CN217361808U

CN217361808U - Integral structure of large-capacity battery

Info

Publication number: CN217361808U
Application number: CN202123429321.8U
Authority: CN
Inventors: 郑高锋; 雷政军; 刘毅; 雷玮; 韩晓宇
Original assignee: Shaanxi Olympus Power Energy Co Ltd
Current assignee: Shaanxi Olympus Power Energy Co Ltd
Priority date: 2021-12-31
Filing date: 2021-12-31
Publication date: 2022-09-02
Anticipated expiration: 2031-12-31

Abstract

The utility model discloses an overall structure of large capacity battery belongs to the battery field, including at least one battery module, battery module includes casing, lid, electric core group, electrode connecting piece and mass flow post, and the electric core group is located the casing, and electrode connecting piece's both ends are connected with the utmost point ear and the mass flow post of electric core group respectively, and the mass flow post sets up in the outside both sides of casing. The current collecting column is arranged outside the battery shell, so that heat can be effectively dissipated in time; 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 batteries are connected in series, the current collecting columns on the two sides of the batteries are provided with the clip-shaped clamping grooves with equal quantity and opposite directions, so that a plurality of high-capacity batteries are connected in series and clamped together. According to the series connection mode, on one hand, the connection between large-capacity batteries through a wire is omitted, materials are saved, on the other hand, the contact area of the current collecting columns between the adjacent batteries is increased, the connection line heating between the batteries is reduced, and the safety of the batteries is improved.

Description

Integral structure of large-capacity battery

Technical Field

The utility model relates to a battery field especially relates to an overall structure of large capacity 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 omits 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 generation in the application process, large heat release and the like.

CN101931098A discloses a square battery, which comprises a casing, a safety valve is arranged on the top of the casing, a pole piece and a tab are arranged in the casing, the positive and negative poles of the pole piece are respectively connected with the positive and negative terminals of the tab, the other ends of the positive and negative terminals of the tab are respectively connected with a positive current collecting column and a negative current collecting column, the positive and negative current collecting columns are set as horizontal current collecting columns, and the positive and negative current collecting columns are respectively connected with the positive and negative terminals of the tab horizontally. However, the current collecting column of the patent does not directly extend out of the housing, the heat dissipation effect is not good, and the series connection of a plurality of batteries cannot be realized.

CN107658489A discloses a fuel cell module convenient for installation and disassembly, which comprises a fluid distributor, front and rear baffles, a fuel cell soft package, a battery soft package connecting strip and a strapping tape; the fuel cell soft package comprises a type I fuel cell soft package and a type II fuel cell soft package; after being respectively integrated with the front baffle and the rear baffle, the front baffle and the rear baffle are fixed by strapping tapes; the n fuel cell soft packages are overlapped at intervals according to the type I fuel cell soft package and the type II fuel cell soft package in sequence and are connected in series, and then a fluid distributor is arranged in front of the front baffle; and bound with a binding tape to form a whole, and the fuel cell module is assembled. However, the patent only shows that the electrodes extend out of the shell, so that a good heat dissipation effect cannot be achieved, the space in the battery cannot be saved, and the energy density is low; although the serial connection is realized, the serial connection structure is not stable enough and is not beneficial to heat dissipation.

Disclosure of Invention

In order to solve the problem, the utility model discloses a large capacity battery's overall structure, concrete technical scheme is as follows:

the utility model discloses an overall structure of large capacity battery, including at least one battery module, battery module includes casing, lid, electric core group, electrode connecting piece and mass flow post, the electric core group is located in the casing, the both ends of electrode connecting piece respectively with the utmost point ear of electric core group and mass flow column connection, the mass flow post set up in the outside both sides of casing.

Further limited, the electric core group is composed of at least one electric core, and the positive and negative electrode ears of the electric core group are positioned at the same side of the electric core group and connected with the electrode connecting piece.

Further inject, be equipped with multiunit logical groove on the long limit of one side of electrode connecting piece, the positive and negative pole ear of electric core group passes logical groove and weld after bending perpendicularly on the electrode connecting piece.

