CN213304244U

CN213304244U - Battery shell assembly and battery

Info

Publication number: CN213304244U
Application number: CN202022245705.3U
Authority: CN
Inventors: 胡江波; 曹志锋
Original assignee: Shenzhen Heyi New Energy Technology Co ltd
Current assignee: Shenzhen Heyi New Energy Technology Co ltd
Priority date: 2020-10-10
Filing date: 2020-10-10
Publication date: 2021-05-28
Anticipated expiration: 2030-10-10

Abstract

The utility model discloses a battery shell component, which comprises a top cover and a shell which are matched with each other; the top cover comprises a conductor, a sealing ring and a cover body; the cover body is provided with a through hole, the electric conductor is arranged in the through hole, and the sealing ring is filled between the electric conductor and the cover body to insulate and separate the electric conductor and the cover body; an electric core accommodating groove is formed in the shell, and an annular welding table protruding outwards is arranged on the side wall of the electric core accommodating groove; when the top cover and the shell are assembled for use, the welding table can be welded and sealed with the edge of the cover body. This battery shell subassembly has avoided scrapping because the sealing washer warp the battery short circuit that leads to, also makes electric core can fill whole electric core storage tank as far as simultaneously, therefore can show the volume energy density who promotes the battery.

Description

Battery shell assembly and battery

Technical Field

The utility model relates to a battery technology field especially relates to a battery housing subassembly and battery.

Background

With the development of society, batteries have played an increasingly important role in human production and life, are widely applied to various fields, and become essential energy storage appliances in human daily life. The button cell has the advantage of small volume, is suitable for portable use, and is mainly used in electronic watches, Bluetooth earphones, mainboards and other small electronic equipment.

Conventional button cells generally include a housing and a cell disposed inside the housing. More specifically, the casing generally includes an outer battery casing and an inner battery casing, each of which generally includes a metal cover plate and an annular peripheral wall formed by bending perpendicularly to the metal cover plate, a cell accommodating groove is defined by the metal cover plate and the annular peripheral wall, and the outer battery casing and the inner battery casing are fitted together, wherein an outer diameter of the annular peripheral wall of the inner battery casing is smaller than an inner diameter of the annular peripheral wall of the outer battery casing, so that the inner battery casing can be inserted into the outer battery casing. During assembly, an insulating rubber ring is sleeved on the peripheral wall of the appearance of the inner shell of the battery in advance, the battery core is arranged in the battery core accommodating groove, the inner shell of the battery is embedded in the outer shell of the battery, and finally, the outer shell of the battery and the inner shell of the battery are pressed to form the sealed button battery by adopting professional equipment.

However, the structural design of the conventional button cell is not reasonable enough, the inner shell and the rubber ring occupy the volume inside a large number of cells, and the increase of the volume capacity density of the cells is limited. Moreover, the sealing rubber ring is deformed and dislocated with probability in the process of pressing the outer battery shell and the inner battery shell, so that the battery is scrapped due to short circuit, and the yield is limited to be improved in the process of preparing the battery.

SUMMERY OF THE UTILITY MODEL

Therefore, it is necessary to provide a battery case assembly which can improve the volume capacity density of the battery and prevent the battery from short circuit caused by deformation and dislocation of the sealing rubber ring, and further, a battery formed by assembling the battery case assembly is provided.

According to one embodiment of the present invention, a battery housing assembly includes a top cover and a housing that are adapted;

the top cover comprises a conductor, a sealing ring and a cover body; the cover body is provided with a through hole, the electric conductor penetrates through the through hole, the sealing ring is filled between the electric conductor and the cover body to insulate and separate the electric conductor and the cover body, and the cover body is also provided with a liquid injection hole for injecting electrolyte;

an electric core accommodating groove is formed in the shell, and an annular welding table is connected to the outer side wall of the electric core accommodating groove; when the top cover and the shell are assembled for use, the edge of the cover body is welded and sealed with the welding table.

In one embodiment, the side wall of the casing is bent outward at the notch of the battery cell accommodating groove to form the welding table.

