CN217114564U - High-capacity single battery - Google Patents

Abstract

The application discloses large capacity battery cell, including electric core group, electric core box, current collection post and heat controlling means, the electric core group of this battery is lamination formula or coiling formula, the anodal and the negative pole of electric core group are located two relative faces of electric core group respectively, the current collection post sets up in electric core box outside to be connected through the positive negative pole of connecting piece and electric core, the current collection post not with the electrolyte contact of battery, set up heat controlling means on the current collection post. The utility model provides a mass flow post sets up in the outside of electric core box, the electrolyte in the contactless electric core box, thereby can effectively control the volume of electric core box can reduce the filling amount and the utilization efficiency of electrolyte, avoided too much and the various danger that the overheated messenger electrolyte of mass flow post of electrolyte became invalid and arouse, set up the mass flow post in electric core box outside can be very convenient simultaneously and carry out heat control to the mass flow post, electric core box has still set up the casing bulging that changes in order to solve high capacity battery operation in-process internal pressure of operation protection device simultaneously, adverse effect such as material fatigue, thereby can improve high capacity battery's security and life.

Description

High-capacity single battery

Technical Field

The application relates to the technical field of batteries, in particular to a high-capacity lithium ion single battery.

Background

The high-capacity lithium battery is one of the developing directions of the lithium battery, and can be applied to the fields of energy storage and power batteries. Compared with a small-capacity battery, the large-capacity battery saves a set of control device for each battery or battery pack, and actually, although the cost of a single battery of the large-capacity battery is increased, other related matched equipment is greatly reduced, so that the cost is reduced in general, and the market competition is facilitated.

The application of China to high-capacity energy storage batteries is at the beginning stage at present, and the production of high-capacity single batteries is restricted by a plurality of factors, including high requirements on production equipment, high requirements on product consistency, high product rejection rate, concentrated heat production in the application process, large heat release and the like.

CN202020455079.8 provides a lithium ion battery, a battery module and a battery pack. The electric core group includes the edge a plurality of electric cores that lithium ion battery length direction parallel set up, every electric core all has anodal utmost point ear and negative pole utmost point ear, anodal utmost point ear with negative pole utmost point ear is located respectively the both sides of electric core, a plurality of anodal utmost point ears of a plurality of electric cores link to each other through first connection piece, and a plurality of negative pole utmost point ears of a plurality of electric cores link to each other through the second connection piece, be equipped with anodal utmost point post and negative pole post on the casing, first connection piece links to each other with anodal utmost point post, the second connection piece links to each other with negative pole post. The utility model discloses a lithium ion battery has solved the multilayer utmost point ear welding problem when a plurality of electric cores are parallelly connected, reduces battery cell thickness, increases battery specific surface area, but this patent is battery pack scheme of group, does not disclose big battery cell.

CN201711469261.8 provides a super large capacity battery cell and preparation method thereof, the battery includes battery case and a plurality of battery utmost point group, connect in parallel through first conducting material between the anodal of battery utmost point group, connect in parallel through second conducting material between the negative pole, a plurality of battery utmost point group locates in the battery case, the battery case outside is equipped with a plurality of positive post and negative pole post, positive post and negative pole post pass battery case, the bottom and the first conducting material of positive post are connected, the bottom and the second conducting material of negative pole post are connected, it has electrolyte to fill in the battery case. This patent discloses a connector as the flow restricting connector. However, the sectional area of the pole is much larger than that of the pole disclosed in the patent after the capacity of the battery is really improved, and the problems that the pole dissipates heat, the electrolyte swells, the stress of the battery core is uneven and the like are also encountered.

Disclosure of Invention

In order to solve the above problems of the high-capacity single battery, the present application provides a high-capacity lithium ion single battery and an assembling method, and the technical scheme adopted by the present application is as follows:

the utility model provides a large capacity battery cell, includes electric core group, electric core box, current collection post and heat controlling means, its characterized in that: the battery core group of this battery is lamination formula or coiling formula, the positive pole and the negative pole of battery core group are located two relative faces of battery core group respectively, the current collection post sets up in electric core box outside to be connected through the positive negative pole of connecting piece and electric core, the current collection post does not contact with the electrolyte of battery.

Furthermore, be equipped with the partial volume package in the electric core box, be equipped with the weak part of being convenient for pull open on the partial volume package.

Furthermore, the weak part is provided with a drawable filament, the filament is arranged on the capacity grading bag, and after the capacity grading bag is arranged in the electric core box body, two thin edge side surfaces of the capacity grading bag can be torn by lifting the filament, so that the large-capacity battery forms a sharing system of the electrolyte.

Furthermore, before the capacity grading packages are arranged in the battery cell box body, the capacity grading packages are subjected to liquid injection, sealing and formation processes in advance, the battery core groups formed by a plurality of capacity grading packages are subjected to capacity grading and grouping according to parameters such as internal resistance, capacity and voltage, and the capacity grading packages with the parameters close to each other are arranged in the same battery cell box body in parallel.

Furthermore, the battery cell box body is composed of an upper cover plate, a lower cover plate, a positive cover plate, a negative cover plate, a front side cover plate and a rear side cover plate, a plurality of first connecting pieces are arranged on one sides, close to the battery cells, of the positive cover plate and the negative cover plate, and a plurality of second connecting pieces are arranged on one sides, far away from the battery cells, of the positive cover plate and the negative cover plate.

In the prior art, the interior of a battery core, a current collecting column and the like are welded well, and then the battery core is placed into a battery shell with an upper cover only and then the upper cover is welded. The mode is only suitable for small-capacity batteries, because the size of the current collecting column of a large-capacity battery is large, the diameter of the current collecting column can reach 10cm, the current collecting column is placed in a battery shell, the filled electrolyte also submerges a pole column, the filling amount of the electrolyte is easily increased, and the safety is affected due to the large amount of the electrolyte; the utmost point post calorific capacity is big, and sealed problem also is not good to be solved, and the heat pipe will buckle 90 degrees refabrication coldness after stretching out on utmost point post, can influence refrigeration efficiency greatly.

