CN218525645U

CN218525645U - Battery cell shell, battery cell and large-capacity battery

Info

Publication number: CN218525645U
Application number: CN202222289933.XU
Authority: CN
Inventors: 陈孟奇; 雷政军; 刘毅
Original assignee: Shaanxi Olympus Power Energy Co Ltd
Current assignee: Shaanxi Olympus Power Energy Co Ltd
Priority date: 2022-08-29
Filing date: 2022-08-29
Publication date: 2023-02-24
Anticipated expiration: 2032-08-29

Abstract

The utility model discloses an electricity core casing, electric core and large capacity battery, be provided with first through-hole on the electricity core casing, still be provided with the cover first through-hole is followed the pipeline that electricity core casing thickness direction extends, the pipeline is provided with the second through-hole on the body, first through-hole with the second through-hole link up. An electrolyte sharing channel of the cell group is formed by splicing pipelines, so that cells in a large-capacity battery can be in a uniform environment, the uniformity and the yield are obviously improved, and the electrolyte can be supplemented and replaced in the later period; the explosion venting channel of the electric core group is formed through the splicing pipeline, the thermal runaway smoke is guided out, and the explosion venting safety is improved.

Description

Battery cell shell, battery cell and high-capacity battery

Technical Field

The utility model relates to a battery technology field especially relates to an electricity core casing, electricity core and large capacity battery.

Background

The square battery of the maximum capacity is 300Ah in the lithium cell on the existing market, receives the influence of battery capacity, and the lithium cell need carry out the series-parallel connection of a plurality of batteries when the energy storage is used for the hookup accessories is various, and the hookup step is complicated, loaded down with trivial details, and the quantity of battery management system and wire rod, battery box is very big, and the energy storage cost is therefore high.

How to combine small-capacity battery cores into large-capacity batteries, and enable the battery cells to have stronger safety and higher yield is a problem to be solved, wherein the problems of treatment of thermal runaway smoke and electrolyte sharing are particularly prominent.

At present, a plurality of electric cores are mainly connected in parallel into a large box body to form a large-capacity battery, chinese patent CN101286577A discloses a high-power lithium ion battery, and the high-power lithium ion power battery comprises a plurality of parallel monomer electric cores, each monomer electric core comprises a positive plate, a negative plate, a diaphragm and 2-8 positive electrode lugs and negative electrode lugs, the positive electrode lugs and the positive plates are integrated and are cut out on a current collector aluminum foil of the positive plate, the negative electrode lugs and the negative plates are integrated and are cut out on a current collector copper foil of the negative plate, the positive electrode lugs of all the monomer electric cores are welded on the positive electrode lug, and all the negative electrode lugs are welded on the negative electrode lug to form the large-capacity battery. Chinese patent CN111370775A discloses a high-capacity battery and a manufacturing method thereof, the battery comprises an aluminum shell, a cylindrical winding core, a positive cover plate, a negative cover plate, a positive bus sheet, a negative bus sheet, a silica gel sheet and a battery bracket, wherein the cylindrical winding core consists of a winding core body and a metal cylindrical tube and is of an electrodeless ear structure; a cylindrical roll core is arranged in the aluminum shell, and the positive end and the negative end of the cylindrical roll core are welded with the positive and negative converging sheets to form a roll core group; the battery is used for forming a large-capacity battery with a plurality of winding cores connected in parallel.

The capacity of the large-capacity battery is improved by connecting the battery cells in parallel, but the quality of each battery cell cannot be effectively controlled before the large battery is formed, and the yield of the large battery cannot be improved.

SUMMERY OF THE UTILITY MODEL

For quality control problem, the solution electrolyte sharing when solving large capacity battery production and let out and explode the safety problem, the utility model discloses a technical scheme be provide an electricity core casing, be provided with first through-hole on the electricity core casing, still be provided with the cover first through-hole is followed the pipeline that electricity core casing thickness direction extends, the pipeline is provided with the second through-hole on the body, first through-hole with the second through-hole link up.

