Heat exchange pipe fitting and high-capacity battery assembly

Abstract

The utility model belongs to the field of batteries, and particularly relates to a heat exchange pipe fitting and a high-capacity battery assembly. The heat exchange pipe fitting comprises a pipe body, and a first channel and at least one row of second channel units are arranged in the pipe body. The high-capacity battery assembly comprises a high-capacity battery and a heat exchange pipe fitting; the high-capacity battery comprises a plurality of single batteries arranged along the x direction; the heat exchange pipe fitting extends along the x direction, and the second channels on the heat exchange pipe fitting are in one-to-one correspondence with the polarity terminals of the high-capacity battery; the first part of the polar terminal of each single battery is inserted into the corresponding second channel, and the electric connection part of the polar terminal extends out of the second channel in the z direction; the two ports of the second channel and the corresponding polarity terminals are sealed. According to the utility model, on the premise of not changing the structure of the polarity terminal, the heat exchange performance of the whole high-capacity battery is improved by optimizing the structure of the heat exchange piece, shortening the heat exchange path and increasing the heat exchange area.

Description

Technical Field

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

[0002] At present, in the market, multiple single cells are usually connected in parallel, in series or in series-parallel 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 times 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 of research.

[0004] To solve the above problems, Chinese Patent CN220797038U discloses a large-capacity battery, the structure of which 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] The 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 4, and the electrolyte sharing chamber 4 is communicated with the electrolyte areas 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 4, 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 6 are opened on the top plate 11 of the housing to enable the polar terminals of the respective single cells 2 to extend out; the polar terminals of the respective single cells 2 extend out of the avoidance holes 6, and the area of the top plate 11 of the housing corresponding to the avoidance holes 6 is fixedly sealed with the upper cover plate of the single cell 2.

[0009] It should be noted that the polar terminals of the above single cells 2 can be the electrode posts of the single cells 2. If it is necessary to avoid that the electrode posts of the single cells 2 cannot smoothly extend out of the avoidance holes 6 or the height of extending out of the avoidance holes 6 does not meet the set requirements, a pole post adapter can also be connected to the electrode posts of the single cells 2, and the overall structure formed by the cooperation of the electrode posts of the single cells 2 and the pole post adapter is used as the polar terminals of the single cells 2.

[0010] During the use of the above-mentioned large-capacity battery, heat will be generated. If heat exchange (heat dissipation) is not timely, it will cause a significant reduction in the battery life, an increase in energy loss, and even potential safety hazards such as spontaneous combustion and fire. Therefore, it is particularly important to improve the heat exchange efficiency of the above-mentioned large-capacity battery.

[0011] In order to improve the heat exchange efficiency of the above-mentioned large-capacity battery, Chinese Patent CN118299714A discloses a large-capacity battery, as Figure 2 shown. In this patent, a card slot is opened at the polar terminal 21 part of the large-capacity battery that extends out of the avoidance hole, and a heat exchange part 01 is fixed in the card slot, which can effectively realize the heat exchange of the large-capacity battery. Moreover, the larger the contact area between the polar terminal 21 and the heat exchange part 01, the better the heat exchange effect, that is, the larger the surface area of the card slot, the larger its contact area with the heat exchange part 01, and the better the heat exchange effect achieved. However, when the surface area of the card slot is too large, it will affect the overall structure of the polar terminal 21, and further affect its electrical conductivity. Summary of the Invention

[0012] The purpose of the present utility model is to provide a heat exchange pipe fitting and a large-capacity battery assembly. Without changing the structure of the polar terminal, by optimizing the structure of the heat exchange part, shortening the heat exchange path, increasing the heat exchange area, and improving the heat exchange performance of the entire large-capacity battery.

[0013] The first aspect of the present utility model provides a heat exchange pipe fitting for a large-capacity battery, and the large-capacity battery includes a plurality of single batteries arranged along the x direction; the heat exchange pipe fitting includes a pipe body, and a first channel and at least one row of second channel units are provided inside the pipe body;

[0014] The first channel extends along the x direction and serves as an insulating heat exchange medium flow cavity;

[0015] Each row of second channel units includes a plurality of second channels arranged along the x direction. Each second channel extends along the z direction and penetrates the first channel, and each second channel corresponds to each polar terminal of the single battery one by one;

[0016] The projected area of the second channel in the xy plane is slightly larger than the projected area of the first part of the corresponding polar terminal in the xy plane, ensuring that the first part of the corresponding polar terminal can be inserted into the second channel. And in the z direction, the size of the second channel is smaller than the size of the first part of the corresponding polar terminal, ensuring that the top of the first part of the polar terminal serves as an electrical connection part and extends out of the second channel in the z direction.

[0017] The utility model optimizes the structure of the heat exchange component. On the basis of the tubular heat exchange component, a plurality of second channels penetrating the pipe wall are opened on the pipe wall. Each second channel corresponds to the polarity terminal of the single battery one by one for the corresponding polarity terminal to pass through. That is, a part of the structure of the polarity terminal is located in the inner cavity of the heat exchange pipe fitting and is in direct contact with the insulating heat exchange medium; another part of the structure of the polarity terminal is located outside the heat exchange pipe fitting and serves as an electrical connection part.

[0018] Compared with the solution of Chinese Patent CN118299714A, firstly, the heat exchange path is shortened. The heat exchange path is shortened from "heat exchange medium - heat exchange component - polarity terminal" to "heat exchange medium - polarity terminal". The heat exchange medium acts directly on the polarity terminal, which can improve the utilization efficiency of the heat exchange medium and further improve the heat exchange efficiency of such large-capacity batteries; secondly, the heat exchange area is increased. The heat exchange area is increased from "the card slot with a certain surface area" to "the part of the structure of the polarity terminal located in the heat exchange pipe fitting", which can further improve the heat exchange efficiency of such large-capacity batteries; finally, there is no need to change the structure of the polarity terminal, which does not affect the electrical conductivity of the polarity terminal.

[0019] Further, the above second-channel unit can be arranged in one row or two rows. When arranged in two rows, the two rows of second-channel units are arranged along the y direction, and each row of second-channel units corresponds to the polarity terminals on the same side.

[0020] The second aspect of the utility model provides a large-capacity battery assembly, which includes a large-capacity battery and the above two heat exchange pipe fittings. The heat exchange pipe fitting has a row of second-channel units; the large-capacity battery includes a plurality of single batteries arranged along the x direction;

[0021] The two heat exchange pipe fittings are arranged along the y direction. Each heat exchange pipe fitting extends along the x direction, and the second channels on each heat exchange pipe fitting correspond to the polarity terminals on the same side of the large-capacity battery one by one; the first part of the polarity terminal of each single battery is inserted into the corresponding second channel, and in the z direction, the electrical connection part of the polarity terminal extends out of the second channel;

[0022] The two ports of the second channel are sealed with the corresponding polarity terminals;

[0023] Insulation is provided between the heat exchange pipe fitting and the top of the large-capacity battery, or between the heat exchange pipe fitting and the polarity terminal. The heat exchange pipe fitting can also be insulated from both the top of the large-capacity battery and the polarity terminal.

