High-capacity battery and barrel for high-capacity battery

Abstract

The invention belongs to the field of batteries, and particularly relates to a high-capacity battery and a barrel for the high-capacity battery. The problem that an existing large-capacity battery sharing pipeline assembly is difficult to assemble is solved. Comprising a shell and m single batteries arranged in the shell, the shell is provided with avoiding holes capable of enabling polar terminals of the single batteries to extend out; each single battery polarity terminal extends out of the corresponding avoiding hole, and the shell area on the periphery of the avoiding hole is fixedly sealed with the single battery shell; the shell is provided with a first cavity and at least one second cavity which are communicated with each other; the first chamber extends along the length direction of the shell, and the second chamber extends along the height direction of the shell; electrolyte is arranged in the first cavity and the second cavity, and the electrolyte is communicated with the electrolyte region of the inner cavity of each single battery. According to the invention, the first chamber and the second chamber do not need to be plugged, so that the processing difficulty and the processing cost of the high-capacity battery with the sharing system are greatly reduced, and batch production can be realized.

Description

Technical Field

[0001] The invention belongs to the field of batteries, and in particular relates to a large-capacity battery and a cylinder for the large-capacity battery. Background Art

[0002] Currently, many single cells are connected in parallel or in series on the market to form large-capacity batteries (also called battery modules or battery packs).

[0003] Chinese patent CN 219144456 U discloses a large-capacity battery, the structure of which is as follows Figure 1 As shown, it includes a battery pack body formed by a plurality of single cells connected in parallel and a shared pipeline assembly located at the bottom of the battery pack body; the shared pipeline assembly is used to connect all the inner cavities of the plurality of single cells so that all the single cells in the large-capacity battery are in one electrolyte system. The large-capacity battery can enhance the uniformity of the electrolyte of each single cell in the large-capacity battery through the shared pipeline assembly, improve the cycle life, and can also replenish the electrolyte for the large-capacity battery through the shared pipeline assembly, thereby extending the service life of the large-capacity battery and improving the safety of the large-capacity battery.

[0004] However, this type of shared pipeline assembly is formed by directly sealing and plugging multiple sections of sub-pipes 01 and intermediate connecting pipes 02 with each other by interference fit; at this time, the multiple sections of sub-pipes 01 are arranged one by one on the lower cover plate 03 of the single battery, and the sub-pipes extend along the arrangement direction of the single battery 1, and are extruded integrally with the lower cover plate 03, and are connected to the opening of the lower cover plate 03.

[0005] During assembly, the two ends of the sub-pipeline 01 are used as connecting ends with the middle connecting tube 02 . When two single cells are connected, one end of the sub-pipeline on the two single cells is squeezed into the two ends of the middle connecting tube 02 .

[0006] The shared pipeline assembly requires that each sub-pipeline 01 and the intermediate connecting pipe 02 be coaxial during the plugging process to achieve effective connection. However, the coaxiality of each sub-pipeline and the intermediate connecting pipe 02 is difficult to ensure due to the following reasons:

[0007] 1) The sub-pipeline and the lower cover are an integrated part. If the position of the sub-pipeline on the lower cover is slightly deviated, or the size of each sub-pipeline is slightly deviated, the coaxiality of each sub-pipeline will deviate when plugged in;

[0008] 2) When the above-mentioned integrated part is welded to the cylinder, due to the difference in the welding process, the position of the sub-pipeline relative to the cylinder may be inconsistent, which may lead to deviation in the coaxiality of each sub-pipeline during plugging;

[0009] 3) This solution requires the use of special tooling during plugging. Due to improper use of the tooling or problems with the operation of the construction personnel, the coaxiality of each sub-pipeline may deviate if it is not careful.

[0010] In addition, when plugging in, the deviation between the sub-pipelines will increase with the increase in the number of plug-ins, resulting in the coaxiality between the sub-pipelines being more difficult to ensure as the number of plug-ins increases; resulting in the assembly process, the yield rate decreases as the number of plug-ins increases.

[0011] In summary, since the sub-pipes of two adjacent single cells are difficult to be coaxial, this solution may cause the sub-pipes to be displaced relative to the lower cover plate, or the lower cover plate to be displaced relative to the cylinder during insertion, thereby causing damage to the battery. Summary of the invention

[0012] The purpose of the present invention is to provide a large-capacity battery and a cylinder for the large-capacity battery, so as to overcome the problem that the existing large-capacity battery shared pipeline assembly is difficult to assemble.

