CN219892382U

CN219892382U - High-capacity battery

Info

Publication number: CN219892382U
Application number: CN202320755381.9U
Authority: CN
Inventors: 白晓峰; 雷政军; 郑高锋
Original assignee: Shaanxi Olympus Power Energy Co Ltd
Current assignee: Shaanxi Olympus Power Energy Co Ltd
Priority date: 2023-04-07
Filing date: 2023-04-07
Publication date: 2023-10-24
Anticipated expiration: 2033-04-07

Abstract

The utility model relates to the field of batteries, in particular to a high-capacity battery. The problem that the upper limit of the capacity of the existing large-capacity battery is limited by a single battery with the worst performance of the circulation times is solved. Comprises a first hollow component and a plurality of unit batteries connected in parallel; each single battery inner cavity comprises an electrolyte area and a gas area; the first hollow member comprises a first hollow box body with an open bottom and a first cover plate for covering the open bottom; the first hollow member extends along the arrangement direction of the plurality of single batteries, is fixed at the bottom of each single battery, is communicated with the inner cavities of the single batteries, and the electrolyte areas of the single batteries are communicated through the first hollow member. According to the utility model, the first hollow member is additionally arranged, so that the electrolyte of each single battery is shared to ensure the consistency of each single battery, and the cycle life of the high-capacity battery is prolonged.

Description

High-capacity battery

Technical Field

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

Background

The conventional large-capacity battery (also referred to as a battery module or a battery pack) is generally manufactured by connecting a plurality of single batteries in parallel or in series, for example, chinese patent CN106531913B discloses a prismatic battery module, which comprises a plurality of prismatic battery single batteries and a module frame, wherein the module frame is a housing with an open upper end, and the plurality of prismatic battery single batteries are arranged into any series-parallel combined battery modules according to design requirements and then are fixed in the module frame. The high-capacity battery directly manufactured in a serial-parallel connection mode is often influenced by a single battery with the worst performance due to the existence of a barrel effect, so that the upper limit of the capacity and the circulation times of the whole high-capacity battery are greatly limited.

Disclosure of Invention

The utility model aims to provide a high-capacity battery, which solves the problem that the upper limit of the capacity and the circulation number of the existing high-capacity battery are limited by a single battery with the worst performance.

The technical scheme of the utility model is to provide a high-capacity battery, which is characterized in that: comprises a first hollow component and a plurality of unit batteries connected in parallel; each single battery inner cavity comprises an electrolyte area and a gas area;

the first hollow member comprises a first hollow box body with an open bottom and a first cover plate for covering the opening; the first hollow member extends along the arrangement direction of the plurality of single batteries, is fixed at the bottom of each single battery through the top of the first hollow box body, is communicated with the inner cavities of the single batteries, and the electrolyte areas of the single batteries are communicated through the first hollow member.

In order to facilitate processing, the bottom of the shell of each single battery is provided with a first through hole; and the bottom of the first hollow component is provided with second through holes which 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.

Further, in order to realize mass production, orthographic projection of the second through holes on the bottoms of the single batteries completely covers the corresponding first through holes; the first hollow member is connected with the bottoms of the single batteries specifically through the following processes:

Positioning the first hollow box body at the bottom of each single battery so that each first through hole corresponds to each second through hole one by one;

extending the welding head from the bottom open end of the first hollow box body to the edge part of the second through holes, and sealing and welding the edges of the second through holes with the bottoms of the corresponding single batteries; the first through holes of the single batteries are communicated with the corresponding second through holes;

and sealing and welding the first cover plate at the bottom open end of the first hollow box body.

Further, one end of the first hollow member is provided with a liquid injection port; the other end is provided with a venting rupture disk which is used for being broken by thermal runaway smoke and discharged out of the hollow member when any single battery is in thermal runaway.

Further, a plurality of positioning grooves are formed in the top of the first hollow box body, and all the single batteries are clamped into the corresponding positioning grooves to position the hollow box body at the bottoms of all the single batteries.

In order to further reduce the variability between individual cells, the above-described high-capacity battery further includes a second hollow member; the second hollow member comprises a second hollow box body with an open top and a second cover plate for covering the open top; the second hollow member extends along the arrangement direction of the plurality of single batteries, is fixed at the top of each single battery through the bottom of the second hollow box body, is communicated with the inner cavity of each single battery, and the gas area of each single battery is communicated through the second hollow member.

In order to facilitate processing, a third through hole is formed in the top of the shell of each single battery; and the bottom of the second hollow member is provided with fourth through holes which are in one-to-one correspondence with and are communicated with the third through holes of the single batteries.

Further, in order to realize mass production, the orthographic projection of the fourth through hole on the top of each single battery completely covers the corresponding third through hole; the second hollow member is connected with the top of each single battery specifically through the following process:

positioning the bottom of the second hollow box body and the top of each single battery so that each third through hole corresponds to each fourth through hole one by one;

extending the welding head from the top open end of the second hollow box body to the edge part of the fourth hole, and sealing and welding the edges of the fourth holes with the tops of the corresponding single batteries; the third through holes of the single batteries are communicated with the corresponding fourth through holes;

and sealing and welding the second cover plate at the top open end of the second hollow box body.

Further, the third through hole and the fourth through hole may be further penetrated by a third hollow member:

the caliber of the specific fourth through hole is required to be slightly larger than the caliber of the connecting end of the third hollow member and the fourth through hole, so that the third hollow member can be inserted into the fourth through hole; the second hollow member is connected with the top of each single battery specifically through the following process:

Welding each third hollow member at a third through hole of each single battery respectively;

positioning the second hollow box body and the bottoms of all the single batteries so that all the third hollow members correspond to all the fourth through holes one by one, and ensuring that all the third hollow members are inserted into the fourth through holes;

extending the welding head from the top open end of the second hollow box body to the edge part of the fourth hole, and welding each fourth hole edge with the outer wall of the corresponding third hollow member to realize sealing;

Further, in order to improve the safety performance of the large-capacity battery, an exhaust valve is provided in the second hollow member. The exhaust valve can be opened manually or automatically, and the gas in the gas area in each single battery can be discharged after passing through the second hollow component and the exhaust valve.

