High-capacity battery

Abstract

The utility model belongs to the field of batteries, and particularly relates to a high-capacity battery. The technical problems that the requirement for the size precision of each single battery is high and the working procedure is complex when a gap between an avoiding hole and a single battery pole is sealed by adopting an existing method are solved. Comprising a shell and a plurality of single batteries arranged in an inner cavity of the shell in the x direction; the shell is provided with a shared cavity communicated with inner cavities of all the single batteries; avoiding holes are formed in the top plate of the shell and correspond to the pole columns of the single batteries; the pole of each single battery extends out of the corresponding avoiding hole, a first annular gap is formed between the pole and the corresponding avoiding hole, and an insulating sealant layer is arranged in the first annular gap. Compared with a scheme adopting two welding procedures, the process is simple, and operation is easy and convenient. Besides, even if the top of each single battery is uneven in height difference, a gap exists between an upper cover plate and a shell of an individual single battery in some high-capacity batteries, and the condition that the single battery cannot be sealed is avoided.

Description

Technical Field

[0001] The utility model belongs to the field of batteries, and specifically relates to a large-capacity battery. Background Art

[0002] At present, in the market, multiple single cells are usually connected in parallel or in series to form a large-capacity battery (which can also be called a battery module or a battery pack).

[0003] However, there are differences among the single cells in the existing large-capacity batteries. Due to the existence of the cask effect, the large-capacity battery is often affected by the single cell with the worst performance, resulting in great limitations on the capacity upper limit and cycle life of the entire large-capacity battery. Therefore, how to improve the uniformity of the single cells in the large-capacity battery has become the focus and difficulty in this field.

[0004] To solve the above problems, Chinese Patent CN220797038U discloses a large-capacity battery, and its structure is as Figure 1 shown. Such a large-capacity battery includes a housing 1 and multiple single cells 2.

[0005] Define the length direction of the housing 1 as the x direction, the width direction as the y direction, and the height direction as the z direction;

[0006] Multiple single cells 2 are arranged along the x direction in the inner cavity of the housing 1;

[0007] The bottom plate 12 of the housing is provided with an electrolyte sharing chamber 13, and the electrolyte sharing chamber 13 is communicated with the electrolyte regions in the inner cavities of the respective single cells 2; the electrolytes in the inner cavities of the respective single cells 2 are communicated through the electrolyte sharing chamber 13, so that the electrolytes of all the single cells 2 are in the same system, reducing the differences between the electrolytes of the respective single cells 2, improving the consistency among the respective single cells 2 to a certain extent, and thus improving the cycle life of the large-capacity battery to a certain extent.

[0008] Avoidance holes 3 are formed on the top plate 11 of the housing to enable the pole columns 21 of the respective single cells 2 to extend out; the pole columns 21 of the respective single cells 2 extend out of the avoidance holes 3, and the area of the top plate 11 of the housing corresponding to the avoidance holes 3 is fixedly sealed with the upper cover plate 28 of the single cell 2, realizing the sealing of the annular gap between the avoidance holes 3 and the pole columns 21.

[0009] Generally, laser welding can be used to weld the housing 1 and the upper cover of the single cell 2 in the peripheral area corresponding to each avoidance hole 3 on the top plate 11 of the housing to achieve sealing.

[0010] However, when mass-producing large-capacity batteries, due to processing errors and assembly errors, if it is necessary to ensure that the bottoms of the individual battery cells 2 are on the same horizontal plane, there will be a problem of uneven height differences at the tops (i.e., the upper cover plates 28) of the individual battery cells 2. As a result, there are gaps between the upper cover plates 28 of some individual battery cells 2 and the outer casing 1 in some large-capacity batteries, which may lead to virtual soldering between the outer casing 1 and the upper cover plates 28 during laser welding, and even problems where welding cannot be performed, affecting the yield of large-capacity batteries.

[0011] To overcome the above problems, Chinese Patent CN117477188A adopts the method as Figure 2 shown. A sealing connection member 05 can be added between the avoidance hole 3 and the upper cover plate 28 of the individual battery cell 2 to achieve sealing. The sealing connection member 05 includes a hollow member. The bottom of the hollow member is used for sealing connection with the first area of the individual battery cell 2, and the top of the hollow member is hermetically connected to the second area of the outer casing 1. The first area is the area around any pole post 21 in the upper cover plate 28 of any individual battery cell 2. The second area is the area corresponding to any one avoidance hole 3 on the outer casing 1. The area corresponding to the avoidance hole 3 is the peripheral area on the outer surface of the outer casing 1 corresponding to any one avoidance hole 3; or the area corresponding to the avoidance hole 3 is the hole wall of the avoidance hole 3. Among them, the area around the pole post 21 is the area around the insulating gasket on the pole post 21. The insulating gasket is a part on the individual battery cell 2 used to insulate the pole post 21 and the upper cover plate 28.

[0012] The above solution can well solve the sealing problem of the outer casing 1 of such large-capacity batteries. However, two seals are required, and usually, welding is used for sealing, that is, the bottom and top of the hollow member need to be welded to the upper cover plate 28 of the individual battery cell 2 and the outer casing 1 respectively, making the processing procedure relatively complex. Summary of the Invention

[0013] The purpose of the present utility model is to provide a large-capacity battery to solve the technical problems of high requirements for the dimensional accuracy of each individual battery cell and relatively complex procedures when sealing the gap between the avoidance hole and the pole post of the individual battery cell using the existing method.