Furthermore, the first through hole or the second through hole is provided with a sealing film, and the sealing film is dissolved when meeting the electrolyte or is opened under the action of external force.

Further, a traction ring is arranged on the sealing film, and the traction ring is pulled to form an opening under the traction of external force so as to inject electrolyte.

Further, the sealing membrane is provided with a weak point.

Furthermore, when the seal membrane is soluble in electrolyte, the seal membrane towards one side of electric core shell inside still is provided with the protection film that is insoluble in electrolyte, works as after the seal membrane is dissolved in electrolyte, the protection film drops thereupon.

Further, the battery cell shell comprises an upper cover plate, a lower cover plate and a barrel, wherein the upper cover plate is provided with a positive pole and a negative pole, and the first through hole is formed in the lower cover plate; the lower cover plate is also provided with a first battery cell mounting seat along the thickness direction of the shell; and a second battery cell mounting seat is further arranged on the side wall of the barrel along the height direction of the shell.

Further, the lower cover plate and the pipeline are integrally formed into an aluminum extruded piece; the cylinder body is an aluminum extrusion piece; and the lower cover plate is fixed with the cylinder body through laser welding.

Furthermore, a plurality of radiating grooves are formed in the surface of the cylinder body.

In order to solve the above problem, the utility model discloses a technical scheme be provide an electric core, electric core includes electric core shell.

In order to solve the above problem, the utility model discloses a technical scheme be provide a large capacity battery, include the parallelly connected electric core group of constituteing of electric core.

Furthermore, the battery cores are connected through a connecting piece, the connecting piece is connected with the pipelines of the two adjacent battery cores, and the inside of the connecting piece is hollow and communicated.

Furthermore, two ends of the connecting piece comprise connecting nozzles, two ends of the pipeline are provided with connecting ports, and the connecting nozzles are embedded in the connecting ports and are connected in a sealing manner; or

The connecting piece both ends include the connector, the pipeline both ends set up the connection mouth, the connection mouth inlay in sealing connection in the connection mouth.

Furthermore, the connecting nozzle is a conical nozzle, and the connecting nozzle is in interference fit with the connecting port.

Further, the connecting mouth is in threaded connection with the connecting port.

Furthermore, the cell shell is internally provided with a soft package cell, the pipeline is spliced to form the explosion venting channel of the cell core group, and at least one end of the explosion venting channel is provided with a smoke outlet.

Further, built-in electrode subassembly of electricity core casing or set up open-ended soft packet of electricity core, the pipeline concatenation forms during the electrolyte shared channel of electricity core group, first through-hole or second through-hole are provided with the seal membrane, the seal membrane is dissolved or is opened under the exogenic action when meeting electrolyte, just electrolyte shared channel one end is equipped with lets out and explodes the mechanism, and the other end is provided with the shutoff piece.

Furthermore, the explosion venting mechanism is provided with a detachable port, and the port is used for injecting electrolyte into the electrolyte sharing channel. The utility model has the advantages that:

the battery cells are connected in parallel to form a high-capacity battery, the electrolytes of all the battery cells are communicated through a shared pipeline, each battery cell can be subjected to capacity grading before assembly, and the yield and the safety of the high-capacity battery are effectively improved. The pipeline and the integrated design of the battery cell shell enable the integration level of the battery cell shell to be higher, the assembly procedure to be simplified, the structure to be simple and the using effect to be good.

Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.

