Round soft package battery cell assembly, battery module and battery pack

Abstract

The utility model belongs to the technical field of batteries, and discloses a round soft package battery cell assembly, a battery module and a battery pack, the round soft package battery cell assembly comprises a battery cell main body and a heat conduction device; a tab connecting piece is arranged on the edge of the battery cell main body, and the tab connecting piece extends by a specified width in a direction far away from the battery cell main body; a hollow accommodating cavity is formed in the heat conduction device, the battery cell main body is positioned in the accommodating cavity, and the tab connecting sheet is propped against the inner wall of the heat conduction device. According to the utility model, the possibility of deformation of the battery cell main body under stress is reduced, and when the battery cell main body is subjected to external pressure, the heat conduction device is beneficial to maintaining the shape and the size of the battery cell main body and preventing internal damage caused by deformation, and meanwhile, the risk that the sealing layer is damaged is reduced, so that the stability of the internal environment of the battery cell main body is maintained; heat can be more uniformly distributed during heat dissipation of the battery cell main body, local overheating is prevented, and the thermal stability of the battery is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and in particular to a round soft-pack battery core assembly, a battery module and a battery pack. Background Art

[0002] Currently existing soft-pack batteries have a certain degree of flexibility in design, which allows them to adapt to different shapes and sizes. However, when the soft-pack battery cell is subjected to external impact or invasion by foreign objects, the battery cell unit lacks all-round protection, and the battery body is prone to deformation. More seriously, the aluminum-plastic film layer may even rupture, causing leakage and short circuit, which will not only affect the performance of the battery cell, but also may cause thermal runaway inside the battery. In addition, the soft-pack battery will generate heat during the charging and discharging process. Due to the limitations of its shape, the current square soft-pack battery cannot achieve 360-degree uniform heat dissipation, which may cause local overheating of the battery pack, thereby affecting the charging and discharging performance of the entire soft-pack battery and shortening the battery life. Utility Model Content

[0003] The main purpose of the present utility model is to provide a circular soft-pack battery cell assembly, a battery module and a battery pack, which solve the technical problem that the existing soft-pack battery cell is easily deformed or even ruptured when subjected to external force or invasion of foreign objects, thereby affecting the performance and safety stability of the entire soft-pack battery, and provide a solution for quickly and efficiently discharging high-temperature and high-pressure ejecta of the battery cell out of the module in the event of thermal runaway.

[0004] In order to achieve the above-mentioned purpose of the utility model, the utility model proposes a circular soft-pack battery core assembly, including a battery core body and a heat conduction device;

[0005] The edge of the battery cell body is provided with a tab connecting piece, and the tab connecting piece extends a specified width in a direction away from the battery cell body;

[0006] A hollow accommodating chamber is provided in the heat conducting device, the battery core body is located in the accommodating chamber, and the tab connecting piece abuts against the inner wall of the heat conducting device.

[0007] Furthermore, the tab connecting piece includes an edge seal, which is located in the middle of the edge of the battery cell body and extends along the entire circumference of the battery cell body.

[0008] Furthermore, the heat conducting device includes a first heat conducting ring and a second heat conducting ring corresponding to the first heat conducting ring, and the first heat conducting ring and the second heat conducting ring are respectively arranged on both sides of the edge sealing.

[0009] Furthermore, the tab connecting sheet further includes a positive tab and a negative tab arranged on the edge seal and opposite to each other, and the positive tab and the negative tab respectively extend away from the edge seal, and the positive tab and the negative tab respectively bend toward the first heat conductive ring and the second heat conductive ring.

[0010] The present utility model also proposes a battery module, comprising the circular soft-pack battery cell assembly described in any one of the above embodiments, and also comprising a shell, wherein there are multiple circular soft-pack battery cell assemblies, multiple circular soft-pack battery cell assemblies are stacked in the shell, and a heat insulation buffer device is provided between adjacent circular soft-pack battery cell assemblies.

