阅读说明：本技术 电池封装结构及电池 (Battery packaging structure and battery ) 是由 章辉 彭宁 于 2021-09-08 设计创作，主要内容包括：本发明提供了一种电池封装结构及电池,涉及锂电池技术领域,以解决相关技术中在对电芯组进行包装时,电池的强度较低、抗压能力较差的问题。该电池封装结构包括壳体和盖体,壳体包括相互连接的底壁与侧壁,盖体盖设在侧壁的顶端,底壁、侧壁以及盖体围成容置腔,容置腔用于容置电芯组；侧壁的顶端具有第一连接面,盖体的靠近壳体的一侧具有第二连接面,第一连接面与第二连接面抵接并形成焊缝,焊缝通过激光焊接或者PP胶粘接。本发明提供的电池封装结构及电池,不仅有利于保证电池的质量和密封性,从而提高电池的能量密度,而且有利于在焊接时准确定位。(The invention provides a battery packaging structure and a battery, relates to the technical field of lithium batteries, and aims to solve the problems of low strength and poor pressure resistance of the battery when a battery core group is packaged in the related technology. The battery packaging structure comprises a shell and a cover body, wherein the shell comprises a bottom wall and a side wall which are mutually connected, the cover body covers the top end of the side wall, the bottom wall, the side wall and the cover body enclose an accommodating cavity, and the accommodating cavity is used for accommodating an electric core group; the top of lateral wall has first connection face, and the lid has the second to be connected the face near one side of casing, and first connection face is connected the face butt with the second and is formed the welding seam, and the welding seam passes through laser welding or PP and glues the bonding. The battery packaging structure and the battery provided by the invention are not only beneficial to ensuring the quality and the sealing property of the battery so as to improve the energy density of the battery, but also beneficial to accurate positioning during welding.)

1. A battery packaging structure is characterized by comprising a shell and a cover body, wherein the shell comprises a bottom wall and a side wall which are mutually connected, the cover body is covered at the top end of the side wall, the bottom wall, the side wall and the cover body enclose an accommodating cavity, and the accommodating cavity is used for accommodating a cell group;

the top end of the side wall is provided with a first connecting surface, one side of the cover body, which is close to the shell, is provided with a second connecting surface, the first connecting surface is abutted against the second connecting surface to form a welding line, and the welding line is bonded by laser welding or PP glue.

2. The battery packaging structure according to claim 1, wherein a top end of the side wall of the housing is provided with a first step portion, the first step portion has a first step surface, a side surface of the first step surface close to the cover forms the first connection surface, the cover is provided with an extension portion, and a side surface of the extension portion close to the housing forms the second connection surface.

3. The battery packaging structure according to claim 2, wherein one end of the first step portion is connected to the end of the extending portion through a straight segment, and the other end of the first step portion is connected to the side wall of the housing through an arc transition;

one side surface of the straight line section close to the end part of the extension part forms the first connecting surface, and one side surface of the end part of the extension part close to the straight line section forms the second connecting surface.

4. The battery packaging structure according to claim 1, wherein a flange is disposed at a top end of the side wall of the housing, and the flange covers an end of the cover.

5. The battery packaging structure according to claim 1, wherein the end of the cover is provided with a second step portion having a second step surface, and a side of the second step surface close to the case forms the second connection surface;

the side wall of the housing is embedded in the second stepped portion.

6. The battery packaging structure of claim 5, wherein the height of the second step portion is less than the height of the cover.

7. The battery packaging structure according to any one of claims 1 to 6, wherein the plurality of welding seams are located at different positions where the first connecting surface abuts against the second connecting surface, and the welding seams at different positions are bonded by laser welding or PP glue.

8. A battery, comprising a battery pack and the battery packaging structure of any one of claims 1-7, wherein the battery pack is located in the accommodating cavity of the battery packaging structure, and the battery pack comprises a positive tab and a negative tab;

the side wall of the shell of the battery packaging structure is provided with a first welding area and a second welding area, one of the first welding area and the second welding area is connected with the positive pole lug, and the other of the first welding area and the second welding area is connected with the negative pole lug.

9. The battery of claim 8, further comprising a stiffener disposed on a sidewall of the housing;

the reinforcing piece is arranged corresponding to the first welding area;

and/or the reinforcing piece is arranged corresponding to the second welding area.

10. The battery of claim 9, wherein the side wall of the case is provided with a liquid injection hole communicating the accommodation chamber and the outside for injecting the electrolyte into the accommodation chamber.

