Battery pack and electronic device

Abstract

The application provides a battery pack and an electronic device. The battery pack comprises a shell having a receiving cavity, the shell comprising a frame which is a hollow structure; at least two battery modules located in the receiving cavity, the at least two battery modules being arranged at intervals along the thickness direction of the battery pack, the battery module comprising a plurality of battery cells, the battery cell having a first explosion-proof valve; and a liquid cooling assembly comprising a liquid cooling plate, the liquid cooling plate having a liquid cooling flow channel for the flow of cooling liquid, and being located between the at least two battery modules, the liquid cooling plate being used for heat exchange with the at least two battery modules; the liquid cooling plate further has a gas passage, the first explosion-proof valve in the at least two battery modules all facing the liquid cooling plate, the gas passage being used for connecting the first explosion-proof valve and the frame; and a second explosion-proof valve being arranged on the frame and being in communication with the frame. The application can quickly and directionally exhaust, thereby improving the exhaust efficiency; in addition, the cooling liquid can be used to cool the high-temperature gas during the exhaust of the gas.

Description

Technical Field

[0001] This application relates to a battery pack and electronic device, belonging to the field of new energy battery technology. Background Technology

[0002] With the rapid development of electric vehicles, energy storage systems and other fields, batteries, as core components, are increasingly being used in power battery packs, leading to greater attention being paid to their safety.

[0003] In the process of conceiving and implementing this application, the applicant discovered at least the following problems: As an important component in the battery pack, when the battery cell is subjected to high temperature or external force, it will generate a large amount of high-temperature gas, which will then break through the explosion-proof valve and be directly discharged into the battery pack housing. This high-temperature gas will further affect other uncontrolled battery cells, causing thermal diffusion and exacerbating the safety problems caused by uncontrolled battery cells.

[0004] The preceding description is intended to provide general background information and does not necessarily constitute prior art. Utility Model Content

[0005] This application provides a battery pack and electronic device that can quickly and directionally exhaust gas, thereby improving the efficiency of exhaust; in addition, a coolant can be used to cool the high-temperature gas during the gas exhaust process.

[0006] This application provides a battery pack, including:

[0007] The outer shell has a receiving cavity, and the outer shell includes a frame, which is a hollow structure;

[0008] At least two battery modules are located within the receiving cavity, and the at least two battery modules are spaced apart along the thickness direction of the battery pack. Each battery module includes multiple battery cells, and each battery cell has a first explosion-proof valve.

[0009] A liquid cooling assembly includes a liquid cooling plate having liquid cooling channels for coolant flow and located between at least two battery modules, the liquid cooling plate being used for heat exchange with at least two battery modules;

[0010] The liquid cooling plate also has a gas channel, and the first explosion-proof valves in at least two battery modules face the liquid cooling plate. The gas channel is used to connect the first explosion-proof valves and the frame.

[0011] The second explosion-proof valve is located on the frame and is connected to the frame.

[0012] The beneficial effects of this application are as follows: By integrating the gas channel and the liquid cooling channel into a single liquid cooling plate, the high-temperature gas can be cooled by the coolant during the gas discharge process, reducing the severity of thermal runaway and achieving thermoelectric separation; at the same time, by installing a second explosion-proof valve on the frame and designing the frame as a hollow structure connected to the gas channel, when a cell runs away, the high-temperature gas can be discharged to both sides of the frame simultaneously and in a directional manner, improving the exhaust efficiency; in addition, by installing battery modules on the upper and lower sides of a single cold plate, the energy density and integration level of the battery pack are improved.

[0013] In some alternative implementations, the first explosion-proof valve is located in the middle of the cell along the width direction of the battery pack;

[0014] There are at least two liquid cooling channels along the width of the battery pack, and the gas channel is located in the middle of the liquid cooling plate and between at least two liquid cooling channels.

[0015] It should be noted that the liquid cooling plate has at least two liquid cooling channels, and the gas channel is located in the middle of the liquid cooling plate, i.e., between the two liquid cooling channels. This allows the coolant to flow efficiently across both sides of the liquid cooling plate, ensuring that the liquid cooling plate can effectively cool the high-temperature gas during the gas discharge process, thereby reducing the risk of thermal runaway.

[0016] In some alternative embodiments, the housing also includes a bottom cover, and the battery pack also includes a buffer disposed between the bottom cover and the battery modules facing the bottom cover.

[0017] It should be noted that the use of buffer components further enhances the stability of the connection between the battery module and the bottom cover plate, preventing direct contact between the battery module and the bottom cover plate, reducing wear and physical damage, and extending the service life of the components.

[0018] In some alternative implementations, the liquid cooling plate has an adhesive area and an explosion-proof area, with the projection of the gas passage located in the explosion-proof area along the thickness direction of the battery pack.

[0019] The battery pack also includes thermally conductive structural adhesive, which is placed in the bonding area and located between the liquid cooling plate and the battery module;

[0020] The battery pack also includes a rubber baffle strip located on the outer periphery of the explosion-proof area.

[0021] It should be noted that by clearly defining the adhesive area and the explosion-proof area on the liquid cooling plate, the design ensures the independence and effectiveness of gas emission and thermal management functions. The installation of the adhesive strip further enhances the system's reliability and prevents mutual interference between different functional areas.

[0022] In some alternative embodiments, at least two battery modules include a first battery unit and a second battery unit. The first battery unit includes a plurality of first cells, and the second battery unit includes a plurality of second cells. The first explosion-proof valve includes a first sub-explosion-proof valve and a second sub-explosion-proof valve. The first sub-explosion-proof valve is disposed in the first cell, and the second sub-explosion-proof valve is disposed in the second cell.

