A battery pack

Abstract

The utility model provides a kind of battery pack, overcome the problem of excessive local heat of monomer battery pole in existing battery pack, and cause heat runaway. The battery pack includes shell assembly, at least one electrically conductive heat exchange device and battery pack string;The inner chamber of shell assembly is divided into first area and second area isolated from each other in z direction;First area is used to place at least one battery pack string, and the size of first area along x direction is compatible with the size of battery pack string along x direction;Second area needs to ensure that electrically conductive heat exchange device is located in second area as a whole;Electrically conductive heat exchange device corresponds to battery pack string one by one, and electrically conductive heat exchange device is connected with the part of each monomer battery polarity terminal located in first area;Second area is filled with insulating sealant layer, and at least a part of electrically conductive heat exchange device and each monomer battery polarity terminal is wrapped in insulating sealant layer.

Description

Technical Field

[0001] This utility model belongs to the field of batteries, specifically relating to a battery pack. Background Technology

[0002] Currently, most common battery packs are composed of multiple battery modules connected together electrically. Temperature control of battery packs has always been a hot topic in this field, and most existing battery packs use air cooling or liquid cooling to control the overall temperature. However, since the terminals of individual cells are the areas where heat is most concentrated, excessive local heat at the terminals can potentially cause thermal runaway in individual cells within the battery pack. Utility Model Content

[0003] This utility model provides a battery pack that mainly solves the safety hazards of existing battery packs.

[0004] To solve the above problems, the technical solution provided by this utility model is as follows:

[0005] A battery pack, characterized in that it includes a shell assembly, at least one conductive heat exchange device, and a battery string; each battery string includes n individual cells arranged along the x-direction, where n≥2;

[0006] The shell assembly includes a cylinder, a cover plate, and a partition plate;

[0007] The top of the cylinder is open, and a cover plate is fixedly installed at the open end of the top of the cylinder;

[0008] The inner cavity of the housing assembly is divided into a first region and a second region in the z direction by a partition; the first region is used to place at least one battery string, and the size of the first region in the x direction is adapted to the size of the battery string in the x direction.

[0009] The dimension of the second region along the x-direction is larger than that of the first region along the x-direction, ensuring that the entire conductive heat exchange device is located within the second region;

[0010] The separator contacts the upper surface of the top cover of each individual battery cell; the separator is provided with clearance holes, and the polarity terminals of each individual battery cell in the battery string extend out of the clearance holes and into the first area, and the separator area corresponding to the clearance holes is fixedly sealed with the top cover of the individual battery cell.

[0011] The conductive heat exchange device corresponds one-to-one with the battery string. The conductive heat exchange device is connected to the part of the polarity terminal of each individual battery located in the first area, thereby realizing heat exchange of each individual battery polarity terminal and electrical connection of each individual battery in the battery string.

[0012] The second area is filled with an insulating sealant layer, and the conductive heat exchange device and at least a portion of the polarity terminals of each individual battery cell are wrapped in the insulating sealant layer.

[0013] This invention utilizes a conductive heat exchange device to directly contact the polar terminals (positive / negative electrodes) of a single battery cell for heat dissipation, achieving preferential cooling of the battery tab / terminal area. This area is prone to localized high temperatures due to the current collection effect; direct cooling can rapidly reduce the temperature and effectively prevent hot spots from triggering chain reactions such as SEI film decomposition and lithium dendrite growth.

[0014] Meanwhile, the inner cavity of the battery pack of this utility model is divided into a first region and a second region that are mutually sealed and isolated in the z direction by a partition. The second region is filled with insulating sealant. The insulating sealant layer covers the entire conductive heat exchange device and at least a part of the outer side of the polarity terminal of each individual battery, which avoids the short circuit problem that may be caused by condensation generated by the heat exchange device and improves the safety of the battery pack.