Further limited, the current collecting post comprises a positive current collecting post and a negative current collecting post, the electrode connecting piece comprises a positive connecting piece and a negative connecting piece, the positive current collecting post is welded with the positive connecting piece extending out of the shell, and the negative current collecting post is welded with the negative connecting piece extending out of the shell.

Further, the outer side surface of the current collecting column, which is opposite to the shell, is provided with at least one clip groove, the clip grooves have the same size and number on the positive current collecting column and the negative current collecting column, and the directions are opposite, so that the battery modules are connected in series.

Further limiting, the number of the clip grooves on the positive current collecting column and the negative current collecting column is 3, and the current collecting column is an aluminum piece or a copper piece formed by one-time extrusion.

Further limiting, a plug strip is arranged in a gap formed after the battery modules are connected in series through the clip-shaped clamping grooves in a clamping mode.

Further limiting, the section of the plug strip is rectangular, the area of the section is larger than or equal to that of the gap, and the plug strip is provided with a wedge degree along the length direction, so that the plug strip can be plugged into the gap conveniently.

Further defined, the plug strip is of a heat pipe structure.

Further, the electrode connecting piece extends out of the shell through the joint between the shell and the cover body and is in insulation sealing with the shell and the cover body through an insulation sealing ring.

Further, a plurality of openings are formed in the electrode connecting piece so that the sealing bolts can penetrate through the openings, and the diameter of each opening is larger than the diameter of the rod body of each sealing bolt.

Further, the insulating sealing ring is provided with a plurality of openings for the sealing bolt to pass through, and the diameter of the openings is the same as that of the sealing bolt, so that the insulating electrode connecting piece and the sealing bolt are used.

Further limiting, a downward notch is formed in the part, extending out of the shell, of the electrode connecting piece, so that the electrode connecting piece extends out of the side edge of the shell, a flange is arranged on the upper portion of the shell, a bolt hole is formed in the flange, and the diameter of the bolt hole is the same as that of the rod body of the sealing bolt.

Further limiting, steps are arranged on the parts extending out between the current collecting column and the flange and between the current collecting column and the cover body, insulating materials are filled in the steps, and an insulating plate is arranged between the current collecting column and the shell to prevent the positive and negative current collecting columns from being in direct contact with the battery cell shell.

Compared with the prior art, the beneficial effects of the utility model reside in that:

1. the utility model discloses an overall structure of large capacity battery, including at least one battery module, battery module includes casing, lid, electric core group, electrode connecting piece and mass flow post, and the electric core group is located the casing, and the electrode connecting piece is connected with the utmost point ear and the mass flow post of electric core group respectively, and the mass flow post sets up in the outside both sides of casing. The current collecting column is a heat collecting part of the battery, and the current collecting column is arranged outside the battery shell and can effectively dissipate heat in time; meanwhile, the internal space of the battery is saved, and the energy density of the large-capacity battery is greatly improved.

2. The electrode connecting piece is in a flat plate shape, so that materials are greatly saved; the electrode connecting piece is used for connecting the electrode with the current collecting column, so that the connection stability can be effectively enhanced, and virtual connection is prevented.

3. One end face of the electrode connecting piece is welded with the lug of the electric core group, and the other end face of the electrode connecting piece is welded with the current collecting column, so that the contact area of the electrode connecting piece, the lug and the current collecting column is increased, the current carrying capacity is improved, and the safety and the stability of the integral structure of the large-capacity battery are ensured.

4. The adjacent battery modules are connected together in a clamped mode through the clip-shaped clamping grooves arranged on the current collecting column, the plug strips are arranged in gaps of the clip-shaped clamping grooves, the connection mode is convenient and fast, the structure is stable, the complex connection process is simplified, and parts are saved.

5. The plug strip in the gap of the clip groove can be of a heat pipe structure, so that the connection stability is improved, and meanwhile, the heat generated by the collecting column is dissipated in time.

6. The electrode connecting piece extends out of the shell through the joint between the shell and the cover body, and is insulated and sealed with the shell and the cover body through the insulating sealing ring, so that the insulating sealing effect is enhanced.

7. The shell, the cover body and the electrode connecting piece are connected through the sealing bolt, the connecting mode is efficient and simple, and the structural stability is strong.