[0023] The first sub-explosion-proof valve faces the first side of the liquid cooling plate, and the second sub-explosion-proof valve faces the second side of the liquid cooling plate.

[0024] It should be noted that the first and second battery cells are respectively positioned on opposite sides of the liquid cooling plate. The first sub-explosion-proof valve of the first cell faces the first side of the liquid cooling plate, while the second sub-explosion-proof valve of the second cell faces the second side of the liquid cooling plate. This double-sided layout allows the liquid cooling plate to simultaneously manage the thermal performance of the battery cells on both sides, improving cooling efficiency.

[0025] In some optional embodiments, the liquid cooling plate is further provided with a first guide hole and a second guide hole, both of which are connected to the gas channel;

[0026] The first guide hole is located on the first surface of the liquid cooling plate and abuts against the inside of the first sub-explosion-proof valve;

[0027] The second guide hole is located on the second side of the liquid cooling plate and abuts against the inside of the second sub-explosion-proof valve.

[0028] It should be noted that by setting a first guide hole and a second guide hole on the liquid cooling plate, and connecting the first guide hole and the second guide hole to the gas channel respectively, the first guide hole directly abuts against the first sub-explosion-proof valve, while the second guide hole directly abuts against the second sub-explosion-proof valve. This design ensures that when thermal runaway occurs in the battery cell, gas can quickly enter the gas channel through the guide hole, achieving precise gas guidance and improving the safety of the battery pack.

[0029] In some optional embodiments, the outer peripheral side of the first guide hole has a first guide protrusion, which surrounds the outer periphery of the first sub-explosion-proof valve;

[0030] The outer periphery of the second guide hole has a second guide protrusion, which surrounds the outer periphery of the second sub-explosion-proof valve.

[0031] It should be noted that a first guide protrusion is provided on the outer periphery of the first guide hole, which surrounds the outer periphery of the first sub-explosion-proof valve; similarly, a second guide protrusion is provided on the outer periphery of the second guide hole, which surrounds the outer periphery of the second sub-explosion-proof valve, ensuring a tight connection between the guide hole and the explosion-proof valve, improving sealing performance and preventing gas leakage.

[0032] In some alternative implementations, the frame includes at least two first borders and at least two second borders connected to form a receiving cavity;

[0033] The frame also includes at least two first crossbeams and at least two second crossbeams. The at least two first crossbeams are spaced apart along the length of the battery pack and located on opposite sides of the first battery cell. One end of the first crossbeam is connected to a gas channel, and the other end of the first crossbeam is connected to a channel of the first frame.

[0034] At least two second crossbeams are spaced apart along the length of the battery pack on opposite sides of the second battery cell.

[0035] It should be noted that the first crossbeam is matched with the first battery unit and serves as a channel for the emission of high-temperature gas from one of the first cells in the first battery unit; the second crossbeam is matched with the second battery unit to support the second battery unit. When one of the second cells in the second battery unit malfunctions, the high-temperature gas generated there flows to the first crossbeam through the gas channel, ensuring that the gas can be quickly discharged from the cell and guided to the channel of the frame through the first crossbeam, thus achieving efficient gas emission.

[0036] In some alternative embodiments, the liquid cooling assembly further includes a first plug and a second plug, which are disposed on opposite sides of the liquid cooling plate along the length of the battery pack;

[0037] The first plug connects the gas passage and the passage of the first crossbeam, and the second plug connects the gas passage and the passage of the first crossbeam.

[0038] It should be noted that the first and second plugs are respectively located on opposite sides of the liquid cooling plate and arranged along the length of the battery pack. The first and second plugs are respectively connected between the gas channel and the channel of the first crossbeam, ensuring that the gas from the gas channel of the liquid cooling plate can be accurately guided to the channel of the first crossbeam, achieving efficient gas discharge.

[0039] In addition, this application also provides an electronic device, including a battery pack.

[0040] The battery pack and electronic device provided in this application include a battery pack; the battery pack includes a shell with a receiving cavity, the shell includes a frame, and the frame has a hollow structure; at least two battery modules are located in the receiving cavity, the at least two battery modules are spaced apart along the thickness direction of the battery pack, the battery modules include multiple cells, and the cells have a first explosion-proof valve; a liquid cooling assembly includes a liquid cooling plate, the liquid cooling plate has a liquid cooling channel for coolant flow, and is located between the at least two battery modules, the liquid cooling plate is used for heat exchange with the at least two battery modules; the liquid cooling plate also has a gas channel, the first explosion-proof valves in the at least two battery modules all face the liquid cooling plate, the gas channel is used to connect the first explosion-proof valves and the frame; a second explosion-proof valve is located on the frame and communicates with the frame.