[0015] Furthermore, the aforementioned separator is integrally formed with a venting channel extending along the length of the battery string. The venting channel covers the venting section of each individual battery cell, and the cylinder is equipped with a venting pipe communicating with the venting channel. In the event of thermal runaway in any individual battery cell in the battery pack, the thermal runaway fumes can be orderly discharged from the battery pack through the venting channel for safe handling, improving the safety of the battery pack. Moreover, the venting channel being integrally formed on the separator makes the battery pack structure more compact and easier to process and manufacture.

[0016] Furthermore, the aforementioned partition has folded edges around its perimeter, and these folded edges are welded to the inner wall of the cylinder. Fixing the partition to the shell assembly via welding not only improves the overall strength of the shell assembly but also ensures a tight seal between the first and second regions.

[0017] Furthermore, an insulating flame-retardant cylinder is fitted over the outer casing of each individual battery cell. By fitting an open-top insulating flame-retardant cylinder over the outer casing of each individual battery cell, this invention ensures insulation between adjacent cells and between the individual battery cell and the cylinder. Simultaneously, the insulating flame-retardant cylinder can prevent the spread of thermal runaway between adjacent individual batteries in the event of thermal runaway.

[0018] Furthermore, the battery pack also includes a BMS; the BMS is located outside the cylinder and is embedded in a recessed portion on the outer side of the first region in the x direction relative to the outer side of the second region.

[0019] Furthermore, the conductive heat exchange device includes two conductive heat transfer tubes; both conductive heat transfer tubes extend along the x direction and are arranged in parallel along the y direction on the top of the battery string, one of which is located on n polarity terminals on one side; the other conductive heat transfer tube is located on n polarity terminals on the other side.

[0020] Each conductive heat transfer tube has two mutually isolated sub-channels extending along the x-direction. In the x-direction, the two sub-channels are the same size as the conductive heat transfer tube; each sub-channel serves as a coolant flow channel.

[0021] Each conductive heat transfer tube includes multiple first hollow components and second hollow components; the first hollow component is a conductive component that is connected to the polarity terminal of the individual cell to realize the series connection of each individual cell in the battery string; the second hollow component is an insulating component that is connected between two adjacent first hollow components.

[0022] In this invention, the conductive heat exchange device is a conductive heat transfer tube, and the conductive heat transfer tube adopts a spliced ​​structure. It can not only exchange heat with the polarity terminal of each individual battery cell, but also be used as an electrical connector to realize the series connection of each individual battery cell in the battery string, making the structure of the entire battery pack relatively simple.

[0023] In addition, the conductive heat transfer tube adopts a dual-channel cooling structure, which increases the flow rate of the coolant and improves the cooling effect.

[0024] Furthermore, to facilitate the installation of the conductive heat transfer tube, a first through slot extending in the x-direction is opened on the polar terminal of each individual cell, and the conductive heat transfer tube is installed in the first through slot.

[0025] Furthermore, the inner wall of the first hollow component is provided with heat dissipation teeth to increase the heat exchange area and improve the uniformity of heat dissipation.

[0026] Furthermore, the sub-channels of the two conductive heat transfer tubes in the same battery string, as well as the two conductive heat transfer tubes in adjacent battery strings, are all connected in series using insulated flexible tubes.

[0027] Compared with the prior art, the beneficial effects of this utility model's technical solution are as follows:

[0028] 1. This utility model's battery module features a heat exchange channel through which an insulating heat exchange medium passes. This heat exchange channel primarily exchanges heat with the polar terminals of individual cells where heat is concentrated, thereby achieving reliable temperature control of each individual cell in the battery pack. The battery module employs a direct heat exchange method, directly contacting the insulating heat exchange medium within the heat exchange channel with the polar terminals of the individual cells. The insulating heat exchange medium acts directly on the polar terminals, resulting in a shorter heat exchange path for the insulating heat exchange medium. This improves the utilization efficiency of the insulating heat exchange medium, enhances the heat exchange efficiency of the battery pack, improves the temperature control effect of the battery pack, reduces the probability of thermal runaway in the battery pack, and improves the safety of the battery pack during use.