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 described below, it is obvious that the drawings in the description below are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a cell casing in an embodiment;

fig. 2 is a schematic structural diagram of a cell casing in an embodiment;

fig. 3a is a schematic cross-sectional structure diagram of a cell casing in an embodiment;

fig. 3b is a schematic cross-sectional structure diagram of a lower cover plate of a cell casing in an embodiment;

fig. 3c is a schematic cross-sectional view of a lower cover plate of the cell casing in an embodiment;

fig. 4 is a schematic structural diagram of a cell casing connector in an embodiment;

fig. 5 is a schematic structural diagram of a cell casing in an embodiment

Fig. 6 is a schematic structural diagram of a cell casing in an embodiment;

fig. 7a is a schematic cross-sectional structure diagram of a cell casing in an embodiment;

fig. 7b is a schematic cross-sectional structure view of a lower cover plate of a cell casing in an embodiment;

fig. 7c is a schematic cross-sectional structure diagram of a lower cover plate of a cell casing in an embodiment;

fig. 8 is a schematic structural diagram of a cell casing in an embodiment;

fig. 9 is a schematic sectional view of a cell casing in an embodiment;

FIG. 10 is a schematic structural view of the electric core pack in one embodiment;

fig. 11 is a schematic structural view of a large-capacity battery in one embodiment.

Reference numerals: 11-upper cover plate 12-lower cover plate 121-first through hole 13-barrel 14-pipeline 141-connecting port 142-second through hole 143-explosion venting component 17-connecting piece 171-connecting mouth 18-sealing membrane 181-traction ring 191-first cell mounting seat 192-second cell mounting seat 193-heat dissipation groove 201-mounting bracket 202-mounting piece

Detailed Description

While embodiments of the invention have been disclosed above, it is not intended that they be limited to the applications set forth in the specification and examples. It can be applicable to all kinds of being fit for the utility model's field completely. Additional modifications will readily occur to those skilled in the art. The invention is therefore not to be limited to the specific details and illustrations shown and described herein, without departing from the general concept defined by the claims and their equivalents.

In order to make the objects, technical solutions and advantages of the present application more clearly understood, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.

Hereinafter, a cell case, a cell, and a large capacity battery according to the present application are specifically disclosed in detail with reference to the accompanying drawings as appropriate. But a detailed description thereof will be omitted. For example, detailed descriptions of well-known matters and repetitive descriptions of actually the same structures may be omitted. This is to avoid unnecessarily obscuring the following description, and to facilitate understanding by those skilled in the art. The drawings and the following description are provided for those skilled in the art to fully understand the present application, and are not intended to limit the subject matter recited in the claims.

All embodiments and alternative embodiments of the present application may be combined with each other to form new solutions, if not specifically stated. All technical and optional features of the present application may be combined with each other to form new solutions, if not specifically mentioned.

The terms "comprises" and "comprising" as used herein mean either open or closed unless otherwise specified. For example, "comprising" and "comprises" may mean that other components not listed may also be included or included, or that only listed components may be included or included.

It is understood that relational terms such as "first," "second," and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions.

Example 1

As shown in fig. 1 and fig. 2, a schematic structural diagram of a cell casing is shown. A plurality of soft-packaged battery cores are arranged in the battery core shell. The cell shell is provided with an upper cover plate 11, a lower cover plate 12, a cylinder 13 and a pipeline 14. The upper cover plate 11 is provided with a positive pole column and a negative pole column of the battery.

As shown in fig. 3a to fig. 3c, the lower cover plate 12 is provided with a first through hole 121, and is further provided with a pipeline 14 covering the first through hole 121 and extending along the thickness direction of the cell casing, a second through hole 142 is provided on a pipe body of the pipeline 14, and the first through hole 121 is communicated with the second through hole 142. The first through hole 121 and the second through hole 142 are circular or elongated through holes, respectively.

The electric core group that the electric core casing was used for built-in soft-packaged electric core and constituteed large capacity battery in this embodiment, at this moment, the way of exploding is leaked in what form electric core group through the pipeline 14 concatenation on the electric core casing between the electric core to it is equipped with the exhanst gas outlet to let out to explode passageway one end. After forming the explosion venting channel by pipeline splicing, when any electric core is out of thermal runaway, the thermal runaway flue gas enters the pipeline 14 after passing through the first through hole 121 and the second through hole 142, and is guided by the pipeline 14 to be discharged to a specified position. One end of the explosion venting channel is connected with a thermal runaway flue gas treatment device, and the thermal runaway flue gas is cooled and adsorbed or ignited.

