Battery device and electric device
By setting a gap or separation structure in the battery device, the contact between the battery cell and the current collector is avoided, and the cooling liquid leakage problem caused by thermal runaway of the battery cell is solved, and the safety performance and capacity of the battery device are improved.
Patent Information
- Application Number
- CN202422363960.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-27
- Publication Date
- 2024-12-13
- Estimated Expiration
- 2034-09-27
AI Technical Summary
During the charging and discharging process of the battery device, the battery cell is prone to contact with the current collector of the heat exchange assembly when it is thermally out of control, resulting in damage to the current collector and leakage of coolant, which poses a major safety hazard.
By setting a gap between the battery cell assembly and the current collector, the gap width is greater than 2 mm or a separation structure is provided, contact between the battery cell and the current collector is prevented, thereby preventing damage to the current collector and leakage of coolant.
It effectively avoids contact between the battery cell and the current collector, improves the safety performance of the battery device, and reduces the risk of coolant leakage. The appropriate gap width range is 2mm~20mm to ensure safety and miniaturization.
Smart Images
Figure CN222168524U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of batteries, in particular to a battery device and an electric device. Background Art
[0002] In the related art, during the charging and discharging process of a battery device, the battery cells of the battery device will generate a large amount of heat, causing the temperature of the battery device to rise. The battery device usually has a heat exchange component that is thermally connected to the battery cells to adjust the operating temperature of the battery device and ensure that the battery device operates in the best condition, thereby improving the performance and service life of the battery device.
[0003] However, when a battery cell of a battery device experiences thermal runaway, the battery cell expands and deforms, which can easily cause contact with the current collector of the heat exchange assembly, resulting in damage to the current collector and coolant leakage, which can easily lead to safety accidents and pose a major safety hazard. Utility Model Content
[0004] In view of the above problems, the utility model provides a battery device and an electrical device, which can prevent the battery cells from contacting the current collector when thermal runaway occurs in the battery cells of the battery device, so as to avoid damage to the current collector, thereby avoiding leakage of coolant in the current collector and causing safety accidents, which is beneficial to improving the safety performance of the battery device.
[0005] In a first aspect, the utility model provides a battery device, comprising: a box body having a accommodating cavity; a battery cell assembly, arranged in the accommodating cavity and comprising a plurality of battery cells; a heat exchange assembly, arranged in the accommodating cavity and comprising a connected current collecting piece and a heat exchange unit, the heat exchange unit having a heat exchange flow channel, the current collecting piece having a current collecting cavity connected to the heat exchange flow channel, the heat exchange unit being thermally connected to the battery cell, the current collecting piece being located on at least one side of the battery cell assembly along a first direction; wherein, in the first direction, the current collecting piece is spaced apart from the battery cell assembly so that there is a gap between the current collecting piece and the battery cell assembly, the width of the gap in the first direction is greater than 2 mm and / or a partition structure is provided in the gap.
[0006] In the above technical solution, by making the width dimension of the gap between the current collector and the battery cell assembly in the first direction greater than 2 mm, when the battery cell of the battery device undergoes thermal runaway, the expansion amount of the battery cell will not be greater than the width dimension of the gap in the first direction, thereby avoiding contact between the battery cell and the current collector to avoid damage to the current collector, thereby avoiding leakage of coolant in the current collector to cause safety accidents, which is beneficial to improving the safety performance of the battery device; or by providing a partition structure in the gap, when the battery cell of the battery device undergoes thermal runaway, the partition structure can effectively separate the battery cell from the current collector, and also avoid contact between the battery cell and the current collector to avoid damage to the current collector, thereby avoiding leakage of coolant in the current collector to cause safety accidents, which is beneficial to improving the safety performance of the battery device.
[0007] In some embodiments, the width of the gap in the first direction ranges from 2 mm to 20 mm.
[0008] In the above technical scheme, if the width dimension of the gap in the first direction is less than 2 mm, the width dimension of the gap is too small, and the contact between the battery cell and the current collector cannot be effectively avoided when the battery cell of the battery device has thermal runaway; if the width dimension of the gap in the first direction is greater than 20 mm, the width dimension of the gap is too large, and it will occupy a larger space in the box, which is not conducive to increasing the battery capacity of the battery device and miniaturization of the battery device; by making the width dimension of the gap in the first direction range from 2 mm to 20 mm, the width dimension of the gap in the first direction is appropriate, which can effectively avoid the contact between the battery cell and the current collector when the battery cell of the battery device has thermal runaway, thereby avoiding the safety accident caused by the leakage of coolant, and the gap will not occupy too much space in the box, which is conducive to increasing the battery capacity of the battery device and miniaturization of the battery device.
[0009] In some embodiments, the width of the gap in the first direction ranges from 8 mm to 15 mm.
[0010] In the above technical solution, if the width dimension of the gap in the first direction is less than 8 mm, the width dimension of the gap is relatively small, and there is still a safety hazard of coolant leakage when the battery cell of the battery device has thermal runaway; if the width dimension of the gap in the first direction is greater than 15 mm, the width dimension of the gap is relatively large, which will occupy a larger space in the box, which is not conducive to increasing the battery capacity of the battery device and miniaturization of the battery device; by making the width dimension of the gap in the first direction range from 8 mm to 15 mm, the width dimension of the gap in the first direction is appropriate, and the safety hazard of coolant leakage can be effectively reduced when the battery cell of the battery device has thermal runaway, thereby avoiding safety accidents caused by coolant leakage, and the gap will not occupy too much space in the box, which is conducive to increasing the battery capacity of the battery device and miniaturization of the battery device.