[0014] The technical solution of the present utility model is a large-capacity battery, including an outer casing and a plurality of individual battery cells; the plurality of individual battery cells are arranged along the x direction in the inner cavity of the outer casing. The outer casing is provided with at least one shared chamber, and the inner cavity of the shared chamber communicates with the inner cavities of all individual battery cells; avoidance holes are provided on the outer casing top plate corresponding to the pole posts of each individual battery cell; the pole posts of each individual battery cell extend out of the corresponding avoidance holes, and a first annular gap is formed between the pole posts and the corresponding avoidance holes, and an insulating sealant layer is provided in the first annular gap.

[0015] The utility model realizes the sealing of this part by filling an insulating sealant into the annular gap between the avoidance hole and the pole column of each single battery, improving the sealing performance of the entire large-capacity battery housing. Compared with the solution using two welding processes in the background technology, the process is simple and the operation is convenient. In addition, even if there is a problem of uneven height difference at the top (i.e., the upper cover plate) of each single battery, resulting in a gap between the upper cover plate and the housing of some individual single batteries in some large-capacity batteries, there will be no situation where sealing cannot be achieved.

[0016] The pole column of the single battery of the utility model adopts an integral structure, which has a relatively high height compared with the conventional pole column. Compared with the split structure in Chinese Patent CN221041328U, where a pole column adapter is added to the original pole column of the single battery to increase the height of the entire pole column, the pole column structure is more regular, the processing is simple, and the cost is lower.

[0017] In addition, compared with Chinese Patent CN221041328U, the injection molding and sealing process is simple, convenient, and easy to operate.

[0018] Specifically as follows:

[0019] Taking the structure of the housing including a cylinder with open ends at both ends (i.e., the port parallel to the yz plane is an open end) and end plates respectively fixed to the two open ends of the cylinder (i.e., the end plates are parallel to the yz plane) as an example;

[0020] Chinese Patent CN221041328U usually realizes the sealing of the annular gap between the avoidance hole and the pole column through the following process:

[0021] Install each single battery into the cylinder; then fix each pole column adapter to the original pole column of the corresponding single battery from the position of the avoidance hole. Finally, inject an insulating sealant into the annular gap from the gap between the lower surface of the main body of the pole column adapter and the upper surface of the housing top plate to achieve sealing.

[0022] The utility model realizes the sealing of the annular gap between the avoidance hole and the pole column through the following process:

[0023] Install each single battery into the cylinder; install a support member into the cylinder to lift each single battery so that its pole column extends out of the corresponding avoidance hole; finally, directly inject an insulating sealant into the annular gap between the pole column and the avoidance hole to achieve sealing.

[0024] By comparing the above two sealing processes, it can be seen that for Chinese Patent CN221041328U, it is necessary to connect each pole post adapter to the original pole post of the single cell, and then inject insulating sealant into the annular gap through the gap between the lower surface of the pole post adapter and the upper surface of the outer shell top plate. First, when the number of single cells is large, for the two pole posts of each single cell, it is necessary to connect the pole post adapter, making the process relatively complex and the processing cost relatively high. Second, when the gap between the lower surface of the pole post adapter and the upper surface of the outer shell top plate is small, it is difficult for the glue injection tool to reach into this gap, making the glue injection process rather difficult. However, for the present utility model, first, due to the relatively high height of the pole posts, after lifting each single cell based on the support member, the pole posts can extend out of the avoidance holes, and there is no need to connect the pole post adapter for each pole post, thus omitting the process of connecting the pole post adapter, and the process is simple. Second, during the glue injection process, due to the absence of the obstruction of the pole post adapter, the annular gap between the pole post and the avoidance hole is completely exposed, making the glue injection process simple and convenient.

[0025] Furthermore, it further includes a plurality of sealing rings corresponding to the pole posts one by one; the sealing rings are sleeved around the corresponding pole posts, the bottom surface of the sealing ring is in close contact with the upper cover plate of the single cell, and the top surface of the sealing ring is in close contact with the inner surface of the outer shell top plate.

[0026] For the present utility model, sealing rings are sleeved around the pole posts of each single cell; when the outer shell top plate is fixed, under the pressure of the outer shell top plate, the sealing rings seal the gap around the avoidance holes and between the outer shell top plate and the upper cover plate of the single cell. When injecting glue into the annular gap, the insulating sealant liquid will not penetrate into the electrolyte in the inner cavity of the outer shell under the blockage of the sealing rings; in addition, in addition to the function of blocking glue, the sealing rings also have a sealing function, and in cooperation with the insulating sealant, a better sealing effect can be achieved.

[0027] Furthermore, the sealing ring is an L-shaped sealing ring; the L-shaped sealing ring includes a horizontal sealing surface and a vertical sealing surface; the bottom surface of the horizontal sealing surface is in close contact with the upper cover plate of the single cell, the top surface of the horizontal sealing surface is in close contact with the inner surface of the outer shell top plate; the outer peripheral surface of the vertical sealing surface is in close contact with the inner wall of the avoidance hole. At the position of the avoidance hole, sealing is achieved in two directions, namely the axial direction and the radial direction, with better sealing performance. At the same time, the vertical sealing surface cooperates with the avoidance hole, and the positioning of the sealing ring can also be realized.

