CN215680801U

CN215680801U - Battery and power consumption device containing same

Info

Publication number: CN215680801U
Application number: CN202120858281.XU
Authority: CN
Inventors: 余志�; 曹琳; 乐红春; 王传宝; 杨山; 陈杰; 李载波
Original assignee: Dongguan Liwinon Energy Technology Co ltd
Current assignee: Dongguan Liwinon Energy Technology Co ltd
Priority date: 2021-04-25
Filing date: 2021-04-25
Publication date: 2022-01-28
Anticipated expiration: 2031-04-25

Abstract

The utility model provides a battery, which comprises a battery core and a battery shell; the battery shell comprises a shell wall and a cavity; the cavity is used for accommodating the battery core; the shell wall is provided with a pole which is compounded with the shell wall through an insulating material, and the insulating material is positioned on the inner side of the shell wall. Compared with the prior art, the battery provided by the utility model has the advantages that the pole is compounded with the shell wall of the battery shell through the insulating material, and the insulating material is combined with the shell wall through intermolecular force, so that the pole becomes a part of the shell wall and is tightly embedded in the shell wall, therefore, the pole and the battery shell have good sealing performance and excellent insulating effect, meanwhile, the thickness of the pole of the structure can be very thin, the battery does not occupy the height space additionally, and the height utilization rate of the battery is effectively improved.

Description

Battery and power consumption device containing same

Technical Field

The utility model relates to the field of lithium batteries, in particular to a battery and an electric device comprising the battery.

Background

The existing button steel shell battery generally comprises a shell, a cover plate, a battery core and the like. The battery cell is located inside the shell, the cover plate is located at an opening at the upper end of the shell, a pole column penetrates through the cover plate, and the pole column is electrically connected with the battery cell to achieve external power supply. At present, the cover plate and the shell are generally sealed by adopting mechanical seal, the cover plate and the shell are sealed by matching and riveting in deformation, but the mechanical seal has high requirement on the dimensional precision of a sealing part, so that the shell and the cover plate are manufactured and processed with certain difficulty, meanwhile, the sealing reliability of the mechanical seal is poor, the situation of liquid leakage is easy to occur, and the battery is scrapped. In addition, for the sealing of utmost point post and apron, adopt the mode similar to the riveting usually in the conventionality, adopt the plastic seal circle to seal between utmost point post and apron, through exerting pressure to the utmost point post and warping, extrude the sealing washer for utmost point post and apron are sealed, but this kind of sealed mode still has following shortcoming: 1) the reliability is still not high, and the risk of liquid leakage exists; 2) the pole occupies more height space, the thickness of the battery is increased, and the loss of energy density is caused.

In view of the above, it is necessary to provide a technical solution to the above problems.

SUMMERY OF THE UTILITY MODEL

One of the objects of the present invention is: the utility model provides a battery, which solves the problems of low sealing performance and more occupied height space in the design of a pole column in the prior art.

In order to achieve the purpose, the utility model adopts the following technical scheme:

a battery, comprising:

an electric core;

a battery case including a case wall and a cavity; the cavity is used for accommodating the battery core; the shell wall is provided with a pole which is compounded with the shell wall through an insulating material, and the insulating material is positioned on the inner side of the shell wall.

Preferably, the insulating material comprises any one of polypropylene glue, fluororubber, chloroprene rubber, brominated butyl, polyethylene, polyester compound, anti-electrolyte oxidation glue, ethylene propylene, butyl and curing glue.

Preferably, the method for compounding the pole on the shell wall by the insulating material comprises any one of injection molding, glue bonding, hot press bonding, ultrasonic welding, heat curing and ultraviolet curing.

Preferably, the thickness of the pole is the same as that of a shell wall compounded by the pole, and one surface of the pole facing the battery cell is flush with the inner wall of the shell wall.

Preferably, the shell wall is composed of a first shell and a second shell, the first shell and the second shell are in fit sealing connection, and the pole is compounded with the first shell or the second shell through the insulating material.

Preferably, the sealing connection between the first housing and the second housing includes any one of laser welding, thermal compression bonding, resistance welding, and ultrasonic welding.