[0013] The technical solution of the present invention is to provide a large-capacity battery, which is special in that it includes a shell and m single cells arranged in the shell, m>1; the inner cavity of each single cell includes an electrolyte area and a gas area;

[0014] The shell is provided with avoidance holes through which the polarity terminals of each single battery can extend; the polarity terminals of each single battery extend out of the corresponding avoidance holes, and the shell area around the avoidance holes is fixedly sealed with the shell of the single battery;

[0015] Define 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;

[0016] The housing is provided with a first chamber and at least one second chamber which are interconnected;

[0017] The first chamber extends along the x-direction, and the second chamber extends along the z-direction;

[0018] Both the first chamber and the second chamber contain electrolyte, and the electrolyte is communicated with the electrolyte area in the inner cavity of each single battery.

[0019] The first chamber and the second chamber of the present invention do not need to be plugged in, and there is no need to consider the coaxial plugging problem in the arrangement direction of the single battery cells, and the requirements for processing accuracy and assembly accuracy are relatively low. At the same time, no special tooling is required, and the assembly process is relatively simple, which greatly reduces the processing difficulty and processing cost of such large-capacity batteries with a shared system, and can realize mass production.

[0020] In addition, the present invention adopts the first chamber and the second chamber in different directions. Compared with the large-capacity battery with only the first chamber, under the premise of having the same liquid storage capacity, since the present invention can also store electrolyte in the second chamber, the size of the first chamber can be reduced in the z direction, and then the height of the entire large-capacity battery can be reduced.

[0021] Furthermore, the housing includes a cylinder with two opposite open ends, and a first cover plate and a second cover plate for sealing the two open ends of the cylinder; wherein the first cover plate and the second cover plate are parallel to the xy plane;

[0022] Each single battery is arranged in the cylinder along the x direction;

[0023] The first chamber is located on the second cover plate; the second chamber is located in the cylinder.

[0024] Furthermore, the present invention can adopt a second chamber of various structural forms:

[0025] The second chamber can be located on both sides of the cylinder; a first partition parallel to the first side wall is provided in the cylinder, close to the first side wall of the cylinder, and the cavity formed between the first side wall, the two second side walls and the first partition is used as a second chamber, wherein the first side wall is parallel to the yz plane; the second side wall is parallel to the xz plane.

[0026] The second chamber can also be located in the middle of the cylinder; two first partitions parallel to the yz plane are arranged in the cylinder near the middle of the cylinder, and the cavity formed between the two first partitions and the two second side walls is used as a second chamber.

[0027] The present invention can also provide a through groove along the z direction on at least one of the first side wall of the cylinder and the second side wall of the cylinder, and use the cavity between the through groove and the single battery as a second chamber.

[0028] Furthermore, a plurality of second partitions parallel to the yz plane are provided in the cylinder to divide the inner cavity of the cylinder into a plurality of single cell installation cavities; at least one single cell is fixed in each single cell installation cavity.

[0029] Furthermore, a through groove is provided on the second partition along the z direction, and the cavity between the through groove and the single battery cell can also be used as a second chamber.

[0030] Furthermore, the housing is also provided with a third chamber which is in communication with the second chamber, and the third chamber covers the gas port on the top of each single cell.

[0031] The present invention also provides a cylinder for a large-capacity battery, which is special in that it includes at least one second chamber arranged in the cylinder; the second chamber is used to communicate with the electrolyte area in the inner cavity of each single cell in the large-capacity battery.

[0032] Furthermore, the second chamber is located on both sides of the cylinder; a first partition parallel to the first side wall is provided in the cylinder, close to the first side wall of the cylinder, wherein the first side wall is parallel to the yz plane; the cavity formed between the first side wall, the two second side walls and the first partition is used as a second chamber.

[0033] Furthermore, the second chamber is located in the middle of the cylinder; two first partitions parallel to the yz plane are provided in the cylinder near the middle of the cylinder, and the cavity formed between the two first partitions and the two second side walls is used as a second chamber.

[0034] The present invention can also form a second chamber by providing a through groove along the z direction on at least one of the first side wall of the cylinder and the second side wall of the cylinder, and the through groove cooperates with the side wall of the single battery.