[0028] Further, a rabbet fit is provided between the hole wall of the relief hole and the outer wall of the insulating sealant layer. For example, at least one first annular groove may be formed along the circumferential direction on the hole wall of the relief hole. When injecting glue into the annular gap, the outer wall of the insulating sealant layer is embedded into the first annular groove, and a rabbet fit structure is formed at this part. At least one first annular protrusion may also be provided along the circumferential direction on the hole wall of the relief hole. When injecting glue into the annular gap, an annular groove adapted to the first annular protrusion is formed in the insulating sealant layer at this part, and the first annular protrusion is embedded into the annular groove, and a rabbet fit structure can also be formed at this part. Based on the rabbet fit structure, the bonding strength of the insulating sealant in the annular gap can be further improved, making the entire insulating sealant part not easily fall off.

[0029] Further, a rabbet fit may also be provided between the side wall of the terminal post and the inner wall of the insulating sealant layer. For example, at least one second annular groove may be formed along the circumferential direction on the side wall of the terminal post. When injecting glue into the annular gap, the inner wall of the insulating sealant layer is embedded into the second annular groove, and a rabbet fit structure is formed at this part. At least one second annular protrusion may also be provided along the circumferential direction on the side wall of the terminal post. When injecting glue into the annular gap, an annular groove adapted to the second annular protrusion is formed in the insulating sealant layer at this part, and the second annular protrusion is embedded into the annular groove, and a rabbet fit structure can also be formed at this part. Similarly, based on the rabbet fit structure, the bonding strength of the insulating sealant in the annular gap can be further improved, making the entire insulating sealant part not easily fall off.

[0030] Further, the present utility model can also improve the stability of the insulating sealant layer in the annular gap in the following ways:

[0031] Specifically, an insulating member is sleeved on the terminal post and fixed on the upper cover plate through the insulating member;

[0032] At least part of the structure of the insulating member is located in the relief hole, and the insulating sealant layer is tightly bonded to the outer peripheral surface of the insulating member located in the relief hole. Usually, when the height of the insulating member of the single cell is relatively low and it is difficult to extend into the relief hole, the height of the insulating member can be increased to ensure that at least part of the structure of the insulating member extends into the relief hole;

[0033] The insulating sealant layer is laid in the annular gap between the terminal post and the relief hole, and the insulating sealant layer is tightly bonded to the outer peripheral surface of the insulating member located in the relief hole. Usually, the material of the insulating member is rubber, plastic, fiber, etc. Compared with the aluminum terminal post, it is easier to bond with the insulating sealant and has a higher bonding strength.

[0034] Further, in the z direction, the upper end surface of the insulating member is not lower than the plane where the upper surface of the outer shell top plate is located. That is to say, the entire outer peripheral surface of the insulating sealant layer and the insulating member is firmly bonded, making the insulating sealant layer have higher stability.

[0035] Further, a rabbet fit can also be provided between the outer sidewall of the insulating member and the inner wall of the insulating sealant layer. Specifically, at least one third annular groove can be formed along the circumferential direction on the outer sidewall of the insulating member, and the insulating sealant layer is embedded in the third annular groove. When injecting glue into the annular gap, the insulating sealant layer is embedded in the third annular groove, forming a rabbet fit structure at this part; at least one third annular boss can also be provided along the circumferential direction on the outer sidewall of the insulating member. When injecting glue into the annular gap, the insulating sealant layer forms an annular groove adapted to the third annular boss at this part, and the third annular boss is embedded in the annular groove, also forming a rabbet fit structure at this part; similarly, based on the above rabbet fit structure, the bonding strength of the insulating sealant in the annular gap can be further improved, ensuring that the entire insulating sealant part is not easily detached.

[0036] Further, it also includes a plurality of fixed annular fasteners corresponding to the pole columns one by one; the cross-section of the annular fastener is L-shaped, including a horizontal mounting surface and a vertical limiting surface, and at least one through hole is formed on the vertical limiting surface;

[0037] The annular fastener is sleeved around the corresponding pole column, and the horizontal mounting surface is welded to the upper cover plate area around the pole column. The vertical limiting surface is located in the annular gap, the insulating sealant layer covers the annular fastener, and part of the insulating sealant is embedded in the through hole of the vertical limiting surface. Based on the annular fastener, the stability of the insulating sealant layer in the annular gap can be further improved.

[0038] The beneficial effects of the present utility model are:

[0039] By filling the insulating sealant into the annular gap between the avoidance hole and each single-cell battery pole column, the present utility model realizes the sealing of this part and improves the sealing performance of the entire large-capacity battery housing. Compared with the solution using two welding processes in the background art, the process is simple and the operation is convenient. In addition, even if there is a problem of uneven height difference at the top (i.e., the upper cover plate) of each single-cell battery, resulting in a gap between the upper cover plate of some individual single-cell batteries and the housing in some large-capacity batteries, there will be no situation where sealing cannot be achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 is a schematic structural diagram of a large-capacity battery in the background art;

[0041] Figure 2 is a schematic structural diagram of another large-capacity battery in the background art;

[0042] Figure 3 is a schematic structural diagram of the large-capacity battery in Embodiment 1;

[0043] Figure 4Schematic diagram of local explosion of large-capacity battery in Embodiment 1;

[0044] Figure 5 Cross-sectional view of large-capacity battery in Embodiment 1;

[0045] Figure 6 Partial cross-sectional view of a large capacity;

[0046] Figure 7 Cross-sectional view of a large-capacity battery in Embodiment 2;

