CN220324577U - High-capacity battery, single battery cover plate and single battery - Google Patents

Abstract

The utility model belongs to the field of batteries, and particularly relates to a high-capacity battery, a single battery cover plate and a single battery. The problem that the existing high-capacity battery sharing pipeline component or the air channel is difficult to assemble is solved. Comprises n single batteries, at least n flexible connecting branch pipes and at least one hollow pipe; wherein n is an integer greater than 1; the single battery comprises a cover plate, wherein the cover plate comprises a cover plate main body; the cover plate main body is provided with a first through hole; the n flexible connecting branch pipes are in one-to-one correspondence with the n single batteries and are communicated with the first through holes; one end of each flexible connection branch pipe is connected with the corresponding single battery cover plate respectively, and the other end of each flexible connection branch pipe is connected with the hollow pipe. The hollow pipe does not need to be spliced, the problem of splicing coaxiality is not needed to be considered, and the requirements on machining 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, single battery cover plate and single battery

Technical Field

The utility model belongs to the field of batteries, and particularly relates to a high-capacity battery, a single battery cover plate and a single battery.

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).

However, in the existing large-capacity battery, each single battery has a difference, and due to the existence of the barrel effect, the single battery with the worst performance is often affected, so that the upper limit of the capacity and the cycle number of the whole large-capacity battery are extremely limited. Therefore, how to improve the uniformity of each single battery in the large-capacity battery becomes an important point and a difficult point of research in the field.

In order to solve the above-mentioned problems, the prior art proposes a high-capacity battery, as shown in fig. 1, including a battery pack body formed by connecting a plurality of unit cells in parallel and an electrolyte sharing pipe assembly located at the bottom of the battery pack body; the electrolyte sharing pipeline component is communicated with the electrolyte areas of the inner cavities of the single batteries, the single batteries can be in a unified electrolyte environment through the electrolyte sharing cavity, the uniformity of the electrolyte in the single batteries is ensured, and the performance and the cycle life of the high-capacity battery are 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 line assembly requires the sub-lines 01 and the intermediate connection pipe 02 to be coaxial during the plugging process, so that effective connection can be achieved, however, the coaxiality of the sub-lines and the intermediate connection 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.

For another example, chinese patent CN 115411422A discloses a high-capacity battery, which includes a battery cell group, as shown in fig. 2, a casing of the battery cell is provided with a conduit 04 protruding from a casing body (the conduit 04 is communicated with an inner cavity of a single battery through a through hole formed in the casing of the single battery), and a collecting pipe 05 is provided with a plurality of through holes 06, and when the battery cell group is formed, the conduit 04 is connected with the collecting pipe 05 in a sealing manner through the through holes 06; the conduit 04 and the collecting pipe 05 form a gas path channel of the battery cell group, and at least one end of the collecting pipe 05 is provided with a smoke outlet. When thermal runaway happens to any cell in the cell group, the thermal runaway flue gas is discharged into the collecting pipe 05 through the guide pipe 04 and the through hole 06, and then the thermal runaway flue gas is discharged to a designated place for treatment through a flue gas outlet arranged on the collecting pipe 05.

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

Disclosure of Invention

The utility model aims to provide a high-capacity battery, a single battery cover plate and a single battery, and solves the problem that an existing high-capacity battery sharing pipeline component or an air channel is difficult to assemble.

The technical scheme of the utility model is to provide a high-capacity battery, which is characterized in that: comprises n single batteries, at least n flexible connecting branch pipes and at least one hollow pipe; wherein n is an integer greater than 1;

the single battery comprises a cover plate, wherein the cover plate comprises a cover plate main body; the cover plate main body is provided with a first through hole;

the n flexible connecting branch pipes are in one-to-one correspondence with the n single batteries and are communicated with the first through holes; one end of each flexible connection branch pipe is connected with the corresponding single battery cover plate respectively, and the other end of each flexible connection branch pipe is connected with the hollow pipe.

Further, the cover plate further comprises a first hollow member; the first hollow member is communicated with the first through hole and is in sealing connection with the cover plate main body;

one end of each flexible connecting branch pipe is welded with the first hollow component, and the flexible connecting branch pipes are respectively communicated with the first through holes on the corresponding single battery cover plates through the first hollow component.

