A battery pack

Abstract

The application discloses a battery pack, and relates to the technical field of batteries, which comprises a first battery group and a second battery group, which are arranged in layers along a first direction, and each single battery of the first battery group is electrically connected through a first conductive row assembly, and each single battery of the second battery group is electrically connected through a second conductive row assembly; a middle cold plate device is arranged between the first battery group and the second battery group, the first conductive row assembly and the second conductive row assembly are respectively heat-conducting and attached to two side surfaces of the middle cold plate device, and the two side surfaces are surfaces of the middle cold plate device arranged along the first direction. The middle cold plate device is arranged between the first battery group and the second battery group, and is directly and closely attached to the conductive row assemblies of the two battery groups, the heat dissipation path of the conductive row assemblies is extremely short, and the heat dissipation efficiency is relatively high. The middle cold plate device can quickly take away the heat generated by the conductive row assemblies, effectively prevents the temperature of the conductive row assemblies from being too high, and reduces the risk of thermal runaway.

Description

Technical Field

[0001] This application relates to the field of battery technology, and more specifically, to a battery pack. Background Technology

[0002] To improve space utilization, current battery packs typically employ a two-layer battery pack arrangement. When a battery pack has multiple battery packs, its thermal management solution involves arranging multiple side cooling plates for each battery pack layer. These side cooling plates are generally placed between adjacent rows of battery packs to exchange heat with the sides of individual cells, thereby achieving temperature control.

[0003] As the discharge rate of the battery pack increases, the conductive side (the side with the conductive busbar) of the battery pack generates more heat. The side cooling plate has an insignificant cooling effect on the conductive side of the battery pack, resulting in a high temperature of the battery pack and a risk of thermal runaway.

[0004] Therefore, how to reduce the temperature on the conductive side of the battery pack and reduce the risk of thermal runaway is a problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0005] In view of this, the purpose of this application is to provide a battery pack to reduce the temperature on the conductive side of the battery pack and reduce the risk of thermal runaway.

[0006] To achieve the above objectives, this application provides the following technical solution:

[0007] The first aspect of this application provides a battery pack, comprising:

[0008] The first battery pack and the second battery pack are stacked along a first direction, and each individual cell of the first battery pack is electrically connected through a first conductive busbar assembly, and each individual cell of the second battery pack is electrically connected through a second conductive busbar assembly.

[0009] A central cold plate device is disposed between the first battery pack and the second battery pack. The first conductive busbar assembly and the second conductive busbar assembly are thermally bonded to both sides of the central cold plate device. The two sides are the surfaces of the central cold plate device arranged along the first direction. A first thermally conductive potting compound layer is disposed between the first battery pack and the central cold plate device, and a second thermally conductive potting compound layer is disposed between the second battery pack and the central cold plate device.

[0010] The battery pack provided in this application includes two battery packs (a first battery pack and a second battery pack) stacked along a first direction. A central cold plate device is arranged between the two battery packs, and the conductive busbars of the two battery packs are thermally bonded to the two sides of the central cold plate device. The heat exchange area is increased by using a first thermally conductive potting compound layer and a second thermally conductive potting compound layer, so that the central cold plate device can cool and dissipate heat for the conductive busbars of the two battery packs.

[0011] During charging and discharging, the current flowing through the busbar assemblies (first and second busbar assemblies) generates significant heat. This is especially true during high-rate fast charging or high-power discharging, where the busbar assemblies become a major heat source for the battery pack. By directly and tightly attaching the central cooling plate to the busbar assemblies, the heat dissipation path of the busbar assemblies is extremely short, resulting in high heat dissipation efficiency. The central cooling plate can quickly remove the heat generated by the busbar assemblies, effectively preventing overheating and reducing the risk of thermal runaway.

[0012] The central cooling plate device, sandwiched between the first and second battery packs, can simultaneously cool both layers of conductive busbar assemblies. This symmetrical design ensures a more uniform thermal environment for both battery pack layers, helping to reduce temperature differences between them. Battery pack performance, lifespan, and safety are extremely sensitive to temperature uniformity. This application implements thermal management from between the first and second battery packs, helping to maintain the overall battery pack temperature within a more uniform and ideal range, thereby slowing cell degradation and improving consistency. Furthermore, placing the central cooling plate device between the two battery pack layers cleverly utilizes the internal space of the battery pack, which is crucial for battery pack designs aiming for high energy density, achieving a high degree of integration between structure and function. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this application 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 application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a schematic diagram of the battery pack structure after the casing is removed, as disclosed in the embodiments of this application;

[0015] Figure 2 The side view of the battery pack after removing the casing is disclosed in the embodiments of this application;

[0016] Figure 3 This is a schematic diagram of the battery pack disclosed in the embodiments of this application after removing some individual cells;

[0017] Figure 4 This is a schematic diagram of the structure of the cold plate assembly disclosed in the embodiments of this application;

[0018] Figure 5 This is a top view of the central cold plate device disclosed in the embodiments of this application;

[0019] Figure 6 for Figure 5 Sectional view along AA;

[0020] Figure 7 for Figure 5 A cross-sectional view along BB;

[0021] Figure 8 This is a schematic diagram of the structure of the central cold plate device disclosed in the embodiments of this application.