The beneficial effects of the utility model are as follows:

1. according to the high-capacity battery provided by the utility model, the first hollow member is additionally arranged, so that the electrolyte of each single battery is shared to ensure the consistency of each single battery, namely, the electrolyte cavities of all the single batteries are communicated, so that the electrolytes of all the single batteries are in the same system, the difference among the electrolytes of all the single batteries is reduced, the consistency among the single batteries is improved to a certain extent, and the cycle life of the high-capacity battery is prolonged to a certain extent. And through setting up first cavity component as split structure, be convenient for fix its open end from first cavity box in the bottom of each battery cell, reduce the processing degree of difficulty and processing cost, the yield is higher.

2. The utility model designs the first hollow component as a split piece, wherein one part of the split piece is a first hollow box body with one end open, the other part of the split piece is a first cover plate for covering the opening of the first hollow box body, and a second through hole is formed in the bottom of the first hollow box body opposite to the opening end; when concrete welding, the welding head stretches into from open end, welds the border of second through-hole and each battery cell bottom, realizes the link up of first through-hole and second through-hole, accomplishes the connection of first hollow box and each battery cell simultaneously, welds first apron at open end at last. The utility model only needs to ensure that the orthographic projection of the second through holes at the bottom of each single battery covers the corresponding first through holes, each first through hole is positioned on the same plane as much as possible, each second through hole is positioned on the same plane as much as possible, concentricity of the first through holes and the second through holes and consistency of each first through hole and the second through hole are not needed to be considered, the requirements on processing precision are lower, and the influence of the processing precision and assembly precision on the product yield is weakened; and during welding, the welding head stretches into from the open end, does not have any shielding, can once only accomplish the welding of second through hole border and each battery cell bottom, and the process is simple, and sealed effectual, can realize batch production.

3. The utility model also provides a liquid injection port and a explosion venting membrane on the first hollow member, and liquid injection and replacement can be realized through the liquid injection port, so that the performance of the high-capacity battery is further improved; the explosion venting membrane is used for breaking the explosion venting membrane by thermal runaway smoke and discharging the explosion venting membrane out of the hollow component when thermal runaway occurs to any single battery, so that the safety performance of the high-capacity battery is further improved.

4. According to the high-capacity battery provided by the utility model, the second hollow member is additionally arranged, so that the gas paths of all the single batteries are communicated to improve the consistency of all the single batteries, namely, the gas areas of all the single batteries are communicated, so that the gas of all the single batteries is in the same environment, the difference among the single batteries is further reduced, the consistency among the single batteries is improved, and the cycle life of the high-capacity battery is further prolonged. Also, through setting up the second cavity component as split structure, be convenient for fix its open end at each battery cell's top from the second cavity box, reduce the processing degree of difficulty and processing cost, the yield is higher.

5. The utility model designs the second hollow component as a split piece, wherein one part of the split piece is a second hollow box body with one end open, the other part of the split piece is a second cover plate for covering the opening of the second hollow box body, and a fourth through hole is formed in the bottom of the second hollow box body opposite to the opening end; when the welding head stretches into from the open end, the edge of the fourth through hole is welded with the tops of all the single batteries, the through of the third through hole and the fourth through hole is achieved, the second hollow box body is connected with all the single batteries, and finally the second cover plate is welded at the open end. According to the utility model, only the orthographic projection of the fourth through hole on the top of each single battery is required to cover the corresponding third through hole, each third through hole is located on the same plane as much as possible, each fourth through hole is located on the same plane as much as possible, concentricity of the third through hole and the fourth through hole and consistency of each third through hole and the fourth through hole are not required to be considered, requirements on processing precision are low, and influences of processing and assembling precision on product yield are weakened; and during welding, the welding head stretches into from the open end, no shielding is caused, the welding between the edge of the fourth through hole and the top of each single battery can be completed at one time, the process is simple, the sealing effect is good, and batch production can be realized.

6. The third through hole and the fourth through hole are communicated in a sealing way through the third hollow member, and a welding mode can be adopted, in the specific welding, the third hollow member is welded at the third through hole, then the third hollow member is inserted into the fourth through hole, a welding head extends into the edge part of the fourth through hole from the open end of the second hollow box body, and the edges of the fourth through holes are welded with the outer wall of the corresponding third hollow member to realize sealing; at the moment, only the caliber of one end of the third hollow member matched with the fourth through hole is smaller than that of the fourth through hole, so that the third hollow member can be inserted into the fourth through hole, tightness between the third hollow member and the fourth through hole is not required, and sealing of the third hollow member and the fourth through hole is realized through welding, so that the concentricity requirement on the third hollow member and the fourth through hole is low, the requirement on processing precision is low, and the influence of the processing precision on the product yield is weakened; and during welding, the welding head stretches into from the open end, is not shielded, can finish the welding of fourth hole border and third cavity component lateral wall once only, and the process is simple, and sealed effectual, can realize batch production.

7. The exhaust valve is arranged on the second hollow component, the exhaust valve is opened periodically, and the gas in the gas area in each single battery can be exhausted after passing through the second hollow component and the exhaust valve, so that the safety performance of the high-capacity battery is further improved.

Drawings

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

fig. 2 is a schematic structural diagram of a single cell of embodiment 1;

FIG. 3 is a schematic view of the structure of a first hollow member of embodiment 1;

fig. 4 is a schematic diagram illustrating an assembly process of each unit cell and the first hollow member according to embodiment 1;

fig. 5 is a schematic view showing the structure of a large-capacity battery according to embodiment 2;

FIG. 6 is a schematic view showing the structure of a second hollow member of embodiment 2;

fig. 7 is a schematic structural diagram of a single cell of embodiment 2;

fig. 8 is a schematic diagram showing an assembly process of each unit cell and the second hollow member according to embodiment 2;

fig. 9 is a schematic diagram II of the assembly process of each unit cell and the second hollow member in embodiment 2;

fig. 10 is a schematic diagram III of the assembly process of each unit cell and the second hollow member in embodiment 2;

FIG. 11 is a schematic diagram of a single cell of example 3;

fig. 12 is a schematic diagram showing an assembly process of each unit cell and the first hollow member according to embodiment 5;

the reference numerals in the drawings are: 1. a single battery; 2. a first hollow member; 3. a first hollow case; 4. a first cover plate; 5. the top of the first hollow box body; 6. a first through hole; 7. a second through hole; 8. an open end; 9. a positioning groove; 10. a second hollow member; 11. a second hollow box; 12. a second cover plate; 13. the bottom of the second hollow box body; 14. a third through hole; 15. a fourth through hole; 16. a third hollow member; 17. a liquid injection port; 18. a second through hole edge; 19. a sealing plug; 20. a finished battery; 21. a housing; 22. a fifth through hole; 23. an upper cover plate; 24. and a lower cover plate.

