CN221508329U - High-capacity battery and cylinder - Google Patents

Abstract

The utility model belongs to the field of batteries, and particularly relates to a high-capacity battery and a cylinder. The problem that the existing high-capacity battery sharing pipeline assembly is difficult to assemble is solved. Comprises a shell and single batteries arranged in the shell; each single battery cavity comprises an electrolyte area and a gas area; the at least one first side wall of the shell is provided with a liquid supplementing and exchanging component; the liquid supplementing and replacing component is used for supplementing electrolyte into the electrolyte sharing cavity and the inner cavities of the single batteries or replacing the electrolyte in the electrolyte sharing cavity and the inner cavities of the single batteries. According to the utility model, the electrolyte sharing chamber does not need to be inserted, so that the processing difficulty and the processing cost of the high-capacity battery with the sharing system are greatly reduced. According to the utility model, the electrolyte can be supplemented or replaced into the electrolyte sharing chamber and the inner cavities of all the single batteries through the electrolyte supplementing and replacing component, so that the performance of the high-capacity battery is improved.

Description

High-capacity battery and cylinder

Technical Field

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

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).

Chinese patent CN219144456U discloses a high-capacity battery, whose structure is shown in fig. 1, comprising a battery pack main body formed by connecting several single batteries in parallel and a shared pipeline assembly located at the bottom of the battery pack main body; and the shared pipeline component is used for completely penetrating the inner cavities of the plurality of single batteries so that all the single batteries in the large-capacity battery are in an electrolyte system. The high-capacity battery can strengthen the uniformity of electrolyte of each single battery in the high-capacity battery through the shared pipeline assembly, improve the cycle life, supplement electrolyte for the high-capacity battery through the shared pipeline assembly, prolong the service life of the high-capacity battery, and improve the use safety of the high-capacity battery.

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 4, are integrally extruded with the lower cover plate 03 of the single battery, and are communicated with the openings of the lower cover plate 03 of the single battery.

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

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

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

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

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

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

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

Disclosure of utility model

The utility model aims to provide a high-capacity battery and a cylinder body, which solve the problem that the existing high-capacity battery sharing pipeline component is difficult to assemble.

The technical scheme of the utility model is to provide a high-capacity battery, which is characterized in that: comprises a shell and m single batteries arranged in the shell, wherein m is more than 1; each single battery cavity comprises an electrolyte area and a gas area;

Defining the length direction of the shell as the x direction, the width direction as the y direction and the height direction as the z direction;

The shell comprises a cylinder body, an upper cover plate and a lower cover plate, wherein the upper cover plate and the lower cover plate cover the open end of the cylinder body, and the upper cover plate and the lower cover plate are parallel to the xy plane;

The upper cover plate is provided with avoiding holes which can enable the polar terminals of all the single batteries to extend out; the polarity terminals of all the single batteries extend out of the corresponding avoidance holes, and the upper cover plate area around the avoidance holes is fixedly sealed with the single battery shell;

The lower cover plate is provided with an electrolyte sharing chamber which is communicated with the electrolyte areas in the inner cavities of the single batteries;

At least one first side wall of the cylinder is provided with a liquid supplementing and exchanging component, wherein the first side wall is a side wall parallel to the yz plane; the liquid supplementing and replacing component is used for supplementing electrolyte into the electrolyte sharing cavity and the inner cavities of the single batteries or replacing the electrolyte in the electrolyte sharing cavity and the inner cavities of the single batteries.

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

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

In addition, the utility model is provided with the liquid supplementing and replacing component, when the high-capacity battery is charged and discharged for a period of time, the electrolyte is decomposed and consumed to reduce the performance of the high-capacity battery, and the electrolyte can be supplemented into the electrolyte sharing cavity and the inner cavities of all the single batteries through the liquid supplementing and replacing component, so that the performance of the high-capacity battery is improved; or, after the high-capacity battery is charged and discharged for a period of time, the high-capacity battery performance is affected due to the occurrence of impurities in the electrolyte, and the electrolyte sharing chamber and the electrolyte in the inner cavity of each single battery can be replaced by the liquid supplementing and replacing component, so that the high-capacity battery performance is improved. The replacement may be partial or complete. In addition, after the electrolyte areas in the inner cavities of the single batteries are communicated with the electrolyte sharing chamber, electrolyte can be injected into the inner cavities of the single batteries and the electrolyte sharing chamber again through the liquid supplementing and replacing component, so that the continuity of the electrolyte is ensured.