[0022] The meanings of the various reference numerals in the figure are as follows:

[0023] 100 - First battery pack;

[0024] 200 - First battery pack;

[0025] 300 - Central cold plate assembly; 301 - Through hole; 302 - Medium flow channel; 303 - Isolation block;

[0026] 400-Side cold plate assembly;

[0027] 500 - First Conductor Busbar Assembly;

[0028] 600 - Second Conductor Busbar Assembly;

[0029] 700 - First thermally conductive potting compound layer;

[0030] 800 - Second thermally conductive potting compound layer. Detailed Implementation

[0031] This application discloses a battery pack to reduce the temperature on the conductive side of the battery pack and reduce the risk of thermal runaway.

[0032] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0033] like Figures 1-3 As shown in the figure, this application discloses a battery pack, which includes a first battery pack 100, a second battery pack 200 and a central cold plate device 300.

[0034] Those skilled in the art will understand that a battery pack, as a rechargeable battery, is the power source for new energy vehicles. It generally includes a battery pack (such as the first battery pack 100 and the second battery pack 200 disclosed in this embodiment) composed of multiple battery cells connected in series and / or in parallel, a BMS (Battery Management System), a thermal management system (such as the central cold plate device 300 disclosed in this embodiment), an electrical connection system (high voltage / low voltage connectors, wiring harnesses, etc.), structural components (shell, brackets, etc.), and protective components, etc. The above components are placed in a box and sealed with a cover plate to form a complete functional unit that can directly output electrical energy.

[0035] Both the first battery pack 100 and the second battery pack 200 can be formed by connecting multiple individual cells of similar capacity and internal resistance in series or parallel. Individual cells can store chemical energy and controllably convert it into electrical energy. In recyclable individual cells, the active materials can be reactivated by charging after discharge, allowing for continued use. Individual cells generally include a casing and a cell housed within the casing. The first battery pack 100 and the second battery pack 200 are stacked along a first direction. When the battery pack is placed on a horizontal surface, the first direction can be vertical, meaning the first battery pack 100 and the second battery pack 200 are arranged vertically, one above the other.

[0036] The individual cells of the first battery pack 100 are electrically connected through the first busbar assembly 500, and the individual cells of the second battery pack 200 are electrically connected through the second busbar assembly 600. The individual cells of the first battery pack 100 and the second battery pack 200 are assembled into a battery pack by connecting their busbar assemblies (first busbar assembly 500 and second busbar assembly 600) in series and parallel. The first battery pack 100 and the second battery pack 200 are then connected in series and parallel through a busbar to form a battery pack.

[0037] For a battery pack, the most basic functional requirement is the ability to input and output electrical energy. Therefore, the safety and reliability of the first busbar assembly 500 and the second busbar assembly 600 within the battery pack are particularly important. The first busbar assembly 500 and the second busbar assembly 600 are connected by welding between the terminal assemblies of individual cells (the terminal assemblies are crucial components connecting individual cells to external circuits, transferring electrical energy generated by the cell to the external circuit and simultaneously introducing electrical energy from the external circuit into the cell for charging, acting as a bridge for current conduction). Terminal assemblies generally include positive and negative terminal assemblies. When two individual cells are connected in series, the busbar assembly needs to electrically connect to the positive terminal assembly of one individual cell and the negative terminal assembly of the other individual cell; when two individual cells are connected in parallel, the busbar assembly needs to electrically connect to the terminal assemblies of the same polarity of both individual cells.

[0038] The central cold plate device 300 is disposed between the first battery pack 100 and the second battery pack 200. The first conductive bus assemblies 500 and the second conductive bus assemblies 600 are thermally bonded to the two side surfaces of the central cold plate device 300, and the two side surfaces are the surfaces of the central cold plate device 300 arranged along the first direction.

[0039] Taking the first battery pack 100 located above the central cold plate device 300 and the second battery pack 200 located below the central cold plate device 300 as an example, the first battery pack 100 is inverted and the second battery pack 200 is upright. In other words, the terminal assembly of the first battery pack 100 is arranged downwards and the terminal assembly of the second battery pack 200 is arranged upwards. That is, the two battery packs (the first battery pack 100 and the second battery pack 200) adopt a terminal-to-terminal arrangement and use the central cold plate device 300 between them for heat exchange.

[0040] The central cooling plate device 300 is used for heat exchange with the first battery pack 100 and the second battery pack 200 to regulate the temperature of the first battery pack 100 and the second battery pack 200. The central cooling plate device 300 has heat exchange channels; specifically, the shape of the liquid cooling channels can be U-shaped, U-shaped, or S-shaped, etc. The central cooling plate device 300 can be made of a material with a certain degree of hardness and strength. This makes the central cooling plate device 300 less prone to deformation when a single battery cell is subjected to compression or impact, allowing the single battery cell to have higher structural strength and improved safety performance. The material of the central cooling plate device 300 can be various, including but not limited to: copper, iron, aluminum, stainless steel, aluminum alloy, etc. The material of the central cooling plate device 300 can also be nylon, plastic, etc.

[0041] Even though the first busbar assembly 500 and the central cold plate device 300 are surface-mounted, they are still point-to-point contacts at the microscopic level, with a large number of air gaps. Air is a poor conductor of heat, which creates huge contact thermal resistance, severely hindering the transfer of heat from the first busbar assembly 500 to the central cold plate device 300.

