CN220774574U - High-capacity battery and shell thereof - Google Patents

Abstract

The utility model relates to the field of batteries, in particular to a high-capacity battery and a shell thereof. The problem that the gas path channel of the existing large-capacity battery is difficult to assemble is solved. The high-capacity battery comprises a shell and a plurality of single batteries, and the single batteries are sequentially arranged in the inner cavity of the shell in a serial or parallel mode; each single battery inner cavity comprises a gas zone; the top of the shell is provided with a gas sharing cavity; the gas sharing chamber is communicated with the gas area of the inner cavity of each single battery. According to the utility model, a plurality of single batteries are arranged in one shell with the gas sharing cavity at the top, the gas sharing cavity is not required to be spliced, the coaxial problem of a splicing piece is not required to be considered, and the requirements on processing precision and assembly precision are low; the processing difficulty and the processing cost of the high-capacity battery with the sharing system are greatly reduced, and batch production can be realized.

Description

High-capacity battery and shell thereof

Technical Field

The utility model relates to the field of batteries, in particular to a high-capacity battery and a shell thereof.

Background

Currently, in the market, single batteries in parallel or in series, such as cylindrical batteries, square-shell batteries and soft-pack batteries, are mostly used as large-capacity batteries (also called as battery modules or battery packs).

Chinese patent CN115411422a discloses a high-capacity battery, which comprises a battery cell group, as shown in fig. 1, the battery cell housing of the high-capacity battery is provided with a conduit 01 protruding out of the housing body (the conduit 01 is communicated with the inner cavity of the battery cell through a through hole formed in the battery cell housing), the collecting pipe 02 is provided with a plurality of through holes 03, and when the battery cell group is formed, the conduit 01 is connected with the collecting pipe 02 in a sealing way through the through holes 03; the conduit 01 and the collecting pipe 02 form a gas path channel of the battery cell group, and at least one end of the collecting pipe 02 is provided with a smoke outlet. When any cell in the cell group is in thermal runaway, the thermal runaway flue gas is discharged into the collecting pipe 02 through the guide pipe 01 and the through hole 03, and then the thermal runaway flue gas is discharged to a designated place for treatment through a flue gas outlet arranged on the collecting pipe 02.

In the patent, each single battery inner cavity gas area is communicated with the gas path channel, and the thermal runaway flue gas can be directly discharged from the channel, so that the safety is high. However, when the channel is assembled, the through holes on the single batteries, the guide pipes and the through holes on the corresponding collecting pipes are all coaxial, so that effective connection can be realized, and the requirements on processing and assembling precision are high.

Disclosure of Invention

The utility model aims to provide a high-capacity battery, which solves the problem that the conventional high-capacity battery gas path channel is difficult to assemble.

The technical scheme of the utility model is as follows:

the high-capacity battery is characterized in that: the battery pack comprises a shell and a plurality of single batteries, wherein the single batteries are sequentially arranged in a shell inner cavity in a serial or parallel mode; each single battery inner cavity comprises a gas zone;

the top of the shell is provided with a gas sharing cavity;

the gas sharing chamber is communicated with the gas area of the inner cavity of each single battery.

Further, a fifth through hole penetrating through the inner cavity of the single battery is formed in the top of each single battery shell;

the shell comprises a cylinder body, a first cover plate and a second cover plate;

the bottom and the top of the cylinder body are open;

the first cover plate covers the open end of the bottom of the cylinder body and is connected with the open end in a sealing way;

the second cover plate is provided with a third through hole which can enable each single battery pole to extend out; the gas sharing chamber is arranged on the second cover plate;

the second cover plate covers the open end of the top of the cylinder body and is connected with the open end in a sealing way; each single battery pole extends out of the third through hole, and the shell area corresponding to the third through hole is fixedly sealed with the single battery shell; the inner cavity of the gas sharing cavity is communicated with the gas areas of the inner cavities of the single batteries through fifth through holes.

Further, a second channel extending along the length direction of the second cover plate is arranged on the second cover plate and used as a gas sharing chamber;

or, the gas sharing chamber is a hollow pipe extending along the length direction of the second cover plate, the gas sharing chamber and the second cover plate are integrated, and a fourth through hole is formed in the pipe wall and the second cover plate.

Further, the cylinder body further comprises a plurality of partition plates arranged in the inner cavity of the cylinder body, and the inner cavity of the cylinder body is divided into a plurality of single battery mounting cavities; at least one single battery is fixed in each single battery installation cavity.

Further, the cylinder is integrally formed by adopting an extrusion process;

or the cylinder is formed by splicing at least two sub-cylinders; each sub-cylinder is integrally formed by adopting an extrusion process.

Further, a fifth through hole penetrating through the inner cavity of the single battery is formed in the top of each single battery shell;

the shell comprises a U-shaped shell, a first cover plate, a second cover plate and a third cover plate;

the first cover plate and the third cover plate are respectively covered at two opposite open ends of the U-shaped shell;

a third through hole which can enable each single battery pole to extend out is formed in the second cover plate; the gas sharing chamber is arranged on the second cover plate;

the second cover plate covers the open end of the top of the U-shaped shell and is connected with the open end in a sealing way; each single battery pole extends out of the third through hole, and the shell area corresponding to the third through hole is fixedly sealed with the single battery shell; the inner cavity of the gas sharing cavity is communicated with the gas areas of the inner cavities of the single batteries through fifth through holes.

Further, a second channel extending along the length direction of the second cover plate is arranged on the second cover plate and used as a gas sharing chamber;

or, the gas sharing chamber is a hollow pipe extending along the length direction of the second cover plate, the gas sharing chamber and the second cover plate are integrated, and a fourth through hole is formed in the pipe wall and the second cover plate.

