CN117977079A - High-capacity battery and shell - Google Patents

Abstract

The invention relates to the field of batteries, in particular to a high-capacity battery and a shell. The problem that the existing high-capacity battery sharing pipeline assembly is difficult to assemble is solved. The high-capacity battery comprises a shell and a plurality of single batteries, wherein the single batteries are sequentially connected in parallel and are arranged in the inner cavity of the shell; each single battery cavity comprises an electrolyte area and a gas area; the bottom of the shell is provided with an electrolyte sharing chamber; the electrolyte sharing chamber is communicated with the electrolyte areas in the inner cavities of the single batteries. According to the invention, a plurality of single batteries are arranged in one shell with an electrolyte sharing cavity at the bottom, the electrolyte sharing cavity does not need to be spliced, the problem of splicing coaxiality is not needed to be considered in the arrangement direction of the single batteries, and the requirements on processing precision and assembly precision are low; meanwhile, a special tool is not needed, the assembly process is simpler, the processing difficulty and the processing cost of the high-capacity battery with the shared system are greatly reduced, and batch production can be realized.

Description

High-capacity battery and shell

Technical Field

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

Background

In the market, a plurality of single batteries are connected in parallel or in series to form a large-capacity battery (also called a battery module or a battery pack).

The structure of the existing high-capacity battery is shown in fig. 1, and the structure of the existing high-capacity battery comprises a battery pack main body formed by connecting a plurality of single batteries in parallel and a shared pipeline assembly positioned at the bottom of the battery pack main body; and the shared pipeline component is used for completely penetrating the inner cavities of the plurality of single batteries so that all the single batteries in the battery pack are in an electrolyte system. The uniformity of each single battery electrolyte in the battery pack can be enhanced through the shared pipeline assembly, the cycle life is prolonged, the service life of the battery pack can be prolonged, and the use safety of the battery pack is improved.

However, the shared pipeline assembly is formed by directly performing sealing and splicing on the multi-section sub pipeline 01 and the intermediate connecting pipe 02 in interference fit; at this time, the multi-section sub-pipelines 01 are arranged on the lower cover plate 03 of the single battery one by one, extend along the arrangement direction of the single battery 1, are integrally extruded with the lower cover plate 03, and are communicated with the openings of the lower cover plate 03.

During assembly, two ends of the sub-pipeline 01 are used as connecting ends of the middle connecting pipe 02, and when two single batteries are connected, one ends of the sub-pipelines on the two single batteries are respectively extruded into the two ends of the middle connecting pipe 02.

The shared pipeline assembly requires the coaxiality of each sub pipeline 01 and the intermediate connecting pipe 02 in the plugging process to realize effective connection, but the coaxiality of each sub pipeline and the intermediate connecting pipe 02 is difficult to ensure due to the following reasons:

1) The sub-pipelines and the lower cover plate are integrated, if the positions of the sub-pipelines on the lower cover plate are slightly deviated on each integrated part, or the sizes of the sub-pipelines are slightly deviated, the coaxiality of the sub-pipelines is deviated when the sub-pipelines are spliced;

2) When the integrated piece is welded with the cylinder, the situation that the positions of the sub pipelines relative to the cylinder are inconsistent can possibly occur due to the difference of welding processes, and therefore, the coaxiality of each sub pipeline is deviated when the sub pipelines are spliced;

3) According to the scheme, when the plug-in type pipeline is plugged, a special tool is needed, and due to improper use of the tool or a slight carelessness of constructors, the coaxiality of each sub pipeline is deviated;

in addition, when in plugging, the deviation among the sub-pipelines can be increased along with the increase of the plugging quantity, so that the coaxiality among the sub-pipelines is more difficult to ensure as the plugging quantity is increased; resulting in a decrease in yield with an increase in the number of pins during assembly.

In summary, in this scheme, because the sub-pipelines of two adjacent single batteries are difficult to be coaxial, when grafting, the sub-pipeline may be caused to displace relative to the lower cover plate, or the lower cover plate may be caused to displace relative to the cylinder, and further the battery is damaged.

Disclosure of Invention

The invention aims to provide a high-capacity battery, which solves the problem that the existing high-capacity battery sharing pipeline assembly is difficult to assemble.

The technical scheme of the invention 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 connected in parallel and are arranged in an inner cavity of the shell; each single battery cavity comprises an electrolyte area and a gas area;

the bottom of the shell is provided with an electrolyte sharing cavity;

The electrolyte sharing chamber is communicated with the electrolyte areas in the inner cavities of the single batteries.

Further, a third through hole which can enable each single battery pole to extend out is formed in the top of the shell; 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.

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

the electrolyte sharing chamber is arranged at the bottom of the U-shaped shell;

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 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.

Further, the bottom of the shell of each single battery is provided with a first through hole penetrating through the inner cavity of the shell;

the electrolyte sharing chamber is a first channel arranged at the bottom of the U-shaped shell;

the first channel is communicated with the first through hole.

Further, the bottom of the U-shaped shell protrudes to a direction away from the top of the U-shaped shell to form a first channel.

Further, in order to improve the heat dissipation performance of the large-capacity battery, the outer surface areas of the bottoms of the U-shaped shells positioned on the two sides of the first channel are provided with heat dissipation fins.

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

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

Further, be equipped with the second brace rod between U-shaped casing bottom and each battery cell bottom, the high needs of second brace rod satisfy: after each single battery is supported by the second 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 has a weakened portion in a peripheral region thereof.

Further, at least two first supporting ribs extending along the arrangement direction of the single batteries are arranged on the inner surface of the bottom of the U-shaped shell, and the two first supporting ribs and the bottom area of the U-shaped shell between the two first supporting ribs form a first channel.

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

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

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

Further, a separator is arranged between two adjacent single batteries.

