CN219739109U - Lower plastic, end cover assembly, battery and energy storage device - Google Patents

Abstract

The utility model provides a lower plastic, an end cover assembly, a battery and an energy storage device. The lower plastic comprises a lower plastic body and a second lower plastic body, the first lower plastic body comprises a first lower plastic body and a first limiting part, the first limiting part is connected to one end of the first lower plastic body in the length direction, the second lower plastic body comprises a second lower plastic body and a second limiting part, the second limiting part is connected to one end of the second lower plastic body in the length direction, the length of the first lower plastic body is larger than that of the second lower plastic body, and the first limiting part and the second limiting part are arranged in a lamination mode. The lower plastic provided by the utility model can solve the technical problems that the lower plastic is high in processing difficulty, easy to shrink and bend and warp, and the assembly efficiency and the safety performance of the battery are affected.

Description

Lower plastic, end cover assembly, battery and energy storage device

Technical Field

The utility model relates to the technical field of batteries, in particular to a lower plastic, an end cover assembly, a battery and an energy storage device.

Background

The chargeable and dischargeable battery has the advantages of high energy density, high power density, multiple recycling times, long storage time and the like, and has wide application in the fields of electric automobiles, mobile equipment and the like.

The lower plastic is an important structure for avoiding the internal short circuit of the battery. In order to meet the structural design requirement of a large-size battery, the battery end cover and the lower plastic are inevitably required to be enlarged, but in the prior art, the molding processing difficulty of the lower plastic with larger size is high, shrinkage and bending warping are easy, so that the assembly of the battery end cover components such as the lower plastic and a pole is difficult, the insulation effect between the lower plastic and the end cover is even influenced, and the assembly efficiency and the safety performance of the battery are greatly influenced.

Disclosure of Invention

The utility model provides a lower plastic, an end cover assembly, a battery and an energy storage device, which are used for solving the technical problems that the lower plastic in the prior art is high in molding and processing difficulty, easy to shrink and bend and warp, difficult to assemble and poor in insulating effect, and the assembly efficiency and the safety performance of the battery are greatly influenced.

In order to solve the above problems, in a first aspect, the present utility model provides a lower plastic, comprising:

the lower plastic and the second lower plastic, the first lower plastic includes first plastic body and first spacing portion, and first spacing portion connects in first lower plastic body length direction's one end, and the second lower plastic includes second lower plastic body and second spacing portion, and second spacing portion connects in second lower plastic body length direction's one end, and first lower plastic's length is greater than second lower plastic's length, and first spacing portion and second spacing portion range upon range of setting.

Through divide into two parts of plastic under first and the second, plastic shaping processing degree of difficulty is high under having solved among the prior art integral type, and shrink easily and crooked perk, leads to the difficult and poor problem of insulating effect of part assembly such as plastic and utmost point post down, has improved assembly efficiency and security performance of battery greatly. Meanwhile, through the mode that the first limiting part and the second limiting part are arranged in a laminated mode, reliable connection of the first lower plastic body and the second lower plastic body is achieved, overall flatness and structural strength of the lower plastic are guaranteed, and therefore good insulating effect of the lower plastic between the battery cell and the end cover is guaranteed.

In one possible implementation manner, the upper surface of the first limiting part is coplanar with the upper surface of the first lower plastic body, the lower surface of the second limiting part is coplanar with the lower surface of the second lower plastic body, the lower surface of the first limiting part is connected with the upper surface of the second limiting part, and the sum of the thicknesses of the first limiting part and the second limiting part accounts for 85% -100% of the thickness of the lower plastic. Illustratively, the sum of the thicknesses of the first and second spacing portions is 85% -95% of the thickness of the lower plastic. After the first lower plastic body is assembled with the first pole and the second lower plastic body is assembled with the second pole, one end of the first lower plastic body, provided with the first limiting part, is naturally and downwards deflected under the action of gravity, and the limiting part is easily protruded in the direction deviating from the end cover. Through setting up the thickness of spacing portion overall thickness and being less than the thickness of plastic down, can reduce the protrusion volume of spacing portion, guarantee the holistic planarization of plastic down to guarantee that the plastic plays good insulating effect down between electric core and end cover.

In one possible embodiment, the thickness of the second limiting portion is greater than or equal to the thickness of the first limiting portion. The thickness of the second limiting portion is greater than the thickness of the first limiting portion. The thickness of the second limiting part can be 45% -60% of the thickness of the lower plastic, and the thickness of the first limiting part can be 30% -40% of the thickness of the lower plastic. Through setting up the thickness of second spacing portion and being greater than the thickness of first spacing portion, can reduce the pressure of first plastic gravity to the second plastic down, further improve the effect of accepting of second spacing portion to first spacing portion.