According to the utility model, the first side wall parallel to the yz plane of the cylinder body is provided with the liquid supplementing and exchanging component, so that the operation space is larger, the operation is easy, and the structural stability is high in the liquid supplementing and exchanging process. And when the large-capacity batteries are assembled into the energy storage equipment, the large-capacity batteries are distributed along the width direction (y direction) of the large-capacity batteries, so that the first side wall of each large-capacity battery is exposed, and when the liquid supplementing and replacing component is arranged on the first side wall, liquid supplementing and replacing operation can be conveniently carried out.

Further, an electrolyte circulation channel is arranged on the first side wall;

the liquid supplementing and replacing component comprises a liquid supplementing and replacing component main body and a plugging piece fixed on the liquid supplementing and replacing component main body;

The electrolyte-supplementing member body is provided with a first channel, and two ends of the electrolyte-circulating channel are respectively communicated with the electrolyte-sharing chamber and the first channel of the electrolyte-supplementing member;

The plugging piece is used for plugging the first channel from the outer side of the first side wall, and the plugging piece is used for plugging the first channel in the normal charge-discharge cycle process of the high-capacity battery, so that the overall tightness of the shell is ensured. After the plugging piece is disassembled, the external connecting pipe is inserted into the first channel, and electrolyte is filled into the electrolyte sharing chamber and the inner cavities of all the single batteries, or the state of the electrolyte in the electrolyte sharing chamber and the electrolyte in the inner cavities of all the single batteries is changed.

Further, in order to reduce the material consumption and the material cost of the cylinder, a cavity isolated from the electrolyte flowing channel is formed in the first side wall. After the cavity is formed, the weight of the whole large-capacity battery can be reduced at the same time.

Further, a first blind hole penetrating through the first side wall is formed in the first side wall along the x direction and is used as a mounting hole of the liquid supplementing and replacing component main body;

A second hole penetrating through the first side wall is formed in the first side wall along the z direction and is used as an electrolyte circulation channel;

The liquid supplementing and replacing component body is a column body and is fixed in the first blind hole and seals the first blind hole; the first channel is arranged on the main body of the liquid supplementing and changing component and is communicated with the electrolyte flow channel.

Further, the upper cover plate of the high-capacity battery is provided with a gas chamber; the gas chambers are communicated with the gas areas in the inner cavities of the single batteries. Based on the gas chamber, the gas areas of the single batteries can be communicated to achieve gas balance, so that the gas sharing of the single batteries ensures the consistency of the single batteries, and the cycle life of the high-capacity battery is prolonged to a certain extent.

Further, the first side wall is also provided with a gas circulation channel communicated with the gas chamber;

The main body of the liquid supplementing and replacing component is provided with a second channel which is mutually isolated from the first channel, and two ends of the gas circulation channel are respectively communicated with the gas chamber and the second channel of the liquid supplementing and replacing component; the blocking piece is also used for blocking the second channel from the outer side of the first side wall.

In order to increase the flow area of the second channel, the utility model can also adopt second channels with different sections, or porous structures, and the flow area of the second channel is increased by a special arrangement mode:

For example, an L-shaped channel may be used as the second channel, and the cross section of the horizontal channel of the L-shaped channel is a fan-shaped ring, which is concentric with the first channel, and has a smaller radial dimension requirement for the main body of the fluid replacement component than a circular cross-section channel under the condition of the same flow area.

A plurality of through holes can also be adopted as the horizontal channel of the L-shaped channel, and the through holes are distributed along the same circumference. Similar to the fan-shaped annular channel, the radial dimension requirement on the main body of the liquid supplementing and changing component is smaller than that of the circular-section channel under the condition of the same flow passage area.

Further, the present utility model may employ a plurality of structures of the blocking member for blocking the first passage and the second passage from the outside of the first side wall:

The sealing piece can only comprise a screw cap which is in threaded connection with the main body of the fluid supplementing and changing component, and in order to improve the sealing performance, a sealing ring can be additionally arranged at the threaded connection part, so that the structure is relatively simple, and the operation is simple and convenient.

In order to further improve the sealing performance of the sealing piece on the first channel and the second channel, a hot melt sealing mode can be adopted for sealing, in this case, the structure of the liquid supplementing and changing component needs to be improved, and a hollow component extending along the x direction is coaxially arranged at the end part of the main body of the liquid supplementing and changing component; the hollow member is positioned outside the cylinder; the plugging piece further comprises a first rubber ring and a hot melting piece; the first rubber ring is coaxially fixed in the hollow member, and the hot-melt piece is fixed in the first rubber ring in a hot-melt mode and seals the first channel and the second channel.