[0042] Based on this, in this embodiment, a first thermally conductive potting compound layer 700 is provided between the first battery pack 100 and the central cold plate device 300, and a second thermally conductive potting compound layer 800 is provided between the second battery pack 200 and the central cold plate device 300.

[0043] In summary, the battery pack disclosed in this application includes two battery packs (first battery pack 100 and second battery pack 200) stacked along a first direction. A central cold plate device 300 is disposed between the two battery packs, and the conductive busbar assemblies of the two battery packs are thermally bonded to both sides of the central cold plate device 300, so that the central cold plate device 300 can cool and dissipate heat for the conductive busbar assemblies (first conductive busbar assembly 500 and second conductive busbar assembly 600) of the two battery packs. At the same time, the first thermally conductive potting compound layer 700 and the second thermally conductive potting compound layer 800 are used to increase the heat exchange area between the central cold plate device 300 and the two battery packs, thereby improving the heat exchange efficiency.

[0044] During charging and discharging, the current flowing through the busbar assemblies (first busbar assembly 500 and second busbar assembly 600) generates significant heat. Especially during high-rate fast charging or high-power discharging, the busbar assemblies become a major heat source for the battery pack. In this embodiment, the central cooling plate device 300 is directly and tightly attached to the busbar assemblies, resulting in an extremely short heat dissipation path and high heat dissipation efficiency. The central cooling plate device 300 can quickly remove the heat generated by the busbar assemblies, effectively preventing overheating and reducing the risk of thermal runaway.

[0045] The central cooling plate device 300, sandwiched between the first battery pack 100 and the second battery pack 200, can simultaneously cool both layers of conductive busbar assemblies. This symmetrical design ensures a more uniform thermal environment for the two battery pack layers, helping to reduce temperature differences between them. Battery pack performance, lifespan, and safety are extremely sensitive to temperature uniformity. This application implements thermal management from between the first battery pack 100 and the second battery pack 200, helping to maintain the temperature of the entire battery pack within a more uniform and ideal range, thereby delaying cell degradation and improving consistency. Furthermore, placing the central cooling plate device 300 between the two battery pack layers cleverly utilizes the internal space of the battery pack, which is crucial for battery pack designs pursuing high energy density, achieving a high degree of integration between structure and function.

[0046] In a specific embodiment of this application, the first conductive bus assembly 500 can be embedded in the first thermally conductive potting compound layer 700. The first thermally conductive potting compound layer 700 can completely fill the tiny air gap between the first conductive bus assembly 500 and the central cold plate device 300, minimizing the contact thermal resistance and allowing heat to be conducted from the first conductive bus assembly 500 to the central cold plate device 300 with extremely high efficiency, resulting in an order-of-magnitude improvement in heat dissipation efficiency.

[0047] The first thermally conductive potting compound layer 700 not only fills the contact surface but also completely encapsulates the first busbar assembly 500. Heat can be conducted from all directions of the first busbar assembly 500 to the first thermally conductive potting compound layer 700, and then transferred through the first thermally conductive potting compound layer 700 to the central cold plate device 300. This passively increases the effective heat dissipation area of ​​the first busbar assembly 500, resulting in a more uniform and thorough cooling effect.

[0048] The first thermally conductive potting compound 700 is typically an excellent insulating material (i.e., the first thermally conductive potting compound 700 is an insulating foam layer). After curing, it completely encapsulates and fixes the first conductive bus assembly 500, forming a robust insulating protective layer. This fundamentally eliminates short circuit problems caused by liquid intrusion, condensation, or metallic foreign objects, greatly improving electrical safety. The first thermally conductive potting compound 700 firmly adheres the first conductive bus assembly 500 to the central cold plate device 300, forming an integral structure that greatly enhances mechanical strength and prevents the first conductive bus assembly 500 from loosening or fatigue fracture due to vibration.

[0049] Similarly, the second conductive bus assembly 600 is embedded within the second thermally conductive potting compound layer 800. The second thermally conductive potting compound layer 800 can completely fill the tiny air gap between the second conductive bus assembly 600 and the central cold plate device 300, minimizing contact thermal resistance and allowing heat to be conducted from the second conductive bus assembly 600 to the central cold plate device 300 with extremely high efficiency, resulting in an order-of-magnitude improvement in heat dissipation efficiency.

[0050] The second thermally conductive potting compound layer 800 not only fills the contact surface but also completely encapsulates the second busbar assembly 600. Heat can be conducted from all directions of the second busbar assembly 600 to the second thermally conductive potting compound layer 800, and then transferred through the second thermally conductive potting compound layer 800 to the central cold plate device 300. This passively increases the effective heat dissipation area of ​​the second busbar assembly 600, resulting in a more uniform and thorough cooling effect.

[0051] The second thermally conductive potting compound layer 800 is typically an excellent insulating material (i.e., the second thermally conductive potting compound layer 800 is an insulating foam layer). After curing, it completely encapsulates and fixes the second busbar assembly 600, forming a robust insulating protective layer. This fundamentally eliminates short circuit problems caused by liquid intrusion, condensation, or metallic foreign objects, greatly improving electrical safety. The second thermally conductive potting compound layer 800 firmly adheres the second busbar assembly 600 to the central cold plate device 300, forming an integral structure that greatly enhances mechanical strength and prevents the second busbar assembly 600 from loosening or fatigue-induced fracture due to vibration.