Further, the cover plate further comprises a switching component; the switching component is fixed at the top end of the first hollow component;

the switching component comprises an end cover, a second hollow member and a loose joint nut;

the end cover is fixed at the top end of the first hollow component, and a second through hole which is communicated with the first through hole is formed in the end cover;

the second hollow member is fixed on the end cover, and is communicated with the second through hole and coaxial with the second through hole; the outer side of the top end of the second hollow member is provided with a first annular member;

a second annular component is arranged on the inner side of the bottom end of the loose joint nut; the loose joint nut is sleeved on the outer wall of the second hollow member, can move along the axial direction of the second hollow member, and realizes axial limit through the cooperation of the second annular member and the first annular member;

one end of each flexible connection branch pipe is respectively in threaded connection with the loose joint nut on the corresponding single battery cover plate, and is respectively communicated with the first through hole on the corresponding single battery cover plate through the switching component and the first hollow component.

Further, the cover plate further comprises a third hollow member and a duckbill valve; the third hollow component is coaxially sleeved outside the first hollow component, and a duckbill valve installation space is formed between the third hollow component and the first hollow component; the duckbill valve sleeve is arranged on the first hollow component;

the adapter assembly is fixed at the top end of the third hollow component.

Further, sealing gaskets made of red copper, aluminum or mica are arranged in the loose joint nut and at the top end of the second hollow member.

Further, a fourth annular member is arranged outside the bottom end of the third hollow member, and the fourth annular member is fixed with the cover plate main body; and a fifth annular member is arranged on the inner side of the top end of the third hollow member, and is fixed with the end cover of the switching assembly.

Further, the number of the flexible connecting branch pipes is 2n, and the number of the hollow pipes is 2;

one end of each of the n flexible connecting branch pipes is communicated with a first through hole on one cover plate of the corresponding single battery, and the other end of each of the n flexible connecting branch pipes is welded with one of the hollow pipes;

in addition, one ends of the n flexible connecting branch pipes are respectively communicated with a first through hole on the other cover plate of the corresponding single battery, and the other ends of the n flexible connecting branch pipes are welded with the other hollow pipe.

Further, the flexible connecting branch pipe is a stainless steel corrugated pipe.

Further, one end of each flexible connection branch pipe is in threaded connection with the corresponding single battery cover plate, and the other end of each flexible connection branch pipe is in threaded connection with the hollow pipe.

Further, the high-capacity battery further comprises an electrolyte storage bin; at least one hollow tube is positioned at the top of each single battery and the electrolyte storage bin, one end of the hollow tube stretches into the electrolyte storage bin, and the other end stretches into the single battery farthest from the electrolyte storage bin.

The utility model also provides a single battery cover plate, which is characterized in that: comprising any one of the above cover plates.

The utility model also provides a single battery, which is characterized in that: the battery pack comprises a shell, wherein the shell is composed of a cylinder body with two open ends, and an upper cover plate and a lower cover plate which are respectively used for sealing the two open ends of the cylinder body, and at least one of the upper cover plate and the lower cover plate is the single battery cover plate.

The beneficial effects of the utility model are as follows:

1. according to the utility model, the inner cavities of the single battery shells are communicated with the hollow pipe by utilizing the flexible connecting branch pipes, and the hollow pipe can be used as an electrolyte sharing pipeline component, so that the electrolyte of each single battery can be shared to ensure the consistency of each single battery, can also be used as a gas sharing pipeline component, so that the gas areas of each single battery are communicated to achieve gas balance, can also be used as a explosion venting channel, and when the explosion venting film at the gas port of any single battery is broken by the inner cavity flue gas, the flue gas in the inner cavity of the single battery is discharged through the hollow pipe, so that the safety of the high-capacity battery is improved.

According to the utility model, the hollow pipe 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 machining 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.

In addition, because the flexible connecting branch pipe has great flexibility, the angle of the flexible connecting branch pipe can be adjusted, shielding of the hollow pipe on the welding position or interference of the butt welding joint can be avoided, and the welding and mounting difficulty of the two ends of the flexible connecting branch pipe is greatly reduced.

2. According to the utility model, the switching assembly is additionally arranged between the first hollow member and the flexible connecting branch pipe, and the flexible connecting branch pipe is in threaded connection with the switching assembly, so that the connection difficulty of the flexible connecting branch pipe and the first hollow member is further reduced.

3. According to the utility model, the sealing gasket is additionally arranged at the top end of the second hollow component, so that the sealing reliability of the connection part of the flexible connection branch pipe and the switching component is improved, and the sealing gasket made of red copper, aluminum or mica is selected, so that the sealing is reliable, durable and stable, and the aging phenomenon is avoided.