In one possible embodiment, the first limiting portion and the second lower plastic body have a first gap along the length direction of the lower plastic, and/or the second limiting portion and the first lower plastic body have a second gap. Illustratively, the first gap between the first limiting portion and the second lower plastic body is 1 mm-2 mm, and the second gap between the second limiting portion and the first lower plastic body is 1 mm-2 mm. On lower plastic length direction, through reserving first clearance between the lateral wall face of first spacing portion and the lateral wall face of plastic body under the second, and/or, reserve the second clearance between the lateral wall face of second spacing portion and the lateral wall face of first plastic body under, when guaranteeing first spacing portion and second spacing portion connection effect, can reserve certain assembly tolerance to offset spacing portion injection moulding error or the assembly error of plastic and utmost point post assembly down, thereby reduce the assembly degree of difficulty of plastic down and avoid plastic bending to warp down.

In one possible implementation manner, the upper surface of the second limiting portion is further provided with a supporting portion, the lower surface of the first limiting portion is provided with a concave portion, and at least part of the supporting portion is located in the concave portion. In one possible implementation manner, the recess portion is a first blind hole concavely formed in the lower surface of the first limiting portion, or the recess portion is a first through hole penetrating through the upper surface of the first limiting portion and the lower surface of the first limiting portion. Through setting up supporting part at the spacing portion of second, set up at first spacing portion with it corresponding complex first blind hole or first through-hole, can further strengthen the joint strength of spacing portion of second and first spacing portion to guarantee holistic structural strength and insulating properties of plastic down.

In a second aspect, the present utility model provides an end cap assembly, including a pole, an end cap, and the lower plastic, where the end cap and the lower plastic are stacked.

In a possible implementation manner, the first limiting portion is provided with a first through hole penetrating through the lower surface of the first limiting portion, the upper surface of the second limiting portion is provided with a supporting portion, one side of the end cover facing the downward plastic is provided with a second blind hole corresponding to the first through hole, and the supporting portion penetrates through the first through hole and is connected with the second blind hole. The end cover is further provided with a second blind hole, one end of the supporting part is connected with the upper surface of the second limiting part, and after the supporting part passes through the first through hole, the other end of the supporting part is connected with the second blind hole of the end cover. Therefore, the connection of the second lower plastic-first lower plastic-end cover three can be realized, the downward deflection degree of the limiting part affected by gravity is reduced, the lower plastic is fixed with the pole and the end cover at both ends, the matched fixing points with the end cover are also arranged at the limiting part, the connection strength and the flatness of the lower plastic limiting part are improved, and the overall structural strength and the insulation performance of the lower plastic are ensured.

In one possible implementation manner, the first lower plastic body is provided with a third through hole, and the third through hole end cover is provided with an explosion-proof valve through hole communicated with the third through hole. Through locating the third through hole on the longer first plastic body down, can make the third through hole correspond with the explosion-proof valve through-hole, guarantee the area of seting up of third through hole and the security performance of battery. And through the setting mode that third through-hole and spacing portion have the clearance, can avoid the gas accumulation of battery to cause certain impact to spacing portion when around the third through-hole, influence spacing portion's joint strength.

In one possible implementation manner, the first lower plastic upper body is provided with a second through hole through which liquid flows when the liquid is injected, and the second through hole end cover is provided with a liquid injection through hole communicated with the second through hole. When the liquid is injected, a certain impact force is caused to the lower plastic due to the downward flow of the liquid, and when the lower surface of the first limiting part is connected with the upper surface of the second limiting part, the first lower limiting part can be received by the second limiting part, so that the influence of the downward flow of the liquid on the limiting part is reduced. If the second through hole is arranged on the second lower plastic body, the second limiting part which receives the first limiting part can be separated from the first limiting part under the impact force of the liquid flowing downwards, so that the connection effect of the second limiting part and the first limiting part is affected.

In a third aspect, the present utility model provides a battery comprising at least one end cap assembly as described above.

In a fourth aspect, the present utility model provides an energy storage device comprising at least one battery as described above.

In summary, through dividing the plastic into two parts of first lower plastic and second lower plastic, the problem that the plastic is difficult to assemble and poor in insulating effect due to the fact that the plastic is easy to shrink and bend and warp due to the fact that the plastic is high in molding processing difficulty of the integrated lower plastic in the prior art is solved, and the assembly efficiency and the safety performance of the battery are greatly improved. Meanwhile, through the mode that the first limiting part and the second limiting part are arranged in a laminated mode, reliable connection of the first lower plastic body and the second lower plastic body is achieved, overall flatness and structural strength of the lower plastic are guaranteed, and therefore good insulating effect of the lower plastic between the battery cell and the end cover is guaranteed.

Drawings

In order to more clearly describe the embodiments of the present utility model or the technical solutions in the background art, the following description will describe the drawings that are required to be used in the embodiments of the present utility model or the background art.