[0035] Furthermore, a plurality of second partitions parallel to the yz plane are provided in the cylinder to divide the inner cavity of the cylinder into a plurality of single cell installation cavities.

[0036] Furthermore, a through groove is provided on the second partition plate along the z direction, and the through groove cooperates with the side wall of the single battery to form a second chamber.

[0037] The beneficial effects of the present invention are:

[0038] 1. The present invention places a plurality of single cells in a housing having a first chamber and a second chamber which are interconnected, and injects electrolyte into the first chamber and the second chamber. The first chamber is interconnected with the inner cavities of each single cell in the housing, and the electrolyte in the first chamber and the second chamber is connected with the electrolyte of each single cell, so that the electrolytes of all single cells are in the same system, which reduces the difference between the electrolytes of each single cell, improves the consistency between each single cell to a certain extent, and thus improves the cycle life of the large-capacity battery to a certain extent.

[0039] The first chamber and the second chamber of the present invention do not need to be plugged in, and there is no need to consider the coaxial plugging problem in the arrangement direction of the single battery cells, and the requirements for processing accuracy and assembly accuracy are relatively low. At the same time, no special tooling is required, and the assembly process is relatively simple, which greatly reduces the processing difficulty and processing cost of such large-capacity batteries with a shared system, and can realize mass production.

[0040] In addition, the present invention adopts the first chamber and the second chamber in different directions. Compared with the large-capacity battery with only the first chamber, under the premise of having the same liquid storage capacity, since the present invention can also store electrolyte in the second chamber, the size of the first chamber can be reduced in the z direction, and then the height of the entire large-capacity battery can be reduced.

[0041] 2. The present invention adopts a cylinder structure with open top and bottom, which is easy to process the second chamber therein. For example, a first partition parallel to the yz plane can be added near the first side wall in the cylinder, and the cavity formed between the first side wall, the second side wall and the first partition is used as a second chamber; two first partitions parallel to the yz plane can also be set in the middle of the cylinder, and the cavity formed between the two first partitions and the two second side walls is used as a second chamber; when the cylinder and the second cover plate are separate parts, the cylinder can be integrally formed by aluminum extrusion technology, and the second chamber can be formed synchronously during the process of forming the cylinder; when the cylinder and the second cover plate are an integral part, they can be integrally formed by die casting technology, and the second chamber can also be formed synchronously during the forming process. In addition, adding a first partition parallel to the yz plane in the cylinder can enhance the strength of the cylinder and improve the structural stability of the entire large-capacity battery.

[0042] 3. The present invention can also provide a groove on the side wall of the cylinder, and use the cavity between the groove and the single battery as the second chamber, without the need for additional partitions, and the structure is relatively simple.

[0043] 4. The present invention divides the inner cavity of the cylinder into a plurality of single-cell battery installation cavities by adding a second partition. When each single-cell battery is fixed in the corresponding single-cell battery installation cavity, the side wall is in direct contact with the second partition. On the first hand, the installation stability of each single-cell battery in the shell can be improved; on the second hand, it can prevent each single-cell battery from swelling, which may lead to the problem of reduced cycle performance of large-capacity batteries; on the third hand, the heat generated during the charging and discharging process of each single-cell battery can be transmitted to the outside through the second partition, reducing the risk of thermal runaway; on the fourth hand, the strength of the cylinder can be further enhanced.

[0044] 5. The present invention can also provide a through groove extending along the z direction on the second partition plate, and use the cavity between the through groove and the single battery as a second chamber to increase the liquid storage space of the entire large-capacity battery.

[0045] 6. The present invention sets a third chamber on the outer shell, which can be connected with the gas area of ​​the inner cavity of each single cell, so that the gas paths of each single cell are connected, and the gases of all single cells are in the same environment, achieving gas balance, reducing the differences between each single cell, and improving the consistency between each single cell, thereby further improving the cycle life of the large-capacity battery; in addition, the third chamber can be connected to the first chamber through the second chamber, so that the inner cavity of each single cell is completely in the same environment, maximizing the consistency between each single cell.