Preferably, an inner boss is arranged at an end of the first shell and/or the second shell, and the first shell and the second shell are in fit sealing connection through the inner boss.

Preferably, an outer boss is arranged at the end part of the first shell and/or the second shell, and the first shell and the second shell are in matched sealing connection through the outer boss.

Preferably, the first case or the second case is provided with a liquid inlet for injecting the electrolyte.

Preferably, the inner wall of the first shell and/or the second shell avoids the positions of the insulating material and the pole, and an insulating layer is further sprayed on the inner wall of the first shell and/or the second shell.

Preferably, the shell wall or the pole is provided with an explosion-proof score.

Another object of the present invention is to provide an electric device including the battery.

Compared with the prior art, the utility model has the beneficial effects that: according to the battery provided by the utility model, the pole is compounded with the shell wall of the battery shell through the insulating material, and the insulating material is combined with the shell wall through intermolecular force, so that the pole becomes a part of the shell wall and is tightly embedded in the shell wall, therefore, the pole and the battery shell have good sealing performance and excellent insulating effect, the situation of contact short circuit between a positive pole and a negative pole and the battery shell is avoided, meanwhile, the thickness of the pole of the structure can be very thin, the height space of the battery is not additionally occupied, and the height utilization rate of the battery is effectively improved. Compared with the conventional design of riveting the pole on the battery shell, the pole design effectively solves the problems that the tightness between the pole and the battery shell is not high and the pole occupies more height space.

Drawings

Fig. 1 is a schematic structural view of a battery according to embodiment 1 of the present invention.

Fig. 2 is an exploded view of a battery according to example 1 of the present invention.

Fig. 3 is a schematic front view of a cap plate of a battery according to example 1 of the present invention.

Fig. 4 is a schematic reverse view of the cap plate of the battery according to example 1 of the present invention.

Fig. 5 is a schematic structural view of a battery according to embodiment 2 of the present invention.

Fig. 6 is a schematic structural diagram of a battery according to embodiment 4 of the present invention.

Fig. 7 is an exploded view of a battery according to example 4 of the present invention.

Fig. 8 is a schematic structural diagram of a pole piece in embodiment 4 of the present invention.

Fig. 9 is a schematic front view of a case of a battery according to example 4 of the present invention.

Fig. 10 is a schematic reverse side view of the case of the battery of example 4 of the present invention.

Fig. 11 is a schematic structural view of a battery according to embodiment 6 of the present invention.

Fig. 12 is a schematic view of the first housing and the second housing being connected together.

Fig. 13 is a second schematic view illustrating the first housing and the second housing being connected together.

Fig. 14 is a third schematic view illustrating the first housing and the second housing being connected together.

FIG. 15 is a fourth illustration of the first housing and the second housing being connected together in a matching manner according to the present invention.

FIG. 16 is a fifth schematic view illustrating the first housing and the second housing being connected together.

Fig. 17 is a sixth schematic view of the first housing and the second housing being connected together according to the present invention.

Fig. 18 is a seventh schematic view illustrating the first housing and the second housing being connected together.

Fig. 19 is an eighth schematic view illustrating the first housing and the second housing being connected together.

Fig. 20 is a ninth schematic view illustrating the first housing and the second housing being connected together according to the present invention.

Fig. 21 is a tenth schematic view illustrating the first housing and the second housing being connected together according to the present invention.

Fig. 22 is an eleventh schematic view illustrating the first housing and the second housing being connected together according to the present invention.

Fig. 23 is a twelfth schematic view illustrating the first housing and the second housing being connected together according to the present invention.

FIG. 24 is a thirteenth embodiment of the present invention, illustrating the first housing and the second housing being connected together.

Fig. 25 is a fourteenth schematic diagram illustrating the first housing and the second housing being connected together according to the present invention.

Fig. 26 is a fifteenth schematic view illustrating the first housing and the second housing being connected together according to the present invention.

Fig. 27 is a sixteenth schematic view of the first housing and the second housing being connected together according to the present invention.

Fig. 28 is a seventeenth schematic view illustrating the first housing and the second housing being connected together according to the present invention.