As shown in fig. 3 a-3 c and 4, in some embodiments, the lines 14 are interconnected by a connector 17. The external dimensions of the connecting piece 17 correspond to the external dimensions of the pipelines 14, which contributes to improving the stability of the connection between the pipelines 14.

In some embodiments, the connecting member 17 includes two connecting nozzles 171, the connecting ports 141 are disposed at two ends of the pipeline 14, and the connecting nozzles 171 are embedded in the connecting ports 141 to be hermetically connected; or the connecting piece comprises two connecting ports, the two ends of the pipeline are provided with connecting nozzles, and the connecting nozzles are embedded in the connecting ports for sealing connection. The molding of connecting mouth is preferably little toper, is convenient for insert in the connector, and preferred connecting mouth and connector interference fit, rivet between connecting mouth and the connector, or threaded connection between connecting mouth and the connector.

As shown in fig. 1 and 2, in some embodiments, the lower cover plate 12 is further provided with a first cell mounting seat 191 in the thickness direction of the casing; the casing side wall is also provided with a second cell mounting seat 192 along the height direction of the casing. The mounting base on the electric core group is a base for fixing when the electric core group is mounted into a large-capacity battery, and a threaded hole for fixing is formed in the base. The surface of the electric core shell is provided with a plurality of radiating grooves 193 extending along the height direction of the shell, so that the electric core shell can radiate heat conveniently. The lower cover plate 12 and the pipe 14 are formed as an integral aluminum extrusion, and the first through hole and the second through hole can be combined into a through hole. The cylinder body 13 is also an aluminum extrusion piece, the lower cover plate 12 and the cylinder body 13 are fixed by laser welding, and the fixing mode is economical, convenient and good in effect.

Example 2

As shown in fig. 1 and fig. 2, are schematic structural diagrams of a cell casing. An electrode assembly is placed in the cell shell, or a soft-package cell with an opening is placed in the cell shell, namely, the opening for injecting electrolyte is formed in the soft-package cell shell, and the cell shell is provided with an upper cover plate 11, a lower cover plate 12, a barrel 13 and a pipeline 14. The upper cover plate 11 is provided with a positive pole column and a negative pole column of the battery.

As shown in fig. 7a to 7c, the lower cover plate 12 is provided with a first through hole 121, and is further provided with a pipeline 14 covering the first through hole 121 and extending along the thickness direction of the cell casing, a second through hole 142 is provided on a pipe body of the pipeline 14, and the first through hole 121 is communicated with the second through hole 142. The first through hole 121 and the second through hole 142 are circular or elongated through holes, respectively.

In some embodiments, the conduit 14 is disposed on the barrel of the cell casing and extends in the thickness direction of the cell casing.

In some embodiments, the conduit 14 is disposed on an upper cover plate of the cell casing and extends in a thickness direction of the cell casing.

The electricity core group that the battery core casing was used for built-in electrode subassembly or had set up the open-ended laminate polymer core in this embodiment to constitute the large capacity battery, at this moment, the electrolyte shared channel that forms the electricity core group through the 14 concatenations of the pipeline on the electricity core casing between the electric core, and electrolyte shared channel one end is equipped with annotates liquid mechanism. After forming electrolyte shared channel through the pipeline concatenation, will loop through second through-hole 142 and first through-hole 121 entering electric core casing through the electrolyte that annotate injection mechanism and pour into, make all electric cores in the electric core group all be in under the unified electrolyte environment, can effectively improve the homogeneity of electric core group. Annotate liquid mechanism and can also be used for the electric core group fluid infusion, trade liquid, use when the electric core group and exceed certain years, the loss will take place for electrolyte, take out and change new electrolyte this moment or directly supply new electrolyte and all help prolonging the life of large capacity battery. When the electrolyte is used under the conventional condition, one end of the electrolyte sharing channel is provided with the explosion venting mechanism, any electric core in the electric core group is out of control due to heat, the generated smoke gas out of control due to heat sequentially passes through the first through hole 121 and the second through hole 142 and then is collected into the pipeline 14, the smoke gas is discharged to a specified place through the explosion venting mechanism to be effectively treated, and the smoke gas out of control due to heat is cooled and adsorbed or is ignited and then is discharged.

