Polar terminal, single battery, battery member, and battery pack

Abstract

The utility model belongs to the battery field, concretely is a kind of polarity terminal, single battery, battery component and battery package.Solve the problem that the heat of single battery pole position in existing battery module is too high and may cause thermal runaway.Polarity terminal, including polarity terminal main part, it is equipped with two first through slots, two first through slots are used to cooperate with heat pipe, to form heat transfer medium flow sub-cavity between polarity terminal main part and heat pipe inner wall.Pole of single battery is equipped with polarity terminal, battery component includes multiple single batteries, battery package includes multiple battery components, after heat pipe is installed to polarity terminal, at least part of structure of polarity terminal directly contacts with heat transfer medium directly, realizes the heat exchange of polarity terminal, improves the utilization efficiency of heat transfer medium.

Description

Technical Field

[0001] This utility model belongs to the field of batteries, specifically a polar terminal, a single cell, a battery component, and a battery pack. Background Technology

[0002] Currently, common battery modules (also known as battery packs) are composed of multiple individual cells (which are generally cylindrical or square) connected together in series, parallel, or a combination of series and parallel connections.

[0003] Temperature control of battery modules has always been a hot topic in this field. Most existing battery modules use air cooling or liquid cooling to control the temperature of the entire battery module. However, since the terminals of individual cells in the battery module are the parts with the most concentrated heat, if the local heat of the terminals is too high, it is very likely to cause thermal runaway of the individual cells in the battery module. Summary of the Invention

[0004] To address the issue of excessive heat at the terminal of a single battery cell in existing battery modules, which could lead to thermal runaway, this invention provides a polarity terminal, a single battery cell, a battery component, and a battery pack.

[0005] The first aspect of this utility model provides a polar terminal, including a polar terminal body, on which two first through slots are provided, the two first through slots are arranged along a second direction, and each first through slot penetrates the polar terminal body along the first direction.

[0006] The polar terminal body portion between the two first through slots is defined as the first portion of the polar terminal body;

[0007] Two first through slots are used to cooperate with the heat transfer tube to form a heat transfer medium flow cavity between the first part of the polar terminal body and the inner wall of the heat transfer tube; wherein the first direction and the second direction are perpendicular.

[0008] This invention forms a heat transfer medium flow sub-cavity between the polar terminal body and the inner wall of the heat transfer tube, with at least a portion of the polar terminal structure directly contacting the heat transfer medium. After constructing the battery module, heat transfer tubes can be fixed on the polar terminals of each individual battery cell located on the same side, forming a heat transfer channel at the top of the battery module for heat exchange. The partial structure of the battery polar terminal is directly placed within the heat transfer medium flow sub-cavity, allowing direct contact between the polar terminal and the heat transfer medium, thus achieving heat exchange at the polar terminal. This provides a shorter heat exchange path, and the heat transfer medium acts directly on the polar terminal, improving the utilization efficiency of the heat transfer medium and enhancing the heat exchange efficiency of the battery module.

[0009] Furthermore, the first part of the polar terminal body is provided with a functional structure for increasing the heat exchange area. A larger heat exchange area means that more heat can be transferred under the same time and conditions. This is crucial for the stable operation of the battery module, effectively preventing problems such as performance degradation and shortened lifespan caused by overheating. At the same time, efficient heat exchange also makes the temperature distribution of each individual cell in the battery module more uniform, reducing inconsistencies in battery performance caused by temperature differences, further improving the stability and reliability of the entire battery module, and ensuring that it can work efficiently and stably under different operating conditions.

[0010] Furthermore, the functional structure is a through hole, which extends through the first part of the polarity terminal body in the first direction to allow the heat transfer medium to pass through.

[0011] When the heat transfer medium flows through the polar terminal body, the through holes allow the heat transfer medium to more fully surround the polar terminal body. Originally, it could only contact the surface of the polar terminal body for heat exchange, but now it can achieve internal heat exchange through the through holes, which greatly improves the amount of heat transferred per unit time and accelerates the heat dissipation speed on the polar terminal.

[0012] Furthermore, a welding part is provided on the side wall of the first through groove away from the first part of the polar terminal body, and the welding part is used to weld and fix it to the heat transfer tube.

[0013] Welding the polar terminals to the heat transfer tubes enables a tight connection between them. Compared to other connection methods, such as simple mechanical fixing, welding eliminates the tiny gaps between the connection points, greatly reducing thermal resistance, improving the heat conduction efficiency between the two, and ensuring effective heat transfer. Welding also enhances the stability of the connection, preventing the heat transfer tubes from separating from the polar terminals due to vibration or other factors during battery operation, thus affecting the heat dissipation effect.

[0014] A second aspect of this invention provides a single-cell battery, including an electrode assembly and the aforementioned polarity terminal connected to the tabs of the electrode assembly.

[0015] The third aspect of this utility model provides a battery component, including a battery module and two heat transfer tubes;

[0016] The battery module includes n individual batteries arranged along a first direction; wherein, the individual battery is the aforementioned individual battery, and n is an integer greater than 1;

[0017] Each heat transfer tube has a polarity terminal clearance opening on its tube wall;

[0018] Each heat transfer tube extends along a first direction, and two heat transfer tubes are arranged along a second direction, respectively embedded in the first through slots of each polarity terminal located on different sides. The first part of the polarity terminal body in each polarity terminal extends into the inner cavity of the heat transfer tube through the polarity terminal clearance port. The polarity terminal and the polarity terminal clearance port are sealed, forming a heat transfer medium flow sub-cavity between the inner wall of the heat transfer tube and the first part of the polarity terminal body in each polarity terminal.

[0019] This utility model inserts a heat transfer tube with a polarity terminal clearance port into the first through groove of each polarity terminal located on the same side, so that the first part of the polarity terminal body of each polarity terminal extends into the inner cavity of the heat transfer tube through the polarity terminal clearance port, and seals the gap between the polarity terminal and the polarity terminal clearance port, forming two sealed heat transfer channels on the top of the battery module.

[0020] The heat generated by a single battery cell during operation is conducted to the heat transfer medium through the polar terminals, achieving efficient heat dissipation and effectively reducing the overall temperature of the battery module. This reduces battery performance degradation and lifespan shortening caused by high temperatures, ensuring that the battery module maintains good performance and stability under different operating conditions.

[0021] Furthermore, the clearance opening includes n first clearance holes; the n first clearance holes are arranged at intervals along the first direction, and the n first clearance holes correspond one-to-one with each polarity terminal on the same side of the battery module;

[0022] In each polarity terminal, the first part of the polarity terminal body extends into the inner cavity of the heat transfer tube through the corresponding first clearance hole.

[0023] Compared to a single large, elongated clearance opening, having an independent first clearance hole for each polarity terminal makes sealing between the polarity terminal and the clearance opening much easier. Each hole can be sealed individually, ensuring sealing quality and reducing the risk of heat transfer medium leakage due to incomplete sealing.

[0024] In addition, compared to a single large, elongated clearance opening, setting an independent first clearance hole for each polarity terminal results in better structural stability of the heat transfer tube.

[0025] Furthermore, the aforementioned battery component also includes 2n sealing rings, each sealing ring being fitted onto the first part of the polar terminal body in each polar terminal. The heat transfer tube is welded to the side wall of the first through groove, and when the heat transfer tube is welded to the side wall of the first through groove, the sealing ring is pressed to achieve a seal between the polar terminal and the first clearance hole.