Fig. 29 is an eighteen schematic diagrams of the first housing and the second housing being connected together.

Fig. 30 is a nineteenth schematic view illustrating the first housing and the second housing being connected together according to the present invention.

Fig. 31 is a twenty-first embodiment of the present invention, illustrating the first housing and the second housing being connected together.

Fig. 32 is a twenty-first schematic view illustrating the first housing and the second housing being connected together.

Fig. 33 is a twenty-two schematic views illustrating the first housing and the second housing being connected together.

Fig. 34 is a schematic diagram of twenty-three showing the first housing and the second housing being connected together.

In the figure: 1-electric core; 11-positive plate; 111-positive tab; 12-negative pole piece; 121-negative tab; 13-a separator; 2-shell wall; 21-a first housing; 22-a second housing; 3-pole column; 4-an insulating material; 5-explosion-proof scoring; 6-liquid injection port; 7-insulating layer.

Detailed Description

1. A battery comprises a battery core 1 and a battery shell; the battery shell comprises a shell wall 2 and a cavity; the cavity is used for accommodating the battery core 1; the shell wall 2 is provided with a pole 3, which pole 3 is compounded with the shell wall 2 by means of an insulating material 4, and the insulating material 4 is located inside the shell wall 2.

Wherein, this utmost point post 3 mainly adopts the metal material to make, through the electricity with electric core 1 be connected in order to realize the power supply to the outside, including anodal utmost point post and negative pole utmost point post. When the positive tab 111 of the battery cell 1 is electrically connected with the terminal 3, it is a positive terminal, and the negative tab 121 of the battery cell 1 is directly electrically connected with the other end of the battery case; and when the negative tab 121 of the battery cell 1 is electrically connected with the terminal 3, it is a negative terminal, and the positive tab 111 of the battery cell 1 is directly electrically connected with the other end of the battery case. Utmost point post 3 can set up at the upper wall of conch wall 2, lateral wall or lower wall, can assemble sealed battery case again after utmost point post 3 and battery case compound earlier in actual preparation, and normally of course, before utmost point post 3 is compound in conch wall 2, should be provided with on the conch wall 2 with utmost point post 3 assorted through-hole to supply placing of utmost point post 3, then fix utmost point post 3 through insulating material 4.

The battery core 1 can be made by winding or laminating and comprises a positive plate 11, a negative plate 12 and a diaphragm 13 which is arranged between the positive plate 11 and the negative plate 12. If the battery core 1 is made of laminated sheets, the structure of the pole piece and the diaphragm 13 may be designed according to the structure of the battery core 1, for example, when the battery core 1 is a battery core 1 of a button battery, the pole piece is in a circular design with an empty foil area, and the tab is welded to the empty foil area by ultrasonic welding, wherein the positive tab may be an aluminum tape, the negative tab may be a nickel tape, a copper tape or a copper-plated nickel tape, and the non-welding point of the tab is subjected to an insulation treatment in a manner including, but not limited to, thermal compounding PP glue, pasting insulating gummed paper or coating insulating glue.

The active material layer coated on the positive electrode sheet 11 may be of a chemical formula including, but not limited to, Li_aNi_xCo_yM_zO_2-bN_b(wherein a is more than or equal to 0.95 and less than or equal to 1.2, x>0, y is not less than 0, z is not less than 0, and x + y + z is 1,0 is not less than b is not less than 1, M is selected from one or more of Mn and Al, N is selected from one or more of F, P and S), and the cathode active material is prepared by the following steps ofThe substance may also be a substance including but not limited to LiCoO₂、LiNiO₂、LiVO₂、LiCrO₂、LiMn₂O₄、LiCoMnO₄、Li₂NiMn₃O₈、LiNi_0.5Mn_1.5O₄、LiCoPO₄、LiMnPO₄、LiFePO₄、LiNiPO₄、LiCoFSO₄、CuS₂、FeS₂、MoS₂、NiS、TiS₂And the like. The positive electrode active material may be further modified, and the method of modifying the positive electrode active material is known to those skilled in the art, for example, the positive electrode active material may be modified by coating, doping, and the like, and the material used in the modification may be one or a combination of more of Al, B, P, Zr, Si, Ti, Ge, Sn, Mg, Ce, W, and the like. The positive electrode current collector adopted by the positive electrode sheet 11 is generally a structure or a part for collecting current, and the positive electrode current collector may be any material suitable for being used as a positive electrode current collector of a lithium ion battery in the art, for example, the positive electrode current collector may include, but is not limited to, a metal foil and the like, and more specifically, may include, but is not limited to, an aluminum foil and the like.