Furthermore, the first connecting piece and the second connecting piece penetrate through the positive electrode cover plate and the negative electrode cover plate and are in insulation sealing with the positive electrode cover plate and the negative electrode cover plate through an insulation sealing material, and the second connecting piece is made of aluminum.

Further, the insulating sealing material is a ceramic material and/or a polymer material.

Furthermore, the first connecting piece at the inner side and the second connecting piece at the outer side of the positive and negative electrode cover plates are respectively connected with the middle connecting pieces on the upper and lower cover plates, and the middle connecting pieces are sealed with the positive and negative electrode cover plates by insulation treatment.

Further, the intermediate connecting piece on the negative cover plate is a copper-aluminum composite plate, wherein the copper surface of the copper-aluminum composite plate is connected with the inner side second connecting piece, and the outer side of the copper-aluminum composite plate is connected with the outer side second connecting piece.

Further, the first connecting piece on the inner side is made of copper, and the second connecting piece on the outer side is made of aluminum.

The copper-aluminum composite board is used for welding transition, the copper-aluminum composite board and the negative pole cover plate are designed as a whole, the copper material is welded in the second connecting piece, and the aluminum material is welded outside the second connecting piece. So as to achieve the purpose of placing the current collecting column outside the battery shell.

Furthermore, the positive current collecting piece and the negative current collecting piece at two ends of the capacity grading pack can be respectively provided with a positive connecting piece and a negative connecting piece, and the positive connecting piece and the negative connecting piece are respectively welded with the first connecting pieces on the positive cover plate and the negative cover plate; the positive connecting piece is made of aluminum, and the negative connecting piece is made of copper or nickel.

Further, an inner insulation diaphragm is arranged between the first connecting pieces on the inner sides of the positive and negative electrode cover plates and the positive and negative electrode connecting pieces on the current collecting sheet. In order to prevent the inside positive and negative electrodes from contacting with the shell of the battery core, actually, the inside of the existing battery is provided with a diaphragm, and the battery is connected through the positive and negative cover plates, so that an extra layer of diaphragm is needed.

Further, the partial volume package is flexible soft package casing, the material of casing is plastic-aluminum complex film or plastic film.

Furthermore, the filaments are embedded into two sides of the thin edge of the shell before two ends of the capacity grading bag are sealed, and two ends of the filaments and the positive and negative connecting sheets of the electric core group extend out of two ends of the capacity grading bag together.

Further, pull rings are arranged at two ends of the filament, the filament is torn by the pull rings before the front cover plate and the rear cover plate are assembled, so that two sides of the volume-dividing bag are torn, and the filament is removed. Two sides of the partial volume package are all opened through the thin wires, which is equal to tearing the shell of the partial volume package into two diaphragms, so that the battery cell is not blocked completely, and an absolute shared electrolyte system of a large-capacity battery is realized.

Furthermore, the filament is an insulating high-strength fiber material or a high-strength metal wire wrapped by a polymer insulating layer.

Furthermore, the upper cover plate or the upper parts of the positive and negative cover plates of the battery cell box body are provided with an explosion venting port and a liquid injection port.

Further, a liquid outlet is arranged on the lower cover plate of the battery cell box body or the lower parts of the positive and negative cover plates.

Furthermore, a protruding part is arranged on the explosion venting port.

Furthermore, a pressure relief film is arranged on the explosion relief opening, and a weak point can be arranged on the pressure relief film.

Further, the liquid injection port and the liquid discharge port may be opened or closed twice. So as to realize secondary liquid change and prolong the service life of the battery.

Furthermore, the joints of the front side cover plate and the rear side cover plate and the adjacent cover plates are provided with heat insulation sealing rings; and the gaps between the front side cover plate and the adjacent cover plate and the gaps between the rear side cover plate and the adjacent cover plates are sealed by laser welding.

Furthermore, a plurality of through grooves are formed in the side face of the flow collecting column, and the thickness of the through groove part is smaller than that of the flow collecting column.

Further, a second connecting piece on the outer sides of the positive and negative electrode cover plates penetrates through the through groove and is folded at a right angle on the penetrating surface of the through groove; and the second connecting sheet and the flow collecting column are welded through the through groove surface.

Furthermore, an insulating diaphragm is arranged between the current collecting column and the positive and negative electrode cover plates. In order to prevent the short circuit between the current collecting column and the positive and negative electrode cover plates, a diaphragm is required to be arranged.

Further, the current collecting columns are linear and are not bent. Because the current collecting column is not bent, the heat pipe arranged on the current collecting column does not need to be bent, and the heat conduction efficiency can be greatly improved.

Furthermore, a groove is arranged on the flow collecting column, and a soaking pipe is embedded in the groove. The soaking pipe is a copper heat pipe and/or an aluminum heat radiator. Further, a heating pipe can be arranged in the groove, and the heating pipe is an electric heating pipe.

Furthermore, a plurality of wiring holes are formed in the flow collecting column.

Further preferably, the upper part of the current collecting column is provided with at least 2, preferably 3, main wiring holes.

Further preferably, the current collecting column is provided with at least 2 shunt wiring holes, and the distances between the shunt wiring holes are equal. Further preferably, the number of the shunt wiring holes is 6.

Further, the battery cell box body is provided with an operation protection device, and the operation protection device is arranged at the battery liquid injection port.

Furthermore, the operation protection device is a hollow cavity structure and is divided into an upper cavity and a lower cavity, wherein the lower cavity is communicated with the interior of the battery cell box body, and the upper cavity is isolated from the lower cavity through a sealing piston.

Further, the upper chamber is in a vacuum state, and a spring is further arranged in the upper chamber to ensure that the sealing piston is in a relatively fixed state and can reciprocate along the axial direction of the operation protection device. For a large-battery single battery, the electrolyte is injected in a large amount, the battery normally heats in the using process, the electrolyte is likely to bulge, and the operation protection device can effectively solve the problem.

Furthermore, at least one heat control device is arranged on the vertical surface of the flow collecting column in a clinging manner. Further, the heat control device is a semiconductor refrigeration sheet or a water cooling plate.

Further, an insulating protective cover can be arranged outside the current collecting column; and an insulating diaphragm is arranged outside the battery cell box body.

