Battery device and electric device

Abstract

The utility model discloses a battery device and a power utilization device. The battery device comprises a box body; the at least one battery monomer assembly is arranged in the box body, the battery monomer assembly comprises a battery monomer row and a pair of side supporting plates, the battery monomer row comprises a plurality of battery monomers arranged along a first direction, and the pair of side supporting plates are respectively supported on two sides of the battery monomer row along a second direction; each battery monomer comprises an electrode terminal located on at least one side of the second direction, each side supporting plate comprises a first side and a second side which are opposite in the second direction, each battery monomer is located on the first side of the side supporting plate, the electrode terminal penetrates through the side supporting plate on the same side and is partially located on the second side of the side supporting plate, and a connecting piece is arranged on the second side of the side supporting plate; the connecting pieces are connected to the parts, penetrating through the side supporting plates, of the electrode terminals, mounting grooves are formed in the connecting pieces, and heating pieces are contained in the mounting grooves; and in the same projection plane perpendicular to the third direction, the projection of the electrode terminal and the projection of the mounting groove are at least partially overlapped.

Description

Technical Field

[0001] This application relates to the technical field of batteries, and particularly to battery devices and electrical devices. Background Art

[0002] New energy battery devices are increasingly widely used in life and industry. New energy battery devices are not only applied to energy storage power systems such as hydroelectric, thermal, wind, and solar power stations, but also widely applied to electric transportation tools such as electric bicycles, electric motorcycles, and electric vehicles, as well as multiple fields such as aerospace. With the continuous expansion of the application fields of battery devices, the market demand for them is also constantly increasing.

[0003] Currently, higher requirements are not only put forward for the performance of battery devices, but also for the volumetric energy density of battery devices. Summary of the Utility Model

[0004] To solve the above technical problems, embodiments of this application provide a battery device and an electrical device that can improve battery performance and volumetric energy density.

[0005] Embodiments of this application are implemented through the following technical solutions.

[0006] In a first aspect of embodiments of this application, a battery device is provided, including: a box body; at least one battery cell assembly disposed in the box body, the battery cell assembly including a battery cell row and a pair of side support plates, the battery cell row including a plurality of battery cells arranged along a first direction, the pair of side support plates respectively supporting both sides of the battery cell row along a second direction, the second direction being perpendicular to the first direction; each of the battery cells including electrode terminals located on at least one side in the second direction, among the pair of side support plates, the side support plate located on the same side as the electrode terminals includes a first side and a second side opposite to each other along the second direction, each of the battery cells is located on the first side of the side support plate, the electrode terminals pass through the side support plate on the same side and partially extend to the second side of the side support plate, a connecting member is provided on the second side of the side support plate, the connecting member is connected to the part of the electrode terminal passing through the side support plate, the connecting member is provided with a mounting groove, and a heating member is accommodated in the mounting groove; in the same projection plane perpendicular to a third direction, the projection of the electrode terminal and the projection of the mounting groove at least partially overlap, and the third direction is perpendicular to the first direction and the second direction.

[0007] By locating the heating element in the mounting groove of the connector, the heating element can reliably heat each battery cell through the connector, and can reduce heat loss during the heating process, thereby improving the heating efficiency, which is conducive to the battery device achieving optimal charging and discharging performance; the mounting groove and the projection of the electrode terminal on the same projection plane perpendicular to the third direction overlap with each other, and the mounting groove utilizes the space where the electrode terminal protrudes from the side support plate without occupying other space, which is conducive to improving space utilization, thereby improving the volume energy density of the battery device.

[0008] In some embodiments, the mounting groove includes an arcuate groove surface, the heating element includes an arcuate surface, and the arcuate groove surface is in tangential contact with the arcuate surface.

[0009] This helps to increase the contact area between the heating element and the mounting groove, thereby improving the heating efficiency of the battery cell.

[0010] In some embodiments, the heating element is completely sunken into the mounting groove.

[0011] The heating element does not protrude from the mounting groove, thereby not occupying additional space, which helps to improve the volume energy density of the battery device, and can also reduce heat loss during the heating process and improve heating efficiency.

[0012] In some embodiments, the slot of the mounting slot is filled with thermally conductive adhesive, and the thermally conductive adhesive covers the heating element.

[0013] The heat loss during the heating process of the heating element can be reduced, and the heating element can also be protected.

[0014] In some embodiments, the gap between the mounting slot and the heating element is filled with the thermally conductive adhesive.

[0015] This allows the heating element to be in more complete contact with the mounting groove, thereby improving heating efficiency.

[0016] In some embodiments, the surface of the heating element has a concave-convex structure.

[0017] The concave-convex structure can increase the heating area, and can also fill more thermal conductive glue on the surface of the heating part to make the contact more complete and improve the heating efficiency.