Technical Field

The invention relates to the technical field of lithium batteries, in particular to a battery packaging structure and a battery.

Background

A battery refers to a device that converts chemical energy into electrical energy in a portion of the space of a cup, tank, or other container or composite container that holds an electrolyte solution and metal electrodes to produce an electric current, the battery having a positive electrode and a negative electrode.

With the advancement of technology, batteries generally refer to small devices capable of generating electric energy, such as solar cells. The battery generally comprises a battery core pack and a casing for packaging the battery core pack, wherein the existing casing is generally made of an aluminum plastic film or a steel shell.

However, when the electric core group is packaged by using the aluminum-plastic film, on one hand, the strength of the battery is low, and the pressure resistance is poor, and on the other hand, the packaging bag is easy to leak liquid, so that higher potential safety hazard exists; when the steel shell is used for packaging the electric core group, the positioning is not accurate enough during welding.

Disclosure of Invention

In order to solve at least one problem mentioned in the background art, embodiments of the present application provide a battery packaging structure and a battery, which adopt various structures to realize assembly between a case and a cover body, and perform laser welding or PP glue bonding on a weld joint from multiple directions, thereby being beneficial to ensuring the quality and the sealing performance of the battery on the one hand, and improving the energy density of the battery; on the other hand, the positioning problem between the shell and the cover body is favorably improved, and the assembling accuracy is improved.

In order to achieve the above object, in a first aspect, the present invention provides a battery packaging structure, which includes a casing and a cover, wherein the casing includes a bottom wall and a side wall that are connected to each other, the cover is covered on a top end of the side wall, the bottom wall, the side wall and the cover enclose an accommodating cavity, and the accommodating cavity is used for accommodating a battery cell set;

the top end of the side wall is provided with a first connecting surface, one side of the cover body, which is close to the shell, is provided with a second connecting surface, the first connecting surface is abutted against the second connecting surface to form a welding line, and the welding line is bonded by laser welding or PP glue.

In the above battery package structure, optionally, a first step portion is disposed at a top end of the side wall of the casing, the first step portion has a first step surface, a side surface of the first step surface close to the cover body forms the first connection surface, the cover body is provided with an extension portion, and a side surface of the extension portion close to the casing forms the second connection surface.

In the above battery package structure, optionally, one end of the first step portion is connected to the end of the extension portion through a straight line segment, and the other end of the first step portion is transitionally connected to the side wall of the housing through an arc segment;

one side surface of the straight line section close to the end part of the extension part forms the first connecting surface, and one side surface of the end part of the extension part close to the straight line section forms the second connecting surface.

In the above battery package structure, optionally, a flange is disposed at a top end of the side wall of the housing, and the flange covers an end of the cover.

In the above battery package structure, optionally, a second step portion is provided at an end of the cover body, the second step portion has a second step surface, and a side of the second step surface close to the housing forms the second connection surface;

the side wall of the housing is embedded in the second stepped portion.

In the above battery package structure, optionally, the height of the second step portion is smaller than the height of the cover.

In the above battery package structure, optionally, the number of the welding seams is multiple, the multiple welding seams are respectively located at different positions where the first connection surface abuts against the second connection surface, and the welding seams at different positions are all bonded by laser welding or PP glue.

In a second aspect, the invention provides a battery, which comprises a battery core group and the battery packaging structure, wherein the battery core group is located in an accommodating cavity of the battery packaging structure, and comprises a positive tab and a negative tab;

the side wall of the shell of the battery packaging structure is provided with a first welding area and a second welding area, one of the first welding area and the second welding area is connected with the positive pole lug, and the other of the first welding area and the second welding area is connected with the negative pole lug.

In the above battery, optionally, a reinforcing member is further included, the reinforcing member being provided on a side wall of the case;

the reinforcing piece is arranged corresponding to the first welding area;

and/or the reinforcing piece is arranged corresponding to the second welding area.

In the above battery, optionally, a liquid injection hole is formed in a side wall of the casing, and the liquid injection hole is communicated with the accommodating cavity and the outside and used for injecting electrolyte into the accommodating cavity.

According to the battery packaging structure and the battery, the assembly between the shell and the cover body is realized by adopting various structures, and the welding seams are subjected to laser welding or PP glue bonding from multiple directions, so that on one hand, the quality and the sealing property of the battery are ensured, and the energy density of the battery is improved; on the other hand, the positioning problem between the shell and the cover body is favorably improved, and the assembling accuracy is improved.