[0029] Meanwhile, this utility model also adds a shell assembly to the outside of the battery pack string. This shell assembly has a certain pressure bearing capacity. When a single cell experiences thermal runaway, it can collect the high-temperature and high-pressure thermal runaway flue gas and electrolyte generated by the single cell in the pressure-bearing shell, avoiding the damage to surrounding devices after the high-temperature and high-pressure thermal runaway flue gas leaks, and further improving the safety of the battery pack.

[0030] The inner cavity of the battery pack housing of this utility model is divided into a first region and a second region that are mutually sealed and isolated in the z direction by a partition. The second region is filled with insulating sealant. The insulating sealant layer covers the entire conductive heat exchange device and at least a part of the outer side of the polarity terminal of each individual battery cell, which avoids the short circuit problem that may be caused by condensation generated by the heat exchange device. In addition, it can further improve the sealing performance of the entire conductive heat exchange device and enhance the safety of the battery pack.

[0031] 2. The explosion venting channel is formed on the partition of the shell assembly of this utility model, which facilitates the timely and orderly discharge of the smoke from the thermal runaway of the individual battery, avoiding the continuous occurrence of thermal runaway. Moreover, the explosion venting channel is integrally formed on the cover plate, which is easier to process and produce than setting the explosion venting channel separately or setting the explosion venting channel on the cover plate of the shell assembly. At the same time, it can also ensure a more compact battery pack structure.

[0032] 3. In the battery pack of this utility model, the separator has folded edges around its perimeter, and the folded edges are welded to the inner wall of the cylinder. Fixing the separator to the shell assembly by welding not only improves the overall strength of the shell assembly, but also ensures the sealing between the first and second regions.

[0033] 4. In the battery pack of this utility model, an insulating flame-retardant cylinder is fitted onto the outer shell of each individual battery cell. By fitting an open-top insulating flame-retardant cylinder onto the outer shell of each individual battery cell, this utility model can ensure the insulation between adjacent cells and between the individual battery cell and the cylinder. At the same time, the insulating flame-retardant cylinder can also prevent the spread of thermal runaway between adjacent individual batteries in the event of thermal runaway.

[0034] Other advantages, objectives and features of this invention will be partly apparent from the following description, and partly understood by those skilled in the art through study and practice of this invention. Attached Figure Description

[0035] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0036] Figure 1 This is an external view of the battery pack in this embodiment;

[0037] Figure 2 A structural diagram of a battery pack with the cover plate and insulating sealant layer removed;

[0038] Figure 3A structural diagram of a battery pack with the cover plate, insulating sealant layer, and cylinder removed;

[0039] Figure 4 This is a cross-sectional view of the shell assembly;

[0040] Figure 5 This is a structural diagram of the partition;

[0041] Figure 6 This is a structural diagram of a conductive heat exchanger.

[0042] Figure 7 This is a cross-sectional view of the battery pack;

[0043] Figure 8 This diagram shows the fit between a single cell, the electrode extension, and the conductive heat transfer tube.

[0044] Figure 9 This is a diagram of the external shape of an insulating flame-retardant cylinder.

[0045] Figure label:

[0046] 1-Battery string, 11-Single cell, 12-Terminal post, 13-Terminal post extension, 132-Electrical connection post, 131-Terminal post extension body, 133-First through groove, 134-Recessed structure, 2-Conductive heat exchange device, 21-Conductive heat transfer tube, 211-First hollow component, 212-Second hollow component, 22-Sub-channel, 23-Insulating hose, 3-Shell assembly, 31-Cylinder, 32-Cover plate, 33-Separator, 331-Avoidance hole, 332-Explosion venting channel, 34-First area, 35-Second area, 4-Insulating sealant layer, 5-Explosion venting pipe, 6-Insulating flame retardant cylinder, 7-BMS. Detailed Implementation

[0047] 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.