FIG. 1 is a schematic structural diagram of an electric device according to an embodiment of the present utility model;

FIG. 2 is a schematic diagram of an energy storage device in the powered device shown in FIG. 1;

FIG. 3 is a schematic diagram of a battery in the energy storage device of FIG. 2;

FIG. 4 is an exploded view of the battery shown in FIG. 3;

FIG. 5 is a schematic illustration of the structure of the end cap assembly in the cell of FIG. 3;

FIG. 6 is an exploded schematic view of the end cap assembly of FIG. 5;

FIG. 7 is a schematic view of the lower plastic in the end cap assembly of FIG. 5;

FIG. 8 is an exploded view of the lower plastic of FIG. 7;

FIG. 9 is a front view of the lower plastic of FIG. 7;

FIG. 10a is a cross-sectional view of the end cap assembly of FIG. 5;

fig. 10b is an enlarged schematic view of the area outlined by the dotted line in fig. 10 a.

Reference numerals:

the power consumption device 400, the device body 410,

the energy storage device 300, the housing 310,

the battery 200 is provided with a battery,

end cap assembly 100, battery cell 110, housing 120, adaptor tab 130,

lower plastic 10, mounting through hole 11, third through hole 12, second through hole 13, first mounting through hole 11a, second mounting through hole 11b,

a first lower plastic 14, a first lower plastic body 15, a first limiting portion 16, a first through hole 16a, a first gap M,

a second lower plastic 17, a second lower plastic body 18, a second limiting portion 19, a supporting portion 19a, a second gap N,

an end cover 20, a pole through hole 21, an explosion-proof valve through hole 22, a liquid injection through hole 23, a first pole through hole 21a, a second pole through hole 21b, a second blind hole 26,

a pole 30, an end cap 31, a pole body 32, a base 33, a first pole 30a, a second pole 30b,

the sealing ring 40 is provided with a sealing ring,

the explosion-proof valve 50 is provided with a valve,

the upper plastic 60, the fourth through hole 61,

a pressing block 70, a fifth through hole 71.

Detailed Description

Embodiments of the present utility model are described below with reference to the accompanying drawings.

The embodiment of the utility model provides lower plastic, an end cover assembly, a battery, an energy storage device and electric equipment.

Referring to fig. 1, fig. 1 is a schematic structural diagram of an electric device 400 according to an embodiment of the utility model. The electric device 400 includes a device body 410 and an energy storage device 300, and the energy storage device 300 can supply power to each device in the device body 410 that needs to be powered, so as to meet the operation requirement of the electric device 400. The number of energy storage devices 300 may be one or more. When the number of the energy storage devices 300 is plural, the plurality of energy storage devices 300 may be connected in series, or in parallel, or in a mixture of series and parallel to achieve a larger capacity and power.

The electric equipment 400 may be a vehicle or an unmanned plane. Vehicles include, but are not limited to, electric only vehicles (Pure Electric Vehicle/Battery Electric Vehicle, PEV/BEV), hybrid vehicles (Hybrid Electric Vehicle, HEV), range-extended electric vehicles (Range Extended Electric Vehicle, REEV), plug-in hybrid vehicles (Plug-in Hybrid Electric Vehicle, PHEV), or new energy vehicles (New Energy Vehicle).

Referring to fig. 2, fig. 2 is a schematic structural diagram of an electric energy storage device 300 in the powered device 400 shown in fig. 1. The energy storage device 300 includes a housing 310 and a plurality of batteries 200, wherein the plurality of batteries 200 are electrically connected and are all located inside the housing 310, and can be protected from the external environment by the housing 310. In this embodiment, one energy storage device 300 includes a plurality of batteries 200. The plurality of batteries 200 are arranged at intervals. The plurality of batteries 200 may be connected in series, or in parallel, or a mixture of series and parallel to achieve a larger capacity and power.

Referring to fig. 3 and 4, fig. 3 is a schematic structural view of the battery 200 of fig. 2, and fig. 4 is an exploded schematic view of the battery 200 of fig. 3.

Wherein the battery 200 is a secondary battery. Such as nickel-hydrogen batteries, nickel-cadmium batteries, lead-acid (or lead-storage) batteries, lithium-ion batteries, polymer lithium-ion batteries, and the like. In other embodiments, the battery may also be a lithium ion primary battery, a lithium sulfur battery, a sodium lithium ion battery or a sodium ion battery or a magnesium ion battery, or the like.

In this embodiment, the battery 200 is a rectangular parallelepiped. In other embodiments, the battery 200 may also be cylindrical or other shapes. The battery 200 includes an end cap assembly 100, a battery cell 110, a switch 130, and a housing 120, wherein the battery cell 110 is located inside the housing 120, and is protected from the external environment by the housing 120. The connection of the battery cells 110 to the end cap assembly 100 is accomplished by the switch tab 130.

Referring to fig. 5 and 6, fig. 6 is an exploded view of the end cap assembly 100 shown in fig. 5. The end cap assembly 100 includes a pole 30, an end cap 20, an explosion protection valve 50, a lower plastic 10, a seal ring 40, an upper plastic 60, and a pressure block 70.