[0011] Furthermore, a liquid cooling exhaust portion is formed between the inner wall and the outer wall of the shell, and a plurality of liquid cooling channels arranged at intervals are provided in the liquid cooling exhaust portion.

[0012] Furthermore, a plurality of exhaust channels are provided in the liquid-cooling exhaust portion, and the exhaust channels are located between adjacent liquid-cooling channels.

[0013] Furthermore, a plurality of exhaust grooves corresponding to the exhaust channel are provided on the inner wall of the shell, and the exhaust grooves are communicated with the exhaust channel.

[0014] Furthermore, a packaging film corresponding to the exhaust groove is provided on the inner wall of the shell, and the packaging film is attached to the opening of the exhaust groove for packaging the exhaust groove.

[0015] Furthermore, the battery module also includes an end cover, which includes a covering portion and a connecting portion, the covering portion is arranged at the end of the shell, the connecting portion is arranged at an end of the covering portion away from the shell, and the connecting portion is connected to the covering portion.

[0016] Furthermore, a plurality of exhaust ports are provided on the side of the communicating portion, the exhaust ports are communicated with the exhaust channel, and the plurality of exhaust ports are spaced apart along the entire circumference of the side of the communicating portion.

[0017] Furthermore, a liquid cooling port is provided at the top end of the communication portion, the liquid cooling port extends toward the covering portion, and the liquid cooling port is communicated with the liquid cooling channel.

[0018] Furthermore, a connecting groove is provided at one end of the covering portion close to the shell, the connecting groove corresponds to the liquid-cooled exhaust portion, and a docking port for connecting the liquid-cooled exhaust portion and the connecting portion is provided at the bottom of the connecting groove.

[0019] The present invention also provides a battery pack, comprising any one of the battery modules described above.

[0020] Beneficial effects:

[0021] The utility model discloses a circular soft-pack battery cell assembly, comprising a battery cell body and a heat-conducting device; the edge of the battery cell body is provided with a tab connecting piece, and the tab connecting piece extends a specified width in a direction away from the battery cell body; a hollow accommodating chamber is provided in the heat-conducting device, the battery cell body is located in the accommodating chamber, and the tab connecting piece abuts against the inner wall of the heat-conducting device. Therefore, by placing the battery cell body in the accommodating chamber of the heat-conducting device, the heat-conducting device provides a solid shell for the battery cell body, reducing the possibility of deformation of the battery cell body when subjected to force, and when subjected to external pressure, the heat-conducting device helps to maintain the shape and size of the battery cell body, preventing internal damage caused by deformation. At the same time, by reducing the deformation of the battery cell body, the risk of damage to the sealing layer can be reduced, thereby maintaining the stability of the internal environment of the battery cell body; and annular exhaust grooves are evenly distributed around the battery cell inside the shell to ensure that high-temperature and high-pressure ejecta can be discharged out of the module shell in a timely, stable and directional manner when the battery cell thermal runaway occurs, thereby reducing the probability of heat spread in the battery module due to thermal runaway of the battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the overall structure of a circular soft-pack battery cell assembly according to an embodiment of the present invention;

[0023] Figure 2 This is a schematic diagram of the overall structure of the battery cell body according to one embodiment of the present utility model;

[0024] Figure 3 This is a schematic diagram of the overall structure of a battery module according to an embodiment of the present invention;

[0025] Figure 4 This is a schematic diagram of the overall structure of the housing according to an embodiment of the present invention;

[0026] Figure 5 This is a front side view of an end cap according to another embodiment of the present invention;

[0027] Figure 6 This is a rear side view of an end cover according to another embodiment of the present invention.

[0028] in:

[0029] 1. Battery cell body; 2. Heat conducting device; 3. Tab connector; 4. Accommodating chamber; 5. Shell; 6. Thermal insulation buffer device; 7. End cover; 8. Battery cell stack;

[0030] 20. First heat-conducting ring; 21. Second heat-conducting ring;

[0031] 30. Edge sealing; 31. Positive electrode ear; 32. Negative electrode ear;

[0032] 50. Liquid cooling exhaust portion; 51. Liquid cooling channel; 52. Exhaust channel; 53. Exhaust slot;

[0033] 70. Covering part; 71. Connecting part; 72. Exhaust port; 73. Liquid cooling port; 74. Connecting groove; 75. Docking port; 76. Front cover; 77. Rear cover.