[0018] In some embodiments, the heating element includes a metal heating body and an insulating thermally conductive film wrapping the outer surface of the metal heating body.

[0019] Reduce the risk of short circuit between heating elements and connecting parts, improve reliability, and also improve thermal conductivity.

[0020] In some embodiments, the connecting member includes a main body portion and a plurality of electrical connection portions connected to the main body portion. The mounting groove is provided in the main body portion, and each of the electrical connection portions is in surface contact with the electrode terminal.

[0021] The surface contact between the electrical connection portion and the electrode terminal can increase the contact area and improve the heat conduction efficiency.

[0022] In some embodiments, the main body portion includes a part that is farther from the side support plate where it is located than the electrical connection portion along the second direction.

[0023] The part of the main body portion away from the side support plate where it is located provides a bending space for the mounting groove to be recessed toward the side support plate, which helps the mounting groove utilize the space on the second side of the side support plate where the electrode terminal passes through the side support plate.

[0024] In some embodiments, a protective plate is further provided on the second side of the side support plate. An exhaust channel is formed between the protective plate and the side support plate. The connecting member is located in the exhaust channel, and the heating element is located between the protective plate and the connecting member.

[0025] The protective plate can play a heat preservation role for the heating element, reducing heat loss during the heating process. At the same time, an exhaust channel is formed between the side support plates, eliminating the need for additional channels for exhaust, reducing space occupation, and contributing to the space utilization rate of the battery device.

[0026] In some embodiments, a plurality of ribs are provided on the second side of the side support plate. A plurality of the exhaust channels are formed between the protective plate and the side support plate. The ribs separate the plurality of exhaust channels. A plurality of the connecting members are provided, and one connecting member is correspondingly arranged in each exhaust channel.

[0027] One connecting member is correspondingly arranged in each exhaust channel, and the connecting members are independent of each other. When a battery cell connected by one connecting member undergoes thermal runaway, it will not affect the battery cells connected by other connecting members, thereby improving the reliability of the battery device.

[0028] In some embodiments, each battery cell includes the electrode terminals on both sides in the second direction. A plurality of battery cell assemblies are provided, and the plurality of battery cell assemblies are arranged along the second direction. A protective plate is provided between the side support plates of adjacent two battery cell assemblies, and the exhaust channels are formed between the protective plate and the side support plates on the opposite two sides along the second direction, and the connecting members are respectively arranged in each of the exhaust channels.

[0029] Adjacent two battery cell assemblies share one protective plate, reducing space occupation and also reducing costs.

[0030] In some embodiments, the battery cell assembly further includes a pair of end plates, and the pair of end plates are respectively located on two sides of the battery cell row along the first direction and are respectively connected to the pair of side support plates.

[0031] Thereby, the support stability of the side support plates for supporting the battery cell row can be improved.

[0032] In some embodiments, the inner diameter D of the installation groove is greater than the outer diameter d of the heating element, the groove depth h of the installation groove along the second direction is greater than the outer diameter d of the heating element, and the difference between h and d is in the range of 0.5 mm to 3 mm.

[0033] The inner diameter of the installation groove being greater than the outer diameter of the heating element is conducive to the tangential contact between the arc surface of the heating element and the arc groove surface of the installation groove. The difference between the groove depth of the installation groove and the outer diameter of the heating element being in the range of... is conducive to completely embedding the heating element in the installation groove.

[0034] In some embodiments, the battery device further includes: a first temperature sensor disposed on the outer surface of the battery cell; a second temperature sensor disposed between the connection member and the electrode terminal; a power supply module electrically connected to the heating element; and a control module electrically connected to the first temperature sensor, the second temperature sensor, and the power supply module. The control module is configured to control the power supply module to adjust the heating power of the heating element based on the difference between the temperature detected by the first temperature sensor and the temperature sensed by the second temperature sensor.

[0035] Thereby, by adjusting the heating power of the heating element, it helps each battery cell achieve the best charge and discharge performance.

[0036] The second aspect of the embodiments of the present application provides an electrical device, including: the battery device according to any one of the above embodiments.

[0037] By providing the battery device as described above, the performance of the electrical device is improved.