The active material layer coated on the negative electrode sheet 12 may be one or more of graphite, soft carbon, hard carbon, carbon fiber, mesocarbon microbeads, silicon-based material, tin-based material, lithium titanate, or other metal capable of forming an alloy with lithium. Wherein, the graphite can be selected from one or more of artificial graphite, natural graphite and modified graphite; the silicon-based material can be one or more selected from simple substance silicon, silicon-oxygen compound, silicon-carbon compound and silicon alloy; the tin-based material can be one or more selected from simple substance tin, tin oxide compound and tin alloy. The negative electrode current collector adopted by the negative electrode sheet 12 is generally a structure or a part for collecting current, and the negative electrode current collector may be any material suitable for being used as a negative electrode current collector of a lithium ion battery in the field, for example, the negative electrode current collector may include, but is not limited to, a metal foil and the like, and more specifically, may include, but is not limited to, a copper foil and the like.

The separator 13 may be any material suitable for the lithium ion battery separator 13 in the art, and for example, may be one or a combination of materials including, but not limited to, polyethylene, polypropylene, polyvinylidene fluoride, aramid, polyethylene terephthalate, polytetrafluoroethylene, polyacrylonitrile, polyimide, polyamide, polyester, natural fiber, and the like.

Further, the insulating material 4 includes any one of polypropylene glue, fluororubber, chloroprene rubber, bromobutyl, polyethylene, polyester compound, anti-electrolyte oxidation glue, ethylene propylene, butyl and curing glue. Adopt the insulating material 4 of gluing type, on the one hand more be favorable to it to compound utmost point post 3 in battery case, on the other hand can also play insulating effect, and the leakproofness is better. The curing glue may be specified as a high temperature curing glue. The insulating material 4 may be another polymer material having an insulating effect.

Further, the way of compounding the pole 3 on the shell wall 2 by the insulating material 4 includes, but is not limited to, any one of injection molding, glue bonding, hot pressing, ultrasonic welding, thermal curing, and ultraviolet curing. The specific compounding mode can be selected according to the adopted insulating material 4, and if curing glue is adopted, heat curing and other modes can be correspondingly adopted.

Further, the thickness of the pole 3 is the same as that of the composite shell wall 2, and one surface of the pole 3 facing the battery cell 1 is flush with the inner wall of the shell wall 2. Because the design is carried out by means of compounding the insulating material 4, the thickness of the pole 3 can be the same as that of the shell wall 2 compounded by the pole 3, namely the pole 3 is embedded in the shell wall 2 and is connected with the shell wall 2 into a whole, compared with the design of the existing riveted pole 3, the design of the utility model is equivalent to the design of only adding a layer of insulating material 4 between the battery shell and the battery core 1, basically equivalent to the fact that the height of the battery is not increased, the height utilization rate of the battery is effectively improved, and therefore the energy density of the battery is provided.

Further, the shell wall 2 is composed of a first shell 21 and a second shell 22, the first shell 21 and the second shell 22 are in fit and sealed connection, and the pole 3 is compounded on the first shell 21 or the second shell 22 through the insulating material 4. The battery case according to the present invention includes a cover plate and a case as conventionally described in the background art, the first case 21 or the second case 22 may be regarded as a conventional cover plate, and the other may be regarded as a case, and the terminal 3 according to the present invention may be disposed in the cover plate or the case, and when disposed in the case, may be disposed in a side wall or a bottom wall of the case.