[0047] Figure 8 Partial cross-sectional view of a large-capacity battery in Embodiment 2;

[0048] Figure 9 Cross-sectional view of a large-capacity battery in Embodiment 3;

[0049] Figure 10 Partial cross-sectional view of a large-capacity battery in Embodiment 3;

[0050] Figure 11 Cross-sectional view of a large-capacity battery in Embodiment 6;

[0051] Figure 12 Partial cross-sectional view of a large-capacity battery in Embodiment 6;

[0052] Figure 13 Cross-sectional view of a large-capacity battery in Embodiment 7;

[0053] Figure 14 Partial cross-sectional view of a large-capacity battery in Embodiment 7;

[0054] Figure 15 Partial cross-sectional view of another large-capacity battery in Embodiment 7;

[0055] Figure 16 Schematic diagram of the structure of the annular fastener in Embodiment 8;

[0056] Figure 17 Partial cross-sectional view of another large-capacity battery in Embodiment 8;

[0057] Figure 18 Partial cross-sectional view of another large-capacity battery in Embodiment 8;

[0058] Reference numerals in the figure are:

[0059] 05. Sealing connector; 1. Outer shell, 11. Outer shell top plate; 12. Outer shell bottom plate; 13. Electrolyte sharing chamber; 14. Gas sharing chamber; 16. Support member; 17. Boss; 2. Single cell; 21. Terminal post; 22. Insulating sealant layer; 23. First annular groove; 24. Second annular groove; 27. Insulating member; 28. Upper cover plate; 29. Annular fastener; 291. Horizontal mounting surface; 292. Vertical limiting surface; 3. Avoidance hole; 30. Second unpacking member; 31. First unpacking member; 32. Through hole; 35. Sealing ring. Detailed implementation manners

[0060] To make the above objects, features, and advantages of the present utility model more obvious and understandable, the following detailed description of the specific implementation manners of the present utility model is provided in conjunction with the accompanying drawings of the specification. Obviously, the described embodiments are part of the embodiments of the present utility model, rather than all embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0061] In the following description, many specific details are set forth to facilitate a thorough understanding of the present utility model. However, the present utility model can also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the connotation of the present utility model. Therefore, the present utility model is not limited by the specific embodiments disclosed below.

[0062] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by terms such as "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 utility model 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 a limitation of the present utility model. In addition, the terms "first, second, third, fourth, etc." are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0063] The present utility model discloses a large-capacity battery, including an outer shell and a plurality of single cells; the plurality of single cells are arranged in the inner cavity of the outer shell in the same direction.

[0064] A rectangular outer shell is usually adopted. For the convenience of description, the length direction of the outer shell is defined as the x direction, the width direction of the outer shell is defined as the y direction, and the height direction of the outer shell is defined as the z direction.

[0065] The present utility model does not make specific limitations on the structure of the outer shell, and at least the following two structures can be adopted:

[0066] 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 plates respectively fixed to the two open ends of the cylinder (i.e., the end plates are parallel to the yz plane);

[0067] 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 an upper cover plate and a lower cover plate respectively fixed to the open ends at the top and bottom of the cylinder (i.e., both the upper cover plate and the lower cover plate are parallel to the xy plane, and the lower cover plate can be an integral structure with the cylinder);

[0068] A shared chamber is provided inside the above-mentioned housing.

[0069] It should be noted that:

[0070] The above-mentioned shared chamber can be an electrolyte shared chamber. The inner cavity of the electrolyte shared chamber is communicated with the inner cavities of each single battery. Through the electrolyte shared chamber, each single battery can be in a unified electrolyte environment, ensuring the uniformity of the electrolyte in each single battery; improving the performance and charge-discharge cycle life of the large-capacity battery. Here, the electrolyte shared chamber is a liquid channel extending along the length direction of the housing between the bottom plate of the housing and each single battery. This liquid channel can be integrally formed with the bottom plate of the housing or can be formed by setting support members between the lower cover plate of the single battery and the bottom plate of the housing.

[0071] The above-mentioned shared chamber can also be a gas shared chamber provided on the top plate of the housing. The gas shared chamber covers the gas ports on the tops of each single battery in the large-capacity battery. It should be noted that the gas port here has the following two meanings:

[0072] 1) The gas port is a first through hole directly opened on the upper cover plate of the single battery and penetrating the inner cavity of the single battery;

[0073] At this time, the inner cavity of the gas shared chamber is communicated with the gas area of the inner cavity of each single battery through this gas port. Based on the gas shared chamber, the gas areas of each single battery can be communicated to achieve gas balance, enabling each single battery to share gas to ensure the consistency of each single battery, and improving the cycle life of the large-capacity battery to a certain extent; when any single battery undergoes thermal runaway, the flue gas in the inner cavity of this single battery enters the gas shared chamber and is discharged through the gas shared chamber, improving the safety of this large-capacity battery.

[0074] 2) The gas port is a pressure relief port or an explosion-proof port provided on the upper cover plate of the single battery, and a pressure relief membrane is provided at this pressure relief port or explosion-proof port;

[0075] At this time, the gas shared chamber is used as a pressure relief channel. When the pressure relief membrane at the gas port of any single battery is broken by the flue gas in the inner cavity, the inner cavity of this single battery is communicated with the gas shared chamber, and the internal flue gas is discharged through the gas shared chamber, improving the safety of this large-capacity battery.