Another object of the present invention is to provide a method for assembling a large capacity unit cell, including the steps of:

s100: manufacturing an electric core group: stacking the laminated battery cores to a certain thickness or winding the wound battery cores to a certain diameter and pressing to a certain thickness, and welding the positive and negative connecting pieces and the positive and negative current collectors of the battery core group into a whole;

s200: making a grading bag: filling the cell group into a capacity grading bag, simultaneously filling 2 filaments into the capacity grading bag together, injecting electrolyte, packaging, grading, and filling a plurality of capacity grading bags with similar parameter values into the same cell box body according to voltage, internal resistance and capacity parameters to form a cell of the high-capacity single battery;

s300: welding the first connecting pieces on the inner sides of the positive and negative electrode cover plates: sequentially welding the positive and negative connecting pieces of the capacity grading bag with the first connecting pieces on the inner sides of the positive and negative cover plates from bottom to top;

s400: welding an upper cover plate and a lower cover plate: respectively welding the upper cover plate and the lower cover plate with the positive cover plate and the negative cover plate;

s500: welding the front side cover plate and the rear side cover plate: sequentially tearing a filament pull ring of the volume-dividing bag, removing the filament to open two side faces of the volume-dividing bag, covering a front side cover plate and a rear side cover plate, and welding gaps between the front side cover plate and the rear side cover plate and between the front side cover plate and the adjacent cover plate to finish the manufacture of the battery cell box body;

s600: welding a converging column: a plurality of second connecting pieces on the outer side of the positive electrode cover plate penetrate through the through groove parts of the positive electrode collector columns one by one, the second connecting pieces are folded at right angles to be attached to the upper surfaces of the through grooves, and then the positive electrode collector columns are welded; welding the negative current collecting column in the same way;

s700: assembling a heat control device and a heat pipe;

s800: assembling a shell protective cover, and pasting an insulating protective film outside the battery cell box body;

s900: secondary liquid injection;

s1000: and installing an operation protection device.

Further, in step S200, when the capacity grading packages are loaded into the battery cell box, a stress support may be disposed between the capacity grading packages, so as to balance stress of the capacity grading packages.

Further, in step S300, after the second connecting members of the positive and negative electrode cover plates are welded to the positive and negative connecting members, the positive and negative electrode cover plates are pressed toward the battery cell to bend the welded portion, so that the space of the battery cell box is compact.

Further, in step S400, before welding the upper cover plate and the lower cover plate, heat insulating gaskets may be placed at the corners of the partial volume bag.

Further, in step S400, before welding the upper and lower cover plates, necessary components on the explosion relief port are assembled in advance, and the liquid injection port and the liquid discharge port are sealed.

Further, in step S500, before the filament is pulled open, dust removal and drying processes need to be performed on the inner side of the battery cell box body and the volume-dividing bag.

Further, in step S500, a groove may be formed in the casing portion of the battery cell box, and a heat insulation sealing ring may be placed in the groove.

Further, in step S600, before welding the current collecting column, the second connecting member outside the cover body may be folded at a right angle, and then the second connecting member and the cut surface of the through groove may be pre-attached tightly by a mechanical method such as a press bolt or a press strip.

Further, in step S700, when the heat control device is assembled with the current collecting column, it is necessary to coat an insulating heat conducting glue or dispose an insulating heat conducting gasket on a joint surface between the current collecting column and the heat control device.

Further, in step S700, when the heat pipe is assembled with the current collecting post, a bonding surface between the assembly groove on the current collecting post and the heat pipe needs to be coated with a heat conductive adhesive.

Compared with the prior art, the beneficial effects of this application lie in:

1. the capacity grading bags are filled with liquid in advance and subjected to capacity grading, and the capacity grading bags with similar performance are placed into the same battery box body to form a shared electrolyte system, so that the performance consistency of each electric core group in the large-capacity battery is ensured, and the performance of the large-capacity battery is improved.

2. The capacity grading bag is embedded with filaments in advance, and the filaments are easy to remove, so that a high-capacity battery does not need a strict environment in the processes of welding, transporting and processing in the early period, and the safety, the production efficiency and the yield are improved.

3. The liquid injection port and the liquid discharge port are arranged, and when the large-capacity battery runs for a period of time, the electrolyte in the battery can be updated through the liquid injection port and the liquid discharge port, so that the service life of the large-capacity battery is prolonged.

4. And the current collecting column is arranged outside the battery cell box body and does not contact the electrolyte in the battery cell box body. And a soaking heat pipe and a heat control device are arranged on the current collecting column, so that the main heating part of the high-capacity single battery, namely the current collecting column, is isolated from the battery core and the electrolyte. On one hand, the modes of the heat semiconductor refrigerating sheet and the like on the current collecting column are easy to control, on the other hand, unsafe factors such as decomposition of electrolyte and the like caused when the current collecting column is overheated are avoided, and the stability and the safety of the large-capacity battery are also improved.

5. The operation protection device is arranged, the structure safety of the battery cell box body can be effectively protected by the operation protection device, the bad results possibly caused by expansion and contraction and the like due to normal expansion and contraction of electrolyte when the high-capacity battery operates normally are prevented, and the normal use of the high-capacity battery is ensured.

6. Be equipped with a plurality of wiring mouths on the mass flow body, a plurality of large capacity battery cells use simultaneously after connecting, can set up two or the reposition of redundant personnel wiring hole on two on the mass flow body, can make the current geometric proportion that the mass flow post bore reduce, and then make large capacity battery cell's calorific capacity reduce.

Additional advantages, objects, and features of the application 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 application.

Drawings

In order to more clearly illustrate the embodiments of the present application 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 following description are only some embodiments of the present application, 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 laminated electric core assembly according to an embodiment of the present application.

Fig. 2 is a schematic structural view of a wound electric core assembly according to an embodiment of the present application.

Fig. 3 is a schematic diagram of a structure of a capacity allocation packet according to an embodiment of the present application.

Fig. 4 is a schematic structural diagram of an upper cover plate according to an embodiment of the present application.

Fig. 5 is a schematic structural diagram of a lower cover plate according to an embodiment of the present application.

Fig. 6 is a schematic diagram of the structure of the positive and negative electrode cover plates according to the embodiment of the present application.

Fig. 7 is an exploded view of a cell box structure according to an embodiment of the present application.

