CN219959354U - Post anti-torsion structure, cover plate assembly and power battery - Google Patents

Abstract

The utility model provides a pole torsion preventing structure, a cover plate assembly and a power battery, wherein the pole torsion preventing structure comprises a pole, a lower plastic part and a metal cover plate; the lower plastic part comprises a plastic plate, a first positioning protrusion, a second positioning protrusion and a first mounting hole; the metal cover plate comprises a base plate, a second mounting groove and a second mounting hole. According to the pole torsion preventing structure provided by the utility model, the torsion of the pole in the horizontal direction is controlled by utilizing the non-circular structure of the base, the first mounting groove, the second positioning protrusion and the second mounting groove; the stability of the assembled pole is better, the pole is not easy to loose even after the power battery is used for a long time, and the damage to the pole caused by welding and fixing the pole is avoided; the cover plate component adopts the pole torsion preventing structure, so that the assembly of the positive pole and the negative pole in the cover plate component is safer and more stable, and the use safety, stability and service life of the power battery can be improved.

Description

Post anti-torsion structure, cover plate assembly and power battery

Technical Field

The utility model relates to the technical field of lithium batteries, in particular to a pole torsion-preventing structure, a cover plate assembly and a power battery.

Background

A power cell is an energy device that provides a source of power for a tool. The power battery is a core component of the current new energy automobile. The power battery comprises a metal shell, a battery core assembly arranged in the metal shell and a cover plate assembly fixed at the top of the metal shell, wherein the cover plate assembly is provided with a positive electrode post, a negative electrode post, an explosion-proof valve, a liquid injection hole and other structures. The positive electrode post of the cover plate assembly is electrically connected with the positive electrode lug of the battery cell assembly, and the negative electrode post is electrically connected with the negative electrode lug of the battery cell assembly, so that electric energy conduction of the power battery is realized. The pole column arranged on the cover plate component in the power battery plays an important role in electric energy transmission, and the stability of the pole column determines the performance of the power battery. Therefore, the pole can not twist horizontally or move axially when in use.

Most of the existing power batteries adopt a welding mode to fix the pole on the cover plate assembly so as to ensure that the pole cannot axially move and horizontally twist. However, the pole structure fixed by adopting the welding mode is easy to cause bubbles and cracks to the pole due to the stress generated during welding, so that the pole is damaged. And the terminal post is fixed on the cover plate component in a riveting mode or a thread locking mode, and the terminal post is loosened after the power battery is used for a long time, so that the service life of the power battery is influenced.

Disclosure of Invention

The utility model aims to solve the defects that when a pole is fixed in a cover plate assembly of the existing power battery in a welding mode, the pole is easy to be influenced by welding stress to generate bubbles and cracks, and when the pole is fixed in a riveting and thread mode, the pole is easy to loosen after a long time, and provides a pole torsion preventing structure.

The technical scheme adopted for solving the technical problems is as follows: the pole torsion preventing structure comprises a pole, wherein the pole comprises a column body and a base arranged at the bottom of the column body, and the cross-sectional area of the column body is smaller than that of the base; the lower plastic part comprises a plastic plate, a first positioning protrusion arranged on the bottom surface of the plastic plate, a second positioning protrusion arranged on the top surface of the plastic plate and a first mounting hole penetrating through the first positioning protrusion and the second positioning protrusion, and a first mounting groove for embedding a base of the pole is formed in the first positioning protrusion; the metal cover plate comprises a base plate, a second mounting groove and a second mounting hole, the second mounting groove is arranged on the bottom surface of the base plate and can be used for embedding a second positioning protrusion of the lower plastic part, and the second mounting hole is arranged in the second mounting groove and penetrates through the base plate; the base of the pole, the first mounting groove of the lower plastic part, the second positioning protrusion and the second mounting groove of the metal cover plate are identical in outline and are of non-circular structures.

In one embodiment, the base of the pole, the first mounting groove of the lower plastic part, the second positioning protrusion and the second mounting groove of the metal cover plate have regular polygonal outlines.