In one embodiment, the width of the weld pad is greater than the sidewall thickness of the housing.

In one embodiment, the width of the welding table is 0.1 mm-10 mm.

In one embodiment, the welding table is further provided with an annular limiting body protruding out of the welding table, and when the top cover and the shell are assembled and used, the edge of the cover body can be abutted against the limiting body.

In one embodiment, the outer peripheral surface of the cover body is recessed to form a yielding groove, and the yielding groove is provided with a first groove wall and a second groove wall; when the top cover and the shell are assembled and used, the first groove wall is abutted against the side wall of the limiting body; the second groove wall is abutted against the top wall of the limiting body.

In one embodiment, the weld station is selected from an aluminum weld station, an aluminum alloy weld station, or a stainless steel weld station; and/or

The cover body is selected from an aluminum welding table, an aluminum alloy welding table or a stainless steel welding table; and/or

The shell is selected from an aluminum shell, an aluminum alloy shell or a stainless steel shell.

In one embodiment, a non-edge position of the cover body is provided with a protruding portion protruding from an edge of the cover body, and the through hole is formed in the protruding portion.

In one embodiment, the seal ring is joined to the cover in a unitary structure.

Further, a battery, characterized in that, including electric core and according to above-mentioned any embodiment the battery casing subassembly, electric core set up in the electric core storage tank, the top cap sets up on the casing, just the edge of top cap with the welding bench welded seal.

In one embodiment, the battery cell comprises a plurality of charge and discharge assemblies, each charge and discharge assembly comprises a positive plate, a negative plate and a diaphragm, and the diaphragm is arranged between the positive plate and the negative plate; a plurality of the charge and discharge assemblies are arranged in a laminated mode.

In one embodiment, each of the charge and discharge assemblies further includes a positive tab connected to the positive tab and a negative tab connected to the negative tab, and the positive tab and the negative tab are electrically connected to the conductor and the case, respectively.

When the battery shell assembly is actually assembled and used, one electrode of the battery cell can be electrically connected with the electric conductor in the top cover, and then the battery cell is placed in the battery cell accommodating groove, and the other electrode of the battery cell is connected with the shell. And then the top cover is covered on the shell, so that the edge of the cover body is aligned with the welding table on the shell, and the cover body and the welding table are welded and sealed. In the structure of the battery case assembly, the conductor and the cover are insulated and separated by the sealing ring in advance, the conductor can be used as one electrode contact of the battery, and the cover and the case can be used as the other electrode contact of the battery. The lid can directly take place to be connected with the casing electricity, therefore can take and assemble welding bench and lid welded seal's mode, has avoided traditional button cell to need the problem of pressfitting sealing rubber ring when the equipment, therefore has avoided scrapping because the sealing washer warp the battery short circuit that leads to. Meanwhile, the sealing ring or the cover body is prevented from occupying the internal volume of the battery, and the battery cell can be filled with the whole battery cell accommodating groove as far as possible, so that the volume energy density of the battery can be remarkably improved.

Drawings

FIG. 1 is a schematic view of an embodiment of a battery housing assembly;

fig. 2 is a detailed schematic view of the top cover 100 of the battery housing assembly shown in fig. 1;

FIG. 3 is a detailed view of the lid 130 of the overcap 100 shown in FIG. 2;

FIG. 4 is a detailed view of the seal ring 120 of the overcap 100 shown in FIG. 2;

FIG. 5 is a detailed schematic view of the electrical conductor 110 in the header 100 of FIG. 2;

fig. 6 is a detailed schematic diagram of the housing 200 of the battery housing assembly of fig. 1;

FIG. 7 is a schematic diagram of a battery according to an embodiment;

wherein, each reference number and its corresponding meaning in the above figures are as follows:

100: a top cover; 110: an electrical conductor; 111: a first conductive portion; 112: a second conductive portion; 113: a through-hole conductive portion; 120: a seal ring; 121: a first seal portion; 122: a second seal portion; 123: a through hole sealing portion; 130: a cover body; 1301: a first surface; 1302: a second surface; 131: a through hole; 132: a liquid injection hole; 133 a boss; 134: a yielding groove; 1341: a first slot wall; 1342: a second slot wall; 200: a housing; 210: a battery cell accommodating groove; 220: a side wall; 230: a welding table; 240: a limiting body. 310: a charge and discharge assembly; 311: a positive plate; 312: a negative plate; 313: a diaphragm; 321: a positive tab; 322: and a negative tab.