Fig. 8 is a schematic view of a welding structure of the capacity grading bag according to the embodiment of the present application.

Fig. 9 is a schematic structural view of the separated-content package according to the embodiment of the present application after being torn.

Fig. 10 is a schematic structural diagram of the battery cell box body after welding is completed according to the embodiment of the application.

Fig. 11 is a schematic view of a current collecting column structure according to an embodiment of the present application.

Fig. 12 is a schematic view of the current collecting post of the present application cooperating with the second connecting member outside the positive and negative cover plates.

Fig. 13 is a structural schematic diagram of a welding completion structure of the current collecting post and the cell box according to the embodiment of the present application.

Fig. 14 is a schematic view of the overall structure of a large-capacity single battery according to the embodiment of the present application.

Fig. 15 is a schematic diagram of a large-capacity single negative electrode cover plate structure according to an embodiment of the present application.

Fig. 16 is an exploded view of a large-capacity single negative electrode cover plate structure according to an embodiment of the present application.

Fig. 17 is a schematic cross-sectional view of a large-capacity monolithic negative electrode cap plate according to an embodiment of the present application.

Fig. 18 is a schematic view of the installation position of the operation protection device according to the embodiment of the present application.

Fig. 19 is a sectional view showing the structure of the operation protection device according to the embodiment of the present application.

Fig. 20 is a schematic structural diagram of a large-capacity single battery according to an embodiment of the present application.

Fig. 21 is a schematic structural view of connection of a plurality of single cells according to the embodiment of the present application.

Drawings

1-positive current collecting column; 2-electric core box body; 3-a negative collector column; 4-a protective cover; 5-heat control device.

33-laminated core pack; 31-positive electrode connection; 32-negative electrode connector.

36-a coiled electric core group; 34-positive electrode connection member; 35-negative electrode connector.

51-capacity grading package; 52-sealing edges of the partial volume bags; 53. 55, 58- -filament; 54-positive connection; 59-negative electrode connector; 56-split surface of the partial volume bag; 57-filament tab.

61-upper cover plate; 62-explosion venting; 63-the explosion venting port protrudes out of the connector; 64-liquid injection port; 65-heat insulation seal ring groove; 66-lower cover plate; 67-insulating seal ring groove.

614-positive and negative cover plates; 610-heat insulation seal ring groove; 611. 613-second connecting piece outside the cover plate; 612-a seal; 615-a first connection inside the cover plate; 616-negative cover plate; 617-groove sealing ring; 618-copper aluminum composite board; 619-welding a sealing plate; 620-cover plate inside first connector; 621. 622-second connector outside the cover plate; 623-copper-aluminum composite board copper surface; 624-aluminum copper composite board aluminum surface.

71-front side cover plate; 72-front heat-insulating sealing ring; 73-positive cover plate; 74-upper cover plate; 75-rear heat-insulating seal ring; 76-rear side cover plate; 77-a seal; 78. 79-an outboard second connector; 710-negative electrode cover plate; 711-liquid drain; 715-lower cover plate.

81-positive and negative internal insulation diaphragm; 82-positive and negative electrode welding surfaces.

91-a current collecting column; 92-collector post solder joint; 93. 94-through slots; 95-external wiring ports; 96-collecting column soaking pipe groove.

10-a safe operation device; 101-an upper chamber; 102-a sealing piston; 103-a lower chamber; 104-connecting head.

211-1 ^# A high-capacity battery anode current collecting column; 221-2 ^# A high-capacity battery anode current collecting column;

231-3 ^# a high-capacity battery anode current collecting column; 212-1 ^# A high-capacity battery negative collector column;

222-2 ^# a high-capacity battery negative collector column; 232-3 ^# A high-capacity battery negative collector column;

2120-1 ^# a large-capacity battery negative electrode general wiring hole; 2220-2 ^# A large-capacity battery negative electrode general wiring hole;

2320-3 ^# a large-capacity battery negative electrode general wiring hole;

2121-1 ^# a high-capacity battery cathode shunting wiring hole 1; 2122-1 ^# A high-capacity battery cathode shunting wiring hole 2; 2123-1 ^# A high-capacity battery cathode shunting wiring hole 3; 2124-1 ^# A high-capacity battery cathode shunt wiring hole 4; 2125-1 ^# A high-capacity battery cathode shunt wiring hole 5; 2126-1 ^# A high-capacity battery cathode shunt wiring hole 6;

2221-2 ^# a high-capacity battery cathode shunting wiring hole 1; 2222-2 ^# A high-capacity battery cathode shunting wiring hole 2; 2223-2 ^# A high-capacity battery cathode shunting wiring hole 3; 2224-2 ^# A high-capacity battery cathode shunt wiring hole 4; 2225-2 ^# A high-capacity battery cathode shunt wiring hole 5; 2226-2 ^# A high-capacity battery cathode shunt wiring hole 6;

2321-3 ^# a high-capacity battery cathode shunting wiring hole 1; 2322-3 ^# A high-capacity battery cathode shunting wiring hole 2; 2323-3 ^# High-capacity battery cathode shunting wiring hole3；2324-3 ^# A high-capacity battery cathode shunt wiring hole 4; 2325-3 ^# A high-capacity battery cathode shunt wiring hole 5; 2326-3 ^# A high-capacity battery cathode shunt wiring hole 6;

Detailed Description

The present application will now be described in further detail with reference to the accompanying drawings, whereby one skilled in the art can, with reference to the description, make an implementation.

It will be understood that terms such as "having," "including," and "comprising," as used herein, do not preclude the presence or addition of one or more other elements or groups thereof.

It should be understood that directional terms such as "upper" and "lower" are used herein in accordance with the accompanying drawings to facilitate better understanding of the technical aspects of the present application.

The technical solution of the present application will be described in detail below with reference to the accompanying drawings and specific embodiments.

As shown in fig. 1 to 14, the present application discloses a high-capacity single battery, which comprises a core pack 33, a capacity-dividing pack 51, a cell box 2, a current-collecting column 91, a heat control device 5, a safety operation device 10, an external protection cover 4, and the like.