[0024] Further, the two heat exchange pipe fittings are connected in series with each other. Usually, the ports of the first channels on the same side of the two heat exchange pipe fittings can be connected by a connecting pipe to achieve series connection, and the other ports of the first channels of the two heat exchange pipe fittings are used as the liquid inlet end and the liquid outlet end of the heat exchange pipe fitting. Insulation is required between the two heat exchange pipe fittings, and an insulating connecting pipe can be used to achieve their series connection.

[0025] The third aspect of the present utility model provides another large-capacity battery assembly, which includes a large-capacity battery and the above-mentioned heat exchange pipe fittings; the heat exchange pipe fittings have two rows of second channel units; the large-capacity battery includes a plurality of single cells arranged along the x direction;

[0026] The heat exchange pipe fittings extend along the x direction and are arranged on the top of the large-capacity battery. The first part of the polar terminal of each single cell is inserted into the corresponding second channel, and in the z direction, the electrical connection part of the polar terminal extends out of the second channel;

[0027] The two ports of the second channel are insulated and sealed with the corresponding polar terminals.

[0028] Furthermore, an O-ring seal can be added between the polar terminal and the two ports of the second channel to achieve sealing. Preferably, two annular grooves can be opened along the circumference of the polar terminal, and the two annular grooves are arranged along the z direction; O-ring seals are embedded in both of the two annular grooves, and the outer rings of the two O-ring seals are respectively pressed against the two ports of the second channel.

[0029] Furthermore, the large-capacity battery further includes a housing; a plurality of single cells are arranged along the x direction in the inner cavity of the housing; 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 single cells;

[0030] Avoidance holes are opened on the top plate of the housing corresponding to the polar terminals of each single cell; the polar terminals of each single cell extend out of the avoidance holes, and the area of the top plate of the housing corresponding to the avoidance holes is fixedly sealed with the housing of the single cell;

[0031] The heat exchange pipe fittings extend along the x direction and are arranged above the top plate of the housing.

[0032] Furthermore, an insulating and sealing adhesive layer is laid on the top of the large-capacity battery, and the heat exchange pipe fittings are located within the insulating and sealing adhesive layer; the liquid inlet end and the liquid outlet end of the heat exchange pipe fittings need to be located outside the insulating and sealing adhesive layer; on the one hand, the sealing performance of each part of the heat exchange pipe fittings can be further improved; specifically, the insulating and sealing adhesive constituting the insulating and sealing adhesive layer penetrates into the gap between the second channel and the polar terminal (blocked by the O-ring seal, the insulating and sealing adhesive cannot flow into the first channel), and further seals this gap radially; on the other hand, the insulating and sealing adhesive will also penetrate into the avoidance hole part that has completed the preliminary sealing to further improve the sealing performance of the avoidance hole part; on the third hand, during long-term use, due to the temperature difference inside and outside the heat exchange pipe fittings, condensation will occur on the surface. When the condensation accumulates to a certain amount, it may cause a short-circuit problem; by laying an insulating and sealing adhesive layer on the top of the large-capacity battery, when condensation occurs on the surface of the heat exchange pipe fittings, the battery short-circuit can be prevented under the protection of the insulating and sealing adhesive layer; on the fourth hand, the insulating and sealing adhesive layer wraps the outside of the entire heat exchange pipe fittings. When using a heat exchange pipe fitting made of a non-insulating material, the insulation between the heat exchange pipe fittings and the top of the large-capacity battery can be further improved.

[0033] Further, the outer shell includes a cylindrical body with open ends at both ends and end plates sealed at the two open ends of the cylindrical body. The end plates are parallel to the yz plane; in the z direction, the side plate of the cylindrical body is higher than the top plate of the cylindrical body, and the part where the side plate of the cylindrical body is higher than the top plate of the cylindrical body is used as a rubber baffle. Such a cylindrical body can be integrally formed by an aluminum extrusion process, which is simple and convenient to process, without the need to additionally introduce a rubber baffle, and simplifies the structure.

[0034] Further, the shared chamber includes an electrolyte shared chamber and a gas shared chamber;

[0035] The electrolyte shared chamber is a third channel provided between the bottom plate of the outer shell and each single battery, and this third channel communicates with the electrolyte area in the inner cavity of each single battery;

[0036] The gas shared chamber is a fourth channel provided between the top plate of the outer shell and each single battery, and this fourth channel covers above the gas ports of each single battery.

[0037] The beneficial effects of the present utility model are as follows:

[0038] The present utility model optimizes the structure of the heat exchange element. On the basis of the tubular heat exchange element, a plurality of second channels penetrating the tube wall are opened on the tube wall, and each second channel corresponds to the polar terminal of the single battery one by one for the corresponding polar terminal to pass through, that is, a part of the structure of the polar terminal is located in the inner cavity of the heat exchange pipe fitting and is in direct contact with the insulating heat exchange medium; another part of the structure of the polar terminal is located outside the heat exchange pipe fitting and serves as an electrical connection part.

[0039] Compared with the solution of Chinese Patent CN118299714A, firstly, the heat exchange path is shortened, and the heat exchange path is shortened from "heat exchange medium - heat exchange element - polar terminal" to "heat exchange medium - polar terminal". The heat exchange medium directly acts on the polar terminal, which can improve the utilization efficiency of the heat exchange medium and thus improve the heat exchange efficiency of such large-capacity batteries; secondly, the heat exchange area is increased, and the heat exchange area is increased from "a card slot with a certain surface area" to "a part of the structure of the polar terminal located in the heat exchange pipe fitting", which can further improve the heat exchange efficiency of such large-capacity batteries; finally, there is no need to change the structure of the polar terminal, which does not affect the electrical conductivity of the polar terminal. Description of the Drawings

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

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

[0042] Figure 3 It is a schematic structural diagram of the heat exchange pipe fitting in Embodiment 1;

[0043] Figure 4 Cross-sectional view of the heat exchange pipe fitting in Example 1;

[0044] Figure 5 Schematic structural diagram of the heat exchange pipe fitting in Example 2;

[0045] Figure 6 Schematic structural diagram of the large-capacity battery assembly in Example 3;

[0046] Figure 7a Cross-sectional view of the large-capacity battery assembly in Example 3;

[0047] Figure 7b Another cross-sectional view of the large-capacity battery assembly in Example 3;

[0048] Figure 8a Schematic structural diagram of the large-capacity battery assembly in Example 4;