[0026] The sealing ring fitted on the first part of each polar terminal body will undergo elastic deformation when the heat transfer tube is welded to the side wall of the first through groove and the sealing ring is pressed, tightly filling the tiny gap between the polar terminal and the first clearance hole, preventing the heat transfer medium from leaking.

[0027] In a vibrating environment, the sealing ring can absorb some of the stress caused by vibration, preventing damage to the sealing structure due to relative displacement between the polar terminal and the first clearance hole, thus ensuring stable sealing performance under various complex working conditions.

[0028] Furthermore, using sealing rings for sealing is simpler and easier than some complex sealing processes, such as applying special sealant. During manufacturing, simply fitting the sealing ring onto the polarity terminal and then welding the heat transfer tube achieves a good seal. This helps improve production efficiency, reduce manufacturing costs, and also minimizes quality problems that might arise from complex manufacturing processes.

[0029] Furthermore, the heat transfer tubes are electrical conductors, enabling the parallel connection of each individual cell.

[0030] The aforementioned heat transfer tubes not only serve as heat dissipation components but also as electrical conductors to enable parallel connection of multiple individual cells, offering at least the following advantages:

[0031] Firstly, the elimination of the need for additional dedicated conductive connectors simplifies the overall structural design of the battery component. Secondly, since the heat transfer pipe simultaneously performs heat dissipation and conductivity functions, the number of components in the battery component is reduced, lowering assembly difficulty and cost. Thirdly, as a parallel connector, the heat transfer pipe is directly embedded in the first through slot of the polarity terminal, making full use of the space of the polarity terminal and avoiding the space occupation problem of additional conductive connectors. Fourthly, as a parallel connector, the heat transfer pipe can ensure a more uniform current distribution among multiple individual cells, preventing individual cells from overheating and being damaged due to excessive current.

[0032] Furthermore, the electrolyte and / or gas are shared among the individual cells.

[0033] The electrolyte and / or gas inside each individual cell are interconnected, so that the electrolyte and / or gas of all individual cells are in the same system, reducing the differences between individual cells and improving the consistency between individual cells to a certain extent, thereby improving the cycle life of the battery components to a certain extent.

[0034] Furthermore, the battery module also includes a housing; the top plate of the housing has a second clearance hole corresponding to the polarity terminal of each individual battery cell;

[0035] Inside the casing, n individual cells are arranged along a first direction; each polarity terminal body extends out of the corresponding second clearance hole; the second clearance hole is fixedly sealed to the top plate area of ​​the casing and the individual cell casing.

[0036] Furthermore, the top plate of the outer casing is provided with an insulating sealant layer, at least a portion of the structure of the heat transfer tube is located inside the insulating sealant layer, and another portion of the structure is located outside the insulating sealant layer.

[0037] The battery components operate in a complex environment, which may be subject to humidity fluctuations. An insulating sealant encapsulates the heat transfer tube structure, forming a tight seal between the top of the outer casing and the heat transfer tubes. Due to the sealant's excellent sealing properties, it effectively prevents humid air from entering the battery component. Even in high humidity environments, moisture is unlikely to penetrate the insulating sealant layer and reach critical parts of the battery component, thus reducing the possibility of condensation formation at its source.

[0038] The fourth aspect of this utility model provides a battery pack, including n battery components arranged along a second direction; the battery components are those described above.

[0039] In the n battery components, in the outermost battery component along the second direction, the same-side ports of the two heat transfer tubes serve as the total liquid inlet and the total liquid outlet; in the other outermost battery component along the second direction, the same-side ports of the two tubes serve as loop turning nodes; in the remaining ports, the heat transfer tube ports of different battery components are connected in series in a set order.

[0040] After entering the main inlet, the coolant flows through one of the heat transfer tubes of each battery component in sequence, and then through the loop turning point, flows through the other heat transfer tube of each battery component in sequence, and flows out from the main outlet.

[0041] In this invention, the two heat transfer tubes on the same side of an outermost battery component are designated as the main liquid inlet and the main liquid outlet, respectively. The heat transfer tubes of each intermediate battery component are connected in series in a predetermined order. At the same time, the two heat transfer tubes on the same side of another outermost battery component are connected in series as a loop turning point. After the coolant enters the main liquid inlet, it flows through one heat transfer tube (liquid inlet heat transfer tube) in each battery component in sequence. Then, through the loop turning point, it flows through another heat transfer tube (liquid outlet heat transfer tube) in each battery component in sequence and flows out from the main liquid outlet.

[0042] This series-connected fluid path design allows the coolant to flow sequentially through each battery component, carrying away the heat generated by each component. During the coolant flow, each battery component receives relatively even cooling, avoiding temperature differences caused by insufficient or excessive cooling of some components, and achieving uniform temperature distribution across the entire battery pack.

[0043] The beneficial effects of this utility model are:

[0044] 1. This utility model forms a heat transfer medium flow sub-cavity between the polar terminal body and the inner wall of the heat transfer tube, with at least a portion of the polar terminal structure directly contacting the heat transfer medium. After constructing the battery module, heat transfer tubes can be fixed on the polar terminals of each individual battery cell located on the same side, forming a heat transfer channel at the top of the battery module for heat exchange. The partial structure of the battery polar terminal is directly placed within the heat transfer medium flow sub-cavity, allowing direct contact between the polar terminal and the heat transfer medium, achieving heat exchange at the polar terminal. This provides a shorter heat exchange path, and the heat transfer medium acts directly on the polar terminal, improving the utilization efficiency of the heat transfer medium and enhancing the heat exchange efficiency of the battery module.

[0045] 2. In the battery pack, this invention uses the same-side ports of the two heat transfer tubes of the outermost battery component as the main liquid inlet and the main liquid outlet, respectively. The heat transfer tubes of each intermediate battery component are connected in series in a predetermined order. At the same time, the same-side ports of the two heat transfer tubes of the other outermost battery component are connected in series as a loop turning point. After the coolant enters the main liquid inlet, it flows through one heat transfer tube (liquid inlet heat transfer tube) of each battery component in sequence. Then, through the loop turning point, it flows through another heat transfer tube (liquid outlet heat transfer tube) of each battery component in sequence and flows out from the main liquid outlet.