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, fifth or sixth" 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 plurality of unit batteries connected in parallel, wherein each inner cavity of the unit battery comprises a gas area and an electrolyte area; the electrolyte areas of the individual cells are connected by a first hollow member. The first hollow member is a hollow box body, and a hollow box body with a rectangular cross section can be adopted, or a hollow box body with a semicircular cross section can be adopted. According to the utility model, the first hollow member is arranged at the bottom of each single battery and is communicated with the inner cavity of each single battery, so that the electrolyte areas of each single battery are communicated through the first hollow member. The specific first hollow component adopts split structure, including the open first hollow box in bottom and be used for covering open first apron, be convenient for fix it in the bottom of each battery cell from the open end of first hollow box, if can adopt welded mode fixed, also can adopt threaded connection to cooperate sealed mode fixed of sealing washer.

According to the utility model, through the first hollow member, the electrolyte of each single battery is shared to ensure the consistency of each single battery, namely, the electrolyte cavities of all the single batteries are communicated, so that the electrolytes of all the single batteries are in the same system, the difference among the electrolytes of all the single batteries is reduced, the consistency among the single batteries is improved to a certain extent, and the cycle life of the high-capacity battery is prolonged to a certain extent.

The utility model is further described below with reference to examples.

Example 1

As shown in fig. 1, the large-capacity battery in this embodiment includes 9 parallel single batteries 1, and the number of the single batteries in other embodiments can be adjusted according to actual requirements. Referring to fig. 2, the single battery 1 is a single square battery, and the single square battery includes an upper cover plate 23, a lower cover plate 24, 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 23, the cylinder body and the lower cover plate 24 form a battery shell, and the battery cell assembly is arranged in the battery shell. Referring to fig. 3, in order to facilitate subsequent processing and assembly, the first hollow member 2 of this embodiment has a rectangular cross section, extends along the arrangement direction of the plurality of unit cells 1, and is fixed to the bottom of each unit cell 1, where the bottom can be understood as the lower cover 24 of each unit cell 1. The electrolyte areas of the respective unit cells 1 are communicated through the first hollow members 2 (in fig. 1, wherein the sizes of the first hollow members in the a-drawing and the b-drawing are different in the width direction of the unit cells). The method is realized by the following scheme:

1) This can be achieved by making openings in the lower cover plate 24 of each cell 1 and in the first hollow member 2, in particular by providing the lower cover plate 24 of each cell 1 with a first through hole 6 (see fig. 2); second through holes 7 (see fig. 3) corresponding to the first through holes 6 of the single batteries 1 are correspondingly formed in the top 5 of the first hollow box body. After the first through holes 6 and the second through holes 7 are penetrated, the electrolyte in each single battery 1 can enter the first hollow member 2 through the first through holes 6 and the second through holes 7.

2) The opening of the first hollow member 2 and any side wall of the cylinder of each single battery 1 can be realized, specifically, a first through hole 6 is arranged on any side wall of the cylinder of each single battery 1; second through holes 7 corresponding to the first through holes 6 of the single batteries 1 one by one are correspondingly formed in the top 5 of the first hollow box body. After the first through holes 6 and the second through holes 7 are communicated through the external pipelines, electrolyte in each single battery 1 can enter the first hollow member 2 through the first through holes 6 and the second through holes 7. But this solution is relatively complex, so this embodiment prefers solution 1).

When the scheme 1) is adopted, the penetration of the first through hole 6 and the second through hole 7 may adopt the following scheme:

The first hollow component 2 is formed by directly performing sealing grafting by interference fit of a plurality of sections of first sub-pipelines; at this time, the first sub-pipelines of the multiple sections are arranged on the lower cover plate 24 of the single battery 1 one by one, extend along the arrangement direction of the single battery 1, are integrally extruded with the lower cover plate 24, and are communicated with the first through hole 6 of the lower cover plate 24.

During assembly, first sub-pipelines are integrally formed on the lower cover plate 24, and in order to facilitate the plugging between the two first sub-pipelines, the length of the first sub-pipelines needs to be longer than that of the lower cover plate, that is, at least one end of the first sub-pipelines serving as a connecting end needs to extend out of the lower cover plate at the moment, so that effective connection between the two first sub-pipelines can be ensured. And then the lower cover plate 24 is welded with the cylinder, then the battery cell assembly is assembled, and the upper cover plate 23 is welded, so that the single battery 1 is assembled. According to this method, all the unit cells 1 are assembled. And then, two ends of the first sub-pipeline are used as connecting ends with the other sub-pipeline, when the two single batteries 1 are connected, one end of the first sub-pipeline on one single battery 1 is extruded into the first sub-pipeline of the other single battery 1, and the two ends are in interference fit, so that the tightness after extrusion is ensured. And then electrolyte is injected into the inner cavity through the liquid injection port. The liquid injection port may be a liquid injection port on each unit cell 1, or may be a liquid injection port formed on the first hollow member 2, so as to facilitate liquid injection. In addition, before electrolyte is injected into the inner cavity, the environment of the inner cavity needs to be ensured to be the environment with dew point standard of-25 to 40 ℃, humidity of less than or equal to 1 percent, temperature of 23+/-2 ℃ and cleanliness of 10 ten thousand grades. The inner cavity can reach the environmental standard by vacuumizing before liquid injection. In addition, the liquid injection port formed in each unit cell or the first hollow member needs to be sealed by a plug when no liquid is injected.

According to the scheme, through the first hollow member in the plug-in mode, electrolyte cavities of all the single batteries are communicated, electrolyte of all the single batteries is located under the same system, differences among the electrolyte of all the single batteries are reduced, consistency among the single batteries is improved to a certain extent, and therefore the cycle life of the large-capacity battery is prolonged to a certain extent.