4. If the hollow pipe is used as an explosion venting channel, the duckbill valve can be sleeved on the first hollow component, and after the flexible connecting branch pipe, the loose joint nut and the hollow pipe are connected, the tightness of the communicating pipeline can be tested by pressing. Because of the duckbill valve, the compression test does not affect the inside of the battery. If the two ends of the flexible connection branch pipe are connected with leakage, the flexible connection branch pipe can be repaired. And after the tightness test is qualified, the joint of the flexible connecting branch pipe and the inner and outer wires locked by the threads of the loose joint nut can be spot welded by cold welding or argon arc welding, and the whole communication system is solidified.

Drawings

Fig. 1 is a schematic view of a high-capacity battery according to the prior art;

FIG. 2 is a schematic view of another prior art high-capacity battery structure;

FIG. 3 is a schematic structural view of a cover plate of embodiment 1;

FIG. 4 is a schematic view of the cover plate of embodiment 1 from another view;

FIG. 5 is a schematic view showing the structure of the cover plate of embodiment 1 as an upper cover plate;

FIG. 6 is a schematic view showing a partial structure of a cover plate of embodiment 2;

FIG. 7 is a schematic view of a partial explosion structure of a cover plate of example 2;

FIG. 8 is a cross-sectional view of the adapter assembly of example 2;

FIG. 9 is a schematic view showing a partial structure of a cover plate of embodiment 3;

fig. 10 is a schematic diagram of the structure of a single cell of the first structure in embodiment 4;

fig. 11 is a schematic diagram of a cell structure of a second structure in embodiment 4;

fig. 12 is a schematic structural diagram of a single cell of the third structure in embodiment 4;

fig. 13 is a schematic structural diagram of a single cell of the fourth structure in embodiment 4;

fig. 14 is a schematic structural diagram of a battery cell according to a fifth structure in embodiment 4;

fig. 15 is a schematic view showing the structure of a large-capacity battery according to example 6;

fig. 16 is a schematic view showing the structure of a large-capacity battery according to embodiment 7;

FIG. 17 is a schematic view showing the structure of a flexible connecting branch pipe in embodiment 7;

fig. 18 is a schematic view showing the structure of a large-capacity battery according to embodiment 8;

fig. 19 is a schematic view showing another structure of a large-capacity battery according to embodiment 8;

fig. 20 is a schematic view of the structure of a large-capacity battery according to example 9.

The reference numerals in the drawings are:

1. a cover plate main body; 2. a first step surface; 3. a first through hole; 4. a pole avoiding hole; 5. a first hollow member; 6. a switching component; 61. an end cap; 62. a second hollow member; 621. a first annular member; 63. a loose joint nut; 631. a second annular member; 632. a screw connection part; 64. a second step surface; 7. a third hollow member; 71. a fourth annular member; 72. a fifth annular member; 8. a duckbill valve; 9. a flexible connecting branch pipe; 10. a hollow tube.

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, etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

Example 1

The embodiment provides a cover plate suitable for a square-shell battery, wherein the square-shell battery comprises an upper cover plate, a lower cover plate, a cylinder body and a battery cell assembly; the cell assembly may 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 cell assembly described herein may also be a commercially available shell battery; the upper cover plate, the cylinder body and the lower cover plate form a square shell battery shell, and the battery core assembly is arranged in the single battery shell.

The cover plate provided by the embodiment can be used as an upper cover plate or a lower cover plate of the square shell battery.

As shown in fig. 3, the cover plate comprises a flat cover plate main body 1, the shape of the flat cover plate main body is matched with that of the open end of the cylinder, the area of the flat cover plate main body can be slightly larger than that of the open end of the cylinder, and the flat cover plate main body is fixed at the open end of the cylinder in a fusion welding mode; the fixing of the cover plate main body 1 can be realized by arranging the first step surface 2 (see fig. 4) around the cover plate main body 1 in a fusion welding mode, the first step surface 2 can also be used as a positioning surface, and the end plate can be positioned at the open end of the cylinder body by using the positioning surface and then fixed in a fusion welding mode. The area of the cover plate main body 1 can be slightly smaller than the area of the open end of the cylinder, and the cover plate main body is fixed at the open end of the cylinder in a caulking manner. The cover plate main body 1 is provided with a first through hole 3, and when the cover plate is fixed at the open end of the cylinder body, the first through hole 3 is communicated with the inner cavity of the cylinder body. The position of the first through hole 3 on the cover main body 1 is not limited, but the first through hole 3 may be opened at the center of the cover main body 1 for structural symmetry. When the upper cover plate is used, the size of the first through hole 3 needs to ensure that the gas in the inner cavity of the cylinder is flushed out, and when the lower cover plate is used, the size of the first through hole 3 needs to ensure that the electrolyte in the inner cavity of the cylinder flows out or the external electrolyte can enter the inner cavity of the cylinder. It should be noted that, as shown in fig. 5, when the cover plate is used as the upper cover plate, the pole avoidance hole 4 is further required to be added on the cover plate, so that the pole of the battery cell assembly extends out.

