CN218887261U - Battery with a battery cell - Google Patents

Abstract

The embodiment of the utility model provides a battery, battery including have last core of the last casing of last casing, negative pole current collecting disc and negative pole dry process electrode layer and have lower casing, insulating protective sheath, anodal current collecting disc and the lower core of anodal dry process electrode layer, negative pole current collecting disc and negative pole dry process electrode layer assemble in proper order to the last casing, anodal current collecting disc and anodal dry process electrode layer assemble in proper order down in casing and the insulating protective sheath, go up the core and pass through thread sealing with lower core. In the preparation and assembly process of the battery, a tab welding process, a wet electrode preparation process and a laser welding process are not needed, the problems of burrs, self-discharge and the like can be avoided, the current collecting disc is in direct contact with the electrode layer, the heat transfer efficiency and the electric conduction efficiency are high, and the energy density and the safety performance of the battery are improved.

Description

Battery with a battery cell

Technical Field

The utility model relates to a battery technology field, concretely relates to battery.

Background

With the development of science and technology, the energy storage mode of the lithium battery is widely applied from 3C digital to the fields of automobile and aerospace and the like, the life and travel modes of human beings are changed, and the influence on the human beings is profound. The lithium battery manufacturing process generally comprises three processes, namely electrode, assembly and formation. Among them, the electrode process is the most important and basically determines the performance and consistency of the battery.

Currently, most manufacturers use wet-process electrode preparation techniques and equipment. The wet electrode process comprises the processes of homogenizing, coating, drying, rolling, slitting, tab welding and the like, the whole electrode process is complex, the energy consumption in the process is extremely high, and the environment is easily polluted and the body of an operator is easily damaged. In addition, NMP, H2O, etc. as a solvent remain in the electrode sheet, affecting the performance of the battery, and reducing the service life of the lithium battery. Meanwhile, most batteries are easy to generate metal dust during assembling, welding and sealing, and the self-discharge safety performance of the batteries is affected.

SUMMERY OF THE UTILITY MODEL

In view of this, the embodiment of the utility model provides a battery need not utmost point ear welding process, wet process electrode preparation process and laser welding process, can avoid burr, self-discharge scheduling problem, current collecting disc and electrode layer direct contact, and heat transfer and electrically conductive efficient have improved the energy density and the security performance of battery simultaneously.

An embodiment of the utility model provides a battery, the battery includes:

the upper pole core comprises an upper shell with first threads, an anode current collecting disc and an anode dry electrode layer, wherein the anode current collecting disc and the anode dry electrode layer are sequentially assembled in the upper shell;

the lower pole core comprises a lower shell, an insulating protective sleeve, a positive current collecting disc and a positive electrode dry-method electrode layer, the insulating protective sleeve is embedded in the lower shell and is provided with a second thread, and the positive current collecting disc and the positive electrode dry-method electrode layer are sequentially assembled in the lower shell and the insulating protective sleeve;

wherein the upper pole piece and the lower pole piece are hermetically connected by the first thread and the second thread.

Further, the lower pole piece further includes:

the positive pole column is positioned on the outer side of the lower shell, and part of the positive pole column and part of the positive current collecting disc penetrate through the insulating protective sleeve and are welded with the lower shell;

and the sealing ring is sleeved on the positive current collecting disc, the lower shell and the positive pole column, and the lower shell is provided with the sealing ring.

Further, the upper pole core further comprises a first solid electrolyte layer which is arranged in the upper shell and positioned above the negative electrode dry electrode layer;

the lower pole core also comprises a second solid electrolyte layer which is arranged in the lower shell and positioned above the positive electrode dry-method electrode layer;

and after the upper pole piece and the lower pole piece are hermetically connected, the first solid electrolyte layer and the second solid electrolyte layer are jointed and connected.

Further, the upper pole core also comprises a first diaphragm which is arranged in the upper shell and positioned above the negative electrode dry-method electrode layer;

the lower pole piece also comprises a second diaphragm and electrolyte, the second diaphragm is arranged in the lower shell and positioned above the positive dry electrode layer, and the electrolyte is filled in the lower shell.