This scheme requires each first sub-pipeline coaxial in the grafting process, just can realize effective connection, however, makes the axiality of each first sub-pipeline difficult to guarantee because of following reason:

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

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

3) According to the scheme, when the first sub-pipelines are spliced, special tools are needed, and due to improper use of the tools or operation problems of constructors, the coaxiality of the first sub-pipelines is deviated;

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

In summary, in this solution, the sub-pipes of two adjacent unit batteries 1 are difficult to be coaxial, so that when the sub-pipes are plugged, the first sub-pipe may be displaced relative to the lower cover 24, or the lower cover may be displaced relative to the cylinder, thereby damaging the battery.

The second scheme is that the first hollow member 2 comprises a hollow box body with a rectangular cross section, wherein the hollow box body is of a split structure and consists of a first hollow box body 3 with an open end 8 at the top and a first cover plate 4 for covering the open end 8; a second through hole 7 is formed in the top 5 of the first hollow box body;

during assembly, firstly, the cylinder body and the lower cover plate 24 are welded, the battery cell assembly is assembled, then the upper cover plate 23 is welded, and the assembly of the spare single battery is completed, wherein the spare single battery can be understood as a single battery which does not comprise electrolyte; secondly, as shown in fig. 4, the top 5 of the first hollow box body and the bottom of each spare battery cell are positioned, so that each first through hole 6 corresponds to each second through hole 7 one by one, and the projection of each second through hole 7 on the bottom of each spare battery cell is ensured to completely cover the corresponding first through hole 6, and the positioning can be realized through a positioning groove 9 shown in fig. 3; extending the welding head from the bottom open end 8 of the first hollow box body 3 to the edge part of the second through holes 7, and sealing and welding the edges of each second through hole 7 with the lower cover plate 24 of the corresponding spare single battery; so that the first through holes 6 of each spare battery cell are communicated with the corresponding second through holes 7; the first cover plate 4 is welded on the bottom open end 8 of the first hollow box body 3 in a sealing way. And finally, injecting electrolyte into the inner cavity through the liquid injection port. The liquid injection port is formed in the first hollow component so that liquid can be conveniently injected, and liquid exchange can be realized through the liquid injection port in the later stage. In addition, before electrolyte is injected into the inner cavity, the environment of the inner cavity needs to be ensured to be the environment with dew point standard of-25 to 40 ℃, humidity of less than or equal to 1 percent, temperature of 23+/-2 ℃ and cleanliness of 10 ten thousand grades. The inner cavity can reach the environmental standard by vacuumizing before liquid injection. It should be noted that the welding head as used herein refers to a member of the welding apparatus extending into the portion to be welded, if arc welding or argon arc welding is used, the welding head as used herein refers to an end portion of the electrode, and if laser welding is used, the welding head as used herein refers to a laser beam.

In the first step, electrolyte can be directly injected into the spare single battery, and the first through hole is sealed by the sealing component; and separating a plurality of single batteries meeting the requirements. After the first hollow member and each single battery are welded, the sealing assembly is opened under the action of external force or electrolyte, so that the first through hole 6 is communicated with the corresponding second through hole 7.

During assembly, the first hollow components can be welded on each lower cover plate, so that the first through holes on each lower cover plate are communicated with the corresponding second through holes; then, each cylinder is welded on the corresponding lower cover plate, and then is filled into the battery cell assembly, and the upper cover plate is welded; and finally, injecting electrolyte into the cavity of the high-capacity battery through the first hollow member to form the battery.

According to the scheme, the first hollow components do not need to be spliced, the problem of splicing coaxiality is not needed to be considered in the arrangement direction of the single batteries, only the first through holes 6 are needed to be positioned on the same plane as much as possible, the second through holes 7 are needed to be positioned on the same plane as much as possible, concentricity of the first through holes 6 and the second through holes 7 and consistency of the first through holes 6 and the second through holes 7 are not needed to be considered, requirements on machining precision and assembly precision are low, and influences of the machining precision and the assembly precision on the finished product rate are weakened; meanwhile, a special tool is not needed, and the assembly process is simpler; and during welding, the welding head stretches into from the open end 8, no shielding is caused, the welding between the edge of the second through hole 7 and the bottom of each single battery can be completed at one time, the process is simple, the sealing effect is good, and batch production can be realized.

By comparing and analyzing the schemes, the structure and the assembly method of the second scheme are selected in the embodiment.

In this embodiment, the first hollow member 2 may be provided with a venting rupture disk, and when thermal runaway occurs in any of the unit cells 1, the thermal runaway flue gas breaks the venting rupture disk and is discharged out of the first hollow member 2.

Example 2

Unlike embodiment 1, this embodiment provides a second hollow member 10 on the basis of embodiment 1; as shown in fig. 5, the second hollow member 10 extends along the arrangement direction of the plurality of unit cells 1, is fixed on top of each unit cell, and is communicated with the inner cavity of each unit cell 1, and the gas areas of each unit cell 1 are communicated through the second hollow member 10. In this embodiment, the second hollow member 10 is added to enable the gas paths of the single batteries 1 to be communicated to improve the consistency of the single batteries 1, that is, the gas areas of the single batteries 1 are communicated, so that the gases of all the single batteries 1 are in the same environment, the difference between the single batteries 1 is further reduced, the consistency between the single batteries 1 is improved, and the cycle life of the high-capacity battery is further prolonged.

Referring to fig. 6, in order to facilitate subsequent processing and assembly, in this embodiment, the second hollow member 10 has the same structure as the first hollow member 2, and is a hollow box with a rectangular cross section, and the second hollow member 10 extends along the arrangement direction of the plurality of unit cells 1 and is fixed on top of each unit cell 1, where the top can be understood as an upper cover plate 23 of each unit cell 1. The gas regions of the respective unit cells 1 are communicated through the second hollow member 10. The method is realized by the following scheme:

1) This can be achieved by perforating the upper cover plate 23 of each cell 1 and the second hollow member 10, specifically by providing the upper cover plate 23 of each cell 1 with a third through hole 14, see fig. 7; fourth through holes 15 which are in one-to-one correspondence with the third through holes 14 of the single batteries 1 are correspondingly formed in the bottom 13 of the second hollow box body, as shown in fig. 6. After the third through hole 14 and the fourth through hole 15 are penetrated, the electrolyte in each unit cell 1 can enter the second hollow member 10 through the third through hole 14 and the fourth through hole 15.