[0011] In some embodiments, a width dimension of the gap in the first direction is greater than A, where A is a maximum expansion amount of the battery cell in the first direction when thermal runaway occurs.
[0012] In the above technical solution, by making the width dimension of the gap in the first direction larger than the maximum expansion amount of the battery cell in the first direction when thermal runaway occurs, the width dimension of the gap can effectively prevent the expanded battery cell from contacting the current collector, thereby effectively preventing the current collector from being damaged and the leakage of the coolant in the current collector, thereby reducing the safety hazard of the battery device.
[0013] In some embodiments, the partition structure is a heat insulating structure or a high temperature resistant structure.
[0014] In the above technical scheme, by making the partition structure a heat-insulating structure, when the battery cell has thermal runaway, the heat-insulating structure can provide protection for the current collector, effectively blocking the heat on the battery cell from being transferred to the current collector, thus preventing the battery cell from causing damage to the current collector and the resulting leakage of the coolant; by making the partition structure a high-temperature resistant structure, under the high-temperature state of the battery cell having thermal runaway, the high-temperature resistant structure can effectively protect the current collector, thus preventing the battery cell from causing damage to the current collector and the resulting leakage of the coolant.
[0015] In some embodiments, the partition structure is made of insulation cotton or foam plastic or nylon.
[0016] In the above technical scheme, the partition structure is made of thermal insulation cotton, which has good thermal insulation performance. When the battery cell has thermal runaway, the thermal insulation cotton is arranged in the gap to effectively block the heat on the battery cell from being transferred to the current collector; the partition structure is made of foam plastic, which has good thermal insulation performance. When the battery cell has thermal runaway, the thermal insulation cotton is arranged in the gap to effectively block the heat on the battery cell from being transferred to the current collector; the partition structure is made of nylon, which has good high temperature resistance. When the battery cell has thermal runaway, the current collector can be effectively protected from damage.
[0017] In some embodiments, the separator structure is fixed to the battery cell assembly.
[0018] In the above technical solution, by fixing the partition structure to the battery cell assembly, it is beneficial to improve the installation stability and reliability of the partition structure.
[0019] In some embodiments, the separation structure is bonded to a side of the battery cell assembly facing the gap.
[0020] In the above technical solution, by bonding the partition structure to the side of the battery cell assembly facing the gap, the bonding method is simple to operate and the connection is stable, which is conducive to improving the production efficiency of the battery device.
[0021] In some embodiments, the partition structure is fixed to the current collecting member.
[0022] In the above technical solution, by fixing the partition structure to the current collecting member, it is beneficial to improve the installation stability and reliability of the partition structure.
[0023] In some embodiments, the partition structure is bonded to the current collecting member or the partition structure and the current collecting member are integrally formed.
[0024] In the above technical solution, by bonding the partition structure to the current collecting part, the bonding method is simple to operate and the connection is stable, which is beneficial to improving the production efficiency of the battery device; by forming the partition structure and the current collecting part as one piece, the installation operation of the partition structure can be omitted, and the partition structure and the current collecting part can be modularly installed, which is beneficial to improving the production and assembly efficiency of the battery device.
[0025] In some embodiments, the current collecting member is coated with a protective layer, and the portion of the protective layer located in the gap constitutes the separation structure.
[0026] In the above technical solution, the protective layer wrapped around the current collector forms a comprehensive protection for the current collector. By making the part of the protective layer located in the gap constitute a partition structure, there is no need to set up a separate partition structure. The protective layer as a partition structure can effectively prevent the battery cell from causing damage to the current collector and leakage of coolant when thermal runaway occurs, which is beneficial to reducing the safety risks of the battery device and improving its safety performance.
[0027] In some embodiments, the protective layer is a protective sleeve, and a heat-insulating space is provided inside the protective sleeve or a heat-insulating space is defined between the protective sleeve and the current collecting member.
[0028] In the above technical solution, by providing a heat-insulating space inside the protective sleeve or defining a heat-insulating space between the protective sleeve and the current collector, when thermal runaway occurs in the battery cell, the heat-insulating space can effectively block the heat on the battery cell from being transferred to the current collector, thereby avoiding damage to the current collector due to high temperature and leakage of the coolant in the current collector, thereby helping to improve the safety performance of the battery device.
[0029] In some embodiments, the protective sleeve includes an outer tube layer, an inner tube layer and a plurality of connecting ribs. The inner tube layer is sleeved on the outside of the current collecting part, the outer tube layer is located on the outer peripheral side of the inner tube layer and is spaced apart from the inner tube layer, the outer tube layer and the inner tube layer define the insulation space, a plurality of connecting ribs are located between the outer tube layer and the inner tube layer and are arranged at intervals along the circumference of the inner tube layer, and the two ends of each connecting rib are respectively connected to the inner tube layer and the outer tube layer.
[0030] In the above technical solution, the structural strength and structural stability of the protective sleeve are relatively high, which is beneficial to improving the protective effect of the protective sleeve on the current collecting member.
[0031] In some embodiments, the plurality of battery cells are divided into a plurality of battery cell rows arranged along a second direction, each of the battery cell rows includes one or more battery cells arranged along the first direction, the second direction intersects with the first direction, the heat exchange unit is arranged as a plurality of cells arranged at intervals along the second direction, the heat exchange unit is provided between two adjacent battery cell rows, the current collecting members are provided as two, the two current collecting members are located on both sides of the battery cell assembly along the first direction, one of the current collecting members has a liquid inlet and the other current collecting member has a liquid outlet.