Further, the U-shaped shell and the second cover plate are integrated.

Further, be equipped with the supporting rib between U-shaped casing bottom and each battery cell bottom, the high needs of supporting rib satisfy: after each single battery is supported by the supporting ribs, the pole of each single battery needs to be ensured to extend out of the third through hole formed in the second cover plate.

Further, the third through hole peripheral area is provided with a weak portion.

Further, the battery pack also comprises a plurality of partition plates arranged in the inner cavity of the U-shaped shell to divide the inner cavity of the U-shaped shell into a plurality of single battery mounting cavities; at least one single battery is fixed in each single battery installation cavity.

Further, the high-capacity battery further comprises a heat transfer connecting piece, wherein the heat transfer connecting piece is an elongated member, and the elongated member is used for being connected with the positive electrode or the negative electrode of each single battery; and, the elongated member is provided with a clamping portion for mounting the heat transfer tube in the axial direction.

The utility model also provides a shell for accommodating a plurality of single batteries, which is characterized in that: comprises a cylinder body, a fourth cover plate and a fifth cover plate;

the bottom and the top of the cylinder body are open;

the fourth cover plate covers the open end of the bottom of the cylinder body and is connected with the open end in a sealing way;

the fifth cover plate is provided with a gas sharing cavity communicated with the gas areas in the inner cavities of the single batteries; the fifth cover plate is provided with a third through hole which can enable each single battery pole to extend out;

the fifth cover plate covers the open end of the top of the cylinder body and is connected with the open end in a sealing way.

Further, a second channel extending along the length direction of the fifth cover plate is arranged on the fifth cover plate and is used as a gas sharing chamber;

or, the gas sharing chamber is a hollow pipe extending along the length direction of the fifth cover plate, the gas sharing chamber and the fifth cover plate are integrated, and a fourth through hole is formed in the pipe wall of the hollow pipe and the fifth cover plate.

The utility model also provides another shell for accommodating a plurality of single batteries, which is characterized in that: comprises a U-shaped shell, a first cover plate, a second cover plate and a third cover plate;

the first cover plate and the third cover plate are respectively covered at two opposite open ends of the U-shaped shell;

the second cover plate is provided with a gas sharing cavity communicated with the gas areas in the inner cavities of the single batteries; a third through hole which can enable each single battery pole to extend out is formed in the second cover plate; the second cover plate covers the open end of the top of the U-shaped shell and is connected with the open end in a sealing way.

Further, a second channel extending along the length direction of the second cover plate is arranged on the second cover plate and used as a gas sharing chamber;

or, the gas sharing chamber is a hollow pipe extending along the length direction of the second cover plate, the gas sharing chamber and the second cover plate are integrated, and a fourth through hole is formed in the pipe wall and the second cover plate.

Further, the U-shaped shell and the second cover plate are integrally formed by adopting an aluminum extrusion process.

The beneficial effects of the utility model are as follows:

1. according to the utility model, a plurality of single batteries are arranged in one shell with a gas sharing cavity at the top, and the gas sharing cavity is communicated with the gas areas in the inner cavities of the single batteries in the shell, so that the gas sharing of the single batteries ensures the consistency of the single batteries, and the cycle life of the large-capacity battery is improved to a certain extent;

the gas sharing chamber does not need to be spliced, the coaxial problem of the spliced piece is not needed to be considered, and the requirements on processing precision and assembly precision are low; the processing difficulty and the processing cost of the high-capacity battery with the sharing system are greatly reduced, and batch production can be realized.

2. The shell of the utility model is of a split structure and comprises a cylinder body capable of accommodating a plurality of single batteries, and a first cover plate and a second cover plate which seal the open end of the cylinder body. The shell is of a split structure, after the first cover plate is fixed at the open end of the bottom of the cylinder body, each single battery can be placed in the inner cavity of the shell from the open end of the top of the cylinder body, and then the second cover plate is fixed at the open end of the top of the cylinder body; in addition, the easy leakage point of the whole shell is only positioned at the connection part of the cover plate and the cylinder body, and the whole shell can be a better closed system by selecting a reliable connection means, so that the electrolyte inside each single battery is ensured not to be influenced by external environment.

3. The shell of the utility model can also be formed by a U-shaped shell and a cover plate covering three open ends of the U-shaped shell, and the U-shaped shell and the top cover plate can be integrally formed by adopting an aluminum extrusion process; the gas sharing chamber can also be integrally extruded; the processing is convenient, and the processing cost is low. Meanwhile, the number of easy leakage points is small, so that the whole shell is a better closed system, and the electrolyte inside each single battery is ensured not to be influenced by external environment.

4. According to the utility model, the inner cavity is divided into the plurality of single battery mounting cavities by additionally arranging the partition plates, and when each single battery is fixed in the corresponding single battery mounting cavity, the side wall is in direct contact with the partition plates, so that the mounting stability of each single battery in the shell can be improved on the first aspect; in the second aspect, the problem of degradation of the cycle performance of the large-capacity battery due to swelling of the individual unit batteries can be prevented; in the third aspect, heat generated in the charge and discharge processes of each single battery can be transmitted to the outside through the separator, so that the risk of thermal runaway is reduced; the fourth aspect may also enhance the strength of the barrel.