Further, the separator is an I-shaped separator, a vertical beam of the I-shaped separator is contacted with the adjacent side wall of the two single batteries, which is positioned in the yz plane, one beam of the I-shaped separator is contacted with the side wall of the two single batteries, which is positioned in the xz plane, and the other beam of the I-shaped separator is contacted with the other side wall of the two single batteries, which is positioned in the xz plane.

Further, a gas chamber is arranged on the second cover plate;

The gas chamber covers the explosion venting parts at the top of each single battery, and when any single battery explosion venting part is broken by inner cavity smoke, the gas area of the inner cavity of the single battery is communicated with the inner cavity of the gas chamber;

Or, the top of each single battery shell is provided with a fifth through hole penetrating through the inner cavity of the single battery, the gas cavity covers the fifth through hole, and the inner cavity of the gas cavity is communicated with the gas area of the inner cavity of each single battery through the fifth through hole.

Further, the second cover plate protrudes to a direction away from the bottom of the U-shaped shell to form a second channel as a gas chamber.

In order to further reduce the manufacturing cost of the high-capacity battery and improve the sealing performance, the U-shaped shell and the second cover plate are integrated.

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

Further, be equipped with the supporting rib between U-shaped casing bottom and each battery cell bottom, the high needs of above-mentioned 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. It should be noted that, if the electrolyte sharing chamber adopts the structure form of "the bottom of the U-shaped housing is protruded to the direction away from the top of the U-shaped housing to form the first channel", the supporting rib is the second supporting rib, if the electrolyte sharing chamber adopts the structure form of "the inner surface of the bottom of the U-shaped housing is provided with at least two first supporting ribs extending along the arrangement direction of the single battery", and when the two first supporting ribs and the bottom area of the U-shaped housing located between the two first supporting ribs form the first channel ", the supporting rib is the first supporting rib.

Further, the third through hole has a weakened portion in a peripheral region thereof.

Further, a separator is provided between two adjacent unit cells.

Further, an I-shaped partition plate is adopted, a vertical beam of the I-shaped partition plate is contacted with the side wall, adjacent to the two single batteries, located in the yz plane, of the I-shaped partition plate, one beam of the I-shaped partition plate is contacted with the side wall, located in the xz plane, of the two single batteries, and the other beam of the I-shaped partition plate is contacted with the other side wall, located in the xz plane, of the two single batteries.

Further, the high-capacity battery further includes a heat transfer connection member, which is an elongated member for connection with the positive electrode or the negative electrode of each unit cell; and, the elongated member is provided with a clamping portion for mounting the heat transfer tube in the axial direction.

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

The bottom of the U-shaped shell is provided with an electrolyte sharing chamber; the electrolyte sharing chamber is used for communicating with electrolyte areas in the inner cavities of all the single batteries;

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 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 gas chamber is provided on the second cover plate.

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

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

The beneficial effects of the invention are as follows:

1. according to the invention, a plurality of single batteries are arranged in one shell with an electrolyte sharing cavity at the bottom, and the electrolyte sharing cavity is communicated with the inner cavities of the single batteries in the shell, so that the electrolyte sharing of the single batteries ensures the consistency of the single batteries, namely, the electrolyte cavities of the single batteries are communicated, the electrolytes of all the single batteries are in the same system, the difference among the electrolytes of the single batteries is reduced, the consistency among the single batteries is improved to a certain extent, and the cycle life of the large-capacity battery is improved to a certain extent.

According to the invention, the electrolyte sharing chamber does not need to be spliced, the problem of coaxial splicing is not required to be considered in the arrangement direction of the single batteries, and the requirements on the processing precision and the assembly precision are low; meanwhile, a special tool is not needed, the assembly process is simpler, the processing difficulty and the processing cost of the high-capacity battery with the shared system are greatly reduced, and batch production can be realized.

2. According to the invention, the poles of all the single batteries extend out of the top of the shell, and the heat dissipation effect of the poles is better compared with the structure that the poles are positioned in the shell; in addition, after the polar post stretches out the shell, if the battery temperature is too high, the heat of the polar post can be conveniently and timely conducted out by utilizing heat exchange equipment in the later stage, and the high-capacity battery can be ensured to operate at the optimal temperature.

3. The shell of the invention is composed of a U-shaped shell and a cover plate covering three open ends of the U-shaped shell, the U-shaped shell can be integrally processed and formed, then the open ends are sealed by the cover plate, the easy leakage point of the whole shell is only positioned at the connection part of the cover plate and the U-shaped shell, and the whole shell can be a better closed system by selecting a reliable connection means, so that the electrolyte in the high-capacity battery is ensured not to be influenced by external environment.

4. The invention is provided with a first channel at the bottom of the U-shaped shell as an electrolyte sharing chamber, and the first channel is communicated with electrolyte areas of the inner cavities of all the single batteries in the shell. Compared with a structure adopting a hollow pipe section as an electrolyte sharing chamber, the structure does not need to additionally provide a through hole, the first channel is directly communicated with the electrolyte areas of the inner cavities of all the single batteries through the first through hole, and the structure and the processing are simpler.

5. The first channel and the U-shaped shell can be integrated, if the bottom of the U-shaped shell can be protruded in the direction away from the top of the U-shaped shell by adopting a bending or aluminum extrusion process to form the first channel, the first channel can be formed by integrally forming the supporting rib, and the processing cost is low while the processing is convenient.

6. According to the invention, the bottom of the U-shaped shell is provided with the radiating fins so as to improve the radiating performance of the high-capacity battery.

7. According to the invention, the gas chambers are arranged on the second cover plate, and the gas areas of the inner cavities of all the single batteries are communicated with the gas chambers, so that all the single batteries are communicated in a gas way, and the gas balance of all the single batteries is achieved under the same environment, so that the difference among the single batteries is reduced, the consistency among the single batteries is improved, and the cycle life of the high-capacity battery is further prolonged.