In this embodiment, a structure of the laminated core pack 33 is provided, wherein the positive electrode and the negative electrode of the laminated core pack are located on two opposite side surfaces of the battery cell, and the positive electrode and the negative electrode are welded with the positive electrode connecting piece 31 and the negative electrode connecting piece 32;

in this application embodiment, anodal connecting piece material is the aluminium material, and the material of negative pole connecting piece is the nickel material, and its length that stretches out the partial volume package is 12mm, the width is 60mm, thickness is equal 0.5 mm.

Meanwhile, in the embodiment, a structure of the winding type electric core group 36 is provided, the positive electrode and the negative electrode of the winding type electric core group are located on two side surfaces of two winding ends, the winding type electric core is flattened, and the positive electrode connecting piece 34 and the negative electrode connecting piece 35 are welded on the positive electrode and the negative electrode;

above the electric core group pack into in advance and divide the appearance package 51, divide the appearance package structure to be sealed all around, the flexible soft package of both ends open-ended, divide the appearance to wrap the material and can be for plastic-aluminum material or plastics material, it is the plastics material that can select to have for the plastics material when dividing the appearance package: polyethylene films, polypropylene films, polyvinyl chloride films, polyurethane films, polyacrylate films, polyethylene terephthalate films, and the like.

The group of the electric core groups and 1 filament 55 are placed into a flexible soft package with openings at two ends, the filament is made of high-strength flexible glass fiber, the diameter of the fiber is 0.3mm, and pull rings 57 are arranged at two ends of the filament.

Furthermore, one end of the flexible soft bag is sealed by a plastic packaging machine together with the positive electrode connecting piece 59 or the negative electrode connecting piece 54 and the flexible glass fiber filaments 55 in advance, and the other sealed end 52 is filled with electrolyte and then sealed by a vacuum plastic packaging machine after internal air is pumped out by the vacuum plastic packaging machine.

In some embodiments, the filament is formed by plastic-sealing an insulating layer with the thickness of less than 0.1mm outside a steel wire with the diameter of 0.2mm, and the two ends of the filament are provided with pull rings.

Further, the capacity grading packets of the batteries are formed and graded in advance, the capacity grading packets with approximate internal resistance values are arranged in the same battery cell box body according to groups according to different internal resistances, and the internal resistance difference of the capacity grading packets arranged in the same battery cell box body is within 5%;

in some embodiments, the capacity grading packets put into the same cell box body are classified according to different capacity standards, and the capacity difference of the capacity grading packets in the same cell box body is within 1%.

Further, the inner side second connecting piece 615 between the positive electrode connecting piece 54 and the positive electrode cover plate 614 and the inner side second connecting piece between the negative electrode connecting piece 59 and the negative electrode cover plate of the partial volume package are welded successively from bottom to top by ultrasonic welding, all partial volume packages of the large-capacity single batteries are welded to the inner side first connecting pieces of the positive electrode cover plate and the negative electrode cover plate, then the positive electrode cover plate and the negative electrode cover plate on the two sides are pressed inwards, and the welding pieces are bent by pressing, so that the structure of the battery cell box body is compact. And the upper cover plate 74 and the lower cover plate 712 are welded with the positive and negative electrode cover plates as a whole by laser welding.

The inner second connecting piece 615 and the outer second connecting pieces 613 and 611 on the positive and negative electrode cover plates 614 of the embodiment of the application are arranged separately and welded with the aluminum intermediate layer sealed in the ceramic insulating layers on the positive and negative electrode cover plates into an integral structure, and the inner second connecting piece of the positive electrode cover plate is an aluminum connecting piece with the thickness of 0.5mm, the width of 60mm and the length of 10mm and is welded with the aluminum positive electrode connecting piece of the volume-divided bag; the second connecting piece on the inner side of the negative electrode cover plate is a copper connecting piece with the thickness of 0.5mm, the width of 60mm and the length of 10mm, and is welded with the nickel positive electrode connecting piece of the capacity grading bag;

further, before the anode and cathode connectors are welded to the first connectors on the inner sides of the anode and cathode cover plates, the inner insulating diaphragm 81 is placed between the second connectors of the anode and cathode cover plates and the anode and cathode cover plates.

In some embodiments, an insulating diaphragm is also placed between the positive and negative connectors and the capacity grading bag to ensure that the battery cell is not short-circuited with the battery cell box body.

In some embodiments, before the positive and negative electrode cover plates are pressed inwards, L-shaped heat-insulating pads are placed on all corners of the partial volume bag.

Further, after the positive and negative electrode lid plates are welded to the upper lid plate 74 and the lower lid plate 712, respectively, the front lid plate 71 and the rear lid plate 76 are welded to the welded lid plates, and the front lid plate heat insulating gasket and the rear heat insulating gasket are placed in the grooves of the square heat insulating gaskets formed by the positive and negative electrode lid plates and the upper and lower lid plates before welding.

Further, before the front cover plate 71 and the rear cover plate are welded to the cover plate, all the filaments 53 and 55 of the partial volume bag are torn off, and the front cover plate and the rear cover plate are mechanically assembled with the cover plate in advance before welding, so as to prevent the electrolyte from leaking, as shown in fig. 9.

In this application embodiment, be provided with on the upper cover plate of large capacity battery and let out and explode mouth 62, let out and explode the mouth on the welding have let out the rupture membrane and let out the connecting piece 63 that explodes the mouth protrudingly, foretell connect piece that explodes that is provided with the external screw thread and can merge a processing system with the letting out of a plurality of large capacity battery cells through systemic pipeline, when this large capacity battery takes place thermal runaway, let out and explode a spun gas and get into processing system through the pipeline and handle to can avoid secondary damage's emergence.

The upper cover plate is also provided with a liquid injection port for secondary injection of large-capacity batteries, and the liquid injection port has the functions of vacuumizing, exhausting and the like.

In the embodiment of the application, the liquid outlet 711 is arranged at the lower part of the negative cover plate, so that the electrolyte in the large-capacity battery can be updated after the large-capacity battery is used for a period of time or under the matching of the liquid inlet at the liquid outlet, and the service life of the large-capacity battery is prolonged.