[0034] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0035] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0036] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like, indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operate in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0037] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to mechanical connections, direct connections, or indirect connections through an intermediate medium; they may refer to internal communication between two components or the interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0038] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0039] Reference Figure 1 , this embodiment provides a circular soft-pack battery cell assembly, including a battery cell body 1 and a heat conducting device 2;

[0040] The edge of the battery cell body 1 is provided with a tab connection piece 3, and the tab connection piece 3 extends away from the battery cell body 1 by a specified width;

[0041] A hollow accommodating chamber 4 is provided in the heat conducting device 2 , the battery cell body 1 is located in the accommodating chamber 4 , and the tab connecting piece 3 abuts against the inner wall of the heat conducting device 2 .

[0042] In the above embodiment, the circular soft-pack battery cell assembly includes a battery cell body 1 and a heat-conducting device 2, wherein the battery cell body 1 is composed of an aluminum-plastic film, a positive electrode sheet, a diaphragm, a negative electrode sheet, and an electrolyte, and the positive electrode sheet, the negative electrode sheet, the diaphragm and the electrolyte are wrapped inside by an aluminum-plastic film (not shown in the figure), so that a tab connecting piece 3 is provided at the edge of the aluminum-plastic film shell 5 of the battery cell body 1, and the tab connecting piece 3 extends a certain distance in the direction away from the battery cell body 1, so that the edge of the tab connecting piece 3 and the edge of the battery cell body 1 form a specified width, and in addition, a hollow accommodating chamber 4 with two ends open is provided in the heat-conducting device 2, when the heat-conducting device 2 is placed on the tab connecting piece 3, the battery cell body 1 is sleeved in the accommodating chamber 4, the tab connecting piece 3 abuts against the inner wall of the heat-conducting device 2, and the material of the heat-conducting device 2 includes but is not limited to aluminum. , copper, aluminum alloy or graphene and other materials with good thermal conductivity, so that the heat-conducting device 2 in the round soft-pack battery cell assembly simultaneously assumes the dual functions of structural protection and heat conduction, so that the battery cell body 1 can be placed in the accommodating chamber 4 of the heat-conducting device 2, so that the heat-conducting device 2 provides a solid side shell for the battery cell body 1, reducing the possibility of side deformation of the battery cell body 1 when subjected to force, and when subjected to external pressure, the heat-conducting device 2 helps to maintain the shape and size of the battery cell body 1, and prevents internal damage caused by deformation. At the same time, by reducing the deformation of the battery cell body 1, the risk of damage to the sealing layer of the battery cell body 1 can be reduced, thereby maintaining the stability of the internal environment of the battery cell body 1, and helping the battery cell body 1 to distribute heat more evenly when dissipating heat, preventing local overheating, and improving the thermal stability of the battery.

[0043] Reference Figure 1-Figure 2 In one embodiment, the tab connecting piece 3 includes a sealing edge 30 , which is located in the middle of the edge of the battery cell body 1 and extends along the entire circumference of the battery cell body 1 .

[0044] In the above embodiment, the tab connecting piece 3 includes a sealing edge 30, wherein the sealing edge 30 is connected to the battery cell body 1 and is formed by extending a specified width in a direction away from the battery cell body 1, and the sealing edge 30 also extends along the entire circumference of the battery cell body 1, so that the sealing edge 30 forms a continuous sealing edge structure at the edge of the side of the battery cell body 1, which is used to ensure the sealing of the battery cell body 1, and the heat conducting device 2 is placed on the sealing edge 30 to protect the sealing edge 30 from damage.