[0046] This series-connected fluid path design allows the coolant to flow sequentially through each battery component, carrying away the heat generated by each component. During the coolant flow, each battery component receives relatively even cooling, avoiding temperature differences caused by insufficient or excessive cooling of some components, and achieving uniform temperature distribution across the entire battery pack. Attached Figure Description

[0047] Figure 1 This is a schematic diagram of the polarity terminal in Example 1;

[0048] Figure 2 This is a cross-sectional view of the polarity terminal in Example 1;

[0049] Figure 3 This is a schematic diagram of the polarity terminal in Example 2;

[0050] Figure 4 This is a cross-sectional view of the polarity terminal in Example 2;

[0051] Figure 5 This is a schematic diagram of the structure of a single cell in Example 3;

[0052] Figure 6 This is a cross-sectional view of a single cell in Example 3;

[0053] Figure 7 This is a schematic diagram of the battery component in Example 4;

[0054] Figure 8This is a schematic diagram of the exploded structure of the battery component in Example 4. Figure 1 ;

[0055] Figure 9 This is a schematic diagram of the exploded structure of the battery component in Example 4. Figure 2 ;

[0056] Figure 10 This is a cross-sectional view of the battery component in Example 4;

[0057] Figure 11 This is a schematic diagram of the heat transfer tube in Example 4;

[0058] Figure 12 This is a schematic diagram of the battery component in Example 6;

[0059] Figure 13 This is a cross-sectional view of the battery component in Example 6;

[0060] Figure 14 This is a cross-sectional view of the battery component in Example 7;

[0061] Figure 15 This is a schematic diagram of the battery pack structure in Example 8. Figure 1 ;

[0062] Figure 16 This is a schematic diagram of the battery pack structure in Example 8. Figure 2 ;

[0063] Figure 17 This is a schematic diagram of one connection method for the heat transfer tubes in the battery pack of Example 8;

[0064] Figure 18 This is a schematic diagram of another connection method for the heat transfer tubes in the battery pack of Example 8;

[0065] The attached figures are labeled as follows:

[0066] 1. Polar terminal; 11. First through groove; 12. First part of polar terminal body; 13. Through hole; 14. Welding part; 2. Single cell; 3. Heat transfer tube; 31. First clearance hole; 32. Heat transfer medium flow sub-cavity; 33. Stepped structure; 4. Battery component; 5. Battery module; 6. Sealing ring; 51. Outer shell; 52. Second clearance hole; 53. Insulating sealant layer; 8. Electrolyte shared chamber; 9. Gas shared chamber; a. Main liquid inlet; b. Main liquid outlet; c. Circuit turning point. Detailed Implementation

[0067] To make the above-mentioned objectives, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of this utility model.

[0068] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0069] In the description of this utility model, it should be noted that the terms "top," "bottom," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0070] This utility model provides a polar terminal, including a polar terminal body, with two first through slots for installing a heat transfer tube on the polar terminal body. The two first through slots penetrate the polar terminal body in a first direction and are arranged along a second direction, wherein the first direction and the second direction are perpendicular.

[0071] For ease of description, in this utility model, the polar terminal body portion located between the two first through slots is defined as the first polar terminal body portion.

[0072] This utility model also provides a single cell battery having the above-mentioned polarity terminals and a battery component having such a single cell battery.

[0073] Each battery component includes a battery module (in which individual cells are arranged along a first direction) and two heat transfer pipes. The two heat transfer pipes extend along the first direction and are arranged along a second direction, respectively fixed in the first through slots of the polarity terminals of the individual cells in the battery module. After the heat transfer pipes are fixed in the first through slots, the first part of the polarity terminal body of each polarity terminal extends into the inner cavity of the heat transfer pipe, with a certain gap between it and the inner wall of the heat transfer pipe, serving as a sub-cavity for the flow of heat transfer medium. The heat transfer medium in the sub-cavity directly acts on the polarity terminal body, improving the utilization efficiency of the heat transfer medium and improving the heat exchange efficiency of the battery module.

[0074] It should be noted that the above-mentioned battery modules can include at least the following three types:

[0075] Type 1 battery module:

[0076] The first type of battery module includes multiple individual battery cells arranged along a first direction;

[0077] For ease of description, in this utility model, the arrangement direction of the individual battery cells is defined as the x-direction; the height direction of the individual battery cells is defined as the z-direction; and the direction perpendicular to both the x and z directions is defined as the y-direction.

[0078] Second type of battery module:

[0079] The second type of battery module adds at least one electrolyte sharing pipeline to the first type of battery module. Based on the electrolyte sharing pipeline, the electrolyte areas inside the cavities of multiple individual cells are connected to achieve electrolyte sharing, reduce the differences between individual cells, and optimize the cycle performance of the battery module. It may also include a gas sharing pipeline, which connects the gas areas inside the cavities of multiple individual cells to achieve gas balance and further optimize the cycle performance of the battery module.

[0080] Third type of battery module:

[0081] The third type of battery module, based on the first type of battery module, adds a shell, with multiple individual batteries arranged along the x-direction and placed inside the shell cavity.

[0082] This utility model does not specifically limit the above-mentioned shell structure, but at least the following two structures can be adopted:

[0083] The first structure includes a cylindrical body with open ends (i.e., the port parallel to the yz plane is the open end) and end plates fixed to the two open ends of the cylindrical body (i.e., the end plates are parallel to the yz plane).

[0084] The second structure includes a cylindrical body with open ends at the top and bottom (i.e., the port parallel to the xy plane is the open end) and a top plate and a bottom plate fixed to the open ends at the top and bottom of the cylindrical body respectively (i.e., the top plate and the bottom plate are both parallel to the xy plane, and the bottom plate or the top plate can be an integral structure with the cylindrical body).

[0085] A shared chamber is provided inside the aforementioned casing, which enables the connection of the internal cavities of each individual battery cell.

[0086] It should be noted that:

[0087] The aforementioned shared chamber can be an electrolyte sharing chamber, with its inner cavity connected to the inner cavities of each individual battery cell. This shared chamber ensures that each individual battery cell is in a uniform electrolyte environment, guaranteeing electrolyte homogeneity and improving the battery module's performance and charge-discharge cycle life. The electrolyte sharing chamber described here is a liquid channel extending along the length of the casing between the casing's bottom plate and each individual battery cell. This liquid channel can be integrally formed with the casing's bottom plate or formed by a support structure between the individual battery's lower cover and the casing's bottom plate. It should be noted that in the first type of casing structure, the casing's bottom plate here is a cylindrical bottom plate; in the second type of casing structure, the casing's bottom plate here is a base plate.

[0088] The aforementioned shared chamber can also be a gas-sharing chamber located on the top plate of the outer casing, covering the gas ports on the top of each individual battery cell in the battery module.

[0089] It should be noted that in the first type of shell structure, the top plate of the shell here is the top plate of the cylinder; in the second type of shell structure, the top plate of the shell here is the top plate.

[0090] It should also be noted that the gas port here has the following two meanings:

[0091] 1) The gas port is a through hole directly opened on the top cover of the single cell and penetrating the inner cavity of the single cell;

[0092] At this time, the gas-sharing chamber is connected to the gas area of ​​each individual cell through the gas port. Based on the gas-sharing chamber, the gas areas of each individual cell can be connected to achieve gas balance, so that the gas of each individual cell is shared to ensure the consistency of each individual cell and improve the cycle life of the battery module to a certain extent. When any individual cell experiences thermal runaway, the flue gas in the inner cavity of that individual cell enters the gas-sharing chamber and is discharged through the gas-sharing chamber, improving the safety of the battery module.

[0093] 2) The gas port is a vent or explosion-proof port installed on the top cover of the individual battery, and a vent membrane is provided at the vent or explosion-proof port.

[0094] At this time, the gas sharing chamber is used as a venting channel. When the venting membrane at the gas port of any single battery cell is ruptured by the flue gas in the inner cavity, the inner cavity of that single battery cell and the gas sharing chamber are connected, and the flue gas inside is discharged through the gas sharing chamber, thereby improving the safety of the battery module.