[0046] 7. The third chamber of the present invention can directly cover the explosion venting part on the top of each single battery as an explosion venting channel. When the pressure in the inner cavity of any single battery is too high, the inner cavity gas or thermal runaway smoke breaks through the explosion venting part on each single battery and enters the third chamber and is discharged from the third chamber. Because each single battery has an explosion venting part, and the explosion venting part is located in the gas area of ​​each single battery, the thermal runaway smoke breaks through the explosion venting part and enters the explosion venting channel. The pressure holding time is short and the safety is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 It is a structural schematic diagram of a large-capacity battery in the background technology;

[0048] Figure 2 This is a schematic diagram of the structure of a large-capacity battery in Example 1;

[0049] Figure 3 This is a schematic diagram of the explosion structure of the housing in Example 1;

[0050] Figure 4 It is a structural schematic diagram of the cylinder in Example 1;

[0051] Figure 5 It is a structural schematic diagram of a cylinder in Example 2;

[0052] Figure 6 It is a structural schematic diagram of another cylinder in Example 2;

[0053] Figure 7 It is a structural schematic diagram of the cylinder in Example 3;

[0054] Figure 8 This is an enlarged view of the local structure of the large-capacity battery in Example 3;

[0055] Fig. 9 It is a schematic structural diagram of the first cylinder in Example 4;

[0056] Fig.10 It is a schematic structural diagram of the second cylinder in Example 4;

[0057] Fig.11 It is a schematic structural diagram of the third cylinder in Example 4;

[0058] Fig.12 It is a schematic structural diagram of the fourth cylinder in Example 4;

[0059] Fig.13 It is a schematic diagram of the partial structure of a large-capacity battery with a fourth type of cylinder in Example 4;

[0060] Fig.14 It is a structural schematic diagram of the cylinder in Example 5;

[0061] Fig.15 It is a schematic diagram of the partial structure of a large-capacity battery in Example 5;

[0062] Fig.16 This is a schematic diagram of the structure of a large-capacity battery in Example 6;

[0063] Fig.17 This is a schematic diagram of the explosion structure of the housing in Example 6;

[0064] The accompanying drawings in the figure are marked as follows:

[0065] 01. Multi-section pipeline; 02. Intermediate connecting pipe; 03. Lower cover of single cell; 1. Outer shell; 2. Single cell; 3. Cylinder; 4. First cover; 5. Second cover; 6. First chamber; 7. Opening device operation port; 8. Avoidance hole; 9. Second chamber; 10. First partition; 11. First side wall; 12. Second side wall; 13. Reinforcement rib; 14. Through groove; 15. Second partition; 16. Single cell installation cavity; 17. Third chamber. DETAILED DESCRIPTION

[0066] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the drawings of the specification. Obviously, the described embodiments are part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary persons in the art without creative work should fall within the scope of protection of the present invention.

[0067] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0068] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "top, bottom" etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first, second, etc." are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0069] The present invention provides a large-capacity battery, comprising a housing and m parallel-connected single cells arranged in the housing, where m>1; the single cells described herein may be square-shell batteries or multiple parallel-connected soft-pack batteries available on the market. The inner cavity of each single cell comprises an electrolyte region and a gas region.

[0070] For the convenience of description, the length direction of the shell is defined as the x direction, the width direction of the shell is defined as the y direction, and the height direction of the shell is defined as the z direction.

[0071] The housing is provided with a first chamber and at least one second chamber which are interconnected; the first chamber extends along the x direction, and the second chamber extends along the z direction;

[0072] Both the first chamber and the second chamber contain electrolyte, and the electrolyte is communicated with the electrolyte area in the inner cavity of each single battery.

[0073] The housing can have at least the following two structures:

[0074] The first structure includes a cylinder with open ends at both ends (i.e., the ports parallel to the yz plane are open ends) and end plate assemblies respectively fixed to the two open ends of the cylinder (i.e., the end plate assemblies are parallel to the yz plane);

[0075] The second structure includes a cylinder with open ends at the top and bottom (i.e., the ports parallel to the xy plane are open ends) and a first cover plate and a second cover plate respectively fixed to the open ends at the top and bottom of the cylinder (i.e., the first cover plate and the second cover plate are both parallel to the xy plane);

[0076] Compared with the first structure, in the second structure, the second chamber is easily formed by adding a second partition plate, so the following embodiments are mainly introduced by taking the second structure as an example.

[0077] It should be noted here that the first chamber and the second chamber are electrolyte containing chambers, which, after being connected with the electrolyte area of ​​the inner cavity of each single battery, need to ensure that the electrolyte in the entire large-capacity battery does not contact the external environment.