[0052] Furthermore, the thicknesses of the first thermally conductive potting compound layer 700 and the second thermally conductive potting compound layer 800 are equal. It should be noted that the thicknesses of the first thermally conductive potting compound layer 700 and the second thermally conductive potting compound layer 800 can also be designed to be unequal. Those skilled in the art can select the thicknesses of the first thermally conductive potting compound layer 700 and the second thermally conductive potting compound layer 800 based on design requirements. This embodiment does not limit the relationship between the thicknesses of the first thermally conductive potting compound layer 700 and the second thermally conductive potting compound layer 800.

[0053] Those skilled in the art will understand that when a single battery cell is in operation, the cell itself expands and contracts, resulting in minute deformations. If the first thermally conductive potting compound layer 700 is too thin and brittle, it may crack due to frequent stress changes.

[0054] like Figure 2 As shown, in a specific embodiment of this application, the first thermally conductive potting compound layer 700 fills the gap between the side of the first battery pack 100 facing the central cold plate device 300 and the central cold plate device 300, and the first thermally conductive potting compound layer 700 covers a portion of the structure of the first battery pack 100 along a first direction. Specifically, along the first direction, the thickness of the first thermally conductive potting compound layer 700 covering the first battery pack 100 is L1mm, and the value of L1mm can be in the range of 2mm to 4mm. That is, when the single cell of the first battery pack 100 is a cylindrical cell, the thickness of the first thermally conductive potting compound layer 700 covering the single cell in the axial direction can be 2mm to 4mm. For example, the thickness of the first thermally conductive potting compound layer 700 covering the single cell in the axial direction can be 2mm, 2.2mm, 2.4mm, 2.6mm, 2.8mm, 3mm, 3.2mm, 3.4mm, 3.6mm, 3.8mm, 4mm, etc.

[0055] The first thermally conductive potting compound layer 700 has a certain thickness, which gives it better flexibility and elasticity. It can absorb and buffer the thermal stress between the single cell and the first conductive bus assembly 500, avoid cracking caused by rigid connection, and ensure long-term reliability.

[0056] The thicker first thermally conductive potting compound layer 700 is equivalent to a larger heat capacity pool and a lateral heat conduction path. It can absorb instantaneous heat generation peaks, prevent a sharp temperature rise, and conduct heat more evenly from the high-temperature area to the entire surface of the central cold plate assembly 300 through the first thermally conductive potting compound layer 700 itself, thereby improving the temperature uniformity of the entire contact surface.

[0057] When the first thermally conductive potting compound layer 700 wraps around the end face and part of the side of the single cell, it is no longer a simple adhesive bond, but rather firmly bonds the first battery pack 100 to the central cold plate device 300 into a robust integral structure, greatly enhancing the battery pack's resistance to vibration and impact.

[0058] The first thermally conductive potting compound layer 700 covers a portion of the side of the single cell, which can effectively suppress the radial deformation of the single cell during charge and discharge cycles and vehicle vibration, and has a positive effect on extending the life of the single cell.

[0059] The first thermally conductive potting compound layer 700 covers the side of the individual battery cell, meaning that it provides a complete, seamless, three-dimensional sealed environment for the most critical electrical connection parts, such as the first conductive bus assembly 500 and the battery terminals. This completely prevents the intrusion of moisture, humidity, and corrosive gases, preventing terminal corrosion and short circuits, and greatly improving the battery pack's adaptability to harsh environments.

[0060] Similarly, the second thermally conductive potting compound layer 800 fills the gap between the side of the second battery pack 200 facing the central cold plate device 300 and the central cold plate device 300, and the second thermally conductive potting compound layer 800 covers a portion of the structure of the second battery pack 200 along the first direction. Specifically, along the first direction, the thickness of the second thermally conductive potting compound layer 800 covering the second battery pack 200 is L2mm, and the value of L2mm ranges from 2mm to 4mm. That is, when the individual cells of the second battery pack 200 are cylindrical cells, the thickness of the second thermally conductive potting compound layer 800 covering the individual cell in the axial direction can be 2mm to 4mm. For example, the thickness of the second thermally conductive potting compound layer 800 covering the individual cell in the axial direction can be 2mm, 2.2mm, 2.4mm, 2.6mm, 2.8mm, 3mm, 3.2mm, 3.4mm, 3.6mm, 3.8mm, 4mm, etc.

[0061] The second thermally conductive potting compound layer 800 has a certain thickness, which gives it better flexibility and elasticity. It can absorb and buffer the thermal stress between the single cell and the second conductive bus assembly 600, avoid cracking caused by rigid connection, and ensure long-term reliability.

[0062] The thicker second thermally conductive potting compound layer 800 is equivalent to a larger heat capacity pool and a lateral heat conduction path. It can absorb instantaneous heat generation peaks, prevent rapid temperature spikes, and conduct heat more evenly from high-temperature areas to the entire surface of the central cold plate assembly 300 through the second thermally conductive potting compound layer 800 itself, thereby improving the temperature uniformity of the entire contact surface.

[0063] When the second thermally conductive potting compound layer 800 wraps around the end face and part of the side of the single cell, it is no longer a simple adhesive bond, but rather firmly bonds the second battery pack 200 to the central cold plate device 300 into a robust integral structure, greatly enhancing the battery pack's resistance to vibration and impact.