2) The cylindrical body of each single battery 1 and the second hollow member 10 can be perforated, specifically, the cylindrical body of each single battery 1 is provided with a third through hole 14; fourth through holes 15 which are in one-to-one correspondence with the third through holes 14 of the single batteries 1 are correspondingly formed in the bottom 13 of the second hollow box body. After the third through hole 14 and the fourth through hole 15 are penetrated through the pipe, the gas in each unit cell 1 can enter the second hollow member 10 through the third through hole 14 and the fourth through hole 15. But this solution is relatively complex, so this embodiment prefers solution 1).

When the scheme 1) is adopted, the following scheme can be adopted for the penetration of the third through hole 14 and the fourth through hole 15:

The first scheme is that the second hollow component 10 is formed by directly performing sealing grafting by interference fit of a plurality of sections of second sub-pipelines; at this time, the second sub-pipelines are arranged on the upper cover plate 23 of the single battery 1 one by one, extend along the arrangement direction of the single battery 1, are integrally extruded with the upper cover plate 23, and are communicated with the third through hole 14 of the upper cover plate 23.

During assembly, the upper cover plate 23 and the lower cover plate 24 respectively squeeze the second sub-pipeline and the first sub-pipeline, then the upper cover plate 23 is welded with the cylinder body, then the battery cell assembly is assembled, and the lower cover plate 24 is welded, so that the assembly of the single battery 1 is completed. According to this method, all the unit cells 1 are assembled. And then, two ends of the first sub-pipeline are used as connecting ends with the other first sub-pipeline, two ends of the second sub-pipeline are used as connecting ends with the other second sub-pipeline, when two single batteries 1 are connected, one end of the first sub-pipeline on one single battery 1 is extruded into the first sub-pipeline of the other single battery 1, interference fit is adopted between the two ends, and one end of the second sub-pipeline on the single battery 1 is extruded into the second sub-pipeline of the other single battery 1, interference fit is adopted between the two ends, so that the tightness after extrusion is finished is ensured. And then the electrolyte is injected into the inner cavity after vacuumizing through the liquid injection port.

This scheme, similar to the scheme that the first hollow member is formed by directly performing sealing and plugging by interference fit between the first sub-pipelines of the multiple sections in embodiment 1, has corresponding problems, and when the first hollow member adopts a plugging form, the scheme needs to plug the first hollow member 2 and the second hollow member 10 at the same time, which has extremely high requirements on processing precision, and is difficult to realize batch production.

The second scheme is that the second hollow member 10 comprises a hollow box body with a rectangular cross section, wherein the hollow box body is of a split structure and consists of a second hollow box body 11 with an open end 8 at the top and a second cover plate 12 for covering the open end 8; a fourth through hole 15 is formed in the bottom 13 of the second hollow box body;

during assembly, firstly, the cylinder body and the upper cover plate 23 are welded, the battery cell assembly is assembled, and then the lower cover plate 24 is welded, so that the assembly of the spare single battery is completed; secondly, the second hollow box 11 is positioned with the top of each spare battery cell, so that each third through hole 14 corresponds to each fourth through hole 15 one by one, and the projection of each fourth through hole 15 on the top of each spare battery cell is ensured to completely cover the corresponding third through hole 14; extending the welding head from the top open end 8 of the second hollow box 11 to the edge part of the fourth through hole 15, and sealing and welding the edges of each fourth through hole 15 with the upper cover plate 23 of the corresponding spare single battery; so that the third through holes 14 of the respective unit cells 1 are communicated with the corresponding fourth through holes 15; the second cover plate 12 is sealed and welded to the top open end 8 of the second hollow housing 11 as shown in fig. 8 and 9. Thirdly, the first hollow components are welded and positioned with the bottoms of all the single batteries, so that all the first through holes 6 are in one-to-one correspondence with all the second through holes 7, and the projection of all the second through holes 7 on the bottoms of all the single batteries is ensured to completely cover the corresponding first through holes 6; extending the welding head from the bottom open end 8 of the first hollow box body 3 to the edge part of the second through holes 7, and sealing and welding the edges of each second through hole 7 with the lower cover plate 24 of the corresponding single battery 1; so that the first through holes 6 of the individual battery cells 1 are communicated with the corresponding second through holes 7; the first cover plate 4 is welded on the bottom open end 8 of the first hollow box body 3 in a sealing way. Wherein the second step and the third step are not sequential. And finally, injecting electrolyte into the inner cavity through the liquid injection port. Other two assembly schemes similar to those of example 1 may also be employed. Note that, in the case where the liquid is not injected, the liquid injection port formed in each unit cell or in the first hollow member 2 needs to be sealed by a plug. In addition, before electrolyte is injected into the inner cavity, the environment of the inner cavity needs to be ensured to be the environment with dew point standard of-25 to 40 ℃, humidity of less than or equal to 1 percent, temperature of 23+/-2 ℃ and cleanliness of 10 ten thousand grades. The inner cavity can reach the environmental standard by vacuumizing before liquid injection.

In the first step, electrolyte can be directly injected into the spare single battery, and the first through hole and the third through hole are respectively sealed by using a sealing component; and separating a plurality of single batteries meeting the requirements. After the first hollow member, the second hollow member and each single battery are welded, the sealing assembly is opened under the action of external force or electrolyte, so that the first through hole 6 is communicated with the corresponding second through hole 7, and the third through hole 14 is communicated with the corresponding fourth through hole 15.

During assembly, the first hollow components can be welded on each lower cover plate, so that the first through holes on each lower cover plate are communicated with the corresponding second through holes; then, each cylinder is welded on the corresponding lower cover plate, and then is filled into the battery cell assembly, and the upper cover plate is welded; and then welding the second hollow member on the upper cover plate, enabling the third through hole to be communicated with the corresponding fourth through hole, and finally injecting electrolyte into the inner cavities of all the single batteries through the first hollow member to form the battery.

According to the scheme, the second hollow member does not need to be inserted, the coaxial insertion problem is not needed to be considered in the arrangement direction of the single battery, all the third through holes 14 are located on the same plane as much as possible, all the fourth through holes 15 are located on the same plane as much as possible, all the first through holes 6 are located on the same plane as much as possible, all the second through holes 7 are located on the same plane as much as possible, and the concentricity of the third through holes 14, the fourth through holes 15, the first through holes 6 and the second through holes 7 is not needed to be considered; the consistency of the first through hole 6, the second through hole 7, the third through hole 14 and the fourth through hole 15 is not required to be considered, the requirements on the machining precision and the assembly precision are low, and the influence of the machining precision and the assembly precision on the product yield is weakened; meanwhile, a special tool is not needed, and the assembly process is simpler; and during welding, the welding head stretches into from the open end 8, no shielding is caused, the welding between the edge of the fourth through hole 15 and the top of each single battery and between the edge of the second through hole 7 and the bottom of each single battery can be completed at one time, the process is simple, the sealing effect is good, and batch production can be realized.