As can be seen from fig. 3, the cover plate of the present embodiment further includes a first hollow member 5, and the first hollow member 5 is fixed to the cover plate body 1 and is communicated with the first through hole 3. In order to facilitate processing, reduce processing cost, and improve sealing reliability of the first hollow member 5 and the cover plate body, in this embodiment, the inner diameter of the first hollow member 5 is equal to the diameter of the first through hole 3, and an integral molding process may be adopted to process the cover plate main body 1 and the first hollow member 5 into an integral piece.

In other embodiments, the inner diameter of the first hollow member 5 may be larger than the diameter of the first through hole 3, the first hollow member 5 and the first through hole 3 may be different from each other, and the first hollow member 5 is fixed on the cover main body 1 by welding.

In other embodiments, the first hollow member 5 and the first through hole 3 may be fixed by bonding, but the connection strength and sealing reliability are weaker than those of welding.

In other embodiments, the cover plate may not be provided with the first hollow member 5.

Example 2

As shown in fig. 6 and 7, in this embodiment, on the basis of embodiment 1, an adapter assembly 6 is fixed to the tip of a first hollow member 5.

As shown in fig. 7 and 8, the adapter component 6 includes an end cover 61, whose shape is adapted to the shape of the open end of the top end of the first hollow member 5, and the area of the adapter component may be slightly larger than the area of the open end of the top end of the first hollow member 5, and the adapter component is fixed to the open end of the top end of the first hollow member 5 by fusion welding; the fixing of the end cover 61 can also be achieved by providing the periphery of the end cover 61 with a second step surface 64, which can also be used as a positioning surface by which the end cover 61 can be positioned at the open end of the top end of the first hollow member 5, and then fixed by fusion welding. The area of the end cap 61 may be slightly smaller than the area of the top open end of the first hollow member 5, and is fixed to the top open end of the first hollow member 5 by caulking. The end cap 61 is provided with a second through hole penetrating the first through hole 3.

The adapter assembly 6 further includes a second hollow member 62 and a union nut 63 attached to the second hollow member 62.

The second hollow member 62 is fixed to the end cap 61 and is coaxial with the second through hole. The outer side of the tip of the second hollow member 62 is provided with a first annular member 621.

The loose-joint nut 63 includes a limiting portion, which is a second annular member 631 disposed inside the bottom end of the loose-joint nut 63, and a threaded portion 632, which is a main body portion of the loose-joint nut 63, and an inner wall of which is provided with an internal thread (not shown in the drawing).

The loose-joint nut 63 is sleeved on the outer wall of the second hollow member 62, the inner annular surface of the second annular member 631 is in clearance fit with the outer wall of the second hollow member 62, the inner surface part of the threaded portion 632 is in clearance fit with the outer annular surface of the first annular member 621, the loose-joint nut 63 can move along the axial direction of the second hollow member 62, and axial limiting is realized through the cooperation of the second annular member 631 and the first annular member 621, so that the loose-joint nut 63 and the second hollow member 62 are always and effectively connected. In the specific assembly, the loose-joint nut 63 may be first sleeved on the outer wall of the second hollow member 62, and then the first annular member 621 may be welded on the outer side of the top end of the second hollow member 62.

In other embodiments, the second hollow member 62 may not be provided with the first annular member 621, and the union nut 63 may be in a sealed connection with the second hollow member 62 by means of a threaded connection.

Example 3

As shown in fig. 9, in this embodiment, on the basis of embodiment 2, a third hollow member 7 and a duckbill valve 8 are added, wherein the third hollow member 7 is sleeved on the periphery of the first hollow member 5, a duckbill valve 8 installation space is formed between the third hollow member 7 and the first hollow member 5, the duckbill valve 8 is fixed on the first hollow member 5, and the adaptor assembly 6 is fixed on the upper end of the third hollow member 7. The duckbill valve 8 may be secured to the first hollow member 5 by heat staking.