Detailed Description

In order to facilitate understanding of the present invention, the present invention will be described more fully below with reference to the following embodiments and effect drawings. The preferred embodiments of the present invention have been described. The invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly secured to the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. In addition, in the description of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or may be connected through two or more elements. It should be understood that it is a matter of course that those skilled in the art can correspondingly understand the specific meanings of the above terms according to specific situations without causing ambiguity.

Unless otherwise defined, in the description of the present invention, terms indicating orientation or positional relationship such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the orientation or positional relationship shown in the drawings of the present invention, which are only for convenience and simplicity in describing the contents of the present invention, and help the reader understand the drawings, not for defining or implying a specific orientation that the referred device or element must have, and thus should not be interpreted as limiting the present invention.

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 invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items. "multi" herein includes a combination of two or more items.

The structural design of traditional button cell is not reasonable enough, and interior casing and rubber ring have taken the inside volume of a large amount of batteries, have restricted the volume capacity density of battery to promote. Moreover, the sealing rubber ring is deformed and dislocated with probability in the process of pressing the outer battery shell and the inner battery shell, so that the battery is scrapped due to short circuit, and the yield is limited to be improved in the process of preparing the battery.

The utility model provides a battery case subassembly can solve above-mentioned problem betterly. According to one embodiment of the present invention, a battery housing assembly includes a top cover and a housing that are adapted;

the top cover comprises a conductor, a sealing ring and a cover body; the cover body is provided with a through hole, the electric conductor is arranged in the through hole, and the sealing ring is filled between the electric conductor and the cover body to insulate and separate the electric conductor and the cover body;

an electric core accommodating groove is formed in the shell, and an annular welding table is connected to the outer side wall of the electric core accommodating groove; when the top cover and the shell are assembled for use, the welding table can be welded and sealed with the edge of the cover body.

The utility model discloses in the problem that provides can be applicable to button cell and can effectively improve in the button cell, nevertheless does not mean that it only can be used as button cell, the battery of other types, as long as can adopt the utility model provides a battery housing subassembly's shape and structure are prepared, all should regard as the utility model discloses a battery housing subassembly's application scope.

Specifically, please refer to fig. 1, which illustrates a structure of a battery housing assembly, which includes a top cover 100 and a housing 200. Further, please refer to fig. 2 for a more specific structure of the top cover 100.

The top cover is matched with the shell. It is to be understood that "fit" means that the top cover 100 and the case 200 can be assembled to form an integral battery case, since the top cover 100 and the case 200 need to be assembled for use.

The top cover 100 comprises an electric conductor 110, a sealing ring 120 and a cover body 130, the cover body 130 is provided with a first surface 1301 and a second surface 1302 which are oppositely arranged, a through hole 131 is arranged in the cover body 130, and the through hole 131 penetrates through the first surface 1301 and the second surface 1302; the conductor is disposed in the through hole 131, and the seal ring 120 is filled in a gap between the conductor 110 and the cover 130. The seal ring 120 is an insulating seal ring for insulating the space conductor 110 and the cover 130 and preventing a short circuit between the conductor 110 and the cover 130. In this embodiment, when the top cover 100 and the housing 200 are assembled for use, the first surface 1301 is away from the housing 200, the second surface 1302 is close to the housing 200, and the first surface 1301 is located above and the second surface 1302 is located below in the orientation shown in fig. 2.