In addition to the technical problems solved by the embodiments of the present invention, the technical features constituting the technical solutions, and the advantages brought by the technical features of the technical solutions, other technical problems that the battery package structure and the battery provided by the embodiments of the present invention can solve, other technical features included in the technical solutions, and advantages brought by the technical features will be further described in detail in the detailed description.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic perspective view of a battery according to an embodiment of the present disclosure;

fig. 2 is a first exploded schematic view of a battery provided in an embodiment of the present application;

fig. 3 is a first cross-sectional view of a battery provided in an embodiment of the present application;

FIG. 4a is an enlarged view of portion I of FIG. 3, showing welding being performed in a first direction;

FIG. 4b is an enlarged view of portion I of FIG. 3, showing welding performed in a second direction;

FIG. 4c is an enlarged view of portion I of FIG. 3, showing welding performed in a third direction;

FIG. 4d is an enlarged view of the case and the cover of part I of FIG. 3;

fig. 5 is a schematic perspective view of a battery according to an embodiment of the present disclosure;

fig. 6 is a second exploded schematic view of a battery provided in an embodiment of the present application;

fig. 7 is a second cross-sectional view of a battery provided in an embodiment of the present application;

FIG. 8a is an enlarged view of portion II of FIG. 7, shown as welded in a first direction;

FIG. 8b is an enlarged view of section II of FIG. 7, showing welding performed in a second direction;

fig. 8c is an enlarged view of the case and the cover of part II of fig. 7 by gluing;

fig. 9 is a schematic perspective view of a battery provided in an embodiment of the present application;

fig. 10 is a third exploded view of a battery according to an embodiment of the present disclosure;

fig. 11 is a third cross-sectional view of a battery provided in an embodiment of the present application;

FIG. 12 is an enlarged view of portion III of FIG. 11, shown welded in a first direction;

FIG. 13 is an enlarged view of portion III of FIG. 11, shown welded in a second orientation;

fig. 14 is an enlarged view of part III of fig. 11, showing welding performed in both the first direction and the second direction.

Description of reference numerals:

100-a battery package structure;

10-a housing;

101-a containing cavity;

11-a bottom wall;

12-a side wall;

121-a first connection face;

122-a first step;

123-flanging;

124-a first weld area;

125-a second weld zone;

126-a reinforcement;

127-liquid injection hole;

20-a cover body;

21-a second connection face;

22-an extension;

221-the end of the extension;

23-a second step;

30-PP glue;

200-a battery;

210-electric core group.

Detailed Description

The battery generally comprises an electric core group and an aluminum-plastic film or a steel shell coated outside the electric core group, and the traditional aluminum-plastic film has lower strength, poorer pressure resistance and easy breakage and leakage, so that the battery has higher potential safety hazard; in the battery with the steel shell structure, the steel shell comprises a positive shell and a negative shell, one of the positive shell and the negative shell is provided with a flange, and the other of the positive shell and the negative shell is welded on the flange to realize the connection of the positive shell and the negative shell, wherein the welding mode is laser welding, however, when the battery with the steel shell structure in the prior art is used, the positioning is not accurate enough during welding.

In order to solve the technical problems, the invention provides a battery packaging structure and a battery, wherein the battery packaging structure comprises a shell and a cover body, the shell comprises a bottom wall and a side wall which are connected with each other, the cover body is covered on the top end of the side wall, the bottom wall, the side wall and the cover body enclose an accommodating cavity, and the accommodating cavity is used for accommodating a battery cell group;

the top of lateral wall has first connection face, and the lid has the second to be connected the face near one side of casing, and first connection face is connected the face butt with the second and is formed the welding seam, and the welding seam passes through laser welding or PP and glues the bonding.

The assembly between the shell and the cover body is realized by adopting various structures, and the welding seams are subjected to laser welding or PP glue bonding from multiple directions, so that on one hand, the quality and the sealing property of the battery are favorably ensured, and the energy density of the battery is improved; on the other hand, the positioning problem between the shell and the cover body is favorably improved, and the assembling accuracy is improved.

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Fig. 1 is a schematic perspective view of a battery according to an embodiment of the present disclosure, fig. 2 is a schematic exploded view of the battery according to the embodiment of the present disclosure, fig. 3 is a first cross-sectional view of the battery according to the embodiment of the present disclosure, fig. 4a is an enlarged schematic view of a portion I in fig. 3, which is welded along a first direction, fig. 4b is an enlarged schematic view of the portion I in fig. 3, which is welded along a second direction, fig. 4c is an enlarged schematic view of the portion I in fig. 3, which is welded along a third direction, and fig. 4d is an enlarged schematic view of a case and a cover in the portion I in fig. 3, which are adhered to each other.