[0064] The second thermally conductive potting compound layer 800 covers a portion of the side of the single cell, which can effectively suppress the radial deformation of the single cell during charge and discharge cycles and vehicle vibration, and has a positive effect on extending the life of the single cell.

[0065] The second thermally conductive potting compound layer 800 covers the side of the individual battery cell, meaning that the second thermally conductive potting compound layer 800 provides a complete, three-dimensional sealed environment without dead angles for the most critical electrical connection parts such as the second conductive bus assembly 600 and the battery terminals. This completely prevents the intrusion of moisture, humidity, and corrosive gases, preventing terminal corrosion and short circuits, and greatly improving the battery pack's adaptability to harsh environments. Furthermore, the first battery pack 100 and the second battery pack 200 include multiple rows of battery cells arranged along a second direction. Each battery cell includes multiple individual batteries arranged along a third direction, with the first, second, and third directions perpendicular to each other. The dielectric flow channels 302 and the separators both extend along the third direction, and each dielectric flow channel 302 is arranged along the second direction. Along the second direction, the central cold plate device 300 has multiple rows of through holes arranged at intervals; along the third direction, each row of through holes includes multiple through holes 301 arranged at intervals. This embodiment does not limit the number of columns of through holes 301, the number of through holes 301 in each column, or the cross-sectional area of ​​the through holes 301. Of course, there can be only one through hole 301 along the third direction, as long as the length of the through hole 301 along the third direction is long enough.

[0066] In another embodiment of this application, the through hole 301 may also be provided at the location of the medium flow channel 302. For ease of understanding, the medium flow channel 302 with the through hole 301 is defined as the first medium flow channel, and the medium flow channel without the through hole 301 is defined as the second medium flow channel.

[0067] An isolation block 303 is provided inside the first medium flow channel, and a through hole 301 is formed on the isolation block 303 to isolate it from the first medium flow channel. That is, in this embodiment, the through hole 301 is located in the first medium flow channel. In order to prevent the heat exchange medium in the first medium flow channel from leaking due to the through hole 301, an isolation block 303 is provided inside the first medium flow channel, and the through hole 301 is formed on the isolation block 303, so that the through hole 301 is isolated from the first medium flow channel, and the heat exchange medium in the first medium flow channel will not leak through the through hole 301.

[0068] Furthermore, the first battery pack 100 and the second battery pack 200 include multiple rows of battery cells arranged along a second direction. Each battery cell row includes multiple individual cells arranged along a third direction, with the first, second, and third directions perpendicular to each other. Medium flow channels 302 extend along the third direction, and each medium flow channel 302 is arranged along the second direction. Along the second direction, the central cold plate device 300 is provided with multiple rows of through holes arranged at intervals. Along the third direction, each row of through holes includes multiple through holes 301 arranged at intervals. This embodiment does not limit the number of rows of through holes 301, the number of through holes 301 in each row, or the cross-sectional area of ​​the through holes 301. Of course, along the third direction, there can be only one through hole 301, as long as the length of the through hole 301 along the third direction is sufficiently long.

[0069] Each medium flow channel 302 can be a first medium flow channel, meaning each medium flow channel 302 is provided with an isolation block 303 and a through hole 301; alternatively, at least one second medium flow channel can be provided between any two adjacent first medium flow channels, meaning not every medium flow channel 302 is provided with an isolation block 303 and a through hole 301. This embodiment does not limit the position and number of the medium flow channels 302 with isolation blocks 303 and through holes 301, as long as it ensures that the potting compound can pass through and be evenly spread on the lower side of the central cold plate device 300.

[0070] like Figure 8 As shown, along the second direction, the isolation block 303 is located in the middle of the first medium flow channel. It should be noted that the isolation block 303 may also be biased towards one end of the first medium flow channel. In this embodiment, the position of the isolation block 303 within the first medium flow channel is not limited.

[0071] In one specific embodiment of this application, the gaps between the individual cells of the first battery pack 100 are filled with a first heat-insulating potting compound layer (not shown in the figure), and the first heat-insulating potting compound layer and the first thermally conductive potting compound layer 700 are arranged along a first direction. The thermal conductivity of the first thermally conductive potting compound layer 700 is greater than that of the first heat-insulating potting compound layer. The first heat-insulating potting compound layer can block the heat propagation path between the individual cells of the first battery pack 100, greatly delaying or even preventing heat transfer to adjacent areas, thus buying crucial time for passenger escape.

[0072] The battery pack casing gets very hot in the summer sun and very cold in the winter. Applying a first thermal insulation potting compound layer to non-critical areas inside the battery pack that come into contact with the casing can reduce the interference of external ambient temperature on the internal temperature field of the battery pack. This helps the battery management system to more accurately control cell temperature, reduce energy consumption, and improve the performance consistency of the battery pack under all-weather conditions.

[0073] Similarly, the gaps between the individual cells of the second battery pack 200 are filled with a second heat-insulating potting compound layer, and the second heat-insulating potting compound layer and the second heat-conducting potting compound layer 800 are arranged along the first direction. The thermal conductivity of the second heat-conducting potting compound layer 800 is greater than that of the second heat-insulating potting compound layer. The second heat-conducting potting compound layer 800 can block the heat propagation path between the individual cells of the second battery pack 200, greatly delaying or even preventing heat transfer to adjacent areas, thus buying crucial time for passenger escape.