Further, the sealing connection between the first housing 21 and the second housing 22 includes any one of laser welding, thermal compression bonding, resistance welding, and ultrasonic welding. Preferably, two casings adopt laser welding to seal, and laser welding's welding point is more firm, and the leakproofness is better than comparing in mechanical seal, has avoided the risk of weeping greatly. However, for different structure matching modes, the specific parts of the laser welding are different, and only the laser welding at a specific position can ensure good sealing performance of the two shells, as shown in fig. 12 to 34.

Further, an end portion of the first housing 21 and/or the second housing 222 is provided with an inner boss, and the first housing 21 and the second housing 22 are connected in a fitting and sealing manner through the inner boss. For the structural design of different inner bosses, the laser welding directions which can be adopted are also different, and the sealing structure adopting the inner bosses includes but is not limited to the following specific structures as shown in fig. 12-18:

as shown in fig. 12 to 14, the first housing 21 and/or the second housing 22 are respectively provided with a step gap, and the first housing 21 and the second housing 22 form a complete housing wall, so that the requirement of sealing connection between the two housings can be satisfied.

As shown in fig. 15, the matching position of the first housing 21 and the second housing 22 is a bevel structure, the laser welding direction is aligned with the bevel direction, and the first housing 21 and the second housing 22 form a complete housing wall, so that the requirement of sealing connection between the two housings can be satisfied.

In the structure of fig. 16 to 18, the inner boss is enclosed in the cavity, and the first case 21 and the second case 22 can be sealed to form a structurally complete wall by using a laser welding direction perpendicular to the top.

Further, an outer boss is provided at an end of the first housing 21 and/or the second housing 22, and the first housing 21 and the second housing 22 are in fit and sealed connection through the outer boss. There is also a difference in the direction of laser welding that can be used for different structural designs of the external boss, where the external boss is a boss that protrudes out of the entire shell wall after the first shell 21 and the second shell 22 are sealed to form a closed shell wall, and the structural design of the external boss includes, but is not limited to, as shown in fig. 19 to 34:

as shown in fig. 19 to 23, the end portions of the first casing 21 and/or the second casing 22 are respectively provided with a platform protruding from the wall, the protruding direction of the platform is parallel to the top/bottom surface, and the first casing 21 and the second casing 22 are hermetically connected through the platform protruding from the wall.

As shown in fig. 24 to 26, the end portions of the first casing 21 and/or the second casing 22 are respectively provided with a platform protruding from the wall, the protruding direction of the platform is perpendicular to the top/bottom surface, and is also perpendicular to the top or bottom surface, and the first casing 21 and the second casing 22 are hermetically connected through the platform protruding from the wall.

As shown in fig. 27 to 28, the end portions of the first casing 21 and/or the second casing 22 are respectively provided with a platform protruding from the casing wall, the protruding direction of the platform forms an angle smaller than 90 ° with the top/bottom surface, and the first casing 21 and the second casing 22 are hermetically connected through the platform protruding from the casing wall.

As shown in fig. 28 to 34, the first housing 21 and/or the second housing 22 are sealed by an embedded manner, and are designed in a manner that one housing is wrapped around the opening of the other housing, and the adopted laser welding direction is different according to the embedded specific structure, and after laser welding in a proper direction, the sealing performance of the first housing 21 and the second housing 22 is more excellent than that of the structures shown in fig. 19 to 20.

In addition, no matter the inner boss or the outer boss, the design with the step structure is more beneficial to the matching and positioning of the two shells, and the situation that the two shells are displaced in the sealing process to cause poor sealing performance is avoided, so that the sealing performance is better.

Further, the first case 21 or the second case 22 is provided with a liquid inlet 6 for injecting an electrolyte. And after the liquid is injected, sealing the liquid by using a sealing nail, removing the sealing nail after formation, exhausting the gas, and then welding a stainless steel sheet on the liquid injection hole by adopting laser welding to complete the sealing of the liquid injection port 6. The electrolyte includes an organic solvent, an electrolytic lithium salt, and an additive. Wherein the electrolyte lithium salt may be LiPF used in a high-temperature electrolyte₆And/or LiBOB; or LiBF used in low-temperature electrolyte₄、LiBOB、LiPF₆At least one of; or LiBF used in anti-overcharge electrolyte₄、LiBOB、LiPF₆At least one of, LiTFSI; may also be LiClO₄、LiAsF₆、LiCF₃SO₃、LiN(CF₃SO₂)₂At least one of (1). And the organic solvent may be a cyclic carbonate including PC, EC; or chain carbonates including DFC, DMC, or EMC; and also carboxylic acid esters including MF, MA, EA, MP, etc. And additives include, but are not limited to, film forming additives, conductive additives, flame retardant additives, overcharge prevention additives, control of H in the electrolyte₂At least one of additives of O and HF content, additives for improving low temperature performance, and multifunctional additives.

