CN114696030A - Integral structure of large-capacity battery - Google Patents

Abstract

The invention discloses an overall structure of a large-capacity battery, belonging to the field of batteries, comprising at least one battery module. The battery module includes a casing, a cover, an electric core group, an electrode connector and a current collecting column, and the electric core group is located in the casing. , the two ends of the electrode connector are respectively connected with the pole ears of the battery core group and the current collecting column, and the current collecting column is arranged on both sides outside the casing. By arranging the current collecting column outside the battery casing, the heat can be dissipated in a timely and effective manner; meanwhile, the internal space of the battery is saved, and the energy density of the large-capacity battery is greatly improved. When a plurality of single cells are connected in series, an equal number of return-shaped card slots in opposite directions are arranged on the current collecting columns on both sides of the battery, so that a plurality of large-capacity batteries are connected in series with each other. On the one hand, the series connection method eliminates the need for large-capacity batteries to be connected by wires and saves materials; safety.

Description

The overall structure of a large-capacity battery

technical field

The invention relates to the field of batteries, in particular to an overall structure of a large-capacity battery.

Background technique

Large-capacity lithium battery is one of the development directions of lithium battery, which can be used in the field of energy storage and power battery. Compared with small-capacity batteries, large-capacity batteries eliminate the need to equip each battery or battery pack with a set of control devices. In fact, although the cost of single-cell batteries for large-capacity batteries increases, other supporting related equipment is greatly reduced. Generally speaking, its cost is reduced, which is conducive to competition in the market.

The application of large-capacity energy storage batteries in my country is currently in its infancy. The production of large-capacity single cells is restricted by many factors, including high requirements for production equipment, high requirements for product consistency, high product rejection rate, During the application process, the heat generation is concentrated and the heat release is large.

CN101931098A discloses a square battery, including a casing, a safety valve is arranged on the top of the casing, a pole piece and a pole lug are arranged in the casing, and the positive and negative poles of the pole piece are respectively connected with the positive and negative ends of the pole lug , the other end of the positive end of the pole ear and the other end of the negative end are respectively connected with a positive collecting column and a negative collecting column, the positive collecting column and the negative collecting column are set as a horizontal collecting column, and the positive collecting column and the negative collecting column are They are connected horizontally with the positive and negative ends of the tabs, respectively. However, the current collecting column of the patent does not directly extend out of the casing, the heat dissipation effect is not good, and the series connection of multiple batteries cannot be realized.

CN107658489A discloses a fuel cell module that is easy to install and disassemble, including a fluid distributor, front and rear baffles, a fuel cell soft pack, a battery soft pack connecting strip and a strap; the fuel cell soft pack includes a type I fuel cell soft pack After being integrated with the front baffle and the rear baffle respectively, they are fixed with strapping straps; and n pieces of fuel cell soft packs are stacked in sequence according to the interval between the type I fuel cell soft pack and the type II fuel cell soft pack. , connect them in series, and then install a fluid distributor in front of the front baffle; and bundle them together with strapping tapes to form a fuel cell module. However, in this patent, only the electrodes protrude from the casing, which cannot achieve good heat dissipation effect, and cannot save space in the battery, and the energy density is low; although the series connection is realized, the series connection structure is not stable enough and is not conducive to heat dissipation.

SUMMARY OF THE INVENTION

In order to solve the above problems, the present invention discloses an overall structure of a large-capacity battery, and the specific technical scheme is as follows:

The invention discloses an overall structure of a large-capacity battery, comprising at least one battery module, the battery module comprising a casing, a cover, a battery cell group, an electrode connector and a current collecting column, and the battery cell group is located in the In the casing, two ends of the electrode connector are respectively connected with the tabs of the battery core group and the current collecting column, and the current collecting column is arranged on both sides outside the casing.

Further limited, the cell group is composed of at least one cell, and the positive and negative ears of the cell group are located on the same side of the cell group and are connected to the electrode connector.