In one embodiment, the first positioning protrusion of the lower plastic part is consistent with the outline of the first mounting groove, and the cross-sectional area of the first mounting groove is larger than that of the first mounting hole.

In one embodiment, the depth of the first mounting groove is greater than or equal to the height of the first positioning protrusion, and the depth of the first mounting groove is smaller than the sum of the thickness of the first positioning protrusion and the thickness of the plastic plate.

In one embodiment, the first positioning protrusion and the second positioning protrusion are located on two side surfaces of the plastic plate in the same vertical direction, and the cross-sectional area of the first positioning protrusion is not equal to the cross-sectional area of the second positioning protrusion.

In one embodiment, the depth of the second mounting groove of the metal cover plate is greater than or equal to the height of the second positioning protrusion of the lower plastic part.

In one embodiment, the depth of the second mounting groove is 1/3-1/2 of the thickness of the substrate.

In one embodiment, the aperture of the first mounting hole of the lower plastic part and the aperture of the second mounting hole of the metal cover plate are both larger than the outer diameter of the column body of the pole, and the aperture of the second mounting hole of the metal cover plate is smaller than the aperture of the first mounting hole of the lower plastic part.

The utility model also provides a cover plate assembly, which comprises the pole anti-torsion structure.

The utility model also provides a power battery, which comprises the cover plate assembly.

The pole torsion preventing structure, the cover plate assembly and the power battery provided by the utility model have the beneficial effects that: the pole anti-torsion structure realizes the control of horizontal torsion of the pole through the mutual coordination between the first mounting groove in the first positioning bulge of the lower plastic part and the base of the pole, has better stability after the pole is assembled, is not easy to loosen even after the power battery is used for a long time, also avoids the damage to the pole caused by welding and fixing the pole, and has simple metal cover plate, lower plastic part and pole anti-torsion structure and easy processing; adopt above-mentioned utmost point post anti-torsion structure in the apron subassembly for the assembly of positive pole post and negative pole post in the apron subassembly is safer stable, and then solves the problem that positive pole post and negative pole post are in axial offset or horizontal torsion in the apron subassembly, also can promote security, stability and the life that power battery used.

Drawings

FIG. 1 is an exploded view of a first view of a pole anti-twist structure according to the present utility model;

FIG. 2 is an exploded view of a second view of a pole anti-twist structure according to the present utility model;

FIG. 3 is a front view of a pole anti-twist structure provided by the present utility model;

FIG. 4 is a cross-sectional view of A-A of FIG. 3;

FIG. 5 is a cross-sectional view of a lower plastic part in a pole anti-twist structure provided by the utility model;

FIG. 6 is a cross-sectional view of a metal cover plate in a post anti-twist structure provided by the present utility model;

FIG. 7 is a schematic perspective view of a cover assembly according to the present utility model;

fig. 8 is a schematic perspective view of a power battery according to the present utility model.

Reference numerals illustrate:

100-pole torsion preventing structure, 200-cover plate assembly and 300-power battery;

10-polar column, 11-column and 12-base;

20-lower plastic parts, 21-plastic plates, 22-first positioning protrusions, 221-first mounting grooves, 23-second positioning protrusions and 24-first mounting holes;

30-metal cover plate, 31-base plate, 32-second mounting groove and 33-second mounting hole;

h1-the height of the first positioning bulge and H2-the height of the second positioning bulge;

thickness of the substrate of the H3-metal cover plate;

l1-the depth of the first mounting groove, L2-the depth of the second mounting groove;

d1-the aperture of the first mounting hole, D2-the aperture of the second mounting hole, D3-the outer diameter of the cylinder.

Detailed Description

The present utility model will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present utility model more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model.

Referring to fig. 1-6, a pole anti-twisting structure 100 according to the present utility model is provided. The pole torsion preventing structure 100 is suitable for most of the power batteries 300 on the market at present, and can be used on the cover plate assembly 200 at the top of the metal shell in the power battery 300 instead of the traditional fixing modes such as welding, riveting, screws and the like for torsion preventing connection of the pole 10 and the metal cover plate 30.