[0095] The aforementioned shared chamber can also be a gas-liquid shared chamber. Through a gas-liquid shared chamber, each individual battery cell can be placed in a unified electrolyte environment and gas environment, thereby improving the performance of the battery module and its charge-discharge cycle life.

[0096] A second clearance hole is made on the top plate of the outer casing corresponding to the polarity terminal of each individual battery; each polarity terminal extends out of the corresponding second clearance hole, and the area of ​​the top plate of the outer casing corresponding to the second clearance hole is fixedly sealed with the outer casing of the individual battery, so that the second clearance hole area is sealed.

[0097] It should be noted that:

[0098] The area on the top plate of the outer casing corresponding to the second clearance hole can be the area around the second clearance hole on the top plate of the outer casing, or it can be the wall of the second clearance hole.

[0099] This utility model also discloses a battery pack, which is mainly composed of multiple battery components mentioned above. By optimizing the connection method of the heat transfer pipes between each battery component, uniform heat dissipation of the polar terminals of individual batteries in each battery component of the battery pack is achieved, avoiding the occurrence of thermal runaway problems caused by excessive local heat at the polar terminals.

[0100] In traditional designs, heat transfer tubes are typically connected end-to-end in the same direction. As the coolant flows from the main inlet to the main outlet, it continuously heats up, resulting in a lower temperature at the polar terminals of the battery modules near the main inlet and a higher temperature at the main outlet. This temperature difference significantly affects the performance and lifespan of the battery pack. While parallel connection of heat transfer tubes can mitigate the temperature difference problem to some extent, the piping layout becomes extremely complex, increasing design and maintenance costs and reducing system reliability.

[0101] To address the aforementioned issues, this invention uses the same-side ports of two heat transfer tubes in one outermost battery component as the main inlet and outlet; in another outermost battery component, the same-side ports of two heat transfer tubes serve as loop transition nodes; the remaining ports of all heat transfer tubes are connected in series in a predetermined order from the heat transfer tube ports of different battery components, forming a complete liquid circulation system. Driven by a circulating pump, the coolant enters from the main inlet and flows sequentially through one heat transfer tube in each battery component, absorbing heat. Subsequently, it flows through the loop transition node and then sequentially through the other heat transfer tube in each battery component, further absorbing heat from the other polarity terminal, before exiting from the main outlet. During this circulation process, each battery component receives relatively uniform cooling, effectively avoiding temperature differences caused by insufficient or excessive cooling of some battery components, and achieving a uniform temperature distribution across the entire battery pack.

[0102] In addition, the system only requires a pair of main inlet / outlet liquid ports to achieve the cooling cycle of the entire battery pack. Moreover, the main inlet / outlet liquid ports are located on the same side of the two heat transfer tubes of the same battery component, which greatly simplifies the piping layout, reduces the complexity of the system, and improves reliability.

[0103] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0104] Example 1

[0105] like Figure 1 and Figure 2 The figures shown are a schematic diagram and a cross-sectional view of the polar terminal 1 in this embodiment.

[0106] As can be seen from the figure, in this embodiment, the polar terminal 1 is designed as a rectangular block structure. The length, width and height of the rectangular block can be customized according to the actual application scenario to adapt to different battery specifications.

[0107] In some other embodiments, a cylindrical polar terminal 1 may also be used.

[0108] The polar terminal 1 includes a polar terminal body, on which two parallel first through slots 11 are formed. The first through slots 11 penetrate the polar terminal body in the x direction, and the two first through slots 11 are arranged at intervals in the y direction.

[0109] The shape of the cross-section of the first channel 11 mainly conforms to the shape of the heat transfer tube 3 embedded in the wall of the first channel 11. It should be noted that the cross-section mentioned here is the cross-section obtained by cutting the first channel 11 along a plane perpendicular to the first direction. For example, as can be seen from the figure, the cross-section of the first channel 11 in this embodiment is rectangular, and correspondingly, the cross-section of the heat transfer tube 3 embedded in the wall of the first channel 11 is also rectangular, for example, it can be a rectangular tube. In some other embodiments, the cross-section of the first channel 11 can be arc-shaped, and correspondingly, the cross-section of the heat transfer tube 3 embedded in the wall of the first channel 11 is also arc-shaped, for example, a tube with a semi-circular cross-section can be used.

[0110] The width of the first through groove 11 (in the y direction) needs to ensure that the wall of the corresponding heat transfer tube 3 can be embedded, and there is a certain gap between the inner wall of the heat transfer tube 3 and the first part 12 of the polar terminal body to allow the heat transfer medium to flow.

[0111] In this embodiment, the polar terminal 1 can be made of a metal material with good electrical and thermal conductivity, such as silver, copper, aluminum, etc. However, considering the cost and the electrical and thermal conductivity, aluminum is generally chosen as the material for the polar terminal 1, and it can be integrally formed by aluminum extrusion process.

[0112] To improve the connection stability between the heat transfer tube and the polarity terminal 1, this embodiment provides a welding part 14 on the side wall of the first through groove 11, which is then welded and fixed to the heat transfer tube 3. Here, the side wall of the first through groove 11 is the side wall of the first through groove 11 away from the first part 12 of the polarity terminal body.

[0113] Specifically, there are two feasible welding methods. First, a large area of ​​the sidewall of the first through-slot 11 can be used as the welding part 14, and through-welded to the heat transfer pipe 3 to form a strong connection, effectively enhancing the bonding strength and heat conduction performance of both. Second, the top of the sidewall of the first through-slot 11 (a continuous plane extending along the first direction) can be used as the welding part 14. Welding can be performed along the contact area between the top of the sidewall of the first through-slot 11 and the wall of the heat transfer pipe 3, ensuring a uniform and continuous weld, thereby achieving a tight connection between the two.

[0114] Welding allows for a tight connection between the heat transfer tube 3 and the polarity terminal 1. Compared to other connection methods, such as simple mechanical fixing, welding eliminates tiny gaps at the connection point, significantly reducing thermal resistance and greatly improving the heat transfer efficiency between the two, ensuring effective heat transfer. Simultaneously, welding enhances the connection stability, preventing the heat transfer tube 3 from separating from the polarity terminal 1 due to vibration, impact, or other factors during battery component 4 operation. This avoids affecting heat dissipation and ensures the continuous and stable operation of battery component 4.

[0115] Example 2

[0116] To further improve the heat transfer performance of the aforementioned polarity terminal 1, such as Figure 3 and Figure 4 As shown, this embodiment, based on embodiment 1, includes a through hole 13 on the polar terminal body, with the through hole 13 penetrating the polar terminal body along a first direction. In practical applications, the size and number of through holes 13 can be flexibly adjusted according to specific needs, provided that the conductivity of the polar terminal 1 is not affected. The through hole 13 increases the contact area between the polar terminal body and the heat transfer medium, thereby significantly improving heat transfer efficiency. When the heat transfer medium flows through the polar terminal body, it can more fully surround the polar terminal body through the through hole 13. Previously, the heat transfer medium could only exchange heat with the surface of the polar terminal body; now, internal heat exchange can be achieved through the through hole 13, which greatly increases the amount of heat transferred per unit time and accelerates the heat removal speed of the polar terminal 1.