[0032] In the above technical solution, the layout structure of the battery cells and the heat exchange components in the box is reasonable, and the space in the box is fully utilized. The battery cells and the heat exchange units are arranged alternately along the second direction, which is beneficial to sufficient heat exchange between the battery cells and the heat exchange units, so that the heat exchange components can dissipate heat from the battery cells in a timely and effective manner to adjust the operating temperature of the battery device, thereby helping to improve the performance and service life of the battery device.
[0033] In a second aspect, the utility model provides an electrical device, including: the battery device provided in the first aspect of the utility model.
[0034] In the above technical scheme, by setting the above-mentioned battery device, when the battery cell of the battery device undergoes thermal runaway, the width dimension of the gap between the current collector and the battery cell assembly or the partition structure provided in the gap can prevent the battery cell from contacting the current collector, so as to prevent the current collector from being damaged, thereby preventing the coolant in the current collector from leaking and causing a safety accident. The battery device has good safety performance, which is beneficial to improving the safety performance of the electrical device.
[0035] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS
[0036] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:
[0037] Figure 1 is a schematic diagram of a partial structure of a battery device according to some embodiments of the utility model;
[0038] Figure 2 yes Figure 1 A schematic diagram of a partial structure of a battery device from another perspective;
[0039] Figure 3 is a schematic diagram of a partial structure of a battery device according to other embodiments of the utility model;
[0040] Figure 4 is a schematic diagram of a current collecting member and a protective layer according to some embodiments of the utility model;
[0041] Figure 5 It is a schematic diagram of current collecting parts and protective layers according to other embodiments of the utility model.
[0042] Reference numerals:
[0043] 100. Battery device;
[0044] 1. Box body; 11. Accommodating chamber;
[0045] 2. Battery cells;
[0046] 3. heat exchange assembly; 31. heat exchange unit; 32. current collecting part;
[0047] 4. Clearance;
[0048] 5. Partition structure;
[0049] 6. Protective layer;
[0050] 7. Protective sleeve; 71. Thermal insulation space; 72. Outer tube layer; 73. Inner tube layer; 74. Connecting ribs. DETAILED DESCRIPTION
[0051] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.
[0052] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as those commonly understood by technicians in the technical field of this application; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.
[0053] Reference to "embodiment" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments.
[0054] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.
[0055] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.
[0056] In the embodiments of the present application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present application shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device are only exemplary descriptions and should not constitute any limitation to the present application.
[0057] The term “plurality” used in this application refers to two or more (including two).
[0058] In the embodiments of the present application, unless otherwise specified, all implementation modes and optional implementation modes of the present application can be combined with each other to form a new technical solution.
[0059] In the embodiments of the present application, unless otherwise specified, all technical features and optional technical features of the present application can be combined with each other to form a new technical solution.
[0060] In an embodiment of the present application, the battery device may include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly may include a plurality of battery cells, and the plurality of battery cells are connected in series, in parallel, or in mixed series through a busbar. For example, a battery cell assembly is generally formed by arranging a plurality of battery cells; the battery cell assembly may be a battery module, and the battery module is formed by arranging and fixing a plurality of battery cells to form an independent module. As an example, the battery module may be formed by bundling a plurality of battery cells by a cable tie.
[0061] The battery device may be a battery pack, which includes a box and one or more battery cell assemblies, and the battery cell assembly is accommodated in the box. The battery cell assembly may be a battery module, and the battery cell assembly may be accommodated in the box by fixing the battery module in the box; the battery cell assembly may also be accommodated in the box by directly fixing a plurality of battery cells to the box.
[0062] In an embodiment of the present application, the box may include a first box and a second box. The first box and the second box are buckled together to form a closed space inside the box to accommodate the battery cell assembly. The closed here means covered or closed, which can be sealed or unsealed. The first box may be a top cover or a bottom plate. For example, the box may include a top cover, a frame and a bottom plate. The top cover and the bottom plate are respectively connected to the frame, so that a closed space is formed inside the box to accommodate the battery cell assembly.
[0063] In the embodiment of the present application, the box body can be used as a part of the chassis structure of the vehicle. For example, part of the box body can become at least a part of the floor of the vehicle, or part of the box body can become at least a part of the cross beam and longitudinal beam of the vehicle.
[0064] In the embodiments of the present application, the battery cell may be a secondary battery, which refers to a battery cell that can be used continuously by activating the active material by charging after the battery cell is discharged; the battery cell may be a lithium-ion battery, a sodium-ion battery, a sodium-lithium-ion battery, a lithium metal battery, a sodium metal battery, a lithium-sulfur battery, a magnesium-ion battery, a nickel-hydrogen battery, a nickel-cadmium battery, a lead-acid battery, etc., which is not limited in the embodiments of the present application. The battery cell may be cylindrical, flat, rectangular or in other shapes, which is not limited in the embodiments of the present application. Battery cells are generally divided into three types according to the packaging method: cylindrical battery cells, square battery cells and soft-pack battery cells, which is not limited in the embodiments of the present application.
[0065] At present, judging from the development of the market situation, the application of batteries is becoming more and more extensive. Batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as military equipment and aerospace and other fields. With the continuous expansion of the application field of power batteries, the market demand is also constantly expanding.
[0066] In the related art, during the charging and discharging process of a battery device, the battery cells of the battery device will generate a large amount of heat, causing the temperature of the battery device to rise. The battery device usually has a heat exchange component that is thermally connected to the battery cells to adjust the operating temperature of the battery device and ensure that the battery device operates in the best condition, thereby improving the performance and service life of the battery device.