[0045] Furthermore, the heat conducting device 2 includes a first heat conducting ring 20 and a second heat conducting ring 21, wherein the first heat conducting ring 20 and the second heat conducting ring 21 are arranged corresponding to each other and have the same size, and the edge sealing 30 is preferably arranged in the middle position of the edge of the battery core body 1, so that the first heat conducting ring 20 and the second heat conducting ring 21 are symmetrically arranged on both sides of the edge sealing 30, and at the same time, the thickness between the inner wall and the outer wall of the first heat conducting ring 20 and the second heat conducting ring 21 is greater than the specified width of the edge sealing 30, that is, the diameter of the first heat conducting ring 20 and the second heat conducting ring 21 is greater than the edge sealing 30. 0 diameter ensures more stable contact between the first thermally conductive ring 20 and the second thermally conductive ring 21 and the edge seal 30, reduces the possibility of sliding or shifting of the first thermally conductive ring 20 and the second thermally conductive ring 21, and ensures that the edge seal 30 can be well protected to prevent it from being deformed by force and affecting its sealing. In addition, the symmetrical design of the first thermally conductive ring 20 and the second thermally conductive ring 21 helps to maintain the balance of the battery body 1 in the heat-conducting device 2, reduces stress concentration caused by asymmetry, and improves the performance and reliability of the entire circular soft-pack battery cell assembly.

[0046] Reference Figure 1-Figure 2 In one embodiment, the tab connecting sheet 3 further includes a positive tab 31 and a negative tab 32 that are arranged on the edge seal 30 and are opposite to each other, and the positive tab 31 and the negative tab 32 respectively extend in a direction away from the edge seal 30, and the positive tab 31 and the negative tab 32 are respectively bent toward the first heat-conducting ring 20 and the second heat-conducting ring 21.

[0047] In the above embodiment, the tab connector 3 further includes a positive tab 31 and a negative tab 32, wherein the positive tab 31 and the negative tab 32 are respectively arranged at the edge of the edge seal 30 away from the end of the battery cell body 1, and the positive tab 31 and the negative tab 32 are located at the two ends of the same diameter so that the two are arranged relative to each other. In addition, the positive tab 31 and the negative tab 32 respectively extend a certain distance away from the edge seal 30, so that when the first thermal conductive ring 20 and the second thermal conductive ring 21 are placed on the edge seal 30, the positive tab 31 and the negative tab 32 respectively protrude from the intersection of the first thermal conductive ring 20 and the second thermal conductive ring 21, and the positive tab 31 is bent toward the first thermal conductive ring 20, and the negative tab 32 is bent toward the first thermal conductive ring 20. The ear 32 is bent toward the second thermally conductive ring 21, and the bending angles of the positive ear 31 and the negative ear 32 are preferably vertical, so that the positive ear 31 and the negative ear 32 are respectively maintained in a perpendicular state to the edge sealing 30, so that the positive ear 31 and the negative ear 32 can be more closely fitted with the first thermally conductive ring 20 and the second thermally conductive ring 21 or other contact components, thereby improving the stability and reliability of the electrical contact between the positive ear 31 and the negative ear 32, and the vertically bent positive ear 31 and the negative ear 32 can reduce the side space requirement of the circular soft-pack battery cell assembly, so that the entire circular soft-pack battery cell assembly can be arranged more compactly, thereby improving the space utilization of the circular soft-pack battery cell assembly.

[0048] Reference Figure 3 This embodiment provides a battery module, including the circular soft-pack battery cell assembly described in any one of the above embodiments, and also includes a shell 5, there are multiple circular soft-pack battery cell assemblies, multiple circular soft-pack battery cell assemblies are stacked in the shell 5, and a heat insulation buffer device 6 is provided between adjacent circular soft-pack battery cell assemblies.