8. The part that stretches out between current collection post and flange and the lid is equipped with the step to it has insulating material to fill, is equipped with the insulation board between current collection post and the casing, can avoid current collection post and casing direct contact, has improved battery overall structure's security.

9. The battery modules can be connected in series through the clip grooves arranged on the current collecting column, so that the quantity of the battery modules can be conveniently designed to meet the capacity requirement of a large battery

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic view of the overall structure of the high-capacity battery of the present invention;

FIG. 2 is a schematic view of the structure of the cell tab and the positive and negative connecting sheets of the present invention;

FIG. 3 is a schematic view of the structure of the positive and negative connecting sheets of the present invention;

FIG. 4 is a schematic view of the structure of the positive and negative connecting sheets and the insulating sealing ring of the present invention;

fig. 5 is a schematic diagram of the structure of the cell casing of the present invention;

FIG. 6 is a schematic view of a series structure of large capacity single batteries according to the present invention;

fig. 7 is a second schematic diagram of the series structure of the large capacity single battery according to the present invention.

Wherein, 1-positive pole current collecting column; 2-negative current collecting column; 3, a shell; 4-negative pole connecting piece; 5, insulating a sealing ring; 7-positive electrode connecting piece; 8, a cover body; 9, a cell group; 10-positive pole tab; 11-negative pole tab; 12-opening a positive connecting piece; 13/14-tab connection through groove; 15-opening a hole on the negative electrode connecting piece; 16-opening a hole in the negative insulating sealing ring; 17-opening a hole in the anode insulating seal ring; 18-housing flange; 19/20-Flange step of electrode connector extension; 21-flange bolt holes; 22-an insulating plate between the shell and the current collecting column; 23, a step between the collecting column and the flange; 41-a first cell; 42-a second cell; 43-a first cell positive collector column; 44-a first cell negative collector column; 45-plugging strips; 46-second single battery positive collector column; 47-second cell negative collector column; 31/32/33-upward clip groove; 71/72/73-downward clip groove.

Detailed Description

The present invention is further described in detail below with reference to the drawings so that those skilled in the art can implement the invention with reference to the description.

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 the directional terms such as "upper" and "lower" used herein are illustrated according to the drawings of the specification so as to facilitate better understanding of the technical aspects of the present invention.

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

The utility model discloses an overall structure of large capacity battery, including at least one battery module, battery module includes casing 3, lid 8, electric core group 9, electrode connecting piece 4/7 and current collection post 1/2, and electric core group 9 is located casing 3, and electrode connecting piece 4/7 is connected with electric core group 9's utmost point ear and current collection post 1/2 respectively, and current collection post 1/2 sets up in the outside both sides of casing 3. The electric core group 9 is composed of at least one electric core, and the positive and negative electrode ears of the electric core group 9 are positioned at the same side of the electric core group 9 and are connected with the electrode connecting piece 4/7. A plurality of groups of through grooves 13/14 are arranged on the long edge of one surface of the electrode connecting piece 4/7, and the positive and negative electrode ears of the electric core group 9 penetrate through the through grooves and are welded on the electrode connecting piece 4/7 after being vertically bent. The collecting column comprises a positive collecting column 1 and a negative collecting column 2, the electrode connecting piece comprises a positive connecting piece 7 and a negative connecting piece 4, the positive collecting column 1 is welded with the positive connecting piece 7 extending out of the shell 3, and the negative collecting column 2 is welded with the negative connecting piece 4 extending out of the shell 3. The current collecting columns 1/2 are provided with at least one clip groove on the outer side of the shell 3, the size and the number of the clip grooves on the positive current collecting column 1 and the negative current collecting column 2 are the same, and the directions are opposite, so that the battery modules are connected in series. The number of the clip grooves on the positive current collecting column 1 and the negative current collecting column 2 is 3, and the current collecting column 1/2 is an aluminum piece or a copper piece formed by one-time extrusion. The battery is provided with a plug strip 45 in a gap formed after the batteries are connected in series through the clip groove. The section of the plugging strip 45 is rectangular, the area of the section is larger than or equal to that of the gap, and the plugging strip 45 has wedge degrees along the length direction, so that the plugging strip can be plugged into the gap conveniently. The plug strip 45 is a heat pipe structure. The electrode connector 4/7 protrudes from the case 3 through the joint between the case 3 and the lid 8, and is sealed with the case 3 and the lid 8 by the insulating gasket 5. The electrode connector 4/7 is provided with a plurality of openings 12/15 for the passage of sealing bolts, the diameter of the openings being greater than the diameter of the shaft of the sealing bolts. The insulating seal ring 5 is provided with a plurality of openings 16/17 for the sealing bolts to pass through, and the diameter of the openings is the same as that of the sealing bolts, so that the openings play the roles of insulating electrode connecting pieces and the sealing bolts. A downward notch is formed in the part, extending out of the shell 3, of the electrode connecting piece 4, so that the electrode connecting piece 4 extends out of the side edge of the shell 3, a flange 18 is arranged on the upper portion of the shell 3, a bolt hole 21 is formed in the flange, and the diameter of the bolt hole 21 is the same as that of a rod body of a sealing bolt. The part that stretches out between current collection post 1/2 and flange and lid 8 is equipped with step 23 to it fills with insulating material, is equipped with insulation board 22 between current collection post and the casing 3, avoids current collection post 1/2 and casing 3 direct contact.