[0049] Figure 8b Cross-sectional view of the large-capacity battery assembly in Example 4;

[0050] Figure 9 Schematic structural diagram of a large-capacity battery assembly in Example 5;

[0051] Figure 10 Cross-sectional view of a large-capacity battery assembly in Example 5;

[0052] Figure 11 Another cross-sectional view of a large-capacity battery assembly in Example 5;

[0053] Figure 12 Schematic structural diagram of the large-capacity battery assembly in Example 6;

[0054] Figure 13 Cross-sectional view of a large-capacity battery assembly in Example 6;

[0055] Figure 14 Another cross-sectional view of a large-capacity battery assembly in Example 6;

[0056] Figure 15 Explosion schematic diagram of the outer shell of the large-capacity battery in Example 6;

[0057] Figure 16 Schematic structural diagram of the cylinder in Example 6;

[0058] The reference numerals in the figure are:

[0059] 01. Heat exchange member; 1. Outer shell; 11. Outer shell top plate; 12. Outer shell bottom plate; 13. Cylinder body; 131. Cylinder body side plate; 132. Cylinder body top plate; 14. End plate; 15. Sealing connection member; 2. Single cell; 21. Polarity terminal; 211. Electrical connection part; 3. Heat exchange pipe fitting; 31. Pipe body; 32. First channel; 33. Second channel; 34. O-ring seal; 35. Sealing washer; 4. Electrolyte sharing chamber; 5. Gas sharing chamber; 6. Avoidance hole; 7. Insulating sealant layer; 8. Connecting pipe; 9. Support member; 10. Boss; 16. L-shaped connecting rib; 17. U-shaped connecting rib. Detailed implementation manners

[0060] To make the above objects, features, and advantages of the present utility model more obvious and understandable, the following will describe in detail the specific implementation manners of the present utility model with reference to the accompanying drawings of the specification. Obviously, the described embodiments are part of the embodiments of the present utility model, rather than all embodiments. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art 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 full 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, terms such as "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 two different types of heat exchange pipe fittings, both of which are used for heat exchange of large-capacity batteries. The heat exchange here can be understood as: heat dissipation or heating of large-capacity batteries; when the temperature of the large-capacity battery is higher than the set threshold, the large-capacity battery is cooled by introducing a heat exchange medium with a lower temperature into the heat exchange pipe fitting; when the temperature of the large-capacity battery is lower than the set threshold, the large-capacity battery is heated by introducing a heat exchange medium with a higher temperature into the heat exchange member; by controlling the temperature of the heat exchange medium, it can be ensured that the large-capacity battery always operates at a normal working temperature.

[0064] Such large-capacity batteries include a plurality of single cells arranged in the same direction; for the convenience of description, in the present utility model, the arrangement direction of the single cells is defined as the x direction; the height direction of the single cells is defined as the z direction; the direction perpendicular to both the x and z directions is defined as the y direction, which is consistent with the direction defined in the background art.

[0065] The above large-capacity battery may further include a housing, and a plurality of single cells are arranged in the housing cavity along the x direction.

[0066] The present utility model does not specifically limit the structure of the housing, and at least the following two structures can be adopted:

[0067] The first structure: includes a cylinder with open ends at both ends (that is, the port parallel to the yz plane is an open end) and end plates respectively fixed at the two open ends of the cylinder (that is, the end plates are parallel to the yz plane);

[0068] The second structure: includes a cylinder with open ends at the top and bottom (that is, the ports parallel to the xy plane are open ends) and an upper cover plate and a lower cover plate respectively fixed at the open ends at the top and bottom of the cylinder (that is, 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);

[0069] A shared chamber may also be provided in the above housing.

[0070] It should be noted that:

[0071] The above shared chamber may be an electrolyte shared chamber. The inner cavity of the electrolyte shared chamber is communicated with the inner cavities of each single cell. Through the electrolyte shared chamber, each single cell can be in a unified electrolyte environment, ensuring the uniformity of the electrolyte in each single cell; improving the performance and charge-discharge cycle life of the large-capacity battery. Here, the electrolyte shared chamber is a third channel extending along the length direction of the housing between the bottom plate of the housing and each single cell. This liquid channel can be integrally formed with the bottom plate of the housing or formed by arranging support members between the lower cover plate of the single cell and the bottom plate of the housing.

[0072] The above shared chamber may 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 cell in the large-capacity battery. It should be noted that the gas port here has the following two meanings:

[0073] 1) The gas port is a first through hole directly opened on the upper cover plate of the single cell and penetrating the inner cavity of the single cell;

[0074] At this time, the inner cavity of the gas sharing chamber is communicated with the gas areas of the inner cavities of each single battery through the gas port. Based on the gas sharing chamber, the gas areas of each single battery can be communicated to achieve gas balance, enabling the gas sharing of each single battery to ensure the consistency of each single battery, and improving the cycle life of the large-capacity battery to a certain extent. When thermal runaway occurs in any single battery, the flue gas in the inner cavity of the single battery enters the gas sharing chamber and is discharged through the gas sharing chamber, improving the safety of the large-capacity battery.

[0075] 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 the pressure relief port or the explosion-proof port;

[0076] At this time, the gas sharing 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 the single battery is communicated with the gas sharing chamber, and the internal flue gas is discharged through the gas sharing chamber, improving the safety of the large-capacity battery.

[0077] The above sharing chamber can also be a gas-liquid sharing chamber. Through a gas-liquid sharing chamber, each single battery can be in a unified electrolyte environment and gas environment, improving the performance and charge-discharge cycle life of the large-capacity battery.

[0078] To facilitate the electrical connection of the large-capacity battery with a casing, avoidance holes are opened on the top plate of the casing (in the casing of the first structure, the top plate of the casing here is the cylinder top plate; in the casing of the second structure, the top plate of the casing here is the upper cover plate) corresponding to the polarity terminals of each single battery; the polarity terminals of each single battery extend out of the corresponding avoidance holes as the polarity terminals of the large-capacity battery, and the area of the top plate of the casing corresponding to the avoidance holes is fixedly sealed with the single battery housing, so that the avoidance hole part of the top plate of the casing is sealed.

[0079] It should be noted that the polarity terminal of the single battery described here can be the pole column of the single battery. If it is necessary to avoid that the pole column of the single battery cannot smoothly extend out of the avoidance hole or the height of extending out of the avoidance hole does not meet the set requirements, a pole column adapter can also be connected to the pole column of the single battery, and the overall structure of the cooperation between the pole column of the single battery and the pole column adapter is used as the polarity terminal of the single battery.