Drawings

FIG. 1 is a schematic diagram of a high-capacity battery in the background art;

fig. 2 is a schematic view of the structure of a large-capacity battery according to embodiment 1;

fig. 3 is an exploded view of the large-capacity battery of example 1;

FIG. 4 is a schematic diagram of a commercially available battery case in example 1;

FIG. 5 is a schematic view of the explosion structure of the casing in example 1;

FIG. 6 is a schematic structural view of the second cover plate in embodiment 1;

fig. 7 is a schematic view of another structure of the second cover plate in embodiment 1;

fig. 8 is a third structural schematic diagram of the second cover plate in embodiment 1;

FIG. 9 is a schematic view showing the structure of a heat transfer connection member in example 1;

fig. 10 is a schematic view of the structure of a large-capacity battery after the heat transfer connection member is mounted in example 1;

fig. 11 is a schematic view of the structure of a large-capacity battery in embodiment 2;

fig. 12 is a schematic view of the structure of a cartridge of the high-capacity battery in example 3;

FIG. 13 is a schematic view of a first cylinder structure with a separator in accordance with embodiment 4;

FIG. 14 is a schematic view of a second cylinder structure with a separator in accordance with embodiment 4;

FIG. 15 is a cross-sectional view of a third cylinder with a separator added in example 4;

fig. 16 is a schematic view showing the configuration of the combination of the i-shaped separator and the unit cell in example 4;

the reference numerals in the drawings are: 01. a conduit; 02. a manifold; 03. a through hole;

1. a housing; 2. a single battery; 3. explosion venting parts; 4. a cylinder; 5. a first cover plate; 6. a second cover plate; 7. a fifth through hole; 8. reinforcing ribs; 9. a third through hole; 10. a gas sharing chamber; 11. a third cover plate; 12. a U-shaped housing; 13. a heat transfer connection; 15. a partition plate; 41. a first sub-square cylinder; 42. a second sub square cylinder; 17. a vertical beam; 18. a cross beam; 19. a fourth cover plate; a fifth cover plate 20;

Detailed Description

So that the manner in which the above recited objects, features and advantages of the present utility model can be understood in detail, a more particular description of the utility model, briefly summarized above, may be had by reference to the embodiments, some of which are illustrated in the appended drawings. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments of the present utility model without making any inventive effort, shall fall within the scope of the present utility model.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present utility model, but the present utility model may be practiced in other ways other than those described herein, and persons skilled in the art will readily appreciate that the present utility model is not limited to the specific embodiments disclosed below.

In the description of the present utility model, it should be noted that the azimuth or positional relationship indicated by "top, bottom" or the like in terms are based on the azimuth or positional relationship shown in the drawings, and are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific azimuth, be constructed and operated in a specific azimuth, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first, second, third, fourth, and fifth" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

The utility model provides a high-capacity battery, which comprises a shell and a plurality of parallel or serial single batteries arranged in the shell; the single battery can be a square shell battery or a plurality of commercially available parallel soft package batteries. Each single cell cavity comprises an electrolyte zone and a gas zone.

The following examples are described in detail mainly using a square-case battery as a unit cell.

The shell structure and the specific arrangement mode of each single battery in the shell can be set according to specific requirements, for example, the shell can be a square shell, and each single battery can be sequentially arranged along the length direction of the shell; the housing may also be a cylindrical hollow shell, and each of the unit cells may be circumferentially arranged within the housing along the cylindrical hollow shell. However, compared with a square shell, the stability of the square shell battery in the cylindrical hollow shell is difficult to ensure, and in addition, the energy density of the energy storage device formed by the large-capacity battery is general, but the large-capacity battery with the structure has better heat radiation performance.

The top of the shell is provided with a gas sharing cavity;

the gas sharing chamber is directly communicated with the gas area of the inner cavity of each single battery.

The shell of the utility model can adopt the following structural forms, taking square shell as an example:

1. the shell is of a split structure and comprises a cylinder with an open top and a cover plate provided with a gas sharing cavity;

the cylinder structure can be formed by die casting or stamping:

after the single batteries are placed in the cylinder, the top open end of the cylinder is sealed through the cover plate (each single battery pole needs to extend out of the cover plate, and a gas sharing cavity on the cover plate is communicated with a gas area in each single battery cavity).

2. The shell is of a split structure and comprises a cylinder body, a fourth cover plate and a fifth cover plate, wherein the top and the bottom of the cylinder body are both open;

such a barrel structure can be formed by aluminum extrusion:

firstly, forming a cylinder body with an opening top and an opening bottom in an aluminum extrusion mode, then processing a fifth cover plate with a gas sharing cavity, and integrally forming the fifth cover plate and the gas sharing cavity in an aluminum extrusion mode or a stamping mode; the gas sharing chamber and the fifth cover plate can also be of a split structure, but are relatively complex to process compared with an aluminum extrusion integrated forming mode.

The four square plates can be welded to form the cylinder with the top and the bottom both open, but the overall strength and the tightness of the cylinder are relatively poor due to more welding seams.

During assembly, the fourth cover plate is fixed at the open end of the bottom of the cylinder, then the single batteries are placed in the cylinder, and finally the open end of the top of the cylinder is sealed through the fifth cover plate (all the single battery poles need to extend out of the fifth cover plate, and a gas sharing chamber on the fifth cover plate is communicated with a gas zone in the inner cavity of each single battery).

3. The shell is of a split structure and comprises a U-shaped shell, a first cover plate, a second cover plate and a third cover plate; by a U-shaped housing is meant a housing having a U-shaped cross section, i.e. a housing with three continuous open ends, it is to be noted that, because of the preferred square shape of the housing according to the utility model, the bottom of the U-shaped housing should be planar here.

The second cover plate is provided with a gas sharing chamber; the gas sharing chamber is communicated with the gas area of the inner cavity of each single battery. It should be noted that, the second cover plate and the U-shaped shell of the utility model can be arranged separately or as an integral structure;

if the structure is a split structure, a bending or stamping mode can be adopted to integrally form the U-shaped shell, and a bending or aluminum extrusion process is adopted to form a second cover plate with a gas sharing cavity; during the equipment, place U-shaped casing inner chamber with each battery cell in, fix the second apron at U-shaped casing top open end (need make each battery cell utmost point post stretch out the second apron, the gaseous district intercommunication of gaseous sharing cavity and each battery cell inner chamber on the second apron), sealed two relative open ends through first apron and third apron at last.