Example 1

Referring to fig. 1-2, the present embodiment shows an overall structure of a large-capacity battery, which includes 2 battery modules, each battery module includes a housing 3, a cover 8, a cell group 9, an electrode connector 4/7 and a current collecting column 1/2, the cell group 9 is located in the housing 3, one end of the electrode connector 4/7 is connected to a tab of the cell group 9, the other end is connected to the current collecting column 1/2, and the current collecting columns 1/2 are disposed at two sides of the exterior of the housing 3.

It should be noted that the number of the battery modules in this embodiment may be 1, 2, 3, 4 or more, and the specific number may be designed according to the capacity requirement of the large-capacity battery. According to the technical scheme of the embodiment, the current collecting column 1/2 is arranged outside the battery shell 3, so that heat can be effectively dissipated in time; 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 fig. 1-4, this embodiment shows an overall structure of a large-capacity battery, based on embodiment 1, the core pack 9 is a laminated core pack, the positive tab 10 and the negative tab 11 of the laminated core pack are both located on the same side of the core pack 9, the positive tab 10 and the negative tab 11 respectively pass through the through slots 13/14 on the positive connector 7 and the negative connector 4, and the positive tab 10/11 and the negative tab 4/7 are welded together after the upper end surface of the electrode connectors is vertically bent. Referring to fig. 2, the electrode connector is a flat plate structure, and is composed of a through slot 13/14 on the electrode connector 4/7, an electrode connector bolt hole 12/15, and a portion of the electrode connector 4/7 protruding out of the housing 3.

Preferably, the material of the electrode connecting member 4/7 is metal, and may be aluminum alloy or pure copper.

Example 3

Referring to fig. 1 to 5, the present embodiment shows an overall structure of a large capacity battery, and based on embodiment 2, the current collecting column is divided into a positive current collecting column 1 and a negative current collecting column 2, wherein the positive current collecting column 1 is welded to a positive connecting member 7 extending out of the side of a case 3, and the negative current collecting column 2 is welded to a negative connecting member 4 extending out of the side of the case 3.

It should be noted that, the electrode connecting piece in the embodiment is in a flat plate shape, so that materials are greatly saved; the electrode connecting piece connects the electrode lug with the current collecting column, so that the connection stability can be effectively enhanced, and virtual connection can be effectively prevented. One end face of the electrode connecting piece 4/7 is welded with the tab of the electric core group, and the other end face is welded with the current collecting column 1/2, so that the contact area of the electrode connecting piece, the tab and the current collecting column is increased, the current carrying capacity is improved, and the safety and the stability of the integral structure of the large-capacity battery are ensured.

Example 4

Referring to fig. 1-7, this embodiment shows an overall structure of a large-capacity battery, and based on embodiment 3, the current collecting posts 1/2 are provided with clip slots 31/32/33/71/72/73 corresponding to the outer side of the housing 3, and the clip slots 31/32/33/71/72/73 have the same size, number and opposite directions on the positive current collecting post 1 and the negative current collecting post 2, so as to facilitate the serial connection of the battery modules.