Referring to fig. 7, 8 and 9, fig. 7 is a schematic structural view of the lower plastic 10 of the end cap assembly 100 shown in fig. 5, fig. 8 is an exploded schematic view of the lower plastic 10 shown in fig. 7, fig. 9 is a front view of the lower plastic 10 shown in fig. 7, fig. 10a is a cross-sectional view of the end cap assembly 100 shown in fig. 5, and fig. 10b is an enlarged schematic view of a broken line frame area shown in fig. 10 a.

The pole 30 includes an end cap 31, a pole body 32 and a base 33, the end cap 31 and the base 33 are respectively located at opposite ends of the pole body 32, one end of the pole body 32 is connected with the base 33, and the other end of the pole body 32 is connected with the end cap 31. The cross-sectional area of the post body 32 is smaller than the cross-sectional area of the base 33, and the cross-sectional area of the post body 32 is smaller than the cross-sectional area of the end cap 31. That is, the projection of the pole body 32 onto the base 33 falls within the base 33, and the projection of the pole body 32 onto the end cap 31 falls within the end cap 31. The cross-sectional area of the end cap 31 is less than or equal to the cross-sectional area of the base 33. Wherein the cross-sectional area is a cross-sectional area taken along a plane parallel to the base 33. Illustratively, the cross-sectional area of the end cap 31 is less than the cross-sectional area of the base 33. In this embodiment, the pole body 32 and the end cap 31 are both cylindrical in shape. The height of the base 33 and the end cap 31 is less than the height of the pole body 32. By providing the base 33 and end cap 31 to be less than the height of the post body 32, the space occupation of the base 33 at the end cap assembly 100 can be reduced, and the volumetric energy density of the battery 200 can be increased. In the end cap assembly 100, the pole 30 includes a first pole 30a and a second pole 30b.

The shape of the end cap 20 may be square or circular or other shape, with the end cap 20 being square in shape, for example. The end cap 20 is provided with a post through hole 21 for passing the post body 32 therethrough, an explosion-proof valve through hole 22 for connecting the explosion-proof valve 50, and a liquid injection through hole 23 for injecting liquid. The post through holes 21 include a first post through hole 21a and a second post through hole 21b. The first pole through hole 21a is used for the first pole 30a to pass through, and the second pole through hole 21b is used for the second pole 30b to pass through. Illustratively, the through-hole area of the post through-hole 21 is greater than the cross-sectional areas of the post body 32 and the end cap 31 and less than the cross-sectional area of the base 33 to limit movement of the post body 32 out of the post through-hole 21 in a direction of the end cap 20 away from the lower plastic 10. Wherein the cross-sectional area is a cross-sectional area taken along a plane parallel to the base 33.

The explosion proof valve 50 is connected to the explosion proof valve through hole 22. The number of explosion proof valves 50 is one or more. The number of explosion proof valves 50 is the same as the number of explosion proof valve through holes 22. In this embodiment, the number of the explosion-proof valves 50 and the number of the explosion-proof valve through holes 22 are one. When the air pressure in the battery 200 reaches a certain threshold, the explosion-proof valve through hole 22 and the explosion-proof valve 50 can provide an exhaust passage for the battery 200, so that the safety performance of the battery 200 is ensured.

The shape of the lower plastic 10 may be square or circular or other shape, and the shape of the lower plastic 10 is the same as the shape of the end cap 20. Illustratively, the shape of the lower plastic 10 and the shape of the end cap 20 are square. The lower plastic 10 is laminated with the end cap 20. The lower plastic 10 is provided with a mounting through hole 11 for passing the pole 30, a third through hole 12 communicated with the explosion-proof valve through hole 22 and a second through hole 13 communicated with the liquid injection through hole 23. Wherein the mounting through holes 11 include a first mounting through hole 11a and a second mounting through hole 11b. The first mounting through hole 11a is provided in communication with the first pole through hole 21a, and the first mounting through hole 11a is provided for the first pole 30a to pass through. The second mounting through hole 11b is provided in communication with the second post through hole 21b, and the second mounting through hole 11b is provided for the second post 30b to pass through. Illustratively, the through-hole area of the mounting through-hole 11 is greater than the cross-sectional areas of the post body 32 and the end cap 31 and less than the cross-sectional area of the base 33 to limit movement of the post body 32 out of the mounting through-hole 11 in the direction of the lower plastic 10 toward the end cap 20. Wherein the cross-sectional area is a cross-sectional area taken along a plane parallel to the base 33.

In this embodiment, the lower plastic 10 includes a first lower plastic 14 and a second lower plastic 17.

The first lower plastic 14 includes a first lower plastic body 15 and a first limiting portion 16. The first lower plastic body 15 is provided with a first mounting through hole 11a for the first pole 30a to pass through, and the first limiting portion 16 is connected to one end of the first lower plastic body 15 far away from the first mounting through hole 11 a. The second lower plastic 17 includes a second lower plastic body 18 and a second limiting portion 19. The second lower plastic body 18 is provided with a second mounting through hole 11b for the second post 30b to pass through, and the second limiting portion 19 is connected to one end of the second lower plastic body 18 away from the second mounting through hole 11b. The first limit portion 16 and the second limit portion 19 may be collectively referred to as limit portions of the lower plastic 10.