As shown in fig. 1 and 2, the pole anti-twisting structure 100 provided by the present utility model includes a pole 10, a lower plastic member 20 and a metal cover plate 30. The lower plastic part 20 is fixed at the bottom of the metal cover plate 30, plays a role of insulating the metal cover plate 30 from the battery cells of the power battery 300, the pole 10 is penetrated between the lower plastic part 20 and the metal cover plate 30, the bottom of the pole 10 is electrically connected with the pole lugs arranged on the battery cells inside the power battery 300, and the top of the pole 10 penetrates through the lower plastic part 20 and the metal cover plate 30 to extend out of the housing of the power battery 300 and serve as a terminal for electric energy conduction. Generally, two sets of poles 10 are simultaneously disposed on the cover plate assembly 200 of the power battery 100 as electric energy conducting terminals, or two cover plate assemblies are respectively disposed on two sides of the power battery, and one pole 10 is correspondingly disposed on the two cover plate assemblies as electric energy conducting terminals. In this embodiment, as shown in fig. 1 and 2, two mounting positions for fixing the pole 10 are simultaneously provided on the metal cover plate 30 and the lower plastic member 20. Only the connection between the metal cover plate 30 and the lower plastic part 20 and the pole 10 in one mounting position is shown in the figures.

Specifically, as shown in fig. 1 and 2, a pole 10 in a pole anti-twisting structure 100 provided by the present utility model includes a column 11 and a base 12 disposed at the bottom of the column 11. The column 11 and the base 12 in the electrode column 10 may be made of the same material to form an anode electrode column, or may be made of two different materials to form a cathode electrode column. The column 11 of the pole 10 extends from the inside of the metal shell of the power battery 300 to the outside of the power battery 300 through the cover plate assembly 200, and the base 12 of the pole 10 is arranged in the metal shell of the power battery 300 and is directly connected with the pole lug on the battery core or electrically connected with the pole lug through a connecting sheet. In order to achieve a better fixing effect of the pole 10 and a connection effect with the tab, the cross-sectional area of the post 11 of the pole 10 is smaller than that of the base 12. The cross-sectional area of the base 12 is larger than that of the column 11, so that the base 12 can be more contacted and fixed with the lower plastic part 20, and the contact area for electrical connection with the tab can be increased.

Further, the lower plastic part 20 in the pole torsion preventing structure 100 provided by the utility model comprises a plastic plate 21. The lower plastic part 20 is in a rectangular sheet structure as a whole, and when assembled, the lower plastic part 20 is fixed at the bottom of the metal cover plate 30 and is connected with the metal cover plate 30 into a whole. The top surface of the plastic plate 21 is fixedly connected with the metal cover plate 30. The lower plastic part 20 further comprises a first positioning protrusion 22 arranged on the bottom surface of the plastic plate 21 and a second positioning protrusion 23 arranged on the top surface of the plastic plate 21. The first positioning protrusion 22 is used for connecting with the pole 10 and is matched with the base 12 of the pole 10 to realize torsion prevention of the pole 10. Specifically, as shown in fig. 1, the lower plastic member 20 is provided with a first mounting groove 221 at the first positioning protrusion 22 for the base 12 of the pole 10 to be embedded. When assembled, the column 11 of the pole 10 passes through the lower plastic member 20, the base 12 of the pole 10 is embedded into the first mounting groove 221 of the lower plastic member 20, and the first mounting groove 221 and the contour of the base 12 are mutually matched and embedded, so that the deflection and torsion of the base 12 of the pole 10 in the horizontal direction are limited by the first mounting groove 221 arranged in the first positioning protrusion 22. And, the second positioning protrusion 23 of the lower plastic part 20 is used for being connected with the metal cover plate 30 and matched with the metal cover plate 30 to realize anti-torsion between the metal cover plate 30 and the lower plastic part 20. On the plastic plate 21 of the lower plastic part 20, the first positioning protrusion 22 and the second positioning protrusion 23 are located on the same vertical axis.