[0076] The above-mentioned shared chamber can also be a gas-liquid shared chamber. Through a gas-liquid shared chamber, each single battery can be in a unified electrolyte environment and gas environment, improving the performance and charge-discharge cycle life of large-capacity batteries.

[0077] To facilitate the electrical connection of such large-capacity batteries, relief holes are provided on the top plate of the outer shell (in the outer shell of the first structure, the top plate of the outer shell here is the cylindrical top plate; in the outer shell of the second structure, the top plate of the outer shell here is the upper cover plate) corresponding to the pole columns of each single battery; the pole columns of each single battery extend out of the corresponding relief holes as the pole columns of the large-capacity battery, and the area of the top plate of the outer shell corresponding to the relief holes is fixedly sealed with the housing of the single battery, so that the relief hole part of the top plate of the outer shell is sealed.

[0078] The present utility model contemplates that after the pole columns of each single battery extend out of the relief holes, an insulating sealant layer is laid in the annular gap between the pole columns and the relief holes to achieve the fixed seal between the area of the top plate of the outer shell corresponding to the relief holes and the upper cover plate of the single battery.

[0079] In this embodiment, by laying an insulating sealant layer in the annular gap, compared with the scheme of using two welding processes in the background art, the process is simple and the operation is convenient. In addition, even if there is a problem of uneven height difference at the top (i.e., the upper cover plate) of each single battery, resulting in a gap between the upper cover plate of some individual single batteries and the outer shell in some large-capacity batteries, there will be no situation where sealing cannot be achieved.

[0080] The following further describes the present utility model in conjunction with the drawings and specific embodiments.

[0081] Embodiment 1

[0082] As Figures 3 to 5 shown, the large-capacity battery of this embodiment includes an outer shell 1 and 12 single batteries 2 arranged in the inner cavity of the outer shell 1 in the same direction. In other embodiments, the number of single batteries 2 can be adjusted according to actual needs.

[0083] The outer shell 1 includes a cylinder with open ends at both ends (i.e., the ports parallel to the yz plane are open ends) and end plates respectively fixed to the two open ends of the cylinder; it can be seen from Figure 5 that in this embodiment, a support member 16 extending in the x direction is provided between the bottom plate 12 of the outer shell and each single battery 2 to form a liquid channel as the electrolyte shared chamber 13; the electrolyte regions in the inner cavities of each single battery 2 are communicated with the electrolyte shared chamber 13 by opening the second unpacking members 30 of the lower cover plates of each single battery 2.

[0084] On the top plate 11 of the outer shell, there is a boss 17 extending in the x direction. A gas passage is opened on the boss 17, and this gas passage communicates with the inner cavity of the outer shell 1 to serve as a gas sharing chamber 14. By opening the first opening member 31 on the upper cover plate 28 of each single cell 2, the gas area in the inner cavity of each single cell 2 is communicated with the gas sharing chamber 14; when gas is generated in the inner cavity of the single cell 2, the inner cavity of the gas sharing chamber 14 can also serve as a gas accommodation chamber to relieve the bulging problem of the outer shell 1 caused by gas generation.

[0085] In some other embodiments, when the upper cover plate 28 does not have the first opening member 31, the gas sharing chamber 14 covers above the gas ports of each single cell 2. At this time, the gas sharing chamber 14 is used as a venting channel. When the venting film at the gas port of any single cell 2 is broken by the flue gas in the inner cavity, the inner cavity of this single cell 2 is communicated with the gas sharing chamber 14, and the flue gas inside it is discharged through the gas sharing chamber 14, improving the safety of this large-capacity battery.

[0086] In some other embodiments, only an electrolyte sharing chamber 13 or a gas sharing chamber 14 may be provided.

[0087] As Figure 5 shown, avoidance holes 3 through which the pole columns 21 of each single cell 2 can extend are also opened on the top plate 11 of the outer shell. The pole columns 21 of each single cell 2 extend out corresponding to the avoidance holes 3, and the area of the top plate 11 of the outer shell corresponding to the avoidance holes 3 is fixedly sealed with the housing of the single cell 2.

[0088] In this embodiment, by injecting glue into the annular gap between the avoidance hole 3 and the pole column 21, the area of the top plate 11 of the outer shell corresponding to the avoidance hole 3 is fixedly sealed with the housing of the single cell 2. Figure 5 In, in order to facilitate the display of the avoidance hole 3, an insulating sealing glue layer 22 is shown in one annular gap, and the insulating sealing glue layer 22 is not shown in the other annular gap.

[0089] In this embodiment, by laying an insulating sealing glue layer 22 in the annular gap, compared with the scheme of adopting two welding processes in the background art, the process is simple and the operation is convenient. In addition, even if there is a problem of uneven height difference at the top (i.e., the upper cover plate 28) of each single cell 2, resulting in a gap between the upper cover plate 28 of some individual single cells 2 and the outer shell 1 in some large-capacity batteries, there will be no situation where sealing cannot be achieved.

[0090] The pole column 21 of the single cell 2 of the present utility model adopts an integral structure and has a relatively high height compared with the conventional pole column 21. Usually, the following process can be adopted to seal the annular gap between the avoidance hole 3 and the pole column 21:

[0091] Load each single battery 2 into the cylinder body; load the support member 16 into the cylinder body, raise each single battery 2 so that its pole column 21 extends out of the corresponding avoidance hole 3; finally, directly inject insulating sealant into the annular gap between the pole column 21 and the avoidance hole 3 to achieve sealing.