Preferably, the number of the clip grooves on the positive current collecting column 1 and the negative current collecting column 2 is 3.

Preferably, the current collector 1/2 is a one-shot extruded aluminum or copper piece.

Preferably, the battery modules are connected in series through the clip grooves 31/32/33/71/72/73 to form the gaps, the plug strips 45 are arranged in the gaps, the cross sections of the plug strips 45 are rectangular, the cross section areas are larger than or equal to the areas of the gaps, and the plug strips 45 have wedge degrees along the length direction, so that the plug strips can be conveniently plugged into the gaps.

Preferably, the plug 45 may be a heat pipe structure to facilitate rapid removal of heat generated by the current collector column 1/2.

It should be noted that the connection mode in the embodiment is convenient and fast, and has a stable structure, thereby simplifying a complicated connection process, saving parts, and being beneficial to dissipating heat generated by the current collecting column 1/2 in time while improving connection stability.

Example 5

This embodiment shows an overall structure of a large-capacity battery, and on the basis of embodiment 4, its electrode connector 4/7 protrudes from case 3 through the joint between case 3 and lid 8, and is sealed in insulation from case 3 and lid 8 by insulating seal ring 5.

Preferably, electrode connector 4/7 has a plurality of openings 12/15 for the passage of sealing bolts, opening 12/15 having a diameter greater than the diameter of the shank of the sealing bolt.

Preferably, the insulating gasket 5 is provided with a plurality of openings 16/17 for the sealing bolts to pass through, and the opening 16/17 has the same diameter as the sealing bolts and functions as an insulating electrode connecting member and a sealing bolt.

Preferably, the part of the electrode connecting piece 4 extending out of the shell 3 is provided with a downward notch, so that the electrode connecting piece 4 extends out of the side edge of the box body, the upper part of the shell 3 is provided with a flange 18, the flange is provided with a bolt hole 21, and the diameter of the bolt hole 21 is the same as that of the rod body of the sealing bolt.

Preferably, the protruding portion between the current collecting column 1/2 and the flange 18 and the cover 8 is provided with a step 23 and filled with an insulating material, and an insulating plate 22 is provided between the current collecting column 1/2 and the housing 3 to prevent the current collecting column 1/2 from directly contacting the housing 3.

It should be noted that, the part that electrode connecting piece 4/7 stretches out casing 3 sets up insulating sealing ring 5, and the position that corresponds with electrode connecting piece 4/7 on the insulating sealing ring 5 sets up the hole 16/17 of passing the bolt, the utility model provides a diameter of the through-hole 12/15 that passes the bolt on the electrode connecting piece 4/7 is greater than the diameter 2 ~ 3mm that corresponds hole 16/17 on the insulating sealing ring 5. The diameter of the bolt hole 16/17 on the insulating seal ring 5 is the same as the diameter of the screw of the fixing bolt, so that the fixing screw and the electrode connecting member 4/7 are insulated from each other by the insulating seal ring 5.

It should be noted that, a flange 18 is provided on the upper portion of the housing 3, a downward notch is provided on the portion of the electrode connector 4/7 extending out of the housing 3, so that the electrode connector 4/7 extends out of the side of the housing 3, the upper edge of the electrode connector 4/7 and the upper edge of the insulating seal ring 5 are substantially flush with the flange on the upper portion of the notch of the housing 3, and a plurality of bolt holes are provided on the flange around the housing 3, and the diameter of the bolt holes is the same as the diameter of the seal screw, so that the fixing screw and the electrode connector 4/7 are also insulated from each other by the insulating seal ring 5. When the cell group 9 is inserted into the casing 3, the electrode connecting piece 4/7 with the insulating sealing ring 5 is inserted into the downward notches on both sides of the casing 3, the parts above the notches are substantially in the same plane, in this embodiment, an O-shaped sealing strip is arranged on the plane, and the cover 8, the electrode connecting piece 4/7 and the casing 3 are sealed together at one time through the cover 8 and the fixing sealing bolts, so as to form the complete battery outer casing 3.