[0048] 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.

[0049] 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," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0050] This invention provides a battery pack. To reduce the probability of thermal runaway in individual cells and facilitate electrical connection between cells, a conductive heat exchange device is provided. This device primarily exchanges heat with the polar terminals of each cell where heat is concentrated. The heat exchange is performed directly, meaning the polar terminals are in direct contact with the conductive heat exchange device. Compared to the traditional method of using liquid cooling plates on the cell casings, this invention provides a shorter heat exchange path for the electrode assembly. The conductive heat exchange device directly acts on the polar terminals of each cell, improving the utilization efficiency of the insulating heat exchange medium and enhancing the overall heat exchange efficiency of the battery pack.

[0051] Secondly, the shell assembly of this utility model is divided into a first area for placing the battery string and a second area that is sealed and isolated from the first area and where the conductive heat exchange device is placed. At the same time, the second area is covered with an insulating sealant layer to cover at least a portion of the outside of the conductive heat exchange device and the polarity terminals of each individual battery, which avoids the short circuit problem that may be caused by condensation generated by the conductive heat exchange device. Furthermore, it can further improve the sealing performance of the entire conductive heat exchange device and enhance the safety of the battery pack.

[0052] Third, in this utility model, the conductive heat exchange device not only serves as a heat dissipation component, but also as an electrical conductor to realize the electrical connection of multiple individual batteries, eliminating the need for additional dedicated conductive connectors and simplifying the overall structural design of the battery pack. In addition, since the conductive heat exchange device simultaneously undertakes heat dissipation and electrical conduction functions, it reduces the number of components in the battery pack, thereby reducing assembly difficulty and cost.

[0053] It should be noted that:

[0054] 1. The polar terminal described in this utility model can be a single battery terminal post, or it can be an integral structure of a single battery terminal post and a terminal post extension member connected thereto.

[0055] 2. The conductive heat exchange device can be a pipe fitting that allows coolant to flow and is clamped on the polarity terminal of a single cell for heat exchange, or it can be a box-shaped structure that allows coolant to flow, with the polarity terminal of the single cell directly immersed in the box-shaped structure for heat exchange.

[0056] 3. For ease of description, the arrangement direction of the individual battery cells 11 is defined as the x-direction, the height direction of the individual battery cells 11 is defined as the z-direction, and the direction perpendicular to both the x-direction and the z-direction is defined as the y-direction.

[0057] The following example provides a more detailed description of the battery pack of this utility model:

[0058] like Figures 1 to 3 As shown, this embodiment provides a battery pack, which includes a shell assembly 3, a conductive heat exchange device 2, and a battery string 1; the battery string 1 consists of m units, arranged along the y-direction within the shell assembly, where m ≥ 1; in this embodiment, the number of battery strings is two.

[0059] Each battery string 1 includes n individual cells 11 arranged along the x-direction. As shown in the figure, the battery string 1 in this embodiment includes 13 individual cells 11. The individual cells 11 in this embodiment are prismatic cells, and the internal cavity of each individual cell 11 includes an electrolyte region and a gas region. In other embodiments, the number of individual cells 11 can be adjusted according to actual needs, and the shape of the individual cells 11 can also be adjusted according to actual needs.

[0060] like Figure 4 As shown, the shell assembly 3 includes a cylindrical body 31, a cover plate 32, and a partition plate 33; the top of the cylindrical body 31 is open, and the cover plate 32 is fixedly installed at the open end of the top of the cylindrical body 31; the cover plate 32 is fixedly sealed to the open end of the cylindrical body 31 by welding.

[0061] In this embodiment, the cover plate 32 is provided with flanges around its perimeter. The cover plate 32 is fastened to the open end of the cylinder 31, and the flanges are fixed to the open end of the cylinder 31 by laser welding. In other embodiments, the cover plate 32 is not provided with flanges. It is actually a flat plate with dimensions matching the open end of the cylinder 31, and is fixed to the open end of the cylinder by laser lap welding around its perimeter.