Specifically, as shown in fig. 1, the lower plastic part 20 provided by the present utility model further includes a first mounting hole 24 disposed on the plastic plate 21 and penetrating the first positioning protrusion 22 and the second positioning protrusion 23. The first mounting hole 24 provided on the plastic plate 21 allows the column 11 of the pole 10 to pass through. And the first mounting hole 24 is positioned on the same vertical axis as the first positioning protrusion 22 and the second positioning protrusion 23. The first positioning protrusion 22, the second positioning protrusion 23 and the first mounting hole 24 of the lower plastic part 20 form mounting positions for fixing and preventing torsion of the pole 10, and two mounting positions are simultaneously arranged on the lower plastic part 20 and are respectively used for mounting and fixing the two poles.

Further, as shown in fig. 1 and 2, the metal cover plate 30 in the pole anti-twisting structure 100 provided by the utility model includes a base plate 31 and a second mounting groove 32 disposed on the bottom surface of the base plate 31 for embedding the second positioning protrusion 23 of the lower plastic member 20. The base plate 31 of the metal cover plate 30 has a rectangular sheet-like structure formed of aluminum material. The bottom surface of the metal cover plate 30 is fixedly connected with the lower plastic member 20, and the second mounting groove 32 provided on the bottom surface is just used for limiting the horizontal offset and torsion between the lower plastic member 20 and the metal cover plate 30. During assembly, the second positioning protrusion 23 of the lower plastic part 20 is embedded into the second mounting groove 32 of the metal cover plate 30, and the torsion prevention between the lower plastic part 20 and the metal cover plate 30 is realized through the mutual fit and embedding of the second positioning protrusion 23 and the second mounting groove 32.

Specifically, the metal cover 30 further includes a second mounting hole 33 disposed in the second mounting groove 32 and penetrating through the base plate 31, and the second mounting hole 33 is configured to allow the column 11 of the pole 10 to penetrate therethrough, so that the top end of the column 11 of the pole 10 extends out of the metal cover 30. During assembly, the lower plastic part 20 is fixed at the bottom of the metal cover plate 30, and the pole 10 passes through the lower plastic part 20 and the metal cover plate 30 from bottom to top from the bottom of the lower plastic part 20, that is, the column 11 of the pole 10 passes through between the first mounting hole 24 of the lower plastic part 20 and the second mounting hole 33 of the metal cover plate 30.

Further, in the pole anti-twisting structure 100 provided by the present utility model, the outer shape of the base 12 of the pole 10, the first mounting groove 221 of the lower plastic member 20, the second positioning protrusion 23 and the second mounting groove 32 of the metal cover 30 are identical, and are all non-circular structures. In the actual assembly process, the base 12 of the pole 10 is embedded into the first mounting groove 221 of the lower plastic member 20, so that the limit in the horizontal direction is realized through the non-circular structure with the same outline of the base 12 and the first mounting groove 221. The second positioning protrusion 23 of the lower plastic part 20 is embedded into the second mounting groove 32 of the metal cover plate 30, so that the limit in the horizontal direction is realized through the non-circular structure with the same outline of the second positioning protrusion 23 and the second mounting groove 32. Post anti-twist structure 100 after assembly is shown in fig. 3 and 4. The present utility model provides a pole anti-twisting structure 100, which uses a non-circular structure of a base 12, a first mounting groove 221, a second positioning protrusion 23 and a second mounting groove 32 to control the twisting of a pole 10 in the horizontal direction. After the pole 10 is mounted on the lower plastic member 20 and the metal cap plate 30, the air tightness between the pole 10 and the cap plate assembly 200 can be achieved by a sealing ring (not shown in the drawings) provided between the metal cap plate 30 and the lower plastic member 20. Meanwhile, the pole 10 and the cover plate assembly are also fixed by sleeving an upper plastic part and a pressing plate (not shown in the figure) on the column 11 of the pole 10. Therefore, the anti-twisting structure 100 provided by the utility model has better stability after the pole 10 is assembled, and the pole 10 is not easy to loose even after the power battery is used for a long time. The pole anti-torsion structure 100 provided by the utility model realizes the anti-torsion structure in a mutually embedded mode, so that the pole 10 is not required to be fixed on a cover plate assembly in a welding, riveting or screwing mode, the damage of the pole 10 caused by welding can be avoided, and the metal cover plate 30, the lower plastic part 20 and the pole 10 in the pole anti-torsion structure 100 are simple in anti-torsion structure and easy to process, and are suitable for large-scale and batch production and processing.