Further limited, a long side of the electrode connector is provided with a plurality of groups of through grooves, and the positive and negative electrodes of the cell group pass through the through grooves and are welded to the electrode connector after being bent vertically.

It is further defined that the current collecting column includes a positive electrode current collecting column and a negative electrode current collecting column, the electrode connector includes a positive electrode connector and a negative electrode connector, and the positive electrode current collecting column is connected to the positive electrode connector extending out of the casing. Welding, the negative electrode current collecting column is welded with the negative electrode connector extending out of the casing.

It is further limited that the current collecting column is provided with at least one return-shaped slot on the outer side surface of the casing, and the size of the return-shaped slot on the positive electrode current collecting column and the negative electrode current collecting column, The numbers are the same and the directions are opposite, so that the battery modules are connected in series with each other.

It is further limited that the number of return-shaped slots on the positive electrode current collecting column and the negative electrode current collecting column are both three, and the current collecting column is an aluminum or copper piece extruded at one time.

It is further limited that a plug is provided in the gap formed after the battery modules are connected in series through the return-shaped card slot.

It is further defined that the cross section of the tampon is rectangular, the cross-sectional area is greater than or equal to the area of the gap, and the tampon is tapered along the length direction to facilitate insertion into the gap.

Further limited, the plug strip is a heat pipe structure.

It is further defined that the positive and negative electrodes extend out of the casing through the connection between the casing and the cover, and are insulated and sealed with the casing and the cover through an insulating sealing ring.

Further limited, the positive and negative electrode connectors are provided with a plurality of openings for the sealing bolts to pass through, and the diameters of the openings are larger than the diameter of the rod body of the sealing bolts.

Further limited, the insulating sealing ring is provided with a plurality of openings for the sealing bolts to pass through, the diameter of the openings is the same as the diameter of the sealing bolts, and functions to insulate the positive and negative electrode connectors and the sealing bolts.

It is further limited that a downward notch is provided on the part of the positive and negative electrode connectors that protrudes from the casing, so that the positive and negative electrode connectors protrude from the side of the casing, and the upper part of the casing is provided with a flange, The flange is provided with a bolt hole, and the diameter of the bolt hole is the same as the diameter of the rod body of the sealing bolt.

It is further limited that the part protruding between the current collecting column and the flange and the cover body is provided with steps and filled with insulating material, and an insulating plate is provided between the current collecting column and the casing , to avoid direct contact between the positive and negative current collectors and the cell shell.

Compared with the prior art, the beneficial effects of the present invention are:

1. The present invention discloses the overall structure of a large-capacity battery, including at least one battery module. The battery module includes a casing, a cover, a battery pack, an electrode connector and a current collecting column. The battery pack is located in the casing, and the electrode The connecting pieces are respectively connected with the pole ears of the battery core group and the current collecting columns, and the current collecting columns are arranged on both sides outside the casing. The current collecting column is the place where the heat of the battery gathers. The current collecting column is arranged outside the battery casing, which can dissipate the heat in a timely and effective manner; at the same time, the internal space of the battery is saved, and the energy density of the large-capacity battery is greatly improved.

2. The electrode connector is in the shape of a flat plate, which greatly saves materials; by connecting the electrode and the collector column with the electrode connector, the stability of the connection can be effectively enhanced and the virtual connection can be prevented.

3. One end face of the electrode connector is welded with the tab of the cell group, and the other end face is welded with the current collector column, which increases the contact area of the electrode connector, the electrode tab and the current collector column, improves the current carrying capacity, and ensures that the Safety and stability of the overall structure of large-capacity batteries.

4. Adjacent battery modules are connected together by the loop-shaped card slot set on the current collecting column, and there is a plug in the gap of the loop-shaped slot. This connection method is convenient, fast, stable in structure, and simplified It eliminates the complicated connection process and saves parts.

5. The plug strip in the gap of the back-shaped slot can be a heat pipe structure, which is beneficial to dissipate the heat generated by the current collecting column in time while improving the connection stability.