[0049] In the above embodiment, the battery module includes a circular soft-pack battery cell assembly and a shell 5, wherein there are multiple circular soft-pack battery cell assemblies, and the multiple circular soft-pack battery cell assemblies have the same size. In addition, the material of the shell 5 is preferably aluminum alloy, and a cavity with two ends open and hollow is provided in the shell 5. The multiple circular soft-pack battery cell assemblies are welded to each other through the positive ear 31 and the negative ear 32 to form a battery cell stack 8 connected in series. The stacked circular soft-pack battery cell assembly is placed in the cavity of the shell 5. Therefore, the shell 5 provides better thermal conductivity and structural strength for the stacking of the multiple circular soft-pack battery cell assemblies, effectively preventing the multiple circular soft-pack battery cell assemblies from being subjected to additional damage; in addition, in adjacent circular A thermal insulation buffer device 6 is provided between the circular soft-pack battery cell assemblies. The thermal insulation buffer device 6 is preferably foam, and the diameter of the thermal insulation buffer device 6 is less than or equal to the outer wall diameter of the heat conducting device 2 in the circular soft-pack battery cell assembly, and greater than or equal to the inner wall diameter of the heat conducting device 2 in the circular soft-pack battery cell assembly, ensuring that the thermal insulation buffer device 6 completely covers the large surface of the battery cell body 1 in the circular soft-pack battery cell assembly, effectively blocking the heat transfer between the circular soft-pack battery cell assemblies, reducing the risk of local overheating, and reducing safety problems caused by thermal runaway. At the same time, it can effectively absorb and disperse the impact and expansion of the circular soft-pack battery cell assembly during transportation or use, thereby improving the safety of the entire battery module.

[0050] Reference Figure 4 In one embodiment, a liquid cooling exhaust portion 50 is formed between the inner wall and the outer wall of the shell 5 , and a plurality of liquid cooling channels 51 arranged at intervals are provided in the liquid cooling exhaust portion 50 .

[0051] In the above embodiment, a specified thickness is formed between the inner wall and the outer wall of the shell 5, so that the shell 5 forms a liquid-cooled exhaust portion 50 at the specified thickness between the inner wall and the outer wall, and a plurality of liquid-cooled channels 51 are provided in the liquid-cooled exhaust portion 50 for the circulation of the cooling liquid. When the circular soft-pack battery cell assembly is circular, the shell 5 is cylindrical, and the plurality of liquid-cooled channels 51 are evenly spaced along the entire circumference of the shell 5 on the liquid-cooled exhaust portion 50, so that the liquid-cooled channels 51 are preferably a runway-shaped structure with a certain curvature. When the battery module is in use, the heat generated by the circular soft-pack battery cell assembly can be evenly transferred to the liquid through the heat-conducting device 2 within a 360-degree range of the circular soft-pack battery cell assembly. The cold channel 51 effectively improves the heat dissipation effect of the circular soft-pack battery cell assembly, and the liquid cooling channel 51 extends along the entire length direction of the shell 5, so that the liquid cooling channel 51 is in an open state at both ends of the shell 5 to form a non-closed continuous flow channel, thereby improving the structural strength of the entire shell 5 while fully improving the space utilization of the shell 5. The liquid cooling channel 51 forms a non-closed continuous flow channel, so that the coolant can flow continuously, improving the cooling efficiency, reducing the thermal stress of the circular soft-pack battery cell assembly caused by temperature changes, extending the service life of the entire battery module, and helping to prevent the circular soft-pack battery cell assembly from overheating, reducing the risk of thermal runaway, and improving the safety of the battery module.

[0052] Reference Figure 4 In one embodiment, a plurality of exhaust channels 52 are further provided in the liquid cooling exhaust portion 50 , and the exhaust channels 52 are located between adjacent liquid cooling channels 51 .