After the first lower plastic body 15 is assembled with the first pole 30a, the pole body 32 of the first pole 30a may pass through the first mounting hole 11a, the base 33 of the first pole 30a is located at a side of the first lower plastic body 15 facing away from the end cap 20, and the first pole 30a may fix one end of the first lower plastic 14 through the first mounting hole 11 a. After the second lower plastic body 18 is assembled with the second post 30b, the post body 32 of the second post 30b may pass through the second mounting through hole 11b, the base 33 of the second post 30b is located on the side of the second lower plastic body 18 facing away from the end cap 20, and the second post 30b may fix one end of the second lower plastic 17 through the second mounting through hole 11b. The other end of the first lower plastic 14 and the other end of the second lower plastic 17 are connected with the first lower plastic 14 and the second lower plastic 17 through the limiting part.

The length of the first lower plastic 14 is greater than or equal to the length of the second lower plastic 17. Illustratively, the length of the first lower plastic 14 is greater than the length of the second lower plastic 17. That is, in the length direction of the lower plastic 10, the limiting portion is located at one side of the center line of the lower plastic 10. In the cell structure design, the explosion-proof valve through hole 22 is generally located at a center line position in the length direction of the end cap 20 in consideration of the timely release of the air pressure in the battery 200. When the length of the first lower plastic 14 is greater than that of the second lower plastic 17, the third through hole 12 communicating with the explosion-proof valve through hole 22 can be arranged on the first lower plastic body 15, and the third through hole 12 and the limiting part have a gap. By arranging the third through hole 12 on the longer first lower plastic body 15, the third through hole 12 corresponds to the explosion-proof valve through hole 22, and the opening area of the third through hole 12 and the safety performance of the battery 200 are ensured. And the third through hole 12 and the limiting part are provided with gaps, so that certain impact on the limiting part when the gas of the battery 200 gathers around the third through hole 12 can be avoided, and the connection strength of the limiting part is influenced.

The first stopper 16 and the second stopper 19 are stacked. When the first limiting portion 16 is connected to the second limiting portion 19, the lower surface of the first limiting portion 16 may be connected to the upper surface of the second limiting portion 19, or the upper surface of the first limiting portion 16 may be connected to the lower surface of the second limiting portion 19. That is, when the first stopper 16 is connected to the second stopper 19, the first stopper 16 may overlap the second stopper 19, or the second stopper 19 may overlap the first stopper 16. Illustratively, when the first limiting portion 16 is connected to the second limiting portion 19, the lower surface of the first limiting portion 16 is connected to the upper surface of the second limiting portion 19.

When the length of the first lower plastic 14 is greater than that of the second lower plastic 17, the first lower plastic body 15 is fixed at the end provided with the first mounting through hole 11a under the action of the matching positioning force of the first mounting through hole 11a and the first pole 30 a. However, the other end of the first lower plastic body 15 far away from the first mounting through hole 11a naturally and downwardly deflects due to self gravity, i.e. the end of the first lower plastic body 15 far away from the first mounting through hole 11a is not in the same plane with the end of the first lower plastic body 15 provided with the first mounting through hole 11 a.

When the upper surface of the first limiting portion 16 is connected with the lower surface of the second limiting portion 19, the first limiting portion 16 receives the second limiting portion 19. In addition, the first lower plastic body 15 has its own weight, and the downward offset degree of the end of the first lower plastic body 15 away from the first mounting through hole 11a is further increased. When the first lower plastic body 15 is far away from the offset degree of the end of the first mounting through hole 11a, which is greater than the offset degree of the end of the second lower plastic body 18 far away from the second mounting through hole 11b, the lower plastic 10 may protrude in the direction away from the end cover 20 at the limiting portion, and the contact area between the upper surface of the first limiting portion 16 and the lower surface of the second limiting portion 19 may be reduced, so as to affect the connection effect of the first limiting portion 16 and the second limiting portion 19. Here, the offset refers to an offset of an end of the first lower plastic body 15 away from the first mounting through hole 11a relative to a plane in which the first mounting through hole 11a is located, or an offset of an end of the second lower plastic body 18 away from the second mounting through hole 11b relative to a plane in which the second mounting through hole 11b is located.

When the lower surface of the first limiting portion 16 is connected with the upper surface of the second limiting portion 19, the second limiting portion 19 receives the first limiting portion 16. Under the action of gravity, the lower surface of the first limiting part 16 can naturally overlap the upper surface of the second limiting part 19. Compared with the first lower plastic body 15, the distance between the end of the second lower plastic body 18 far away from the second mounting through hole 11b and the second mounting through hole 11b is shorter, so that the acting force of the second lower plastic body 18 for being matched and positioned by the second mounting through hole 11b and the second post 30b is larger. The greater the positioning force, the less it will deflect downward under the force of gravity. Therefore, the shorter second lower plastic body 18 has better supporting force for the longer first lower plastic body 15. Through the mode that the lower surface of first spacing portion 16 is connected with the upper surface of second spacing portion 19, not only realize the connection of plastic body 15 under first and the plastic body 18 under the second, also guaranteed the holistic planarization of plastic 10 down to guarantee that plastic 10 plays good insulating effect down between electric core 110 and end cover 20.