[0038] The beneficial effects of the embodiments of the present application include: through the present application, it helps to improve the charge and discharge performance and the volume energy density of the battery device. Description of the Drawings

[0039] By reading the detailed description of the preferred embodiments below, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered to be a limitation of the present application. And in all the drawings, the same reference numerals are used to represent the same components. In the drawings:

[0040] Figure 1Structural schematic diagram of a vehicle provided for some embodiments of the present application;

[0041] Figure 2 Simplified structural schematic diagram of a battery device provided for some embodiments of the present application;

[0042] Figure 3 Partial structural schematic diagram of a battery device provided for some embodiments of the present application;

[0043] Figure 4 For Figure 3 Partial sectional schematic diagram after sectioning along the section line A-A in

[0044] Figure 5 Structural schematic diagram of a connecting member and a heating member provided for some embodiments of the present application;

[0045] Figure 6 Partial structural schematic diagram of a battery device provided for some embodiments of the present application;

[0046] Figure 7 Exploded schematic diagram of sharing a protection plate between two adjacent side support plates provided for some embodiments of the present application;

[0047] Figure 8 Schematic diagram of the control module being electrically connected to each temperature sensor and the power supply module provided for some embodiments of the present application.

[0048] Explanation of reference numerals

[0049] 1000 - Vehicle; 100 - Battery device; 200 - Controller; 300 - Motor; 10 - Box body; 11 - First box body; 12 - Second box body; 20 - Battery cell assembly; 21 - Battery cell row; 22 - Side support plate; 23 - Connecting member; 23a - Installation groove; 231a - Arc-shaped groove surface; 24 - Heating member; 24a - Arc-shaped surface; 25 - Thermal conductive adhesive; 30 - Protection plate; 30a - Exhaust passage; 211 - Battery cell; 211a - Electrode terminal; 221 - First side; 222 - Second side; 223 - Installation hole; 224 - Rib; 231 - Main body part; 232 - Electrical connection part; 233 - Portion. Detailed description of the specific implementation

[0050] Hereinafter, embodiments of the technical solutions of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, and thus are only examples and cannot be used to limit the protection scope of the present application.

[0051] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field to which this application belongs; the terms used herein are for the purpose of describing specific embodiments only and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and the above drawings of this application are intended to cover non-exclusive inclusion.

[0052] In the description of the embodiments of this application, technical terms such as "first", "second", "third", etc. are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity, specific order or primary-secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "a plurality" is more than two, unless otherwise specifically defined.

[0053] Reference to "embodiments" herein means that a particular feature, structure or characteristic described in connection with the embodiments can be included in at least one embodiment of this application. The phrase does not necessarily refer to the same embodiment at every occurrence in the specification, nor is it an independent or alternative embodiment mutually exclusive of other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0054] In the description of the embodiments of this application, the term "and / or" is merely a description of the association relationship of associated objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " herein generally represents an "or" relationship between the associated objects before and after.

[0055] In the description of the embodiments of this application, the orientation or positional relationship indicated by technical terms such as "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the embodiments of this application and simplifying the description, rather than indicating or implying that the indicated device or element must have a specific orientation, be constructed, operated or used in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of this application.

[0056] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like 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 mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0057] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, the technical term "contact" should be understood in a broad sense, and may be direct contact or contact through an intermediate medium layer. It may be contact with essentially no interaction force between the two contacting parties, or it may be contact with interaction force between the two contacting parties.

[0058] Below, this application is described in detail.

[0059] New energy battery devices are increasingly used in life and industry. New energy battery devices are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but are also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, and aerospace and other fields. With the continuous expansion of the application field of battery devices, the market demand is also constantly expanding. At present, not only higher requirements are placed on the performance of battery devices, but also higher requirements are placed on the volume energy density of battery devices.

[0060] Take small electric vehicles as an example. With the advantages of economy, practicality and convenience, they are attracting more and more consumers. Generally, the body size of small electric vehicles is relatively compact, which limits the size of the battery device suspended from the chassis. Under the condition of limited battery device size, how to improve the volume energy density and charging and discharging performance of the battery device, thereby improving the endurance, is one of the problems that need to be solved at present.

[0061] By providing a heating element on the connecting member that connects the electrode terminals of each battery cell, the battery cells can be rapidly heated in a low-temperature environment, which helps each battery cell achieve optimal charge and discharge performance. An installation groove for mounting the heating element is formed on the connecting member to wrap the heating element, which can increase the heat conduction contact area and reduce the heat loss of the heating element during heating, thereby improving the heating efficiency. Since the position of the connecting member where the installation groove is formed protrudes to one side and occupies space, this is not conducive to improving the volumetric energy density. After research, in the case where side support plates support the battery cell from both ends of the battery cell, the electrode terminals usually pass through the side support plates, and connecting members such as busbars are connected to the electrode terminals on the side where the electrode terminals pass through. In such a structure, there is a certain available space between the electrode terminals that have passed through the side support plates in the height direction of the electrode terminals (the direction in which the electrode terminals protrude from the main body of the battery cell). After further research and design, if the installation groove provided on the connecting member is arranged in this space, this space can be effectively utilized without additionally occupying other spaces, which is beneficial to improving the space utilization rate of the battery device, thereby improving the volumetric energy density of the battery device, and further improving the endurance ability of the battery device when applied to an electric vehicle.