If the structure is an integrated structure, the second cover plate and the U-shaped shell can be integrally formed in an aluminum extrusion mode, and the gas sharing chamber can be integrally formed at the same time;

during the equipment, from two relative open ends of U-shaped casing, place each battery cell in the casing inner chamber (need make each battery cell utmost point post stretch out the second apron, the gaseous district intercommunication of gaseous sharing cavity and each battery cell inner chamber on the second apron), sealed relative two open ends through first apron and third apron at last.

The utility model is further described below with reference to the accompanying drawings and specific embodiments.

The following embodiments mainly take the cases of the second and third structural forms as examples for the detailed description.

Example 1

As shown in fig. 2 and 3, the large-capacity battery of the present embodiment includes 9 parallel single batteries 2, and the number of the other embodiments can be adjusted according to actual requirements. Referring to fig. 4, the unit cell 2 is a square-shell cell, and the square-shell cell includes an upper cover plate, a lower cover plate, a cylinder and a cell assembly; the cell assembly may also be referred to herein as an electrode assembly, which is assembled by sequentially arranging a positive electrode, a separator, and a negative electrode, using a lamination or winding process. The upper cover plate, the cylinder body and the lower cover plate form a single battery 2 shell, and the battery cell assembly is arranged in the single battery 2 shell.

Referring to fig. 5, the housing 1 of the present embodiment is a square housing, and includes a cylindrical body 4 having open ends at the top and bottom and having a square cross section, a fourth cover plate 19 covering the open end at the bottom of the cylindrical body 4, and a fifth cover plate 20 covering the open end at the top. The fifth cover plate 20 is provided with a gas sharing chamber 10.

The fifth cover plate 20 of the present embodiment is a flat plate, on which third through holes 9 (see fig. 5) are formed to enable the poles of the individual battery cells 2 to protrude; the fifth cover plate 20 covers the top open end of the cylinder 4 and is connected with the open end in a sealing way; after the poles of the single batteries 2 extend out of the third through holes 9, the shell area corresponding to the third through holes 9 is fixedly sealed with the single battery 2 shell.

The edge of the third through hole 9 can be welded with the single battery shell in the peripheral area of the pole to realize sealing;

if the dimensions of each unit cell 2 along the z direction are not completely equal, the case of the unit cell 2 with smaller dimensions in the z direction and the large-capacity battery case may have a problem of cold welding or even welding failure, and it is difficult to ensure the tightness between the third through hole 9 and the unit cell case.

In order to overcome such a problem, a weak portion may be provided at the peripheral region of the third through-hole 9, and during welding, the dimensional difference of each unit cell in the z direction is compensated for by deformation of the weak portion such that the poles of all unit cells 2 protrude out of the third through-hole 9. The weak portion in this embodiment may be an annular groove formed along the peripheral area of the third through hole 9 with the center of the third through hole 9 as a center point. In other embodiments, the weak portion may be an elongated groove formed in a peripheral region of the third through hole 9. In other embodiments, if there is a similar problem, that is, all the poles of the unit cells 2 cannot extend out of the third through hole 9 completely at the same time, the weak portion may be added to the peripheral area of the third through hole 9.

A sealing connection piece can be additionally arranged between the third through hole 9 and the pole, and the sealing connection piece comprises a hollow component; the bottom of the hollow member is used for being in sealing connection with the first area of the single battery, and the top of the hollow member is in sealing connection with the second area of the shell; the first area is an area positioned at the periphery of any pole in the upper cover plate of any single battery; the second area is an area corresponding to any one of the third through holes on the shell. The area corresponding to the third through holes is a peripheral area corresponding to any one of the third through holes on the outer surface of the shell; or the area corresponding to the third through hole is the wall of the third through hole. The area around the pole is the area around the insulating sealing pad on the pole. The insulating sealing gasket is a part used for insulating between the pole and the upper cover plate on the single battery.

The shape of the fifth cover plate 20 is matched with the shape of the open end at the top of the cylinder 4, in this embodiment, the square cylinder 4 is adopted, so that the area of the square plate can be slightly larger than the area of the open end at the top of the cylinder 4, and the square plate is fixed at the open end at the top of the cylinder 4 in a fusion welding manner; the area can be slightly smaller than the area of the open end of the top of the cylinder 4, and the area can be fixed at the open end of the top of the cylinder 4 in a caulking manner.

As shown in fig. 6, in this embodiment, a second channel extending along the length direction (x direction) of the fifth cover plate 20 is formed on the fifth cover plate 20 as the gas sharing chamber 10, and may be formed in one step by using a stamping process; as shown in fig. 7, in the width direction (y direction) of the fifth cover plate 20, the flat plate is bent to form a second channel extending in the x direction, and the structure of the entire fifth cover plate 20 can be understood as a cover plate having a cross section of a "several" shape. The second channels in fig. 6 and 7 are each convex in a direction away from the bottom of the barrel 4.

The gas sharing chamber 10 of this embodiment may also be tubular, and be formed as an integral piece with the fifth cover plate 20, and may also be formed by an aluminum extrusion process as with the cylinder 4. The cross section of the gas sharing chamber 10 may be square or circular, as shown in fig. 5 and 8.

It should be noted that, in the operation process, if the opposite ends of the gas sharing chamber 10 are open ends, the two open ends need to be plugged, so as to avoid the influence of the external environment on the electrolyte in the inner cavity of each single battery.