[0067] However, when a battery cell of a battery device experiences thermal runaway, the battery cell expands and deforms, which can easily cause contact with the current collector of the heat exchange assembly, resulting in damage to the current collector and coolant leakage, which can easily lead to safety accidents and pose a major safety hazard.
[0068] Based on this, the present application proposes a battery device, which includes: a box body, a battery cell assembly and a heat exchange assembly, the box body has a accommodating cavity, the battery cell assembly and the heat exchange assembly are arranged in the accommodating cavity, the battery cell assembly includes a plurality of battery cells, the heat exchange assembly includes a connected current collector and a heat exchange unit, the heat exchange unit has a heat exchange flow channel, the current collector has a current collecting cavity connected to the heat exchange flow channel, the heat exchange unit is thermally connected to the battery cell, and the current collector is located on at least one side of the battery cell assembly along a first direction; wherein, in the first direction, the current collector and the battery cell assembly are spaced apart so that there is a gap between the current collector and the battery cell assembly, and the width of the gap in the first direction is greater than 2 mm and / or a partition structure is provided in the gap.
[0069] In the above-mentioned battery device, by making the width dimension of the gap between the current collector and the battery cell assembly in the first direction greater than 2 mm, when the battery cell of the battery device undergoes thermal runaway, the expansion amount of the battery cell will not be greater than the width dimension of the gap in the first direction. This can avoid contact between the battery cell and the current collector, thereby avoiding damage to the current collector, thereby avoiding leakage of coolant in the current collector and causing safety accidents, which is beneficial to improving the safety performance of the battery device.
[0070] Alternatively, by providing a partition structure in the gap, when a battery cell of the battery device experiences thermal runaway, the partition structure can effectively separate the battery cell from the current collector, and can also prevent the battery cell from contacting the current collector to avoid damage to the current collector, thereby avoiding safety accidents caused by leakage of coolant in the current collector, which is beneficial to improving the safety performance of the battery device.
[0071] The battery device disclosed in the embodiments of the present application can be used in various energy storage systems that use the battery device as a power source or use the battery device as an energy storage element. In addition to being used in vehicles, the battery device can also be used for, but not limited to, mobile phones, tablets, laptops, electric toys, electric tools, battery cars, electric cars, ships, spacecraft, and the like. Among them, electric toys can include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, and the like, and spacecraft can include airplanes, rockets, space shuttles, and spacecraft, and the like.
[0072] The power-consuming device disclosed in the embodiments of the present application may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery device is provided inside the vehicle, and the battery device may be provided at the bottom, head or tail of the vehicle. The battery device may be used to power the vehicle, for example, the battery device may be used as an operating power source for the vehicle. The vehicle may also include a controller and a motor, and the controller is used to control the battery device to power the motor, for example, for the starting, navigation and working power requirements of the vehicle during driving. In some embodiments of the present application, the battery device may be used not only as an operating power source for the vehicle, but also as a driving power source for the vehicle, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle.
[0073] Reference below Figure 1-Figure 5 A battery device 100 and an electric device according to an embodiment of the present application are described.
[0074] refer to Figure 1-Figure 3 In the first aspect, the present application provides a battery device 100, which includes: a box body 1, a battery cell assembly and a heat exchange assembly 3. The box body 1 has a receiving cavity 11, and the battery cell assembly and the heat exchange assembly 3 are arranged in the receiving cavity 11. The battery cell assembly includes a plurality of battery cells 2, and the heat exchange assembly 3 includes a connected current collector 32 and a heat exchange unit 31. The heat exchange unit 31 has a heat exchange flow channel, and the current collector 32 has a current collector cavity connected to the heat exchange flow channel. The heat exchange unit 31 is thermally connected to the battery cell 2, and the current collector 32 is located on at least one side of the battery cell assembly along the first direction (as shown in the direction e1 in the reference figure).
[0075] In the first direction, the current collector 32 is spaced apart from the battery cell assembly so that there is a gap 4 between the current collector 32 and the battery cell assembly. The width of the gap 4 in the first direction is L, and L is greater than 2 mm. A partition structure 5 is provided in the gap 4 between the current collector 32 and the battery cell assembly.
[0076] For example, the width dimension L of the gap 4 between the current collector 32 and the battery cell assembly in the first direction is greater than 2 mm. When the battery cell 2 has thermal runaway, the battery cell 2 expands along the first direction and the expansion amount of the battery cell 2 along the first direction is less than the width dimension L of the gap 4. In this way, the battery cell 2 will not come into contact with the current collector 32, thereby preventing the high temperature of the battery cell 2 from causing damage to the current collector 32 and leakage of the coolant in the current collector 32.
[0077] For example, a partition structure 5 is provided in the gap 4 between the current collector 32 and the battery cell assembly in the first direction. When the battery cell 2 has thermal runaway, the partition structure 5 can effectively separate the expanded battery cell 2 from the current collector 32 , thereby preventing the battery cell 2 from contacting the current collector 32 .
[0078] For example, the width dimension L of the gap 4 between the current collector 32 and the battery cell assembly in the first direction is greater than 2 mm and a partition structure 5 is provided in the gap 4. When thermal runaway occurs in the battery cell 2, the battery cell 2 expands along the first direction and the expansion amount of the battery cell 2 along the first direction is less than the width dimension L of the gap 4. There is also a partitioning effect of the partition structure 5 between the battery cell 2 and the current collector 32. These can effectively prevent damage to the current collector 32 and leakage of coolant in the current collector 32.