[0078] A third chamber may also be provided on the housing, and the third chamber covers the gas port on the top of each single cell in the large-capacity battery. It should be noted that the gas port here includes the following two meanings:

[0079] 1) The gas port is a through hole directly opened on the upper cover plate of the single cell and penetrating the inner cavity of the single cell;

[0080] At this time, the inner cavity of the third chamber is connected with the gas area of ​​the inner cavity of each single cell through the gas port. The third chamber serves as a gas sharing chamber for each single cell. Based on the third chamber, the gas areas of each single cell can be connected to achieve gas balance, so that the gas of each single cell is shared to ensure the consistency of each single cell, which improves the cycle life of the large-capacity battery to a certain extent; when any single cell has thermal runaway, the smoke in the inner cavity of the single cell enters the third chamber and is discharged through the third chamber, thereby improving the safety of the large-capacity battery.

[0081] 2) The gas port is an explosion vent or explosion-proof port provided on the upper cover plate of the single cell, and an explosion vent membrane is provided at the explosion vent or explosion-proof port;

[0082] At this time, the third chamber is used as an explosion relief channel. When the explosion relief membrane at the gas outlet of any single battery is broken by the inner cavity smoke, the inner cavity smoke of the single battery is discharged through the third chamber, thereby improving the safety of the large-capacity battery.

[0083] In order to improve the heat dissipation performance of such large-capacity batteries, avoidance holes are opened on the outer shell (first cover plate) to allow the polarity terminals of each single battery to extend out; the polarity terminals of each single battery extend out of the avoidance holes and the top plate area of ​​the cylinder around the avoidance holes is fixedly sealed with the single battery shell.

[0084] It should be noted that the single cell polarity terminal described here can be a single cell pole. In order to avoid the single cell pole being unable to smoothly extend out of the avoidance hole as a polarity terminal, a pole adapter can also be connected to the single cell pole, and the overall structure of the single cell pole and the pole adapter can be used as the single cell polarity terminal.

[0085] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0086] Example 1

[0087] like Figure 2 As shown, the large-capacity battery of this embodiment includes a housing 1 and 10 parallel-connected single cells 2 located in the housing 1. The single cells 2 are square-shell batteries. The number in other embodiments can be adjusted according to actual needs. A through hole is provided at the bottom of the housing of each single cell 2 to penetrate its inner cavity.

[0088] like Figure 3 As shown, the housing 1 includes a cylinder 3 with open ends at opposite ends, and a first cover plate 4 and a second cover plate 5 respectively fixed to the two open ends of the cylinder 3; wherein the first cover plate 4 and the second cover plate 5 are parallel to the xy plane. The second cover plate 5 and the cylinder 3 can be an integral part or a split part. When it is an integral part, the second cover plate 5 and the cylinder 3 can be integrally formed by a die casting process; when it is a split part, the cylinder 3 can be integrally formed by an aluminum extrusion process. The second cover plate 5 can also be integrally formed by an aluminum extrusion process.

[0089] The second cover plate 5 is provided with a first chamber 6 extending along the x direction; the first chamber 6 is connected to the electrolyte area of ​​the inner cavity of each single cell 2 through the through hole of each single cell 2. In this embodiment, one end of the first chamber 6 parallel to the yz plane is opened as the operation port 7 of the unpacking device, and the unpacking device extends into the first chamber 6 through the operation port 7 of the unpacking device to unpack each single cell 2, so that the first chamber 6 is connected to the electrolyte area of ​​the inner cavity of each single cell 2 (when unpacking, the unpacking device extends into the first chamber 6 through the operation port 7 of the unpacking device to open the sealing film sealed at the through hole of the lower cover plate 03 of each single cell 2, and the specific sealing film can be the sealing film disclosed in Chinese patents CN218525645U and CN218525614U). It should be noted that after unpacking, the operation port 7 of the unpacking device needs to be sealed by a blocking member.

[0090] The first cover plate 4 is provided with a relief hole 8 through which the polarity terminals of each single battery 2 can extend; the polarity terminals of each single battery 2 extend out of the relief hole 8 and the area of ​​the first cover plate 4 around the relief hole 8 is fixedly sealed with the housing of the single battery 2. Figure 2 It can be seen that in this embodiment, the polarity terminal of the single cell 2 refers to the pole of each single cell 2.