A fifth through hole 7 penetrating through the inner cavity of the single battery 2 is formed at the top of the casing of each single battery 2 (see fig. 3, where the fifth through hole 7 and the explosion venting portion 3 are located at different positions on the top of the single battery 2, it should be noted that the fifth through hole 7 may be a through hole formed by directly opening the explosion venting portion 3).

When the tubular gas sharing chamber 10 is selected, a fourth through hole penetrating the fifth through hole 7 needs to be formed in the fifth cover plate 20 and the gas sharing chamber 10, and the gas sharing chamber 10 is communicated with the gas areas of the inner cavities of the respective unit cells 2 through the fourth through hole and the fifth through hole 7. It should be noted that the number of the fourth through holes may be plural, and the number of the fourth through holes is equal to that of the individual unit cells 2, and each fourth through hole corresponds to and penetrates through the fifth through hole 7 one by one; it is also possible to directly provide a fourth through hole in a long shape extending along the length direction of the gas sharing chamber 10 in the fifth cover plate 20 and the gas sharing chamber 10, and the size of the fourth through hole needs to be ensured, so that the fourth through hole is communicated with the fifth through holes 7 of all the unit batteries 2 when the fifth cover plate 20 is fixed at the top open end of the cylinder 4.

If the gas sharing chamber 10 is in the shape of a second channel, i.e. the structure shown in fig. 6 and 7, when the fifth cover plate 20 is fixed at the top open end of the cylinder 4, the inner cavity of the second channel is directly communicated with the gas area in the inner cavity of each single battery 2 through the fifth through hole 7.

An exhaust valve and a rupture disk may be provided on the gas sharing chamber 10, or only the exhaust valve may be provided; the exhaust valve can be opened manually or automatically, the exhaust valve is opened periodically, and the gas in the gas area in each single battery 2 can be discharged after passing through the gas sharing chamber 10 and the exhaust valve; when the explosion venting membrane is arranged, the vent valve and the explosion venting membrane are positioned at two ends of the gas sharing chamber 10, and the explosion venting membrane is used for enabling the explosion venting membrane to be broken by thermal runaway smoke to be discharged out of the hollow member when thermal runaway occurs in any single battery 2, so that the high-capacity battery has higher safety performance.

Can be prepared by the following process:

step one, processing the shell 1, comprising a cylinder 4, a fifth cover plate 20 with a gas sharing chamber 10, and a fourth cover plate 19.

And step two, sealing and welding a fourth cover plate 19 on the bottom open end of the cylinder 4.

Step three, capacity-dividing sorting is carried out, and a plurality of single batteries meeting the requirements are screened; a fifth through hole 7 is formed in the top of each single battery, and then the single batteries are sealed by a sealing assembly; arranging the single batteries with the sealing components at the positions of the fifth through holes 7 in the cylinder body 4; the fifth cover plate 20 is welded on the open end of the top of the cylinder 4 in a sealing way, so that after the sealing assembly is opened by external force or electrolyte, the gas areas in the inner cavities of all the single batteries 2 are communicated with the inner cavities of the gas sharing chambers 10; the sealing component can adopt the sealing component disclosed in China patent CN218525645U, CN218525614U, and the third through hole 9 and the peripheral part of the pole of the single battery shell are welded to realize sealing. The third through hole 9 and the shell of the single battery 2 can be sealed firstly, and then the fifth cover plate 20 is welded at the open end of the top of the cylinder 4 in a sealing way; in other embodiments, the fifth cover 20 and the open top end of the barrel 4 and the fourth cover 19 and the open bottom end of the barrel 4 may be fixed by bonding or screw connection, but the sealing performance or connection reliability is relatively weak compared with the welding mode.

And step four, opening the sealing assembly by using external force or electrolyte, wherein the inner cavity of the gas sharing chamber 10 is communicated with the gas areas of the inner cavities of the single batteries 2.

All the unit cells 2 are then connected in parallel or in series. In other embodiments, each cell 2 may be connected in parallel or in series between step three and step four.

Specifically, all the unit cells 2 may be connected in parallel by using the heat transfer connection member 13 shown in fig. 9 and 10, and the heat transfer connection member 13 is an elongated member for connecting with the positive or negative electrode of each unit cell 2; and, the elongated member is provided with a clamping portion for mounting the heat transfer tube in the axial direction. The positive electrodes or the negative electrodes of the plurality of single batteries 2 are connected through the heat transfer connecting piece 13, and the heat transfer pipe is clamped on the heat transfer connecting piece 13, so that the local temperature of the pole on each single battery 2 can be controlled, and the occurrence of thermal runaway phenomenon caused by overhigh temperature of the pole is reduced.

Example 2

As shown in fig. 11, unlike embodiment 1, the present embodiment case 1 includes a U-shaped housing 12, and first, second, and third cover plates 5, 6, 11; wherein the U-shaped housing 12 is provided separately from the second cover plate 6.

The second cover plate 6 is provided with a gas sharing chamber 10 extending in the x direction, and the structure thereof is the same as that of embodiment 1.

Can be prepared by the following process:

step one, machining the U-shaped shell 12, the first cover plate 5, the second cover plate 6 and the third cover plate 11.