[0053] In the above embodiment, a plurality of exhaust channels 52 are further provided in the liquid-cooled exhaust portion 50 for discharging high-temperature and high-pressure ejecta during thermal runaway of a plurality of circular soft-pack battery core assemblies. The plurality of exhaust channels 52 are provided between adjacent liquid-cooled channels 51, and a specified interval is formed between the exhaust channels 52 and the liquid-cooled channels 51, so that the exhaust channels 52 and the liquid-cooled channels 51 are in a non-connected state. At the same time, the plurality of exhaust channels 52 are also evenly spaced along the entire circumference of the shell 5 on the liquid-cooled exhaust portion 50, and the exhaust channels 52 are preferably a runway-shaped structure with a certain curvature, and the exhaust channels 52 are arranged along the entire circumference of the shell 5. The exhaust channel 52 extends in the length direction so that the exhaust channel 52 is in an open state at both ends of the shell 5 to form a non-closed continuous flow channel, wherein the curvature of the exhaust channel 52 is less than or equal to the curvature of the liquid cooling channel 51. Therefore, the exhaust channel 52 provides a safe discharge path for high-temperature and high-pressure ejecta. By guiding the ejecta to the exhaust channel 52, secondary damage to other parts of the battery module can be reduced. The design of the spacing between the exhaust channel 52 and the liquid cooling channel 51 avoids the mixing of the coolant and the ejecta, ensuring the normal operation and efficiency of the cooling system, while optimizing the space utilization of the shell 5 and making the liquid cooling exhaust portion 50 more compact.

[0054] Reference Figure 4 In one embodiment, a plurality of exhaust grooves 53 corresponding to the exhaust channel 52 are provided on the inner wall of the shell 5 , and the exhaust grooves 53 are communicated with the exhaust channel 52 .

[0055] In the above embodiment, a plurality of exhaust grooves 53 are provided on the inner wall of the shell 5, and the exhaust grooves 53 are provided corresponding to the exhaust channels 52 in the liquid-cooled exhaust portion 50, and when the exhaust grooves 53 extend along the length direction of the inner wall of the shell 5, there is a certain distance between the ends of the exhaust grooves 53 and the ends of the shell 5, so that the length of the exhaust grooves 53 is smaller than the length of the exhaust channels 52, ensuring that when the exhaust grooves 53 are connected to the exhaust channels 52 for exhaust, the ejecta of the circular soft-pack battery cell assembly is prevented from leaking at the ends of the shell 5, which helps to provide a direct discharge path for the high-temperature and high-pressure ejecta generated by the circular soft-pack battery cell assembly in the case of thermal runaway through the exhaust grooves 53, helps to quickly reduce the internal pressure of the battery module, and improves the exhaust efficiency.

[0056] Furthermore, a packaging film is provided on the inner wall of the shell 5, and the packaging film is preferably a PC (Polycarbonate Sheet) film, and the packaging film corresponds to the exhaust groove 53, so that the packaging film is attached to the opening of the exhaust groove 53 to encapsulate the exhaust groove 53, ensuring that when the circular soft-pack battery cell assembly does not have thermal runaway, the circular soft-pack battery cell assembly and the exhaust channel 52 are in a non-connected state. In addition, the packaging film can also cover the entire inner wall of the shell 5 as a whole, effectively sealing the exhaust groove 53, ensuring that under normal operating conditions, the circular soft-pack battery cell assembly and the exhaust channel 52 will not be connected, preventing external pollutants or moisture from entering the circular soft-pack battery cell assembly, providing an additional physical protection layer, and can resist tiny particles, dust or other foreign substances that may damage the circular soft-pack battery cell assembly.

[0057] Reference Figure 3-Figure 5 In one embodiment, the battery module further includes an end cover 7, which includes a covering portion 70 and a connecting portion 71, wherein the covering portion 70 is arranged at the end of the shell 5, and the connecting portion 71 is arranged at an end of the covering portion 70 away from the shell 5, and the connecting portion 71 is connected to the covering portion 70.

[0058] In the above embodiment, the battery module further includes an end cover 7, wherein the end cover 7 is two and is respectively arranged at the front end and the rear end of the shell 5, so that the end cover 7 includes a front end cover 76 and a rear end cover 77, and the end cover 7 includes a covering portion 70 and a connecting portion 71, the covering portion 70 corresponds to the end of the shell 5, so that the covering portion 70 is detachably arranged at the end of the shell 5, and the connecting portion 71 is arranged at one end of the covering portion 70 away from the shell 5, and the covering portion 70 protrudes a certain height in the direction away from the shell 5, and the connecting portion 71 is preferably arranged The middle position of the cover part 70, and the connecting part 71 is connected to the cover part 70, so that when the cover part 70 is set on the end of the shell 5, the connecting part 71 is connected to the liquid cooling channel 51 and the exhaust channel 52 on the liquid cooling exhaust part 50. The connecting part 71 at the center position helps to distribute the coolant more evenly in the liquid cooling channel 51, avoiding the problem of uneven cooling, and in the case of thermal runaway, the connecting part 71 at the center position can quickly and effectively discharge the high-temperature and high-pressure gas, reducing damage to the circular soft-pack battery cell assembly.