[0062] Based on such a design concept, the present application provides a battery device, including: a box body; at least one battery cell assembly disposed in the box body, the battery cell assembly including a battery cell row and a pair of side support plates, the battery cell row including a plurality of battery cells arranged along a first direction, the pair of side support plates respectively supporting both sides of the battery cell row along a second direction, the second direction being perpendicular to the first direction; each battery cell includes electrode terminals located on at least one side in the second direction. Among the pair of side support plates, the side support plates located on the same side of the electrode terminals include a first side and a second side opposite to each other along the second direction. Each battery cell is located on the first side of the side support plate, the electrode terminals pass through the side support plate on the same side and partially located on the second side of the side support plate, and a connecting member is provided on the second side of the side support plate. The connecting member is connected to the part of the electrode terminal passing through the side support plate, and the connecting member is provided with an installation groove, and the installation groove houses a heating element; in the same projection plane perpendicular to a third direction, the projection of the electrode terminal and the projection of the installation groove at least partially overlap, and the third direction is perpendicular to the first direction and the second direction.

[0063] The connecting member is provided with an installation groove for accommodating the heating element, so that the heating element can be more firmly located in the installation groove, thereby enabling the connecting member to reliably heat each battery cell, reducing heat loss, and improving the heating efficiency, which is beneficial for the battery device to achieve optimal charge and discharge performance; the projection of the installation groove and the projection of the electrode terminal in the same projection plane perpendicular to the third direction overlap with each other. The installation groove utilizes the space of the electrode terminal located on the second side of the side support plate, improving the space utilization rate, which is beneficial for improving the volumetric energy density of the battery device, and further improving the endurance ability of the battery device when applied to an electric vehicle.

[0064] The technical solutions described in the embodiments of the present application are applicable to various electrical devices, such as mobile phones, portable devices, laptop computers, battery cars, electric toys, power tools, vehicles, ships, and spacecrafts, etc. For example, spacecrafts include airplanes, rockets, space shuttles, and spaceships, etc.

[0065] In the following embodiments, for the convenience of description, the electrical device in an embodiment of the present application is taken as an example of vehicle 1000 for illustration.

[0066] Figure 1 The structural schematic diagram of vehicle 1000 provided for some embodiments of the present application. Vehicle 1000 can be a fuel vehicle, a gas vehicle, or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle, etc. As Figure 1 shown, a battery device 100 is disposed inside vehicle 1000. The battery device 100 can be disposed at the bottom, the head, or the tail of vehicle 1000. The battery device 100 can be used for power supply of vehicle 1000. For example, the battery device 100 can be used as the operating power source of vehicle 1000. Vehicle 1000 can also include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to supply power to the motor 300. For example, it is used for the working power requirements during the start, navigation, and driving of vehicle 1000.

[0067] In some embodiments of the present application, the battery device 100 can not only be used as the operating power source of vehicle 1000, but also be used as the driving power source of vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for vehicle 1000.

[0068] The battery device (BatteryApparatus) mentioned in the embodiments of the present application may include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly (BatteryCell Assembly) may include a plurality of battery cells. The plurality of battery cells are connected in series, parallel, or in a hybrid connection through a busbar component (connector).

[0069] In some embodiments, the battery cell assembly (BatteryCell Assembly) is usually formed by arranging a plurality of battery cells. As an example, the battery cell assembly can be a battery module (BatteryModule). 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 can be formed by fixing a plurality of battery cells through side support plates and end plates.

[0070] In some embodiments, the battery device may be a battery pack, which includes a box body and one or more battery cell assemblies accommodated in the box body.

[0071] As an example, the battery cell assembly may be a battery module, and the battery cell assembly may be accommodated in the box body by fixing the battery module in the box body.

[0072] As an example, the box body may include a first box body and a second box body. The first box body and the second box body are buckled together so that a closed space is formed inside the box body to accommodate the battery cell assembly. Here, "closed" means covered or closed, which can be sealed or non-sealed. The first box body may be a top cover or a bottom plate.

[0073] As an example, the box body 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 body to accommodate the battery cell assembly.

[0074] As an example, the box body may be part of the chassis structure of a vehicle. For example, the top cover of the box body may become at least part of the floor of the vehicle, or the frame of the box body may become at least part of the cross beam and longitudinal beam of the vehicle.

[0075] In some embodiments, the battery device refers to an energy storage device, which includes a box body, and a door is provided on at least one side of the box body. The energy storage device includes an energy storage container, an energy storage electrical cabinet, etc.

[0076] In the embodiments of the present application, the battery cell may be a secondary battery, which refers to a battery cell that can activate the active material by charging after discharging the battery cell and can be used continuously.