Fig. 5 is a schematic diagram of a second perspective structure of a battery provided in an embodiment of the present application, fig. 6 is a schematic diagram of a second exploded view of the battery provided in the embodiment of the present application, fig. 7 is a second cross-sectional view of the battery provided in the embodiment of the present application, fig. 8a is an enlarged schematic diagram of a portion II in fig. 7 that is welded along a first direction, fig. 8b is an enlarged schematic diagram of the portion II in fig. 7 that is welded along a second direction, and fig. 8c is an enlarged schematic diagram of a case and a cover in the portion II in fig. 7 that are glued together.

Fig. 9 is a schematic perspective view of a battery according to an embodiment of the present invention, fig. 10 is a schematic exploded view of the battery according to the embodiment of the present invention, fig. 11 is a third cross-sectional view of the battery according to the embodiment of the present invention, fig. 12 is an enlarged view of a portion III of fig. 11, which is welded in a first direction, and fig. 13 is an enlarged view of the portion III of fig. 11, which is welded in a second direction; fig. 14 is an enlarged view of part III of fig. 11, showing welding performed in both the first direction and the second direction.

Example one

Referring to fig. 1 to 12, an embodiment of the invention provides a battery packaging structure 100, which may include a casing 10 and a cover 20, wherein the casing 10 includes a bottom wall 11 and a side wall 12 connected to each other, the cover 20 is covered on a top end of the side wall 12, the bottom wall 11, the side wall 12 and the cover 20 define an accommodating cavity 101, and the accommodating cavity 101 is used for accommodating a battery pack 210.

Specifically, the electric core group 210 may be a winding core, and the electric core group 210 may also be a stacked core, wherein in this embodiment, the electric core group 210 is specifically described as an example of a winding core, where the winding core may include an anode plate (not shown in the figure) and a cathode plate (not shown in the figure), the anode tab (not shown in the figure) is welded on the anode plate, and the cathode tab (not shown in the figure) is welded on the cathode plate, where the electric core group 210 may further include structures such as a separator, and other structures included in the electric core group 210 are not described in detail herein.

In this embodiment, both the case 10 and the cover 20 may be made of stainless steel or nickel, and in some other embodiments, the case 10 and the cover 20 may also be made of other metal materials, and the types of the other metal materials are not further limited herein.

In the present embodiment, the top end of the side wall 12 of the case has a first connection surface 121, and one side of the cover 20 close to the case 10 has a second connection surface 21 (see fig. 2, 6 and 10 in particular), so that when assembling, the first connection surface 121 abuts against the second connection surface 21 and forms a welding seam, and the welding seam is bonded by laser welding or PP glue, thereby completing the packaging of the battery.

It should be noted that, the sizes of the case 10 and the cover 20 are not further limited, because the sizes of the case 10 and the cover 20 can be set according to the model or the size of the battery, as long as the quality and the sealing performance of the battery can be ensured and the energy density of the battery can be improved; on the other hand, it is within the scope of the present application to improve the positioning problem between the housing 10 and the cover 20 and improve the assembling accuracy.

Further, in the present embodiment, the assembly structure between the housing 10 and the cover 20 may include multiple implementation manners, wherein in the present embodiment, the following three implementation manners are specifically exemplified:

as shown in fig. 1 to 4d, a first step portion 122 may be disposed at a top end of the side wall 12 of the housing 10, the first step portion 122 has a first step surface, a side surface of the first step surface close to the cover 20 forms a first connection surface 121, the cover 20 may be disposed with an extension portion 22, and a side surface of the extension portion 22 close to the housing 10 forms a second connection surface 21.

Like this when the assembly, first connection face 121 and second connection face 21 butt and form the welding seam, and the welding seam passes through laser welding or PP glues the bonding to the completion is to the encapsulation of battery, wherein, through setting up first step portion 122, when casing 10 contacted with lid 20 like this, first step portion 122 can be prepositioned before welding or gluing, thereby makes the location more accurate.