[0092] Chinese Patent CN221041328U discloses a large-capacity battery, which realizes electrical connection by adding a pole column adapter on the original pole column 21 of the single battery 2 so that the pole column 21 and the pole column adapter extend out of the avoidance hole 3 as a whole; usually, the following process can be adopted to seal the annular gap between the avoidance hole 3 and the pole column 21:

[0093] Load each single battery 2 into the cylinder body; then fix and connect each pole column adapter to the original pole column 21 of the corresponding single battery 2 from the position of the avoidance hole 3. Finally, inject insulating sealant into the annular gap from the gap between the lower surface of the main body of the pole column adapter and the upper surface of the outer shell top plate 11 to achieve sealing.

[0094] Compared with the split structure of the pole column 21 and the pole column adapter adopted in Chinese Patent CN221041328U, the integral pole column 21 of the present utility model has a more regular structure and is simple to process, making the manufacturing cost of the large-capacity battery lower;

[0095] In addition, compared with the sealing process of Chinese Patent CN221041328U, the sealing process of the present utility model is relatively simple and convenient, specifically as follows:

[0096] When the number of single batteries 2 in the large-capacity battery is large, Chinese Patent CN221041328U needs to connect pole column adapters to the two pole columns 21 of each single battery 2, making its process relatively complex and the processing cost higher; while in the present utility model, due to the relatively high height of the pole column 21, after each single battery 2 is raised based on the support member 16, its pole column 21 can extend out of the avoidance hole 3, and there is no need to connect pole column adapters to each pole column 21, thus omitting the process of connecting pole column adapters, and the process is simple; in addition, in Chinese Patent CN221041328U, when the gap between the lower surface of the pole column adapter and the upper surface of the outer shell top plate 11 is small, it is difficult for the glue injection tool to extend into this gap, making the glue injection process more difficult; while in the present utility model, during the glue injection process, due to the absence of the obstruction of the pole column adapter, the annular gap between the pole column 21 and the avoidance hole 3 is completely exposed, making the glue injection process simple and convenient.

[0097] Embodiment 2

[0098] When the inner surface of the outer shell top plate 11 and the upper cover plate 28 of the single battery 2 fit tightly, such as Figure 5As shown, the insulating sealant liquid may not penetrate into the electrolyte in the inner cavity of the housing 1. However, when there is a large gap between the inner surface of the top plate 11 of the housing and the upper cover plate 28 of the single cell 2, such as Figure 6 shown, during the process of injecting the insulating sealant into the annular gap, under the action of gravity, the insulating sealant liquid will inevitably flow into the electrolyte in the inner cavity of the housing 1 from the annular gap and the gap between the inner surface of the top plate 11 of the housing and the upper cover plate 28 of the single cell 2. When the insulating sealant liquid contains substances that can react with the electrolyte, it may affect the battery performance.

[0099] To overcome this problem, as Figure 7 and Figure 8 shown, in this embodiment, an O-ring seal is sleeved around the periphery of the pole column 21 of each single cell 2; the bottom surface of the seal ring 35 is in close contact with the upper cover plate 28 of the single cell 2, and the top surface of the seal ring 35 is in close contact with the inner surface of the top plate 11 of the housing. The inner ring surface of the O-ring seal can also be in close contact with the outer peripheral surface of the pole column 21; in addition to acting as a glue barrier, this seal ring 35 also has a sealing function, and when combined with the insulating sealant, a better sealing effect can be achieved.

[0100] The seal ring 35 can be made of plastic material, which has a certain elasticity and does not react with the electrolyte. The seal ring 35 may have no connection relationship with the upper cover plate 28 of the corresponding single cell 2. It is only placed in the corresponding position, and the outer housing top plate 11 can press the seal ring 35 against the upper cover plate 28 of the corresponding single cell 2; in order to prevent the seal ring 35 from falling off or shifting during the installation process, the bottom surface of the seal ring 35 can be bonded to the upper cover plate 28 of the corresponding single cell 2, or a circular groove for fixing the seal ring 35 can be pre-opened on the upper cover plate 28 of the single cell 2, and the seal ring 35 can be fixed in this circular groove.

[0101] Embodiment 3

[0102] Different from Embodiment 2, in this embodiment, the structure of the seal ring 35 in Embodiment 2 is optimized. Through optimization, the glue-blocking and sealing performance of the seal ring 35 can be further improved.

[0103] The specific structure is as Figure 9 and Figure 10 shown. In this embodiment, an L-shaped seal ring is used, that is, the cross-section of the L-shaped seal ring is L-shaped; the L-shaped seal ring includes a horizontal sealing surface and a vertical sealing surface; the horizontal sealing surface is clamped between the upper cover plate 28 of the single cell 2 and the top plate 11 of the housing, and the vertical sealing surface is located in the annular gap, and the outer ring surface of the vertical sealing surface is in close contact with the wall of the avoidance hole 3.

[0104] Based on the fact that the vertical sealing surface can seal from the axial direction of the avoidance hole, and in addition, the vertical sealing surface fits against the wall of the avoidance hole, it is possible to position the L-shaped sealing ring and prevent the sealing ring 35 from falling off or shifting during installation.

[0105] Embodiment 4

[0106] Different from the above embodiments, in this embodiment, the structure of the avoidance hole 3 in the above embodiments is optimized, which can improve the compressive capacity of the insulating sealant layer 22 and avoid the problem that when the internal pressure of the large-capacity battery increases, the insulating sealant layer 22 is washed off, resulting in damage to the sealing performance of the large-capacity battery.