[0041] The liquid-cooled plate, which integrates the gas channel and the liquid cooling channel, can cool the high-temperature gas during the gas discharge process, reducing the severity of thermal runaway and achieving thermoelectric separation. At the same time, by installing a second explosion-proof valve on the frame and designing the frame as a hollow structure connected to the gas channel, when a cell runs away, the high-temperature gas can be discharged to both sides of the frame simultaneously and in a directional manner, improving the exhaust efficiency. In addition, by installing battery modules on the upper and lower sides of a single cold plate, the energy density and integration of the battery pack are improved. Attached Figure Description

[0042] The above and other objects, features, and advantages of embodiments of this application will become more readily understood through the following detailed description with reference to the accompanying drawings. In the drawings, several embodiments of this application will be described by way of example and non-limitation, wherein:

[0043] Figure 1 This is a schematic diagram of the battery pack structure according to an embodiment of this application;

[0044] Figure 2 This is an exploded view of the battery pack according to an embodiment of this application;

[0045] Figure 3 This is a cross-sectional view of the liquid cooling plate in the battery pack according to an embodiment of this application;

[0046] Figure 4 This is a schematic diagram of the structure of the battery module in the battery pack according to an embodiment of this application;

[0047] Figure 5 This is a top view of the battery pack according to an embodiment of this application;

[0048] Figure 6 for Figure 5 A cross-sectional view along the AA direction;

[0049] Figure 7 for Figure 6 A magnified view of a section at point I;

[0050] Figure 8 This is a top view of the liquid cooling assembly in the battery pack according to an embodiment of this application;

[0051] Figure 9 for Figure 8 Enlarged view of section II in the middle;

[0052] Figure 10 This is a bottom view of the liquid cooling assembly in the battery pack according to an embodiment of this application;

[0053] Figure 11 This is an exploded view of the outer casing of the battery pack according to an embodiment of this application;

[0054] Figure 12 This is a schematic diagram showing the exhaust direction at cell B in the battery pack of this application embodiment;

[0055] Figure 13 This is an exploded view of the assembly of the first crossbeam and the first frame in the battery pack according to an embodiment of this application;

[0056] Figure 14 This is an exploded view of the liquid cooling component in the battery pack according to an embodiment of this application.

[0057] Figure label:

[0058] 100-battery pack;

[0059] 110 - Outer casing;

[0060] 111-Framework;

[0061] 1111 - First border;

[0062] 1112 - Second border;

[0063] 1113 - First crossbeam;

[0064] 1114 - Second crossbeam;

[0065] 112 - Bottom guard plate;

[0066] 120-Battery Module;

[0067] 121 - First battery cell;

[0068] 1211 - First Cell;

[0069] 122 - Second battery cell;

[0070] 1221 - Second cell;

[0071] 123 - First explosion-proof valve;

[0072] 1231 - First sub-explosion-proof valve;

[0073] 1232 - Second sub-explosion-proof valve;

[0074] 124-Pole Column;

[0075] 130 - Liquid cooling assembly;

[0076] 131 - First plug;

[0077] 132 - Second plug;

[0078] 133 - Liquid cooling plate;

[0079] 1331 - First guide hole;

[0080] 1332 - Second guide hole;

[0081] 1333 - Liquid cooling channel;

[0082] 1334 - Gas Channel;

[0083] 1335 - First guide protrusion;

[0084] 1336 - Second guide protrusion;

[0085] 140 - Second explosion-proof valve;

[0086] 150-Buffer;

[0087] 160 - Thermally conductive structural adhesive. Detailed Implementation

[0088] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, 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, 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. All other obtained embodiments are within the scope of protection of this application. In the absence of conflict, the following embodiments and features can be combined with each other.

[0089] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0090] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0091] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0092] In the process of conceiving and implementing this application, the applicant discovered at least the following problems: As an important component in the battery pack, when the battery cell is subjected to high temperature or external force, it will generate a large amount of high-temperature gas, which will then break through the explosion-proof valve and be directly discharged into the battery pack housing. This high-temperature gas will further affect other uncontrolled battery cells, causing thermal diffusion and exacerbating the safety problems caused by uncontrolled battery cells.

[0093] The battery pack proposed in this application utilizes a liquid-cooled plate that integrates gas channels and liquid-cooled flow channels. During the gas discharge process, the coolant can cool the high-temperature gas, reducing the severity of thermal runaway and achieving thermoelectric separation. Simultaneously, by installing a second explosion-proof valve on the frame and designing the frame as a hollow structure connected to the gas channel, when a cell experiences runaway, the high-temperature gas can be discharged simultaneously and directionally to both sides of the frame, improving the exhaust efficiency. Furthermore, by installing battery modules on both the upper and lower sides of a single cold plate, the energy density and integration level of the battery pack are improved.

[0094] The battery pack provided in this application will be described in detail below with reference to specific embodiments.

[0095] Figure 1 This is a schematic diagram of the battery pack structure according to an embodiment of this application. Figure 2 This is an exploded view of the battery pack according to an embodiment of this application. Figure 3 This is a cross-sectional view of the liquid cooling plate in the battery pack of this application embodiment.

[0096] like Figures 1 to 3 As shown in the figure, this application embodiment proposes a battery pack 100, including:

[0097] The outer shell 110 has a receiving cavity, and the outer shell 110 includes a frame 111, which is a hollow structure;

[0098] At least two battery modules 120 are located within the receiving cavity. The at least two battery modules 120 are spaced apart along the thickness direction of the battery pack 100. Each battery module 120 includes multiple battery cells, and each battery cell has a first explosion-proof valve 123.

[0099] The liquid cooling assembly 130 includes a liquid cooling plate 133, which has a liquid cooling channel 1333 for coolant flow and is located between at least two battery modules 120. The liquid cooling plate 133 is used to exchange heat with at least two battery modules 120.

[0100] The liquid cooling plate 133 also has a gas passage 1334, and the first explosion-proof valves 123 in at least two battery modules 120 face the liquid cooling plate 133. The gas passage 1334 is used to connect the first explosion-proof valves 123 and the frame 111.