[0080] To improve the heat exchange efficiency of the above large-capacity battery, the present invention adopts an inventive concept similar to that of Chinese Patent CN118299714A, that is, mainly conducts heat exchange on the polarity terminals of the single batteries where the heat is relatively concentrated. However, different from Chinese Patent CN118299714A, the present invention considers that by optimizing the structure of the heat exchange element and adopting a direct heat exchange method, the polarity terminals are in direct contact with the heat exchange medium to achieve the heat exchange of the polarity terminals.

[0081] Based on this inventive concept, the utility model adjusts the structure of the heat exchange element, optimizing the original tubular heat exchange element into a heat exchange pipe element having a first channel and at least one row of second channel units; the first channel extends along the x direction; each row of second channel units includes a plurality of second channels arranged along the x direction, and each second channel extends along the z direction and penetrates the first channel;

[0082] In the heat exchange pipe element of the first type of structure, it includes one row of second channel units, and the plurality of second channels in this second channel unit correspond one by one to the polar terminals on the same side of the plurality of single cells;

[0083] In the heat exchange pipe element of the second type of structure, it includes two rows of second channel units, the two rows of second channel units are arranged along the y direction, and the plurality of second channels in the two rows of second channel units correspond one by one to all the polar terminals of the plurality of single cells;

[0084] The orthographic projection area of the second channel in the xy plane in the above two types of heat exchange pipe elements needs to be slightly larger than the orthographic projection area of the first part of the corresponding polar terminal in the xy plane, ensuring that the first part of the corresponding polar terminal can be inserted into the second channel, and in the z direction, the size of the second channel is smaller than the size of the first part of the corresponding polar terminal, ensuring that in the z direction, the top end of the first part of the polar terminal protrudes from the second channel as an electrical connection part; where the first part includes the electrical connection part of the polar terminal and the part close to the electrical connection part (the part close to the electrical connection part is the part located in the first channel).

[0085] In some cases, the cross-sectional areas of the first part and the remaining parts of the polar terminal are exactly equal. Therefore, it can be considered that only "the orthographic projection area of the second channel in the xy plane is slightly larger than the orthographic projection area of the corresponding polar terminal in the xy plane, and in the z direction, the size of the second channel is smaller than the size of the corresponding polar terminal" is required to ensure that the first part of the corresponding polar terminal can be inserted into the second channel, and in the z direction, the electrical connection part of the polar terminal protrudes from the second channel.

[0086] Generally, the shapes of the two ports of the second channel are adapted to the cross-sectional shape of the polar terminal. If the two ports of the second channel are round holes and the cross-section of the polar terminal is circular, then the diameter of the second channel needs to be slightly larger than the outer diameter of the first part of the polar terminal; if the two ports of the second channel are square holes and the cross-section of the polar terminal is square, then the area of the second channel port needs to be slightly larger than the cross-sectional area of the first part of the polar terminal.

[0087] After fixing the above heat exchange pipe element on the top of the large-capacity battery, the first part of each polar terminal is inserted into the corresponding second channel, and in the z direction, the electrical connection part of the polar terminal protrudes from the second channel; the two ports of the second channel are sealed with the corresponding polar terminals.

[0088] The inner cavity of the heat exchange pipe fitting (i.e., the inner cavity of the first channel) serves as the flow cavity for the heat exchange medium. A partial structure of the polar terminal (the first part after removing the electrical connection part) is located in the inner cavity of the heat exchange pipe fitting and is in direct contact with the heat exchange medium. Compared with the effect of indirectly heating the polar terminal by the heat exchange medium through the tubular heat exchange part, firstly, it has a shorter heat exchange path (shortened from "heat exchange medium - heat exchange part - polar terminal" to "heat exchange medium - polar terminal"), which can improve the utilization efficiency of the heat exchange medium; secondly, it has a larger heat exchange area (increased from "the card slot with a certain surface area" to "the partial structure of the polar terminal located in the inner cavity of the heat exchange pipe fitting"), improving the heat exchange efficiency, and thus can further improve the heat exchange efficiency of such large-capacity batteries.

[0089] It should be noted that:

[0090] 1. Since the polar terminal of the present invention is in direct contact with the heat exchange medium, the ideal heat exchange medium should have good insulation, high specific heat capacity and thermal conductivity, good flame retardant performance, low cost, as well as suitable working temperature, long life, non-corrosiveness, etc. In the present invention, the heat exchange medium is a common insulating heat exchange medium in the prior art, which can be but is not limited to insulating oil, fluorinated liquid, etc.

[0091] 2. The above-mentioned first type of heat exchange pipe fitting is located at the top of the large-capacity battery (it can be in contact with the top of the large-capacity battery or not), and is easy to contact the polar terminals of multiple single cells on the same side;

[0092] When the above-mentioned first type of heat exchange pipe fitting is in contact with the top of the large-capacity battery, if the polar terminal is electrically connected to the top of the large-capacity battery through the heat exchange pipe fitting, it will cause a short circuit. Therefore, it is necessary to insulate between the heat exchange pipe fitting and the top of the large-capacity battery, or it can also insulate between the heat exchange pipe fitting and the polar terminal; of course, it can also insulate between the heat exchange pipe fitting and the top of the large-capacity battery and the polar terminal; that is, as long as it is ensured that the polar terminal cannot be electrically connected to the top of the large-capacity battery through the heat exchange pipe fitting.

[0093] Generally, the following methods can be used to solve the above problems:

[0094] 2.1. Select a heat exchange pipe fitting made of insulating material, which can achieve insulation between the heat exchange pipe fitting and the top of the large-capacity battery and the polar terminal;

[0095] 2.2. By using heat exchange pipe fittings made of non-insulating materials, an insulating pad, insulating film or insulating paint can be added between the top of the large-capacity battery and the heat exchange pipe fittings to overcome this problem; an insulating pad, insulating film or insulating paint can also be added to the inner bottom surface of the heat exchange pipe fittings (the side of the heat exchange pipe fittings close to the top of the large-capacity battery) to overcome this problem; the wall of the heat exchange pipe fittings can also be insulated, such as spraying insulating paint, wrapping insulating film, etc., to overcome this problem; an insulating sealing gasket can also be added between the polar terminal and the heat exchange pipe fittings to overcome this problem; of course, for safety reasons, the above methods can be combined to adopt a multiple insulation method to overcome this problem.

[0096] 3. Different from the first type of heat exchange pipe fittings, the second type of heat exchange pipe fittings is easy to contact the polar terminals of different polarities of the same single battery at the same time. Therefore, the second type of heat exchange pipe fittings must be insulated from the polar terminals to avoid the conduction of two polar terminals of different polarities through the heat exchange pipe fittings, resulting in a short circuit; when the second type of heat exchange pipe fittings is insulated from the polar terminals, the polar terminals cannot be electrically connected to the top of the large-capacity battery through the heat exchange pipe fittings either.