The utility model also provides a cylinder body, which is characterized in that: the battery is applied to the high-capacity battery, the battery is taken as a cylinder body of the shell, and the first side wall of the cylinder body is provided with the liquid supplementing and replacing component.

The utility model also provides a liquid supplementing and replacing method of the high-capacity battery, which is characterized in that: after the charge-discharge cycle of the large-capacity battery is set for a time, electrolyte is supplemented into the electrolyte sharing chamber and the inner cavities of each single battery through the electrolyte supplementing and replacing component, or the electrolyte sharing chamber and the electrolyte in the inner cavities of each single battery are replaced.

The beneficial effects of the utility model are as follows:

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

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

In addition, the first side wall of the cylinder body parallel to the yz plane is provided with the liquid supplementing and exchanging component, the operation space is larger in the liquid supplementing and exchanging process, the operation is easy, the electrolyte sharing chamber does not need to be spliced, the structure of the electrolyte sharing chamber is not influenced in the liquid supplementing and exchanging operation process, and the structure stability is high. And when the large-capacity batteries are assembled into the energy storage equipment, the large-capacity batteries are distributed along the width direction (y direction) of the large-capacity batteries, so that the first side wall of each large-capacity battery is exposed, and when the liquid supplementing and replacing component is arranged on the first side wall, liquid supplementing and replacing operation can be conveniently carried out.

Drawings

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

fig. 2 is a schematic structural view of the large-capacity battery in embodiment 1;

fig. 3 is a sectional view of the large-capacity battery in example 1;

Fig. 4 is a schematic structural diagram of the cylinder with the liquid replenishing member fixed thereto in embodiment 1;

FIG. 5 is a cross-sectional view of the cartridge of example 1 to which the replacement fluid supply member is fixed;

FIG. 6 is a schematic view of the structure of the cylinder in example 1;

Fig. 7 is a schematic structural view of a large-capacity battery in embodiment 2;

FIG. 8 is a schematic structural view of a cylinder with a liquid replenishing member fixed thereto in example 2;

FIG. 9 is a cross-sectional view of the cartridge of example 2 to which the replacement fluid supply member is fixed;

FIG. 10 is a schematic view showing a partial structure of a cylinder to which a liquid replenishing member is fixed in embodiment 3;

FIG. 11 is a schematic structural diagram of the main body of the liquid replacement component in embodiment 3;

FIG. 12 is a schematic view showing a partial structure of a cylinder to which a liquid replenishing member is fixed in embodiment 4;

FIG. 13 is a schematic view of the structure of the main body of the liquid replacement component in embodiment 4;

FIG. 14 is an exploded view of the replacement fluid supply member of example 5;

FIG. 15 is a partial exploded view of the replacement fluid supply member of example 5;

The reference numerals in the drawings are:

01. A sub-pipeline; 02. an intermediate connecting pipe; 03. a single battery lower cover plate; 1. a cylinder; 11. a first sidewall; 111. an electrolyte flow channel; 112. a first sidewall outer surface; 113. a first blind hole; 114. a gas flow passage; 2. an upper cover plate; 21. a gas chamber; 3. a lower cover plate; 31. an electrolyte sharing chamber; 4. a single battery; 41. a single battery post; 5. a pole adapter; 6. a liquid supplementing and changing component; 61. a fluid replacement component main body; 611. a first channel; 612. a second channel; 62. capping; 63. a hollow member; 64. a first rubber ring; 65. a hot melt member; 7. a cavity.

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

The utility model provides a high-capacity battery, which comprises a shell and m parallel single batteries arranged in the shell, wherein m is more than 1; the single battery can be a square shell battery or a plurality of commercially available parallel soft package batteries. Each single cell cavity comprises an electrolyte zone and a gas zone.

For convenience of description, the housing length direction is defined as the x direction, the housing width direction is defined as the y direction, and the housing height direction is defined as the z direction.

The shell is provided with an electrolyte sharing chamber and a liquid supplementing and exchanging component; the electrolyte sharing chamber is communicated with the electrolyte areas in the inner cavities of the single batteries; the liquid supplementing and replacing component is used for supplementing electrolyte into the electrolyte sharing cavity and the inner cavities of the single batteries or replacing the electrolyte in the electrolyte sharing cavity and the inner cavities of the single batteries.