6. The positive and negative connectors extend out of the casing through the connection between the casing and the cover, and are insulated and sealed with the casing and the cover through an insulating sealing ring, which enhances the insulation and sealing effect.

7. The shell, the cover body and the electrode connector are connected by sealing bolts, the connection method is efficient and simple, and the structural stability is strong.

8. The part protruding between the collecting column and the flange and the cover is provided with steps and filled with insulating materials, and an insulating plate is arranged between the collecting column and the shell, which can avoid the direct contact between the collecting column and the shell. , which improves the safety of the overall structure of the battery.

9. The battery modules can be connected in series through the loop-shaped card slot set on the current collecting column, which is convenient to design the number of battery modules to meet the capacity requirements of large batteries

Description of drawings

In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained according to these drawings without creative efforts.

1 is a schematic diagram of the overall structure of a large-capacity battery of the present invention;

FIG. 2 is a schematic structural diagram of the electrode lug of the battery cell and the positive and negative electrode connection pieces of the present invention;

3 is a schematic structural diagram of a positive and negative electrode connection piece of the present invention;

4 is a schematic structural diagram of a positive and negative electrode connecting piece and an insulating sealing ring according to the present invention;

FIG. 5 is a schematic diagram of the structure of the cell housing of the present invention;

6 is one of the schematic diagrams of the series structure of the large-capacity single cells of the present invention;

FIG. 7 is the second schematic diagram of the series structure of large-capacity single cells of the present invention.

Among them, 1—positive current collector column; 2—negative electrode current collector column; 3—shell; 4—negative electrode connector; 5—insulation sealing ring; 7—positive electrode connector; 8—cover body; 10—Positive tab; 11—Negative tab; 12—Positive connector opening; 13/14—Pole tab connection slot; 15—Negative connector opening; 16—Negative insulating sealing ring opening; 17—Positive Insulation sealing ring opening; 18—shell flange; 19/20—flange step of the protruding part of positive and negative electrode connectors; 21—flange bolt hole; 22—insulation plate between the case and the collector column; 23—the step between the current collecting column and the flange; 41—the first unit cell; 42—the second unit battery; 43—the positive current collecting column of the first unit battery; 44—the first unit battery negative electrode current collecting Column; 45—plug strip; 46—positive current collecting column of the second unit cell; 47—negative current collecting column of the second unit battery; 31/32/33—upward return slot; Downward snapback slot.

Detailed ways

The present invention will be further described in detail below with reference to the accompanying drawings, so that those skilled in the art can implement it with reference to the description.

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

It should be understood that directional nouns such as "up" and "down" used herein are described according to the accompanying drawings in the description, so as to better understand the technical solutions of the present invention.