[0117] In other embodiments, other structures may be processed on the outer wall of the first part 12 of the polar terminal body to increase the heat exchange area. For ease of description, in this utility model, the structures that can increase the heat exchange area are collectively referred to as functional structures. Such functional structures may include dot-shaped pits and protrusions on the outer wall of the first part 12 of the polar terminal body, annular grooves on the outer wall of the first part 12 of the polar terminal body, and through grooves on the first part 12 of the polar terminal body.

[0118] When the functional structure is a through hole 13 or through groove that runs through the first part 12 of the polar terminal body along the first direction, the polar terminal 1 can still be integrally formed by aluminum extrusion process.

[0119] Example 3

[0120] like Figure 5 and Figure 6 As shown, this is a single-cell battery 2 having the polarity terminal 1 described in the above embodiment. Figure 5 and Figure 6 Taking the polar terminal 1 in Embodiment 2 as an example, the polar terminal 1 serves as the terminal of the single cell 2 and is directly electrically connected to the tab of the electrode assembly inside the casing of the single cell 2.

[0121] Example 4

[0122] This embodiment describes a battery component 4, which includes a battery module 5 and two heat transfer pipes 3. The battery module 5 in this embodiment is the first type of battery module described above.

[0123] The specific structure is as follows: Figures 7 to 10 As shown in the figure, the battery module 5 in this embodiment includes 12 individual battery cells 2 from embodiment 3 arranged along the x-direction. In other embodiments, the number of individual battery cells 2 can be adjusted according to actual needs. The positive terminals 1 of the 12 individual battery cells 2 are arranged on one side, forming the total positive terminal of the battery module 5; the negative terminals 1 of the 12 individual battery cells 2 are arranged on the other side, forming the total negative terminal of the battery module 5. In some other embodiments, the arrangement of the polarity terminals 1 of the individual battery cells 2 can be adjusted according to the overall capacity requirements of the battery module 5 to adjust the series and parallel connection method of each individual battery cell 2.

[0124] Each heat transfer tube 3 extends along a first direction, and two heat transfer tubes 3 are arranged along a second direction, respectively embedded in the first through slot 11 of each polarity terminal 1 located on different sides. In this embodiment, one heat transfer tube 3 is embedded in the first through slot 11 of the total positive terminal of the battery module 5, and the other heat transfer tube 3 is embedded in the first through slot 11 of the total negative terminal of the battery module 5.

[0125] When the heat transfer tube 3 is inserted into the first through groove 11, the first part 12 of the polar terminal body of each polar terminal 1 extends into the inner cavity of the heat transfer tube 3 through the polar terminal 1 clearance opening opened on the tube wall of the heat transfer tube 3. At the same time, a certain gap is reserved between the first part 12 of the polar terminal body and the inner wall of the heat transfer tube 3 as a heat transfer medium flow sub-cavity 32; in order to prevent the heat transfer medium in the heat transfer medium flow sub-cavity 32 from overflowing, it is necessary to seal the polar terminal 1 and the polar terminal 1 clearance opening.

[0126] Sealing measures can be implemented using sealants that are resistant to high temperatures and corrosion and have good insulation properties, or by installing sealing rings or gaskets, to ensure the stable flow of the heat transfer medium within the closed sub-cavity.

[0127] Specifically, appropriate sealing measures can be selected based on the structure of the clearance opening, so as to... Figure 11 Taking the structure of the heat transfer tube 3 in this embodiment as an example, its clearance is 12 first clearance holes 31 opened on the tube wall of the heat transfer tube 3; the 12 first clearance holes 31 are arranged at intervals along the x direction, and the 12 first clearance holes 31 correspond one-to-one with each polarity terminal 1 on the same side of the battery module 5.

[0128] Corresponding to the above-mentioned clearance structure, such as Figures 8 to 10 In this embodiment, a sealing measure is adopted by installing a sealing ring 6.

[0129] The specific installation steps are as follows: First, a sealing ring 6 is fitted onto the first part 12 of the polar terminal body of each polar terminal 1. Preferably, in the x-direction, the polar terminals 1 extend out from both sides of the sealing ring 6, and in the z-direction, the bottom of the sealing ring 6 is in close contact with the bottom of the first through groove 11, and the bottom of the extended polar terminal 1 is in close contact with the top cover of the single battery 2. This arrangement can stabilize the position of the sealing ring 6 and prevent the sealing ring 6 from shifting during installation, thus affecting the sealing effect. Next, pick up two heat transfer tubes 3, one corresponding to the positive terminal side of the battery module 5 and the other corresponding to the negative terminal side. Align the heat transfer tube 3 with the first through groove 11 on the corresponding side and insert it into the first through groove 11. During this process, it is necessary to ensure that the first part 12 of the polar terminal body fitted with the sealing ring 6 on each polar terminal 1 extends into the first clearance hole 31 on the heat transfer tube 3 one-to-one. During the insertion process, the action should be smooth to prevent the heat transfer tube 3 from colliding with the polar terminal 1 and damaging the sealing ring 6 or causing the sealing ring 6 to shift. After the heat transfer tube 3 is initially embedded in the first through groove 11, welding is performed between the heat transfer tube 3 and the side wall of the first through groove 11. As welding progresses, the heat transfer tube 3 gradually fuses with the side wall of the first through groove 11. During this process, the pressure generated by welding exerts a uniform and continuous squeezing effect on the sealing ring 6 fitted on the first part 12 of the polar terminal body. After being squeezed, the sealing ring 6 undergoes elastic deformation, tightly filling the tiny gap between the polar terminal 1 and the first clearance hole 31, thereby achieving an efficient and reliable seal and effectively preventing the heat transfer medium in the flow cavity 32 from overflowing.

[0130] The aforementioned sealing ring 6 offers several advantages in battery modules. Under complex operating conditions, especially in vibrating environments, the sealing ring can absorb some of the stress generated by vibration, preventing damage to the sealing structure due to relative displacement between the polar terminal and the first clearance hole, thus ensuring stable sealing performance. From a structural stability perspective, when the battery module vibrates or is subjected to external impacts, the sealing ring acts as a buffer between the polar terminal and the heat transfer tube, dispersing and absorbing some stress, reducing the direct impact force of the polar terminal on the heat transfer tube, lowering the risk of material fatigue and damage to the heat transfer tube due to localized stress concentration, improving its overall structural stability, and extending its service life. In terms of manufacturing, using a sealing ring is simpler and easier than some complex sealing processes, such as applying special sealant. During manufacturing, simply fitting the sealing ring onto the polar terminal and then welding the heat transfer tube achieves a good sealing effect, helping to improve production efficiency, reduce manufacturing costs, and minimize quality problems caused by complex processes.

[0131] In some other embodiments, the clearance opening may also be an elongated clearance hole formed on the wall of the heat transfer tube. The elongated clearance hole extends along the first direction, and the first part 12 of the polar terminal body of each polar terminal 1 extends into the inner cavity of the heat transfer tube 3 through the elongated clearance hole.

[0132] Corresponding to the above-mentioned clearance structure, a sealing gasket can be used as a sealing measure. This type of sealing gasket has 12 third clearance holes arranged at intervals along the first direction; the 12 third clearance holes correspond one-to-one with each polarity terminal 1 on the same side of the battery module 5.