In order to facilitate the fixing of the third hollow member 7 to the cover main body 1, a fourth annular member 71 is provided outside the bottom end of the third hollow member 7, and the third hollow member 7 is fixed to the cover main body 1 by the fourth annular member 71, and the fourth hollow member 7 can be fixed by welding, so that the contact area between the bottom end of the fourth annular member 71 and the cover main body 1 is large, and the fourth annular member 71 can be added to improve the connection strength.

Similarly, in order to increase the connection strength between the third hollow member 7 and the adapter unit 6, the fifth annular member 72 is provided inside the distal end of the third hollow member 7, and the fifth annular member 72 is fixed to the adapter unit 6 by welding, so that the contact area between the distal end of the fifth annular member 72 and the cover plate is large with respect to the distal end of the third hollow member 7, and therefore, the connection strength and sealing reliability can be increased by adding the fifth annular member 72.

Example 4

The embodiment provides several types of single batteries with different structures, which comprise an upper cover plate, a lower cover plate, a cylinder body 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 shell, and the battery cell assembly is arranged in the single battery shell.

The lower cover plate of the unit cell of the first structure employs the cover plate of example 1, as shown in fig. 10.

The lower cover plate of the unit cell of the second structure is the cover plate of example 2, as shown in fig. 11.

The upper cover plate of the third structure of the unit cell is the cover plate of example 1, as shown in fig. 12.

The upper cover plate of the fourth structure of the unit cell is the cover plate of example 2, as shown in fig. 13.

The upper cover plate of the fifth structural unit cell employs the cover plate of example 3, as shown in fig. 14.

The sixth structure of the unit cell, the lower cover plate was the cover plate of example 1 or example 2, and the upper cover plate was any one of the cover plates of examples 1 to 3.

In order to ensure the sealability of the battery cell case, if the cover plates in embodiment 1 and embodiment 2 are used as the upper cover plate or the lower cover plate, a sealing assembly is provided on the first hollow member 5 or the second hollow member 62, and the sealing assembly disclosed in chinese patent CN218525645U, CN218525614U may be used, and after a large-capacity battery is formed, the sealing assembly is opened by external force or the electrolyte itself. If the cover plate of example 3 is used as the upper cover plate, the duckbill valve 8 itself has a sealing effect.

Example 5

The present embodiment is different from embodiment 4 in that the cell assembly of the present embodiment is a commercially available case battery.

The lower cover plate of the single battery with the first structure adopts the cover plate in the embodiment 1 or the embodiment 2, the bottom of the battery shell of the commercial shell is provided with a third through hole communicated with the first through hole 3, and the external structure is the same as that of fig. 10 and 11.

The upper cover plate of the unit cell of the second structure is any one of the cover plates of the embodiments 1 to 2, and the top of the commercially available case cell case has a gas port corresponding to the first through hole 3, and the external structure is the same as that of fig. 12 and 13.

Here, the gas port includes the following two meanings:

1) The gas port is a through hole which is directly arranged at the top of the battery shell of the commercial shell and penetrates through the inner cavity of the battery of the commercial shell.

2) The gas port is an explosion venting port or an explosion proof port arranged at the top of the shell of the commercial shell battery, and an explosion venting membrane is arranged at the explosion venting port or the explosion proof port.

The upper cover plate of the third structure is the cover plate in embodiment 3, and the top of the shell of the commercial shell battery is provided with a gas port corresponding to the first through hole 3, and the external structure is the same as that of fig. 14.

The unit cell of the fourth structure, the lower cover plate was the cover plate of example 1 or example 2, and the upper cover plate was any one of the cover plates of examples 1 to 3. A third through hole communicated with the first through hole 3 of the lower cover plate is formed in the bottom of the battery shell of the commercial side shell, and a gas port corresponding to the first through hole 3 of the upper cover plate is formed in the top of the battery shell of the commercial side shell.

In order to ensure the tightness of the single battery case, the following description will be made with respect to the case where the gas port is a through hole that is directly opened at the top of the commercial case battery case and penetrates the inner cavity of the commercial case battery:

when the cover plates of examples 1 and 2 are used as the upper cover plate or the lower cover plate, a sealing assembly is provided on the first hollow member 5 or the second hollow member 62, and the sealing assembly disclosed in chinese patent CN218525645U, CN218525614U may be used, and after a large-capacity battery is formed, the sealing assembly is opened by external force or the electrolyte itself. When the cover plate in example 3 is used as the upper cover plate, the duckbill valve 8 itself has a sealing effect.