[0091] A second chamber 9 extending along the z direction is provided in the cylinder 3. The second chamber 9 is connected to the first chamber 6 and its inner cavity is also filled with electrolyte. Figure 4 It can be seen that in this embodiment, two second chambers 9 are provided in the cylinder 3, which are respectively located on both sides of the cylinder 3.

[0092] In this embodiment, a second chamber 9 is formed by setting a first partition 10 in the cylinder 3, wherein the first partition 10 is parallel to the first side wall 11, and the cavity formed between the first side wall 11, the two second side walls 12 and the first partition 10 is used as a second chamber 9, wherein the first side wall 11 is parallel to the yz plane; the second side wall 12 is parallel to the xz plane.

[0093] When the cylinder 3 and the second cover plate 5 are an integral part, the first partition plate 10 is formed at the same time as the integral part by a die-casting process, thereby forming the second chamber 9 .

[0094] When the cylinder 3 and the second cover plate 5 are separate parts, the second chamber 9 can be formed simultaneously when the cylinder 3 is formed by an aluminum extrusion process.

[0095] As can be seen from the figure, in this embodiment, reinforcing ribs 13 are provided in the second chamber 9 along the z direction to divide the second chamber 9 into at least two sub-chambers to improve the strength of the second chamber 9 and further improve the structural stability of the entire large-capacity battery.

[0096] Example 2

[0097] Different from the first embodiment, the second chamber 9 of the present embodiment is located in the middle of the cylinder 3 .

[0098] like Figure 5 As shown, a second chamber 9 is provided in the middle of the cylinder 3; specifically, two first partitions 10 parallel to the yz plane can be provided near the middle of the cylinder 3, and the cavity formed between the two first partitions 10 and the two second side walls 12 is used as a second chamber 9.

[0099] like Figure 6 As shown, two second chambers 9 are provided in the middle of the cylinder 3; similarly, two first partitions 10 parallel to the yz plane can also be provided near the middle of the cylinder 3, and the cavity formed between the two first partitions 10 and the two second side walls 12 is used as a second chamber 9.

[0100] In some other embodiments, more than two second chambers 9 may be provided in the middle of the cylinder 3 , and second chambers 9 may be provided on both sides of the cylinder 3 and in the middle of the cylinder 3 .

[0101] Example 3

[0102] Different from the above-mentioned embodiment, this embodiment has a second chamber 9 with a different structural form.

[0103] like Figure 7 and Figure 8 As shown, in this embodiment, a through groove 14 extending along the z direction is opened on the first side wall 11 and the second side wall 12 of the cylinder 3, and the cavity formed between the through groove 14 and the single battery 2 serves as a second chamber 9; in order to increase the liquid storage space of the entire large-capacity battery, in this embodiment, a second chamber 9 is formed between each single battery 2 and the second side wall 12, and a second chamber 9 is formed between the two outermost single batteries 2 and the first side wall 11.

[0104] In some other embodiments, the through groove 14 may be only provided on the second side wall 12 of the cylinder 3 or the first side wall 11 of the cylinder 3 to form the second chamber 9 .

[0105] Example 4

[0106] Different from the above-mentioned embodiment, a plurality of second partition plates 15 are further provided in the cylinder 3 in this embodiment.

[0107] like Figures 9 to 13 As shown, Fig. 9 Based on the cylinder 3 of Example 1, nine second partitions 15 are added. The nine second partitions 15 are parallel to the yz plane and arranged along the x direction in the cylinder 3 to divide the inner cavity of the cylinder 3 into a plurality of single battery installation cavities 16. Fig. 9It can be seen that the two outermost second partitions 15 respectively form a single cell installation cavity 16 with the adjacent first partitions 10, and the seven second partitions 15 located in the middle respectively form a single cell installation cavity 16 between two adjacent second partitions 15; a single cell 2 is fixed in each single cell installation cavity 16.