Further, the position where the inner wall of the first shell 21 and/or the second shell 22 avoids the insulating material 4 and the pole 3 is further coated with an insulating layer 7. The insulating layer 7 can avoid the problem that the insulating layer of the tab is damaged and contacts the stainless steel on the cover plate to cause short circuit. In particular, to reduce the production cost, the insulating layer 7 may be disposed near the tab.

Further, an explosion-proof score 5 is arranged on the shell wall 2 or the pole 3. This explosion-proof nick 5 can specifically adopt the mode of laser to etch out the semicircle at the surface of conch wall or utmost point post 3, as explosion-proof line, because of the intensity decline of this explosion-proof nick 5 department, when the battery appears the safety problem under extreme service condition, can produce a large amount of gas in the battery and lead to the inside pressure surge of battery, and the pressure can break through the explosion-proof nick 5 escape at this place, play the effect of relief valve, prevented the further thermal runaway of battery, guaranteed the safety in utilization of battery. Specifically, the anti-explosion notch 5 may be disposed on an outer wall or an inner wall of the casing wall 2, or may be disposed on a surface of the terminal 3 facing away from the battery cell 1 or a surface facing the battery cell 1.

2. Electric device containing the battery

In order to make the technical solutions and advantages of the present invention clearer, the present invention and its advantages will be described in further detail below with reference to the following detailed description and the accompanying drawings, but the embodiments of the present invention are not limited thereto.

Example 1

As shown in fig. 1 to 4, a battery includes a battery cell 1 and a battery case; the battery shell comprises a shell wall 2 and a cavity; the cavity is used for accommodating the battery core 1; the battery cell 1 is made by winding a positive electrode sheet 11, a separator 13 and a negative electrode sheet 12. The shell wall 2 specifically comprises a first shell 21 and a second shell 22, wherein the first shell 21 is used as a cover plate, the second shell 22 is used as a shell, and the cover plate is in fit and seal connection with the shell through a gap; the pole 3 is a positive pole and is compounded with the cover plate through an insulating material 4, and the insulating material 4 is positioned on the inner side of the cover plate.

The preparation method comprises the following steps:

1) the positive electrode sheet 11, the separator 13 and the negative electrode sheet 12 are wound into a cylindrical winding core, and the positive and negative electrode tabs 121 are respectively led out from the upper end face and the lower end face of the winding core.

2) The positive and negative electrode tabs 121 are respectively an aluminum strip and a copper nickel plating strip, and are welded on the empty foil area of the corresponding pole piece by ultrasonic welding; and (3) carrying out insulation treatment on the aluminum strip and the nickel-plated copper non-welding points, wherein the treatment mode comprises but is not limited to thermal compounding of PP glue, pasting of insulating gummed paper, coating of insulating glue and the like.

3) With anodal utmost point post (utmost point post 3 material can be any one of aluminium, nickel, stainless steel) adopt insulating material 4 and apron complex, wherein the apron adopts the mode spraying plastics to spray one deck thin insulating layer 7 towards electric core 1 the inside (the setting of insulating material 4 and anodal post is avoided in the design of this insulating layer 7), can prevent that the insulating layer 7 damage of anodal ear 111 from contacting the stainless steel on the apron and leading to the situation of short circuit. Meanwhile, a semicircle is etched on one surface of the positive pole column, which is far away from the battery cell 1, by using laser, and the function of a safety valve is achieved.

4) The positive tab 111 of the cylindrical winding core is welded to the positive pole post by ultrasonic or laser, and the negative tab 121 is welded to the inner bottom of the housing by resistance welding or laser welding.