[0097] The insulation between the second type of heat exchange pipe fittings and the polar terminals can be achieved in the following ways:

[0098] 3.1. Selecting heat exchange pipe fittings made of insulating materials can achieve the insulation between the heat exchange pipe fittings and the polar terminals, and at the same time achieve the insulation between the heat exchange pipe fittings and the top of the large-capacity battery;

[0099] 3.2. By using heat exchange pipe fittings made of non-insulating materials, an insulating sealing gasket is added between the polar terminals and the heat exchange pipe fittings; the wall of the heat exchange pipe fittings is insulated, such as spraying insulating paint, wrapping insulating film, etc.; for safety reasons, the above methods can be combined to adopt a multiple insulation method to overcome this problem.

[0100] The following will combine the drawings and specific embodiments to elaborate in detail on heat exchange pipe fittings with different structures and the corresponding large-capacity batteries.

[0101] Embodiment 1

[0102] This embodiment is a heat exchange pipe fitting 3 of the first type of structure, specifically as shown in Figure 3 and Figure 4 which are the structural schematic diagram and partial cross-sectional view of the heat exchange pipe fitting 3 of this embodiment respectively; it can be seen from the figure that the heat exchange pipe fitting 3 of this embodiment includes a pipe body 31, and a first channel 32 and 12 second channels 33 (12 second channels 33 form a row of second channel units) are provided in the pipe body 31; the number of the second channels 33 is the same as the number of single batteries 2 in the large-capacity battery. In some other embodiments, the number of the second channels 33 can be adjusted according to the number of single batteries 2 in the large-capacity battery.

[0103] The present utility model does not specifically limit the cross-sectional shape of the pipe body 31. Since the heat exchange pipe fitting 3 in this embodiment is placed on top of a planar large-capacity battery, considering the structural regularity, as can be seen from the figure, the pipe body 31 in this embodiment is a rectangular pipe. In some other embodiments, a circular pipe or other structural forms of pipes can also be used.

[0104] The above-mentioned first channel 32 is a channel opened along the length direction of the pipe body 31. In the present utility model, after the heat exchange pipe fitting 3 is fixed on top of the large-capacity battery, the length direction of the pipe body 31 is consistent with the arrangement direction of the single cells 2 (the arrangement direction of the single cells 2 is the x direction). Therefore, it can be considered that the first channel 32 extends along the x direction. The two end ports of the first channel 32 serve as the liquid inlet end and the liquid outlet end of the heat exchange pipe fitting 3.

[0105] The above-mentioned second channel 33 is a channel that penetrates the pipe wall of the pipe body 31 and communicates with the first channel 32. In the present utility model, after the heat exchange pipe fitting 3 is fixed on top of the large-capacity battery, the extending direction of the second channel 33 is consistent with the height direction of the single cells 2 (the height direction of the single cells 2 is the z direction). Therefore, it can be considered that the second channel 33 extends along the z direction.

[0106] In addition, multiple second channels 33 need to correspond one by one to the polarity terminals 21 on the same side of multiple single cells 2; when it is fixed on top of the large-capacity battery, the electrical connection parts 211 of the polarity terminals of each single cell 2 pass through the bottom ports of the corresponding second channels 33 and extend out from the top ports, and the top ports here are the ports close to the electrical connection parts 211 of the polarity terminals 21.

[0107] Since the cross-sectional areas of each part of the polarity terminals in this embodiment are equal, in order to ensure that the polarity terminals 21 of each single cell 2 can be smoothly inserted into and extend out from the corresponding second channels 33, the projected area of the second channel 33 in the xy plane is slightly larger than the projected area of the corresponding polarity terminal 21 in the xy plane, ensuring that the first part of the corresponding polarity terminal 21 can be inserted into the second channel 33, and in the z direction, the size of the second channel 33 is smaller than the size of the corresponding polarity terminal 21, ensuring that the electrical connection part 211 of the polarity terminal 21 extends out from the second channel 33 in the z direction.

[0108] The shapes of the two ports of the second channel 33 in this embodiment are adapted to the cross-sectional shape of the polarity terminal 21. The shapes of the two ports of the second channel 33 are circular, and the cross-section of the first part of the polarity terminal 21 is also circular, and the diameters of the two ports of the second channel 33 are slightly larger than the outer diameter of the first part of the polarity terminal 21; in some other embodiments, the shapes of the two ports of the second channel 33 can be different from the cross-sectional shape of the first part of the polarity terminal 21, as long as it is ensured that the first part of the polarity terminal 21 can be inserted into the second channel 33.

[0109] Example 2

[0110] This example is the heat exchange pipe fitting 3 of the second type of structure. Specifically, as Figure 5 shown, different from the heat exchange pipe fitting 3 in Example 1, this example includes two rows of second channel units, and the multiple second channels 33 thereon correspond one by one to all the polar terminals 21 of the multiple single cells 2; that is, part of the structures of all the polar terminals 21 in this example are located in the same first channel 32.

[0111] In this example, sealing plates can be added at both ends of the first channel 32, and holes are opened in the sealing plates to serve as the liquid inlet end and the liquid outlet end of the heat exchange pipe fitting 3 respectively.

[0112] Example 3

[0113] This example is a large-capacity battery with the heat exchange pipe fitting 3 in Example 1. For the convenience of description, the large-capacity battery with the heat exchange pipe fitting 3 is defined as a large-capacity battery assembly as a whole. That is, this example is a kind of large-capacity battery assembly, and this large-capacity battery assembly includes a large-capacity battery and the heat exchange pipe fitting 3 in Example 1.

[0114] The specific structure is as Figure 6 and Figure 7a shown, Figure 6 and Figure 7a are the structure diagram and the cross-sectional view of the large-capacity battery assembly in this example respectively;

[0115] It can be seen from the figure that the large-capacity battery in this example includes 12 single cells 2 arranged along the x direction. The single cell 2 in this example is a square shell battery, and the inner cavity of each single cell 2 includes an electrolyte region and a gas region. In other examples, the number of single cells 2 can be adjusted according to actual needs, and the form of the single cell 2 can also be adjusted according to actual needs.

[0116] The heat exchange pipe fitting 3 is arranged on the top of the large-capacity battery, and the polar terminals 21 of each single cell 2 are inserted into the corresponding second channels 33 in the heat exchange pipe fitting 3, and the electrical connection parts 211 of the polar terminals 21 extend out of the second channels 33.

[0117] From Figure 6 it can be seen that this example includes two heat exchange pipe fittings 3. The two heat exchange pipe fittings 3 are respectively sleeved on the polar terminals 21 on different sides based on the second channels 33, and the two heat exchange pipe fittings 3 are connected in series through a connecting pipe 8. In some other examples, the two heat exchange pipe fittings 3 can also be connected in parallel.