[0108] Fig.10 and Fig.11 In order to add a second partition plate 15 on the basis of the cylinder 3 of Example 2, Fig.10 In the embodiment, seven second partitions 15 are added to the cylinder 3 having two second chambers 9. The seven second partitions 15 are parallel to the yz plane and arranged along the x direction in the cylinder 3 to divide the inner cavity of the cylinder 3 into a plurality of single battery installation cavities 16; Fig.10 It can be seen that the four second partitions 15 adjacent to the second chamber 9 form a single cell installation cavity 16 between the adjacent first partitions 10, and the remaining second partitions 15 form a single cell installation cavity 16 between two adjacent second partitions 15 or between the second partition 15 and the first side wall 11. Fig.11 In the embodiment, eight second partitions 15 are added to the cylinder 3 having a second chamber 9. The eight second partitions 15 are parallel to the yz plane and arranged along the x direction in the cylinder 3 to divide the inner cavity of the cylinder 3 into a plurality of single battery installation cavities 16; Fig.11 It can be seen that the two second partitions 15 adjacent to the second chamber 9 form a single cell installation cavity 16 between the adjacent first partitions 10, and the remaining second partitions 15 form a single cell installation cavity 16 between two adjacent second partitions 15 or between the second partition 15 and the first side wall 11.

[0109] Fig.12 and Fig.13 In the embodiment 3, nine second partitions 15 are added to the cylinder 3. The cylinder 3 is divided into ten single cell installation cavities 16. Fig.12 As can be seen in the figure, a single cell 2 is fixed in each single cell installation cavity 16 , and a second chamber 9 is formed between each single cell 2 and the second side wall 12 or the first side wall 11 .

[0110] Example 5

[0111] like Fig.14 and Fig.15 As shown, the difference from the above embodiment is that in this embodiment, Fig.12 On the basis of the structure, a through groove 14 is further provided on the second partition plate 15 along the z direction, and the cavity formed between the through groove 14 and the single battery 2 is also used as a second chamber 9 .

[0112] In some other embodiments, Figures 9 to 11On the basis of the structure, a through groove 14 is further provided on the second partition plate 15 along the z direction, and the cavity formed between the through groove 14 and the single battery 2 is also used as a second chamber 9 .

[0113] Example 6

[0114] like Fig.16 and Fig.17 As shown, the housing 1 of this embodiment is further provided with a third chamber 17 communicating with the second chamber 9 . The third chamber 17 covers the gas port on the top of each single battery 2 and communicates with the gas area in the inner cavity of each single battery 2 . Fig.17 In the example, the third chamber 17 is provided on a large-capacity battery in Embodiment 4. In this embodiment, the gas areas of all the single cells 2 are connected through the third chamber 17, so that the gases of all the single cells 2 are in the same environment, and the gas balance is achieved, which reduces the difference between the single cells 2 and improves the consistency between the single cells 2, thereby further improving the cycle life of the large-capacity battery; in addition, it can be seen from the figure that in this embodiment, the third chamber 17 and the first chamber 6 can be connected through the second chamber 9, which can further reduce the environmental differences of the single cells 2.

[0115] Example 7

[0116] Different from Example 6, the third chamber 17 of this embodiment covers the gas port on the top of each single cell 2 and is used as an explosion relief channel. When the pressure in the inner cavity of any single cell 2 is too high, the inner cavity gas or thermal runaway smoke breaks through the explosion relief part on each single cell 2 and enters the third chamber 17 and is discharged from the third chamber 17.

Claims

1. A large capacity battery, characterized in that: It comprises a housing (1) and m single cells (2) arranged in the housing (1), where m>1; the inner cavity of each single cell (2) comprises an electrolyte region and a gas region; The outer shell (1) is provided with an avoidance hole (8) through which the polarity terminal of each single battery (2) can extend; the polarity terminal of each single battery (2) extends out of the corresponding avoidance hole (8), and the area of ​​the outer shell (1) around the avoidance hole (8) is fixedly sealed with the shell of the single battery (2); The length direction of the housing (1) is defined as the x direction, the width direction is defined as the y direction, and the height direction is defined as the z direction; The housing (1) is provided with a first chamber (6) and at least one second chamber (9) which are interconnected; The first chamber (6) extends along the x-direction, and the second chamber (9) extends along the z-direction; Both the first chamber (6) and the second chamber (9) contain electrolyte, and the electrolyte is connected to the electrolyte area in the inner cavity of each single battery (2).