As shown in fig. 4, in some embodiments, the lines 14 are interconnected by a connector 17. The external dimensions of the connecting piece 17 are comparable to those of the pipelines 14, which contributes to improving the stability of the connection between the pipelines 14.

In some embodiments, the connection member 17 includes two connection nozzles 171, the connection ports 141 are disposed at two ends of the pipeline 14, and the connection nozzles 171 are embedded in the connection ports 141 to be hermetically connected; or the connecting piece comprises two connecting ports, the two ends of the pipeline are provided with connecting nozzles, and the connecting nozzles are embedded in the connecting ports to be connected in a sealing way. The molding of being connected the mouth is preferably little toper, is convenient for insert the connector in, and preferred connection mouth and connector interference fit, rivet between connection mouth and the connector, perhaps connect threaded connection between mouth and the connector.

As shown in fig. 6-7 c, in some embodiments, a sealing film 18 is disposed on the first through-hole 121 or the second through-hole 142. The sealing film 18 serves to protect the electrode assembly or the pouch having an opening provided in the case from air before the battery is formed into a capacitor, or serves as a venting membrane. When a large-capacity battery is formed, the sealing film 18 is opened to form an opening in the battery cell shell, so that electrolyte can enter the battery cell shell, and the effect of communicating the electrolytes of a plurality of battery cells is achieved.

As shown in fig. 8 and 9, the external force for opening the sealing film 18 may be a special tool, or a traction ring 181 and a weak point are provided on the sealing film 18, the traction ring 181 is uniformly threaded by a traction wire when the cell pack is assembled, during liquid injection, by pulling the traction wires of all traction rings 181 threaded, the sealing film 18 of each cell is torn from the weak point, the electrolyte uniformly enters all cells in the cell pack, and this operation should be completed in a vacuum environment to avoid the cell pack from being exposed to the air.

In some embodiments, a protective film is attached to the sealing film 18, and the sealing film 18 can be dissolved when meeting the electrolyte, in order to avoid the electrolyte in the electric core dissolving the sealing film 18 in advance, a protective film is attached to the sealing film 18, when the electrolyte needs to be injected, the electrolyte enters the electrolyte sharing channel, and the protective film attached to the sealing film 18 falls off when meeting the electrolyte to enable the electrolyte to enter the electric core shell. The mode avoids using other tools, has low requirements on the operating environment, and can ensure that the electrolyte and the electrode assembly are not exposed in the air as long as the electrolyte sharing channel is sealed in time after the electrolyte is injected.

As shown in fig. 1 and 2, in some embodiments, the lower cover plate 12 is further provided with a first cell mounting seat 191 in the thickness direction of the casing; the side wall of the casing is further provided with a second cell mounting seat 192 along the height direction of the casing. The mounting base on the electric core group is a base for fixing when the electric core group is mounted into a large-capacity battery, and a threaded hole for fixing is formed in the base. The surface of the electric core shell is provided with a plurality of heat dissipation grooves 193 extending along the height direction of the shell, so that heat dissipation is facilitated for the electric core shell. The lower cover plate 12 and the pipeline 14 are integrally formed aluminum extruded parts, the cylinder body 13 is also an aluminum extruded part, and the lower cover plate 12 and the cylinder body 13 are fixed by laser welding. The fixing mode is economical, convenient and fast and has good effect.