When the gas port is a vent port or an explosion vent provided at the top of the commercially available battery case, it is not necessary to provide a seal assembly on the first hollow member 5 or the second hollow member 62 of the upper cover plate.

Example 6

The embodiment provides a high-capacity battery, which comprises 9 parallel single batteries, and the number of the other embodiments can be adjusted according to actual demands. The single battery shown in fig. 10 is adopted, and the cell component can be an electrode component or a commercially available shell battery.

As shown in fig. 15 (in this figure, 4 single cells are taken as an example), the large-capacity battery further comprises flexible connection branch pipes 9 corresponding to the number of the single cells one by one and a hollow pipe 10 communicated with all the flexible connection branch pipes 9, and the inner cavity of the hollow pipe 10 is communicated with the inner cavity of each single cell through the flexible connection branch pipe 9. During the operation of the large-capacity battery, the two ends of the hollow tube 10 should be sealed.

The hollow pipe 10 is communicated with the inner cavities of all the single batteries, so that the electrolyte of all the single batteries is shared to ensure the consistency of all the single batteries, namely, the electrolyte cavities of all the single batteries are communicated, the electrolytes of all the single batteries are in the same system, the difference between the electrolytes of all the single batteries is reduced, the consistency of all the single batteries is improved to a certain extent, and the cycle life of the large-capacity battery is prolonged to a certain extent. In the embodiment, the hollow pipe 10 does not need to be inserted, the coaxial insertion problem is not required to be considered in the arrangement direction of the single batteries, and the requirements on the machining 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.

As can be seen from fig. 15, one end of the flexible connection branch 9 is sealingly connected to the hollow tube 10 and the other end is sealingly connected to the first hollow member 5 of the lower cover plate. A corrugated tube of stainless steel material may be used as the flexible connecting branch pipe 9. Both ends of the flexible connection branch pipe 9 can be in sealing connection with the hollow pipe 10 and the first hollow member 5 in a welding mode, and as the flexible connection branch pipe 9 has great flexibility, in the welding process, shielding of the welding position or interference of the butt welding joint of the hollow pipe 10 can be avoided by adjusting the angle of the flexible connection branch pipe 9, and the welding and mounting difficulty of both ends of the flexible connection branch pipe 9 is greatly reduced.

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.

Example 7

The present embodiment provides a large-capacity battery, which is different from embodiment 6 in that the single battery shown in fig. 11 is adopted in this embodiment, and the cell assembly may be an electrode assembly or a commercially available case battery.

As shown in fig. 16 and 17, one end of the flexible connection branch pipe 9 is in sealing connection with the hollow pipe 10, and the outer wall of the other end of the flexible connection branch pipe 9 is provided with external threads and is in threaded connection with the internal threads of the loose joint nut 63.

In order to improve the sealing reliability between the flexible connection branch pipe 9 and the adapter assembly 6, a sealing gasket made of red copper, aluminum or mica may be installed on the top end of the second hollow member 62 and inside the loose joint nut 63. The sealing gasket is reliable, durable and stable in sealing and free from aging.

Example 8

The present embodiment provides a large-capacity battery, and in contrast to embodiments 6 or 7, the present embodiment uses the unit cell shown in fig. 12 or 13, and the cell assembly may be an electrode assembly or a commercially available case battery.

As shown in fig. 18, the large-capacity battery further includes flexible connection branches 9 corresponding to the number of single batteries one by one and a hollow pipe 10, one end of the flexible connection branch 9 is connected with the first hollow member 5, and the other end is connected with the hollow pipe 10. The structure of the flexible connection branch pipe 9 and the connection manner thereof with the first hollow member 5 and the hollow pipe 10 are the same as those of embodiment 6, and are not described here again.

As shown in fig. 19, one end of the flexible connection branch pipe 9 is connected to the union nut 63, and the other end is connected to the hollow pipe 10. The structure of the flexible connection branch pipe 9 and the connection manner with the union nut 63 and the hollow pipe 10 are the same as those of embodiment 7, and are not described here.

When the inner cavity of the hollow tube 10 is communicated with the inner cavities of all the single batteries through the flexible connecting branch pipes 9, the hollow tube 10 is used as a gas sharing cavity of each single battery, and the gas areas of all the single batteries can be communicated based on the gas cavity to achieve gas balance, so that the gas sharing of all the single batteries ensures the consistency of all the single batteries, and the cycle life of the large-capacity battery is prolonged to a certain extent;

when the gas port is provided with the explosion venting membrane, the hollow tube 10 is used as an explosion venting channel, and when any single battery is in thermal runaway, the explosion venting membrane is broken through the thermal runaway smoke, and the safety of the high-capacity battery can be improved through the hollow tube 10.