2. The large-capacity battery according to claim 1, characterized in that: The housing (1) comprises a cylinder (3) with two opposite open ends, and a first cover plate (4) and a second cover plate (5) for sealing the two open ends of the cylinder (3); wherein the first cover plate (4) and the second cover plate (5) are parallel to the xy plane; Each single battery (2) is arranged in the cylinder (3) along the x direction; The first chamber (6) is located on the second cover plate (5); and the second chamber (9) is located inside the cylinder (3).

3. The large-capacity battery according to claim 2, characterized in that: The second chamber (9) is located on both sides of the cylinder (3); a first partition plate (10) parallel to the first side wall (11) is provided inside the cylinder (3) and close to the first side wall (11) of the cylinder (3); a cavity formed between the first side wall (11), the two second side walls (12) and the first partition plate (10) is used as a second chamber (9), wherein the first side wall (11) is parallel to the yz plane; and the second side wall (12) is parallel to the xz plane.

4. The large-capacity battery according to claim 2, characterized in that: The second chamber (9) is located in the middle of the cylinder (3); two first partitions (10) parallel to the yz plane are arranged inside the cylinder (3) and near the middle of the cylinder (3); the cavity formed between the two first partitions (10) and the two second side walls (12) is used as a second chamber (9).

5. The large-capacity battery according to claim 1, characterized in that: The housing (1) comprises a cylinder (3) with two opposite open ends, and a first cover plate (4) and a second cover plate (5) for sealing the two open ends of the cylinder (3); wherein the first cover plate (4) and the second cover plate (5) are parallel to the xy plane; Each single battery (2) is arranged in the cylinder (3) along the x direction; The first chamber (6) is located on the second cover plate (5); A through groove (14) is provided along the z direction on at least one of the first side wall (11) of the cylinder (3) and the second side wall (12) of the cylinder (3), and the cavity between the through groove (14) and the single battery (2) is used as a second chamber (9).

6. The large capacity battery according to any one of claims 3 to 5, characterized in that: A plurality of second partitions (15) parallel to the yz plane are also provided in the cylinder (3), dividing the inner cavity of the cylinder (3) into a plurality of single cell installation cavities (16); at least one single cell (2) is fixed in each single cell installation cavity (16).

7. The large-capacity battery according to claim 6, characterized in that: A through groove (14) is provided on the second partition plate (15) along the z direction, and the cavity between the through groove (14) and the single battery (2) serves as a second chamber (9).

8. The large capacity battery according to any one of claims 1 to 7, characterized in that: The housing (1) is also provided with a third chamber (17) which is in communication with the second chamber (9), and the third chamber (17) covers the gas port at the top of each single cell (2).

9. A cylinder for a large-capacity battery, characterized in that: It comprises at least one second chamber (9) arranged in a barrel (3); the second chamber (9) is used to communicate with the electrolyte area in the inner cavity of each single cell (2) in the large-capacity battery.

10. The large-capacity battery cylinder according to claim 9, characterized in that: The second chamber (9) is located on both sides of the cylinder (3); a first partition plate (10) parallel to the first side wall (11) is provided inside the cylinder (3) and close to the first side wall (11) of the cylinder (3), wherein the first side wall (11) is parallel to the yz plane; and a cavity formed between the first side wall (11), the two second side walls (12) and the first partition plate (10) is used as a second chamber (9).

11. The cylindrical body for a large-capacity battery according to claim 9, characterized in that: The second chamber (9) is located in the middle of the cylinder (3); two first partitions (10) parallel to the yz plane are arranged inside the cylinder (3) and near the middle of the cylinder (3); the cavity formed between the two first partitions (10) and the two second side walls (12) is used as a second chamber (9).

12. A cylinder for a large-capacity battery, characterized in that: A through groove (14) is provided along the z direction on at least one of the first side wall (11) of the cylinder (3) and the second side wall (12) of the cylinder (3); the through groove (14) is used to cooperate with the side wall of the single battery (2) to form a second chamber (9).

13. The cylindrical body for a large-capacity battery according to any one of claims 10 to 12, characterized in that: A plurality of second partitions (15) parallel to the yz plane are also provided in the cylinder (3), dividing the inner cavity of the cylinder (3) into a plurality of single cell installation cavities (16).

14. The large-capacity battery cylinder according to claim 13, characterized in that: A through groove (14) is provided on the second partition plate (15) along the z direction, and the through groove (14) is used to cooperate with the side wall of the single battery (2) to form a second chamber (9).

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