In one possible embodiment, the thickness of the first lower plastic body 15 is less than or equal to the thickness of the second lower plastic body 18. Illustratively, the thickness of the first lower plastic body 15 is equal to the thickness of the second lower plastic body 18. When the thickness of the first lower plastic body 15 is equal to the thickness of the second lower plastic body 18, the thickness of the first lower plastic body 15 or the thickness of the second lower plastic body 18 is the thickness of the lower plastic 10. The thickness of the first limiting portion 16 and the thickness of the second limiting portion 19 are smaller than the thickness of the lower plastic 10. The upper surface of the first limiting part 16 is coplanar with the upper surface of the first lower plastic body 15, the lower surface of the second limiting part 19 is coplanar with the lower surface of the second lower plastic body 18, the lower surface of the first limiting part 16 is connected with the upper surface of the second limiting part 19, the sum of the thicknesses of the first limiting part 16 and the second limiting part 19 accounts for 85% -100% of the thickness of the lower plastic 10, namely, the total thickness of the limiting parts accounts for 85% -100% of the thickness of the lower plastic 10. Illustratively, the sum of the thicknesses of the first and second spacing portions 16, 19 is 85% -95% of the thickness of the lower plastic 10. After the first lower plastic body 15 is assembled with the first pole 30a and the second lower plastic body 18 is assembled with the second pole 30b, the end of the first lower plastic body 15 provided with the first limiting portion 16 is naturally biased downward under the action of gravity, so that the limiting portion is easily protruded in a direction away from the end cover 20. Through setting up the thickness of spacing portion overall thickness and being less than the thickness of plastic 10 down, can reduce the protrusion volume of spacing portion, guarantee the holistic planarization of plastic 10 down to guarantee that plastic 10 plays good insulating effect down between electric core 110 and end cover 20.

Further, the thickness of the second limiting portion 19 is greater than or equal to the thickness of the first limiting portion 16. Illustratively, the thickness of the second spacing portion 19 is greater than the thickness of the first spacing portion 16. The thickness of the second limiting part 19 can be 45% -60% of the thickness of the lower plastic 10, and the thickness of the first limiting part 16 can be 30% -40% of the thickness of the lower plastic 10. By setting the thickness of the second limiting portion 19 to be greater than that of the first limiting portion 16, the pressure of the gravity of the first lower plastic 14 to the second lower plastic 17 can be reduced, and the receiving effect of the second limiting portion 19 to the first limiting portion 16 can be further improved.

In the embodiment of the utility model, the lower plastic 10 is provided with a second through hole 13 communicated with the liquid injection through hole 23. The second through hole 13 may be disposed on the first lower plastic body 15 or may be disposed on the second lower plastic body 18. Illustratively, the second through hole 13 is disposed on the first lower plastic body 15. When the liquid is injected, a certain impact force is caused to the lower plastic 10 due to the downward flow of the liquid, and when the lower surface of the first limiting part 16 is connected with the upper surface of the second limiting part 19, the first lower limiting part can be received by the second limiting part 19, so that the influence of the downward flow of the liquid on the limiting part is reduced. If the second through hole 13 is disposed on the second lower plastic body 18, the second limiting portion 19 that receives the first limiting portion 16 may be separated from the first limiting portion 16 under the impact force of the liquid flowing downward, so as to affect the connection effect between the second limiting portion 19 and the first limiting portion 16.

In the present embodiment, the first limiting portion 16 and the second lower plastic body 18 have a first gap M along the length direction of the lower plastic 10, and/or the second limiting portion 19 and the first lower plastic body 15 have a second gap N. Illustratively, the first gap M between the first limiting portion 16 and the second lower plastic body 18 is 1 mm-2 mm, and the second gap N between the second limiting portion 19 and the first lower plastic body 15 is 1 mm-2 mm. In the length direction of the lower plastic 10, a first gap M is reserved between the side wall surface of the first limiting portion 16 and the side wall surface of the second lower plastic body 18, and/or a second gap N is reserved between the side wall surface of the second limiting portion 19 and the side wall surface of the first lower plastic body 15, so that a certain assembly tolerance can be reserved while the connection effect of the first limiting portion 16 and the second limiting portion 19 is ensured, and the injection molding error of the limiting portion or the assembly error of the lower plastic 10 and the pole 30 is counteracted, thereby reducing the assembly difficulty of the lower plastic 10 and avoiding the bending and warping of the lower plastic 10.