[0107] From Figure 8 and Figure 10 it can be seen that in this embodiment, a first annular groove 23 is formed along the circumferential direction of the avoidance hole 3 on the wall of the avoidance hole 3. When injecting glue into the annular gap, the glue liquid seeps into the first annular groove 23, and a stop structure is formed at this part. The insulating sealant liquid that seeps into the first annular groove 23 solidifies to be the convex stop, and the first annular groove 23 serves as the concave stop. The two cooperate with each other so that the entire insulating sealant layer 22 is not easily detached.

[0108] In some other embodiments, a plurality of first annular grooves 23 can be formed on the wall of the avoidance hole 3, which can further improve the bonding strength of the insulating sealant layer 22 in the avoidance hole 3.

[0109] In some other embodiments, at least one first annular boss can also be provided along the circumferential direction of the wall of the avoidance hole 3. When injecting glue into the annular gap, an annular groove adapted to the first annular boss is formed in the insulating sealant layer at this part, and the first annular boss is embedded in the annular groove, and a stop structure can also be formed at this part; based on this stop structure, the bonding strength of the insulating sealant in the annular gap can also be further improved, making the entire insulating sealant part not easily detached.

[0110] Embodiment 5

[0111] Different from the above embodiments, as Figure 8 and Figure 10 shown, in this embodiment, a second annular groove 24 is formed along the circumferential direction of the pole column 21 on the side wall of the pole column 21 in the above embodiments. When injecting glue into the annular gap, the glue liquid seeps into the second annular groove 24, and a stop structure is formed at this part. The insulating sealant liquid that seeps into the second annular groove 24 solidifies to be the convex stop, and the second annular groove 24 serves as the concave stop. The two cooperate with each other so that the entire insulating sealant layer 22 is not easily detached.

[0112] In some other embodiments, a plurality of second annular grooves 24 may be formed on the terminal post 21, which can further improve the bonding strength of the insulating sealant layer 22 in the avoidance hole 3.

[0113] In some other embodiments, at least one second annular boss may be provided on the side wall of the terminal post along its circumferential direction. When injecting glue into the annular gap, an annular groove adapted to the second annular boss is formed at this part of the insulating sealant layer, and the second annular boss is embedded in the annular groove, and a rabbet fit structure can also be formed at this part. Similarly, based on the rabbet fit structure, the bonding strength of the insulating sealant in the annular gap can be further improved, making the entire insulating sealant part not easily fall off.

[0114] Embodiment 6

[0115] In the above embodiments, an insulating member 27 is provided between the terminal post 21 and the upper cover plate 28. Refer to Figure 10 , the terminal post 21 is fixed on the upper cover plate 28 through the insulating member 27, and is insulated from the upper cover plate 28 through the insulating member 27. The insulating member 27 can be an annular insulating glue layer formed by pouring insulating glue between the terminal post 21 and the upper cover plate 28, or an insulating glue sleeve arranged between the terminal post 21 and the upper cover plate 28, etc. The material of the insulating member 27 can adopt the insulating material between the terminal post 21 and the upper cover plate 28 in the prior art. In addition, the connection manner of the insulating member 27 with the terminal post 21 and the upper cover plate 28 can also adopt the relevant prior art, and this embodiment does not make specific limitations.

[0116] In order to improve the stability of the insulating sealant layer 22 in the annular gap, in this embodiment, the insulating member 27 is heightened so that at least part of the structure of the insulating member 27 is located in the avoidance hole 3, and the insulating sealant layer 22 is tightly adhered to the outer peripheral surface of the insulating member 27 located in the avoidance hole 3.

[0117] From Figure 11 and Figure 12 It can also be seen that in this embodiment, the insulating member 27 sleeved on the terminal post 21 of each single battery 2 extends into the corresponding avoidance hole 3. By injecting insulating sealant into the annular gap to form the insulating sealant layer 22, the fixed sealing of the area of the outer shell top plate 11 corresponding to the avoidance hole 3 and the housing of the single battery 2 is realized. Usually, the material of the insulating member 27 is rubber, plastic, fiber, etc. Compared with the bonding strength with the aluminum polar terminal, the insulating sealant is more easily adhered to the insulating member 27 and has a higher bonding strength, so that the insulating sealant layer 22 has higher stability.

[0118] Embodiment 7

[0119] In this embodiment, on the basis of Embodiment 6, the height of the insulating member 27 is extended, such as Figures 13 to 15As shown, it can be seen from the figure that in this embodiment, the upper end surface of the insulating member 27 is slightly higher than the plane where the upper surface of the outer shell top plate 11 is located, and the insulating sealant layer 22 is tightly adhered to the outer peripheral surface of the insulating member 27 located in the avoidance hole 3.

[0120] A third annular groove can also be formed on the insulating member 27 along its circumferential direction. When injecting glue into the annular gap, the glue seeps into the third annular groove, and a stop structure is formed at this part. The insulating sealant liquid that seeps into the third annular groove solidifies to form a convex stop, and the third annular groove serves as a concave stop. The cooperation between the two makes the entire insulating sealant layer 22 not easily fall off.

[0121] The sealing ring 35 can be an O-ring, such as Figure 14 As shown, the inner ring surface of the O-ring is in close contact with the outer peripheral surface of the insulating member 27, and there can also be a certain distance between the inner ring surface of the O-ring and the outer peripheral surface of the insulating member 27.