The housing may take at least the following two configurations:

The first structure: the device comprises a cylinder body with two open ends (namely, the ports parallel to the yz plane are open ends), and end plate assemblies respectively fixed at the two open ends of the cylinder body (namely, the end plate assemblies are parallel to the yz plane);

The second structure: the device comprises a cylinder body with an open top and an open bottom (namely, the port parallel to the xy plane is the open end), and an upper cover plate and a lower cover plate respectively fixed on the open top and the open bottom of the cylinder body (namely, the upper cover plate and the lower cover plate are both parallel to the xy plane); in this structure, a side wall parallel to the yz plane in the cylinder is referred to as a first side wall. The lower cover plate and the cylinder body can be an integral piece or a split piece.

The following embodiments will mainly be described by taking the second structure as an example.

The electrolyte sharing chamber is located at the lower cover plate.

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

And a gas chamber can be arranged on the upper cover plate and covers the gas ports at the top of each single battery in the large-capacity battery. Here, the gas port includes the following two meanings:

1) The gas port is a through hole which is directly arranged on the upper cover plate of the single battery and penetrates through the inner cavity of the single battery;

At the moment, the inner cavity of the gas cavity is communicated with the gas areas of the inner cavities of all the single batteries through the gas port, the gas cavity is used as a gas sharing cavity of all the single batteries, the gas areas of all the single batteries can be communicated based on the gas cavity, so that the gas balance is achieved, 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 any single battery is out of control, the flue gas in the inner cavity of the single battery enters the gas chamber and is discharged through the gas chamber, so that the safety of the high-capacity battery is improved.

2) The gas port is an explosion venting port or an explosion prevention port arranged on the upper cover plate of the single battery, and an explosion venting membrane is arranged at the explosion venting port or the explosion prevention port;

At the moment, the gas chamber is used as an explosion venting channel, and when the explosion venting membrane at the gas port of any single battery is broken by the inner cavity smoke, the smoke in the inner cavity of the single battery is discharged through the gas chamber, so that the safety of the high-capacity battery is improved.

In order to improve the heat dissipation performance of the high-capacity battery, an avoidance hole which can enable the polar terminal of each single battery to extend out is formed in the upper cover plate; and the polarity terminals of all the single batteries extend out of the avoidance holes, and the upper cover plate area around the avoidance holes is fixedly sealed with the single battery shell.

It should be noted that, the single battery polar terminal described herein may be a single battery polar post, if the single battery polar post is not capable of smoothly extending out of the avoiding hole as the polar terminal, a polar post adaptor may be further connected to the single battery polar post, and the single battery polar post and the polar post adaptor are combined together to form a whole structure as the single battery polar terminal.

The liquid supplementing and replacing component can be fixed at any position of the shell, for example, the liquid supplementing and replacing component can be arranged on a first side wall (either one of the first side walls or both of the first side walls), after the high-capacity battery is charged and discharged for a period of time, the performance of the high-capacity battery is reduced due to the reduction of electrolyte due to the decomposition and consumption of the electrolyte, and the electrolyte can be supplemented into the electrolyte sharing cavity and the inner cavities of each single battery through the liquid supplementing and replacing component, so that the performance of the high-capacity battery is improved; or, after the high-capacity battery is charged and discharged for a period of time, the high-capacity battery performance is affected due to the occurrence of impurities in the electrolyte, and the electrolyte sharing chamber and the electrolyte in the inner cavity of each single battery can be replaced by the liquid supplementing and replacing component, so that the high-capacity battery performance is improved. The replacement may be partial or complete. In addition, after the electrolyte areas in the inner cavities of the single batteries are communicated with the electrolyte sharing chamber, electrolyte can be injected into the inner cavities of the single batteries and the electrolyte sharing chamber again through the liquid supplementing and replacing component, so that the continuity of the electrolyte is ensured.

The utility model will be described in detail with reference to the accompanying drawings and specific embodiments.

Example 1

As shown in fig. 2 and 3, the large-capacity battery of the present embodiment includes a housing and 10 parallel unit batteries 4 disposed in the housing, where the unit batteries 4 are square-shell batteries. In other embodiments, the number of the data may be adjusted according to actual requirements. The bottom of the shell of each single battery 4 is provided with a through hole penetrating through the inner cavity of the shell.