The thickness of just, negative pole mass flow post 91 that this application embodiment relates to is 40mm, and the width is 60mm, all is provided with logical groove face of weld 92 in two sides of mass flow post, and the thickness that leads to the groove face of weld is 8mm less than the thickness of mass flow post, is provided with a plurality of logical grooves 93, 94 on leading to the groove face of weld, and the length that leads to the groove is 10mm, and the width is 2mm, and the clearance is 12 mm.

In the embodiment of the application, two outer second connecting pieces 78 and 79 are arranged on the outer sides of the positive and negative electrode cover plates, the width of each second connecting piece is 10mm, the length of each second connecting piece is 12mm, the thickness of each second connecting piece is 1mm, the distance between the outer second connecting pieces of each group is 12mm,

the outer second connecting members of the positive and negative electrode cover plates may pass through the through grooves 79 on the through groove welding surface 92 of the current collecting post, as shown in fig. 12, and be folded vertically to make the second connecting members and the through groove welding surface closely coincide, and then be welded together by laser welding, as shown in fig. 13.

In some embodiments, before the second connecting members outside the positive and negative cover plates are welded to the assembling and current collecting column, an insulating gasket is placed between the current collecting column and the positive and negative cover plates to prevent a short circuit between the current collecting column and the cell box.

Furthermore, one or more grooves are arranged on the flow collecting column, and soaking pipes or heating pipes can be embedded in the grooves.

Further, the soaking pipe can be a copper heat pipe or an aluminum heat radiator.

Further, the heating pipe may be an electric heating pipe.

Furthermore, this application has set up an operation protection device to large capacity battery, and the operation protection device mountable is on annotating the liquid mouth, annotates the liquid completion back when the battery secondary, assembles operation protection device to annotating on the liquid mouth again, and operation protection device divide into cavity and lower cavity, goes up cavity and lower cavity and directly is sealed the isolation by the piston, in order to guarantee sealed, can set up the sealing washer on piston and the section of upper and lower cavity.

The embodiment of the application is to go up the cavity evacuation and handle to the spring is placed to the cavity, and the one end and the piston of spring are fixed, and the other end is fixed with the top of last cavity. Under normal state, the piston contacts with the bottom end of the lower chamber, at this time, the volume of the upper chamber is in the maximum state, and the spring is in a free telescopic state.

When the large capacity battery operation, the inside temperature of electric core box can rise, and at this moment the inside electrolyte of electric core box can thermal expansion, and electrolyte meets and leads to electric core internal pressure to increase, and at this moment the piston that electrolyte can compress the safe operation device leads to going up the cavity space and reduces, and cavity space increases down, and cavity can hold electrolyte because the volume increase that expend with heat and contract with cold and lead to down, and piston pressure is received to this moment the spring. When the electrolyte expands to a maximum volume, the spring receives the greatest pressure and the space in the upper chamber is compressed to a minimum, at which point the spring receives less pressure than the pressure at which the vent opens.

When the battery does not operate or is placed, the temperature of the electrolyte inside the battery cell box body is reduced, the volume of the electrolyte is contracted, the spring can push the piston to press the electrolyte into the battery cell box body under the action of pressure, and the operation protection device can effectively protect the structural safety of the battery cell box body, so that the problem that the expansion and contraction caused by the normal expansion and contraction of the electrolyte possibly cause bad results when the large-capacity battery operates normally is prevented, and the normal use of the large-capacity battery is ensured.

Furthermore, one or more heat control devices are arranged on the flow collecting column, and the heat control devices can be semiconductor refrigeration sheets or water cooling plates.

In the embodiment of the present application, the heat control device is set as a semiconductor cooling device, and four semiconductor cooling devices are provided on the outer side surfaces of the two collector posts, respectively.

Further, an insulating protective cover is arranged outside the current collecting column.

Furthermore, an insulating diaphragm is arranged outside the battery cell box body.

The embodiment of the application also discloses a structure of the negative electrode cover plate 616, which comprises the negative electrode cover plate 616, a groove-shaped sealing ring 617, a copper-aluminum composite plate 618 and a sealing plate 619. The groove-shaped sealing ring is clamped around the copper-aluminum composite plate to play the roles of insulation and sealing, the copper-aluminum composite plate clamped with the groove-shaped sealing ring is placed into the step of the negative electrode cover plate as shown in figure 16, the sealing cover plate is covered on the copper-aluminum composite plate, and the sealing cover plate and the negative electrode cover plate are welded into an integral structure.

In the embodiment of the application, the first connecting piece on the inner side of the cover plate can be welded with the copper surface of the copper-aluminum composite plate together before the copper-aluminum composite plate and the negative cover plate are welded into a whole, and the first connecting piece on the inner side of the cover plate is made of copper. And welding a second connecting piece outside the cover plate and the aluminum surface of the copper-aluminum composite plate together, wherein the second connecting piece outside the cover plate is made of aluminum.

Although the present embodiment discloses a structure of the negative electrode cover plate, if the copper-aluminum composite plate in the present embodiment is replaced by an aluminum plate, when the copper-aluminum composite plate is replaced by the aluminum plate, and the first connecting member inside the cover plate is replaced by an aluminum connecting member, the other structure is not changed, and the plate with such a structure can be used as the positive electrode cover plate.

As part of the present application, this embodiment discloses an external connection method for large-capacity single battery, as shown in fig. 20, when 1 ^# When large capacity battery exclusive use, there are two to external wiring mode:

one connection mode is that three bus connection holes on the upper part of the positive current collecting post 211 are connected in parallel and are connected with the external positive wire at the same time, and three bus connection holes 2120 on the upper part of the negative current collecting post 212 are connected in parallel and are connected with the external negative wire at the same time;

another connection method is that the 6 shunting connection holes 2121, 2122, 2123, 2124, 2125, and 2126 at the lower part of the negative current collecting post 212 are preferably equidistant holes, two or more shunting connection holes thereof are simultaneously connected with the external negative wire, the 6 shunting connection holes at the lower part of the positive current collecting post 211 are also equidistant holes, two or more shunting connection holes thereof are simultaneously connected with the external positive wire, so that the connection method can make the current borne by the positive current collecting post and the negative current collecting post smaller than the first one, and the heat productivity of the battery is reduced.

In practice, the number of the wiring holes on the current collecting column is not necessarily 6, and may be two or more.