Further, the upper shell and the lower shell are aluminum shells or steel shells, the thickness of the upper shell and the lower shell is 0.3mm-5mm, the material of the insulating protective sleeve comprises at least one of polybutylene terephthalate, high polymer polypropylene and polyethylene terephthalate, and the thickness of the insulating protective sleeve is 0.3mm-4mm.

Further, negative pole current collector dish is the copper product, anodal current collector dish is aluminum product or copper aluminum alloy, anodal utmost point post is the aluminum product, the material of sealing washer includes at least one in polybutylene terephthalate, high polymer polypropylene, the polyethylene glycol terephthalate.

Further, the negative electrode dry-process electrode layer is formed by high-temperature rolling after mixing and fiberizing a fiberized binder, a conductive agent and a negative active material, the positive electrode dry-process electrode layer is formed by high-temperature rolling after mixing and fiberizing a fiberized binder, a conductive agent and a positive active material, the positive electrode dry-process electrode layer is formed by stacking a plurality of layers of positive electrode plates, and the negative electrode dry-process electrode layer is formed by stacking a plurality of layers of negative electrode plates.

Furthermore, the battery also comprises a sealing adhesive layer, wherein the sealing adhesive layer is formed by coating a sealing adhesive on the outer side of the upper pole core and the outer side of the lower pole core after the upper pole core and the lower pole core are in threaded connection.

The embodiment of the utility model provides a battery, battery including have last casing, negative pole current collecting disc and negative pole dry process electrode layer last utmost point core and have down casing, insulating protective sheath, anodal current collecting disc and the lower utmost point core of anodal dry process electrode layer, in negative pole current collecting disc and negative pole dry process electrode layer assembled in proper order the upper casing, anodal current collecting disc and anodal dry process electrode layer assembled in proper order down in casing and the insulating protective sheath, upward utmost point core and lower utmost point core pass through screw thread sealing and connect. In the preparation and assembly process of the battery, a tab welding process, a wet electrode preparation process and a laser welding process are not needed, the problems of burrs, self-discharge and the like can be avoided, the current collecting disc is in direct contact with the electrode layer, the heat transfer efficiency and the electric conduction efficiency are high, and the energy density and the safety performance of the battery are improved.

Drawings

The above and other objects, features and advantages of the present invention will become more apparent from the following description of the embodiments of the present invention with reference to the accompanying drawings, in which:

fig. 1 is a cross-sectional view of an upper pole piece of a solid-state battery according to an embodiment of the present invention;

fig. 2 is a cross-sectional view of a lower pole piece of a solid-state battery of an embodiment of the present invention;

fig. 3 is a cross-sectional view of a solid-state battery of an embodiment of the present invention;

fig. 4 is a cross-sectional view of an upper pole piece of a semi-solid battery according to an embodiment of the present invention;

fig. 5 is a cross-sectional view of a lower pole piece of a semi-solid battery of an embodiment of the present invention;

fig. 6 is a cross-sectional view of an upper pole piece of a liquid battery according to an embodiment of the present invention;

fig. 7 is a cross-sectional view of a lower pole piece of a liquid battery according to an embodiment of the present invention.

Description of the drawings reference numbers:

1-upper pole core; 11-a first thread; 12-an upper housing; 13-an anode current collector; 14-negative electrode dry electrode layer; 15-a first solid electrolyte layer; 16-a first membrane; 2-lower pole core; 21-a second thread; 22-a lower housing; 23-an insulating protective sleeve; 24-a positive collector plate; 25-positive electrode dry electrode layer; 26-positive pole column; 27-a sealing ring; 28-a second solid electrolyte layer; 29-second diaphragm.

Detailed Description

The present invention will be described below based on examples, but the present invention is not limited to only these examples. In the following detailed description of the present invention, certain specific details are set forth. It will be apparent to those skilled in the art that the present invention may be practiced without these specific details. Well-known methods, procedures, flows, components and circuits have not been described in detail so as not to obscure the present invention.

Further, those of ordinary skill in the art will appreciate that the drawings provided herein are for illustrative purposes and are not necessarily drawn to scale.

Meanwhile, it should be understood that, in the following description, a "circuit" refers to a conductive loop constituted by at least one element or sub-circuit through electrical or electromagnetic connection. When an element or circuit is referred to as being "connected to" another element or element/circuit is referred to as being "connected between" two nodes, it may be directly coupled or connected to the other element or intervening elements may be present, and the connection between the elements may be physical, logical, or a combination thereof. In contrast, when an element is referred to as being "directly coupled" or "directly connected" to another element, it is intended that there are no intervening elements present.