The shell comprises a cylinder body 1, an upper cover plate 2 and a lower cover plate 3 which are covered on the open end of the cylinder body 1, wherein the upper cover plate 2 and the lower cover plate 3 are parallel to the xy plane;

The lower cover plate 3 is provided with an electrolyte sharing chamber 31 extending along the x direction; the electrolyte sharing chamber 31 communicates with the electrolyte area of the inner cavity thereof through the through-holes of the respective unit cells 4.

The upper cover plate 2 is provided with avoiding holes which can enable the polar terminals of the single batteries 4 to extend out; the polarity terminals of the single batteries 4 extend out of the avoidance holes, and the areas of the upper cover plate 2 around the avoidance holes are fixedly sealed with the shell of the single battery 4. As can be seen from the figure, in the present embodiment, the polarity terminal of the battery cell 4 refers to the integral structure of the battery cell pole 41 and the pole adapter 5.

Referring to fig. 4 and 5, in the present embodiment, one of the first side walls 11 is provided with an electrolyte circulation passage 111 and the first side wall 11 is provided with a liquid replenishment member 6; as can be seen from the figure, the partial structure of the fluid replacement component 6 is located on the first sidewall outer surface 112, where the first sidewall outer surface 112 refers to the surface of the first sidewall 11 away from each unit cell 4 in the cylinder 1.

As can be seen from fig. 5, the electrolyte circulation channel 111 of the present embodiment is opened on the first side wall 11 in the z direction. The fluid replacement component 6 comprises a fluid replacement component main body 61 and a plugging piece fixed on the fluid replacement component main body 61; in this embodiment, the main body 61 of the liquid supplementing and replacing member is a cylinder, and in other embodiments, rectangular columns, semi-cylinders, etc. may be selected; the first passage 611 is provided in the replacement fluid member main body 61, and communicates with the electrolyte circulation passage 111.

Referring to fig. 6, in order to fix the replacement fluid member 6 on the first sidewall 11, in the x-direction, a first blind hole 113 is formed in the first sidewall 11 (the open end of the first blind hole 113 is located on the outer surface 112 of the first sidewall), the replacement fluid member main body 61 is fixed in the first blind hole 113 (can be fixed by welding), the first blind hole 113 is sealed, and the first blind hole 113 and the electrolyte circulation channel 111 are penetrated.

In order to reduce the material consumption and the material cost of the cylinder, a cavity 7 isolated from the electrolyte flow passage is formed in the first side wall. After the cavity 7 is formed, the weight of the whole large-capacity battery can be reduced at the same time.

The plugging member in this embodiment is a cap 62 (which may be a nut) fastened on the fluid replacement member main body 61, and is screwed with the fluid replacement member main body 61, and a sealing ring may be disposed at the screwed portion, so as to improve the sealing performance of the portion, and plug the first channel 611.

In other embodiments, the cap 62 may also be connected to the replacement fluid member body 61 with an interference fit, but removal is more difficult relative to the present embodiment.

In other embodiments, the closure may also include a resilient closure post filled within the first channel 611 to further ensure the tightness of the first channel 611. The elastic plugging column can be made of fluororubber, nitrile rubber, natural rubber or ethylene propylene diene monomer rubber which does not react with the electrolyte.

After the large-capacity battery is assembled, both ends of the electrolyte circulation passage 111 are respectively communicated with the electrolyte sharing chamber 31 and the first passage 611 of the liquid replenishing member 6.

When fluid replacement is required, the operation can be performed by the following steps:

Removing the cap 62;

extending the electrolyte injection pipe into the first channel 611 and injecting electrolyte, and after the electrolyte supplementing is finished, extracting the electrolyte injection pipe;

The cap 62 is sealingly fixed to the replacement fluid member main body 61 to block the first passage 611.

When the liquid needs to be changed, the operation can be carried out by the following steps:

Removing the cap 62;

extending the electrolyte extraction tube into the first channel 611 and extracting the electrolyte; then, the electrolyte injection pipe is extended into the first channel 611, and new electrolyte is injected; after the liquid injection is finished, the electrolyte injection pipe is drawn out;

The cap 62 is sealingly fixed to the replacement fluid member main body 61 to block the first passage 611.

In this embodiment, in the process of injecting the liquid, if the pressure in the inner cavity of the housing is too high, the problem of difficulty in injecting the liquid may occur.