[0133] During installation: First, lay the two sealing gaskets in the first through-groove 11 of the different polarity terminals 1, ensuring that the first part 12 of the polarity terminal body on each polarity terminal 1 protrudes through the third clearance hole on the corresponding sealing gasket. During installation, ensure that the bottom of the sealing gasket is tightly fitted to the bottom of the first through-groove 11 and the top cover of the individual battery 2. Next, take two heat transfer tubes 3, one corresponding to the positive terminal side of the battery module 5 and the other to the negative terminal side. Align the heat transfer tubes 3 with the corresponding first through-groove 11 and insert them into the first through-groove 11, ensuring that the first part 12 of the polarity terminal body on each polarity terminal 1 extends into the elongated clearance hole on the heat transfer tube 3. After the heat transfer tubes 3 are initially inserted into the first through-groove 11, weld the heat transfer tubes 3 to the sidewall of the first through-groove 11. As welding progresses, the heat transfer tube 3 gradually fuses with the sidewall of the first through groove 11. During this process, the pressure generated by welding exerts a uniform and continuous squeezing effect on the sealing gasket fitted on the first part 12 of the polar terminal body. After being squeezed, the sealing gasket undergoes elastic deformation, tightly filling the tiny gap between the polar terminal 1 and the first clearance hole 31, thus achieving an efficient and reliable seal and effectively preventing the heat transfer medium in the flow cavity 32 from overflowing.

[0134] In this embodiment, for a heat transfer tube 3 on the same side, the heat transfer medium flows in from one end of the heat transfer tube 3, flows sequentially through the sub-cavities surrounding the first portion 12 of all polar terminal bodies within the inner cavity of the heat transfer tube 3, and flows out from the other end of the heat transfer tube 3. A portion of the structure of the battery polar terminal 1 is directly placed inside the heat exchange channel. The polar terminal 1 is in direct contact with the heat transfer medium. In conventional heat exchange methods, heat needs to pass through multiple levels of transfer to achieve exchange. However, in this embodiment, the polar terminal 1 is directly connected to the heat transfer medium, allowing the heat transfer medium to act directly on the polar terminal 1 without energy loss in other intermediate stages, significantly improving the utilization efficiency of the heat transfer medium. This means that the same amount of heat transfer medium can play a greater role in heat transfer, greatly improving the efficiency of heat transfer. While improving the utilization efficiency of the heat transfer medium, the overall heat exchange efficiency of the battery module 5 is also greatly improved. The problem that might have caused battery performance degradation due to untimely heat exchange is solved by this efficient heat exchange design, thus ensuring that battery module 5 is always in good working condition, extending the service life of battery module 5 and improving its working stability.

[0135] In this embodiment, the heat transfer tube 3 can be an electrical conductor, and the material can be a high-purity aluminum alloy, such as 6063 aluminum alloy. This material has good electrical conductivity, with a conductivity of 30-35 MS / m at 20℃, which can meet the requirements for current conduction; at the same time, it has excellent thermal conductivity, with a thermal conductivity of about 200-230 W / (m·K), which can efficiently achieve heat dissipation.

[0136] In this embodiment, the polar terminals 1 on the same side of the battery component 4 have the same polarity, and the polar terminals 1 on different sides have opposite polarities. Two heat transfer tubes 3 are fixed on the polar terminals 1 on both sides respectively, so as to realize the parallel connection of multiple single cells 2.

[0137] Therefore, in this embodiment, the heat transfer pipe 3 not only serves as a heat dissipation component but also as an electrical conductor to realize the parallel connection of multiple individual cells 2, which has at least the following advantages:

[0138] Firstly, the elimination of the need for dedicated conductive connectors simplifies the overall structure of battery component 4. In traditional battery modules 5, heat dissipation and conductivity are often handled by different components, requiring complex structural layouts and connection designs. In this embodiment, the heat transfer pipe 3 integrates both heat dissipation and conductivity functions, reducing the need for dedicated conductive connectors and making the overall structure of battery component 4 more concise and compact, thus reducing design complexity and the probability of errors.

[0139] Secondly, since the heat transfer pipe 3 simultaneously performs both heat dissipation and electrical conductivity functions, the number of components in the battery component 4 is reduced, thus lowering the assembly difficulty and cost. Previously, separate heat dissipation pipes and conductive connectors were used, resulting in a large number of components, increased procurement costs, and requiring precise installation of each part during assembly, demanding high skill levels from assembly workers and leading to long assembly times.

[0140] Thirdly, the heat transfer tube 3, as a parallel connector, is directly embedded in the first through slot 11 of the polar terminal 1, making full use of the space of the polar terminal 1 and avoiding the problem of additional conductive connectors occupying space, which is conducive to improving the integration of the battery component 4.

[0141] Fourthly, the heat transfer pipe 3, as a parallel connector, ensures a more uniform current distribution among the multiple individual batteries 2, preventing individual batteries from overheating and being damaged due to excessive current. The heat transfer pipe 3 is made of uniform material and has good conductivity; when used as a parallel connector, its resistance characteristics are consistent. According to electrical principles, current will be evenly distributed along paths with the same resistance. Therefore, after multiple individual batteries 2 are connected in parallel through the heat transfer pipe 3, the current can flow evenly to each individual battery 2, avoiding excessive current in individual batteries due to uneven current distribution, which could lead to overheating and damage. This effectively improves the overall performance and stability of the battery module 5.

[0142] To improve the connection stability between heat transfer tube 3 and polarity terminal 1, and to ensure efficient heat conduction and uniform current transfer, this embodiment optimizes the structure of heat transfer tube 3, such as... Figure 10 As shown, a stepped structure 33 is provided on the outer wall of the heat transfer tube 3 along its length. The horizontal surface of the stepped structure 33 is flush with the top of the side wall of the first through groove 11. The stepped structure 33 is welded to the joint between the horizontal surface of the stepped structure 33 and the top of the side wall of the first through groove 11.

[0143] It should be noted that the horizontal plane of the aforementioned stepped structure 33 refers to the connection surface between the large-diameter section and the small-diameter section of the heat transfer tube 3 in the z-direction.

[0144] A stepped structure 33 is provided on the outer wall of the heat transfer tube 3, and the horizontal plane of the stepped structure 33 is flush with the top of the side wall of the first through groove 11. At the same time, the joint is welded together, which has at least the following advantages:

[0145] Improved stability: The stepped structure 33 provides a larger welding contact area, making the welded connection more robust, reducing the risk of connection loosening due to vibration, and improving the overall stability of the battery component 4.

[0146] Optimize thermal conductivity and electrical conductivity: The horizontal plane of the stepped structure 33 is flush with the top of the side wall of the first through groove 11, ensuring a tighter contact between the heat transfer tube 3 and the polar terminal 1, reducing the tiny gaps between the contact interfaces, significantly reducing thermal resistance, and improving thermal conductivity. At the same time, the tight contact between the two significantly reduces the contact resistance, allowing the current to be evenly distributed between the heat transfer tube 3 and the polar terminal 1, avoiding local current concentration or hot spots caused by poor contact.

[0147] Furthermore, during the welding process, conventional welding operations may damage the structure of the heat transfer tube 3 due to factors such as high temperature and stress concentration, thus leading to potential leakage. The stepped structure 33, however, has a horizontal plane flush with the top of the sidewall of the first through groove 11, providing an ideal operating plane for laser welding along the z-direction. This effectively avoids leakage problems caused by damage to the heat transfer tube 3 structure during the welding process. When the heat transfer medium (such as coolant) flows inside the heat transfer tube 3, this design effectively prevents leakage of the heat transfer medium from the joint.