[0101] The second explosion-proof valve 140 is located on the frame 111 and is connected to the frame 111.

[0102] It is understandable that the purpose of the receiving cavity is to house the battery module 120. It is also easy to understand that the receiving cavity is sealed to prevent side reactions from occurring in the internal system of the battery cells in the battery module 120, which would affect the performance of the battery cells.

[0103] For example, the size or shape of the receiving cavity is matched with the size and shape of the battery module 120. Specifically, it can be adjusted according to the actual situation. This application embodiment does not impose too many restrictions here.

[0104] In one possible implementation, the housing 110 can be a rectangular structure, and the size of the housing 110 can be greater than or equal to the size of the battery module 120, so that the housing 110 can support the battery module 120.

[0105] The dimensions of the outer shell 110 can be set according to actual needs, and this embodiment of the application does not impose too many restrictions here.

[0106] In addition, it should be noted that the shape of the outer shell 110 is not limited in this embodiment. For example, the outer shell 110 can be a regular shape such as a cuboid or a cylinder. Of course, the outer shell 110 can also be other irregular shapes.

[0107] In this embodiment, the battery module 120 can be configured as a rectangular structure. The battery module 120 can be located inside the housing 110.

[0108] Understandably, the housing 110 can be used to support the battery module 120.

[0109] like Figure 2 As shown, it should be noted that X represents the length direction of the battery pack 100, Y represents the width direction of the battery pack 100, and Z represents the thickness direction of the battery pack 100.

[0110] It should be noted that the battery module 120 is a battery device that can integrate multiple battery cells. Multiple cells connected in series and parallel can provide a larger capacity, offering advantages such as high integration and high structural stability. To enable multiple cells to be connected in series and parallel, they can be connected via a busbar.

[0111] Figure 4 This is a schematic diagram of the structure of the battery module in the battery pack according to an embodiment of this application.

[0112] like Figure 4 As shown, in some embodiments, the battery cell also has two terminals 124, which have opposite polarities, one terminal 124 being the positive terminal and the other terminal 124 being the negative terminal. The first explosion-proof valve 123 is located at the top of the battery cell, and the terminals 124 are located on the side of the battery cell.

[0113] In some embodiments, along the length of the battery module 120, an isolation plate is provided between two adjacent cells. The isolation plate is located between two adjacent cells and its function is to absorb and alleviate the mechanical stress between the cells, preventing the cells from being damaged by vibration or impact during transportation or use.

[0114] In some embodiments, the separator can be foam, which typically has good thermal insulation properties. Placing it between the large surfaces of two adjacent cells can effectively reduce heat transfer between the cells. This helps control the temperature distribution inside the battery module 120, prevents localized overheating, and improves battery safety and lifespan.

[0115] In some embodiments, the separator is an aerogel separator with double-sided adhesive, which has the function of slowing down heat diffusion between battery cells.

[0116] like Figure 3 As shown, it should be noted that the liquid cooling plate 133 has a liquid cooling channel 1333 and a gas channel 1334. The liquid cooling channel 1333 and the gas channel 1334 are not connected. Coolant flows in the liquid cooling channel 1333 for the purpose of exchanging heat with the battery module 120.

[0117] In some embodiments, the battery pack 100 further includes a second explosion-proof valve 140, which is disposed on the frame 111. When the battery cell is subjected to high temperature or external force, a large amount of high-temperature gas is generated, which breaks through the first explosion-proof valve 123. The gas can be quickly discharged into the hollow structure of the frame 111 through the gas channel 1334, and then discharged directionally to the outside of the battery pack 100 through the second explosion-proof valve 140, thereby improving the efficiency of venting.

[0118] With the above configuration, namely, the liquid cooling plate 133, which integrates the gas channel 1334 and the liquid cooling channel 1333, can cool the high-temperature gas during the gas discharge process, reduce the severity of thermal runaway, and complete thermoelectric separation. At the same time, by installing a second explosion-proof valve 140 on the frame 111 and designing the frame 111 as a hollow structure and connecting it to the gas channel 1334, when a cell runs away, the high-temperature gas can be discharged to both sides of the frame 111 simultaneously and in a directional manner, improving the exhaust efficiency. In addition, by installing battery modules 120 on the upper and lower sides of a single cold plate, the energy density and integration level of the battery pack 100 are improved.

[0119] In some alternative embodiments, the first explosion-proof valve 123 is located in the middle of the battery cell along the width direction of the battery pack 100;

[0120] There are at least two liquid cooling channels 1333 along the width direction of the battery pack 100, and the gas channel 1334 is located in the middle of the liquid cooling plate 133 and between at least two liquid cooling channels 1333.

[0121] It should be noted that the liquid cooling plate 133 is provided with at least two liquid cooling channels 1333, and the gas channel 1334 is located in the middle of the liquid cooling plate 133, that is, between the two liquid cooling channels 1333. This allows the coolant to flow efficiently through both sides of the liquid cooling plate 133, ensuring that the liquid cooling plate 133 can effectively cool the high-temperature gas during the gas discharge process, thereby reducing the risk of thermal runaway.

[0122] Furthermore, the first explosion-proof valve 123 is positioned in the middle of the battery cell and arranged along the width of the battery pack 100, ensuring that gas can be rapidly discharged from the center of the battery cell in the event of thermal runaway. This design helps to uniformly guide high-temperature gas into the gas channel 1334, reducing the residence time of gas inside the battery pack 100.