It should be noted that a step may be provided at the portion extending between the current collecting post 1/2 and the cell casing flange 18 and the cover 8, and an insulating material may be filled to prevent the positive and negative current collecting posts 1/2 from directly contacting the cell casing 3.

Example 6

This embodiment shows an overall structure of a large-capacity battery, based on embodiment 5, the positive tab 10 and the negative tab 11 of the laminated core pack 9 can be respectively located on two opposite sides of the core pack 9, the positive tab 10 and the negative tab 11 respectively pass through the through slots 13/14 on the positive connector 7 and the negative connector 4, and the positive tab 10/11 and the negative tab 4/7 are respectively and correspondingly welded together after the upper end face of the electrode connector 4/7 is vertically bent.

It should be noted that the electrode connecting member 4/7 corresponding to the electric core pack 9 in this embodiment is an L-shaped structure, and the electrode connecting member 4/7 is composed of a through slot 13/14 on the connecting member, an electrode connecting member bolt hole 12/15, and a portion of the electrode connecting member 4/7 extending out of the housing 3, and is different from the electrode connecting member of a flat plate structure in that the middle portion of the through slot 13/14 on the electrode connecting member is vertically bent from the bolt hole 12/15 of the electrode connecting member to form an L-shaped electrode connecting member, and other structures are not changed.

Example 7

Referring to fig. 6 to 7, this embodiment shows an overall structure of a large-capacity battery, and based on embodiment 5, battery modules are connected in series in the following manner. The positive current collecting post 43/46 and the negative current collecting post 44/47 of the single battery 41/42 are both disposed on two sides of the battery body, wherein 3 upward clip slots 31/32/33 are disposed on the positive current collecting post 43/46, and 3 corresponding downward clip slots 71/72/73 are disposed on the negative current collecting post. The size and dimension of the upward clip groove 31/32/33 are completely the same as those of the downward clip groove 71/72/73, and the shape is chiral symmetry.

When the first unit cell 41 and the second unit cell 42 are connected in series, the negative current collecting post 44 of the first unit cell 41 and the positive current collecting post 46 of the second unit cell 42 are close to each other, and the downward clip groove 71/72/73 on the negative current collecting post 44 of the first unit cell 41 and the upward clip groove 31/32/33 on the positive current collecting post 46 of the second unit cell 42 are nested together, as shown in fig. 6. And then the plug strip 45 shown in fig. 7 is inserted into the pore formed after the negative current collecting post 44 of the first unit battery 41 and the positive current collecting post 46 of the second unit battery 42 are nested, so that the unit batteries 41/42 can be connected in series, and the structure is simple, the operation is convenient, and the stability is strong.

The above is a further detailed description of the present invention, and not intended to limit the present invention to the particular preferred embodiments, and it will be understood by those skilled in the art that various changes, substitutions, and alterations can be made without departing from the spirit and scope of the present invention, and any such changes, substitutions, improvements, and equivalents as fall within the spirit and scope of the present invention as defined by the appended claims.

Claims

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 battery pack is composed of at least one battery cell, and the positive and negative electrode tabs of the battery pack are located on the same side of the battery pack 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 claimed 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 piece or a copper piece formed by one-time extrusion.

7. The overall structure of a large-capacity battery as claimed in claim 5, wherein a plug strip is provided in a gap formed after the battery modules are connected in series by 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 electrode connection member protrudes from the case through a junction between the case and the cover, and is insulatively sealed from the case and the cover by an insulating gasket.

11. The unitary structure of a large capacity battery as claimed in claim 10, wherein the electrode connection member is provided with a plurality of openings for the sealing bolts to pass through, the openings having a diameter greater than a 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. The overall structure of a large-capacity battery as claimed in claim 12, wherein a downward notch is formed at a portion of the electrode connecting member extending out of the case so that the electrode connecting member extends out of a side of the case, a flange is formed at an upper portion of the case, and a bolt hole having a diameter identical to that of the sealing bolt is formed in the flange.

14. The integrated structure of a large capacity battery as claimed in claim 13, wherein the portions of the current collecting post extending between the flange and the cap are stepped and filled with an insulating material, and an insulating plate is provided between the current collecting post and the case to prevent the current collecting post from directly contacting the case.