In a specific example, the sealing ring 120 includes a first sealing portion 121 covering the first surface 1301 of the cover 130 and a second sealing portion 122 covering the second surface 1302, and the sealing ring 120 further includes a through hole sealing portion 123 contacting with the hole wall of the through hole 131; the through hole sealing part 123 is connected to the first sealing part 121 and the second sealing part 122. More preferably, the first sealing part 121 is formed by extending the through hole sealing part 123 along the first surface 1301 of the cover 130, and the second sealing part 122 is formed by extending the through hole sealing part 123 along the second surface 1302 of the cover 130. The seal ring provided with the coating portion can more effectively prevent a short circuit between the conductor 110 and the cover 130.

In one specific example, the sealing ring 120 is integrally formed directly on the cover 130. Specifically, the integrated molding may be injection molding. The injection molding process may be performed by using a mold, so to prepare the top cover 100 in the present embodiment, the molded cover 130 may be first placed inside the mold, the mold should be capable of accommodating the cover 130, and a space for injection molding is reserved at the through hole 131 of the top cover 130. The raw material of the sealing ring 120 is injected into the empty space, and is integrally molded after being cooled to be disposed on the surface of the through hole 131 of the cover body 110.

The integrally formed seal ring 120 and the cover 130 are in close contact with each other, and are not easily deformed or fall off. In other specific examples, the sealing ring 120 may be sleeved on the through hole 131 of the cover 130. In some specific examples, the seal ring 120 is a soft seal ring. By "soft" is understood that the seal ring 120 can be deformed under external pressure without brittle fracture of the seal ring 120. For example, the seal ring 120 may be selected from a plastic seal ring, a rubber seal ring, or a plastic rubber composite seal ring. The plastic sealing ring, the rubber sealing ring or the plastic rubber composite sealing ring has good elasticity and sealing performance, is easy to process, and can be easily prepared in the through hole 1301 on the cover body 130. Further, the sealing ring 120 is integrally molded on the surface of the cover body 130, so that the sealing ring 120 and the cover body 110 do not need to be assembled again in the actual assembly process, and the process is simplified.

In one specific example, the conductive body 110 includes a first conductive portion 111 provided on the surface of the first sealing portion 121, a second conductive portion 112 provided on the surface of the second sealing portion 122, and a through hole conductive portion 113 provided in the through hole sealing portion 123, according to the configuration of the seal ring 120. The through-hole conductive portion 113 is disposed in electrical contact with the first conductive portion 111 and the second conductive portion 112. The first conductive portion 111 and the second conductive portion 112 have a larger specific surface area than the cross section of the through hole 131, and are suitable as contacts, and specifically, the first conductive portion 111 may serve as a contact for electrically connecting an external electric device and a battery; the second conductive part 112 may serve as a contact electrically connected to the cell inside the battery.

In a specific example, the lid 130 is further provided with a liquid injection hole 132 penetrating through the first surface 1301 and the second surface 1302, and the liquid injection hole 132 can be used for injecting electrolyte into the battery. Annotate liquid hole 132 and make this battery can be in the step of annotating the liquid again after the equipment is accomplished, be favorable to accurate control to annotate the liquid volume, the operation in the actual assembly process of being convenient for. After the electrolyte is injected through the injection hole 132, the injection hole 132 may be sealed with a sealing member, specifically, for example, a steel ball that is adapted to the shape of the injection hole.

In a specific example, a protruding portion 133 is disposed in the cover 130, the protruding portion 133 is disposed protruding from the edge of the cover 130, and the through hole 1301 is disposed on the protruding portion 133. It can be understood that the protrusion 133 protrudes from the edge of the cover 130, when the top cover 100 and the housing 200 are assembled for use, the edge of the cover 130 is closer to the housing 200, and there is a wider gap between the protrusion 133 and the housing 200 than the edge of the cover 130, and the gap can be used as a wiring area for a cell lead-out wire.

In a specific example, when the sealing ring 120 is provided with the first sealing portion 121 and/or the second sealing portion 122, a first fixing groove 134 is provided on a surface of the cover 130 opposite to the first sealing portion 121 of the sealing ring 120, and/or a second fixing groove 135 is provided on a surface of the cover 130 opposite to the second sealing portion 122 of the sealing ring 120. The first and second fixing grooves 134 and 135 can assist the sealing ring 120 to be fixed to the cover 130.