[0123] Furthermore, the central location design of the gas channel 1334 ensures that the gas can be quickly and evenly guided to the hollow structure of the frame 111 and discharged through the second explosion-proof valve 140. This directional exhaust design reduces the impact of high-temperature gas on other parts of the battery pack 100, further improving the overall safety of the battery pack 100.

[0124] like Figure 2 As shown, in some alternative embodiments, the housing 110 further includes a bottom protective plate 112, and the battery pack 100 further includes a buffer 150 disposed between the bottom protective plate 112 and the battery module 120 facing the bottom protective plate 112.

[0125] It should be noted that the use of buffer 150 further enhances the stability of the connection between battery module 120 and bottom cover plate 112, which can prevent direct contact between battery module 120 and bottom cover plate 112, reduce wear and physical damage, and extend the service life of the components.

[0126] The presence of the buffer 150 can effectively absorb and mitigate mechanical stress caused by vibration, impact or thermal expansion, protecting the battery module 120 and the bottom protective plate 112 from damage, thereby improving the durability and reliability of the battery pack 100.

[0127] In some embodiments, a buffer 150 is provided between the battery module 120 and the bottom cover plate 112 as needed to improve the reliability of the bottom cover plate 112 pressing the battery module 120.

[0128] In some embodiments, the buffer 150 can be foam with double-sided adhesive on both sides to enhance the connection and improve the reliability of the bottom guard plate 112 pressing the battery module 120.

[0129] In some alternative embodiments, the liquid cooling plate 133 has an adhesive area and an explosion-proof area, and the projection of the gas channel 1334 is located in the explosion-proof area along the thickness direction of the battery pack 100.

[0130] The battery pack 100 also includes thermally conductive structural adhesive 160, which is disposed in the bonding area and located between the liquid cooling plate 133 and the battery module 120.

[0131] The battery pack 100 also includes a rubber strip, which is located on the outer periphery of the explosion-proof area.

[0132] It should be noted that by clearly defining the adhesive area and the explosion-proof area on the liquid cooling plate 133, the design ensures the independence and effectiveness of gas emission and thermal management functions. The installation of the adhesive strip further enhances the reliability of the system and prevents mutual interference between different functional areas.

[0133] Furthermore, the liquid cooling plate 133 is divided into an adhesive area and an explosion-proof area, with the projection of the gas channel 1334 located in the explosion-proof area. This regional design ensures the independence and specialization of different functional areas; the explosion-proof area is specifically for handling gas emissions, while the adhesive area is used for heat conduction and structural stability.

[0134] In some embodiments, at least two thermally conductive structural adhesives 160 are provided in the bonding area. These thermally conductive structural adhesives 160 are located between the liquid cooling plate 133 and the battery module 120, which can effectively conduct the heat generated by the battery module 120 to the liquid cooling plate 133, improve the heat conduction efficiency, and ensure that the battery module 120 maintains a suitable temperature range during operation, thereby extending the battery's service life and performance stability.

[0135] Furthermore, the adhesive-blocking strip is positioned on the outer periphery of the explosion-proof zone to restrict the diffusion of the thermally conductive structural adhesive 160. Specifically, it restricts the flow of the thermally conductive structural adhesive 160, preventing it from flowing into the gas channel 1334 area and affecting the exhaust of high-temperature gas. This ensures the positioning and effectiveness of the thermally conductive structural adhesive 160 and also prevents the adhesive from entering the explosion-proof zone, thus affecting the function of the gas channel 1334 and the efficiency of gas exhaust.

[0136] Figure 5 This is a top view of the battery pack according to an embodiment of this application. Figure 6 for Figure 5 Sectional view along the AA direction. Figure 7 for Figure 6 A magnified view of a section at point I.

[0137] like Figures 2 to 7As shown, in some optional embodiments, at least two battery modules 120 include a first battery unit 121 and a second battery unit 122. The first battery unit 121 includes a plurality of first cells 1211, and the second battery unit 122 includes a plurality of second cells 1221. The first explosion-proof valve 123 includes a first sub-explosion-proof valve 1231 and a second sub-explosion-proof valve 1232. The first sub-explosion-proof valve 1231 is disposed on the first cell 1211, and the second sub-explosion-proof valve 1232 is disposed on the second cell 1221.

[0138] The first sub-explosion-proof valve 1231 faces the first side of the liquid cooling plate 133, and the second sub-explosion-proof valve 1232 faces the second side of the liquid cooling plate 133.

[0139] It should be noted that the first battery cell 121 and the second battery cell 122 are respectively disposed on both sides of the liquid cooling plate 133. The first sub-explosion-proof valve 1231 of the first battery cell 1211 faces the first side of the liquid cooling plate 133, while the second sub-explosion-proof valve 1232 of the second battery cell 1221 faces the second side of the liquid cooling plate 133. This double-sided layout allows the liquid cooling plate 133 to perform thermal management on both sides of the battery cells simultaneously, improving cooling efficiency.

[0140] Since the first sub-explosion-proof valve 1231 and the second sub-explosion-proof valve 1232 face different sides of the liquid cooling plate 133, the gas passage 1334 is designed to ensure that when thermal runaway occurs in either cell, gas can quickly enter the gas passage 1334 of the liquid cooling plate 133 through the corresponding explosion-proof valve. This provides an independent gas discharge path and reduces cross-interference of gas within the battery pack 100.

[0141] Furthermore, the dual-sided explosion-proof valve design makes the gas emission path of each battery cell more direct and efficient, reducing the residence time of gas inside the battery pack 100, thereby reducing the impact of thermal runaway on other battery cells and improving the overall safety of the battery pack 100.