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

The invention discloses an overall structure of a large-capacity battery, including at least one battery module, the battery module includes a casing 3, a cover body 8, a battery cell group 9, an electrode connector 4/7 and a current collecting column 1/2. The core group 9 is located in the casing 3 , and the electrode connectors 4 / 7 are respectively connected with the tabs of the battery core group 9 and the current collecting column 1 / 2 , and the current collecting column 1 / 2 is arranged on both sides outside the casing 3 . The cell group 9 is composed of at least one cell, and the positive and negative ears of the cell group 9 are located on the same side of the cell group 9 and are connected to the electrode connector 4/7. A plurality of groups of through grooves 13/14 are arranged on one long side of the electrode connector 4/7. The positive and negative electrodes of the cell group 9 pass through the through grooves and are bent vertically and welded to the electrode connector 4/7. The current collecting column includes a positive electrode current collecting column 1 and a negative electrode current collecting column 2, and the electrode connecting member includes a positive electrode connecting member 7 and a negative electrode connecting member 4. The flow column 2 is welded to the negative terminal 4 extending out of the casing 3 . The current collecting column 1/2 is provided with at least one loop-shaped slot on the outer side of the casing 3. The size and number of the loop-shaped slot on the positive electrode current collecting column 1 and the negative electrode current collecting column 2 are the same, and the directions are opposite, so that the The battery modules are connected in series with each other. The number of the back-shaped card slots on the positive electrode current collecting column 1 and the negative electrode current collecting column 2 are both 3, and 1/2 of the current collecting column is an aluminum part or a copper part extruded at one time. A plug 45 is provided in the gap formed after the batteries are connected and connected in series through the return slot. The plug strip 45 has a rectangular cross-section, and the cross-sectional area is greater than or equal to the area of the gap. The plug strip 45 has a wedge along the length direction, which is convenient to be inserted into the gap. The plug 45 is a heat pipe structure. The positive and negative connectors 4/7 protrude out of the casing 3 through the connection between the casing 3 and the cover 8, and are insulated and sealed with the casing 3 and the cover 8 through the insulating sealing ring 5. The positive and negative electrode connectors 4/7 are provided with a plurality of openings 12/15 for the sealing bolts to pass through, and the diameter of the openings is larger than the diameter of the rod body of the sealing bolts. The insulating sealing ring 5 is provided with a plurality of openings 16/17 for the sealing bolts to pass through. The diameter of the openings is the same as the diameter of the sealing bolts, and plays the role of insulating the electrode connector and the sealing bolts. A downward notch is provided on the part of the positive and negative electrode connecting piece 4 that protrudes from the casing 3, so that the positive and negative electrode connecting piece 4 extends out of the side of the casing 3. The upper part of the casing 3 is provided with a flange 18. A bolt hole 21 is provided, and the diameter of the bolt hole 21 is the same as the diameter of the rod body of the sealing bolt. The part protruding between the current collecting column 1/2 and the flange and the cover body 8 is provided with a step 23 and filled with insulating material, and an insulating plate 22 is provided between the current collecting column and the shell 3 to avoid the current collecting column 1 /2 is in direct contact with shell 3.

Example 1

1-2, the present embodiment shows the overall structure of a large-capacity battery, which includes two battery modules, the battery module includes a casing 3, a cover 8, a battery pack 9, electrode connectors 4/7 and The current collecting column 1/2, the battery cell group 9 is located in the casing 3, one end of the electrode connector 4/7 is connected to the tab of the battery core group 9, and the other end is connected to the current collecting column 1/2, the current collecting column 1/ 2 are arranged on both sides of the exterior of the casing 3 .

It should be noted that the number of battery modules in this embodiment may be 1, 2, 3, 4 or more, and the specific number may be designed according to the electric capacity requirement of the large-capacity battery. The technical solution of this embodiment sets the current collecting column 1/2 outside the battery casing 3, which can dissipate heat in a timely and effective manner; meanwhile, the internal space of the battery is saved, and the energy density of the large-capacity battery is greatly improved.

Example 2

Referring to FIGS. 1 to 4 , this embodiment shows the overall structure of a large-capacity battery. On the basis of Embodiment 1, the cell group 9 is a laminated cell group, and the positive electrode of the laminated cell group is The tabs 10 and the negative tabs 11 are both located on the same side of the battery pack 9, and the positive tabs 10 and the negative tabs 11 pass through the through slots 13/14 on the positive connector 7 and the negative connector 4 respectively and are connected at the electrodes. After the upper end face of the piece is bent vertically, the positive and negative electrodes 10/11 and the positive and negative connecting pieces 4/7 are welded together. Referring to FIG. 2, the electrode connector is a flat plate structure, which is extended from the through grooves 13/14 on the positive and negative connectors 4/7, the bolt holes 12/15 for the positive and negative connectors, and the positive and negative connectors 4/7. Parts of housing 3.

Preferably, the material of the electrode connector 4/7 is metal, which may be aluminum alloy or pure copper.

Example 3

Referring to FIGS. 1 to 5 , this embodiment shows the overall structure of a large-capacity battery. On the basis of Embodiment 2, its current collecting column is divided into a positive current collecting column 1 and a negative electrode current collecting column 2, wherein the positive current collecting column The column 1 is welded with the positive electrode connector 7 protruding from the side of the casing 3 , and the negative electrode current collecting column 2 is welded with the negative electrode connector 4 protruding from the side of the casing 3 .