[0074] If a second thermally conductive potting compound layer 800 is injected into the non-critical areas inside the battery pack that are in contact with the outer casing, the interference of the external ambient temperature on the internal temperature field of the battery pack can be reduced. This helps the battery management system to control the cell temperature more accurately, reduce energy consumption, and improve the performance consistency of the battery pack under all-weather conditions.

[0075] The first and second heat-insulating potting compounds can be made of the same material, or they can be made of different materials depending on the requirements. Similarly, the first thermally conductive potting compound 700 and the second thermally conductive potting compound 800 can be made of the same material, or they can be made of different materials depending on the requirements.

[0076] Furthermore, the thermal conductivity of the first thermally conductive potting compound layer 700 is 0.4 W / (m·K) to 0.6 W / (m·K). For example, the thermal conductivity of the first thermally conductive potting compound layer 700 can be 0.4 W / (m·K), 0.45 W / (m·K), 0.47 W / (m·K), 0.5 W / (m·K), 0.53 W / (m·K), 0.45 W / (m·K), 0.47 W / (m·K), 0.6 W / (m·K), etc. This embodiment does not limit the specific value of the thermal conductivity of the first thermally conductive potting compound layer 700. Those skilled in the art can select it within the range of 0.4 W / (m·K) to 0.6 W / (m·K) based on their needs.

[0077] Similarly, the thermal conductivity of the second thermally conductive potting compound layer 800 is 0.4 W / (m·K) to 0.6 W / (m·K). For example, the thermal conductivity of the second thermally conductive potting compound layer 800 can be 0.4 W / (m·K), 0.45 W / (m·K), 0.47 W / (m·K), 0.5 W / (m·K), 0.53 W / (m·K), 0.45 W / (m·K), 0.47 W / (m·K), 0.6 W / (m·K), etc. This embodiment does not limit the specific value of the thermal conductivity of the second thermally conductive potting compound layer 800. Those skilled in the art can select it within the range of 0.4 W / (m·K) to 0.6 W / (m·K) based on their needs.

[0078] In this embodiment, the thermal conductivity of the first thermally conductive potting compound layer 700 and the second thermally conductive potting compound layer 800 can be designed to be the same or different.

[0079] The thermal conductivity of the first thermal insulation potting compound layer is 0.04 W / (m·K) to 0.08 W / (m·K). For example, the thermal conductivity of the first thermal insulation potting compound layer can be 0.04 W / (m·K), 0.045 W / (m·K), 0.047 W / (m·K), 0.05 W / (m·K), 0.053 W / (m·K), 0.045 W / (m·K), 0.047 W / (m·K), 0.06 W / (m·K), 0.063 W / (m·K), 0.065 W / (m·K), 0.067 W / (m·K), 0.07 W / (m·K), 0.073 W / (m·K), 0.075 W / (m·K), or 0.077 W / (m·K). The specific value of the thermal conductivity of the first thermal insulation potting compound layer is not limited in this embodiment. Those skilled in the art can select a value in the range of 0.04W / (m·K) to 0.08W / (m·K) based on their needs.

[0080] The thermal conductivity of the second thermal insulation potting compound layer is 0.04 W / (m·K) to 0.08 W / (m·K). For example, the thermal conductivity of the second thermal insulation potting compound layer can be 0.04 W / (m·K), 0.045 W / (m·K), 0.047 W / (m·K), 0.05 W / (m·K), 0.053 W / (m·K), 0.045 W / (m·K), 0.047 W / (m·K), 0.06 W / (m·K), 0.063 W / (m·K), 0.065 W / (m·K), 0.067 W / (m·K), 0.07 W / (m·K), 0.073 W / (m·K), 0.075 W / (m·K), or 0.077 W / (m·K). The specific value of the thermal conductivity of the second thermal insulation potting compound layer is not limited in this embodiment. Those skilled in the art can select a value in the range of 0.04W / (m·K) to 0.08W / (m·K) based on their needs.

[0081] In this embodiment, the thermal conductivity of the first thermal insulation potting compound layer and the second thermal insulation potting compound layer can be designed to be the same or different.

[0082] like Figures 5-8 As shown in a specific embodiment of this application, the central cold plate device 300 is provided with a through hole 301 that penetrates both sides along a first direction, and the first thermally conductive potting compound layer 700 is located on the upper side of the central cold plate device 300.

[0083] When potting compound is poured from the upper side of the central cold plate assembly 300, the potting compound located on the upper side of the central cold plate assembly 300 forms a first thermally conductive potting compound layer 700, and the potting compound flowing into the lower side of the central cold plate assembly 300 through the through hole 301 forms a second thermally conductive potting compound layer 800.

[0084] Without the through hole 301, the middle cold plate assembly 300 would require two separate glue-filling operations for the upper and lower battery packs (first battery pack 100 and second battery pack 200). This would necessitate flipping the battery pack or designing a complex double-sided glue-filling device. The through hole 301 design allows the glue to automatically fill both upper and lower layers with a single pour from one side, significantly shortening the production cycle and greatly improving production efficiency.

