of claims 1-4, wherein the pole (20) is arranged in the pole through hole (11) of the cover plate, and the encapsulating member (30) is arranged in the gap between the pole (20) and the cover plate, the gap between two adjacent protrusions (12) and the periphery of the protrusions (12).

6. The battery cover plate assembly according to claim 5, wherein the pole (20) is provided with an anti-rotation groove (201) on the surface in contact with the encapsulating member (30);

and/or, utmost point post (20) include first pole portion (21) and with second pole portion (22) that first pole portion (21) are connected, the cross-sectional area of second pole portion (22) is greater than the cross-sectional area of first pole portion (21), first pole portion (21) wear to locate utmost point post through-hole (11), second pole portion (22) be located the apron the back side and with have the space between the back of apron.

7. A power cell comprising a cell cover assembly according to any of claims 5 to 6.

8. The power battery of claim 7, further comprising a battery core and a casing (40) having an opening, wherein the battery core is disposed in the casing (40), the opening of the casing (40) is shaped to match the cover plate, and the cover plate is hermetically connected to the opening of the casing (40).

9. The power battery according to claim 8, wherein the back edge of the cover plate is provided with a step (16) along the circumferential direction of the cover plate, and the edge of the housing (40) abuts against the surface of the step (16) and is welded with the cover plate.

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