Specifically, as shown in fig. 1 and 2, in the pole anti-twisting structure 100 provided by the present utility model, the outline of the base 12 of the pole 10, the first mounting groove 221 of the lower plastic member 20, the second positioning protrusion 23, and the second mounting groove 32 of the metal cover 30 are all regular polygon structures. The regular polygon structure includes, but is not limited to, regular triangle, square, regular hexagon, regular octagon, etc. On one hand, the stability is better when the regular polygon structures are mutually embedded, and on the other hand, the regular polygon structures are easy to process and convenient for mass production. In this embodiment, the base 12, the first mounting groove 221, the second positioning protrusion 23 and the second mounting groove 32 are all regular octagons, and the regular octagons are selected to better control the processing size of each structure, and to better restrict each other when the regular octagons are mutually embedded, so as to prevent torsion between the two structures.

Specifically, as shown in fig. 1, the first positioning protrusion 22 is located on the bottom surface of the plastic plate 21 of the lower plastic part 20, and the outer contour of the first positioning protrusion 22 may be provided in a circular shape or the like, whereas in the present embodiment, the first positioning protrusion 22 of the lower plastic part 20 is identical to the outer contour of the first mounting groove 221. And the first mounting groove 221 has a cross-sectional area larger than that of the first mounting hole 24, so that the lower plastic member 20 forms a stepped surface between the first mounting groove 221 and the first mounting hole 24, through which the relative movement of the base 12 of the pole 10 in the vertical direction is restricted, and by which the base 12 of the pole 10 is fixed on the bottom surface of the lower plastic member 20. As shown in fig. 3, a front view of the pole anti-twisting structure 100 according to the present utility model after assembly is shown. As shown in fig. 4, after the assembly, the base 12 of the pole 10 is embedded into the first mounting groove 221 on the bottom surface of the lower plastic member 20, and the top edge of the base 12 is attached to the step surface formed by the first mounting groove 221 and the first mounting hole 24.

Specifically, as shown in fig. 5, a cross-sectional view of the lower plastic member 20 in the pole anti-twisting structure 100 according to the present utility model is shown. The depth L1 of the first mounting groove 221 in the lower plastic part 20 is greater than the height H1 of the first positioning protrusion 22, and the depth L1 of the first mounting groove 221 is smaller than the sum of the thicknesses of the first positioning protrusion 22 and the plastic plate. That is, the bottom surface of the first mounting groove 221 is located between the top surface and the bottom surface of the plastic plate 21 of the lower plastic part 20, that is, the first mounting groove 221 and the top surface and the bottom surface of the plastic plate 21 are disposed parallel to each other in the horizontal direction, but are offset from each other in the height in the horizontal direction. Similarly, as shown in fig. 5, the first positioning protrusion 22 and the second positioning protrusion 23 of the lower plastic part 20 are located on two side surfaces of the plastic plate 21 in the same vertical direction, and the cross-sectional area of the first positioning protrusion 22 is not equal to the cross-sectional area of the second positioning protrusion 23, i.e. the outer contour of the first positioning protrusion 22 and the outer contour of the second positioning protrusion 23 are arranged parallel to each other in the vertical direction, but are staggered from each other in the vertical direction. By doing so, it is possible to ensure that both the annular profile provided on the bottom surface of the lower plastic part 20 and the annular profile provided on the top surface of the lower plastic part 20 have sufficient rigidity and hardness to limit torsion.

Specifically, as shown in fig. 4, a sectional view of the post anti-twisting structure 100 according to the present utility model is shown after assembly. As shown in fig. 4, the second positioning protrusion 23 of the lower plastic part 20 is completely embedded into the second mounting groove 32 of the metal cover plate 30, so that the top surface of the plastic plate 21 of the lower plastic part 20 can completely fit with the bottom surface of the metal cover plate 30, and the tight fit between the lower plastic part 20 and the metal cover plate 30 is realized. The depth L2 of the second mounting groove 32 of the metal cover plate 30 is greater than or equal to the height H2 of the second positioning protrusion 23 of the lower plastic member 20, so as to ensure the connection stability between the metal cover plate 30 and the lower plastic member 20 during assembly.