As shown in fig. 10, in normal use, the explosion venting assembly 143 is installed at one end of the pipeline 14, and the other end is plugged with a plugging member. Explosion venting assembly 143 is also provided with a removable port for injecting electrolyte into the electrolyte reservoir. After the liquid injection is finished, the explosion venting assembly 143 is restored to the normal use state.

Example 3

This embodiment provides an electric core, places a plurality of soft packet of electricity core in the electricity core casing. As shown in fig. 1 and fig. 2, a schematic structural diagram of a cell casing is shown. The cell shell is provided with an upper cover plate 11, a lower cover plate 12, a cylinder 13 and a pipeline 14. The upper cover plate 11 is provided with a positive pole and a negative pole of the battery.

The electric core group that the electric core casing was used for built-in laminate polymer core and constituteed large capacity battery in this embodiment, at this moment, the pipeline 14 concatenation on through the electric core casing between the electric core forms the letting out of electric core group and explodes the passageway to let out and explode passageway one end and be equipped with the exhanst gas outlet. After forming the explosion venting channel through the pipeline splicing, when any electric core is out of thermal control, the thermal control flue gas enters the pipeline 14 through the first through hole 121 and the second through hole 142, and is guided to be discharged to a specified position by the pipeline 14. One end of the explosion venting channel is connected with a thermal runaway flue gas treatment device, and the thermal runaway flue gas is cooled and adsorbed or ignited.

In some embodiments, the connecting member 17 includes two connecting nozzles 171, the connecting ports 141 are disposed at two ends of the pipeline 14, and the connecting nozzles 171 are embedded in the connecting ports 141 to be hermetically connected; or the connecting piece comprises two connecting ports, the two ends of the pipeline are provided with connecting nozzles, and the connecting nozzles are embedded in the connecting ports for sealing connection. The molding of being connected the mouth is preferably little toper, is convenient for insert the connector in, and preferred connection mouth and connector interference fit, rivet between connection mouth and the connector, perhaps connect threaded connection between mouth and the connector.

As shown in fig. 1 and 2, in some embodiments, the lower cover plate 12 is further provided with a first cell mounting seat 191 in the thickness direction of the casing; the casing side wall is also provided with a second cell mounting seat 192 along the height direction of the casing. The mounting base on the electric core group is a base for fixing when the electric core group is mounted into a large-capacity battery, and a threaded hole for fixing is formed in the base. The surface of the electric core shell is provided with a plurality of radiating grooves 193 extending along the height direction of the shell, so that the electric core shell can radiate heat conveniently. The lower cover plate 12 and the pipe 14 are formed as an integral aluminum extrusion, and the first through hole and the second through hole can be combined into a through hole. The cylinder body 13 is also an aluminum extrusion piece, the lower cover plate 12 and the cylinder body 13 are fixed through laser welding, and the fixing mode is economical, convenient and fast and good in effect.

Example 4

The embodiment provides a battery cell, an electrode assembly is arranged in a battery cell shell or a plurality of soft-package battery cells with openings are arranged in the battery cell shell, namely, the openings for injecting electrolyte are arranged on the soft-package battery cell shell. As shown in fig. 1 and fig. 2, are schematic structural diagrams of a cell casing. The cell shell is provided with an upper cover plate 11, a lower cover plate 12, a cylinder 13 and a pipeline 14. The upper cover plate 11 is provided with a positive pole column and a negative pole column of the battery.