It should be noted that the electrode connector in this embodiment is flat, which greatly saves materials; by connecting the electrode connector to the electrode tab and the current collecting column, the stability of the connection can be effectively enhanced, and virtual connections can be effectively prevented. One end face of the electrode connector 4/7 is welded with the tab of the cell group, and the other end face is welded with the current collecting column 1/2, which increases the contact area of the electrode connector, the electrode lug and the current collecting column, and improves the load carrying capacity. flow capacity to ensure the safety and stability of the overall structure of the large-capacity battery.

Example 4

Referring to FIGS. 1 to 7 , this embodiment shows the overall structure of a large-capacity battery. On the basis of Embodiment 3, the current collecting column 1/2 is provided with a return-shaped slot 31 relative to the outer side of the casing 3 /32/33/71/72/73, the size and number of the positive current collecting column 1 and the negative current collecting column 2 are the same, and the direction is opposite, which is convenient for the battery The modules are connected in series with each other.

Preferably, both the positive electrode current collecting column 1 and the negative electrode current collecting column 2 have three return-shaped clamping grooves.

Preferably, the current collecting column 1/2 is an aluminum part or a copper part extruded at one time.

Preferably, a plug strip 45 is provided in the gap formed after the battery modules are connected in series by the back-shaped card slots 31/32/33/71/72/73. The plug strip 45 has a rectangular cross-section, and the cross-sectional area is greater than or equal to the area of the gap. , the plug strip 45 has a wedge along the length direction, which is convenient to be inserted into the gap.

Preferably, the tampon 45 can be a heat pipe structure, which is convenient to quickly dissipate the heat generated by 1/2 of the current collecting column.

It should be noted that the connection method of the technical solution in this embodiment is convenient, quick, and structurally stable, which simplifies the complicated connection process, saves parts, improves the connection stability, and facilitates the timely connection of 1/2 of the current collecting column. The heat generated is dissipated.

Example 5

This embodiment shows the overall structure of a large-capacity battery. On the basis of Embodiment 4, the positive and negative electrode connectors 4/7 protrude from the casing 3 through the connection between the casing 3 and the cover 8, and The housing 3 and the cover body 8 are insulated and sealed by the insulating sealing ring 5 .

Preferably, a plurality of openings 12/15 are provided on the positive and negative connectors 4/7 for the sealing bolts to pass through, and the diameters of the openings 12/15 are larger than the diameter of the rod body of the sealing bolts.

Preferably, the insulating sealing ring 5 is provided with a plurality of openings 16/17 for the sealing bolts to pass through, and the diameters of the openings 16/17 are the same as the diameters of the sealing bolts, so as to insulate the electrode connector and the sealing bolts.

Preferably, the portion of the positive and negative electrode connectors 4 extending out of the casing 3 is provided with a downward notch, so that the positive and negative electrode connectors 4 extend out of the side of the box body, and the upper part of the casing 3 is provided with a flange 18, and the flange There are bolt holes 21 on it, and the diameter of the bolt holes 21 is the same as the diameter of the rod body of the sealing bolt.

Preferably, the part protruding between the current collecting column 1/2 and the flange 18 and the cover body 8 is provided with a step 23 and filled with insulating material, and an insulating plate is provided between the current collecting column 1/2 and the casing 3 22. Avoid direct contact between the current collecting column 1/2 and the casing 3.

It should be noted that an insulating sealing ring 5 is provided on the part of the positive and negative electrode connectors 4/7 extending out of the casing 3, and the holes 16 passing through the bolts are provided on the insulating sealing ring 5 at the positions corresponding to the positive and negative electrode connectors 4/7. /17, the diameter of the through hole 12/15 through the bolt on the positive and negative electrode connector 4/7 provided by the present invention is larger than the diameter of the corresponding hole 16/17 on the insulating sealing ring 5 by 2-3 mm. The diameter of the bolt holes 16/17 on the insulating sealing ring 5 is the same as the diameter of the screw of the fixing bolt, so that the fixing screw and the positive and negative electrodes 4/7 are insulated from each other through the insulating sealing ring 5.