The gas chamber can also directly cover the explosion venting parts at the top of each single battery, and can be used as an explosion venting pipe, when the pressure in the inner cavity of any single battery is overlarge, the explosion venting parts on each single battery are broken through by inner cavity gas or thermal runaway flue gas to enter the gas chamber, and the gas is discharged from the gas chamber; because each single battery is provided with the explosion venting part, and the explosion venting part is positioned in the gas area of each single battery, the thermal runaway flue gas breaks through the explosion venting part and enters the explosion venting pipe, the pressure holding time is shorter, and the safety is higher.

8. The U-shaped shell and the second cover plate can be integrally formed by adopting an aluminum extrusion process; in the extrusion process, the electrolyte sharing chamber can be integrally extruded at the same time; the processing is convenient, and the processing cost is low. In addition, the structure of split arrangement is relative to the U-shaped shell and the second cover plate, so that leakage points are further reduced, and the whole shell is a better closed system.

9. According to the invention, the inner cavity of the cylinder body is divided into a 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 showing the structure of a large-capacity battery with the outer case removed in example 1;

Fig. 3 is a schematic view of the structure of a large-capacity battery in embodiment 1;

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

FIG. 5 is a schematic view showing the structure of an electrolyte sharing chamber in embodiment 1;

FIG. 6 is a schematic view showing another electrolyte sharing chamber structure in embodiment 1;

FIG. 7 is a schematic view showing the structure of a third electrolyte-sharing chamber in example 1;

FIG. 8 is a schematic view of the third cover plate in embodiment 1;

fig. 9 is a schematic structural view of a large-capacity battery having a heat transfer connection member in embodiment 1;

FIG. 10 is a schematic view showing the structure of a heat transfer connection member 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 third cover plate in embodiment 2;

FIG. 13 is a schematic view of a cylinder structure in embodiment 3;

FIG. 14 is a schematic view of another barrel structure in embodiment 3;

FIG. 15 is a schematic view of the structure of the U-shaped housing of embodiment 4 with a partition plate added to the inner cavity of the U-shaped housing;

fig. 16 is a schematic view showing the structure of the i-shaped separator in example 4 in cooperation with the unit cell;

the reference numerals in the drawings are:

01. A sub-pipeline; 02. an intermediate connecting pipe; 03. a lower cover plate;

1. a single battery; 2. a U-shaped housing; 3. a first cover plate; 4. a third cover plate; 5. a second cover plate; 6. the bottom of the U-shaped shell; 7. a pipe section; 8. a first channel; 9. a fin; 10. a first support rib; 11. a liquid injection port; 12. a third through hole; 13. a second channel; 15. a weak portion; 16. a partition plate; 17. a vertical beam; 18. a cross beam; 19. a heat transfer connection.

Detailed Description

So that the manner in which the above recited objects, features and advantages of the present invention can be understood in detail, a more particular description of the invention, 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 invention without making any inventive effort, shall fall within the scope of the present invention.

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

In the description of the present invention, 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 invention 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 invention. Furthermore, the terms "first, second, third, fourth, etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

The invention provides a high-capacity battery, which comprises a shell and a plurality of parallel single batteries arranged in the shell, wherein the shell is provided with a plurality of parallel connection batteries; 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 shell structure and the specific arrangement mode of each single battery in the shell can be set according to specific requirements, for example, when the square shell battery is selected as the single battery, the shell can be a square shell, and each square shell battery can be sequentially arranged along the length direction of the shell; the shell can also be a cylindrical hollow shell, each square shell battery can be arranged along the circumferential direction of the shell, but the stability of the square shell battery in the cylindrical hollow shell is difficult to ensure relative to the square shell, 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 dissipation performance.

The square housing is preferable as the outer shell in terms of structural stability and energy density.

The invention is provided with an electrolyte sharing chamber at the bottom of the shell; the electrolyte sharing chamber is communicated with the electrolyte areas of the inner cavities of the single batteries.

The electrolyte sharing chamber is an electrolyte accommodating chamber, and after the electrolyte sharing chamber is communicated with the electrolyte areas in the inner cavities of the single batteries, the electrolyte is required to be ensured not to be in contact with the external environment in the whole large-capacity battery.

The shell of the invention can adopt the following structural forms, taking a rectangular shell as an example:

1. The shell comprises a cylinder body with an open top and a cover plate; the bottom of the cylinder body is provided with an electrolyte sharing chamber;

The cylinder structure can be formed by die casting:

firstly, a cylinder body with an open top is formed in a die-casting mode, then an electrolyte sharing cavity is processed at the bottom of the cylinder body, a groove recessed towards the outer surface can be directly processed on the inner surface of the bottom of the cylinder body to serve as the electrolyte sharing cavity, a through hole penetrating the bottom of the cylinder body or a through groove extending along the arrangement direction of batteries can be formed in the bottom of the cylinder body, and then the electrolyte sharing cavity communicated with the through hole or the through groove is additionally arranged on the outer surface of the bottom of the cylinder body.

The cylinder structure can also be formed by stamping:

The cylinder body with the top open is formed in a stamping mode, and at the moment, the bottom of the cylinder body can be directly stamped to form a groove, and the groove is used as an electrolyte sharing chamber.

After the unit cells are placed in the cylinder, the top open end of the cylinder is sealed by the cover plate. Further, in order to improve the heat dissipation performance of such a high-capacity battery, the cover plate may be perforated, so that each battery cell post extends out of the perforation, and in order to ensure that the electrolyte does not contact with the outside, after each battery cell post extends out of the perforation, the perforation and the battery cell housing need to be fixed and sealed.

2. The shell comprises a U-shaped shell, a first cover plate, a second cover plate and a third cover plate; a U-shaped housing refers to a housing having a U-shaped cross section, i.e. a housing having three continuous open ends.