[0059] Reference Figure 3-Figure 5 In one embodiment, a plurality of exhaust ports 72 are provided on the side of the connecting portion 71 , the exhaust ports 72 are connected to the exhaust channel 52 , and the plurality of exhaust ports 72 are spaced apart along the entire circumference of the side of the connecting portion 71 .

[0060] In the above embodiment, a plurality of exhaust ports 72 are provided on the side of the connecting portion 71, wherein the exhaust ports 72 are connected to the exhaust channel 52 and are used to discharge the ejecta in the exhaust channel 52 to the outside through the exhaust ports 72. The exhaust ports 72 extend along the entire height direction of the side of the connecting portion 71. At the same time, the plurality of exhaust ports 72 are evenly spaced along the entire circumference direction of the side of the connecting portion 71, so that the plurality of exhaust ports 72 form an annular structure on the connecting portion 71, effectively increasing the exhaust area and improving the discharge efficiency of the ejecta in the exhaust channel 52. In addition, in the event of thermal runaway or other emergency, the annular exhaust ports 72 can quickly release high-temperature and high-pressure gas to reduce the risk of explosion or fire. In addition, an explosion-proof valve and a filter device are also provided in the exhaust port 72. The explosion-proof valve can open in time when the internal pressure exceeds the safety threshold to release the pressure and avoid battery explosion due to pressure accumulation. The filter device can absorb toxic substances generated by thermal runaway of the circular soft-pack battery cell assembly to reduce the harm of toxic gases to the human body when the circular soft-pack battery cell assembly experiences thermal runaway.

[0061] Furthermore, a liquid cooling port 73 is provided at the top of the connecting portion 71, and the liquid cooling port 73 extends toward the covering portion 70, so that the liquid cooling port 73 is connected to the liquid cooling channel 51. The liquid cooling port 73 is preferably provided in the middle of the connecting portion 71, and the coolant is concentratedly introduced into the end cover 7 of another battery module or the main inlet and outlet, which helps to achieve uniform flow and distribution of the coolant and improve cooling efficiency.

[0062] Reference Figure 3-Figure 6 In one embodiment, a connecting groove 74 is provided at one end of the covering portion 70 close to the shell 5, and the connecting groove 74 corresponds to the liquid-cooled exhaust portion 50, and a docking port 75 for connecting the liquid-cooled exhaust portion 50 and the connecting portion 71 is provided at the bottom of the connecting groove 74.

[0063] In the above embodiment, a connecting groove 74 is provided at one end of the covering portion 70 close to the shell 5, wherein the connecting groove 74 corresponds to the liquid-cooled exhaust portion 50, and the width of the connecting groove 74 is greater than or equal to the thickness of the liquid-cooled exhaust portion 50, so that the covering portion 70 is connected to the shell 5 through the connecting groove 74. In addition, a docking port 75 is provided at the bottom of the connecting groove 74, and the docking port 75 is used to connect the liquid-cooled exhaust portion 50 with the connecting portion 71, wherein the docking port 75 includes a plurality of liquid-cooled docking ports 75 corresponding to the liquid-cooling channel 51, which is used to connect the liquid-cooling channel 51 and the liquid-cooling port 73, and the docking port 75 also includes a plurality of exhaust docking ports 75 corresponding to the exhaust channel 52, which is used to connect the exhaust channel 52 and the exhaust port 72, ensuring that the liquid-cooling channel 51 and the exhaust channel 52 are accurately connected with the corresponding liquid-cooling port 73 and the exhaust port 72, thereby improving the cooling and exhaust efficiency.