[0062] The inner cavity of the shell assembly 3 is divided into a first region 34 and a second region 35 in the z-direction by a partition 33. The first region 34 is used to place two battery strings 1, and the size of the first region 34 in the x-direction is adapted to the size of the battery strings 1 in the x-direction, and the size of the first region in the y-direction is adapted to the size of the two battery strings 1 in the y-direction (the so-called adaptation means that the size of the first region in the x and y directions can position the two battery strings). The size of the second region 35 in the x-direction is larger than the size of the first region 34 in the x-direction, ensuring that the entire conductive heat exchange device 2 is located in the second region 35.

[0063] like Figure 5As shown, the separator 33 is in contact with the top surface of the top cover of each individual battery cell 11; the separator 33 is provided with a clearance hole 331, and the polar terminal of each individual battery cell in the battery string 1 extends out of the clearance hole 331 and extends into the first area 34. The area of ​​the separator 33 corresponding to the clearance hole 331 is fixedly sealed with the top cover of the individual battery cell 11.

[0064] In this embodiment, the separator 33 is made of metal. The area of ​​the separator 33 corresponding to the clearance hole 331 can be sealed to the top cover of the single battery 11 by laser welding. The separator 33 has folded edges around its perimeter, and these folded edges are welded to the inner walls of the cylindrical body. Welding not only improves the overall strength of the shell assembly but also ensures the seal between the first region 34 and the second region 35. In some embodiments, the separator 33 is made of flame-retardant plastic. The area of ​​the separator 33 corresponding to the clearance hole 331 can be sealed to the top cover of the single battery 11 by adhesive bonding. Similarly, the separator 33 has folded edges around its perimeter, and these folded edges are fixed to the inner walls of the cylindrical body by adhesive bonding, ensuring the seal between the first region and the second region.

[0065] To ensure the strength and pressure resistance of the shell assembly 3, the cylinder 31, cover plate 32 and partition plate 33 are all made of metal materials, such as aluminum or steel. In this embodiment, the cylinder, cover plate and partition plate are all made of aluminum for easy welding.

[0066] The conductive heat exchange device 2 is connected to the portion of the polarity terminal of each individual cell 11 located in the first region 34, thereby realizing heat exchange of the polarity terminal of each individual cell 11 and electrical connection of each individual cell in the battery string 1.

[0067] like Figure 3 As shown in Figure 6, in this embodiment, the specific structure of the heat transfer device 2 is as follows: it includes two conductive heat transfer tubes 21; both conductive heat transfer tubes 21 extend along the x direction and are arranged in parallel along the y direction on the top of the battery string 1, wherein one conductive heat transfer tube 21 is located on the n polar terminals on one side; the other conductive heat transfer tube 21 is located on the n polar terminals on the other side.

[0068] Each conductive heat transfer tube 21 has two mutually isolated sub-channels 22 extending along the x-direction. In the x-direction, the two sub-channels 22 have the same size as the conductive heat transfer tube 21; each sub-channel 22 serves as a coolant flow channel.

[0069] Each conductive heat transfer tube 21 includes multiple segments of first hollow components 211 and second hollow components 212. The first hollow component 211 is a conductive component, connected to the polarity terminal of the individual battery cell 11, realizing the series connection of each individual battery cell 11 in the battery string 1. The second hollow component 212 is an insulating component, connected between two adjacent segments of the first hollow component 211. In this embodiment, the four conductive heat transfer tubes 21 of the two battery strings are connected in series through insulating flexible tubes 23; in some other embodiments, the four conductive heat transfer tubes 21 of the two battery strings can be connected in parallel through two busbars.