The battery cell accommodating groove 210 is formed in the casing 200, the annular welding table 230 protruding outwards is arranged on the side wall 220 of the battery cell accommodating groove 210, and when the top cover 100 and the casing 200 are assembled for use, the welding table 230 can be welded and sealed with the edge of the cover 130.

In one particular example, the welding of the weld seal is a laser weld seal. The laser has the advantages of high positioning accuracy, small welding spot and short action time, and can accurately weld the cover 130 and the welding table 230 together.

Although the annular welding stage 230 is not provided, for example, the side wall of the cell accommodating groove 210 is directly provided in a vertically upward extending shape, it is also possible to achieve welding of the edge of the top cover 100 and the side wall of the casing 200 together. However, the inventors have found that such a welding method results in a low energy density of the battery, which is not produced by actual production of the battery. Furthermore, the welding stage 230 is additionally disposed on the housing 200 in this embodiment, and the welding stage 230 can effectively increase the energy density of the battery, as will be described in detail below. The inventor finds that for a shell without an annular welding table, welding directly occurs on the side wall of the battery cell accommodating groove, on one hand, a large amount of heat can be generated at a welding spot in the welding process, and the part of an internal battery cell close to the welding spot can be heated, so that local electrode materials can deteriorate, and the discharge capacity of the battery cell is influenced; on the other hand, when the side wall with the limited thickness is subjected to laser welding, for example, a welding point can generate a bulge in the battery cell accommodating groove, and the bulge can directly contact the internal battery cell material to cause burn and influence the discharge capacity of the battery cell; on the other hand, light leakage may occur during laser welding, which causes laser to directly hit the cell and directly burn the cell.

The welding stage 230 has the following functions in the battery case assembly of this embodiment: in one aspect, the welding stage 230 protrudes outward from the sidewall 220, and during welding, heat at the welding point is transferred faster on the annular welding stage 230 body, and the heat transferred to the sidewall 220 cannot cause local electrode material deterioration. On the other hand, the welding direction can be right opposite to the welding table 230, and the protruding direction of the welding spot faces to the outside of the battery cell accommodating groove and cannot contact the battery cell material, so that the burn to the battery cell material is avoided; in a similar way, even if light leakage occurs, the laser cannot irradiate the battery cell, and the battery cell cannot be damaged. In the case 200 provided with this welding table 230, the cell material may be densely packed in the cell accommodating groove 210, and thus as an additional advantage, the space inside the case 200 is more sufficiently utilized, and the volume energy density of the battery can be further improved.

It is understood that the width of the welding stage 230 is not too wide or too narrow; too narrow increases the probability of damaging the cell material during soldering, and too wide affects the space occupied by the case 200. In one particular example, the width of the weld station 230 is slightly greater than the thickness of the sidewall 220. In another specific example, the width of the welding stage 230 is 0.1mm to 10 mm; more specifically, the width of the soldering station is 0.2mm to 5 mm.

In one embodiment, the welding stage 230 is formed by bending the sidewall 220 of the casing 200 outward at the notch of the cell accommodating groove 210. Such a formation is more advantageous for the actual production of the soldering station. Specifically, after the side wall 220 is formed, the welding stage 230 may be formed by simply bending the top end of the side wall 220 outward. Of course, in other specific examples, the welding table may also be an integrated annular welding table formed separately and joined to the side wall, and the welding table may be disposed at the notch of the battery cell accommodating groove 210 or at the waistline of the side wall 220.

In a specific example, the welding stage 230 is further provided with an annular limiting body 240 protruding from the welding stage 230. When the top cover 100 and the housing 200 are assembled and used, the edge of the cover 130 can be disposed in contact with the stopper 230. The position limiting body 240 may be used to limit the position of the cover 130, so that the cover 130 can be conveniently aligned with the welding stage 230.