[0077] 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-metal hydride battery, a nickel-cadmium battery, a lead-acid battery, etc., and the embodiments of the present application are not limited thereto.

[0078] In some embodiments, the battery cell may include a housing. The housing is used to encapsulate components such as the electrode assembly and the electrolyte. The housing may be a steel shell, an aluminum shell, a plastic shell (such as polypropylene), a composite metal shell (such as a copper-aluminum composite shell), or an aluminum-plastic film, etc.

[0079] As an example, the battery cell may be a cylindrical battery cell, a prismatic battery cell, a soft-pack battery cell, or a battery cell of other shapes. The prismatic battery cell includes a square-shell battery cell, a blade-shaped battery cell, a multi-prismatic battery, and the multi-prismatic battery is, for example, a hexagonal prism battery, etc. The embodiments of the present application have no special limitations.

[0080] In some embodiments, the housing includes an end cap and a shell, the shell is provided with an opening, and the end cap closes the opening to form a closed space for accommodating substances such as the electrode assembly and the electrolyte. The shell may be provided with one or more openings. One or more end caps may also be provided.

[0081] In some embodiments, at least one electrode terminal is disposed on the housing, and the electrode terminal is electrically connected to the tab. The electrode terminal may be directly connected to the tab, or indirectly connected to the tab via a transition component. The electrode terminal may be disposed on the end cap, or on the housing.

[0082] In some embodiments, a pressure relief mechanism is provided on the housing, and the pressure relief mechanism is used to release the internal pressure of the battery cell.

[0083] Below, refer to Figures 2 to 8 Some embodiments of the present application are described in detail.

[0084] In the embodiment of the present application, the direction of the arrow X in the figure represents the first direction X, the direction of the arrow Y represents the second direction Y, and the direction of the arrow Z represents the third direction Z, wherein the first direction X, the second direction Y and the third direction Z are perpendicular to each other. As an example, the battery device 100 is installed on the chassis of the vehicle 1000, the first direction X can be the length direction of the vehicle 1000, the second direction Y can be the width direction of the vehicle 1000, and the third direction Z can be the height direction of the vehicle 1000. Of course, the battery device 100 can also be installed at other positions of the vehicle 1000, and the placement of the battery device 100 can also be adjusted accordingly as needed.

[0085] An embodiment of the present application provides a battery device 100, including: a box body 10; at least one battery cell assembly 20 disposed in the box body 10. The battery cell assembly 20 includes a battery cell row 21 and a pair of side support plates 22. The battery cell row 21 includes a plurality of battery cells 211 arranged along a first direction X. The pair of side support plates 22 are respectively supported on both sides of the battery cell row 21 along a second direction Y, and the second direction Y is perpendicular to the first direction X; each battery cell 211 includes electrode terminals 211a located on at least one side of the second direction Y. Among the pair of side support plates 22, the side support plates 22 located on the same side of the electrode terminals 211a include a first side 221 and a second side 222 opposite to each other along the second direction Y. Each battery cell 211 is located on the first side 221 of the side support plate 22, and the electrode terminals 211a pass through the side support plate 22 on the same side and partially extend to the second side 222 of the side support plate 22. A connecting member 23 is provided on the second side 222 of the side support plate 22. The connecting member 23 is connected to the part of the electrode terminal 211a passing through the side support plate 22. The connecting member 23 is provided with a mounting groove 23a, and a heating element 24 is accommodated in the mounting groove 23a; in the same projection plane perpendicular to a third direction Z, the projection of the electrode terminal 211a and the projection of the mounting groove 23a at least partially overlap, and the third direction Z is perpendicular to the first direction X and the second direction Y.

[0086] The box body 10 is used to accommodate at least one battery cell assembly 20. As an example, referring to Figure 2 , the box body 10 may include a first box body 11 and a second box body 12. The first box body 11 and the second box body 12 may be snap-connected along the third direction Z, so that a closed space is formed inside the box body 10 to accommodate at least one battery cell assembly 20. For example, one, two, three or more battery cell assemblies 20. The term "closed" here means covered or closed, which may be sealed or non-sealed. Exemplarily, the first box body 11 may be a bottom case, and the second box body 12 may be a top cover.

[0087] In one battery cell assembly 20, the battery cell assembly 20 includes a battery cell row 21 and a pair of side support plates 22 respectively supported on both sides of the battery cell row 21 along the second direction Y. The battery cell row 21 includes a plurality of battery cells 211 arranged along the first direction X. It can be understood that in one battery cell assembly 20, each battery cell 211 is located between the pair of side support plates 22, and both ends of each battery cell 211 along the second direction Y are respectively supported by the pair of side support plates 22.