Unless the context clearly requires otherwise, throughout the description, the words "comprise", "comprising", and the like are to be construed in an inclusive sense as opposed to an exclusive or exhaustive sense; that is, what is meant is "including, but not limited to".

In the description of the present invention, it is to be understood that the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. In addition, in the description of the present invention, "a plurality" means two or more unless otherwise specified.

Unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are intended to be inclusive and mean that, for example, they may be fixedly connected or detachably connected or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

Fig. 1 to 7 are schematic structural views of the battery of the present embodiment. As shown in fig. 1 to 7, the battery includes an upper pole piece 1 and a lower pole piece 2. The upper pole piece 1 and the lower pole piece 2 can be hermetically connected through threads after the respective assembly is finished, and the assembly is finished. The thread sealing connection of the embodiment is an organic and inorganic combined interface, so that galvanic reaction can not be generated, and the shell can be ensured to be liquid-tight and rustproof. Meanwhile, the upper pole piece 1 and the lower pole piece 2 are assembled in a thread sealing connection mode, so that the problems of potential safety hazards caused by welding dust and burrs and the influence on the self-discharge safety performance of the battery in the original welding heat affected zone generated by welding technology connection are solved. Further, the threaded connection mode can also reduce the cost.

Specifically, upper pole piece 1 includes upper case 12, anode current collecting disk 13, and anode dry electrode layer 14, and anode current collecting disk 13 and anode dry electrode layer 14 are sequentially fitted into upper case 12, as shown in fig. 1, 3, 4, and 6. The lower pole core 2 comprises a lower shell 22, an insulating protective sleeve 23, a positive pole current collecting disc 24 and a positive pole dry electrode layer 25, wherein the insulating protective sleeve 23 is embedded in the lower shell 22, and the positive pole current collecting disc 24 and the positive pole dry electrode layer 25 are sequentially assembled in the lower shell 22 and the insulating protective sleeve 23, as shown in fig. 2, 3, 5 and 7.

The upper case 12 is a metal container for supporting a negative electrode. The lower shell 22 is a metal container, and the insulating protective sleeve 23 is embedded in the lower shell 22 and used for bearing the positive electrode. The anode current collecting plate 13 is connected to the upper case 12, that is, the upper case 12 is connected to the anode, and the upper case 12 is negatively charged. The positive current collecting plate 24 is positively charged, and an insulating layer is arranged between the positive current collecting plate and the lower shell 22, so that the positive and negative electrodes can be ensured to be charged when not used. Preferably, the upper case 12 and the lower case 22 are cylindrical cases, so that the battery after the connection is a cylindrical battery.

The upper housing 12 has a first thread 11 near the opening. The insulating protective sleeve 23 has a second thread 21 near the opening. The first thread 11 and the second thread 21 can be matched and sealed with each other. After the upper pole piece 1 and the lower pole piece 2 are assembled, the first thread 11 and the second thread 21 are used for realizing sealing connection. Go up utmost point core 1 and utmost point core 2 and realize screw thread sealing connection through last casing 12 and insulating protective sheath 23 down, this connection is organic (insulating protective sheath 23 is the plastics material) and inorganic (last casing 12 is the metal material) combination interface, can not produce the galvanic reaction, can guarantee that the casing is not leaked liquid and rusts. In the present embodiment, the first thread 11 is an external thread, and the second thread 21 is an internal thread, as shown in fig. 1 and 2. In other alternatives, the first thread 11 is an internal thread and the second thread 21 is an external thread, as shown in fig. 6 and 7.

In this embodiment, the upper housing 12 and the lower housing 22 may be aluminum shells or steel shells, and both may be formed by stamping, so as to reduce the forming difficulty. Further, the first thread 11 structure of the upper case 12 may be formed by a press precision thread manufacturing for improving the connection precision. The thicknesses of the upper case 12 and the lower case 22 are 0.3mm to 5mm, so that the overall volume of the battery is reduced, and the energy density of the battery is improved.