Where laser welding is used, the weld may be welded from multiple directions, as shown in fig. 4 a-4 c, for example, the welding can be performed from the top in the direction of arrow a in fig. 4a, and it should be noted that the welding is performed in the direction of arrow a in fig. 4a, specifically, at the position of the fitting clearance between the cover body 20 and the side wall 12, which facilitates the positioning, alternatively, welding may be performed from the side in the direction of arrow b in fig. 4b and along the middle of the cover 20, alternatively, the welding can also be performed along the direction of arrow c in fig. 4c, it should be noted that, when the welding is performed along the direction of arrow c in fig. 4c, this welding position department is favorable to avoiding the chamfer, through welding the seam from a plurality of directions, is favorable to guaranteeing the quality and the leakproofness of battery to improve the location problem between casing 10 and lid 20.

When a PP adhesive bonding mode is adopted, specifically, as shown in fig. 4d, after the assembly of the housing 10 and the cover body 20 is completed, the heat compound connection can be performed through the PP adhesive, so that the quality and the sealing performance of the battery can be ensured as well, wherein the PP adhesive is a plastic adhesive, the main component of the PP adhesive is cyanoethyl acrylate, and the PP adhesive is used for bonding various materials difficult to bond and can fill a gap of 0.1 mm.

Further, one end of the first step portion 122 and the end 221 of the extension portion may be connected by a straight line segment, and the other end of the first step portion 122 and the side wall 12 of the housing may be transitionally connected by an arc segment, wherein a side surface of the straight line segment near the end of the extension portion 22 forms the first connection surface 121, and a side surface of the end of the extension portion 22 near the straight line segment forms the second connection surface 21.

Like this when assembling, first connection face 121 and the butt of second connection face 21, wherein, connect casing 10 and lid 20 through setting up straightway and segmental arc, casing 10 and lid 20 are lived to cladding that like this can the at utmost to be favorable to guaranteeing the leakproofness of battery when the welding, improved the welded fastness and improved the accuracy of location.

As shown in fig. 5 to 8c, a second possible implementation manner is that a top end of the side wall 12 of the housing 10 may be provided with a flange 123, so that when the housing 10 and the cover 20 are assembled, the flange 123 covers an end of the cover 20 (specifically, refer to fig. 8a to 8 c), and a welding seam is formed between the flange 123 and the end of the cover 20, and the welding seam is welded by laser welding or bonded by PP glue. Wherein, through setting up turn-ups 123, the cladding that equally can the at utmost live casing 10 and lid 20 to be favorable to guaranteeing the leakproofness of battery when the welding, improved the welded fastness and improved the accuracy of location.

Specifically, when laser welding is adopted, as shown in fig. 8a and 8b, the welding seam can be welded from multiple directions, for example, from the side along the arrow a direction in fig. 8a and along the middle position of the cover 20, or from the top along the arrow b direction in fig. 8b, and it should be noted that the welding seam is welded from the arrow b direction in fig. 8b specifically along the position of the fit clearance between the cover 20 and the flange 123, which facilitates positioning, and the welding seam is welded from multiple directions, which is beneficial to ensuring the quality and the sealing performance of the battery, and improving the positioning problem between the housing 10 and the cover 20

A third possible implementation manner is that, as shown in fig. 9 to 13, the end of the cover 20 may be provided with a second step portion 23, and the second step portion 23 has a second step surface, and a side of the second step surface close to the housing 10 forms a second connection surface 21.

Like this when the assembly, during lateral wall 12 embedding second step portion 23 of casing 10, first connection face 121 connects 21 butt and forms the welding seam with the second, and the welding seam passes through laser welding or PP and glues the bonding to accomplish the encapsulation to the battery, through setting up second step portion 23, when casing 10 contacted with lid 20 like this, second step portion 23 can be prepositioned before welding or gluing, thereby makes the location more accurate.

When laser welding is performed, a first mode that welding can be performed from a fitting clearance position of a side part along an arrow a direction in fig. 12 is realized; a second way of accomplishing this is that welding can be performed from the fitting clearance position in the direction of arrow b in fig. 13; a third way of achieving this is that welding can also be performed from the position of the fit-together gap along the arrow a direction and the arrow b direction in fig. 14, which is not further limited in this embodiment. Through welding from different positions, the firmness of welding is improved, and the accuracy of positioning is improved.

It should be noted that, the present embodiment includes, but is not limited to, the above welding manners, and it is within the scope of the present application as long as the welding firmness and the positioning accuracy can be improved.

Specifically, when the second stepped portion 23 is provided, the height of the second stepped portion 23 is smaller than that of the cover 20, where the height of the second stepped portion 23 may be h1, and the height of the cover 20 may be h (see fig. 12 in particular), so that the side wall 12 of the housing is securely embedded in the second stepped portion 23, that is, the housing 10 is embedded in the cover 20, thereby achieving the effect of pre-positioning.