An electrolyte sharing chamber is arranged at the bottom of the U-shaped shell; the electrolyte sharing chamber is communicated with the electrolyte areas of the inner cavities of the single batteries.

The electrolyte sharing chamber is an electrolyte accommodating chamber, and after the electrolyte sharing chamber is communicated with the electrolyte areas in the inner cavities of the single batteries, the electrolyte is required to be ensured not to be in contact with the external environment in the whole large-capacity battery. The first cover plate and the third cover plate are respectively and hermetically covered at two opposite open ends of the U-shaped shell, and the second cover plate is covered at the top open end of the U-shaped shell, so that electrolyte is not in contact with the external environment in the high-capacity battery.

In order to improve the heat dissipation performance of such a high-capacity battery, a third through hole capable of extending the electrode post of each single battery may be 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; 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.

It should be noted that the second cover plate and the U-shaped housing may be separately disposed or may be in an integral structure; the second embodiment is mainly described below as an example, and the detailed description is given with reference to specific embodiments and drawings.

For convenience of description, the case length direction is defined as the x direction, the case width direction is defined as the y direction, and the case height direction is defined as the z direction in the following embodiments.

Example 1

As shown in fig. 2 and 3, the large-capacity battery of the present embodiment includes 9 parallel single batteries 1, and the number of the large-capacity batteries of the other embodiments can be adjusted according to actual requirements. Referring to fig. 4, the single battery 1 is a square-shell battery, and the square-shell battery includes an upper cover plate, a lower cover plate, a cylinder and a battery 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 1 shell, and the battery cell assembly is arranged in the single battery 1 shell.

The bottom of the shell of each single battery 1 is provided with a first through hole penetrating through the inner cavity of the shell;

Referring to fig. 3, the outer case of the present embodiment includes a U-shaped case 2, a first cover plate 3, a third cover plate 4, and a second cover plate 5; wherein the U-shaped housing 2 is provided separately from the second cover plate 5.

An electrolyte sharing chamber extending along the x direction is arranged at the bottom 6 of the U-shaped shell;

the electrolyte sharing chamber can adopt the following structural forms:

In the first structure, as shown in fig. 5, a pipe section 7 with a square or circular section is fixed on the outer surface of the bottom 6 of the U-shaped shell; a through hole is formed in the pipe wall and the bottom 6 of the U-shaped shell; the number of the through holes is multiple, and the through holes are in one-to-one correspondence with the first through holes of the single batteries and are communicated with the first through holes of the single batteries; or a strip-shaped through hole which is communicated with the first through holes of all the single batteries.

In the second structure, as shown in fig. 6 and 7, a first channel 8 extending along the x direction is arranged at the bottom 6 of the U-shaped shell, and the first channel 8 directly penetrates through the first through holes of the single batteries 1; for the first structure, the pipe section needs to be arranged independently, meanwhile, through holes need to be formed in the bottom 6 of the U-shaped shell and the pipe section, and the second structure is simple to process and manufacture.

The second structure can be realized in two ways:

In one way, as shown in fig. 6, a bending, stamping, die casting or aluminum extrusion process may be adopted to directly form the first channel 8 on the bottom 6 of the U-shaped housing, so that the inner surface of the bottom 6 of the U-shaped housing is formed to protrude in a direction away from the top of the U-shaped housing 2.

In order to realize effective heat dissipation, heat dissipation fins 9 extending along the x direction are arranged on the outer surface of the bottom 6 of the U-shaped shell and positioned on two sides of the first channel 8, and heat generated in the running process of the high-capacity battery can be timely dissipated through the fins 9.

In a second mode, as shown in fig. 7, at least two first supporting ribs 10 extending along the x direction are provided on the inner surface of the bottom 6 of the U-shaped housing, and the two first supporting ribs 10 and the region of the bottom 6 of the U-shaped housing located between the two first supporting ribs 10 form a first channel 8.

By adopting the electrolyte sharing chamber structure shown in fig. 7, the structural regularity of the whole large-capacity battery can be ensured, and on the same way, the density of the energy storage device can be ensured when the energy storage device is easily integrated based on the large-capacity battery; on the other hand, the insulating film (also referred to as a blue film or a protective film) can be coated on the outer surface of the battery as a whole, thereby improving the overall safety performance of the high-capacity battery.

The two ends of the first channel 8 in the yz plane in fig. 6 and 7 are open ends, and the openings at the two ends are sealed by the first cover plate 3 and the third cover plate 4; in other embodiments, the two ends of the first channel 8 in the yz plane may be directly blocked, but the molding mode is relatively complex.

In this embodiment, the first channel 8 may further be provided with a liquid injection port 11 (see fig. 3), and after the inner cavities of the respective unit batteries 1 are communicated with the electrolyte sharing chamber, electrolyte may be injected into the inner cavities of the respective unit batteries 1 and the electrolyte sharing chamber through the liquid injection port 11 again, so as to ensure continuity of the electrolyte, and the liquid exchange may be further realized through the liquid injection port 11 in the later stage.

In the case of not pouring liquid, the pouring port 11 needs to be sealed by a plug.

And in the third structure, gaps between the inner surface of the bottom 6 of the U-shaped shell and the outer surface of the lower cover plate of each single battery are used as electrolyte sharing chambers, and if the structure is adopted, the stability of each single battery in the shell needs to be improved by using an auxiliary structure.

In this embodiment, as shown in fig. 8, the second cover 5 is provided with a third through hole 12 for extending the pole of each unit cell 1; the second cover plate 5 covers the top open end of the U-shaped shell 2 and is connected with the open end in a sealing way; after the poles of the single batteries 1 extend out of the third through holes 12, the shell area corresponding to the third through holes 12 is fixedly sealed with the single battery shell. The edge of the third through hole 12 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 1 along the z direction are not completely equal, the case of the unit cell 1 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 12 and the unit cell case.