[0070] In some other embodiments, the conductive heat transfer tube 21 may also be provided with only one sub-channel;

[0071] In this embodiment, the heat exchange medium inside the conductive heat transfer tube 21 can be an insulating heat transfer medium such as insulating oil or fluorinated liquid; in some other embodiments, if water is used as the heat exchange medium, the inner wall of the heat transfer tube needs to be insulated.

[0072] In this embodiment, in order to further improve the heat dissipation performance of the conductive heat exchange tube 21, heat dissipation teeth can also be provided in the first hollow component 211. Multiple heat dissipation teeth are arranged circumferentially along the first hollow component 211, and each heat dissipation tooth extends circumferentially along the first hollow component 211.

[0073] like Figure 7 As shown, the second region 35 is filled with an insulating sealant layer 4, and the conductive heat exchange device 2 and at least a portion of the polar terminals of each individual battery 11 are wrapped in the insulating sealant layer 4.

[0074] like Figure 8 As shown, in this embodiment, the polarity terminal of the single cell 11 is a terminal extension 13 connected to the original terminal 12 of the single cell. The terminal extension 13 includes an electrical connection post 132 and a terminal extension body 131. The electrical connection post 132 is located at the bottom of the terminal extension body 131 and protrudes from the terminal extension body 131. A first through groove 133 for installing the conductive heat transfer tube 2 is provided on the terminal extension body 131. Figure 5 To facilitate visualization of the first through-slot 133, no conductive heat transfer tube 21 is installed in one side of the first through-slot 133. The first through-slot 133 extends along the x-direction, meaning its length is parallel to the x-axis. The inner shape of the first through-slot 133 is adapted to the cross-sectional shape of the conductive heat transfer tube 21, ensuring that the tube is tightly clamped within it. This ensures installation stability while also guaranteeing heat transfer between the tube and the electrode extension 13. Figure 5As can be seen from the diagram, this embodiment uses a rectangular first through groove 133, and the conductive heat transfer tube 21 adapted to it is a square tube. In order to facilitate the connection between the electrode extension 13 and the electrode 12 of the single cell 11, this embodiment has a recessed structure 134 at the bottom of the first through groove 133 that is recessed into the electrical connection post 132; the bottom of the recessed structure 134 is connected to the electrode 12 of the single cell 11.

[0075] Specifically, the conductive heat transfer tube 21 can be fixed to the battery string 1 through the following process: First, align the electrical connection post 132 of each terminal extension 13 with the terminal post 12 of the individual battery 11 to ensure contact; then, connect the bottom of the recessed structure 134 to the terminal post 12 by through soldering. After all the terminal extensions 13 are fixed, fix one of the conductive heat transfer tubes 21 in the first through groove 133 of each terminal extension body 131 located on one side, and fix the other conductive heat transfer tube 21 in the first through groove 133 of each terminal extension body 131 located on the other side.

[0076] In other embodiments, when the height of the electrode post 12 of the single cell 11 meets the requirements, the first through groove 133 can be directly opened on the electrode post 12 to fix the conductive heat transfer tube 21.

[0077] like Figure 5 and Figure 8 As shown, in this embodiment, a venting channel 332 extending along the length of the battery string is integrally formed on the separator 33 (since there are two battery strings in this embodiment, two venting channels are provided on the separator). The venting channel 332 covers the venting part of each individual battery cell 11, and a venting pipe 5 communicating with the venting channel is provided on the cylinder 31. When any individual battery cell in the battery pack experiences thermal runaway, the thermal runaway fumes can be orderly discharged from the battery pack through the venting channel 332 for safe handling, improving the safety of the battery pack. Furthermore, the venting channel being integrally formed on the separator makes the battery pack structure more compact and easier to process and manufacture.

[0078] like Figure 9 As shown in this embodiment, an insulating flame-retardant cylinder 6 is also fitted onto the outer casing of each individual battery cell 11. By fitting an insulating flame-retardant cylinder 6 with an open top onto the outer casing of each individual battery cell 11, the insulation between adjacent cells and between the individual battery cell and the cylinder can be ensured. At the same time, the insulating flame-retardant cylinder 6 can also prevent the spread of thermal runaway between adjacent individual batteries in the event of thermal runaway.