[0088] The battery cell rows 21 can be arranged in multiple rows, and the multiple battery cell rows 21 are arranged along the third direction Z. As an example, in a pair of side support plates 22, a plurality of rows of mounting holes are formed on the surfaces of the respective side support plates 22 facing each other, and the plurality of rows of mounting holes (for example, three rows) are arranged along the third direction Z. Each row of mounting holes includes a plurality of mounting holes 223 arranged along the first direction X ( Figure 7 as shown), the mounting holes 223 in the pair of side support plates 22 correspond to each other one by one, and both ends of the battery cell 211 along the second direction Y are respectively mounted in the corresponding two mounting holes 223. The shape of the mounting hole 223 can be adapted to the outer shape of the battery cell 211. Exemplarily, the mounting hole 223 can be a circular hole, and the battery cell 211 can be a cylindrical battery cell. Of course, the mounting hole 223 and the battery cell 211 can also be square, prismatic or other shapes respectively.

[0089] Each battery cell 211 includes electrode terminals 211a on at least one side in the second direction Y. It can be that each battery cell 211 only includes electrode terminals 211a on one side in the second direction Y, or each battery cell 211 includes electrode terminals 211a on both sides in the second direction Y respectively.

[0090] In a pair of side support plates 22, the side support plate 22 on the same side as the electrode terminal 211a includes a first side 221 ( Figure 7 as shown) and a second side 222 opposite to each other along the second direction Y. Each battery cell 211 is located on the first side 221 of the side support plate 22, and the electrode terminal 211a passes through the side support plate 22 on the same side and is partially located on the second side 222 of the side support plate 22.

[0091] The side support plate 22 on the same side as the electrode terminal 211a can be understood as the side support plate 22 on the side where the battery cell 211 is provided with the electrode terminal 211a. If the battery cell 211 only has an electrode terminal 211a on one side in the second direction Y, the side support plate 22 on the same side as the electrode terminal 211a refers to one side support plate 22 on this side. If the battery cell 211 has electrode terminals 211a on both sides in the second direction Y respectively, the side support plate 22 on the same side as the electrode terminal 211a refers to the two side support plates 22 on these two sides.

[0092] In the side support plate 22 on the same side as the electrode terminal 211a, along the second direction Y, the side close to the battery cell 211 is the first side 221, and the side away from the battery cell 211 is the second side 222. The electrode terminal 211a of each battery cell 211 passes through the side support plate 22, so that the electrode terminal 211a is partially exposed on the second side 222 of the side support plate 22 for connection with the connector 23.

[0093] The second side 222 of the side support plate 22 is provided with a connecting member 23, and the connecting member 23 is connected to the part of the electrode terminal 211a passing through the side support plate 22. It can be understood that one connecting member 23 is respectively connected to the electrode terminals 211a of a plurality of battery cells 211 to achieve series or parallel connection between the plurality of battery cells 211.

[0094] The connecting member 23 is provided with a mounting groove 23a, and the mounting groove 23a houses a heating element 24. Exemplarily, the mounting groove 23a is formed by the connecting member 23 being recessed (bent) from one side to the other side along the second direction Y, so that the surface of the connecting member 23 on the other side corresponding to the recessed position protrudes. For example, the mounting groove 23a with one side recessed and the other side protruding corresponding to the recess can be formed by stamping. The notch of the mounting groove 23a can face the first side 221 of the side support plate 22 along the second direction Y; the notch of the mounting groove 23a can also face the second side 222 of the side support plate 22 along the second direction Y. The figure shows the case where the notch of the mounting groove 23a faces the second side 222 of the side support plate 22 along the second direction Y. The mounting groove 23a can extend along the first direction X.

[0095] The heating element 24 can generate heat by being energized, and thus transfer the heat to each battery cell 211 through the connecting member 23 by heat conduction. Of course, the heating element 24 can also achieve heat conduction with the connecting member 23 and the battery cells 211 through, for example, heat convection or other possible ways. The heating element 24 can be formed as a long member, which includes a part extending along the first direction X, and can also include a part extending along the second direction Y. Exemplarily, the heating element 24 can be a continuous long member, which extends successively along the first direction X, the second direction Y, and the first direction X and is generally formed in a U shape. The heating element 24 can also be arranged at intervals of two or more along the third direction Z. The heating element 24 can pass through the mounting grooves 23a of a plurality of connecting members 23.

[0096] In the same projection plane perpendicular to the third direction Z, the projection of the electrode terminal 211a and the projection of the mounting groove 23a at least partially overlap, which can be part or all of the projection of the part of the electrode terminal 211a located on the second side 222 of the side support plate 22 overlapping with the projection of the mounting groove 23a.

[0097] Exemplarily, referring to Figure 4 , the mounting groove 23a is located directly below the electrode terminal 211a along the third direction Z. Therefore, the mounting groove 23a utilizes the space of the part of the electrode terminal 211a passing through the side support plate 22 and exposed on the second side 222.