The third scheme is that the second hollow member 10 comprises a hollow box body with a rectangular cross section, wherein the hollow box body is of a split structure and is composed of a second hollow box body 11 with an open end 8 at the top and a second cover plate 12 for covering the open end 8; a fourth through hole 15 is formed in the second hollow box 11; the third through hole 14 and the fourth through hole 15 are penetrated by a third hollow member 16. The caliber of the fourth through hole 15 needs to be slightly larger than the caliber of the connecting end of the third hollow member 16 and the fourth through hole 15 so that the third hollow member 16 can be inserted into the fourth through hole 15.

During assembly, firstly, the cylinder body and the upper cover plate 23 are welded, the battery cell assembly is assembled, and then the lower cover plate 24 is welded, so that the assembly of the spare single battery is completed; secondly, the second hollow box 11 is positioned with the top of each spare battery cell, so that each third through hole 14 corresponds to each fourth through hole 15 one by one, each third hollow member 16 corresponds to each fourth through hole 15 one by one, and each third hollow member 16 is ensured to be inserted into the fourth through hole 15; extending the welding head from the top open end 8 of the second hollow box 11 to the edge part of the fourth through hole 15, and welding the edge of each fourth through hole 15 with the outer wall of the corresponding third hollow member 16 to realize sealing; when the end face of the third hollow member 16 is flush with the inner bottom surface of the second hollow box body, the edge of the fourth through hole 15 can be directly welded with the end face of the corresponding third hollow member 16 to realize sealing; so that the third through holes 14 of each spare battery cell are communicated with the corresponding fourth through holes 15; a second cover plate 12 is sealingly welded to the second hollow box top open end 8 as shown in fig. 10. Thirdly, positioning the top 5 of the first hollow box body and the bottoms of all the single batteries so that all the first through holes 6 are in one-to-one correspondence with all the second through holes 7, and ensuring that the projection of each second through hole 7 on the bottom of each single battery completely covers the corresponding first through hole 6; extending the welding head from the bottom open end 8 of the first hollow box body 3 to the edge part of the second through holes 7, and sealing and welding the edges of each second through hole 7 with the lower cover plate 24 of the corresponding single battery 1; so that the first through holes 6 of the individual battery cells 1 are communicated with the corresponding second through holes 7; the first cover plate 4 is welded on the bottom open end 8 of the first hollow box body 3 in a sealing way. Wherein the second step and the third step are not sequential. Finally, the electrolyte is injected into the inner cavity after being vacuumized through the liquid injection port.

According to the scheme, the second hollow member is not required to be inserted, the problem of coaxial insertion is not required to be considered in the arrangement direction of the single batteries, the caliber of one end of the third hollow member 16 matched with the fourth through hole 15 is only required to be smaller than that of the fourth through hole 15, the third hollow member 16 can be inserted into the fourth through hole 15, the tightness between the third hollow member 16 and the fourth through hole 15 is not required, and the second hollow member and the fourth through hole 15 are sealed through welding, so that the concentricity requirements on the third hollow member 16 and the fourth through hole 15 are not high, the requirements on the machining precision and the assembly precision are lower, and the influence of the machining precision and the assembly precision on the product yield is weakened; meanwhile, a special tool is not needed, and the assembly process is simpler; and during welding, the welding head stretches into from the open end 8, is not shielded, can finish the welding of the edge of the second through hole 7 and the side wall or the end face of the third hollow member 16 at one time, has simple process and good sealing effect, and can realize batch production.

And when the dimension of each single battery in the height direction is different due to processing errors, if the lower cover plates of all the single batteries are positioned on the same plane, and therefore the upper cover plates of all the single batteries cannot be kept on the same plane, the third through holes and the fourth through holes are communicated through the third hollow member, and the height difference between all the upper cover plates can be compensated in the height direction by the third hollow member.

By comparing and analyzing the schemes, the structure and the assembly method of the scheme II and the scheme III are selected in the embodiment.

In this embodiment, the exhaust valve is further disposed on the second hollow member 10, and the exhaust valve can be opened manually or automatically at regular intervals, and the gas in the gas area in each unit cell 1 can be exhausted through the second hollow member 10 and the exhaust valve, so as to further improve the safety performance of the large-capacity battery.

Example 3

Unlike embodiment 1, as shown in fig. 11, the unit cell 1 of this embodiment includes a housing 21 and a finished battery 20 (the finished battery 20 herein includes a finished square battery or a plurality of parallel soft pack batteries), the finished battery 20 is mounted inside the housing 21, and a fifth through hole 22 is provided at the bottom of the finished battery 20; the first through hole 6 is provided at the bottom of the housing 21, and the first through hole 6 communicates with the fifth through hole 22.

The first hollow member 2 of this embodiment has the same structure as that of embodiment 1, but the assembly modes thereof are slightly different based on the difference of the structure of the single battery 1, mainly in that the assembly modes of the single battery 1 and the subsequent liquid injection process are different, and the following three modes can be adopted:

1) When assembling, first, a fifth through hole 22 is opened at the bottom of the housing of the finished battery 20, and then the fifth through hole 22 is sealed by a sealing assembly for standby. Preferably, the fifth through hole 22 is opened and sealed by a sealing component under the environment that the dew point is between 25 ℃ below zero and 40 ℃ below zero and the humidity is less than or equal to 1 percent, the temperature is 23+/-2 ℃, and the cleanliness is 10 ten thousand grades. Next, the finished battery 20 after the above-described treatment is assembled into the case 21 such that the fifth through-hole 22 having the seal assembly corresponds to the first through-hole 6, and after the seal assembly is surely opened, the fifth through-hole 22 is penetrated through the first through-hole 6 to form the unit battery 1. Secondly, positioning the top 5 of the first hollow box body and the bottoms of all the single batteries so that all the first through holes 6 and all the second through holes 7 are in one-to-one correspondence, and ensuring that the projection of all the second through holes 7 on the bottoms of all the single batteries completely covers the corresponding first through holes 6; extending the welding head from the bottom open end 8 of the first hollow box body 3 to the edge part of the second through holes 7, and sealing and welding the edges of each second through hole 7 with the lower cover plate 24 of the corresponding single battery 1; so that the first through holes 6 of the individual battery cells 1 are communicated with the corresponding second through holes 7; the first cover plate 4 is welded on the bottom open end 8 of the first hollow box body 3 in a sealing way. Finally, vacuumizing under nitrogen atmosphere or inert gas atmosphere, opening the sealing assembly by using external force or electrolyte, and injecting the electrolyte into the inner cavity through the liquid injection port. The sealing assembly may be the one disclosed in chinese patent CN218525645U, CN 218525614U.