Also when large capacity batteries are used in groups, as in fig. 21, a case is provided in which three groups of large capacity unit batteries are used simultaneously, 1 in fig. 21 ^# High-capacity single battery, 2 ^# High-capacity single battery, 3 ^# When large capacity battery cell uses in groups, the mode of connection has two kinds:

a connection mode is 1 ^# Three bus connection holes 2120, 2 at the upper part of the high-capacity battery negative current collecting column 212 ^# Three general wiring holes 2220, 3 on the upper part of the high-capacity battery negative current collecting column 15 ^# Three general wiring holes 2320 and 1 at the upper part of the large-capacity battery negative current collecting column 16 ^# Three main wiring holes 2 on the upper part of the positive current collecting column 211 of the large-capacity battery ^# Three general wiring holes 3 on the upper part of the positive current collecting column 221 of the large-capacity battery ^# The three main wiring holes on the upper part of the high-capacity battery anode current collecting column 231 are connected with the anode and cathode connecting wires respectively after being connected in parallel or in series.

Another connection mode is 1 ^# Two of the 6 shunt connection holes 2121, 2122, 2123, 2124, 2125 and 2126 at the lower part of the large-capacity battery negative current collecting column 212 are simultaneously and respectively connected with 2 ^# Two of the 6 shunting and wiring holes 2221, 2222, 2223, 2224, 2225 and 2226 at the lower part of the high-capacity battery negative current collecting column 222 are connected in parallel and then connected with 3 ^# 6 shunts at the lower part of the high-capacity battery negative current collecting column 232Two of the wiring holes 2321, 2322, 2323, 2324, 2325 and 2326 are connected in parallel, and then are uniformly and externally connected to form a negative electrode connecting wire of the large-capacity battery pack, and the positive electrodes are connected in the same way, so that the large-capacity single battery packs form a parallel structure through the shunting wiring holes; when the large-capacity unit battery packs are connected in series, the connection method is as shown in fig. 21: 1 ^# Two of the 6 shunt connection holes 2121, 2122, 2123, 2124, 2125 and 2126 at the lower part of the large-capacity battery negative current collecting column 212 are simultaneously and respectively connected with 2 ^# Two of the 6 shunting wiring holes at the lower part of the large-capacity battery anode current collecting column 221 are connected, and 2 times ^# Two of the 6 shunting and wiring holes 2221, 2222, 2223, 2224, 2225 and 2226 at the lower part of the high-capacity battery negative pole current collecting column 222 are simultaneously and respectively connected with 3 ^# Two of the 6 shunt wiring holes at the lower part of the positive current collecting column 231 of the large-capacity battery are connected, and 1 ^# Two of the 6 wiring holes at the lower part of the positive current collecting column 211 of the large-capacity battery are connected in parallel and are used as the positive external connecting wire of the large-capacity battery pack, 3 ^# Two of the 6 shunting connection holes 2321, 2322, 2323, 2324, 2325 and 2326 at the lower part of the large-capacity battery negative pole current collecting column 232 are connected in parallel outwards and are used as a negative pole external connection wire of the large-capacity battery pack. In this embodiment, the plurality of shunting wiring holes at the lower part of the current collecting column are preferably arranged at equal intervals, and this embodiment only describes that two of the 6 wiring holes are simultaneously connected, and actually, the number of the wiring holes may not be necessarily 6, but also the number of the interconnection ports is not necessarily two, and under the condition that the intention of the patent main body is not violated, the number of the wiring holes and the interconnection lines may be a plurality, so that the connection method can also make the current borne by the current collecting column smaller than that of the first type, and the heat productivity of the large-capacity single battery is reduced.

Although the embodiments of the present application have been disclosed above, they are not limited to the applications listed in the description and the embodiments. It can be applied in all kinds of fields suitable for the present application. Additional modifications will readily occur to those skilled in the art. Therefore, the application is not limited to the specific details and illustrations shown and described herein, without departing from the general concept defined by the claims and their equivalents.

Claims (38)

1. The utility model provides a large capacity battery cell, includes electric core group, electric core box, current collection post and heat controlling means, its characterized in that: the battery core group is of a laminated type or a winding type, the positive pole and the negative pole of the battery core group are respectively located on two opposite faces of the battery core group, the current collecting column is arranged outside the battery core box body and is connected with the positive pole and the negative pole of the battery core through a connecting piece, and the current collecting column is not in contact with electrolyte of the battery.

2. A large capacity battery cell as defined in claim 1, wherein: the battery cell box is internally provided with a capacity grading bag, and the capacity grading bag is provided with a weak part convenient to pull open.

3. A large capacity battery cell as defined in claim 2, wherein: the weak part is a thin wire which can be pulled open, the thin wire is arranged on the capacity grading bag, and after the capacity grading bag is arranged in the battery cell box body, two thin edge side surfaces of the capacity grading bag can be torn by pulling the thin wire, so that the large-capacity battery forms a sharing system of electrolyte.

4. A large capacity battery cell as defined in claim 2, wherein: before the capacity grading package is arranged in the battery cell box body, the capacity grading package is formed by carrying out the processes of pre-injecting liquid, sealing and forming on the capacity grading package, namely, the capacity grading package is formed by grading and grouping the battery cell groups consisting of a plurality of capacity grading packages, and the capacity grading packages are connected in parallel and are placed in the same battery cell box body.

5. A large capacity battery cell as defined in claim 1 or 2, wherein: the battery cell box body comprises an upper cover plate, a lower cover plate, a front side cover plate, a rear side cover plate, a positive cover plate and a negative cover plate, wherein a plurality of first connecting pieces are arranged on one sides of the positive cover plate and the negative cover plate, which are close to the battery cell, and a plurality of second connecting pieces are arranged on one sides of the positive cover plate and the negative cover plate, which are far away from the battery cell.

6. A large capacity battery cell as defined in claim 5, wherein: the first connecting piece and the second connecting piece penetrate through the anode cover plate and the cathode cover plate and are in insulation sealing with the anode cover plate and the cathode cover plate through insulation sealing materials, and the second connecting piece is made of aluminum.