Example 2

Unlike embodiment 1, as shown in fig. 7 to 9, the large-capacity battery of the present embodiment is provided with a gas chamber 21 in the upper cover plate 2; the gas chambers 21 are communicated with the gas areas in the inner cavities of the single batteries 4.

Correspondingly, the first side wall 11 is also provided with a gas circulation channel 114 communicated with the gas chamber 21; a second channel 612 is formed on the fluid replacement component main body 61, and the plugging member is further used for plugging the second channel 612.

As shown in fig. 9, the gas flow channel 114 of the present embodiment is formed on the first sidewall 11 along the z-direction and is isolated from the electrolyte flow channel 111; both ends of the gas flow passage 114 communicate with the gas chamber 21 and the second passage 612, respectively. The second channel 612 is an L-shaped channel formed on the main body 61 of the fluid replacement component, and includes a horizontal channel and a vertical channel, and for convenience of processing, the longitudinal section of the horizontal channel is circular in this embodiment.

The plugging member in this embodiment includes, in addition to the cap 62 fastened to the replacement fluid member main body 61, an elastic plugging column sealed in the first channel 611 and the second channel 612, so as to ensure that the replacement fluid member 6 has better sealing performance during normal charge and discharge cycles.

After the large-capacity battery is assembled, both ends of the electrolyte circulation channel 111 are respectively communicated with the electrolyte sharing chamber 31 and the first channel 611 of the fluid replacement member 6, and both ends of the gas circulation channel 114 are respectively communicated with the gas chamber 21 and the second channel 612 of the fluid replacement member 6.

When fluid replacement is required, the operation can be performed by the following steps:

Removing the cap 62, removing the elastic blocking posts sealed in the first channel 611 and the second channel 612;

When the housing cavity has gas, the gas may overflow from the second channel 612, facilitating the injection of liquid into the housing cavity. In order to fill the liquid more smoothly, in this step, an air extraction tube may be inserted into the second channel 612, and an external air extraction device connected to the air extraction tube may be started to perform air extraction, so that a certain negative pressure is formed in the inner cavity of the housing;

Then, the electrolyte injection pipe extends into the first channel 611 and injects electrolyte, and in the process of injecting electrolyte, if the problem of difficult injection occurs, an external air extraction device can be started to form a certain negative pressure in the inner cavity of the shell, and then the electrolyte is injected;

After the fluid infusion is finished, the electrolyte injection pipe and the exhaust pipe are extracted; the elastic blocking posts are sealed in the first channel 611 and the second channel 612, and then the cap 62 is sealed and fixed on the replacement fluid member main body 61.

When the liquid needs to be changed, the operation can be carried out by the following steps:

Removing the cap 62, removing the elastic blocking posts sealed in the first channel 611 and the second channel 612;

Extending the electrolyte extraction tube into the first channel 611 and extracting electrolyte; when the phenomenon that the electrolyte cannot be extracted occurs, an air injection pipe can be inserted into the second channel 612, and protective gas is injected into the inner cavity of the shell to extract the electrolyte; after the liquid extraction is completed, the electrolyte liquid extraction pipe and the gas injection pipe are taken out, the electrolyte liquid injection pipe extends into the first channel 611, and new electrolyte liquid is injected; after the liquid injection is finished, the electrolyte injection pipe is drawn out;

The elastic blocking posts are sealed in the first channel 611 and the second channel 612, and then the cap 62 is sealed and fixed on the replacement fluid member main body 61.

Compared with embodiment 1, in the process of drawing and injecting liquid, the liquid injection and exchange operation can be better realized by inflating the inner cavity of the shell or discharging the gas in the inner cavity of the shell through the second channel 612.

Example 3

Unlike embodiment 2, as shown in fig. 10 and 11, the second passage 612 of the present embodiment is an L-shaped passage including a horizontal passage and a vertical passage, wherein the longitudinal section of the horizontal passage is a sector ring shape. The fan ring shape is concentric with the first channel 611, and compared with the embodiment 2, the radial dimension requirement on the main body 61 of the fluid replacement component is smaller under the condition that the vertical channel has the same flow area, and the air inlet or outlet channel with the largest flow area can be formed on the main body 61 of the fluid replacement component with limited volume, so that the difficulty of fluid extraction or fluid injection is further reduced.