In some embodiments, the material of each part of the battery case assembly may be aluminum, copper, iron or an alloy of the above metals. The conventional button cell is usually made of stainless steel material because it needs to be pressed further after assembly, which requires high rigidity of the case. However, stainless steel is a relatively high density metal, which increases the overall weight of the cell. In the battery case assembly of the present embodiment, since the step of pressing is not required, the material of each portion of the battery case assembly may be a light aluminum material or an aluminum alloy material. Wherein, in some specific examples, the weld station 230 is selected from an aluminum weld station, an aluminum alloy weld station, or a stainless steel weld station; in some specific examples, the cover 130 is selected from an aluminum cover, an aluminum alloy cover, or a stainless steel cover; in some specific examples, the housing 200 is selected from an aluminum housing, an aluminum alloy housing, or a stainless steel housing. The aluminum or the aluminum alloy not only has lower density, but also has lower melting point, can be more easily melted and welded in the welding process, and can also reduce the influence of heat on the battery core as much as possible.

Corresponding to the limiting body 240, in a specific example, the edge of the cover 130 is provided with an annular yielding groove 134, and the yielding groove 134 is adapted to the limiting body 240. More specifically, the relief groove is an L-shaped groove. The L-shaped slot generally has a first slot wall and a second slot wall that intersect, and the first slot wall and the second slot wall may be disposed vertically, but may not be perpendicular.

In a particular example of the present embodiment, the yielding slot 134 includes a first slot wall 1341 and a second slot wall 1342. More specifically, the first slot wall 1341 is in a horizontal direction, the second slot wall 1342 is in a vertical direction, and the first slot wall 1341 and the second slot wall 1342 are perpendicular. When the top cover 100 and the housing 200 are assembled and used, the first slot wall 1341 of the abdicating slot 134 is abutted against the side wall of the limiting body 240, and the second slot wall 1342 is abutted against the top wall of the limiting body 240. In one aspect, the relief groove 134 may cooperate with the stop 240 to facilitate alignment between the top cover 130 and the welding stage 230. On the other hand, the second groove wall 1342 of the abdicating groove 134 can be used as a welding part, the second groove wall 1342 and the limiting body 240 are welded together, the sealing performance between the top cover 100 and the casing 200 can be increased by means of the bending structure of the abdicating groove 134, the welding part is far away from the interior of the battery cell accommodating groove 210 as far as possible, and the probability of burning the battery cell is further reduced.

When the battery casing assembly is actually assembled and used, one electrode of the battery cell may be electrically connected to the conductor 110 in the top cover 100, and then the battery cell is placed in the battery cell accommodating groove 210, and the other electrode of the battery cell is connected to the casing 200. The top cover 100 is then placed on the housing 200, such that the edge of the cover 130 is aligned with the welding stage 230, and the two are welded and sealed.

In the structure of the battery case assembly, the conductor 110 and the cover 130 are insulated and spaced by the gasket 120, the conductor 110 may serve as one electrode contact of the battery, and the cover 130 and the case 200 may serve as the other electrode contact of the battery. The cover 130 can be directly electrically connected with the housing 200, so that the assembly can be performed in a welding manner, and the problem that the sealing rubber ring of the conventional button cell battery needs to be pressed is avoided during the assembly, so that the battery short circuit scrap caused by the deformation of the sealing ring is avoided. Meanwhile, the sealing ring 120 or the cover body 130 is prevented from occupying the internal volume of the battery by the structure, and the battery cell can fill the whole battery cell accommodating groove 210 as far as possible, so that the volume energy density of the battery can be remarkably improved.

Moreover, the welding stage 230 protrudes outward from the sidewall 220, and during welding, the heat at the welding point is transmitted faster on the annular welding stage 230 body, and the heat transmitted to the sidewall 220 cannot cause the local electrode material to deteriorate. On the other hand, the welding direction can be just to welding bench 230, outside the protruding direction orientation electric core storage tank of solder joint, can not contact electric core material, therefore avoided the burn to electric core material. In the case 200 provided with this welding table 230, the cell material may be densely packed in the cell accommodating groove 210, and thus as an additional advantage, the space inside the case 200 is more sufficiently utilized, and the volume energy density of the battery can be further improved.