[0085] The adhesive layers formed by two separate injections are independent, with a cold plate interface between them, which can easily lead to microscopic defects. In contrast, a single injection, flowing through the through-hole 301, can form a continuous, interface-free integral adhesive layer on both the top and bottom sides. The adhesive flows naturally and removes bubbles under gravity, minimizing injection defects such as air bubbles and cavities, and ensuring the density and integrity of the adhesive.

[0086] The potting compound within the through-hole 301 forms a highly efficient thermal bridge connecting the upper and lower battery packs. Heat can be conducted not only through the metal body of the central cold plate device 300, but also through these holes filled with thermally conductive potting compound, allowing for direct heat exchange between the upper and lower layers. This results in a tighter thermal connection between the first battery pack 100 and the second battery pack 200, further reducing the temperature difference between them and achieving optimal thermal balance, which is crucial for battery life and performance consistency.

[0087] The potting compound encapsulates the central cold plate assembly 300 through the through-hole 301, firmly bonding the central cold plate assembly 300, the first thermally conductive potting compound layer 700, the second thermally conductive potting compound layer 800, the first battery pack 100, and the second battery pack 200 into a complete mechanical whole, rather than a simple laminated structure. This structure can more effectively transfer and disperse stress, has extremely high overall rigidity and strength, and its vibration and impact resistance far exceeds that of a layered design, especially in extreme situations such as vehicle collisions, where its advantages are obvious.

[0088] The central cold plate assembly 300 includes multiple medium flow channels 302 for the flow of heat exchange medium. Adjacent medium flow channels 302 are separated by an isolator, and a through hole 301 is provided on the isolator. It should be noted that the through hole 301 cannot communicate with the medium flow channel 302 to avoid leakage of the heat exchange medium in the medium flow channel 302.

[0089] Furthermore, the surfaces of the central cold plate device 300 facing the first battery pack 100 and the second battery pack 200 are both flat surfaces without openings. That is, in this embodiment, the central cold plate device 300 may not have the through hole 301 as in the above embodiment. In this embodiment, multiple potting processes are required to form the first thermal insulation potting compound layer, the first thermally conductive potting compound layer, the second thermal insulation potting compound layer, and the second thermally conductive potting compound layer.

[0090] like Figure 1 and Figure 4 As shown in a specific embodiment of this application, the first battery pack 100 and the second battery pack 200 include multiple rows of battery cells arranged along a second direction, with a side cooling plate device 400 provided between adjacent rows of battery cells. The side cooling plate device 400 is used for heat exchange with the side of the individual battery cells, rather than the end face. Specifically, the side cooling plate device 400 can be provided between any two adjacent rows of battery cells; it can also be provided only between adjacent rows of battery cells where necessary; of course, the side cooling plate device 400 can also be provided on the outer side of the battery cells at the edge (both sides along the second direction). This embodiment does not limit the location and number of the side cooling plate devices 400, and those skilled in the art can choose the number and location of the side cooling plate devices 400 according to their needs.

[0091] In this embodiment, the individual cells within the battery pack can be cylindrical cells, and the side cooling plate device 400 has a curved surface that conforms to the outer circumferential surface of the cylindrical cell. This arrangement maximizes the contact area, with the curved surface completely conforming to the circumferential surface of the cylindrical cell, transforming line contact or small-area contact into large-area surface contact, reducing thermal resistance, and allowing the large amount of heat generated by the auxiliary battery during high-speed charging and discharging to be conducted to the side cooling plate device 400 more quickly. During charging and discharging, the heat from the cylindrical cell is mainly dissipated from the outer circumferential surface of the cylinder. The side cooling plate device 400 directly contacts the largest heat dissipation surface, resulting in the shortest cooling path and highest efficiency.

[0092] Efficient side cooling can quickly dissipate heat, preventing heat buildup inside individual cells and resulting in a more uniform temperature distribution. Superior temperature uniformity is crucial for extending battery life and maintaining capacity consistency, effectively preventing premature aging of some cells within the battery pack due to localized overheating.

[0093] Furthermore, the side cooling plate devices 400 of the first battery pack 100 can be connected in parallel. This arrangement ensures that all battery columns in the first battery pack 100 are under almost identical cooling conditions. The parallel connection of the side cooling plate devices 400 guarantees equal pressure drops in each branch. In this design, when the heat exchange medium flows from the manifold into the first layer of cooling plate units, it simultaneously and parallelly enters all the parallel side cooling plate devices 400. The inlet temperature, pressure, and flow rate of the heat exchange medium flowing through each side cooling plate device 400 of the first battery pack 100 are essentially the same. This ensures highly consistent heat dissipation for all batteries in the first battery pack 100, eliminating temperature differences between batteries within the same layer from a cooling perspective, which is crucial for extending the overall lifespan of the battery pack.

[0094] Similarly, the side cooling plate devices 400 of the second battery pack 200 can also be connected in parallel, with the same technical effect as above, which will not be elaborated on here.

[0095] As illustrated in this application, unless the context clearly indicates otherwise, the words "a," "an," "an," and / or "the" do not specifically refer to the singular and may also include the plural. Generally speaking, the terms "comprising" and "including" only indicate the inclusion of expressly identified steps and elements, which do not constitute an exclusive list, and the method or apparatus may also include other steps or elements. An element defined by the phrase "comprising an..." does not exclude the presence of other identical elements in the process, method, product, or apparatus that includes the element.