An insulating protective sleeve 23 is embedded in the lower casing 22 for insulating the internal positive electrode current collecting disc 24 and the positive electrode dry electrode layer 25 from the lower casing 22, and preventing the lower casing 22 from being positively charged. In this embodiment, the material of the insulating sheath 23 includes, but is not limited to, plastic materials such as polybutylene terephthalate, high polymer polypropylene, polyethylene terephthalate, and the like. Preferably, the thickness of the insulating protective sleeve 23 is 0.3mm-4mm, which can increase the internal space as much as possible, and facilitate the formation of an electrode with higher energy density. In the present application, the insulating protective sheath 23 and the lower housing 22 are connected together by adhesion, and the adhesive between the two includes, but is not limited to, polyacrylic acid, silica gel, AB gel, and the like.

The anode current collecting plate 13 is a conventional current collecting plate, which is fitted into the upper case 12 in contact with the bottom of the upper case 12. Anode dry electrode layer 14 is mounted on top of anode current collecting plate 13, and both are connected. The anode current collecting plate 13 is connected to the upper case 12, that is, the upper case 12 is connected to the anode, so that the upper case 12 is negatively charged. The negative current collecting disc 13 is similar to a disc, one surface of the negative current collecting disc is smooth, the other surface of the negative current collecting disc is uneven, and the smooth surface can be connected with the upper shell 12; the rugged surface can be used for connecting the negative electrode dry electrode layer 14, and the contact area is increased. Preferably, the anode current collecting plate 13 may be a copper material. The size of the anode current collecting disk 13 may be selected according to the inner size of the upper case 12.

Negative dry electrode layer 14 may be die cut from a roll of negative electrode sheet formed by a dry electrode preparation process. Wherein the die cut size is determined according to the upper case 12. Further, the negative dry electrode layer 14 may also be formed from a stack of multiple layers of die-cut negative electrode sheets. The negative electrode dry-process electrode layer 14 is formed by mixing and fiberizing a fiberized binder, a conductive agent and a negative electrode active material, and rolling at high temperature. Specifically, the negative active material includes, but is not limited to, one or more of graphite, graphene, lithium titanate, silicon carbon, and the like. The fiberized binder includes, but is not limited to, polyvinylidene fluoride (PVDF), polyvinyl pyrrolidone (PVP), polytetrafluoroethylene (PTFE), sodium carboxymethylcellulose (CMC), and the like. The conductive agent is one or more of superfine carbon powder (SP), carbon Nano Tube (CNT), vapor grown carbon fiber reinforcement (VGCF) and graphene. After uniformly mixing the binder, the conductive agent and the negative active material, stirring and fiberizing at high temperature in a screw rod to bond the binder, the negative active material and the conductive agent, and then rolling by extrusion and rolling equipment according to a set size to form a negative electrode sheet roll, wherein the rolling temperature is set to be 150-250 ℃.

Further, the lower pole core 2 further includes a positive pole post 26 and a sealing ring 27, as shown in fig. 2, 3, 5 and 7. In the present application, the bottom of the lower case 22 and the insulating protective sheath 23 are provided with mounting holes communicating with the outside. The sealing ring 27 is sleeved in the mounting hole, so that insulating layers are arranged inside and outside the mounting hole. The positive current collecting disc 24 is located at the bottom of the insulating protective sleeve 23, the positive pole column 26 is located at the outer side of the lower shell 22, and the positive current collecting disc and the positive pole column extend into the sealing ring 27 from the inner side and the outer side of the lower shell 22 to be welded. That is, the positive current collecting plate 24 extends into the sealing ring 27 from the inner side of the insulating protective sleeve 23, and the positive electrode pole 26 extends into the sealing ring 27 from the outer side of the lower casing 22 to be connected with the positive current collecting plate 24, so that the positive electrode pole 26 is positively charged. An insulating layer is formed between the positive current collecting disc 24 and the positive pole post 26 and the lower shell 22 through a sealing ring 27, so that the lower shell 22 can be prevented from being positively charged.