In order to overcome such a problem, a weak portion 15 may be provided at the peripheral region of the third through hole 12, and during welding, the dimensional difference of each unit cell in the z direction is compensated for by deformation of the weak portion 15 such that the poles of all the unit cells 1 protrude out of the third through hole 12. The weak portion 15 in this embodiment may be an annular groove formed along a peripheral region of the third through hole 12 with a center of the third through hole 12 as a center point. In other embodiments, the weak portion 15 may be an elongated groove formed in a peripheral region of the third through hole 12. In other embodiments, if there is a similar problem that all the poles of the unit cells 1 cannot extend out of the third through hole 12 completely at the same time, the weak portion 15 may be added to the peripheral area of the third through hole 12.

A sealing connection may also be added between the third through hole 12 and the pole, the sealing connection comprising a hollow member; 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 second cover plate 5 is matched with the shape of the top open end of the U-shaped shell 2, in the embodiment, the square shell is adopted, so that the square plate can be slightly larger than the area of the top open end of the U-shaped shell 2, and is fixed at the top open end of the U-shaped shell 2 in a fusion welding mode; the area of the opening end of the top of the U-shaped shell 2 can be slightly smaller than that of the opening end of the top of the U-shaped shell 2, and the opening end of the top of the U-shaped shell 2 is fixed by means of caulking.

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

step one, processing the U-shaped shell 2, the first cover plate 3, the third cover plate 4 and the second cover plate 5.

Step two, capacity-sorting, namely screening a plurality of single batteries meeting the requirements; a first through hole is formed in the bottom of the single battery shell, and then the single battery shell is sealed by a sealing assembly; arranging the single batteries with the sealing assemblies at the first through holes in the U-shaped shell 2 in the first step, wherein the sealing assemblies of the single batteries correspond to the first channels 8 so as to ensure that the electrolyte areas in the inner cavities of the single batteries are communicated with the first channels 8 after the sealing assemblies are opened by external force or electrolyte; the sealing assembly may be the one disclosed in chinese patent CN218525645U, CN 218525614U.

And thirdly, sealing and welding the second cover plate 5 at the top open end of the U-shaped shell 2, welding the third through hole 12 and the peripheral part of the single battery shell pole, and welding the first cover plate 3 and the third cover plate 4 at the other two opposite open ends of the U-shaped shell 2 to realize sealing. It should be noted here that the first cover plate 3 and the third cover plate 4 need to simultaneously seal the two open ends of the first channel 8 in the yz plane. The first cover plate, the second cover plate and the third cover plate can be fixed at the open end of the U-shaped housing 2 by means of screw fastening or gluing, but the tightness or connection reliability is relatively weak compared with the welding means.

And step four, opening the sealing assembly by using external force or electrolyte, wherein the inner cavity of the first channel 8 is communicated with the electrolyte areas of the inner cavities of all the single batteries.

After the inner cavities of the single batteries 1 are communicated with the first channels 8, electrolyte in the inner cavities of the single batteries 1 is communicated through the first channels 8, and in order to prevent the phenomenon of electrolyte interruption, electrolyte can be injected into the first channels 8 after the inner cavities of the single batteries 1 are communicated with the first channels 8 to ensure the continuity of the electrolyte.

All the unit cells 1 are then connected in parallel. Specifically, all the unit cells 1 may be connected in parallel by using the heat transfer connection element shown in fig. 9 and 10, and the heat transfer connection element is an elongated member for connecting with the positive electrode or the negative electrode of each unit cell; 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 are connected through the heat transfer connecting piece, and the heat transfer pipe is clamped on the heat transfer connecting piece, so that the local temperature of the pole column on each single battery can be controlled, and the occurrence of thermal runaway phenomenon caused by overhigh temperature of the pole column is greatly reduced.

In order to form a more complete SEI film, the high-capacity battery has more stable circulation capacity, and after electrolyte is injected into the inner cavities of all the single batteries 1 through the first channel 8, the whole high-capacity battery is formed.

Example 2

Unlike the large-capacity battery of embodiment 1, this embodiment is configured by adding a gas chamber to the second cover plate 5 as a gas sharing chamber or explosion venting passage. The structure is shown in fig. 11, and the first channel 8 in fig. 11 is shown in fig. 7, however, the first channel 8 may be shown in fig. 6.

The gas chamber may take the following forms:

1. A pipe section with a square or round section is fixed on the outer surface of the top of the second cover plate 5; through holes are formed in the pipe wall and the second cover plate 5;

2. the gaps between the inner surface of the second cover plate 5 and the outer surfaces of the upper cover plates of the individual unit cells are used as gas chambers.

3. As shown in fig. 12, a second channel 13 extending in the x direction is provided in the second cover plate 5; this structure is comparatively simple for first structure, and is comparatively high for the stability of second structure, each battery cell in the shell.

The second channel 13 can be formed directly in the second cover plate 5 by a bending or aluminium extrusion process, wherein the second channel 13 protrudes away from the bottom 6 of the U-shaped housing.

When the second channel 13 is used as a gas sharing chamber, a fifth through hole penetrating through the inner cavity of the single battery 1 needs to be formed in the top of the housing of each single battery 1, the second channel 13 is communicated with the fifth through hole, and the second channel 13 is communicated with the gas area of the inner cavity of each single battery 1 through the fifth through hole. In other embodiments, the second cover plate 5 and the top open end of the U-shaped housing 2 may be fixed by bonding or screw connection, but the sealing performance or connection reliability is relatively weak compared with the welding manner. In the operation process, the two ends of the second channel 13 (the open ends parallel to the yz plane) 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.

In the embodiment, the exhaust valve and the explosion venting membrane are arranged on the second channel 13, or only the exhaust valve is arranged; 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 1 can be discharged after passing through the second channel 13 and the exhaust valve; when the explosion venting valve is arranged, the vent valve and the explosion venting film are positioned at two ends of the second channel 13, and the explosion venting film is used for enabling the explosion venting film to be broken by thermal runaway smoke to be discharged out of the second channel 13 when thermal runaway occurs in any single battery 1, so that the high-capacity battery has higher safety performance.