[0142] Figure 8 This is a top view of the liquid cooling assembly in the battery pack according to an embodiment of this application. Figure 9 for Figure 8 A magnified view of a section at point II. Figure 10 This is a bottom view of the liquid cooling component in the battery pack according to an embodiment of this application.

[0143] like Figures 1 to 10 As shown, in some optional embodiments, the liquid cooling plate 133 is further provided with a first guide hole 1331 and a second guide hole 1332, both of which are connected to the gas channel 1334.

[0144] The first guide hole 1331 is provided on the first surface of the liquid cooling plate 133 and abuts against the first sub-explosion-proof valve 1231;

[0145] The second guide hole 1332 is located on the second side of the liquid cooling plate 133 and abuts against the second sub-explosion-proof valve 1232.

[0146] It should be noted that by providing a first guide hole 1331 and a second guide hole 1332 on the liquid cooling plate 133, the first guide hole 1331 and the second guide hole 1332 are respectively connected to the gas channel 1334. The first guide hole 1331 directly abuts against the first sub-explosion-proof valve 1231, while the second guide hole 1332 directly abuts against the second sub-explosion-proof valve 1232. This design ensures that when the battery cell experiences thermal runaway, gas can quickly enter the gas channel 1334 through the guide holes, achieving precise gas guidance and improving the safety of the battery pack 100.

[0147] Furthermore, by directly connecting the guide hole to the gas channel 1334, the liquid cooling plate 133 can more effectively utilize the coolant to cool the high-temperature gas, which not only improves the efficiency of gas emission but also enhances the overall thermal management capability.

[0148] Specifically, a gas channel 1334 is machined along the central axis of the liquid cooling plate 133. Coolant flow channels are symmetrically machined on the left and right sides of the gas channel 1334. The side closer to the gas channel 1334 is the water inlet, and the side farther away from the gas channel 1334 is the water outlet. When high-temperature gas is discharged through the gas channel 1334, the coolant in the liquid cooling plate 133 can be used to cool the high-temperature gas. The upper and lower sides of the gas channel 1334 correspond to the first sub-explosion-proof valve 1231 and the second sub-explosion-proof valve 1232, respectively.

[0149] In some embodiments, the first guide hole 1331 has the same shape as the first sub-explosion-proof valve 1231 and is an elliptical countersunk hole. The inner edge of the countersunk hole is partially milled along the edge line so that the first sub-explosion-proof valve 1231 can break through the first guide hole 1331 and enter the gas channel 1334 when it is opened.

[0150] Correspondingly, the second guide hole 1332 has the same shape as the second sub-explosion-proof valve 1232 and is an elliptical countersunk hole. The inner edge of the countersunk hole is partially milled along the edge line so that the second sub-explosion-proof valve 1232 can break through the second guide hole 1332 and enter the gas passage 1334 when it is opened.

[0151] like Figure 4 , Figure 9 and Figure 10 As shown, in some optional embodiments, the outer periphery of the first guide hole 1331 has a first guide protrusion 1335, which surrounds the outer periphery of the first sub-explosion-proof valve 1231.

[0152] The outer periphery of the second guide hole 1332 has a second guide protrusion 1336, which surrounds the outer periphery of the second sub-explosion-proof valve 1232.

[0153] It should be noted that a first guide protrusion 1335 is provided on the outer periphery of the first guide hole 1331, which surrounds the outer periphery of the first sub-explosion-proof valve 1231; similarly, a second guide protrusion 1336 is provided on the outer periphery of the second guide hole 1332, which surrounds the outer periphery of the second sub-explosion-proof valve 1232, ensuring a tight connection between the guide hole and the explosion-proof valve, improving sealing performance, and preventing gas leakage.

[0154] Furthermore, the first guide protrusion 1335 is precisely engaged with the first sub-explosion-proof valve 1231, and the second guide protrusion 1336 is precisely engaged with the second sub-explosion-proof valve 1232. Through the design of the guide protrusions, the gas emission path is more clearly defined, reducing gas cross-interference between different cells. This helps to ensure that the gas of each cell can be emitted independently when multiple cells experience thermal runaway, thus reducing the risk of the overall system.

[0155] Figure 11 This is an exploded view of the outer casing of the battery pack according to an embodiment of this application. Figure 12 This is a schematic diagram showing the exhaust direction at cell B in the battery pack of this application embodiment. Figure 13 This is an exploded view of the assembly of the first crossbeam and the first frame in the battery pack of this application embodiment.

[0156] like Figures 2 to 13 As shown, in some alternative embodiments, the frame 111 includes at least two first borders 1111 and at least two second borders 1112, the at least two first borders 1111 and the at least two second borders 1112 being connected to form a receiving cavity;

[0157] The frame 111 also includes at least two first crossbeams 1113 and at least two second crossbeams 1114. The at least two first crossbeams 1113 are spaced apart along the length of the battery pack 100 on opposite sides of the first battery cell 121. One end of the first crossbeam 1113 is connected to the gas channel 1334, and the other end of the first crossbeam 1113 is connected to the channel of the first frame 1111.

[0158] At least two second crossbeams 1114 are spaced apart along the length of the battery pack 100 on opposite sides of the second battery cell 122.