It should be noted that a flange 18 is provided on the upper part of the housing 3, and a downward notch is provided on the part of the positive and negative electrode connectors 4/7 that protrudes from the housing 3, so that the positive and negative electrode connectors 4/7 protrude from the housing 3 The upper side of the positive and negative electrode connectors 4/7 and the insulating sealing ring 5 are basically flush with the flange on the upper part of the notch of the casing 3. The flanges around the casing 3 are provided with a number of bolt holes, and the diameter of the bolt holes is the same as The diameters of the sealing screws are the same, so that the fixing screws and the positive and negative electrodes 4/7 can also be insulated from each other through the insulating sealing ring 5 . When the battery pack 9 is placed in the casing 3, the positive and negative connectors 4/7 with the insulating sealing ring 5 will be placed in the downward notch on both sides of the casing 3, and the part above the notch is basically the same In this embodiment, an O-shaped sealing strip is set on this plane, and the cover body 8, the positive and negative electrode connectors 4/7 and the casing 3 are sealed together at one time through the cover body 8 and the fixed sealing bolts, thereby forming Complete battery housing 3.

It should be noted that steps can be set on the part protruding between the current collecting column 1/2, the cell shell flange 18 and the cover body 8, and insulating materials can be filled to avoid the positive and negative current collecting column 1/2 Direct contact with the cell housing 3 .

Example 6

This embodiment shows the overall structure of a large-capacity battery. On the basis of Embodiment 5, the positive electrode tabs 10 and the negative electrode tabs 11 of the laminated battery pack 9 may be located on two opposite sides of the battery pack 9 respectively. , the positive electrode tab 10 and the negative electrode tab 11 pass through the through grooves 13/14 on the positive electrode connector 7 and the negative electrode connector 4 respectively, and the positive and negative electrodes are vertically bent on the upper end face of the positive and negative electrode connector 4/7. The ears 10/11 and the positive and negative electrode connectors 4/7 are respectively welded together correspondingly.

It should be noted that the positive and negative connectors 4/7 corresponding to the battery cell group 9 in this embodiment are L-shaped structures, and the positive and negative connectors 4/7 are formed by the through slots 13/14 on the connector, the positive and negative connectors 4/7. The bolt holes 12/15 of the pole connector and the parts of the positive and negative connectors 4/7 that extend out of the casing 3 are different from the positive and negative connectors of the flat plate structure in that the bolt holes 12/7 of the positive and negative connectors 15 is vertically bent with the middle part of the through grooves 13/14 on the positive and negative connectors to form an L-shaped positive and negative connector, and other structures remain unchanged.

Example 7

Referring to FIGS. 6-7 , this embodiment shows the overall structure of a large-capacity battery. On the basis of Embodiment 5, the battery modules are connected in series in the following manner. The positive electrode current collecting column 43/46 and the negative electrode current collecting column 44/47 of the single battery 41/42 are both arranged on the two sides of the battery body, and the positive current collecting column 43/46 is provided with three upward return-shaped slots. 31/32/33, three corresponding downward return-shaped card slots 71/72/73 are set on the negative electrode current collecting column. The size and dimensions of the upward return-shaped card slot 31/32/33 are exactly the same as those of the downward return-shaped card slot 71/72/73, and its shape is chiral symmetry.

When the first single battery 41 and the second single battery 42 are connected in series, the negative electrode current collecting column 44 of the first single battery 41 and the positive electrode current collecting column 46 of the second single battery 42 are close to each other, and the first single battery The downward looping grooves 71/72/73 on the negative current collecting column 44 of the bulk battery 41 and the upward looping grooves 31/32/33 on the positive current collecting column 46 of the second single battery 42 are mutually Nested together, as shown in Figure 6. The plug 45 shown in FIG. 7 is inserted into the hole formed after the negative electrode current collector 44 of the first unit cell 41 and the positive electrode current collector 46 of the second unit cell 42 are nested, so that the unit The batteries 41/42 are connected in series, the structure is simple, the operation is convenient, and the stability is strong.