[0118] In this example, by using a heat exchange pipe fitting 3 made of insulating material, insulation between the heat exchange pipe fitting 3 and the top of the large-capacity battery as well as the polar terminals 21 is achieved.

[0119] In addition, since the insulating heat exchange medium flows inside the heat exchange pipe fitting 3, the sealing performance of the heat exchange pipe fitting 3 is particularly important. To ensure the sealing performance of the heat exchange pipe fitting 3, starting from Figure 7a As can be seen, in this embodiment, two annular grooves extending along the circumferential direction are provided on each polar terminal 21, and the two annular grooves are arranged in the z direction; and O-ring seals 34 are embedded in the two annular grooves, and the outer rings of the two O-ring seals 34 are respectively pressed against the two ports of the second channel 33, which can not only achieve sealing but also improve the stability of the heat exchange pipe fitting 3.

[0120] In some other embodiments, when the heat exchange pipe fitting 3 is made of a metal material, the sealing between the polar terminal 21 and the top port of the second channel 33 can be achieved by welding (the top port mentioned here is the port close to the electrical connection part 211 of the polar terminal 21, and the welding method can further improve the stability of the heat exchange pipe fitting 3 on the polar terminal); an insulating pad is added between the heat exchange pipe fitting 3 and the top of the large-capacity battery to achieve insulation between the heat exchange pipe fitting 3 and the top of the large-capacity battery.

[0121] To further improve the stability of the heat exchange pipe fitting 3 on the large-capacity battery, as Figure 7b shown, in this embodiment, an L-shaped connecting rib 16 can be added between the heat exchange pipe fitting 3 and the cylinder body of at least one single battery constituting the large-capacity battery. The horizontal plate of the L-shaped connecting rib is fixedly connected to the heat exchange pipe fitting 3, and the vertical plate of the L-shaped connecting rib is fixedly connected to the cylinder body of the single battery. The specific connection method can be selected according to the material of the heat exchange pipe fitting 3. For example, in this embodiment, the heat exchange pipe fitting 3 is made of an insulating material, so the L-shaped connecting rib can be fixedly connected to the heat exchange pipe fitting 3 and the cylinder body of the single battery by screws; when the heat exchange pipe fitting 3 is made of a metal material, the L-shaped connecting rib can be fixedly connected to the heat exchange pipe fitting 3 and the cylinder body of the single battery by welding. In addition, as Figure 7a shown, in this embodiment, an electrolyte sharing chamber 4 can also be provided at the bottom of the large-capacity battery to connect the electrolyte areas in the inner cavities of all the single batteries 2 to achieve the effect of electrolyte sharing. The electrolyte sharing chamber 4 can be a hollow member provided at the bottom of the large-capacity battery, and through holes are opened in both the hollow member and the lower cover plate of the single battery 2, and electrolyte sharing is achieved based on the through holes.

[0122] In some other embodiments, a gas sharing chamber can also be provided between the two heat exchange pipe fittings 3 at the top of the large-capacity battery to connect the gas areas in the inner cavities of all the single batteries 2 to achieve the effect of gas balance.

[0123] For the specific structures of the electrolyte sharing chamber 4 and the gas sharing chamber, reference can be made to the first hollow member and the second hollow member described in Chinese Patent CN117477186A and the electrolyte sharing channel described in CN115275453A.

[0124] Example 4

[0125] This example is also a large-capacity battery assembly. As Figure 8a shown, it includes a large-capacity battery and a heat exchange pipe fitting 3. Different from Example 3, the heat exchange pipe fitting 3 in this example is the heat exchange pipe fitting 3 in Example 2.

[0126] The structure of the large-capacity battery is the same as that in Example 3 and will not be elaborated here.

[0127] The heat exchange pipe fitting 3 is arranged on the top of the large-capacity battery. The polar terminals 21 of each single battery 2 are inserted into the corresponding second channels 33 in the heat exchange pipe fitting 3, and the electrical connection parts 211 of the polar terminals 21 extend out of the second channels 33.

[0128] This example also uses a heat exchange pipe fitting 3 made of insulating medium to achieve insulation between the heat exchange pipe fitting 3 and the polar terminals 21. The sealing method between each polar terminal 21 and the two ports of the second channel 33 is the same as that in Example 3 and will not be elaborated here.

[0129] To improve the stability of the heat exchange pipe fitting 3, this example can adopt a similar method to Example 3, that is, an L-shaped connecting rib is added between the heat exchange pipe fitting 3 and the single battery cylinder. The horizontal plate of the L-shaped connecting rib is fixedly connected to the heat exchange pipe fitting 3, and the vertical plate of the L-shaped connecting rib is fixedly connected to the single battery cylinder. This example can also use a U-shaped connecting rib 17. As Figure 8b shown, the U-shaped connecting rib is buckled on the heat exchange pipe fitting 3, and the two side edges of the U-shaped connecting rib are respectively fixedly connected to the opposite side walls of at least one single battery cylinder constituting the large-capacity battery. The specific connection method can be selected according to the material of the heat exchange pipe fitting 3. For example, the heat exchange pipe fitting 3 in this example is made of insulating material, so the U-shaped connecting rib and the single battery cylinder can be fixedly connected by screws; when the heat exchange pipe fitting 3 made of metal material is used, the U-shaped connecting rib and the single battery cylinder can be fixedly connected by welding.

[0130] It should be noted that in this example, because the heat exchange pipe fitting 3 basically covers the top of the entire large-capacity battery, it is not convenient to set a boss 10 with a relatively large z-direction dimension on the top of such a large-capacity battery to form a gas sharing chamber 5. Each single battery 2 can achieve gas communication through the first through holes opened on its upper cover plate to achieve gas balance.

[0131] Example 5

[0132] This example is another large-capacity battery assembly. Different from Example 3 and Example 4 in its structure, the large-capacity battery in this example also has a housing 1, and the specific structure is as Figures 9 to 11 shown.

[0133] Figure 9 and Figure 10 Taking the addition of the outer shell 1 on the basis of the large-capacity battery in Embodiment 3 as an example, Figure 11 Taking the addition of the outer shell 1 on the basis of the large-capacity battery in Embodiment 4 as an example.

[0134] From Figure 9 and Figure 10 it can be seen that in this embodiment, on the basis of the large-capacity battery in Embodiment 3, the outer shell 1 is added, and each single battery 2 is arranged in the inner cavity of the outer shell 1, and the avoidance holes 6 through which the polar terminals 21 of each single battery 2 can extend are opened on the outer shell top plate 11. In this embodiment, the polar terminal 21 of the single battery 2 is the pole column of the single battery 2, and this pole column has a relatively high height compared with the pole column of the conventional single battery 2. The polar terminals 21 of each single battery 2 extend out of the corresponding avoidance holes 6, and a sealing connection member 15 is added between the avoidance holes 6 and the polar terminals 21 to realize the fixed seal between the area of the outer shell top plate 11 corresponding to the avoidance holes 6 and the housing of the single battery 2.