[0079] Among them, the current collector 32 is located on at least one side of the battery cell assembly along the first direction, which may include the following situations: for example, the current collector 32 is located on one side of the battery cell assembly along the first direction; for another example, the current collector 32 is located on two opposite sides of the battery cell assembly along the first direction.
[0080] Optionally, the heat exchange unit 31 is a water-cooled plate, and the current collecting member 32 is a collecting pipe. There are multiple water-cooled plates, and the current collecting member 32 is disposed on two opposite sides of the multiple water-cooled plates along the first direction.
[0081] In the above technical solution, by making the width dimension L of the gap 4 between the current collector 32 and the battery cell assembly in the first direction greater than 2 mm, when the battery cell 2 of the battery device 100 undergoes thermal runaway, the expansion amount of the battery cell 2 will not be greater than the width dimension L of the gap 4 in the first direction, so that the battery cell 2 can be prevented from contacting with the current collector 32, so as to prevent the current collector 32 from being damaged, thereby preventing the coolant in the current collector 32 from leaking and causing a safety accident, which is beneficial to improving the safety performance of the battery device 100; or by providing a partition structure 5 in the gap 4, when the battery cell 2 of the battery device 100 undergoes thermal runaway, the partition structure 5 can effectively separate the battery cell 2 from the current collector 32, and also prevent the battery cell 2 from contacting with the current collector 32, so as to prevent the current collector 32 from being damaged, thereby preventing the coolant in the current collector 32 from leaking and causing a safety accident, which is beneficial to improving the safety performance of the battery device 100.
[0082] In some embodiments, the width dimension L of the gap 4 in the first direction ranges from 2 mm to 20 mm.
[0083] Optionally, the width dimension L of the gap 4 in the first direction may be 2 mm, 5 mm, 8 mm, 12 mm, 13.5 mm, 15 mm, 16 mm, 18 mm or 20 mm, etc.
[0084] In the above technical solution, if the width dimension L of the gap 4 in the first direction is less than 2 mm, the width dimension L of the gap 4 is small, and the contact between the battery cell 2 and the current collector 32 cannot be effectively avoided when the battery cell 2 of the battery device 100 has thermal runaway; if the width dimension L of the gap 4 in the first direction is greater than 20 mm, the width dimension L of the gap 4 is large, which will occupy a large space in the box body 1, which is not conducive to increasing the battery capacity of the battery device 100 and miniaturizing the battery device 100; by making the width dimension L of the gap 4 in the first direction range from 2 mm to 20 mm, the width dimension L of the gap 4 in the first direction is appropriate, which can effectively avoid the contact between the battery cell 2 and the current collector 32 when the battery cell 2 of the battery device 100 has thermal runaway, thereby avoiding the safety accident caused by the leakage of the coolant, and the gap 4 will not occupy too much space in the box body 1, which is conducive to increasing the battery capacity of the battery device 100 and miniaturizing the battery device 100.
[0085] refer to Figure 2 In some embodiments, the width dimension L of the gap 4 in the first direction ranges from 8 mm to 15 mm.
[0086] Optionally, the width dimension L of the gap 4 in the first direction may be 8 mm, 9 mm, 10.5 mm, 12 mm, 13.5 mm, 15 mm, 16 mm or 18 mm, etc.
[0087] In the above technical solution, if the width dimension L of the gap 4 in the first direction is less than 8 mm, the width dimension L of the gap 4 is small, and there is still a safety hazard of coolant leakage when the battery cell 2 of the battery device 100 has thermal runaway; if the width dimension L of the gap 4 in the first direction is greater than 15 mm, the width dimension L of the gap 4 is large, which will occupy a large space in the box body 1, which is not conducive to increasing the battery capacity of the battery device 100 and miniaturizing the battery device 100; by making the width dimension L of the gap 4 in the first direction range from 8 mm to 15 mm, the width dimension L of the gap 4 in the first direction is appropriate, and when the battery cell 2 of the battery device 100 has thermal runaway, the safety hazard of coolant leakage can be effectively reduced, thereby avoiding safety accidents caused by coolant leakage, and the gap 4 will not occupy too much space in the box body 1, which is conducive to increasing the battery capacity of the battery device 100 and miniaturizing the battery device 100.
[0088] refer to Figure 2 In some embodiments, the width of the gap 4 in the first direction is greater than A, where A is the maximum expansion amount in the first direction when the battery cell 2 undergoes thermal runaway.
[0089] In the above technical solution, by making the width dimension of the gap 4 in the first direction larger than the maximum expansion amount of the battery cell 2 in the first direction when thermal runaway occurs, the width dimension of the gap 4 can effectively prevent the expanded battery cell 2 from contacting the current collector 32, thereby effectively preventing the current collector 32 from being damaged and the cooling liquid in the current collector 32 from leaking, thereby reducing the safety hazard of the battery device 100.
[0090] In some embodiments, the partition structure 5 is a heat insulating structure or a high temperature resistant structure.
[0091] refer to Figure 3 Optionally, the partition structure 5 is formed as an insulation block. For example, the heat exchange unit 31 is a water-cooled plate, and the water-cooled plates are multiple and arranged in parallel along the second direction (as shown in the direction e2 in the reference figure), and a receiving groove is defined between two adjacent water-cooled plates. The multiple battery cells 2 are divided into multiple battery cell rows, and each battery cell row includes one or more battery cells 2 correspondingly arranged in a receiving groove. The multiple battery cells 2 are arranged along the first direction, and the insulation blocks are located at both ends of the battery cell row along the first direction and are located in the receiving groove.