Example two

On the basis of the first embodiment, the second embodiment provides a battery 200, which includes a battery core assembly 210 and the battery packaging structure 100 of the first embodiment, wherein the battery core assembly 210 is located in the accommodating cavity 101 of the battery packaging structure 100, and the battery core assembly 210 includes a positive tab and a negative tab, wherein in this embodiment, the battery core assembly 210 may be a winding core.

In order to connect the positive tab and the negative tab to the battery packaging structure 100, in some specific embodiments, the side wall 12 of the casing of the battery packaging structure 100 may have a first welding region 124 and a second welding region 125, wherein one of the first welding region 124 and the second welding region 125 is connected to the positive tab, and the other of the first welding region 124 and the second welding region 125 is connected to the negative tab, and in this embodiment, the first welding region 124 is connected to the positive tab, and the second welding region 125 is connected to the negative tab.

In order to prevent the first welding region 124 and the second welding region 125 from being welded through, during the welding of the positive tab and the negative tab, the penetration depth of the positive tab during welding is smaller than the thickness of the side wall 12 of the case 10, and the penetration depth of the negative tab during welding is also smaller than the thickness of the side wall 12 of the case 10, wherein the penetration depth refers to the distance between the deepest position of the base material melting portion and the surface of the base material.

Further, in order to prevent the first welding area 124 and the second welding area 125 from being welded through, in this embodiment, a reinforcing member 126 may be further included, and the reinforcing member 126 may be disposed on the side wall 12 of the casing, wherein the reinforcing member 126 may be disposed separately corresponding to the first welding area 124, or the reinforcing member 126 may be disposed separately corresponding to the second welding area 125, or the reinforcing member 126 may be disposed outside both the first welding area 124 and the second welding area 125. It should be noted that the specific metal type used for the reinforcement 126 is not limited.

It should be added that, in order to improve the safety performance of the battery 200, after the welding of the casing 10 and the cover 20 is completed, the battery needs to be placed into an oven to be baked for more than 8 hours to dry the moisture inside the electric core assembly 210, and specifically, the drying manner is not particularly limited.

Next, after the moisture in the electric core pack 210 is dried and the test is passed, the electrolyte is injected into the electric core pack 210, specifically, in some embodiments, an electrolyte injection hole 127 may be provided in the side wall 12 of the case, the electrolyte is injected into the electric core pack 210 through the electrolyte injection hole 127, and then the electrolyte injection hole 127 is encapsulated, or in some other embodiments, the case 10 and the cover 20 may be encapsulated first, and then the electrolyte injection hole 127 is opened in the case 10, and the electrolyte is injected into the electric core pack 210 through the electrolyte injection hole 127.

Specifically, annotate the liquid process and can include the leakproofness that detects casing 10 through annotating liquid hole 127 malleation, and manage to find time the pressurize and pour into electrolyte, weigh respectively before annotating the liquid and after annotating the liquid, electrolyte weighs qualified back, clean annotating liquid hole 127, for example can be through the mode that the non-woven fabrics was wiped, get rid of and annotate the greasy dirt in liquid hole 127 surface electrolyte and the manufacturing process, liquid hole 127 is annotated in order to realize sealed in laser welding afterwards, and carry out helium detection to the electric core group 210 that accomplishes the seal welding and detect, sealed qualified sample that detects then can flow into and become the process.

The battery 200 provided by the second embodiment includes the battery cell assembly 210 and the battery packaging structure 100, and the assembly between the casing 10 and the cover 20 is realized by adopting various structures, and the welding seams are subjected to laser welding or PP glue bonding from multiple directions, so that on one hand, the quality and the sealing property of the battery 200 are favorably ensured, and the energy density of the battery 200 is improved; on the other hand, the positioning problem between the housing 10 and the cover 20 is improved, and the assembling accuracy is improved.

In the description of the embodiments of the present invention, it should be understood that the terms "mounted," "connected," and "welded" are to be construed broadly, e.g., as meaning fixedly welded, indirectly connected through intervening media, communicating between two elements, or interacting between two elements, unless expressly stated or limited otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations. The terms "upper", "lower", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing and simplifying the description, but do not indicate or imply that the referred devices or elements must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. In the description of the present invention, "a plurality" means two or more unless specifically stated otherwise.

The terms "first," "second," "third," "fourth," and the like in the description and in the claims of the present application and in the above-described drawings are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.