[0122] The sealing ring 35 can also be an L-shaped sealing ring, such as Figure 15 As shown, the L-shaped sealing ring includes a horizontal sealing surface and a vertical sealing surface; the bottom surface of the horizontal sealing surface is in close contact with the upper cover plate 28 of the single battery 2, and the top surface of the horizontal sealing surface is in close contact with the inner surface of the outer shell top plate 11; the inner peripheral surface of the vertical sealing surface is in close contact with the outer peripheral surface of the insulating member 27, and the insulating sealant layer 22 is located on the L-shaped sealing ring. The outer peripheral surface of the vertical sealing surface can also be in close contact with the wall of the avoidance hole to realize the positioning of the sealing ring 35.

[0123] In order to further improve the stability of the insulating sealant layer 22, in this embodiment, the large-capacity battery outer shell 1 can also be spray-coated. On the one hand, it can insulate the aluminum outer shell 1. On the other hand, compared with the bonding strength with the aluminum outer shell 1, the insulating sealant is easier to bond with the spray-coated outer layer and has a higher bonding strength, thereby making the insulating sealant layer 22 have higher stability. In addition, by matching the types of the spray-coated material and the insulating sealant, the bonding strength between the two can be made better.

[0124] Embodiment 8

[0125] Based on the above embodiment, this embodiment further includes a plurality of annular fasteners corresponding to the pole columns one by one; based on the annular fasteners, the stability of the insulating sealant layer 22 in the annular gap can be further improved.

[0126] The structure of the specific annular fastener is as Figure 16 As shown, the cross-section of the annular fastener 29 is L-shaped, including a horizontal mounting surface 291 and a vertical limiting surface 292; at least one through hole 32 is formed on the vertical limiting surface 292.

[0127] Combined with Figure 17 and Figure 18, in this embodiment, an annular fastener 29 is sleeved on each pole column. The horizontal mounting surface of the annular fastener 29 is welded to the upper cover plate 28 area around the pole column 21. The vertical limiting surface 292 of the annular fastener 29 is located in the annular gap. When injecting glue into the annular gap, the glue completely covers the annular fastener 29, and part of the glue is embedded in the through hole of the annular fastener 29, so that the insulating sealant layer 22 is firmly combined with the annular fastener 29. The welding of the horizontal mounting surface 291 of the annular fastener 29 to the upper cover plate 28 area around the pole column can ensure that the entire insulating sealant layer 22 is not easily detached.

Claims

1. A high-capacity battery, characterized in that: It includes a housing and multiple single cells; the multiple single cells are arranged in the inner cavity of the housing along the x direction, the housing is provided with at least one shared chamber, and the inner cavity of the shared chamber communicates with the inner cavities of all the single cells; avoidance holes are provided on the top plate of the housing corresponding to the pole columns of each single cell; the pole columns of each single cell extend out of the corresponding avoidance holes, and a first annular gap is formed between the pole columns and the corresponding avoidance holes, and an insulating sealant layer is provided in the first annular gap.

2. The large-capacity battery according to claim 1, wherein: It further includes multiple sealing rings corresponding to the pole columns one by one; the sealing rings are sleeved on the peripheries of the corresponding pole columns, the bottom surface of the sealing ring is in close contact with the upper cover plate of the single cell, and the top surface of the sealing ring is in close contact with the inner surface of the top plate of the housing.

3. The large-capacity battery according to claim 2, characterized in that: The sealing ring is an L-shaped sealing ring; the L-shaped sealing ring includes a horizontal sealing surface and a vertical sealing surface; the bottom surface of the horizontal sealing surface is in close contact with the upper cover plate of the single cell, the top surface of the horizontal sealing surface is in close contact with the inner surface of the top plate of the housing; the outer peripheral surface of the vertical sealing surface is in close contact with the inner wall of the avoidance hole.

4. The large-capacity battery according to claim 2, wherein: The wall of the avoidance hole and the outer wall of the insulating sealant layer are in rabbet fit.

5. The large-capacity battery according to claim 4, characterized in that: The side wall of the pole column and the inner wall of the insulating sealant layer are in rabbet fit.

6. The large-capacity battery according to any one of claims 1 to 4, characterized in that: An insulating member is sleeved on the pole column and fixed on the upper cover plate through the insulating member; At least part of the structure of the insulating member is located in the avoidance hole, and the insulating sealant layer is tightly bonded to the outer peripheral surface of the insulating member located in the avoidance hole.

7. The large-capacity battery according to claim 6, wherein: In the z direction, the upper end surface of the insulating member is not lower than the plane where the upper surface of the top plate of the housing is located.

8. The large-capacity battery according to claim 7, wherein: The outer side wall of the insulating member and the inner wall of the insulating sealant layer are in rabbet fit.

9. The large-capacity battery according to claim 8, wherein: It further includes multiple fixed annular fasteners corresponding to the pole columns one by one; The cross section of the annular fastener is L-shaped, including a horizontal mounting surface and a vertical limiting surface, and at least one through hole is provided on the vertical limiting surface; The annular fastener is sleeved on the periphery of the corresponding pole column, and the horizontal mounting surface is welded to the upper cover plate area around the pole column, the vertical limiting surface is located in the annular gap, the insulating sealant layer covers the annular fastener, and part of the insulating sealant is embedded in the through hole of the vertical limiting surface.

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