Preferably, the sealing ring 27 is in an i-shaped structure, so that the sealing ring 27 can be sleeved in the mounting hole, and the sealing ring 27 is arranged on the outer side of the top and the outer side of the bottom of the mounting hole. That is, the sealing rings 27 are sleeved between the positive current collecting disc 24 and the lower casing 22 and between the positive pole column 26 and the lower casing 22, so that the insulating property is realized. The positive current collecting disc 24 and the positive pole post 26 are both arranged in a protruding structure, so that the positive current collecting disc and the positive pole post can be effectively positioned and connected with the lower shell 22, the insulating protective sleeve 23 and the sealing ring 27. The positive electrode pole 26 is made of aluminum material, and the material of the sealing ring 27 includes, but is not limited to, one or more of polybutylene terephthalate, high polymer polypropylene, and polyethylene terephthalate.

The positive electrode current collecting disc 24 is a conventional current collecting disc, is assembled at the bottom of the insulating protective sleeve 23, and is in contact connection with a positive electrode pole 26 outside the lower casing 22. A positive dry electrode layer 25 is mounted above the positive collector plate 24, both connected. The positive pole 26 is positively charged, an insulating layer formed by a sealing ring 27 is arranged between the positive pole 26, the positive current collecting disc 24 and the lower shell 22, and an insulating layer formed by an insulating protective sleeve 23 is arranged between the positive dry electrode layer 25 and the lower shell 22, so that the lower shell 22 is prevented from being positively charged, and the respective charged states of the positive pole and the negative pole when the positive pole and the negative pole are not used are ensured. The positive electrode current collecting disc 24 is similar to a disc, one surface of the positive electrode current collecting disc is smooth, the other surface of the positive electrode current collecting disc is uneven, and the smooth surface can be connected with the positive electrode pole 26; the rugged surface can be used for connecting the positive electrode dry electrode layer 25, and the contact area is increased. Preferably, the positive current collecting plate 24 may be an aluminum material or a copper-aluminum alloy. The insulating protective sheath 23 is sized according to the inner dimensions of the lower housing 22.

The positive electrode dry electrode layer 25 may be formed by punching a roll of positive electrode sheet prepared by a dry electrode preparation process. Wherein the die cut size is determined according to the insulating protective sheath 23. Further, the positive electrode dry electrode layer 25 may also be formed by stacking a plurality of punched positive electrode sheets. The positive electrode dry-process electrode layer 25 is formed by mixing and fiberizing a fiberized binder, a conductive agent and a positive electrode active material and rolling at a high temperature. Specifically, the positive active material includes, but is not limited to, one or more of lithium iron phosphate (LFP), lithium Manganate (LMO), lithium Cobaltate (LCO), nickel-cobalt-manganese ternary material (NCM), and nickel-cobalt-aluminum ternary material (NCA). The fiberized binder includes, but is not limited to, polyvinylidene fluoride (PVDF), polyvinylpyrrolidone (PVP), polytetrafluoroethylene (PTFE), sodium carboxymethylcellulose (CMC), and the like. The conductive agent is one or more of superfine carbon powder (SP), carbon Nano Tube (CNT), vapor grown carbon fiber reinforcement (VGCF) and graphene. After uniformly mixing the binder, the conductive agent and the positive active material, stirring and fiberizing at high temperature in a screw rod to bond the binder, the negative active material and the conductive agent, and then rolling by extrusion and rolling equipment according to a set size to form a positive sheet roll, wherein the rolling temperature is set to be 150-250 ℃.

Further, when the battery of the present application is a solid-state battery, the upper electrode core 1 further includes a first solid-state electrolyte layer 15, and the first solid-state electrolyte layer 15 is disposed above the negative electrode dry-process electrode layer 14 in the upper case 12, as shown in fig. 1. The lower pole core 2 further comprises a second solid electrolyte layer 28, the second solid electrolyte layer 28 being arranged above the positive dry electrode layer 25 in the lower casing 22, as shown in fig. 2. The first solid electrolyte layer 15 and the second solid electrolyte layer 28 are conventional materials and may be the same solid electrolyte layer. Wherein, the first solid electrolyte layer 15 and the negative electrode dry electrode layer 14 are connected by coating adhesive glue, and the second solid electrolyte layer 28 and the positive electrode dry electrode layer 25 are connected by coating adhesive glue. The adhesive glue includes but is not limited to glue solution of polyvinylidene fluoride (PVDF), polytetrafluoroethylene (PTFE) and similar polymers, and after the adhesive glue is adhered, drying is needed. And finally, the upper pole piece 1 and the lower pole piece 2 are hermetically connected through threads to form the solid-state battery. After the upper pole piece 1 and the lower pole piece 2 are connected, the first solid electrolyte layer 15 and the second solid electrolyte layer 28 are attached to each other, thereby completing electron transmission, as shown in fig. 3.