According to the utility model discloses a further embodiment, a battery, it includes electric core and battery case subassembly, and the battery case subassembly is the battery case subassembly that above-mentioned embodiment provided, and the top cap among the battery case subassembly sets up on the casing, and the edge of top cap and the welding bench welding of casing are sealed, and electric core sets up in the electric core storage tank in the casing.

More specifically, please refer to fig. 7 for a specific schematic diagram of the battery of this embodiment. Including the assembled top cover 100, the casing 200, and the battery cell disposed inside the battery.

In a specific example, the battery cell includes a plurality of charge and discharge assemblies 310, each charge and discharge assembly 310 includes a positive electrode tab 311, a negative electrode tab 312, and a separator 313, the separator 313 is disposed between the positive electrode tab 311 and the negative electrode tab 312, and the positive electrode tab 311 and the negative electrode tab 312 are insulated and spaced. A plurality of charge and discharge assemblies 310 are provided in the form of a laminate. The plurality of charge and discharge assemblies 310 arranged in the laminated manner can fully occupy the space inside the battery, increase the utilization rate of the space inside the battery and improve the volume energy density of the battery.

In a specific example, in order to further simplify the structure, in the plurality of charge and discharge assemblies 310, the negative electrode sheets 312 of the adjacent charge and discharge assemblies 310 may share the same negative electrode, for example, as shown in fig. 7, a positive electrode sheet 311, a separator 313, a negative electrode sheet 312, a separator 313, and a positive electrode sheet 311 are sequentially disposed from left to right, wherein the negative electrode sheet 312 serves as both the negative electrode of the first charge and discharge assembly and the negative electrode of the second charge and discharge assembly.

In a specific example, each charge and discharge assembly 310 further includes a positive tab 321 connected to the positive tab 311 and a negative tab 322 connected to the negative tab 312. Positive tab 321 and negative tab 322 are electrically connected to conductor 110 and case 200, respectively, and one example of such connection is that one of positive tab 321 and negative tab 322 is electrically connected to conductor 110 in top cover 100, and the other is electrically connected to case 200.

For example, as shown in fig. 7, negative tab 322 is electrically connected to conductor 110, and more specifically, negative tab 322 is electrically connected to second conductive portion 112. The negative electrode tabs 322 may be electrically connected to the second conductive portion 112 by each negative electrode tab 312 leading out of the negative electrode tab 322 and connecting to the second conductive portion 112, or by connecting a plurality of negative electrode tabs 322 into one strand and then connecting to the second conductive portion 112 in a unified manner. The positive electrode tabs 321 may be electrically connected to the housing 200 in a manner that each positive electrode tab 311 is led out of the positive electrode tab 321 and is respectively connected to a portion of the housing 200 close to the positive electrode tab, or all the positive electrode tabs 321 are connected into one strand and then are electrically connected to the housing 200 uniformly. Also, it is understood that the cover 130 and the case 200 can be electrically connected to each other, and thus the electrical connection to the case 200 also includes the case where the case 200 is electrically connected by being connected to the cover 130.

Further, the embodiment also provides a preparation method of the battery, which comprises the following steps.

With the battery case assembly and the battery cell according to any of the above embodiments, the battery case assembly, as shown in fig. 1 to 6, should include the top cover 100 and the case 200.

The top cover 100 includes a conductive body 110, a sealing ring 120, and a cover 130, the cover 130 has a through hole 131, the conductive body is disposed in the through hole 131, and the sealing ring 120 is filled in a gap between the conductive body 110 and the cover 130. A cell accommodating groove 210 is formed in the casing 200, and an annular welding table 230 protruding outward is disposed on a side wall 220 of the cell accommodating groove 210.