The above content is a further detailed description of the present invention in conjunction with specific preferred embodiments, and is not intended to limit the present invention. For those skilled in the art, without departing from the concept of the present invention, some simple deductions can also be made. Or replacement, any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be regarded as belonging to the patent protection scope of the present invention determined by the submitted claims.

Claims (14)

1. The utility model provides an overall structure of large capacity battery, includes at least one battery module, its characterized in that, battery module includes casing, lid, electric core group, electrode connecting piece and current collection post, the electric core group is located in the casing, electrode connecting piece's both ends respectively with the utmost point ear of electric core group and the current collection post is connected, the current collection post set up in the outside both sides of casing.

2. The overall structure of a large-capacity battery as claimed in claim 1, wherein the cell group is composed of at least one cell, and the positive and negative electrode tabs of the cell group are located on the same side of the cell group and connected to the electrode connecting member.

3. The overall structure of a large-capacity battery according to claim 1, wherein a plurality of groups of through grooves are formed on a long side of one surface of the electrode connection member, and the positive and negative electrode tabs of the battery cell group pass through the through grooves and are welded to the electrode connection member after being bent vertically.

4. The unitary structure of a large-capacity battery as claimed in claim 1, wherein the current collecting post comprises a positive current collecting post and a negative current collecting post, the electrode connection member comprises a positive connection member and a negative connection member, the positive current collecting post is welded to the positive connection member protruding out of the case, and the negative current collecting post is welded to the negative connection member protruding out of the case.

5. The overall structure of a large-capacity battery as claimed in claim 4, wherein the current collecting columns are provided with at least one clip groove on the outer side of the case, and the clip grooves have the same size and number and opposite directions on the positive current collecting columns and the negative current collecting columns, so that the battery modules are connected in series with each other.

6. The overall structure of a large-capacity battery as defined in claim 5, wherein the number of the clip grooves on the positive current collecting post and the negative current collecting post is 3, and the current collecting post is an aluminum or copper member formed by one-step extrusion.

7. The overall structure of a large-capacity battery according to claim 5, wherein a plug strip is arranged in a gap formed after the battery modules are connected in series in a clamping manner through the clip grooves.

8. The unitary structure of a large capacity battery as claimed in claim 7, wherein the cross section of the plug is rectangular, the cross sectional area is greater than or equal to the area of the gap, and the plug has a taper in the length direction to facilitate insertion into the gap.

9. The integrated structure of a large capacity battery as claimed in claim 7, wherein the stopper bar is a heat pipe structure.

10. The unitary structure of a large-capacity battery as claimed in claim 1, wherein the positive and negative electrode connecting members extend out of the case through the junction between the case and the lid, and are sealed in an insulating manner with the case and the lid by insulating sealing rings.

11. The structure of a large-capacity battery as claimed in claim 1, wherein the positive and negative electrode connecting members are formed with a plurality of openings for the sealing bolts to pass through, and the diameter of the openings is larger than the diameter of the shaft body of the sealing bolts.

12. The unitary structure of a large capacity battery as claimed in claim 10, wherein the insulating gasket is provided with a plurality of openings for passing sealing bolts therethrough, the diameter of the openings being the same as that of the sealing bolts.

13. A large capacity battery as defined in claim 10, wherein the positive and negative electrode connecting members are provided with downward notches at portions thereof extending out of the case so that the positive and negative electrode connecting members extend out of the side edges of the case, a flange is provided at the upper portion of the case, and bolt holes having the same diameter as the diameter of the sealing bolts are provided in the flange.

14. The unitary structure of a large capacity battery as claimed in claim 13, wherein the portions of the current collecting post protruding from the flanges and the lid are stepped and filled with an insulating material, and an insulating plate is disposed between the current collecting post and the case to prevent the current collecting post from directly contacting the case.

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