Further, when the battery of the present application is a liquid battery, the upper electrode core 1 further includes a first separator 16, and the first separator 16 is disposed above the negative electrode dry electrode layer 14 in the upper case 12, as shown in fig. 6. The lower pole piece 2 further includes a second separator 29 and an electrolyte, the second separator 29 is disposed above the positive dry electrode layer 25 in the lower case 22, and the electrolyte (not shown in the figure) is filled in the lower case 22, as shown in fig. 7. Wherein the electrolyte is injected into the lower case 22 after the assembly of the components of the lower pole core 2 is completed. The first diaphragm 16 and the second diaphragm 29 are made of conventional materials, and may be made of the same material. The first separator 16 and the negative electrode dry electrode layer 14 are connected by coating adhesive, and the second separator 29 and the positive electrode dry electrode layer 25 are connected by coating adhesive. The adhesive glue includes but is not limited to glue solution of polyvinylidene fluoride (PVDF), polytetrafluoroethylene (PTFE) and similar polymers, and after the adhesive glue is adhered, drying is needed. And finally, hermetically connecting the upper pole piece 1 and the lower pole piece 2 through threads to form the liquid battery.

Further, when the battery of the present application is a semi-solid battery, the upper core 1 further includes a first solid electrolyte layer 15 and a first separator 16. Wherein a first solid electrolyte layer 15 and a first separator 16 are disposed above the negative dry electrode layer 14 within the upper case 12, as shown in fig. 4. The order of assembly of the first solid electrolyte layer 15 and the first separator 16 is not limited. That is, the first solid electrolyte layer 15 is connected between the negative electrode dry electrode layer 14 and the first separator 16, or the first separator 16 is connected between the negative electrode dry electrode layer 14 and the first solid electrolyte layer 15. The lower pole piece 2 further includes a second solid electrolyte layer 28, a second separator 29, and an electrolytic solution. Wherein a second solid electrolyte layer 28 and a second separator 29 are disposed above the positive electrode dry electrode layer 25 in the lower case 22, and the electrolyte (not shown in the figure) is filled in the lower case 22, as shown in fig. 5. Wherein the electrolyte is injected into the lower case 22 after the assembly of the components of the lower pole core 2 is completed. The order of assembly of the second solid electrolyte layer 28 and the second separator 29 is not limited. That is, the second solid electrolyte layer 28 is connected between the positive electrode dry electrode layer 25 and the second separator 29, or the second separator 29 is connected between the positive electrode dry electrode layer 25 and the second solid electrolyte layer 28.

The first solid electrolyte layer 15 and the second solid electrolyte layer 28 are conventional materials, and may be solid electrolyte layers of the same material. The first diaphragm 16 and the second diaphragm 29 are made of conventional materials, and may be made of the same material. The first solid electrolyte layer 15, the first diaphragm 16 and the negative electrode dry electrode layer 14 are connected with each other by coating adhesive glue, and the second solid electrolyte layer 28, the second diaphragm 29 and the positive electrode dry electrode layer 25 are connected with each other by coating adhesive glue. The adhesive glue includes but is not limited to glue solution of polyvinylidene fluoride (PVDF), polytetrafluoroethylene (PTFE) and similar polymers, and after the adhesive glue is adhered, drying is needed. And finally, hermetically connecting the upper pole piece 1 and the lower pole piece 2 through threads to form the semi-solid battery.

In other embodiments, the electrolyte may be injected into the upper case 12 after the assembly of the components of the upper core 1 is completed during the preparation of the liquid battery and the semi-solid battery.

Further, the battery of this application still includes sealant layer. The sealing glue layer is formed by coating a sealing glue on the outer sides of the upper pole piece 1 and the lower pole piece 2 after being connected through threads. Sealants include, but are not limited to, asphalt mastic and the like. And the outside of the threaded connection part is coated with sealant, so that liquid leakage in the shell can be further avoided.