Can be prepared by the following process:

On the basis of the preparation process of the embodiment 1, a fifth through hole is formed in the top of each single battery, and then the single battery is sealed by a sealing assembly; arranging the single batteries with the sealing assemblies at the fifth through holes in the U-shaped shell 2; the second cover plate 5 is welded on the open end of the top of the U-shaped shell 2 in a sealing way, so that a fifth through hole with a sealing component corresponds to the second channel 13, and the fifth through hole is communicated with the second channel 13 after the sealing component is opened by external force or electrolyte; the sealing component can adopt the sealing component disclosed in China patent CN218525645U, CN218525614U, and the third through hole 12 and the peripheral part of the pole of the single battery shell are welded to realize sealing. Finally, the sealing assembly is opened by external force or electrolyte, and the inner cavity of the second channel 13 is communicated with the gas area of the inner cavity of each single battery.

When the second channel 13 is used as an explosion venting channel, the second channel 13 covers the top explosion venting parts of all the single batteries 1, and when any explosion venting part of the single battery 1 is broken by inner cavity smoke, the gas area of the inner cavity of the single battery 1 is communicated with the inner cavity of the second channel 13;

Can be prepared by the following process:

on the basis of the preparation process of the embodiment 1, the second cover plate 5 is welded at the open end of the top of the U-shaped shell 2 in a sealing way, so that the explosion venting parts of all the single batteries correspond to the second channel 13, and the explosion venting parts are communicated with the second channel 13 after the explosion venting parts are broken through inner cavity smoke; and welding the third through hole 12 and the peripheral part of the pole of the single battery shell to realize sealing.

The explosion venting portion in this embodiment includes an explosion venting opening or an explosion preventing opening provided at the top of the unit cell 1 and having an explosion venting film.

Example 3

Unlike the above-described embodiment, the U-shaped housing 2 of the present embodiment is an integral piece with the second cover plate 5, and the structure of the integral piece is shown in fig. 13 and 14. The second cover plate 5 may or may not be provided with a gas chamber, and the following description will be given by taking the gas chamber as an example:

It will be appreciated that the housing of this embodiment comprises a barrel as shown in fig. 13 or 14 and first and third cover plates 3 and 4 for covering opposite open ends of the barrel; the first cover plate 3 and the third cover plate 4 are located on the yz plane, and it should be noted here that, while covering the opposite two open ends of the sealing cylinder, the first cover plate 3 and the third cover plate 4 need to cover and seal the opposite two open ends of the first channel 8 and the second channel 13.

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.

It should be noted that: when the cylinder shown in fig. 13 is extruded, the first channel 8 does not need to be formed at the same time, namely, the first supporting ribs 10 and the cylinder need to be arranged separately; in the extrusion of the cylinder shown in fig. 14, the first channels 8 are formed simultaneously.

The large-capacity battery of this embodiment can be produced by the following procedure, taking the structure shown in fig. 14 as an example:

step one, processing a cylinder, a first cover plate 3 and a third cover plate 4.

Step two, capacity-sorting, namely screening a plurality of single batteries meeting the requirements; a first through hole is formed in the bottom of the single battery shell, and then the single battery shell is sealed by a sealing assembly; a fifth through hole is formed in the top of the single battery shell, and then the single battery shell is sealed by a sealing assembly; arranging a plurality of single batteries with sealing assemblies in the cylinder body in the first step; the first through hole with the sealing component corresponds to the first channel 8, the fifth through hole with the sealing component corresponds to the second channel 13, and after the sealing component is opened by external force or electrolyte, the first through hole is communicated with the first channel 8, and the fifth through hole is communicated with the second channel 13; the sealing assembly may be the one disclosed in chinese patent CN218525645U, CN 218525614U. The poles of each single battery 1 extend out of the corresponding third through holes 12 on the second cover plate 5, and the third through holes 12 and the peripheral parts of the poles of the single battery shell are welded to realize sealing; it should be noted that, in order for each unit cell 1 to be smoothly arranged in the cylinder shown in fig. 14, the minimum dimension of the cylinder along the z direction needs to be larger than the dimension of the unit cell 1 along the z direction, and in order to ensure that the pole of each unit cell 1 can extend out of the third through hole 12 at the top of the cylinder, a second supporting rib needs to be added at the bottom of each unit cell 1;

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

1) Selecting a strip-shaped equal-height second supporting rib;

Fixing a plurality of single batteries 1 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 1 contacts with the bottom of the cylinder, and the pole of each unit cell 1 corresponds to the corresponding third through hole 12, but does not extend out of the third through hole 12; then supporting a plurality of single batteries 1 from the bottom by using a lifting tool, so that the bottom of each single battery 1 is separated from the bottom of the cylinder body, and the pole of each single battery 1 extends out of the corresponding third through hole 12; and then inserting a second long equal-height supporting rib along the x direction, and taking out the lifting tool.

It should be noted that, in the z direction, the dimensions of the second supporting ribs with the same height in the long strip shape need to satisfy: after the second supporting ribs are additionally arranged between the bottoms of the single batteries 1 and the bottom of the cylinder body, the pole posts of the single batteries 1 extend out of the corresponding third through holes 12.

2) Selecting a plurality of cushion blocks corresponding to the single batteries 1 one by one to form a second supporting rib;

The plurality of single batteries 1 are sequentially pushed into the inner cavity of the cylinder from any open end of the cylinder, after each single battery 1 is pushed into place, each cushion block is required to be inserted between the bottom of the single battery 1 and the bottom of the cylinder, the pole of the single battery 1 is ensured to completely extend out of the corresponding third through hole 12, and the sizes of the cushion blocks corresponding to the single batteries in the z direction in most cases are different.