[0148] Example 5

[0149] Unlike the above embodiments, this embodiment uses the second type of battery module, that is, an electrolyte sharing pipeline is set at the bottom of the battery module 5 in the above embodiments. The inner cavity of the electrolyte sharing pipeline is connected to the electrolyte area of ​​each individual battery cell 2, so as to realize electrolyte sharing, reduce the difference between each individual battery cell 2, and optimize the cycle performance of the battery component 4.

[0150] Example 6

[0151] This embodiment uses another battery component 4, such as... Figure 12 and Figure 13 As shown, unlike the above embodiments, the battery module 5 in this embodiment is a third type of battery module.

[0152] In this embodiment, the third type of battery module arranges 12 individual batteries 2 in the inner cavity of the outer casing 51, and each polar terminal 1 is located outside the outer casing 51. A heat transfer tube 3 is fixed on the polar terminal 1 located on the same side. The structure of the polar terminal 1 and the heat transfer tube 3 is the same as in the above embodiment, and will not be described again here.

[0153] A support extending in the x-direction is provided between the base plate of the outer casing 51 and each individual battery cell 2 to form a liquid channel, serving as an electrolyte sharing chamber 8.

[0154] The top plate of the outer casing 51 may also be provided with a boss extending in the x direction, and a gas channel is opened on the boss, which serves as a gas sharing chamber 9.

[0155] In this embodiment, the assembly of battery component 4 can be achieved through the following process:

[0156] First, place 12 individual batteries 2 inside the housing 51, so that each polarity terminal 1 extends out of the corresponding second clearance hole 52, and fix and seal the top plate of the housing 51 corresponding to the second clearance hole 52 to the housing body of the individual battery 2.

[0157] In this embodiment, the edge of the second clearance hole 52 near the single cell 2 is welded to the upper cover plate of the single cell 2 to achieve a sealed connection. When there is a certain gap between the two, solder can be filled in the gap and welded to avoid the external environment from interfering with the internal environment of the large-capacity battery through the gap between the second clearance hole 52 and the terminal post.

[0158] In addition to the welding method used in this embodiment, in some other embodiments, laser welding can also be used to weld the area around each second clearance hole 52 on the top plate of the outer casing 51 and the area around the electrode post on the upper cover of the corresponding single cell 2. However, this welding method requires a high top plate wall thickness (a thicker top plate may result in poor welding effect, while a thinner top plate may result in high temperature damage to the inside of the single cell 2).

[0159] Then, the heat transfer tube is fixed to the polar terminal 1 in the same way as in Example 1, and will not be described again here.

[0160] Example 7

[0161] This embodiment is based on embodiment 6, such as Figure 14 As shown, an insulating sealant layer 53 is laid on the top plate of the outer casing 51.

[0162] The insulating sealant layer 53 covers at least a portion of the structure of the heat transfer tube 3 and the polar terminal 1, with the top of the heat transfer tube 3 exposed, which can serve as an electrical connection.

[0163] During the operation of the battery component, internal temperature changes may cause water vapor condensation. The insulating sealant layer 53 can isolate external moisture, reduce internal humidity changes, and prevent water droplets from forming on the surfaces of the heat transfer tube 3 and polar terminal 1, thus preventing short circuits and component corrosion caused by condensation. In addition, encasing the heat transfer tube 3 and polar terminal 1 within the structure makes the connections between components tighter, reducing relative displacement between components under vibration, impact, and other conditions, and enhancing the structural stability of the entire battery component.

[0164] In addition, the insulating sealant penetrates into the sealing ring 6, which can further improve the sealing between the polarity terminal 1 and the clearance of the polarity terminal 1.

[0165] Example 8

[0166] This embodiment is a battery pack, such as Figure 15 and Figure 16The figures shown are schematic diagrams of the battery pack from different perspectives in this embodiment, including four battery components 4 arranged along the y-direction as described in the above embodiment. In other embodiments, the number of battery components 4 can be adjusted according to actual needs.

[0167] Figure 15 and Figure 16 Taking the battery component 4 in Example 6 as an example.

[0168] Combination Figure 15 , Figure 16 , Figure 17 and Figure 18 As can be seen, in this embodiment of the battery pack, each heat transfer tube 3 adopts the following two series connection methods:

[0169] The first type of series connection: such as Figure 17 As shown, taking a battery pack consisting of three battery components 4 as an example, the two straight lines extending along the x-direction at the top represent the two heat transfer tubes 3 in one battery component 4, the two straight lines extending along the x-direction in the middle represent the two heat transfer tubes 3 in the second battery component 4, and the two straight lines extending along the x-direction at the bottom represent the two heat transfer tubes 3 in the third battery component 4.

[0170] In each of the two heat transfer tubes 3 of a battery component 4, the upper one can be the heat transfer tube 3 fixed to the total positive terminal, and the lower one can be the heat transfer tube 3 fixed to the total negative terminal.

[0171] Setting of main liquid inlet and main liquid outlet: In the y-direction, select one of the outermost battery components 4, and set the ports on the same side of its two heat transfer pipes 3 as the main liquid inlet and main liquid outlet respectively (a in the figure is the main liquid inlet, and b is the main liquid outlet). The coolant enters the system through the main liquid inlet, and flows out through the main liquid outlet after heat exchange.

[0172] Loop turning point setting: In the y direction, the two heat transfer pipes 3 of the outermost battery component 4 are connected in series on the same side, and the connected part is used as the loop turning point (as shown in c in the figure) to guide the coolant to change the flow direction and form a complete circulation path.

[0173] Remaining port connection rules (here, remaining ports refer to the ports remaining after removing the ports on the same side of the two heat transfer pipes 3 of one outermost battery component 4 and the ports on the same side of the two heat transfer pipes 3 of the other outermost battery component 4):

[0174] At the main inlet and main outlet of the battery pack ( Figure 17On the left side of the middle battery component 4, among the four heat transfer tubes 3 arranged along the y-direction, the ports of two heat transfer tubes 3 that are alternately positioned are connected in series; that is, two ports that are separated by one port are connected in series. Assuming that the ports of the four heat transfer tubes 3 are A1, B1, C1, and D1 respectively, then A1 and C1, and B1 and D1 are connected in series.

[0175] On the other side, that is, the side opposite to or away from the main inlet and main outlet ( Figure 17 On the right side of the middle section, among the four heat transfer pipes 3 arranged along the y-direction on every two adjacent battery components 4, the ports of the two heat transfer pipes 3 that are alternately positioned are connected in series. Assuming that the ports of the four heat transfer pipes 3 are A2, B2, C2, and D2 respectively, then A2 and C2, and B2 and D2 are connected in series.

[0176] After completing the above connections, the coolant should be supplied according to... Figure 17 The coolant flows in the direction indicated by the middle arrow. It enters the system from the main inlet, passes through one heat transfer pipe 3 of the uppermost battery component 4, one heat transfer pipe 3 of the middle battery component 4, and one heat transfer pipe 3 of the lowermost battery component 4 in sequence. After passing through the loop turning point, it passes through another heat transfer pipe 3 of the lowermost battery component 4, another heat transfer pipe 3 of the middle battery component 4, and another heat transfer pipe 3 of the uppermost battery component 4 in sequence, and flows out from the main outlet, forming a complete circulation path within the system.