[0159] It should be noted that the first crossbeam 1113 is matched with the first battery unit 121 and serves as a channel for the emission of high-temperature gas from one of the first cells 1211 in the first battery unit 121; the second crossbeam 1114 is matched with the second battery unit 122 to support the second battery unit 122. When one of the second cells 1221 in the second battery unit 122 goes out of control, the high-temperature gas generated there flows to the first crossbeam 1113 through the gas channel 1334, then flows to the first frame 1111 through the first crossbeam 1113, and is then discharged to the outside of the battery pack 100 through the second explosion-proof valve 140. This ensures that the gas can be quickly discharged from the cell and guided to the frame through the channels of different crossbeams, achieving efficient gas emission.

[0160] In other words, when either the first cell 1211 in the first battery unit 121 or the second cell 1221 in the second battery unit 122 goes out of control, the high-temperature gas generated will first flow through the gas channel 1334 to the first crossbeam 1113 before being discharged outwards.

[0161] Furthermore, the first crossbeam 1113 is not only used for gas emission but also enhances the structural stability of the frame 111. The first crossbeam 1113 provides additional support, increasing the rigidity and strength of the frame 111, making the battery pack 100 more stable when subjected to external pressure and vibration.

[0162] It should be noted that, through the connection of at least two first frame frames 1111 and at least two second frame frames 1112, the frame 111 structure may have higher stability and strength, the overall structural strength and stability are enhanced, and it can better resist external impacts and vibrations.

[0163] In some embodiments, at least two first borders 1111 are spaced apart along the width direction Y of the battery pack 100, and at least two second borders 1112 are spaced apart along the length direction X of the battery pack 100.

[0164] In some embodiments, the second explosion-proof valve 140 is disposed on the first frame 1111, and the first crossbeam 1113 is a hollow structure and is connected to the first frame 1111 to discharge hot gas, thereby achieving more efficient thermal management.

[0165] In some embodiments, the positions where the first frame 1111 on the left and right sides connects to the first crossbeams 1113 at both ends are machined with rectangular notches on one side in a diagonally symmetrical manner. The cavity of the gas channel 1334 of the first crossbeam 1113 is inserted into the notch and then welded. A second explosion-proof valve 140 is installed on the outer side of the corresponding position of the rectangular notch of the first frame 1111 on both the left and right sides. High-temperature gas can be discharged to the outside of the battery pack 100 through the second explosion-proof valve 140. The connection position between the second frame 1112 and the first frame 1111 is sealed, and high-temperature gas cannot continue to be transmitted from the first frame 1111 to the second frame 1112.

[0166] In some embodiments, the liquid cooling plate 133 is installed between the first crossbeam 1113 and the second crossbeam 1114, with the first crossbeam 1113 as the fixing point, and the second crossbeam 1114 and the liquid cooling plate 133 are fixed by long bolts.

[0167] Figure 14 This is an exploded view of the liquid cooling component in the battery pack according to an embodiment of this application.

[0168] like Figure 2 , Figure 11 and Figure 14 As shown, in some optional embodiments, the liquid cooling assembly 130 further includes a first plug 131 and a second plug 132, which are disposed on opposite sides of the liquid cooling plate 133 along the length direction of the battery pack 100.

[0169] The first plug 131 connects the gas channel 1334 and the channel of the first crossbeam 1113, and the second plug 132 connects the gas channel 1334 and the channel of the first crossbeam 1113.

[0170] It should be noted that the first plug 131 and the second plug 132 are respectively located on opposite sides of the liquid cooling plate 133 and arranged along the length of the battery pack 100. The first plug 131 and the second plug 132 are respectively connected between the gas channel 1334 and the channel of the first crossbeam 1113, ensuring that the gas from the gas channel 1334 of the liquid cooling plate 133 can be accurately guided to the channel of the first crossbeam 1113, thereby achieving efficient gas discharge.

[0171] The plug provides an additional seal to prevent gas leakage during the emission process, improving the sealing and reliability of the gas emission path and ensuring that high-temperature gas can be effectively guided to the predetermined emission path.

[0172] In addition, the plug not only helps guide the gas, but also protects the edge of the liquid cooling plate 133 to a certain extent, preventing coolant leakage and ensuring the normal operation of the liquid cooling system.

[0173] In some embodiments, a notch is machined on the side of the first crossbeam 1113 that contacts the liquid cooling plate 133. The gas passage 1334 of the first plug 131 and the second plug 132 is connected to the notch on the first crossbeam 1113. When a battery cell experiences thermal runaway, high-temperature gas is discharged from the first explosion-proof valve 123, passes through the gas passage 1334 on the liquid cooling plate 133, and then passes through the first crossbeam 1113 to the first frame 1111, and then enters the second explosion-proof valve 140 to be discharged from the battery pack 100.

[0174] The battery pack provided in this application embodiment includes a shell with a receiving cavity, the shell including a frame, the frame having a hollow structure; at least two battery modules located within the receiving cavity, the at least two battery modules being spaced apart along the thickness direction of the battery pack, each battery module including multiple cells, each cell having a first explosion-proof valve; a liquid cooling assembly including a liquid cooling plate, the liquid cooling plate having a liquid cooling channel for coolant flow and located between the at least two battery modules, the liquid cooling plate being used for heat exchange with the at least two battery modules; the liquid cooling plate also having a gas channel, the first explosion-proof valves in the at least two battery modules all facing the liquid cooling plate, the gas channel being used to connect the first explosion-proof valves and the frame; and a second explosion-proof valve located on the frame and connected to the frame.