[0098] The connecting member 23 forms an installation groove 23a for accommodating the heating member 24, so that the heating member 24 is more firmly located in the installation groove 23a. The connecting member 23 can reliably heat each battery cell 211, and can also reduce heat loss during the heating process, improve the heating efficiency, which is beneficial for the battery device 100 to achieve the best charge and discharge performance; the projection of the installation groove 23a and the electrode terminal 211a on the same projection plane perpendicular to the third direction Z overlap each other. The installation groove 23a utilizes the space where the electrode terminal 211a is exposed on the second side 222 of the side support plate 22, minimizing the space occupation, improving the space utilization rate, and being beneficial for enhancing the volume energy density of the battery device 100.

[0099] In some embodiments, referring to Figure 5 , the installation groove 23a includes an arc-shaped groove surface 231a, and the heating member 24 includes an arc-shaped surface 24a. The arc-shaped groove surface 231a is in tangential contact with the arc-shaped surface 24a.

[0100] Exemplarily, the arc-shaped groove surface 231a may include an arc-shaped groove bottom surface and arc-shaped side surfaces located on both sides of the arc-shaped groove bottom surface. The arc-shaped side surfaces are connected to the arc-shaped groove bottom surface, and the arc-shaped groove bottom surface and the arc-shaped side surfaces on both sides are respectively in tangential contact with the arc-shaped surface 24a, thereby being able to increase the contact area between the heating member 24 and the installation groove 23a.

[0101] The installation groove 23a includes an arc-shaped groove surface 231a and the heating member 24 includes an arc-shaped surface 24a, so that the installation groove 23a can surround part of the heating member 24, increasing the contact area and also being able to reduce heat loss, thereby improving the heating efficiency.

[0102] In some embodiments, the heating member 24 is completely recessed into the installation groove 23a.

[0103] It can be understood that along the second direction Y, the heating member 24 does not extend beyond the installation groove 23a. Exemplarily, referring to Figure 5 , the inner diameter D of the installation groove 23a is greater than or substantially equal to the outer diameter d of the heating member 24, and the groove depth h of the installation groove 23a along the second direction Y is greater than the outer diameter d of the heating member 24. The difference between h and d is in the range of 0.5 mm to 3 mm. The difference between h and d can be 0.5 mm, 1 mm, 1.5 mm, 2 mm, 2.5 mm, 2.7 mm, 2.8 mm, 3 mm.

[0104] The inner diameter D of the installation groove 23a (the dimension of the installation groove perpendicular to the groove length and the groove depth direction) is greater than or substantially equal to the outer diameter d of the heating element 24, which is conducive to increasing the contact area between the arc surface of the heating element 24 and the arc groove surface 231a of the installation groove 23a. The difference between the groove depth h of the installation groove 23a and the outer diameter d of the heating element 24 is in the range of 0.5 mm to 3 mm, which is conducive to completely embedding the heating element 24 into the installation groove 23a, reducing space occupation and heat loss.

[0105] By completely embedding the heating element 24 into the installation groove 23a, the heating element 24 does not occupy extra space, which is conducive to improving the volume utilization rate of the battery device 100, thereby improving the volume energy density of the battery device 100, and is also conducive to reducing heat loss during the heating process of the heating element 24.

[0106] In some embodiments, referring to Figure 4 , a heat-conducting adhesive 25 is filled in the notch of the installation groove 23a, and the heat-conducting adhesive 25 covers the heating element 24.

[0107] Exemplarily, the heat-conducting adhesive 25 can extend beyond the installation groove 23a or be located in the installation groove 23a, can completely cover the heating element 24, or can partially cover the heating element 24. Exemplarily, the heat-conducting adhesive 25 extends beyond the installation groove 23a and completely covers the heating element 24.

[0108] Filling the notch of the installation groove 23a with the heat-conducting adhesive 25 can wrap the heating element 24 in the installation groove 23a, so that the part of the heating element 24 that does not contact the installation groove 23a can also transfer heat through the heat-conducting adhesive 25 to the connecting member 23, thereby improving the heating efficiency of the battery cell 211. In addition, it can also play a role in protecting the heating element 24.

[0109] Exemplarily, the material of the heat-conducting adhesive 25 can be epoxy resin, polyurethane, etc.

[0110] In some embodiments, referring to Figure 4 , the gap between the installation groove 23a and the heating element 24 is filled with the heat-conducting adhesive 25.

[0111] Thus, the heating element 24 can be in full contact with the installation groove 23a through the heat-conducting adhesive 25, so that the heating element 24 can heat the connecting member 23 sufficiently, improving the heating efficiency of the battery cell 211.

[0112] In some embodiments, the surface of the heating element 24 has a concavo-convex structure.