2) Unlike in scheme 1, the unit cell 1 is assembled by the following process: firstly, fixing a sealing assembly on a first through hole 6, and sealing the first through hole 6; secondly, a fifth through hole 22 is formed at the bottom of the finished battery 20, and the fifth through hole 22 is preferably formed in an environment with the dew point standard of-25 to 40 ℃ and the humidity of less than or equal to 1 percent, the temperature of 23+/-2 ℃ and the cleanliness of 10 ten thousand grades; finally, the finished battery 20 with the fifth through hole 22 is assembled into the shell 21 under the environment that the dew point standard is between minus 25 ℃ and 40 ℃ and the humidity is less than or equal to 1%, the temperature is 23+/-2 ℃ and the cleanliness is 10 ten thousand grades, so that the fifth through hole 22 corresponds to the first through hole 6, and after the sealing assembly is opened, the fifth through hole 22 is communicated with the first through hole 6 to form the single battery 1.

3) First, the first hollow members 2 are fixed at the bottoms of the shells, so that the first through holes 6 and the second through holes 7 are in one-to-one correspondence; the outer shell is understood to be an outer shell with an open top, and after the spare finished batteries are filled in the outer shells, the open top of the outer shell is sealed, so that the outer shells of the single batteries are welded; the standby finished battery is obtained through the following steps: separating the capacity, and screening a plurality of finished batteries meeting the requirements; a fifth through hole 23 is formed in the bottom of the screened finished battery; finally, the sealing assembly sealed at the first through hole 5, the second through hole 6 or the fifth through hole 22 is opened by an external force or the electrolyte itself so that the inner cavities of the respective unit cells and the first hollow member 2 are penetrated.

Example 4

Unlike embodiment 2, the unit cell 1 of this embodiment includes a housing 21 and a finished battery 20 (the finished battery 20 includes a finished square battery or a plurality of parallel soft pack batteries), the finished battery 20 is mounted inside the housing 21, a fifth through hole 22 is provided at the bottom of the finished battery 20, and a sixth through hole (the sixth through hole is not shown in fig. 11) is provided at the top of the finished battery 20. The first through hole 6 is provided at the bottom of the housing 21, and the first through hole 6 communicates with the fifth through hole 22; the third through hole 14 is provided at the top of the housing 21, and the third through hole 14 communicates with the sixth through hole.

The first hollow member 2 and the second hollow member 10 of this embodiment have the same structure as that of embodiment 2, but the assembly modes thereof are slightly different based on the difference in the structure of the single battery 1, mainly in that the assembly of the single battery 1 and the subsequent liquid injection process are different, and the assembly modes can adopt the following three modes:

1) During assembly, first, a fifth through hole 22 is formed in the bottom of the finished battery 20, a sixth through hole is formed in the top of the finished battery, and the first sealing component and the second sealing component are used for sealing the fifth through hole 22 and the sixth through hole for later use. Preferably, the fifth through hole 22 and the sixth through hole are arranged in the environment with the dew point standard of-25 to 40 ℃ and the humidity of less than or equal to 1 percent, the temperature of 23+/-2 ℃ and the cleanliness of 10 ten thousand grades, and the environment is sealed by using corresponding sealing components. Next, the finished battery 20 after the above-described treatment is assembled into the case 21 such that the fifth through-hole 22 having the first seal assembly corresponds to the first through-hole 6, the sixth through-hole having the second seal assembly corresponds to the third through-hole 14, and after the seal assembly is surely opened, the sixth through-hole is penetrated through the third through-hole 14 to form the unit battery 1. Second, the first hollow member 2 and the second hollow member 10 were fixed to the bottom and top of each unit cell, respectively, according to the assembly method in embodiment 2. Finally, vacuumizing under nitrogen atmosphere or inert gas atmosphere, opening the first sealing assembly and the second sealing assembly by using external force, and injecting electrolyte into the inner cavity through the liquid injection port.

2) This solution differs from solution 1) in that the assembly of the battery cells 1 is maintained and the rest of the process is consistent. The unit cell 1 is assembled as follows: fixing the first sealing assembly to the first through hole 6, and sealing the first through hole 6; fixing the second sealing member to the third through hole 14, sealing the third through hole 14; secondly, a fifth through hole 22 is formed at the bottom of the finished battery 20, and a sixth through hole is formed at the top of the finished battery, preferably in an environment with the dew point standard of-25 to 40 ℃ and the humidity of less than or equal to 1 percent, the temperature of 23+/-2 ℃ and the cleanliness of 10 ten thousand grades; finally, the finished battery 20 with the fifth through hole 22 and the sixth through hole is assembled inside the shell 21 under the environment that the dew point standard is-25-40 ℃ and the humidity is less than or equal to 1 percent, the temperature is 23+/-2 ℃ and the cleanliness is 10 ten thousand grades, so that the fifth through hole 22 corresponds to the first through hole 6, the sixth through hole corresponds to the third through hole 14, and after the sealing assembly is opened, the fifth through hole 22 is communicated with the first through hole 6, and the sixth through hole is communicated with the third through hole 14 to form the single battery 1.

3) First, the first hollow members 2 are fixed at the bottoms of the shells, so that the first through holes 6 and the second through holes 7 are in one-to-one correspondence; the outer shell is understood to be an outer shell with an open top, and after the spare finished batteries are filled in the outer shells, the open top of the outer shell is sealed, so that the outer shells of the single batteries are welded; the standby finished battery is obtained through the following steps: separating the capacity, and screening a plurality of finished batteries meeting the requirements; a fifth through hole 23 is formed in the bottom of the screened finished battery; finally, the second hollow members 3 are fixed at the top of each housing, and the first sealing assembly sealed at the first through hole 5, the second through hole 6 or the fifth through hole is opened by external force or electrolyte itself, and the second sealing assembly sealed at the third through hole, the fourth through hole or the sixth through hole is opened, so that each single battery inner cavity is communicated with the first hollow members and the second hollow members.