Fig. 6 is a cross-sectional view of the metal cover plate 30 in the pole anti-twisting structure 100 according to the present utility model. The base plate 31 of the metal cover plate 30 is a rectangular sheet structure, and is located on the top surface of the lower plastic member 20 during assembly. The top surface of the base plate 31 is also provided with positioning holes matched with other components related to the installation of the pole 10, such as an upper plastic part, and the second mounting groove 32 arranged on the top surface of the base plate 31 is matched with the lower plastic part 20. Therefore, the depth L2 of the second mounting groove 32 at the bottom of the substrate 31 is 1/3 to 1/2 of the thickness H3 of the substrate 31. In the present embodiment, the thickness of the base plate 31 is 2mm, and the depth L2 of the second mounting groove 32 is 0.9mm.

In the pole anti-twisting structure 100 provided by the present utility model, when the pole 10 is assembled to the metal cover plate 30 and the lower plastic member 20, in order to ensure the air tightness between the pole 10 and the two, as shown in fig. 4, a sealing ring (not shown) is further required to be disposed in a space enclosed by the base 20 of the pole 10 and the first mounting hole 24 of the lower plastic member 20 and the bottom surface of the metal cover plate 30. The sealing ring is pressed in the first mounting hole 24 of the lower plastic member 20 by the metal cover plate 30 and the base 20 of the pole 10 in the vertical direction, and is sleeved on the column 11 of the pole 10 in the horizontal direction, is limited on the outer side of the column 11 of the pole 10 by the first mounting hole 24 of the lower plastic member 20, and is tightly pressed. Therefore, the aperture D1 of the first mounting hole 24 of the lower plastic part 20 and the aperture D2 of the second mounting hole 33 of the metal cover plate 30 are both larger than the outer diameter D3 of the column 11 of the pole 10, and the aperture of the second mounting hole 33 of the metal cover plate 30 is smaller than the aperture of the first mounting hole 24 of the lower plastic part 20, so that a step surface is formed between the bottom surface of the metal cover plate 30 and the second positioning protrusion 23 of the lower plastic part 20 during assembly, and the outer ring edge of the top surface of the sealing ring is pressed by using the step surface.

Fig. 7 is a schematic perspective view of a cover assembly 200 according to the present utility model. The utility model also provides a cover plate assembly 200 comprising the pole anti-torsion structure 100. Be provided with positive pole post and negative pole post on this apron subassembly 200, positive pole post and negative pole post on this apron subassembly 200 have all adopted foretell utmost point post anti-torsion structure 100 for positive pole post and negative pole post all need not to weld or rivet with the metal cover plate 30 on the apron subassembly 200, have avoided because the damage to utmost point post 10 that the welding caused, adopt foretell utmost point post anti-torsion structure 100 simultaneously can guarantee the stability of utmost point post 10 on metal cover plate 30 and lower plastic part 20 horizontal direction, avoid post 10 to take place not hard up or horizontal migration, horizontal torsion's problem after the time of last time, in order to promote the stability of apron subassembly 200 upper electrode post 10 and apron bulk connection.

Fig. 8 is a schematic perspective view of a power battery 300 according to the present utility model. The utility model also provides a power battery 300 comprising the cover plate assembly 200. The power battery 300 adopts the cover plate assembly 200, and the cover plate assembly 100 uses the pole anti-torsion structure 100, so that the pole 10 and the cover plate assembly 200 still maintain good connection stability without riveting, welding and other modes, horizontal offset or torsion cannot occur, the safety and stability of the power battery 300 during use are improved, and the service life of the power battery 300 is prolonged.