[0175] The liquid-cooled plate, which integrates the gas channel and the liquid cooling channel, can cool the high-temperature gas during the gas discharge process, reducing the severity of thermal runaway and achieving thermoelectric separation. At the same time, by installing a second explosion-proof valve on the frame and designing the frame as a hollow structure connected to the gas channel, when a cell runs away, the high-temperature gas can be discharged to both sides of the frame simultaneously and in a directional manner, improving the exhaust efficiency. In addition, by installing battery modules on the upper and lower sides of a single cold plate, the energy density and integration of the battery pack are improved.

[0176] In addition, embodiments of this application also provide an electronic device, including a battery pack 100.

[0177] It should be noted that the specific structure of the battery pack 100 will not be discussed in detail here; please refer to the above.

[0178] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application 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 application.

[0179] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0180] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A battery pack (100), characterized in that, include: The outer shell (110) has a receiving cavity, and the outer shell (110) includes a frame (111) which is a hollow structure; At least two battery modules (120) are located within the receiving cavity, and the at least two battery modules (120) are spaced apart along the thickness direction of the battery pack (100). Each battery module (120) includes a plurality of battery cells, and each battery cell has a first explosion-proof valve (123). A liquid cooling assembly (130) includes a liquid cooling plate (133) having a liquid cooling channel (1333) for coolant flow and located between at least two of the battery modules (120), the liquid cooling plate (133) being used for heat exchange with at least two of the battery modules (120); The liquid cooling plate (133) also has a gas channel (1334), and the first explosion-proof valves (123) in at least two of the battery modules (120) face the liquid cooling plate (133). The gas channel (1334) is used to connect the first explosion-proof valves (123) and the frame (111). The second explosion-proof valve (140) is disposed on the frame (111) and is connected to the frame (111).

2. The battery pack (100) according to claim 1, characterized in that, Along the width direction of the battery pack (100), the first explosion-proof valve (123) is located in the middle of the battery cell; There are at least two liquid cooling channels (1333) along the width direction of the battery pack (100), and the gas channel (1334) is located in the middle of the liquid cooling plate (133) and between at least two of the liquid cooling channels (1333).

3. The battery pack (100) according to claim 1, characterized in that, The outer casing (110) also includes a bottom protective plate (112), and the battery pack (100) also includes a buffer (150), which is disposed between the bottom protective plate (112) and the battery module (120) facing the bottom protective plate (112).

4. The battery pack (100) according to claim 1, characterized in that, The liquid cooling plate (133) has an adhesive area and an explosion-proof area, and the projection of the gas channel (1334) is located in the explosion-proof area along the thickness direction of the battery pack (100). The battery pack (100) also includes a thermally conductive structural adhesive (160), which is disposed in the bonding area and located between the liquid cooling plate (133) and the battery module (120); The battery pack (100) also includes a baffle strip, which is located on the outer periphery of the explosion-proof area.

5. The battery pack (100) according to any one of claims 1-4, characterized in that, At least two of the battery modules (120) include a first battery unit (121) and a second battery unit (122). The first battery unit (121) includes a plurality of first cells (1211), and the second battery unit (122) includes a plurality of second cells (1221). The first explosion-proof valve (123) includes a first sub-explosion-proof valve (1231) and a second sub-explosion-proof valve (1232). The first sub-explosion-proof valve (1231) is disposed on the first cell (1211), and the second sub-explosion-proof valve (1232) is disposed on the second cell (1221). The first sub-explosion-proof valve (1231) faces the first side of the liquid cooling plate (133), and the second sub-explosion-proof valve (1232) faces the second side of the liquid cooling plate (133).

6. The battery pack (100) according to claim 5, characterized in that, The liquid cooling plate (133) is also provided with a first guide hole (1331) and a second guide hole (1332), both of which are connected to the gas channel (1334). The first guide hole (1331) is located on the first surface of the liquid cooling plate (133) and abuts against the first sub-explosion-proof valve (1231); The second guide hole (1332) is located on the second side of the liquid cooling plate (133) and abuts against the second sub-explosion valve (1232).

7. The battery pack (100) according to claim 6, characterized in that, The outer periphery of the first guide hole (1331) has a first guide protrusion (1335), which surrounds the outer periphery of the first sub-explosion-proof valve (1231). The outer periphery of the second guide hole (1332) has a second guide protrusion (1336), which surrounds the outer periphery of the second sub-explosion valve (1232).

8. The battery pack (100) according to claim 5, characterized in that, The frame (111) includes at least two first borders (1111) and at least two second borders (1112), the at least two first borders (1111) and the at least two second borders (1112) being connected to form the receiving cavity; The frame (111) further includes at least two first crossbeams (1113) and at least two second crossbeams (1114). The at least two first crossbeams (1113) are spaced apart along the length of the battery pack (100) on opposite sides of the first battery cell (121). One end of the first crossbeam (1113) is connected to the gas channel (1334), and the other end of the first crossbeam (1113) is connected to the channel of the first frame (1111). At least two second crossbeams (1114) are spaced apart along the length of the battery pack (100) on opposite sides of the second battery cell (122).

9. The battery pack (100) according to claim 8, characterized in that, The liquid cooling assembly (130) further includes a first plug (131) and a second plug (132), the first plug (131) and the second plug (132) being disposed on opposite sides of the liquid cooling plate (133) along the length direction of the battery pack (100); The first plug (131) is connected between the gas passage (1334) and the passage of the first crossbeam (1113), and the second plug (132) is connected between the gas passage (1334) and the passage of the first crossbeam (1113).

10. An electronic device, characterized in that, Includes the battery pack (100) as described in any one of claims 1 to 9.

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