Example 5

Unlike embodiment 1, the battery cell 1 of this embodiment is a commercially available finished square-shell battery 20, and the structure of the first hollow member 2 of this embodiment is the same as that of embodiment 1, but based on the different structure of the battery cell 1, the assembly mode and the subsequent liquid injection process are slightly different:

when assembling, first, forming a first through hole 6 at the bottom of the finished square shell battery 20, and preferably, opening the first through hole 6 in an environment with the dew point standard of-25 to 40 ℃ and the humidity of less than or equal to 1 percent, the temperature of 23+/-2 ℃ and the cleanliness of 10 ten thousand grades; and sealed with a sealing assembly. This embodiment may alternatively be implemented with a sealing plug 19 as shown in fig. 12.

Secondly, positioning the top 5 of the first hollow box body and the bottoms of all the single batteries so that all the first through holes 6 and all the second through holes 7 are in one-to-one correspondence, and ensuring that the projection of all the second through holes 7 on the bottoms of all the single batteries completely covers the corresponding first through holes 6; extending the welding head from the open end 8 at the bottom of the hollow box body into the edge part of the second through holes 7, and sealing and welding the edges of the second through holes 7 with the lower cover plates 24 of the corresponding single batteries 1; so that the first through holes 6 of the individual battery cells 1 are communicated with the corresponding second through holes 7; the first cover plate 4 is welded on the bottom open end 8 of the first hollow box body 3 in a sealing way. Finally, vacuumizing under nitrogen atmosphere or inert gas atmosphere, opening the sealing assembly by using external force or electrolyte, and injecting the electrolyte into the inner cavity through the liquid injection port. As in the present embodiment, the sealing plugs 19 can be opened in sequence by pulling the pulling rope previously provided to connect all the sealing plugs 19.

Example 6

Unlike example 2, the battery cell 1 of this example is a commercially available finished square-shell battery 20, and the structures of the first hollow member 2 and the second hollow member 10 of this example are the same as those of example 2, but the assembly method and the subsequent liquid injection process are slightly different based on the different structures of the battery cell 1:

when the battery is assembled, first, a first through hole 6 is formed at the bottom of the finished battery 20, and a third through hole 14 is formed at the top of the finished battery, preferably, the finished battery is opened in an environment with the dew point standard of-25 to 40 ℃ and the humidity of less than or equal to 1 percent, the temperature of 23+/-2 ℃ and the cleanliness of 10 ten thousand grades; and sealed with a corresponding seal assembly.

Second, the first hollow member 2 and the second hollow member 10 were fixed to the bottom and top of each unit cell, respectively, according to the assembly method in embodiment 2. Finally, vacuumizing under nitrogen atmosphere or inert gas atmosphere, opening the sealing assembly by using external force or electrolyte, and injecting the electrolyte into the inner cavity through the liquid injection port.

Claims

1. A high capacity battery characterized by: comprises a first hollow component (2) and a plurality of unit batteries (1) which are connected in parallel; each inner cavity of the single battery (1) comprises an electrolyte area and a gas area;

the first hollow member (2) comprises a first hollow box body (3) with an open bottom and a first cover plate (4) for covering the open bottom; the first hollow member (2) extends along the arrangement direction of the plurality of single batteries (1), is fixed at the bottom of each single battery through the top (5) of the first hollow box body and is communicated with the inner cavities of the single batteries (1), and the electrolyte areas of the single batteries (1) are communicated through the first hollow member (2).

2. The high-capacity battery according to claim 1, wherein: the bottom of the shell of each single battery (1) is provided with a first through hole (6); second through holes (7) which are in one-to-one correspondence with and penetrate through the first through holes (6) of the single batteries (1) are formed in the top (5) of the first hollow box body.

3. The high-capacity battery according to claim 2, wherein: orthographic projection of the second through holes (7) at the bottom of each single battery completely covers the corresponding first through holes (6); the edges of the second through holes (7) are welded with the bottoms of the corresponding single batteries (1) in a sealing way; so that the first through holes (6) of the individual single batteries (1) are communicated with the corresponding second through holes (7).

4. A high-capacity battery as claimed in claim 3, wherein: one end of the first hollow component (2) is provided with a liquid injection port (17); the other end is provided with a explosion venting membrane.

5. The high-capacity battery as claimed in claim 4, wherein: a plurality of positioning grooves (9) are formed in the top (5) of the first hollow box body, and all the single batteries (1) are clamped into the corresponding positioning grooves (9) to position the first hollow box body (3) at the bottoms of all the single batteries.

6. The large-capacity battery according to any one of claims 1 to 5, wherein: further comprising a second hollow member (10); the second hollow member (10) comprises a second hollow box (11) with an open top and a second cover plate (12) for covering the open top; the second hollow member (10) extends along the arrangement direction of the plurality of single batteries (1), is fixed at the top of each single battery through the bottom (13) of the second hollow box and is communicated with the inner cavity of each single battery (1), and the gas areas of each single battery (1) are communicated through the second hollow member (10).

7. The high-capacity battery as claimed in claim 6, wherein: the top of the shell of each single battery (1) is provided with a third through hole (14); the second hollow member (10) is provided with fourth through holes (15) which are in one-to-one correspondence with the third through holes (14) of the single batteries (1) and are communicated with each other.

8. The high-capacity battery as claimed in claim 7, wherein: orthographic projection of the fourth through hole (15) on the top of each single battery completely covers the corresponding third through hole (14);

the edge of the fourth through hole (15) is welded with the top of the corresponding single battery (1) in a sealing way; so that the third through holes (14) of the single batteries (1) are communicated with the corresponding fourth through holes (15).

9. The high-capacity battery as claimed in claim 7, wherein: further comprising a third hollow member (16); the third through hole (14) is communicated with the fourth through hole (15) through a third hollow member (16);

the edge of the fourth through hole (15) is welded with the outer wall of the corresponding third hollow component (16) to realize sealing.

10. The high-capacity battery as claimed in claim 6, wherein: an exhaust valve is arranged on the second hollow component (10).