[0092] Optionally, the current collecting member 32 includes a first current collecting member and a second current collecting member, a liquid inlet is formed on the first current collecting member, and a liquid outlet is formed on the second current collecting member, and the insulation blocks are divided into two groups, one group is located between the first current collecting member and the battery cell 2, and the other group is located between the second current collecting member and the battery cell 2, each group of insulation blocks has multiple insulation blocks, and the number of insulation blocks in each group is the same as the number of accommodating slots and corresponds one to one.
[0093] In the above technical scheme, by making the partition structure 5 a heat-insulating structure, when the battery cell 2 has thermal runaway, the heat-insulating structure can form a protective effect on the current collector 32, and can effectively block the heat on the battery cell 2 from being transferred to the current collector 32, thereby preventing the battery cell 2 from causing damage to the current collector 32 and thereby causing leakage of the coolant; by making the partition structure 5 a high-temperature resistant structure, when the battery cell 2 has thermal runaway at a high temperature, the high-temperature resistant structure can effectively protect the current collector 32, thereby preventing the battery cell 2 from causing damage to the current collector 32 and thereby causing leakage of the coolant.
[0094] In some embodiments, the partition structure 5 is made of thermal insulation cotton or foam plastic or nylon.
[0095] In the above technical scheme, the partition structure 5 is made of thermal insulation cotton, which has good thermal insulation performance. When the battery cell 2 has thermal runaway, the thermal insulation cotton is arranged in the gap 4 to effectively block the heat on the battery cell 2 from being transferred to the current collector 32; the partition structure 5 is made of foam plastic, which has good thermal insulation performance. When the battery cell 2 has thermal runaway, the thermal insulation cotton is arranged in the gap 4 to effectively block the heat on the battery cell 2 from being transferred to the current collector 32; the partition structure 5 is made of nylon, which has good high temperature resistance. When the battery cell 2 has thermal runaway, the current collector 32 can be effectively protected from damage.
[0096] refer to Figure 3 In some embodiments, the partition structure 5 is fixed to the battery cell assembly.
[0097] In the above technical solution, by fixing the partition structure 5 to the battery cell assembly, the installation stability and reliability of the partition structure 5 are improved.
[0098] refer to Figure 3 In some embodiments, the partition structure 5 is bonded to a side of the battery cell assembly facing the gap 4 .
[0099] In the above technical solution, by bonding the partition structure 5 to the side of the battery cell assembly facing the gap 4 , the bonding method is simple to operate and the connection is stable, which is beneficial to improving the production efficiency of the battery device 100 .
[0100] refer to Figure 4-Figure 5 In some embodiments, the partition structure 5 is fixed to the current collecting member 32 .
[0101] In the above technical solution, by fixing the partition structure 5 to the current collecting member 32 , it is beneficial to improve the installation stability and reliability of the partition structure 5 .
[0102] refer to Figure 4-Figure 5 In some embodiments, the partition structure 5 is bonded to the current collecting member 32 or the partition structure 5 and the current collecting member 32 are integrally formed.
[0103] In the above technical solution, by bonding the partition structure 5 to the current collecting part 32, the bonding method is simple to operate and the connection is stable, which is beneficial to improving the production efficiency of the battery device 100; by forming the partition structure 5 and the current collecting part 32 as one piece, the installation operation of the partition structure 5 can be omitted, and the partition structure 5 and the current collecting part 32 can be modularly installed, which is beneficial to improving the production and assembly efficiency of the battery device 100.
[0104] refer to Figure 1-Figure 5In some embodiments, the current collecting member 32 is coated with a protective layer 6, and the portion of the protective layer 6 located in the gap 4 constitutes a partition structure 5. Optionally, the protective layer 6 is a heat insulating layer or a high temperature resistant layer. Optionally, the protective layer 6 is made of nylon, for example, the protective layer 6 is made of a high temperature resistant material such as PA (polyamide, commonly known as nylon), PPA (polyphthalamide), PPS (polyphenylene sulfide), or PES (polyether sulfone).
[0105] Optionally, the protective layer 6 is a single-layer or multi-layer structure.
[0106] In the above technical solution, the protective layer 6 wrapped around the current collector 32 forms a comprehensive protection for the current collector 32. By making the part of the protective layer 6 located in the gap 4 constitute a partition structure 5, there is no need to set up a partition structure 5 separately. The protective layer 6 as a partition structure 5 can effectively prevent the battery cell 2 from causing damage to the current collector 32 and leakage of coolant when thermal runaway occurs, which is beneficial to reducing the safety risks of the battery device 100 and improving its safety performance.
[0107] refer to Figure 5 In some embodiments, the protective layer 6 is a protective sleeve 7, and a heat insulating space 71 is provided in the protective sleeve 7 or a heat insulating space 71 is defined between the protective sleeve 7 and the current collecting member 32. Optionally, the protective sleeve 7 can be integrally formed with the current collecting member 32. Optionally, the protective sleeve 7 can be an independent molded part and sleeved on the outer peripheral side of the current collecting member 32.
[0108] In the above technical solution, by providing a heat-insulating space 71 in the protective sleeve 7 or defining a heat-insulating space 71 between the protective sleeve 7 and the current collector 32, when thermal runaway occurs in the battery cell 2, the heat-insulating space 71 can effectively block the heat on the battery cell 2 from being transferred to the current collector 32, thereby avoiding damage to the current collector 32 caused by high temperature and leakage of the coolant in the current collector 32, thereby facilitating improving the safety performance of the battery device 100.