The electric core casing is used for built-in electrode subassembly or has set up open-ended laminate polymer core in this embodiment to constitute the electric core group that large capacity battery used, at this moment, the electrolyte shared channel of formation electric core group is spliced through pipeline 14 on the electric core casing between the electric core, and electrolyte shared channel one end is equipped with annotates liquid mechanism. After forming electrolyte shared channel through the pipeline concatenation, will loop through second through-hole 142 and first through-hole 121 entering electric core casing through the electrolyte that annotate injection mechanism and pour into, make all electric cores in the electric core group all be in under the unified electrolyte environment, can effectively improve the homogeneity of electric core group. Annotate liquid mechanism and can also be used for the electric core group fluid infusion, trade the liquid, use when the electric core group and exceed certain age, the loss will take place for electrolyte, take out electrolyte this moment and change new electrolyte or directly supply new electrolyte and all help prolonging the life of large capacity battery. When the electrolyte is used under the conventional condition, one end of the electrolyte sharing channel is provided with the explosion venting mechanism, any electric core in the electric core group is out of control due to heat, the generated smoke gas out of control due to heat sequentially passes through the first through hole 121 and the second through hole 142 and then is collected into the pipeline 14, the smoke gas is discharged to a specified place through the explosion venting mechanism to be effectively treated, and the smoke gas out of control due to heat is cooled and adsorbed or is ignited and then is discharged.

As shown in fig. 4, in some embodiments, the tubes 14 are interconnected by a connector 17. The external dimensions of the connecting piece 17 correspond to the external dimensions of the pipelines 14, which contributes to improving the stability of the connection between the pipelines 14.

In some embodiments, the connecting member 17 includes two connecting nozzles 171, the connecting ports 141 are disposed at two ends of the pipeline 14, and the connecting nozzles 171 are embedded in the connecting ports 141 to be hermetically connected; or the connecting piece comprises two connecting ports, the two ends of the pipeline are provided with connecting nozzles, and the connecting nozzles are embedded in the connecting ports to be connected in a sealing way. The molding of connecting mouth is preferably little toper, is convenient for insert in the connector, and preferred connecting mouth and connector interference fit, rivet between connecting mouth and the connector, or threaded connection between connecting mouth and the connector.

As shown in fig. 6-7 c, in some embodiments, a sealing film 18 is disposed on the first through-hole 121 or the second through-hole 142. The sealing film 18 serves to protect the electrode assembly or the pouch having an opening provided in the case from air before the battery is formed into a capacitor, or serves as a venting membrane. When a large-capacity battery is formed, the sealing film 18 is opened, so that the electric core shell forms an opening, electrolyte can enter the electric core shell, and the effect of the intercommunication of the electrolyte of a plurality of electric cores is achieved.

As shown in fig. 8 and 9, the external force for opening the sealing film 18 may be a special tool, or a traction ring 181 and a weak point are provided on the sealing film 18, the traction ring 181 is uniformly threaded by a traction wire when the cell pack is assembled, during liquid injection, by pulling the traction wires of all the traction rings 181 threaded, the sealing film 18 of each cell is torn from the weak point, the electrolyte uniformly enters all the cells in the cell pack, and this operation should be completed in a vacuum environment to avoid the cell pack from being exposed to the air.

As shown in fig. 1 and 2, in some embodiments, the lower cover plate 12 is further provided with a first cell mounting seat 191 in the thickness direction of the casing; the casing side wall is also provided with a second cell mounting seat 192 along the height direction of the casing. The mounting base on the electric core group is a base for fixing when the electric core group is mounted into a large-capacity battery, and a threaded hole for fixing is formed in the base. The surface of the electric core shell is provided with a plurality of heat dissipation grooves 193 extending along the height direction of the shell, so that heat dissipation is facilitated for the electric core shell. The lower cover plate 12 and the pipeline 14 are integrally formed aluminum extruded parts, the cylinder body 13 is also an aluminum extruded part, and the lower cover plate 12 and the cylinder body 13 are fixed by laser welding. The fixing mode is economical, convenient and fast and has good effect.

Example 5

As shown in fig. 10 and 11, the present embodiment provides a large-capacity battery, which includes a plurality of cell packs formed by connecting the cells described in embodiment 3 or 4 in parallel. The electric core is fixedly mounted on the electric core fixing frame 201 through the first electric core mounting seat 191 and the second electric core mounting seat 192, and is connected through the mounting part 202, so that the electric core is convenient to carry and fix.