[0079] like Figure 1 As shown, in this embodiment, the battery pack also includes a BMS7; the BMS7 is located outside the cylinder 31 and is embedded in the recessed portion of the first region 34 in the x direction relative to the outer side of the second region 35, thereby making the entire battery pack look neat and the structure more compact.

Claims

1. A battery pack, characterized by, It includes a shell assembly, at least one conductive heat exchange device, and at least one battery string; each battery string includes n individual cells arranged along the x-direction, where n≥2; The shell assembly includes a cylinder, a cover plate, and a partition plate; The top of the cylinder is open, and a cover plate is fixedly installed at the open end of the top of the cylinder; The inner cavity of the housing assembly is divided into a first region and a second region in the z direction by a partition; the first region is used to place at least one battery string, and the size of the first region in the x direction is adapted to the size of the battery string in the x direction. The dimension of the second region along the x-direction is larger than that of the first region along the x-direction, ensuring that the entire conductive heat exchange device is located within the second region; The separator contacts the upper surface of the top cover of each individual battery cell; the separator is provided with clearance holes, and the polarity terminals of each individual battery cell in the battery string extend out of the clearance holes and into the first area, and the separator area corresponding to the clearance holes is fixedly sealed with the top cover of the individual battery cell. The conductive heat exchange device corresponds one-to-one with the battery string. The conductive heat exchange device is connected to the part of the polarity terminal of each individual battery located in the first area, thereby realizing heat exchange of each individual battery polarity terminal and electrical connection of each individual battery in the battery string. The second area is filled with an insulating sealant layer, and the conductive heat exchange device and at least a portion of the polarity terminals of each individual battery cell are wrapped in the insulating sealant layer.

2. The battery pack of claim 1, wherein, The separator has an integrally formed explosion venting channel extending along the length of the battery string, the explosion venting channel covers the explosion venting part of each individual battery, and the cylinder is provided with an explosion venting pipe communicating with the explosion venting channel.

3. The battery pack of claim 2, wherein, The partition plate has folded edges around its perimeter, and these folded edges are welded to the inner walls of the cylinder.

4. The battery pack of claim 1, wherein, An insulating flame-retardant sleeve is also fitted onto the outer casing of the individual battery.

5. The battery pack of claim 1, wherein, It also includes a BMS; the BMS is located outside the cylinder and is embedded in the recessed portion of the first region in the x direction relative to the outer side of the second region.

6. The battery pack of any one of claims 1 to 5, wherein, The conductive heat exchange device includes two conductive heat transfer tubes; both conductive heat transfer tubes extend along the x direction and are arranged in parallel along the y direction on the top of the battery module, with one conductive heat transfer tube located on n polarity terminals on one side; the other conductive heat transfer tube is located on n polarity terminals on the other side. Each conductive heat transfer tube has two mutually isolated sub-channels extending along the x-direction. In the x-direction, the two sub-channels are the same size as the conductive heat transfer tube; each sub-channel serves as a coolant flow channel. Each conductive heat transfer tube includes multiple first hollow components and second hollow components; the first hollow component is a conductive component, which is connected to the polarity terminal of the individual cell to realize the series connection of each individual cell in the battery string. The second hollow component is an insulating component, connected between two adjacent sections of the first hollow component.

7. The battery pack of claim 6, wherein, Each individual cell has a first through slot extending in the x-direction on its polar terminal, and a conductive heat transfer tube is installed in the first through slot.

8. The battery pack according to claim 7, characterized in that, The inner wall of the first hollow component is provided with heat dissipation teeth.

9. The battery pack according to claim 8, characterized in that, The sub-channels of the two conductive heat transfer tubes in the same battery string, as well as the two conductive heat transfer tubes of adjacent battery strings, are all connected in series using insulated flexible tubes.

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