[0135] The sealing connection member 15 includes a hollow member; the bottom of the hollow member is used for sealing connection with the first area of the single battery 2, and the top of the hollow member is hermetically connected to the second area of the outer shell top plate 11; the first area is the area around any polar terminal 21 on the upper cover plate of any single battery 2 of the single battery 2; wherein, the area around the polar terminal 21 is the area around the insulating gasket on the polar terminal 21. The insulating gasket is a part on the single battery 2 for insulating between the polar terminal 21 and the upper cover plate of the single battery 2. The second area is the area of the outer shell top plate 11 corresponding to any one of the avoidance holes 6. The area of the outer shell top plate 11 corresponding to the avoidance holes 6 is the peripheral area of the outer surface of the outer shell top plate 11 corresponding to any one of the avoidance holes 6; or the area of the outer shell top plate 11 corresponding to the avoidance holes 6 is the hole wall of the avoidance holes 6.

[0136] A support member 9 extending in the x direction is provided between the outer shell bottom plate 12 and each single battery 2 to form a third channel as the electrolyte sharing chamber 4.

[0137] Figure 9 and Figure 10 In, on the outer shell top plate 11, a boss 10 extending in the x direction is provided, and a fourth channel is opened on the boss 10. The fourth channel communicates with the inner cavity of the outer shell 1 as the gas sharing chamber 5 and is connected to the gas area in the inner cavity of each single battery 2; when gas is generated in the inner cavity of the single battery 2, the inner cavity of the fourth channel can also be used as a gas accommodation chamber to relieve the problem of the outer shell 1 bulging caused by gas generation.

[0138] In some other embodiments, only the electrolyte sharing chamber 4 or the gas sharing chamber 5 may be provided.

[0139] The heat exchange pipe fitting 3 is arranged above the top plate 11 of the housing of the large-capacity battery, and there is a certain gap between it and the top plate 11 of the housing. Since the heat exchange pipe fitting 3 is made of insulating material in this embodiment, even if the heat exchange pipe fitting 3 contacts the top plate 11 of the housing, it does not affect the safety performance of the entire large-capacity battery.

[0140] In addition, in order to improve the stability of the heat exchange pipe fitting 3, this embodiment can adopt a similar method to the above embodiment, that is, by adding an L-shaped connecting rib or a U-shaped connecting rib; if an L-shaped connecting rib is adopted, the horizontal plate of the L-shaped connecting rib is fixedly connected to the heat exchange pipe fitting 3, and the vertical plate of the L-shaped connecting rib is fixedly connected to the housing cylinder. If a U-shaped connecting rib is adopted, the U-shaped connecting rib is buckled on the heat exchange pipe fitting 3, and the two side edges of the U-shaped connecting rib are respectively fixedly connected to the opposite side walls of the housing cylinder.

[0141] Embodiment 6

[0142] This embodiment is another large-capacity battery assembly. Different from Embodiment 5, on the basis of Embodiment 5, an insulating sealant layer 7 is laid on the top of the large-capacity battery in Embodiment 5.

[0143] The specific structure is as Figure 12 and Figure 13 shown, Figure 12 and Figure 13 Taking the addition of the insulating sealant layer 7 on the basis of the large-capacity battery assembly shown in Figure 9 and Figure 10 as an example, the insulating sealant layer 7 covers the top of the large-capacity battery, wraps the heat exchange pipe fitting 3, and at the same time fills the space between the polar terminal 21 and the sealing connector 15.

[0144] From Figure 12 it can be seen that the electrical connection parts 211 of the polar terminals 21 in this embodiment all extend out of the insulating sealant layer 7 to facilitate connection with the electrical connector assembly. The electrical connector assembly is an electrical connector for realizing the parallel connection of each single battery 2 in the large-capacity battery and / or the series connection of adjacent large-capacity batteries. At the same time, both the liquid inlet end and the liquid outlet end of the first channel 32 in the heat exchange pipe fitting 3 are exposed from the insulating sealant layer 7, which is convenient for connection with an external heat exchange device storing a heat exchange medium.

[0145] Laying the insulating sealant layer 7 on the top of the large-capacity battery has at least the following advantages:

[0146] First, it further improves the sealing performance of each part of the heat exchange pipe fitting 3;

[0147] Specifically, the insulating sealant constituting the insulating sealant layer 7 penetrates into the gap between the two ports of the second channel 33 and the polar terminal 21 (blocked by the O-ring, the insulating sealant cannot enter the inner cavity of the heat exchange pipe fitting), and further seals this gap radially;

[0148] In addition, this embodiment can also adopt another sealing method different from the above embodiment to achieve the sealing between the two ports of the second channel 33 and the polar terminal 21;

[0149] Specifically, as Figure 14 shown, two sealing washers 35 are sleeved on each polar terminal. The inner ring of the sealing washer 35 is pressed against the polar terminal 21. The heat exchange pipe fitting 3 is located between the two sealing washers 35. Then, an insulating sealing glue layer 7 is laid on the top of the large-capacity battery. The insulating sealing glue wraps the entire heat exchange pipe fitting 3 and the two sealing washers 35 to fix the sealing washers 35 on the polar terminal; it should be noted that under the block of the sealing washer 35, the insulating sealing glue cannot enter the inner cavity of the heat exchange pipe fitting 3.

[0150] II. Secondary sealing of the avoidance hole 6 part;

[0151] Even if there are small gaps between the sealing connector 15 and the housing of the single battery 2 and the outer housing top plate 11 (this gap does not allow the insulating sealing glue to pass through), filling the insulating sealing glue in the space between the polar terminal 21 and the sealing connector 15 can also seal such small gaps to further improve the sealing performance of the avoidance hole 6 part;

[0152] III. Anti-condensation;

[0153] During long-term use, due to the temperature difference inside and outside the heat exchange pipe fitting 3, condensation will be generated on the surface. When the condensation accumulates to a certain amount, it may cause a short-circuit problem; by laying an insulating sealing glue layer 7 on the top of the heat exchange pipe fitting 3, when condensation is generated on the surface of the heat exchange pipe fitting 3, the situation of battery short-circuit can be prevented under the protection of the insulating sealing glue layer 7;

[0154] IV. Achieve the insulation between the heat exchange pipe fitting 3 and the top of the large-capacity battery;

[0155] When using a heat exchange pipe fitting 3 made of non-insulating material, when the insulating sealing glue completely wraps the outside of the heat exchange pipe fitting 3, the insulation of such a heat exchange pipe fitting 3 can be achieved, and the insulation performance between the heat exchange pipe fitting 3 and the top of the large-capacity battery can be further improved;

[0156] V. Improve the stability of the heat exchange pipe fitting 3;

[0157] The insulating sealing glue completely fills the gap between the heat exchange pipe fitting 3 and the large-capacity battery, and further can play a role in fixing the heat exchange pipe fitting 3. When the large-capacity battery assembly includes the insulating sealing glue layer 7, the L-shaped connecting rib and the U-shaped connecting rib can be not used to fix the heat exchange pipe fitting 3.