3) Each single battery 1 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 1 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 1 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 1 extends out of the corresponding third through hole 12, and a second supporting rib is inserted between the bottom of each single battery 1 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 3 and the third cover plate 4 on the other two opposite open ends of the U-shaped shell 2.

And step four, opening the sealing assembly by using external force or electrolyte, wherein the inner cavity of the first channel 8 is communicated with the electrolyte area of the inner cavity of each single battery, and the inner cavity of the second channel 13 is communicated with the gas area of the inner cavity of each single battery.

After the inner cavities of the single batteries 1 are communicated with the first channels 8, electrolyte in the inner cavities of the single batteries 1 is communicated through the first channels 8, and in order to prevent the phenomenon of electrolyte interruption, electrolyte can be injected into the first channels 8 after the inner cavities of the single batteries 1 are communicated with the first channels 8 to ensure the continuity of the electrolyte.

All the unit cells 1 are then connected in parallel.

In order to form a more complete SEI film, the high-capacity battery has more stable circulation capacity, and after electrolyte is injected into the inner cavities of all the single batteries 1 through the first channel 8, the whole high-capacity battery is formed.

If the gas chamber is used as the explosion venting channel, the difference from the above steps is that:

in the second step, a fifth through hole is not required to be formed in the top of the single battery shell; arranging the single batteries with the sealing assemblies at the first through holes in the cylinder body of the first step; the first through hole with the sealing component corresponds to the first channel 8, so that after the sealing component is opened by external force or electrolyte, the first through hole is communicated with the first channel 8, the explosion venting parts at the tops of the single batteries correspond to the second channel 13, and after the explosion venting parts are broken by inner cavity smoke, the explosion venting parts are communicated with the second channel 13.

In the fourth step, the sealing component is opened by external force or electrolyte, and the inner cavity of the first channel 8 is communicated with the electrolyte area of the inner cavity of each single battery.

If the cylinder shown in fig. 13 is adopted, after a plurality of single batteries with sealing assemblies are arranged in the cylinder shown in fig. 13, the first supporting ribs 10 are inserted between the bottoms of the single batteries and the bottom of the cylinder to form the first channels 8, and meanwhile, the single batteries can be supported, so that the pole posts of the single batteries 1 can extend out of the third through holes 12 at the top of the cylinder. The same three ways as described above can be adopted to arrange a plurality of single batteries with sealing assemblies in the cylinder shown in fig. 13, and only the second supporting rib is needed to be replaced by the first supporting rib 10.

Example 4

On the basis of the embodiment, a plurality of partition plates 16 are additionally arranged in the inner cavity of the U-shaped shell 2 or the inner cavity of the barrel, and the inner cavity of the U-shaped shell 2 or the inner cavity of the barrel is divided into a plurality of single battery 1 installation cavities, as shown in fig. 15 and 16; the partition plate 16 may be a flat plate, or an i-shaped partition plate as shown in fig. 16, in which a vertical beam 17 of the i-shaped partition plate is parallel to the first cover plate 3 and the third cover plate 4 and contacts with the adjacent side walls of the two unit cells 1 in the yz plane, and one beam 18 of the i-shaped partition plate contacts with the side wall of the two unit cells 1 in the xz plane, and the other beam 18 of the i-shaped partition plate contacts with the other side wall of the two unit cells 1 in the xz plane. The stability of each single battery 1 in the installation cavity of the single battery 1 can be improved by additionally arranging the I-shaped partition plates.

In this embodiment, a single battery 1 is fixed in the installation cavity of each single battery 1, the side walls of two sides of each single battery 1 near the middle part are contacted with the partition plate 16, one side wall of two single batteries 1 near the outermost side is contacted with the partition plate 16, and the other side wall is contacted with the first cover plate 3 or the third cover plate 4, so that the installation stability of each single battery 1 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 1 can be prevented; in the third aspect, heat generated during the charge and discharge of each unit cell 1 can be transmitted to the outside through the separator 16, reducing the risk of occurrence of thermal runaway; the fourth aspect may also enhance the overall strength of the housing. In other embodiments, two or more single batteries 1 may be fixed in each single battery 1 installation cavity. But the stability is inferior to that of the unit cell 1 of the present embodiment.

Claims (29)

1. A high capacity battery characterized by: the solar cell module comprises a shell and a plurality of single cells (1), wherein the single cells (1) are sequentially connected in parallel and are arranged in an inner cavity of the shell; each single battery (1) inner cavity comprises an electrolyte area and a gas area;

the bottom of the shell is provided with an electrolyte sharing chamber;

The electrolyte sharing chamber is communicated with the electrolyte areas in the inner cavities of the single batteries (1).

2. The high-capacity battery according to claim 1, wherein: a third through hole (12) which can enable the pole of each single battery (1) to extend out is formed in the top of the shell; the poles of the single batteries (1) extend out of the third through holes (12), and the shell areas corresponding to the third through holes (12) are fixedly sealed with the single battery shell.

3. The high-capacity battery according to claim 2, wherein: the shell comprises a U-shaped shell (2), a first cover plate (3), a third cover plate (4) and a second cover plate (5);

The electrolyte sharing chamber is arranged at the bottom of the U-shaped shell (2);

The first cover plate (3) and the third cover plate (4) are respectively covered at two opposite open ends of the U-shaped shell (2);

The third through hole (12) is formed in the second cover plate (5); the second cover plate (5) covers the top open end of the U-shaped shell (2) and is connected with the open end in a sealing way.

4. A high-capacity battery as claimed in claim 3, wherein: the bottom of the shell of each single battery (1) is provided with a first through hole penetrating through the inner cavity of the shell;

the electrolyte sharing chamber is a first channel (8) arranged at the bottom of the U-shaped shell (2);

The first channel (8) is communicated with the first through hole.