[0109] refer to Figure 5 In some embodiments, the protective sleeve 7 includes an outer tube layer 72, an inner tube layer 73 and a plurality of connecting ribs 74. The inner tube layer 73 is sleeved on the outside of the current collecting member 32. The outer tube layer 72 is located on the outer peripheral side of the inner tube layer 73 and is spaced apart from the inner tube layer 73. An insulating space 71 is defined between the outer tube layer 72 and the inner tube layer 73. The plurality of connecting ribs 74 are located between the outer tube layer 72 and the inner tube layer 73 and are spaced apart along the circumference of the inner tube layer 73. The two ends of each connecting rib 74 are respectively connected to the inner tube layer 73 and the outer tube layer 72.
[0110] In the above technical solution, the structural strength and structural stability of the protective sleeve 7 are relatively high, which is beneficial to improving the protective effect of the protective sleeve 7 on the current collecting member 32 .
[0111] refer to Figure 1-Figure 2 In some embodiments, a plurality of battery cells 2 are divided into a plurality of battery cell rows arranged along a second direction, each battery cell row includes one or more battery cells 2 arranged along a first direction, the second direction intersects with the first direction, a plurality of heat exchange units 31 are arranged at intervals along the second direction, a heat exchange unit 31 is provided between two adjacent battery cell rows, two current collectors 32 are provided, the two current collectors 32 are located on both sides of the battery cell assembly along the first direction, one of the current collectors 32 has a liquid inlet and the other current collector 32 has a liquid outlet.
[0112] For example, a plurality of battery cell rows and a plurality of heat exchange units 31 are alternately arranged along the second direction.
[0113] In the above technical solution, the layout structure of the battery cells 2 and the heat exchange assembly 3 in the box body 1 is reasonable, and the space in the box body 1 is fully utilized. The battery cells 2 and the heat exchange units 31 are alternately arranged along the second direction, which is beneficial to sufficient heat exchange between the battery cells 2 and the heat exchange units 31, so that the heat exchange assembly 3 can dissipate heat from the battery cells 2 in a timely and effective manner to adjust the operating temperature of the battery device 100, thereby facilitating the improvement of the performance and service life of the battery device 100.
[0114] Next, we will refer to Figure 1-Figure 2 A battery device 100 according to some embodiments of the present application is described.
[0115] In this embodiment, the battery device 100 includes a housing 1, a battery cell assembly and a heat exchange assembly 3, wherein the housing 1 has a receiving cavity 11, and the battery cell assembly and the heat exchange assembly 3 are arranged in the receiving cavity 11. The battery cell assembly includes a plurality of battery cells 2, and the heat exchange assembly 3 includes a connected current collector 32 and a heat exchange unit 31, wherein the heat exchange unit 31 has a heat exchange flow channel, and the current collector 32 has a current collector cavity connected to the heat exchange flow channel, and the heat exchange unit 31 is thermally connected to the battery cell 2, and the current collector 32 is located on at least one side of the battery cell assembly along the first direction.
[0116] In the first direction, the current collecting member 32 is spaced apart from the battery cell assembly so that a gap 4 is provided between the current collecting member 32 and the battery cell assembly. The width dimension of the gap 4 in the first direction is L.
[0117] The width dimension L of the gap 4 in the first direction is greater than the maximum expansion amount of the battery cell 2 in the first direction when thermal runaway occurs, and the width dimension L is in the range of 8 mm to 15 mm.
[0118] A plurality of battery cells 2 are divided into a plurality of battery cell rows arranged along a second direction, each battery cell row includes one or more battery cells 2 arranged along a first direction, the second direction intersects with the first direction, a plurality of heat exchange units 31 are arranged at intervals along the second direction, the heat exchange unit 31 is a water-cooled plate, a heat exchange unit 31 is provided between two adjacent battery cell rows, there are two current collecting parts 32, the two current collecting parts 32 are located on both sides of the battery cell assembly along the first direction, the current collecting parts 32 are current collecting tubes, one of the current collecting parts 32 has a liquid inlet and the other current collecting part 32 has a liquid outlet.
[0119] Next, we will refer to Figure 3 The battery device 100 according to some other embodiments of the present application is described. In this implementation, only the differences from the above embodiments are described.
[0120] A partition structure 5 is provided in the gap 4 between the current collector 32 and the battery cell assembly. The partition structure 5 is a heat-insulating structure or a high-temperature-resistant structure. The partition structure 5 is a heat-insulating block, and the partition structure 5 is made of heat-insulating cotton, foam plastic, or nylon.
[0121] An accommodating groove is defined between two adjacent heat exchange units 31, each battery cell row is correspondingly arranged in one accommodating groove, multiple battery cells 2 are arranged along a first direction, and the insulation blocks are located at both ends of the battery cell row along the first direction and in the accommodating groove.
[0122] The current collecting member 32 includes a first current collecting member and a second current collecting member, a liquid inlet is formed on the first current collecting member, and a liquid outlet is formed on the second current collecting member, and the thermal insulation blocks are divided into two groups, one of which is located between the first current collecting member and the battery cell row, and the other group is located between the second current collecting member and the battery cell row, and each group of thermal insulation blocks has multiple thermal insulation blocks, and the number of thermal insulation blocks in each group is the same as the number of accommodating slots and corresponds one to one.
[0123] The partition structure 5 is adhesively fixed to the side of the battery cell assembly facing the gap 4 .