Further, along the length direction of the lower plastic 10, the projection length of the first limiting part 16 on the second limiting part 19 is 5 mm-15 mm. The overlapping area and the connecting effect of the first limiting part 16 and the second limiting part 19 are ensured by setting the length of the overlapping area of the first limiting part 16 and the second limiting part 19 to be 5 mm-15 mm. When the length of the overlapping area is less than 5mm, the overlapping length is too short, and the overlapping effect of the first limiting part 16 and the second limiting part 19 is affected; when the length of the overlapping area is greater than 15mm, the length of the limiting part is too long, the lower plastic 10 at the limiting part is easy to bend and warp, and the structural strength and the flatness of the lower plastic 10 are affected.

In this embodiment, the upper surface of the second limiting portion 19 is further provided with a supporting portion 19a, the lower surface of the first limiting portion 16 is provided with a recess portion, and at least part of the supporting portion 19a is located in the recess portion. The number of the supporting parts 19a may be one or more, and the number of the concave parts is the same as the number of the supporting parts 19 a. When the number of the supporting portions 19a is plural, the length of the second limiting portion 19 along the width direction of the lower plastic 10 is L, the number of the supporting portions 19a is n, and the gap between two adjacent supporting portions 19a may be L/(n+1), that is, the plurality of supporting portions 19a are equally spaced on the second limiting portion 19. Illustratively, when the number of the supporting portions 19a is 2, the supporting portions 19a are provided at 1/3 length and 2/3 length of the second stopper portion 19 in the width direction of the lower plastic 10.

In one possible embodiment, the recess may be a first blind hole (not shown) recessed in the lower surface of the first limiting portion 16.

When the recess portion is a first blind hole concavely formed on the lower surface of the first limiting portion 16, the supporting portion 19a is connected with the first blind hole. Through setting up supporting part 19a at second spacing portion 19, set up the first blind hole that corresponds the cooperation with it at first spacing portion 16, can further strengthen the joint strength of second spacing portion 19 and first spacing portion 16 to guarantee lower plastic 10 holistic structural strength and insulating properties.

In another possible embodiment, the recess may be a first through hole 16a penetrating the upper surface of the first stopper 16 and the lower surface of the first stopper 16.

When the recess portion is a first through hole 16a penetrating the upper surface of the first limiting portion 16 and the lower surface of the first limiting portion 16, the first through hole 16a is provided for the supporting portion 19a to pass through, and by providing the supporting portion 19a on the second limiting portion 19 and providing the first through hole 16a corresponding to the first limiting portion 16, the connection strength between the second limiting portion 19 and the first limiting portion 16 can be further enhanced, so that the overall structural strength and insulation performance of the lower plastic 10 are ensured. Further, a second blind hole 26 corresponding to the first through hole 16a is provided at a side of the end cap 20 facing the lower plastic 10. The shape of the second blind hole 26 may be circular, oval, trapezoidal, T-shaped, or other shapes. Referring to fig. 10a and 10b, one end of the supporting portion 19a is connected to the upper surface of the second limiting portion 19, and after the supporting portion 19a passes through the first through hole 16a, the other end of the supporting portion 19a is connected to the second blind hole 26 of the end cap 20. Therefore, the connection of the second lower plastic 17, the first lower plastic 14 and the end cover 20 can be realized, the downward deflection degree of the limiting part affected by gravity is reduced, the lower plastic 10 is fixed with the pole 30 and the end cover 20 at both ends, and the matching fixed points with the end cover 20 are also arranged at the limiting part, so that the connection strength and the flatness of the limiting part of the lower plastic 10 are improved, and the integral structural strength and the insulation performance of the lower plastic 10 are ensured. Illustratively, the depth of the second blind bore 26 may be 20% to 50% of the thickness of the end cap 20. When the depth of the second blind hole 26 is less than 20% of the thickness of the end cap 20, the depth of the second blind hole 26 is too shallow, and the connection effect between the support portion 19a and the second blind hole 26 is poor. When the depth of the second blind hole 26 is greater than 50% of the thickness of the end cap 20, the depth of the second blind hole 26 is too deep, affecting the structural strength and airtight performance of the end cap 20.

In the embodiment of the present utility model, the sealing ring 40 is sleeved on the periphery of the pole body 32, and when the pole body 32 passes through the lower plastic 10, the sealing ring 40 is located between the lower plastic 10 and the end cover 20. By providing the seal ring 40, the sealing of the gap after the assembly of the post through-hole 21 and the post body 32 is achieved, thereby ensuring the insulation between the post 30 and the end cap 20, and also ensuring the sealability of the battery 200.

The upper plastic 60 is located on the side of the end cap 20 facing away from the lower plastic 10. The upper plastic 60 is provided with a fourth through hole 61, the fourth through hole 61 is used for the pole body 32 to pass through, and the fourth through hole 61 is communicated with the first pole through hole 21 a. The upper plastic 60 is used for filling gaps among the end cover 20, the sealing ring 40 and the pole 30, and has the functions of positioning and fixing the pole 30, and meanwhile, the insulation performance between the pole 30 and the end cover 20 is ensured.