5. The high-capacity battery as claimed in claim 4, wherein: the bottom of the U-shaped shell (2) protrudes towards a direction away from the top of the U-shaped shell (2) to form a first channel (8).

6. The high-capacity battery according to claim 5, wherein: the outer surface areas of the U-shaped shell bottom (6) positioned at the two sides of the first channel (8) are provided with radiating fins (9).

7. The large-capacity battery according to any one of claims 3 to 6, wherein: the U-shaped shell (2) and the second cover plate (5) are integrated.

8. The high-capacity battery as claimed in claim 7, wherein: the U-shaped shell (2) and the second cover plate (5) are integrally formed by adopting an aluminum extrusion process.

9. The high-capacity battery as claimed in claim 7, wherein: be equipped with the second brace rod between U-shaped casing (2) bottom and each battery cell (1) bottom, the high needs of second brace rod satisfy: after each single battery (1) is supported by the second supporting ribs, the pole of each single battery (1) needs to be ensured to extend out of a third through hole (12) formed in the second cover plate (5).

10. The high-capacity battery according to claim 9, wherein: the peripheral area of the third through hole (12) is provided with a weak part (15).

11. The high-capacity battery as claimed in claim 4, wherein: at least two first supporting ribs (10) extending along the arrangement direction of the single batteries are arranged on the inner surface of the bottom of the U-shaped shell (2), and a first channel (8) is formed by the two first supporting ribs (10) and the bottom area of the U-shaped shell (2) positioned between the two first supporting ribs (10).

12. The high-capacity battery as claimed in claim 11, wherein: the U-shaped shell (2) and the second cover plate (5) are integrated.

13. The high-capacity battery as claimed in claim 12, wherein: the U-shaped shell (2) and the second cover plate (5) are integrally formed by adopting an aluminum extrusion process.

14. The high-capacity battery as claimed in claim 12, wherein: the peripheral area of the third through hole (12) is provided with a weak part (15).

15. A high-capacity battery as claimed in claim 3, wherein: a separator (16) is arranged between two adjacent single batteries (1).

16. The high-capacity battery as claimed in claim 15, wherein: the separator (16) is an I-shaped separator, a vertical beam (17) of the I-shaped separator is in contact with the side wall of the two single batteries (1) adjacent to the side wall of the yz plane, one cross beam (18) of the I-shaped separator is in contact with the side wall of the two single batteries (1) in the xz plane, and the other cross beam (18) of the I-shaped separator is in contact with the other side wall of the two single batteries (1) in the xz plane.

17. A high-capacity battery as claimed in claim 3, wherein: a gas chamber is arranged on the second cover plate (5);

The gas chamber covers the top explosion venting part of each single battery (1), and when any single battery (1) explosion venting part is broken by inner cavity smoke, the gas area of the inner cavity of the single battery (1) is communicated with the inner cavity of the gas chamber;

Or, a fifth through hole penetrating through the inner cavity of each single battery (1) is formed in the top of the shell of each single battery (1), the fifth through hole is covered by the gas chamber, and the inner cavity of the gas chamber is communicated with the gas area of the inner cavity of each single battery (1) through the fifth through hole.

18. The high-capacity battery as claimed in claim 17, wherein: the second cover plate (5) protrudes to a direction away from the bottom of the U-shaped shell (2) to form a second channel (13) serving as a gas chamber.

19. The high-capacity battery as claimed in claim 17, wherein: the U-shaped shell (2) and the second cover plate (5) are integrated.

20. The high-capacity battery as claimed in claim 19, wherein: the U-shaped shell (2) and the second cover plate (5) are integrally formed by adopting an aluminum extrusion process.

21. The high-capacity battery as claimed in claim 19, wherein: be equipped with the supporting rib between U-shaped casing (2) bottom and each battery cell (1) bottom, the high needs of supporting rib satisfy: after each single battery (1) is supported by the supporting ribs, the pole of each single battery (1) needs to be ensured to extend out of a third through hole (12) formed in the second cover plate (5).

22. The high-capacity battery as claimed in claim 21, wherein: the peripheral area of the third through hole (12) is provided with a weak part (15).

23. The high-capacity battery as claimed in claim 17, wherein: a separator (16) is arranged between two adjacent single batteries (1).

24. The high-capacity battery as claimed in claim 23, wherein: the separator (16) is an I-shaped separator, a vertical beam (17) of the I-shaped separator is in contact with the side wall of the two single batteries (1) adjacent to the side wall of the yz plane, one cross beam (18) of the I-shaped separator is in contact with the side wall of the two single batteries (1) in the xz plane, and the other cross beam (18) of the I-shaped separator is in contact with the other side wall of the two single batteries (1) in the xz plane.

25. A high-capacity battery according to claim 2 or 3, wherein: the heat transfer connecting piece is an elongated member and 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.

26. A housing for containing a plurality of cells, characterized by: comprises a U-shaped shell (2), a first cover plate (3), a third cover plate (4) and a second cover plate (5);

the bottom of the U-shaped shell (2) is provided with an electrolyte sharing chamber; the electrolyte sharing chamber is used for communicating with electrolyte areas in the inner cavities of the single batteries (1);

The first cover plate (3) and the third cover plate (4) are respectively covered at two opposite open ends of the U-shaped shell (2);

A third through hole (12) which can enable the pole of each single battery (1) to extend out is formed in the second cover plate (5); the second cover plate (5) covers the top open end of the U-shaped shell (2) and is connected with the open end in a sealing way.

27. The housing of claim 26, wherein: and a gas chamber is arranged on the second cover plate (5).

28. The housing according to claim 26 or 27, wherein: the U-shaped shell (2) and the second cover plate (5) are integrated.

29. The housing of claim 28, wherein: the U-shaped shell (2) and the second cover plate (5) are integrally formed by adopting an aluminum extrusion process.