5) The opening end of the shell is provided with a step-type gap, and the shell is matched and sealed with the cover plate in a laser welding mode.

6) Electrolyte is injected through the liquid injection port 6 on the cover plate, the liquid injection port is sealed by a sealing nail, the sealing nail is removed after formation, exhaust is carried out, then a stainless steel sheet is welded on the liquid injection hole by laser welding, and the sealing of the liquid injection port 6 is completed.

7) The preparation of the battery is completed.

Example 2

The difference from example 1 is:

as shown in fig. 5, a battery includes a battery cell 1 and a battery case; the battery shell comprises a shell wall 2 and a cavity; the cavity is used for accommodating the battery core 1; the battery cell 1 is made by winding a positive electrode sheet 11, a separator 13 and a negative electrode sheet 12. The shell wall 2 specifically comprises a first shell 21 and a second shell 22, wherein the first shell 21 is used as a cover plate, the second shell 22 is used as a shell, and the cover plate is in fit and seal connection with the shell through a gap; wherein, utmost point post 3 is anodal utmost point post, and is compound through insulating material 4 and the diapire of casing, and insulating material 4 is located the inboard of casing.

Correspondingly, the composite position of the positive pole column and the shell wall 2 changes along with the change of the composite position; when the pole 3 is compounded with the bottom wall of the shell, the cover plate is only a stainless steel circular sheet without holes.

The rest is the same as embodiment 1, and the description is omitted here.

Example 3

The difference from example 1 is:

a battery comprises a battery core 1 and a battery shell; the battery shell comprises a shell wall 2 and a cavity; the cavity is used for accommodating the battery core 1; the battery cell 1 is made by winding a positive electrode sheet 11, a separator 13 and a negative electrode sheet 12. The shell wall 2 specifically comprises a first shell 21 and a second shell 22, wherein the first shell 21 is used as a cover plate, the second shell 22 is used as a shell, and the cover plate is in fit and seal connection with the shell through a gap; wherein, utmost point post 3 is anodal utmost point post, through insulating material 4 and the lateral wall complex of casing, and insulating material 4 is located the inboard of casing.

Correspondingly, the composite position of the positive pole column and the shell wall 2 changes along with the change of the composite position; when the pole 3 is compounded with the side wall of the shell, the cover plate is only a stainless steel circular sheet without holes.

The rest is the same as embodiment 1, and the description is omitted here.

Example 4

As shown in fig. 6 to 10, a battery includes a battery cell 1 and a battery case; the battery shell comprises a shell wall 2 and a cavity; the cavity is used for accommodating the battery core 1; the battery core 1 is formed by laminating a positive plate 11, a diaphragm 13 and a negative plate 12. The shell wall 2 specifically comprises a first shell 21 and a second shell 22, wherein the first shell 21 is used as a cover plate, the second shell 22 is used as a shell, and the cover plate is in fit and seal connection with the shell through a gap; wherein, utmost point post 3 is anodal utmost point post, and is compound through insulating material 4 and the diapire of casing, and insulating material 4 is located the inboard of casing.

The preparation method comprises the following steps:

1) the positive and negative pole pieces 12 are punched into sectors, the diaphragm 13 is punched into a circle or is made into a bag with the negative pole piece 12, and the positive pole piece 11, the diaphragm 13 and the negative pole piece 12 are stacked into the columnar battery core 1 in a laminating mode.

3) With anodal utmost point post (utmost point post 3 material can be any one of aluminium, nickel, stainless steel) adopt insulating material 4 and apron complex, wherein the apron adopts the mode spraying plastics to spray one deck thin insulating layer 7 towards electric core 1 the inside (the setting of insulating material 4 and anodal post is avoided in the design of this insulating layer 7), can prevent that the insulating layer 7 damage of anodal ear 111 from contacting the stainless steel on the apron and leading to the situation of short circuit. Meanwhile, a semicircle is etched on one surface of the positive pole column facing to the battery core 1 by laser, and the function of a safety valve is achieved.

4) The positive tab 111 of the cylindrical battery cell is welded on the positive pole post by ultrasonic wave or laser, and the negative tab 121 is welded on the inner bottom of the shell by resistance welding or laser welding.