Compared with the prior art, the pole anti-torsion structure 100, the cover plate assembly 200 and the power battery 300 provided by the utility model have the following beneficial effects:

1. the pole torsion preventing structure 100 controls the horizontal torsion of the pole 10 by the mutual cooperation between the first mounting groove 221 in the first positioning protrusion 22 of the lower plastic part 20 and the base 12 of the pole 10, controls the mutual torsion between the lower plastic part 20 and the metal cover 30 by the mutual cooperation between the second positioning protrusion 23 of the lower plastic part 20 and the second mounting groove 32 of the metal cover 30, and controls the torsion of the pole 10 in the horizontal direction by using the non-circular structure of the base 12, the first mounting groove 221, the second positioning protrusion 23 and the second mounting groove 32.

2. The stability of post 10 after the assembly is better, even after long-time use at power battery, post 10 also is difficult for appearing not hard up, has also avoided through welded fastening post 10 and has caused the damage to post 10, and metal cover plate 30, lower plastic part 20 and the anti-torsion structure of post 10 in this post anti-torsion structure 100 are simple, easy processing.

3. The above-mentioned pole anti-torsion structure 100 is adopted in the cover plate assembly 200, so that the assembly of the positive pole and the negative pole in the cover plate assembly 200 is safer and more stable, and further the problem that the positive pole and the negative pole in the cover plate assembly 200 are axially offset or horizontally twisted is solved, and the use safety and stability of the power battery 300 can be improved, and the service life of the power battery 300 can be prolonged.

The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the utility model.

Claims (10)

1. The utility model provides a utmost point post prevents torsion structure which characterized in that includes

The pole comprises a column body and a base arranged at the bottom of the column body, and the cross-sectional area of the column body is smaller than that of the base;

the lower plastic part comprises a plastic plate, a first positioning protrusion arranged on the bottom surface of the plastic plate, a second positioning protrusion arranged on the top surface of the plastic plate and a first mounting hole penetrating through the first positioning protrusion and the second positioning protrusion, and a first mounting groove for embedding a base of the pole is formed in the first positioning protrusion;

the metal cover plate comprises a base plate, a second mounting groove and a second mounting hole, the second mounting groove is arranged on the bottom surface of the base plate and can be used for embedding a second positioning protrusion of the lower plastic part, and the second mounting hole is arranged in the second mounting groove and penetrates through the base plate;

the base of the pole, the first mounting groove of the lower plastic part, the second positioning protrusion and the second mounting groove of the metal cover plate are identical in outline and are of non-circular structures.

2. The pole torsion preventing structure of claim 1, wherein the base of the pole, the first mounting groove of the lower plastic member, the second positioning protrusion and the second mounting groove of the metal cover plate are all regular polygon structures in outline.

3. The pole twisting prevention structure of claim 2, wherein the first positioning protrusion of the lower plastic member is in conformity with the outline of the first mounting groove, and the cross-sectional area of the first mounting groove is larger than the cross-sectional area of the first mounting hole.

4. A pole twisting prevention structure according to claim 3, wherein the depth of the first mounting groove is greater than the height of the first positioning protrusion, and the depth of the first mounting groove is less than the sum of the thickness of the first positioning protrusion and the thickness of the plastic plate.

5. The pole twisting prevention structure of claim 2, wherein the first positioning protrusion and the second positioning protrusion are located on both side surfaces of the plastic plate in the same vertical direction, and the cross-sectional area of the first positioning protrusion is not equal to the cross-sectional area of the second positioning protrusion.

6. The pole twisting prevention structure of claim 2, wherein the depth of the second mounting groove of the metal cover plate is greater than or equal to the height of the second positioning protrusion of the lower plastic member.

7. A pole twist preventing structure as set forth in claim 6, wherein the depth of said second mounting groove is 1/3-1/2 of the thickness of said base plate.

8. The pole torsion preventing structure of claim 1, wherein the aperture of the first mounting hole of the lower plastic member and the aperture of the second mounting hole of the metal cover plate are larger than the outer diameter of the pole body, and the aperture of the second mounting hole of the metal cover plate is smaller than the aperture of the first mounting hole of the lower plastic member.

9. A cover plate assembly comprising the pole anti-twist structure of any one of claims 1-8.

10. A power cell comprising the cover assembly of claim 9.