The pressing block 70 is located at one side of the upper plastic 60 away from the end cover 20, the pressing block 70 is provided with a fifth through hole 71, the fifth through hole 71 is used for the pole body 32 to pass through, and the fifth through hole 71 is communicated with the fourth through hole 61. Through setting up briquetting 70, can fix utmost point post 30 on the one hand, prevent that utmost point post 30 from receiving external force effect and warp, on the other hand can also increase the welding area of utmost point post 30 and external part, guarantee the welding strength of energy memory 300.

In this embodiment, the lower plastic 10, the end cap 20, the upper plastic 60 and the pressing block 70 are sequentially stacked, and the pole body 32 sequentially passes through the mounting through hole 11 of the lower plastic 10, the pole through hole 21 of the end cap 20, the fourth through hole 61 of the upper plastic 60 and the fifth through hole 71 of the pressing block 70. The base 33 at one end of the terminal body 32 is connected with the adapter piece 130 and the battery cell 110, and the end cap 31 at the other end of the terminal body 32 is connected with the press block 70, thereby forming a connection channel of the battery 200 with an external circuit.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model; the terms "comprising" and "having" and any variations thereof in the description of the utility model and the claims and the description of the drawings above are intended to cover a non-exclusive inclusion.

In the description of embodiments of the present utility model, the technical terms "first," "second," and the like are used merely to distinguish between different objects and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated, a particular order or a primary or secondary relationship. In the description of embodiments of the utility model, the meaning of "plurality" means two or more than two, unless specifically defined otherwise.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the utility model. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.

In the description of the embodiments of the present utility model, the term "and/or" is merely an association relationship describing an association object, and indicates that three relationships may exist, for example, a and/or B may indicate: there are three cases, a, B, a and B simultaneously. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship.

In the description of the embodiments of the present utility model, the orientation or positional relationship indicated by the technical terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. are based on the orientation or positional relationship shown in the drawings, and are merely for convenience of description and simplification of the description, and do not indicate or imply that the apparatus or element referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the embodiments of the present utility model.

In the description of the embodiments of the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured" and the like should be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally formed; or may be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the embodiments of the present utility model will be understood by those of ordinary skill in the art according to specific circumstances.

Finally, it should be noted that the above-mentioned embodiments are merely for illustrating the technical solution of the present utility model and not for limiting the same, and although the present utility model has been described in detail with reference to the above-mentioned preferred embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made to the technical solution of the present utility model without departing from the spirit and scope of the technical solution of the present utility model.

Claims (11)

1. The utility model provides a plastic under, its characterized in that, plastic under includes plastic under first and the second, plastic under first includes plastic body and first spacing portion under, first spacing portion connect in plastic body length direction's one end under first, plastic under the second includes plastic body and second spacing portion under the second, second spacing portion connect in plastic body length direction's one end under the second, first plastic length is greater than plastic length under the second, first spacing portion with the range upon range of setting of second spacing portion.

2. The lower plastic of claim 1, wherein an upper surface of the first limiting portion is coplanar with an upper surface of the first lower plastic body, a lower surface of the second limiting portion is coplanar with a lower surface of the second lower plastic body, the lower surface of the first limiting portion is connected with the upper surface of the second limiting portion, and a sum of thicknesses of the first limiting portion and the second limiting portion accounts for 85% -100% of a thickness of the lower plastic.

3. The lower plastic of claim 2, wherein the thickness of the second limiting portion is greater than or equal to the thickness of the first limiting portion.

4. The lower plastic of claim 1, wherein the first limiting portion and the second lower plastic body have a first gap and/or the second limiting portion and the first lower plastic body have a second gap along the length of the lower plastic.

5. The lower plastic according to claim 2, wherein the upper surface of the second limiting portion is further provided with a supporting portion, the lower surface of the first limiting portion is provided with a concave portion, and at least part of the supporting portion is located in the concave portion.

6. The lower plastic of claim 5, wherein the recess is a first blind hole concavely formed in a lower surface of the first limiting portion, or the recess is a first through hole penetrating through an upper surface of the first limiting portion and a lower surface of the first limiting portion.

7. An end cap assembly comprising a pole, an end cap and the lower plastic of any one of claims 1-6, the end cap being laminated with the lower plastic.

8. The end cap assembly of claim 7, wherein the first limiting portion is provided with a first through hole penetrating through an upper surface of the first limiting portion and a lower surface of the first limiting portion, the upper surface of the second limiting portion is provided with a supporting portion, one side of the end cap facing downwards plastic is provided with a second blind hole corresponding to the first through hole, and the supporting portion penetrates through the first through hole and is connected with the second blind hole.

9. The end cap assembly of claim 8, wherein the first lower plastic upper body is provided with a second through hole through which liquid flows during liquid injection, and the end cap is provided with a liquid injection through hole communicated with the second through hole.

10. A battery comprising the end cap assembly of any one of claims 7-9.

11. An energy storage device comprising at least one battery according to claim 10.