7) The preparation of the battery is completed.

Example 5

The difference from example 4 is:

a battery comprises a battery core 1 and a battery shell; the battery shell comprises a shell wall 2 and a cavity; the cavity is used for accommodating the battery core 1; the battery core 1 is formed by laminating a positive plate 11, a diaphragm 13 and a negative plate 12. The shell wall 2 specifically comprises a first shell 21 and a second shell 22, wherein the first shell 21 is used as a cover plate, the second shell 22 is used as a shell, and the cover plate is in fit and seal connection with the shell through a gap; wherein, utmost point post 3 is anodal utmost point post, through insulating material 4 and the lateral wall complex of casing, and insulating material 4 is located the inboard of casing.

Correspondingly, the compounding position of the positive pole column and the shell wall 2 is changed along with the change of the positive pole column and when the pole column 3 is compounded with the side wall of the shell, the cover plate is only a stainless steel circular sheet without holes.

The rest is the same as embodiment 4, and the description is omitted here.

Example 6

The difference from example 4 is:

as shown in fig. 11, a battery includes a battery cell 1 and a battery case; the battery shell comprises a shell wall 2 and a cavity; the cavity is used for accommodating the battery core 1; the battery core 1 is formed by laminating a positive plate 11, a diaphragm 13 and a negative plate 12. The shell wall 2 specifically comprises a first shell 21 and a second shell 22, wherein the first shell 21 is used as a cover plate, the second shell 22 is used as a shell, and the cover plate is in fit and seal connection with the shell through a gap; the pole 3 is a positive pole and is compounded with the cover plate through an insulating material 4, and the insulating material 4 is positioned on the inner side of the cover plate.

Correspondingly, the compounding position of the positive pole column and the shell wall 2 is changed along with the change of the positive pole column and when the pole column 3 is compounded with the shell, the cover plate is only correspondingly a stainless steel disc without holes.

The rest is the same as embodiment 4, and the description is omitted here.

Example 7

An electric device comprising the battery according to any one of embodiments 1 to 6.

Variations and modifications to the above-described embodiments may also occur to those skilled in the art, which fall within the scope of the utility model as disclosed and taught herein. Therefore, the present invention is not limited to the above-mentioned embodiments, and any obvious improvement, replacement or modification made by those skilled in the art based on the present invention is within the protection scope of the present invention. Furthermore, although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.

Claims

1. A battery, comprising:

an electric core;

2. The battery of claim 1, wherein the insulating material is any one of polypropylene glue, fluorine rubber, neoprene, bromobutyl, polyethylene, polyester compound, anti-electrolyte oxidation glue, ethylene propylene, butyl, curing glue.

3. The battery according to claim 2, wherein the insulating material is used for compounding the pole on the shell wall in a manner of any one of injection molding, glue bonding, hot pressing, ultrasonic welding, thermal curing and ultraviolet curing.

4. The battery of claim 3, wherein the pole has the same thickness as that of a shell wall compounded with the pole, and a surface of the pole facing the battery cell is flush with an inner wall of the shell wall.

5. The battery according to any one of claims 1 to 4, wherein the shell wall is composed of a first shell and a second shell, the first shell and the second shell are in fit sealing connection, and the pole is compounded on the first shell or the second shell through the insulating material.

6. The battery of claim 5, wherein the sealing connection of the first housing to the second housing comprises any one of laser welding, thermal compression bonding, resistance welding, and ultrasonic welding.

7. The battery of claim 6, wherein an end of the first housing and/or the second housing is provided with an internal boss, and the first housing and the second housing are in fit-sealing connection through the internal boss.

8. The battery of claim 6, wherein the end of the first housing and/or the second housing is provided with an external boss, and the first housing and the second housing are in fit sealing connection through the external boss.

9. The battery of claim 5, wherein the inner wall of the first shell and/or the second shell is further coated with an insulating layer at a position avoiding the insulating material and the pole.

10. The battery according to any one of claims 1 to 4, wherein the shell wall or the terminal is provided with an explosion-proof score.

11. An electric device comprising the battery according to any one of claims 1 to 9.