Example 4

Unlike embodiment 2, as shown in fig. 12 and 13, the second passage 612 of the present embodiment includes a horizontal passage and a vertical passage that are mutually communicated, wherein the horizontal passage is a plurality of through holes communicating with the vertical passage, and the plurality of through holes are arranged along the same circumference.

Similar to the fan ring shape, under the condition that the vertical channels have the same flow area, the radial size requirement on the liquid supplementing and replacing component main body 61 is smaller, and the air inlet or outlet channel with the largest flow area can be formed on the liquid supplementing and replacing component main body 61 with a limited volume, so that the liquid pumping or liquid injection difficulty is further reduced.

Example 5

Unlike the above embodiment, the present embodiment also plugs the first channel 611 or the first channel 611 and the second channel 612 on the liquid replacement component main body 61 by means of hot melting, and the following description will be given by taking the example of plugging the first channel 611 and the second channel 612 on the liquid replacement component main body 61 as the plugging material.

As shown in fig. 14 and 15, the present embodiment is provided with a hollow member 63 extending in the x-direction at the upper end portion of the replacement fluid member main body 61; the inner cavity of the hollow member 63 communicates with the first passage 611 and the second passage 612. In general, the hollow member 63 is made of the same aluminum material as the housing, and in order to seal the first channel 611 and the second channel 612 by means of heat fusion, in this embodiment, the first rubber ring 64 is fixed in the hollow member 63 by means of glue sealing, the first channel 611 and the second channel 612 are sealed in the first rubber ring 64 by means of heat fusion, and after the heat fusion material is cooled, the heat fusion piece 65 is formed in the first rubber ring 64. The first rubber ring 64 and the hot melt member 65 are generally made of a rubber material that does not react with the electrolyte, such as fluororubber, nitrile rubber, natural rubber, or ethylene propylene diene monomer rubber.

When fluid replacement is required, the operation can be performed by the following steps:

Removing the cap 62, and forming openings penetrating the first channel 611 and the second channel 612 on the hot melt member 65 by using a cutter;

When the inner cavity of the shell is provided with gas, the gas overflows from the second channel 612, so that liquid is easily injected into the inner cavity of the shell, and in order to more smoothly inject liquid, an exhaust pipe can be inserted into the second channel 612, and an external air exhaust device connected with the exhaust pipe is started to perform air exhaust, so that the inner cavity of the shell forms a certain negative pressure;

Then, the electrolyte injection pipe extends into the first channel 611 and injects electrolyte, and in the process of injecting electrolyte, if the problem of difficult injection occurs, an external air extraction device can be started to form a certain negative pressure in the inner cavity of the shell, and then the electrolyte is injected;

after the fluid infusion is finished, the electrolyte injection pipe and the exhaust pipe are extracted; the first channel 611 and the second channel 612 may be initially sealed with an elastic shutoff column;

then, sealing the opening part by using a hot melting mode;

Finally, after the hot-melt material is cooled, the cap 62 is sealed and fixed to the replacement fluid member main body 61.

When the liquid needs to be changed, the operation can be carried out by the following steps:

Removing the cap 62, and forming openings penetrating the first channel 611 and the second channel 612 on the hot melt member 65 by using a cutter;

Extending the electrolyte extraction tube into the first channel 611 and extracting electrolyte; when the phenomenon that the electrolyte cannot be extracted occurs, an air injection pipe can be inserted into the second channel 612, and protective gas is injected into the inner cavity of the shell to extract the electrolyte; after the liquid extraction is completed, the electrolyte liquid extraction pipe and the gas injection pipe are taken out, the electrolyte liquid injection pipe extends into the first channel 611, and new electrolyte liquid is injected; after the liquid injection is finished, the electrolyte injection pipe is drawn out;

The first channel 611 and the second channel 612 may be initially sealed with an elastic shutoff column; then pouring a hot-melting material at the opening part for sealing; after the hot-melt material cools, the cap 62 is sealed and fixed to the replacement fluid member main body 61.

In the charge-discharge cycle process of the high-capacity battery, the part of the liquid supplementing and replacing component 6 has better sealing performance.