In the embodiment, the hollow pipe 10 does not need to be inserted, the coaxial insertion problem is not required to be considered in the arrangement direction of the single batteries, and the requirements on the machining 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.

In other embodiments, when the cover plate is not provided with the first hollow member 5, each flexible connection branch pipe is communicated with the first through hole, and one end of each flexible connection branch pipe is respectively in threaded connection with the corresponding single battery cover plate, and the other end of each flexible connection branch pipe is in threaded connection with the hollow pipe. The inner cavity of the hollow tube 10 is communicated with the inner cavities of all the single batteries through the flexible connecting branch tube 9, and the hollow tube 10 is used as a gas sharing cavity of all the single batteries.

In other embodiments, when the hollow tube 10 is used as a gas sharing chamber of each single battery, the high-capacity battery further comprises an electrolyte storage bin, one end of the hollow tube extends into the electrolyte storage bin, and the other end extends into the single battery farthest from the electrolyte storage bin.

Example 9

The present embodiment provides a large-capacity battery, which is different from embodiment 8 in that the single battery shown in fig. 14 is adopted in the present embodiment, and the cell assembly may be an electrode assembly or a commercially available case battery.

As shown in fig. 20, the large-capacity battery further includes flexible connection branch pipes 9 and a hollow pipe 10, the flexible connection branch pipes 9 and the hollow pipe 10 are in one-to-one correspondence with the number of single batteries, one end of each flexible connection branch pipe 9 is connected with a loose joint nut 63, and the other end is connected with the hollow pipe 10. The structure of the flexible connection branch pipe 9 and the connection manner with the union nut 63 and the hollow pipe 10 are the same as those of embodiment 8, and are not described here again.

In this embodiment, by adding the duckbill valve 8 to the first hollow member 5, air in the external environment can be prevented from entering the inner cavity of the battery housing even if the two ends of the hollow tube 10 are open during the operation of the high-capacity battery. When thermal runaway occurs in any single battery, the duckbill valve 8 is opened under the action of thermal runaway smoke, and the thermal runaway smoke is discharged through the hollow tube 10, so that the safety of the high-capacity battery can be improved.

In addition, after the flexible connection branch pipe 9 is connected with the union nut 63 and the hollow pipe 10, the tightness of the communication pipe can be tested by pressing. Because of the duckbill valve 8, the compression test does not affect the inside of the battery. If there is leakage at the connection parts of the two ends of the flexible connection branch pipe 9, repair can be performed. After the tightness test is qualified, the joint of the flexible connecting branch pipe 9 and the inner and outer wires locked by the threads of the loose joint nut 63 can be spot welded by cold welding or argon arc welding, and the whole communication system is solidified.

Example 10

The present embodiment provides a large-capacity battery, which is different from embodiment 6 to embodiment 9 in that the upper cover plate is the cover plate of embodiment 1 or embodiment 2, the lower cover plate is the single battery of any one of embodiment 1 to embodiment 3, and the cell assembly may be an electrode assembly or a commercially available case battery.

Comprises a plurality of flexible connecting branch pipes 9 and 2 hollow pipes 10;

the hollow tube 10 is connected with the first hollow member 5 or the loose joint nut 63 on the lower cover plate of each single battery through each flexible connection branch pipe 9, and the structure of the specific flexible connection branch pipe 9 and the connection mode of the flexible connection branch pipe 9 and the first hollow member 5 or the loose joint nut 63 can be the same as that of the embodiment 6 or the embodiment 7;

the other hollow tube 10 is connected with the first hollow member 5 or the union nut 63 on the upper cover plate of each unit cell through each flexible connection branch tube 9, and the structure of the specific flexible connection branch tube 9 and the connection manner of the flexible connection branch tube 9 and the first hollow member 5 or the union nut 63 are the same as those of embodiment 8 or embodiment 9.

Claims (12)

1. A high capacity battery characterized by: comprises n single batteries, at least n flexible connecting branch pipes (9) and at least one hollow pipe (10); wherein n is an integer greater than 1;

the single battery comprises a cover plate, wherein the cover plate comprises a cover plate main body (1); a first through hole (3) is formed in the cover plate main body (1);

the n flexible connecting branch pipes (9) are in one-to-one correspondence with the n single batteries and are communicated with the first through holes; one end of each flexible connection branch pipe (9) is connected with a corresponding single battery cover plate respectively, and the other end of each flexible connection branch pipe (9) is connected with a hollow pipe (10).