[0064] This embodiment provides a battery pack, comprising the battery module described in any one of the above embodiments.

[0065] In the above embodiment, the battery pack includes a plurality of battery modules. By connecting the plurality of battery modules end to end to form a battery pack, the requirements of different voltage working platforms and power levels can be met, and a diversified form combination can be achieved to adapt to different working environments and requirements.

[0066] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the description and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A round soft-pack battery core assembly, characterized in that: Including a battery cell body and a heat conducting device; The edge of the battery cell body is provided with a tab connecting piece, and the tab connecting piece extends a specified width in a direction away from the battery cell body; A hollow accommodating chamber is provided in the heat conducting device, the battery cell body is located in the accommodating chamber, and the tab connecting piece abuts against the inner wall of the heat conducting device.

2. The round soft-pack battery core assembly according to claim 1, characterized in that: The tab connecting piece includes a sealing edge, which is located in the middle of the edge of the battery cell body and extends along the entire circumference of the battery cell body.

3. The round soft-pack battery core assembly according to claim 2, characterized in that: The heat conducting device includes a first heat conducting ring and a second heat conducting ring corresponding to the first heat conducting ring, and the first heat conducting ring and the second heat conducting ring are respectively arranged on both sides of the edge sealing.

4. The round soft-pack battery core assembly according to claim 3, characterized in that: The tab connecting sheet further includes a positive tab and a negative tab that are arranged on the edge seal and are opposite to each other, and the positive tab and the negative tab respectively extend away from the edge seal, and the positive tab and the negative tab respectively bend toward the first heat conductive ring and the second heat conductive ring.

5. A battery module, characterized in that: It includes the circular soft-pack battery cell assembly according to any one of claims 1 to 4, and also includes a shell, wherein there are multiple circular soft-pack battery cell assemblies, multiple circular soft-pack battery cell assemblies are stacked in the shell, and a heat insulation buffer device is provided between adjacent circular soft-pack battery cell assemblies.

6. The battery module according to claim 5, characterized in that: A liquid cooling exhaust portion is formed between the inner wall and the outer wall of the shell, and a plurality of liquid cooling channels arranged at intervals are arranged in the liquid cooling exhaust portion.

7. The battery module according to claim 6, characterized in that: A plurality of exhaust channels are further provided in the liquid cooling exhaust portion, and the exhaust channels are located between adjacent liquid cooling channels.

8. The battery module according to claim 7, characterized in that: A plurality of exhaust grooves corresponding to the exhaust passages are provided on the inner wall of the shell, and the exhaust grooves are communicated with the exhaust passages.

9. The battery module according to claim 8, characterized in that: A packaging film corresponding to the exhaust groove is further provided on the inner wall of the shell, and the packaging film is attached to the opening of the exhaust groove for packaging the exhaust groove.

10. The battery module according to claim 7, characterized in that: The battery module further includes an end cover, which includes a covering portion and a connecting portion. The covering portion is arranged at the end of the shell, and the connecting portion is arranged at an end of the covering portion away from the shell, and the connecting portion is connected to the covering portion.

11. The battery module according to claim 10, characterized in that: A plurality of exhaust ports are provided on the side of the communicating portion, the exhaust ports are communicated with the exhaust channel, and the plurality of exhaust ports are spaced apart along the entire circumference of the side of the communicating portion.

12. The battery module according to claim 10, characterized in that: The communication portion is provided with a liquid cooling port, the liquid cooling port extends toward the covering portion, and the liquid cooling port is communicated with the liquid cooling channel.

13. The battery module according to claim 10, characterized in that: A connecting groove is provided at one end of the covering portion close to the shell, the connecting groove corresponds to the liquid cooling exhaust portion, and a docking port for connecting the liquid cooling exhaust portion and the connecting portion is provided at the bottom of the connecting groove.

14. A battery pack, characterized in that: A battery module comprising any one of claims 5 to 13.

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