Claims (11)

1. A high capacity battery characterized by: comprises a shell and m single batteries (4) arranged in the shell, wherein m is more than 1; each single battery (4) inner cavity comprises an electrolyte area and a gas area;

Defining the length direction of the shell as the x direction, the width direction as the y direction and the height direction as the z direction;

the shell comprises a cylinder body (1), an upper cover plate (2) and a lower cover plate (3) which are covered at the open end of the cylinder body (1), wherein the upper cover plate (2) and the lower cover plate (3) are parallel to the xy plane;

the upper cover plate (2) is provided with avoiding holes which can enable the polar terminals of the single batteries (4) to extend out; the polarity terminals of the single batteries (4) extend out of the corresponding avoidance holes, and the area of the upper cover plate (2) around the avoidance holes is fixedly sealed with the shell of the single battery (4);

The lower cover plate (3) is provided with an electrolyte sharing chamber (31), and the electrolyte sharing chamber (31) is communicated with electrolyte areas in the inner cavities of the single batteries (4);

At least one first side wall (11) of the cylinder (1) is provided with a liquid supplementing and exchanging component (6), wherein the first side wall (11) is a side wall parallel to the yz plane; the liquid supplementing and replacing component (6) is used for supplementing electrolyte into the electrolyte sharing chamber (31) and the inner cavities of the single batteries (4) or replacing the electrolyte in the electrolyte sharing chamber (31) and the inner cavities of the single batteries (4).

2. The high-capacity battery according to claim 1, wherein: an electrolyte circulation channel (111) is arranged on the first side wall (11);

The liquid supplementing and replacing component (6) comprises a liquid supplementing and replacing component main body (61) and a plugging piece fixed on the liquid supplementing and replacing component main body (61);

A first channel (611) is formed on the liquid supplementing and replacing component main body (61); both ends of the electrolyte circulation channel (111) are respectively communicated with the electrolyte sharing chamber (31) and the first channel (611) of the liquid supplementing and exchanging component (6);

the closure element is used for closing off the first channel (611) from the outside of the first side wall (11).

3. The high-capacity battery according to claim 2, wherein: the first side wall (11) is provided with a cavity (7) isolated from the electrolyte circulation channel (111).

4. The high-capacity battery according to claim 2, wherein:

A first blind hole (113) penetrating through the first side wall (11) is formed on the first side wall (11) along the x direction and is used as a mounting hole of the liquid supplementing and replacing component main body (61);

A second hole penetrating the first side wall (11) is formed in the first side wall (11) along the z direction, and is used as an electrolyte circulation channel (111);

The liquid supplementing and replacing component main body (61) is a cylinder, is fixed in the first blind hole (113) and seals the first blind hole (113); the first channel (611) is provided on the fluid replacement member main body (61) and communicates with the electrolyte circulation channel (111).

5. The high-capacity battery as claimed in claim 4, wherein: the upper cover plate (2) is provided with a gas chamber (21); the gas chamber (21) is communicated with the gas area in the inner cavity of each single battery (4).

6. The high-capacity battery according to claim 5, wherein: the first side wall (11) is also provided with a gas circulation channel (114) communicated with the gas chamber (21);

a second channel (612) is arranged on the liquid supplementing and replacing component main body (61), and the second channel (612) is mutually isolated from the first channel (611);

Both ends of the gas circulation channel (114) are respectively communicated with the gas chamber (21) and the second channel (612) of the liquid supplementing and changing component (6);

The closure element is also used to close off the second channel (612) from the outside of the first side wall (11).

7. The high-capacity battery as claimed in claim 6, wherein: the second channel (612) is an L-shaped channel, comprising a horizontal channel and a vertical channel, wherein the longitudinal section of the horizontal channel is a sector ring.

8. The high-capacity battery as claimed in claim 6, wherein: the second channel (612) comprises a horizontal channel and a vertical channel which are communicated with each other, wherein the horizontal channel is a plurality of through holes communicated with the vertical channel, and the through holes are distributed along the same circumference.

9. The high-capacity battery as claimed in claim 6, wherein: the closure comprises a cap (62) screwed onto the body (61) of the fluid replacement component.

10. The high-capacity battery according to claim 9, wherein: the fluid replacement component (6) also comprises a hollow component (63) which is coaxially arranged at the end part of the fluid replacement component main body (61) and extends along the x direction;

The blocking piece also comprises a first rubber ring (64) and a hot melting piece (65);

The first rubber ring (64) is coaxially fixed in the hollow member (63), and the hot melt piece (65) is fixed in the first rubber ring (64) in a hot melt mode and seals the first channel (611) and the second channel (612).

11. A barrel, characterized in that: the high-capacity battery according to any one of claims 1 to 10, wherein the cylindrical body (1) is used as a housing, and the liquid replenishing member (6) is provided on the first side wall (11) of the cylindrical body.