Step two, capacity-sorting, namely screening a plurality of single batteries meeting the requirements; a fifth through hole 7 is formed in the top of each single battery, and then the single batteries are sealed by a sealing assembly; arranging the single batteries with the sealing assemblies at the positions of the fifth through holes 7 in the U-shaped shell 12 in the first step, sealing and welding the second cover plate 6 at the open end of the top of the U-shaped shell 12, and ensuring that after the sealing assemblies are opened by external force or electrolyte, the gas areas of the inner cavities of the single batteries are communicated with the gas sharing cavity 10; the sealing assembly can adopt the sealing assembly disclosed in Chinese patent CN218525645U, CN218525614U, the edge area of the third through hole 9 is welded with the shell of the peripheral area of the pole, and the first cover plate 5 and the third cover plate 11 are welded at the other two opposite open ends of the U-shaped shell 12, so that the sealing is realized. It should be noted here that if the gas sharing chamber 10 is open at both ends in the yz plane, it is necessary to seal both open ends of the gas sharing chamber 10 in the yz plane with the first cover plate 5 and the third cover plate 11 at the same time. The first cover plate 5, the second cover plate 6 and the third cover plate 11 may be fixed to the open end of the U-shaped housing 12 by screw fastening or gluing, but the sealing or connection reliability is relatively weak with respect to the welding.

And thirdly, opening the sealing assembly by using external force or electrolyte, wherein the inner cavity of the gas sharing chamber 10 is communicated with the gas areas of the inner cavities of the single batteries.

All the cells 2 are then connected in parallel or in series, which can also be performed between step two and step three in other embodiments.

Example 3

Unlike embodiment 2, the U-shaped housing 12 of this embodiment is formed as a single piece with the second cover plate 6, and the structure of the single piece is shown in fig. 12.

It will be appreciated that the housing 1 of the present embodiment comprises a barrel as shown in fig. 12, and a first cover plate 5 and a third cover plate 11 for covering opposite open ends of the barrel; the first cover plate 5 and the third cover plate 11 lie in the yz plane (see fig. 11).

The barrel body of the embodiment can be integrally formed by adopting an aluminum extrusion process; because the cylinder extends along the x direction, the open end of the cylinder is positioned on the yz plane, and the extrusion direction is carried out along the x direction, the cylinder meeting the target length can be extruded and formed at one time.

For integral extrusion with the cylinder, the gas sharing chamber 10 of this embodiment preferably adopts the following two structural forms:

1. a pipe section with a square or circular section is formed on the outer surface of the top of the second cover plate 6 to serve as a gas sharing chamber 10, and then a through pipe inner cavity is formed on the pipe wall and the second cover plate 6, and a fourth through hole corresponding to the fifth through hole 7 is formed;

2. forming a second channel extending in the x direction in the second cover plate 6; wherein the second channel protrudes away from the bottom of the U-shaped housing 12.

The large-capacity battery of this embodiment can be prepared by the following procedure:

step one, processing the cylinder, the first cover plate 5 and the third cover plate 11 shown in fig. 12.

Step two, capacity-sorting, namely screening a plurality of single batteries meeting the requirements; a fifth through hole 7 is formed in the top of the single battery shell and then is sealed by a sealing assembly; arranging a plurality of single batteries with sealing assemblies in the cylinder body in the first step, so that a fifth through hole 7 with the sealing assemblies corresponds to a fourth through hole or a second through hole, and ensuring that after the sealing assemblies are opened by external force or electrolyte, the gas areas of the inner cavities of the single batteries 2 are communicated with the inner cavities of the gas sharing chambers 10; the sealing assembly may be the one disclosed in chinese patent CN218525645U, CN 218525614U. The poles of the single batteries 2 extend out of the corresponding third through holes 9 on the second cover plate 6, and the peripheral areas of the third through holes 9 and the shell parts of the peripheral areas of the poles are welded to realize sealing; it should be noted that, in order for each unit cell 2 to be smoothly arranged in the cylinder shown in fig. 12, the minimum dimension of the cylinder along the z direction needs to be larger than the dimension of the unit cell 2 along the z direction, and in order to ensure that the pole of each unit cell 2 can extend out of the third through hole 9 at the top of the cylinder, a supporting rib needs to be additionally arranged at the bottom of each unit cell 2;

a plurality of unit cells with sealing assemblies can be arranged in the cylinder body of the first step in three ways:

1) Selecting long equal-height supporting ribs;

fixing a plurality of single batteries 2 into a whole, and pushing the single batteries into the inner cavity of the cylinder from any open end of the cylinder; at this time, the bottom of each unit cell 2 is in contact with the bottom of the cylinder, and the pole of each unit cell 2 corresponds to the corresponding third through hole 9, but does not extend out of the third through hole 9; then, supporting a plurality of single batteries 2 from the bottom by utilizing a tool, enabling the bottom of each single battery 2 to be separated from the bottom of the cylinder, and enabling the pole post of each single battery 2 to extend out of the corresponding third through hole 9; and then, inserting a strip-shaped equal-height supporting rib along the x direction, and taking out the tool.

In addition, if the dimensions of the individual unit cells 2 along the z direction are not completely equal, at this time, even if the long-shaped equal-height supporting ribs are added, the corresponding third through holes 9 may not be fully extended from the poles of the unit cells 2 with smaller dimensions in the z direction, so that in order to overcome such problems, weak portions may be provided in the peripheral regions of the third through holes 9, and during the welding process, the dimensional differences of the individual unit cells along the z direction are compensated by the deformation of the weak portions, so that the poles of all the unit cells 2 extend out of the third through holes 9. The weak portion in this embodiment may be an annular groove formed along the peripheral area of the third through hole 9 with the center of the third through hole 9 as a center point. In other embodiments, the weak portion may be an elongated groove formed in a peripheral region of the third through hole 9.

2) Selecting a plurality of supporting ribs which are in one-to-one correspondence with the single batteries 2;

the plurality of single batteries 2 are sequentially pushed into the inner cavity of the cylinder from any open end of the cylinder, and after each single battery 2 is pushed into place, a supporting rib is required to be inserted between the bottom of the single battery and the bottom of the cylinder, so that the pole of the single battery 2 is ensured to completely extend out of the corresponding third through hole 9.