2. The high-capacity battery according to claim 1, wherein: the cover plate further comprises a first hollow member (5); the first hollow member (5) is communicated with the first through hole (3) and is in sealing connection with the cover plate main body (1);

one end of each flexible connecting branch pipe (9) is connected with the first hollow component (5), and the flexible connecting branch pipes are respectively communicated with the first through holes (3) on the corresponding single battery cover plates through the first hollow component (5).

3. The high-capacity battery according to claim 2, wherein: the cover plate also comprises a switching component (6); the switching component (6) is fixed at the top end of the first hollow component (5);

the adapter assembly (6) comprises an end cover (61), a second hollow member (62) and a loose joint nut (63);

the end cover (61) is fixed at the top end of the first hollow member (5), and a second through hole which is communicated with the first through hole (3) is formed in the end cover (61);

the second hollow member (62) is fixed on the end cover (61), and is communicated with the second through hole and coaxial with the second through hole; a first annular member (621) is provided on the outer side of the tip end of the second hollow member (62);

a second annular component (631) is arranged on the inner side of the bottom end of the loose joint nut (63); the loose joint nut (63) is sleeved on the outer wall of the second hollow member (62), the loose joint nut (63) can move along the axial direction of the second hollow member (62), and the second annular member (631) and the first annular member (621) are matched to realize axial limiting;

one end of each flexible connection branch pipe (9) is respectively in threaded connection with a loose joint nut (63) on the corresponding single battery cover plate, and is respectively communicated with a first through hole (3) on the corresponding single battery cover plate through the switching assembly (6) and the first hollow member (5).

4. A high-capacity battery as claimed in claim 3, wherein: the cover plate further comprises a third hollow member (7) and a duckbill valve (8); the third hollow member (7) is coaxially sleeved outside the first hollow member (5), and a duckbill valve (8) installation space is formed between the third hollow member and the first hollow member (5); the duckbill valve (8) is sleeved on the first hollow member (5);

the switching component (6) is fixed at the top end of the third hollow component (7).

5. The high-capacity battery as claimed in claim 4, wherein: a sealing gasket made of red copper, aluminum or mica is arranged in the loose joint nut (63) and at the top end of the second hollow member (62).

6. The high-capacity battery as claimed in claim 4, wherein: a fourth annular member (71) is arranged outside the bottom end of the third hollow member (7), and the fourth annular member (71) is fixed with the cover plate main body (1); a fifth annular member (72) is arranged on the inner side of the top end of the third hollow member (7), and the fifth annular member (72) is fixed with an end cover (61) of the switching assembly (6).

7. The high-capacity battery according to any one of claims 1 to 6, wherein: 2n flexible connecting branch pipes (9) are arranged, and 2 hollow pipes (10) are arranged;

one end of each of the n flexible connecting branch pipes (9) is respectively communicated with a first through hole on one cover plate of the corresponding single battery, and the other end of each of the n flexible connecting branch pipes is welded with one hollow pipe (10);

in addition, one ends of the n flexible connecting branch pipes (9) are respectively communicated with a first through hole on the other cover plate of the corresponding single battery, and the other ends of the n flexible connecting branch pipes are welded with the other hollow pipe (10).

8. The high-capacity battery according to any one of claims 1 to 6, wherein: the flexible connecting branch pipe (9) is a stainless steel corrugated pipe.

9. The high-capacity battery according to claim 1, wherein: one end of each flexible connection branch pipe (9) is in threaded connection with a corresponding single battery cover plate, and the other end of each flexible connection branch pipe (9) is in threaded connection with the hollow pipe (10).

10. The high-capacity battery according to claim 9, wherein: the electrolyte storage bin is also included; at least one hollow tube (10) is positioned at the top of each single battery and the electrolyte storage bin, one end of the hollow tube (10) stretches into the electrolyte storage bin, and the other end stretches into the single battery farthest from the electrolyte storage bin.

11. The utility model provides a monomer battery apron which characterized in that: comprising a cover plate according to any one of claims 1-10.

12. A single cell, characterized in that: the battery pack comprises a shell, wherein the shell is composed of a cylinder body with two open ends, and an upper cover plate and a lower cover plate which are respectively used for sealing the two open ends of the cylinder body, and at least one of the upper cover plate and the lower cover plate is the battery cover plate of claim 11.