The above summary of the present application is not intended to describe each disclosed embodiment or every implementation of the present application. The following description more particularly exemplifies illustrative embodiments. At various points throughout this application, guidance is provided through a list of embodiments that can be used in various combinations. In each instance, the list is provided only as a representative group and should not be construed as exhaustive.

Claims

1. The utility model provides an electricity core casing, its characterized in that, be provided with first through-hole on the electricity core casing, still be provided with cover first through-hole and follow the pipeline that electricity core casing thickness direction extended, the pipeline is provided with the second through-hole on the body, first through-hole with the second through-hole link up.

2. The cell casing of claim 1, wherein the first or second through-hole is provided with a sealing membrane that dissolves when exposed to an electrolyte or is opened by an external force.

3. The cell casing of claim 2, wherein the sealing film is provided with a pulling ring, and the pulling ring is pulled apart under external force pulling to form an opening for injecting the electrolyte.

4. The cell casing of claim 3, wherein the sealing membrane is provided with a weakness.

5. The cell casing of claim 2, wherein when the sealing film is soluble in an electrolyte, a protective film insoluble in the electrolyte is further disposed on a side of the sealing film facing the inside of the cell casing, and when the sealing film is soluble in the electrolyte, the protective film is detached.

6. The cell casing of claim 1, wherein the cell casing comprises an upper cover plate, a lower cover plate and a barrel, the upper cover plate is provided with a positive pole and a negative pole, and the first through hole is formed in the lower cover plate; the lower cover plate is also provided with a first battery cell mounting seat along the thickness direction of the shell; and a second battery cell mounting seat is further arranged on the side wall of the cylinder body along the height direction of the shell.

7. The cell casing of claim 6, wherein the lower cover plate and the pipeline are an integrally formed aluminum extrusion; the cylinder body is an aluminum extrusion piece; and the lower cover plate is fixed with the cylinder body through laser welding.

8. The cell casing of claim 6, wherein the barrel surface is provided with a plurality of heat dissipation grooves.

9. A battery cell, characterized in that the battery cell comprises a cell casing according to any of claims 1 to 8.

10. A large capacity battery comprising a plurality of cell groups of the cells of claim 9 connected in parallel.

11. The high capacity battery of claim 10, wherein the battery cells are connected by a connecting piece, the connecting piece is connected with the pipelines of two adjacent battery cells, and the inside of the connecting piece is hollow and through.

12. The high-capacity battery as claimed in claim 11, wherein the connecting member includes connecting mouths at both ends thereof, the pipe has connecting ports at both ends thereof, and the connecting mouths are embedded in the connecting ports for sealing connection; or

13. The large capacity battery as recited in claim 12, wherein the connection nozzle is a tapered nozzle, and the connection nozzle is interference-fitted with the connection port.

14. The large capacity battery as claimed in claim 12, wherein the connection mouth is screw-coupled to the connection port.

15. The high-capacity battery as claimed in claim 10, wherein a soft-package cell is disposed in the cell casing, the pipelines are spliced to form an explosion venting channel of the cell pack, and at least one end of the explosion venting channel is provided with a smoke outlet.

16. The high capacity battery of claim 10, wherein the cell casing is provided with an electrode assembly or a soft package cell with an opening, when the pipelines are spliced to form the electrolyte sharing channel of the cell pack, the first through hole or the second through hole is provided with a sealing membrane, the sealing membrane is dissolved when meeting the electrolyte or is opened under the action of external force, and one end of the electrolyte sharing channel is provided with an explosion venting mechanism, and the other end of the electrolyte sharing channel is provided with a plugging piece.

17. The large capacity battery as recited in claim 16, wherein the explosion venting mechanism is provided with a detachable port for injecting the electrolyte to the electrolyte sharing channel.