In the assembly process of the upper pole core and the lower pole core of the battery, the welding process of the electrode lugs is omitted, the dry electrode layer is directly welded with the current collecting disc, the current collecting disc is free of current collectors, the problems of burrs, self-discharge, corrosion of the current collectors and the like can be solved, meanwhile, the current collecting disc is directly contacted with the dry electrode layer, and the heat transfer efficiency and the electricity transfer efficiency of the battery are higher. The upper pole core and the lower pole core both adopt dry electrode layers, a wet electrode preparation process is not needed, and the energy density and the safety performance of the battery are improved. Meanwhile, the upper pole piece and the lower pole piece are connected through threads, a laser sealing welding process is not needed, and the problems of welding heat affected zones, welding metal dust and high welding cost of the existing welding process are solved.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included within the protection scope of the present invention.

Claims (8)

1. A battery, comprising:

the anode core (1) comprises an upper shell (12) with a first thread (11), an anode current collecting disc (13) and an anode dry electrode layer (14), wherein the anode current collecting disc (13) and the anode dry electrode layer (14) are sequentially assembled in the upper shell (12);

the lower pole core (2) comprises a lower shell (22), an insulating protective sleeve (23), a positive pole current collecting disc (24) and a positive pole dry electrode layer (25), wherein the insulating protective sleeve (23) is embedded in the lower shell (22), the insulating protective sleeve (23) is provided with a second thread (21), and the positive pole current collecting disc (24) and the positive pole dry electrode layer (25) are sequentially assembled in the lower shell (22) and the insulating protective sleeve (23);

wherein the upper pole piece (1) and the lower pole piece (2) are connected in a sealing manner through the first thread (11) and the second thread (21).

2. The battery according to claim 1, wherein the lower pole piece (2) further comprises:

the positive pole column (26) is positioned on the outer side of the lower shell (22), and part of the positive pole column (26) and part of the positive current collecting disc (24) penetrate through the insulating protective sleeve (23) and are welded with the lower shell (22);

and the sealing ring (27) is sleeved on the positive current collecting disc (24) and between the lower shells (22) and between the positive pole column (26) and the lower shells (22).

3. The battery according to claim 2, wherein the upper pole core (1) further comprises a first solid state electrolyte layer (15) disposed within the upper casing (12) and above the negative dry electrode layer (14);

the lower pole core (2) further comprises a second solid electrolyte layer (28) which is arranged in the lower shell (22) and is positioned above the positive dry electrode layer (25);

after the upper pole piece (1) and the lower pole piece (2) are connected in a sealing mode, the first solid electrolyte layer (15) and the second solid electrolyte layer (28) are connected in a fitting mode.

4. The battery according to claim 2 or 3, characterized in that the upper pole core (1) further comprises a first separator (16) disposed within the upper casing (12) and above the negative dry electrode layer (14);

the lower pole core (2) further comprises a second diaphragm (29) and electrolyte, the second diaphragm (29) is arranged in the lower shell (22) and located above the positive electrode dry electrode layer (25), and the electrolyte is filled in the lower shell (22).

5. The battery according to claim 1, wherein the upper case (12) and the lower case (22) are aluminum cases or steel cases, the upper case (12) and the lower case (22) have a thickness of 0.3mm to 5mm, and the insulating protective sheath (23) has a thickness of 0.3mm to 4mm.

6. The battery according to claim 2, wherein the negative current collecting plate (13) is copper, the positive current collecting plate (24) is aluminum or copper-aluminum alloy, and the positive electrode post (26) is aluminum.

7. The battery according to claim 1, wherein the negative electrode dry electrode layer (14) is formed by high-temperature roll pressing after fiberization of a mixture of a fiberized binder, a conductive agent and a negative electrode active material, the positive electrode dry electrode layer (25) is formed by high-temperature roll pressing after fiberization of a mixture of a fiberized binder, a conductive agent and a positive electrode active material, the positive electrode dry electrode layer (25) is formed by stacking a plurality of positive electrode sheets, and the negative electrode dry electrode layer (14) is formed by stacking a plurality of negative electrode sheets.

8. The battery according to claim 1, further comprising a sealant layer formed by coating a sealant on the outer side of the upper pole piece (1) and the lower pole piece (2) after being screwed.

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