[0158] In some other embodiments, after the electrical connection component is connected to the polar terminal 21, an insulating sealant layer 7 can be laid on the top of the large-capacity battery, that is, the insulating sealant layer 7 completely covers the polar terminal 21 of the single battery 2 and the connection part between the electrical connection component and the polar terminal 21; in the whole large-capacity battery, after the outer shell 1 is insulated, only the free end of the electrical connection component (used to realize the series connection of the large-capacity battery) is exposed and charged, and the rest are insulated, making such large-capacity batteries have higher safety performance.

[0159] In order to prevent the problem of glue overflow during the glue injection process, in this embodiment, a partial structure of the outer shell 1 is used as a glue baffle, which will be described in detail below in combination with Figure 15 and Figure 16 to explain the structure of the outer shell 1 of this embodiment in detail.

[0160] As Figure 15 [[ID=1%5D]12]]shown, it is an exploded structural schematic diagram of the outer shell 1 of this embodiment. The outer shell 1 is disassembled into a cylinder 13 with open ends at both ends and end plates 14 covering the open ends of the cylinder 13. The structure of the cylinder 13 is as Figure 16 shown. Both ends of the cylinder 13 are open ends, that is, the open ends of the cylinder 13 are parallel to the yz plane; in the z direction, the height of the side plate 131 of the cylinder is higher than the height of the top plate 132 of the cylinder; the part of the side plate 131 of the cylinder that is higher than the top plate 132 of the cylinder is used as a glue baffle. The cylinder 13 can be integrally formed by an aluminum extrusion process, which is convenient for processing. At the same time, it has good sealing performance compared with the split structure.

Claims

1. A heat exchange pipe fitting for a large-capacity battery, the large-capacity battery comprising a plurality of single cells arranged in the x direction; characterized in that: The heat exchange pipe fitting comprises a pipe body, and a first channel and at least one row of second channel units are arranged in the pipe body; The first channel extends in the x direction and serves as a flow chamber for an insulating heat exchange medium; Each row of second channel units comprises a plurality of second channels arranged in the x direction, each second channel extending in the z direction and penetrating the first channel, and each second channel is used to correspond to each polarity terminal of the single cell one by one; The projected area of the second channel in the xy plane is slightly larger than the projected area of the first part of the corresponding polarity terminal in the xy plane, ensuring that the first part of the corresponding polarity terminal can be inserted into the second channel, and in the z direction, the size of the second channel is smaller than the size of the first part of the corresponding polarity terminal, ensuring that in the z direction, the top end of the first part of the polarity terminal serves as an electrical connection part and extends out of the second channel.

2. The heat exchange pipe fitting according to claim 1, wherein: The second channel unit is one row.

3. The heat exchange pipe fitting according to claim 1, wherein: The second channel unit is two rows, and the two rows of second channel units are arranged in the y direction.

4. A large-capacity battery assembly, characterized in that: Comprising a large-capacity battery and two heat exchange pipe fittings according to claim 2; the large-capacity battery comprises a plurality of single cells arranged in the x direction; The two heat exchange pipe fittings are arranged in the y direction, each heat exchange pipe fitting extends in the x direction, and the second channels on each heat exchange pipe fitting correspond to the polarity terminals on the same side of the large-capacity battery one by one; the first parts of the polarity terminals of each single cell are inserted into the corresponding second channels, and in the z direction, the electrical connection parts of the polarity terminals extend out of the second channels; The two ports of the second channel are sealed with the corresponding polarity terminals; The heat exchange pipe fitting is insulated from the top of the large-capacity battery and / or the polarity terminals.

5. The large-capacity battery assembly according to claim 4, wherein: The two heat exchange pipe fittings are connected in series with each other by a connecting pipe, and the two heat exchange pipe fittings are insulated from each other.

6. A large-capacity battery component, characterized in that: Comprising a large-capacity battery and a heat exchange pipe fitting according to claim 3; the large-capacity battery comprises a plurality of single cells arranged in the x direction; The heat exchange pipe fitting extends in the x direction and is arranged on the top of the large-capacity battery, the first parts of the polarity terminals of each single cell are inserted into the corresponding second channels, and in the z direction, the electrical connection parts of the polarity terminals extend out of the second channels; The two ports of the second channel are insulated and sealed with the corresponding polarity terminals.

7. The large-capacity battery assembly according to any one of claims 4 to 6, characterized in that: Two annular grooves are formed in the circumferential direction of the polarity terminal, and the two annular grooves are arranged in the z direction; O-ring seals are embedded in both of the two annular grooves, and the outer rings of the two O-ring seals are respectively pressed against the two ports of the second channel.

8. The large-capacity battery assembly according to any one of claims 4 to 6, characterized in that: The large-capacity battery further comprises a housing; a plurality of single cells are arranged in the inner cavity of the housing in 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 single cells; Avoidance holes are formed in the top plate of the housing corresponding to the polarity terminals of each single cell; the polarity terminals of each single cell extend out of the avoidance holes, and the area of the top plate of the housing corresponding to the avoidance holes is fixedly sealed with the housing of the single cell; The heat exchange pipe fitting extends in the x direction and is arranged above the top plate of the housing.

9. The large-capacity battery assembly according to claim 8, wherein: An insulating and sealing adhesive layer is laid on the top of the large-capacity battery, and the heat exchange pipe fitting is located in the insulating and sealing adhesive layer.

10. The large-capacity battery assembly according to claim 9, characterized in that: The housing comprises a cylindrical body with both ends open and end plates sealed at the two open ends of the cylindrical body, and the end plates are parallel to the yz plane; In the z direction, the side plate of the cylinder is higher than the top plate of the cylinder, and the part where the side plate of the cylinder is higher than the top plate of the cylinder is used as a rubber baffle.

11. The large-capacity battery assembly according to claim 8, characterized in that: The shared chamber includes an electrolyte shared chamber and a gas shared chamber; The electrolyte shared chamber is a third channel provided between the bottom plate of the outer shell and each single cell, and this third channel communicates with the electrolyte area in the inner cavity of each single cell; The gas shared chamber is a fourth channel provided between the top plate of the outer shell and each single cell, and this fourth channel covers above the gas ports of each single cell.

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