[0124] Next, we will refer to Figure 4 The battery device 100 according to some other embodiments of the present application is described. In this implementation, only the differences from the above embodiments are described.
[0125] The current collecting member 32 is covered with a protective layer 6, and the portion of the protective layer 6 located in the gap 4 constitutes a partition structure 5, and the partition structure 5 is bonded and fixed to the current collecting member 32. The protective layer 6 is a high temperature resistant layer and is made of nylon.
[0126] Next, we will refer to Figure 5 The battery device 100 according to some other embodiments of the present application is described. In this implementation, only the differences from the above embodiments are described.
[0127] A protective layer 6 is disposed outside the current collecting member 32 . The protective layer 6 is a protective sleeve 7 . The portion of the protective sleeve 7 located in the gap 4 constitutes a partition structure 5 . A heat-insulating space 71 is provided inside the protective sleeve 7 .
[0128] Specifically, the protective sleeve 7 includes an outer tube layer 72, an inner tube layer 73 and a plurality of connecting ribs 74. The inner tube layer 73 is sleeved on the outside of the current collecting part 32. The outer tube layer 72 is located on the outer peripheral side of the inner tube layer 73 and is spaced apart from the inner tube layer 73. An insulating space 71 is defined between the outer tube layer 72 and the inner tube layer 73. The plurality of connecting ribs 74 are located between the outer tube layer 72 and the inner tube layer 73 and are spaced apart along the circumference of the inner tube layer 73. The two ends of each connecting rib 74 are respectively connected to the inner tube layer 73 and the outer tube layer 72.
[0129] In a second aspect, the present application provides an electrical device, including the battery device 100 described above.
[0130] In the above technical solution, by setting the above-mentioned battery device 100, when the battery cell 2 of the battery device 100 has thermal runaway, the width dimension of the gap 4 between the current collector 32 and the battery cell assembly or the partition structure 5 set in the gap 4 can prevent the battery cell 2 from contacting the current collector 32, so as to avoid damage to the current collector 32, thereby avoiding leakage of coolant in the current collector 32 and causing safety accidents. The battery device 100 has good safety performance, which is beneficial to improving the safety performance of electrical devices.
[0131] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.
[0132] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the claims and their equivalents.
Claims
1. A battery device, characterized in that: include: A box body having a containing cavity; A battery cell assembly, disposed in the accommodating cavity and comprising a plurality of battery cells; a heat exchange assembly, disposed in the accommodating cavity and comprising a connected current collector and a heat exchange unit, wherein the heat exchange unit has a heat exchange flow channel, the current collector has a current collector cavity communicated with the heat exchange flow channel, the heat exchange unit is thermally connected to the battery cell, and the current collector is located on at least one side of the battery cell assembly along the first direction; Wherein, in the first direction, the current collector is spaced apart from the battery cell assembly so that there is a gap between the current collector and the battery cell assembly, and the width of the gap in the first direction is greater than 2 mm and / or a partition structure is provided in the gap.
2. The battery device according to claim 1, characterized in that: The width of the gap in the first direction ranges from 2 mm to 20 mm.
3. The battery device according to claim 2, characterized in that: The width of the gap in the first direction ranges from 8 mm to 15 mm.
4. The battery device according to claim 1, characterized in that: The partition structure is a heat-insulating structure or a high-temperature-resistant structure.
5. The battery device according to claim 4, characterized in that: The partition structure is made of heat-insulating cotton or foam plastic or nylon.
6. The battery device according to claim 1, characterized in that: The partition structure is fixed to the battery cell assembly.
7. The battery device according to claim 6, characterized in that: The partition structure is bonded to a side of the battery cell assembly facing the gap.
8. The battery device according to claim 1, characterized in that: The partition structure is fixed to the current collecting member.
9. The battery device according to claim 8, characterized in that: The partition structure is bonded to the current collecting member or the partition structure and the current collecting member are integrally formed.
10. The battery device according to claim 8, characterized in that: The current collecting member is coated with a protective layer, and the portion of the protective layer located in the gap constitutes the partition structure.
11. The battery device according to claim 10, characterized in that: The protective layer is a protective sleeve, and a heat-insulating space is provided inside the protective sleeve, or a heat-insulating space is defined between the protective sleeve and the current collecting member.
12. The battery device according to claim 11, characterized in that: The protective sleeve includes an outer tube layer, an inner tube layer and a plurality of connecting ribs. The inner tube layer is sleeved on the outside of the current collecting part, the outer tube layer is located on the outer peripheral side of the inner tube layer and is spaced apart from the inner tube layer, the outer tube layer and the inner tube layer define the thermal insulation space, the plurality of connecting ribs are located between the outer tube layer and the inner tube layer and are arranged at intervals along the circumference of the inner tube layer, and the two ends of each connecting rib are respectively connected to the inner tube layer and the outer tube layer.
13. The battery device according to any one of claims 1 to 12, characterized in that: The multiple battery cells are divided into multiple battery cell rows arranged along a second direction, each of the battery cell rows includes one or more battery cells arranged along the first direction, the second direction intersects with the first direction, the heat exchange unit is arranged as a plurality of cells arranged at intervals along the second direction, the heat exchange unit is arranged between two adjacent battery cell rows, the current collecting parts are provided with two, the two current collecting parts are located on both sides of the battery cell assembly along the first direction, one of the current collecting parts has a liquid inlet and the other current collecting part has a liquid outlet.
14. An electrical device, characterized in that: include: A battery device according to any one of claims 1 to 13.