In the process of actually assembling the battery, the battery cell may be disposed in the battery cell accommodating groove 210 of the battery housing assembly first. When the cell is provided, one of the positive electrode tab 311 and the negative electrode tab 312 of the cell should be electrically connected to the conductor 110, and the other should be electrically connected to the case 200.

In a specific example, positive tab 321 is led out of positive tab 311, negative tab 322 is led out of negative tab 312, one of positive tab 321 and negative tab 322 is led out and welded to conductor 110, and the other is led out and welded to case 200 by laser welding. For example, the positive tab 321 is laser welded to the case 200, so that the case 200 can serve as a positive contact; the second conductive part 112 of the conductor 110 is laser-welded to the negative tab 322, and the first conductive part 111 of the conductor 110 can be used as a negative contact.

After the cells are arranged as in the above example, the top cover 100 is aligned and covered on the casing 200, the edge of the cover 130 is aligned with the welding stage 230, and then the edge of the cover 130 is welded and sealed with the welding stage 230. In an example in which the recess groove 134 is provided in the cover 130 and the stopper 240 is provided in the case 200, laser welding may be performed at a contact portion between the recess groove 134 and the stopper 240.

According to the above steps, the preparation of the battery of this example can be completed.

In the battery structure, the conductor and the top cover body are insulated and separated by the sealing ring in advance, the conductor can be used as one electrode contact of the battery, and the cover body and the shell can be used as the other electrode contact of the battery. The lid can directly take place to be connected with the casing electricity, therefore can take the welded mode to assemble, has avoided traditional button cell to need the problem of pressfitting sealing rubber ring when the equipment, therefore has avoided scrapping because the sealing washer warp the battery short circuit that leads to. Meanwhile, the sealing ring or the top cover is prevented from occupying the internal volume of the battery, and the battery cell can be filled with the whole battery cell accommodating groove as far as possible, so that the volume energy density of the battery can be remarkably improved.

The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above examples only represent some embodiments of the present invention, and the description thereof is more specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. A battery housing assembly comprising a top cover and a housing adapted to fit together;

2. The battery housing assembly of claim 1, wherein the side wall of the housing is bent outward at the notch of the cell receiving groove to form the welding station.

3. The battery housing assembly of claim 1, wherein the weld lands have a width greater than a sidewall thickness of the housing.

4. The battery case assembly of claim 1, wherein the width of the welding station is 0.1mm to 10 mm.

5. The battery case assembly of claim 1, wherein the welding stage further comprises an annular stopper protruding from the welding stage, and the edge of the cover can abut against the stopper when the top cover and the case are assembled.

6. The battery housing assembly of claim 5, wherein the outer peripheral surface of the cover is recessed to form a relief groove having a first groove wall and a second groove wall; when the top cover and the shell are assembled and used, the first groove wall is abutted against the side wall of the limiting body; the second groove wall is abutted against the top wall of the limiting body.

7. The battery housing assembly of any of claims 1-6, wherein the weld station is selected from an aluminum weld station, an aluminum alloy weld station, or a stainless steel weld station; and/or

8. The battery case assembly according to any one of claims 1 to 6, wherein a non-edge position of the cover is provided with a protrusion protruding from an edge of the cover, and the through hole is provided on the protrusion.

9. The battery housing assembly of any of claims 1-6, wherein the seal ring is bonded to the cover in an integral structure.

10. A battery, comprising a battery core and the battery casing assembly of any one of claims 1 to 9, wherein the battery core is disposed in the battery core accommodating groove, the top cover is disposed on the casing, and an edge of the top cover is welded and sealed with the welding table.

11. The battery of claim 10, wherein the cell comprises a plurality of charge-discharge assemblies, each charge-discharge assembly comprising a positive plate, a negative plate, and a separator, the separator being disposed between the positive plate and the negative plate; a plurality of the charge and discharge assemblies are arranged in a laminated mode.

12. The battery of claim 11, wherein each of the charge and discharge assemblies further comprises a positive tab connected to the positive tab and a negative tab connected to the negative tab, the positive tab and the negative tab being electrically connected to the conductor and the case, respectively.