3) Each single battery 2 is reversely pushed into the inner cavity of the cylinder;

the cylinder body is turned over, the top of the cylinder body is downward, a plurality of single batteries 2 are fixed into a whole, and the single batteries are pushed into the inner cavity of the cylinder body from any open end of the cylinder body; or sequentially pushing a plurality of single batteries 2 into the inner cavity of the cylinder from any open end of the cylinder; under the action of gravity, the pole of each single battery 2 extends out of the corresponding third through hole 9, and a supporting rib is inserted between the bottom of each single battery 2 and the bottom of the cylinder; the cylinder is turned over to make the top of the cylinder upward.

And thirdly, welding the first cover plate 5 and the third cover plate 11 on the other two opposite open ends of the U-shaped shell 12.

And fourthly, opening the sealing assembly by using external force or electrolyte, wherein the inner cavity of the gas sharing cavity is communicated with the gas area of the inner cavity of each single battery.

Example 4

In the present embodiment, the inner cavity of the housing 1 in the above embodiment is provided with a plurality of partition plates 15, which divide the inner cavity into a plurality of mounting cavities for the unit batteries 2.

As shown in fig. 13 to 15, a single battery 2 is fixed in the installation cavity of each single battery 2, the side walls of the two sides of each single battery 2 close to the middle part are contacted with a baffle 15, and the side walls of the two single batteries 2 close to the outermost side are contacted with the baffle 15, and the other side wall is contacted with the side wall of the cylinder body, so that the installation stability of each single battery 2 in the shell can be improved on the first aspect; in the second aspect, the problem of degradation of the cycle performance of the large-capacity battery due to swelling of the individual unit cells 2 can be prevented; in the third aspect, heat generated during the charge and discharge of each unit cell 2 can be transmitted to the outside through the separator 15, reducing the risk of occurrence of thermal runaway; the fourth aspect may also enhance the strength of the barrel.

Two or more single batteries 2 can be fixed in each single battery 2 installation cavity.

Fig. 13 shows that the partition 15 is added in the cylinder 4 of embodiment 1, and the partition 15 and the cylinder 4 can be integrally formed by extrusion, and when the length of the cylinder 4 along the x direction is long and is difficult to be completed by one extrusion, two or more sub-square cylinders 4 can be extruded first, and then the sub-square cylinders 4 are spliced and welded to form a square cylinder 4 with a required size. For the large-capacity battery in embodiment 1, two sub square cylinders capable of accommodating five unit batteries 2 may be extruded, wherein one more unit battery 2 installation cavity may be used as a function cabin. As shown in fig. 13, sub-square cylinders that can accommodate 4 and 5 unit batteries 2 may be respectively extruded, and two sub-square cylinders may be respectively defined as a first sub-square cylinder 41 and a second sub-square cylinder 42.

In order to ensure the bearing of the housing 1, a plurality of reinforcing ribs 8 extending along the height direction and arranged along the length direction can be arranged on the side wall of the cylinder 4, and as can be seen from the figure, each reinforcing rib 8 is positioned at the middle position of the side wall of the installation cavity of the single battery 2.

Fig. 14 and 15 show the addition of a partition 15 to the U-shaped housing 12 of example 2 and example 3, respectively. The separator 15 may also be an i-shaped separator as shown in fig. 16, in which a vertical beam 17 of the i-shaped separator is parallel to the first cover plate 5 and the third cover plate 11 and contacts with a side wall of the two unit cells 2 adjacent to the yz plane, and one beam 18 of the i-shaped separator contacts with a side wall of the two unit cells 2 in the xz plane, and the other beam 18 of the i-shaped separator contacts with the other side wall of the two unit cells 2 in the xz plane. The stability of each single battery 2 in the single battery 2 installation cavity can be improved by additionally arranging the I-shaped partition plates.

Claims (17)

1. A high capacity battery characterized by: the battery pack comprises a shell (1) and a plurality of single batteries (2), wherein the single batteries (2) are sequentially arranged in the inner cavity of the shell (1) in a serial or parallel mode along the length direction of the shell; each single battery (2) inner cavity comprises a gas zone;

the top of the shell (1) is provided with a gas sharing chamber (10) extending along the length direction of the shell;

the gas sharing chamber (10) is communicated with a gas area of the inner cavity of each single battery (2).

2. The high-capacity battery according to claim 1, wherein: a fifth through hole (7) penetrating through the inner cavity of each single battery (2) is formed in the top of the shell of each single battery (2);

the shell (1) comprises a cylinder (4), a fourth cover plate (19) and a fifth cover plate (20);

the bottom and the top of the cylinder body (4) are open;

the fourth cover plate (19) covers the bottom open end of the cylinder (4) and is connected with the open end in a sealing way;

the fifth cover plate (20) is provided with a third through hole (9) which can enable the pole of each single battery (2) to extend out; the gas sharing chamber (10) is arranged on a fifth cover plate (20);

the fifth cover plate (20) covers the top open end of the cylinder (4) and is connected with the open end in a sealing way; the poles of the single batteries (2) extend out of the third through holes (9), and the shell area corresponding to the third through holes (9) is fixedly sealed with the shell of the single battery (2); the inner cavity of the gas sharing chamber (10) is communicated with the gas area of the inner cavity of each single battery (2) through a fifth through hole (7).

3. The high-capacity battery according to claim 2, wherein: the fifth cover plate (20) is provided with a second channel extending along the length direction of the fifth cover plate (20) as a gas sharing chamber (10);

or, the gas sharing chamber (10) is a hollow pipe extending along the length direction of the fifth cover plate (20), the hollow pipe and the fifth cover plate (20) are integrated, and a fourth through hole is formed in the pipe wall and the fifth cover plate (20).