[0177] The coolant flows into the system from the main inlet and flows orderly through one heat transfer pipe 3 of each battery component 4, absorbing heat and gradually increasing in temperature. When the coolant reaches the loop turning point, the flow direction changes, and it flows sequentially through another heat transfer pipe 3 of each battery component 4. Because the two heat transfer pipes 3 are arranged in parallel, the inlet / outlet temperature difference of each battery component 4 is basically the same, promoting temperature uniformity.

[0178] The second type of series connection: such as Figure 18 As shown, taking a battery pack comprising three battery components 4 as an example, and... Figure 17 Similarly, the two straight lines extending along the x-direction at the top represent the two heat transfer tubes 3 in one battery component 4, the two straight lines extending along the x-direction in the middle represent the two heat transfer tubes 3 in the second battery component 4, and the two straight lines extending along the x-direction at the bottom represent the two heat transfer tubes 3 in the third battery component 4.

[0179] Setting of main inlet, main outlet and loop turning points Figure 17 same:

[0180] Setting of main liquid inlet and main liquid outlet: In the y-direction, select one of the outermost battery components 4, and set the ports on the same side of its two heat transfer pipes 3 as the main liquid inlet and main liquid outlet respectively (a in the figure is the main liquid inlet, and b is the main liquid outlet). The coolant enters the system through the main liquid inlet, and flows out through the main liquid outlet after heat exchange.

[0181] Loop turning point setting: In the y direction, the two heat transfer pipes 3 of the outermost battery component 4 are connected in series on the same side, and the connected part is used as the loop turning point (as shown in c in the figure) to guide the coolant to change the flow direction and form a complete circulation path.

[0182] The rules for connecting to the remaining ports are different. Figure 17 :

[0183] At the main inlet and main outlet of the battery pack ( Figure 18 As shown on the left), on each pair of adjacent battery components 4, the ports of the four heat transfer tubes 3 arranged along the y direction are connected in series, and the ports of the two heat transfer tubes 3 located on the outer side are also connected in series. Assuming that the ports of the four heat transfer tubes 3 are A3, B3, C3, and D3 respectively, then A3 and D3, and B3 and C3 are connected in series.

[0184] On the other side, that is, the side opposite to the main inlet and main outlet ( Figure 18 As shown on the right side, on every two adjacent battery components 4, among the four heat transfer pipes 3 arranged along the y-direction, the ports of the two adjacent heat transfer pipes 3 are connected in series, and the ports of the two outer heat transfer pipes 3 are connected in series. Assuming the ports of the four heat transfer pipes 3 are A4, B4, C4, and D4 respectively, then A4 and D4, and B4 and C4 are connected in series.

[0185] contrast Figure 17 and Figure 18 It can be seen that, compared to Figure 17 , Figure 18 As shown, there are no intersecting pipes, making the connection relatively simple.

Claims

1. A polar terminal, characterized in that: It includes a polar terminal body, on which two first through slots are provided. The two first through slots are arranged along a second direction, and each first through slot penetrates the polar terminal body along a first direction. The polar terminal body portion between the two first through slots is defined as the first portion of the polar terminal body; Two first through slots are used to cooperate with the heat transfer tube to form a heat transfer medium flow cavity between the first part of the polar terminal body and the inner wall of the heat transfer tube; wherein the first direction and the second direction are perpendicular.

2. The polar terminal according to claim 1, characterized in that: The first part of the polar terminal body is provided with a functional structure for increasing the heat exchange area.

3. The polar terminal according to claim 2, characterized in that: The functional structure is a through hole, which extends through the first part of the polarity terminal body in the first direction to allow the heat transfer medium to pass through.

4. The polar terminal according to any one of claims 1 to 3, characterized in that: The first through groove has a welding part on its side wall away from the first part of the polar terminal body, and the welding part is used to weld and fix it to the heat transfer tube.

5. A single-cell battery, characterized in that: Includes an electrode assembly and a polar terminal as described in any one of claims 1 to 4 connected to the electrode assembly tab.

6. A battery component, characterized in that: Includes a battery module and two heat transfer pipes; The battery module includes n individual batteries arranged along a first direction; wherein, the individual battery is the individual battery as described in claim 5, and n is an integer greater than 1; Each heat transfer tube has a polarity terminal clearance opening on its tube wall; Each heat transfer tube extends along a first direction, and two heat transfer tubes are arranged along a second direction, respectively embedded in the first through slots of each polarity terminal located on different sides. The first part of the polarity terminal body in each polarity terminal extends into the inner cavity of the heat transfer tube through the polarity terminal clearance port. The polarity terminal and the polarity terminal clearance port are sealed, forming a heat transfer medium flow sub-cavity between the inner wall of the heat transfer tube and the first part of the polarity terminal body in each polarity terminal.

7. The battery component according to claim 6, characterized in that: The clearance includes n first clearance holes; the n first clearance holes are arranged at intervals along a first direction, and the n first clearance holes correspond one-to-one with each polarity terminal on the same side of the battery module; In each polarity terminal, the first part of the polarity terminal body extends into the inner cavity of the heat transfer tube through the corresponding first clearance hole.

8. The battery component according to claim 7, characterized in that: It also includes 2n sealing rings, each of which is fitted onto the first part of the polar terminal body in each polar terminal. The heat transfer tube is welded to the side wall of the first through groove, and when the heat transfer tube is welded to the side wall of the first through groove, the sealing ring is pressed to achieve a seal between the polar terminal and the first clearance hole.

9. The battery component according to claim 6, characterized in that: The heat transfer tubes are electrical conductors, enabling the parallel connection of individual cells.

10. The battery component according to any one of claims 6 to 9, characterized in that: The electrolyte and / or gas are shared among the individual cells.

11. The battery component according to claim 10, characterized in that: The battery module also includes a housing; the top plate of the housing has a second clearance hole corresponding to the polarity terminal of each individual battery cell. Inside the casing of n individual cells arranged along the first direction; each polarity terminal body extends out of the corresponding second clearance hole; The second clearance hole corresponds to the area of ​​the top plate of the outer casing and is fixedly sealed to the individual battery casing.

12. The battery component according to claim 11, characterized in that: The top plate of the outer casing is provided with an insulating sealant layer, at least a portion of the structure of the heat transfer tube is located inside the insulating sealant layer, and another portion of the structure is located outside the insulating sealant layer.

13. A battery pack, characterized in that: It includes n battery components arranged along a second direction; the battery components are the battery components according to any one of claims 6 to 12; In the n battery components, in the outermost battery component along the second direction, the same-side ports of the two heat transfer tubes serve as the total liquid inlet and the total liquid outlet; in the other outermost battery component along the second direction, the same-side ports of the two tubes serve as loop turning nodes; in the remaining ports, the heat transfer tube ports of different battery components are connected in series in a set order. After entering the main inlet, the coolant flows through one of the heat transfer tubes of each battery component in sequence, and then through the loop turning point, flows through the other heat transfer tube of each battery component in sequence, and flows out from the main outlet.

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