[0096] In the description of this application, unless otherwise expressly defined, terms such as "setup," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this application in conjunction with the specific content of the technical solution.

[0097] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0098] This document uses specific examples to illustrate the principles and implementation methods of this application. The descriptions of the embodiments above are only for the purpose of helping to understand the method and core ideas of this application. It should be noted that those skilled in the art can make several improvements and modifications to this application without departing from the principles of this application, and these improvements and modifications also fall within the protection scope of the claims of this application.

Claims

1. A battery pack, characterized in that, include: The first battery pack (100) and the second battery pack (200) are stacked along the first direction, and each individual cell of the first battery pack (100) is electrically connected through the first conductive bus assembly (500), and each individual cell of the second battery pack (200) is electrically connected through the second conductive bus assembly (600). A central cold plate device (300) is disposed between the first battery pack (100) and the second battery pack (200). The first conductive bus assembly (500) and the second conductive bus assembly (600) are thermally bonded to the two side surfaces of the central cold plate device (300). The two side surfaces are the surfaces of the central cold plate device (300) arranged along the first direction. A first thermally conductive potting compound layer (700) is disposed between the first battery pack (100) and the central cold plate device (300). A second thermally conductive potting compound layer (800) is disposed between the second battery pack (200) and the central cold plate device (300).

2. The battery pack as described in claim 1, characterized in that, The first conductive bus assembly (500) is embedded in the first thermally conductive potting compound layer (700); And / or, The second conductive bus assembly (600) is embedded in the second thermally conductive potting compound layer (800).

3. The battery pack as described in claim 1, characterized in that, Both the first thermally conductive potting compound layer (700) and the second thermally conductive potting compound layer (800) are insulating foam layers.

4. The battery pack as described in claim 1, characterized in that, The first thermally conductive potting compound layer (700) fills the gap between the first battery pack (100) facing the middle cold plate device (300) and the middle cold plate device (300), and along the first direction, the thickness covering the first battery pack (100) is L1mm, and the value of L1mm is 2mm~4mm. And / or, The second thermally conductive potting compound layer (800) fills the gap between the second battery pack (200) facing the middle cold plate device (300) and the middle cold plate device (300), and along the first direction, the thickness covering the second battery pack (200) is L2mm, and the value of L2mm is in the range of 2mm~4mm.

5. The battery pack as described in claim 1, characterized in that, The gaps between the individual cells of the first battery pack (100) are filled with a first heat-insulating potting compound layer, and the first heat-insulating potting compound layer and the first thermally conductive potting compound layer (700) are arranged along the first direction. And / or, The gaps between the individual cells of the second battery pack (200) are filled with a second heat-insulating potting compound layer, and the second heat-insulating potting compound layer and the second thermally conductive potting compound layer (800) are arranged along the first direction.

6. The battery pack as described in claim 5, characterized in that, The first thermal insulation potting compound layer and the second thermal insulation potting compound layer are made of the same material, and the first thermally conductive potting compound layer (700) and the second thermally conductive potting compound layer (800) are made of the same material; The thermal conductivity of the first thermally conductive potting compound layer (700) and the second thermally conductive potting compound layer (800) is greater than that of the first thermally insulating potting compound layer and the second thermally insulating potting compound layer. The thermal conductivity of the first thermally conductive potting compound layer (700) and the second thermally conductive potting compound layer (800) are 0.4 W / (m·K) ~ 0.6 W / (m·K), respectively. The thermal conductivity of the first thermal insulation potting compound layer and the second thermal insulation potting compound layer are 0.04 W / (m·K) to 0.08 W / (m·K), respectively.

7. The battery pack as described in claim 1, characterized in that, The surfaces of the central cold plate device (300) facing the first battery pack (100) and the second battery pack (200) are flat surfaces without openings.

8. The battery pack as claimed in claim 1, characterized in that, The central cold plate device (300) is provided with a through hole (301) that penetrates both sides along the first direction, and the first thermally conductive potting compound layer (700) is located on the upper side of the central cold plate device (300). When potting compound is poured onto the upper side of the central cold plate device (300), the potting compound located on the upper side of the central cold plate device (300) forms the first thermally conductive potting compound layer (700), and the potting compound flowing into the lower side of the central cold plate device (300) through the through hole (301) forms the second thermally conductive potting compound layer (800).

9. The battery pack as described in claim 8, characterized in that, The central cold plate device (300) includes multiple medium flow channels (302) for the flow of heat exchange medium. The through hole (301) is located at the position of the medium flow channel (302). The medium flow channel (302) with the through hole (301) is the first medium flow channel. An isolation block (303) is provided in the first medium flow channel, and the through hole (301) is opened on the isolation block (303) to isolate it from the first medium flow channel.

10. The battery pack according to any one of claims 1-9, characterized in that, The first battery pack (100) and the second battery pack (200) include multiple rows of battery columns arranged along a second direction. Each battery column includes multiple individual cells arranged along a third direction. A side cooling plate device (400) is provided between two adjacent rows of battery columns. The first direction, the second direction and the third direction are perpendicular to each other.

11. The battery pack as claimed in claim 10, characterized in that, The single cell is a cylindrical cell, and the side cold plate device (400) has a curved surface that fits into the outer peripheral surface of the cylindrical cell.

Images