4. A high-capacity battery as claimed in claim 3, wherein: the cylinder body (4) further comprises a plurality of partition plates (15) arranged in the inner cavity of the cylinder body (4), and the inner cavity of the cylinder body (4) is divided into a plurality of single battery (2) installation cavities; at least one single battery (2) is fixed in the installation cavity of each single battery (2).

5. The large-capacity battery according to any one of claims 2 to 4, wherein: the cylinder body (4) is integrally formed by adopting an extrusion process;

or, the cylinder body (4) is formed by splicing at least two sub-cylinder bodies (4); each sub-cylinder (4) is integrally formed by adopting an extrusion process.

6. The high-capacity battery according to claim 1, wherein: a fifth through hole (7) penetrating through the inner cavity of each single battery (2) is formed in the top of the shell of each single battery (2);

the shell (1) comprises a U-shaped shell (12), a first cover plate (5), a second cover plate (6) and a third cover plate (11);

the first cover plate (5) and the third cover plate (11) are respectively covered at two opposite open ends of the U-shaped shell (12);

a third through hole (9) which can enable the pole of each single battery (2) to extend out is formed in the second cover plate (6); the gas sharing chamber (10) is arranged on the second cover plate (6);

the second cover plate (6) covers the top open end of the U-shaped shell (12) and is connected with the open end in a sealing way; the poles of the single batteries (2) extend out of the third through holes (9), and the shell area corresponding to the third through holes (9) is fixedly sealed with the shell of the single battery (2); the inner cavity of the gas sharing chamber (10) is communicated with the gas area of the inner cavity of each single battery (2) through a fifth through hole (7).

7. The high-capacity battery as claimed in claim 6, wherein: a second channel extending along the length direction of the second cover plate (6) is arranged on the second cover plate (6) and is used as a gas sharing chamber (10);

or, the gas sharing chamber (10) is a hollow pipe extending along the length direction of the second cover plate (6), the hollow pipe and the second cover plate (6) are integrated, and a fourth through hole is formed in the pipe wall and the second cover plate (6).

8. The high-capacity battery as claimed in claim 6, wherein: the U-shaped shell (12) and the second cover plate (6) are integrated.

9. The high-capacity battery according to claim 8, wherein: be equipped with the supporting rib between U-shaped casing bottom and each battery cell (2) bottom, the high needs of supporting rib satisfy: after each single battery (2) is supported by the supporting ribs, the pole of each single battery (2) needs to be ensured to extend out of a third through hole (9) formed in the second cover plate (6).

10. The high-capacity battery according to claim 9, wherein: and a weak part is arranged in the peripheral area of the third through hole (9).

11. The large-capacity battery according to claim 6 or 8, characterized in that: the battery pack also comprises a plurality of partition boards (15) arranged in the inner cavity of the U-shaped shell (12), and the inner cavity of the U-shaped shell (12) is divided into a plurality of single battery (2) installation cavities; at least one single battery (2) is fixed in the installation cavity of each single battery (2).

12. The high-capacity battery according to claim 1, wherein: the heat transfer device further comprises a heat transfer connecting piece (13), wherein the heat transfer connecting piece (13) is an elongated member which is used for being connected with the positive electrode or the negative electrode of each single battery (2); and, the elongated member is provided with a clamping portion for mounting the heat transfer tube in the axial direction.

13. A casing for accommodating a plurality of single cells (2), characterized in that: comprises a cylinder body (4), a fourth cover plate (19) and a fifth cover plate (20);

the bottom and the top of the cylinder body (4) are open;

the fourth cover plate (19) covers the bottom open end of the cylinder (4) and is connected with the open end in a sealing way;

the fifth cover plate (20) is provided with a gas sharing chamber (10) communicated with the gas areas in the inner cavities of the single batteries; the fifth cover plate (20) is provided with a third through hole (9) which can enable the pole of each single battery (2) to extend out;

the fifth cover plate (20) covers the open end of the top of the cylinder body (4) and is connected with the open end in a sealing way.

14. The housing of claim 13, wherein: the fifth cover plate (20) is provided with a second channel extending along the length direction of the fifth cover plate (20) as a gas sharing chamber (10);

or, the gas sharing chamber (10) is a hollow pipe extending along the length direction of the fifth cover plate (20), the hollow pipe and the fifth cover plate (20) are integrated, and a fourth through hole is formed in the pipe wall of the hollow pipe and the fifth cover plate (20).

15. A casing for accommodating a plurality of single cells (2), characterized in that: comprises a U-shaped shell (12), a first cover plate (5), a second cover plate (6) and a third cover plate (11);

the first cover plate (5) and the third cover plate (11) are respectively covered at two opposite open ends of the U-shaped shell (12);

the second cover plate (6) is provided with a gas sharing cavity (10) communicated with the gas areas in the inner cavities of the single batteries; a third through hole (9) which can enable the pole of each single battery (2) to extend out is formed in the second cover plate (6); the second cover plate (6) covers the top open end of the U-shaped shell (12) and is connected with the open end in a sealing way.

16. The housing of claim 15, wherein: a second channel extending along the length direction of the second cover plate (6) is arranged on the second cover plate (6) and is used as a gas sharing chamber (10);

or, the gas sharing chamber (10) is a hollow pipe extending along the length direction of the second cover plate (6), the hollow pipe and the second cover plate (6) are integrated, and a fourth through hole is formed in the pipe wall of the hollow pipe and the second cover plate (6).

17. The housing according to claim 15 or 16, wherein: the U-shaped shell (12) and the second cover plate (6) are integrally formed by adopting an aluminum extrusion process.