7. A large capacity battery cell as defined in claim 5, wherein: the first connecting piece on the inner side of the positive electrode cover plate and the second connecting piece on the outer side of the negative electrode cover plate are respectively connected with the middle connecting pieces on the upper cover plate and the lower cover plate, and the middle connecting pieces are insulated and sealed with the positive electrode cover plate and the negative electrode cover plate.

8. A large capacity battery cell as defined in claim 7, wherein: the middle connecting piece on the negative pole cover plate is a copper-aluminum composite plate, wherein the copper surface of the copper-aluminum composite plate is connected with the inner side second connecting piece, and the outer side of the copper-aluminum composite plate is connected with the outer side second connecting piece.

9. A large capacity battery cell as defined in claim 7, wherein: the first connecting piece in inboard is the copper product, the second connecting piece in the outside is the aluminium material.

10. A large capacity battery cell as defined in claim 4, wherein: the positive collector plate and the negative collector plate at two ends of the capacity grading pack can be respectively provided with a positive connecting piece and a negative connecting piece, and the positive connecting piece and the negative connecting piece are respectively welded with the first connecting pieces on the positive cover plate and the negative cover plate; the positive connecting piece is made of aluminum, and the negative connecting piece is made of copper or nickel.

11. A large capacity battery cell as defined in claim 10, wherein: and an inner insulating diaphragm is arranged between the first connecting piece on the inner sides of the positive and negative electrode cover plates and the positive and negative connecting pieces on the current collecting sheet.

12. A large capacity battery cell as defined in claim 2, wherein: the partial volume package is flexible soft packet of casing, the material of casing is plastic-aluminum complex film or plastic film.

13. A large capacity battery cell as defined in claim 3, wherein: the filament is embedded into the two sides of the thin edge of the shell before the two ends of the capacity grading bag are sealed, and the two ends of the filament, the positive connecting sheet and the negative connecting sheet of the electric core group extend out of the two ends of the capacity grading bag together.

14. A large capacity battery cell as defined in claim 13, wherein: and the two ends of the filament are provided with pull rings, the filament is torn by the pull rings before the front cover plate and the rear cover plate are assembled, so that the two sides of the volume-dividing bag are torn, and the filament is removed.

15. A large capacity battery cell as defined in claim 3, wherein: the filament is an insulating high-strength fiber material or a high-strength metal wire wrapped by a high-molecular insulating layer.

16. A large capacity battery cell as defined in claim 5, wherein: and the upper part of the upper cover plate or the positive and negative cover plates of the battery cell box body is provided with an explosion venting port and a liquid injection port.

17. A large capacity battery cell as defined in claim 16, wherein: and a liquid discharge port is arranged on the lower cover plate of the battery cell box body or the lower parts of the positive and negative cover plates.

18. A large capacity battery cell as defined in claim 16, wherein: and a protruding part is arranged on the explosion venting port.

19. A large capacity battery cell as defined in claim 16, wherein: and a pressure relief film is arranged on the explosion relief port, and a weak point can be arranged on the pressure relief film.

20. A large capacity battery cell as defined in claim 16 or 17, wherein: the liquid injection port and the liquid discharge port can be opened or closed for the second time.

21. A large capacity battery cell as defined in claim 5, wherein: and the joints of the front side cover plate and the rear side cover plate and the adjacent cover plates are provided with heat insulation sealing rings.

22. A large capacity battery cell as defined in claim 21, wherein: and the gaps between the front side cover plate and the adjacent cover plate and the gaps between the rear side cover plate and the adjacent cover plates are sealed by laser welding.

23. A large capacity battery cell as defined in claim 1, wherein: the side of the flow collecting column is provided with a plurality of through grooves, and the thickness of the through groove part is smaller than that of the flow collecting column.

24. A large capacity battery cell as defined in claim 10, wherein: the outer sides of the positive and negative electrode cover plates are provided with second connecting pieces, and the second connecting pieces penetrate through grooves in the side faces of the current collecting columns and are folded at right angles on penetrating faces of the through grooves; and the second connecting piece and the flow collecting column are welded through a through groove surface.

25. A large capacity battery cell as claimed in claim 23, wherein: and an insulating diaphragm is arranged between the current collecting column and the positive and negative electrode cover plates.

26. A large capacity battery cell as defined in claim 1, wherein: the current collecting column is linear and is not bent.

27. A large capacity battery cell as claimed in claim 26, wherein: the collecting column is provided with a groove, and a soaking pipe is embedded in the groove.

28. A large capacity battery cell as claimed in claim 27, wherein: the soaking pipe is a copper heat pipe and/or an aluminum heat radiator.

29. A large capacity battery cell as claimed in claim 27, wherein: heating pipes can also be arranged in the grooves.

30. A large capacity battery cell as defined in claim 1, wherein: and a plurality of wiring holes are formed in the flow collecting column.

31. A large capacity battery cell as claimed in claim 30, wherein: and the upper part of the current collecting column is provided with at least 2 total wiring holes.

32. A large capacity battery cell as claimed in claim 30, wherein: at least 2 shunting wiring holes are formed in the current collecting column, and the distance between each shunting wiring hole is equal.

33. A large capacity battery cell as defined in claim 1, wherein: the battery cell box is provided with an operation protection device, and the operation protection device is arranged at a battery liquid injection port.

34. A large capacity battery cell as claimed in claim 33, wherein: the operation protection device is of a hollow cavity structure and is divided into an upper cavity and a lower cavity, wherein the lower cavity is communicated with the interior of the battery cell box body, and the upper cavity is isolated from the lower cavity through a sealing piston.

35. A large capacity battery cell as claimed in claim 34, wherein: the upper chamber is in a vacuum state, and a spring is further arranged in the upper chamber to ensure that the sealing piston is in a relatively fixed state and can reciprocate along the axial direction of the operation protection device.

36. A large capacity battery cell as defined in claim 1, wherein: at least one heat control device is arranged on the vertical surface of the flow collecting column in a clinging manner.

37. A large capacity battery cell as claimed in claim 36, wherein: the heat control device is a semiconductor refrigeration sheet or a water cooling plate.

38. A large capacity battery cell as defined in claim 1, wherein: an insulating protective cover can be arranged outside the current collecting column; and an insulating diaphragm is arranged outside the battery cell box body.

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