[0113] In one example, a plurality of protrusions can be formed on the surface of the heating element 24, and a concavo-convex structure is formed between the plurality of protrusions. In another example, the concavo-convex structure on the surface of the heating element 24 can be continuously wavy.

[0114] The concavo-convex structure on the surface of the heating element 24 can increase the heat dissipation area, and at the same time, it can also adhere more thermal conductive adhesive 25, so that the heating element 24 is in more sufficient contact with the installation groove 23a, thereby conducting more heat to the battery cell 211 more sufficiently.

[0115] In some embodiments, the heating element 24 includes a metal heating body and an insulating and heat-conducting film wrapped around the outer surface of the metal heating body.

[0116] The metal heating body is used for electrically connecting with the power supply module to generate heat. The insulating and heat-conducting film can play an insulating role between the heating element 24 and the connecting member 23, and at the same time, it can also improve a certain heat-conducting performance.

[0117] In some embodiments, referring to Figure 4 , the connecting member 23 includes a main body portion 231 and a plurality of electrical connection portions 232 connected to the main body portion 231. The installation groove 23a is provided in the main body portion 231, and each electrical connection portion 232 is in surface contact with the electrode terminal 211a respectively.

[0118] Exemplarily, the electrical connection portion 232 can be in surface contact by partially covering the electrode terminal 211a, or by completely covering the electrode terminal 211a.

[0119] The surface contact between the electrical connection portion 232 and the electrode terminal 211a can increase the heat-conducting area and accelerate heat conduction, thereby improving the heating efficiency of the battery cell 211.

[0120] In some embodiments, referring to Figure 4 , the main body portion 231 includes a portion 233 that is farther away from the side support plate 22 where it is located along the second direction Y than the electrical connection portion 232.

[0121] The main body portion 231 includes a portion 233 that is farther away from the side support plate 22 where it is located. The area between this portion 233 and the side support plate 22 provides space for the installation groove 23a to be recessed towards the second direction Y, which is beneficial to increasing the depth of the installation groove 23a, and further increasing the contact area between the heating element 24 and the installation groove 23a. Thus, the heating efficiency of the heat on the battery cell 211 can be improved.

[0122] In some embodiments, referring to Figure 4 , a protective plate 30 is further provided on the second side 222 of the side support plate 22. An exhaust passage 30a is formed between the protective plate 30 and the side support plate 22. The connecting member 23 is located in the exhaust passage 30a, and the heating element 24 is located between the protective plate 30 and the connecting member 23.

[0123] The exhaust passage 30a is used to direct the eruption of the explosion-proof valve when a thermal runaway occurs in the battery cell 211. By way of example, the side support plate 22 is provided with a vent hole and an exhaust hole corresponding to the position of the explosion-proof valve, and the exhaust passage 30a is respectively in communication with the vent hole and the exhaust hole.

[0124] The heating element 24 is located between the protective plate 30 and the connecting member 23. The protective plate 30 can play a role in heat preservation for the heating element 24, reducing the heat loss of the heating element 24 during the heating process.

[0125] In some embodiments, referring to Figure 3 and Figure 6 , a plurality of ribs 224 are provided on the second side 222 of the side support plate 22. A plurality of exhaust passages 30a are formed between the protective plate 30 and the side support plate 22. The ribs 224 separate the plurality of exhaust passages 30a. A plurality of connecting members 23 are provided, and one connecting member 23 is correspondingly provided in one exhaust passage 30a.

[0126] The rib 224 can be a structure continuous along the third direction Z or a discontinuous structure. The connecting member 23 in one exhaust passage 30a can connect the electrode terminals 211a of two or more battery cells 211. The number of electrode terminals 211a connected by the connecting members 23 in different exhaust passages 30a can be the same or different.

[0127] One connecting member 23 is correspondingly provided in one exhaust passage 30a, and the respective connecting members 23 are independent of each other. When a thermal runaway occurs in the battery cell 211 connected by one connecting member 23, the battery cells 211 connected by the other connecting members 23 are not affected, reducing the risk of thermal diffusion.

[0128] In some embodiments, each battery cell 211 includes electrode terminals 211a located on both sides in the second direction Y. A plurality of battery cell assemblies 20 are provided, and the plurality of battery cell assemblies 20 are arranged along the second direction Y. A protective plate 30 is provided between the side support plates 22 of two adjacent battery cell assemblies 20, and exhaust passages 30a are respectively formed between the opposite two sides of the protective plate 30 along the second direction Y and the adjacent two side support plates 22. Connecting members 23 are respectively provided in the respective exhaust passages 30a.

[0129] The number of battery cell assemblies 20 can be two, three, four or more. The protective plate 30 can be fixed to any one of the two adjacent side support plates 22.

[0130] Two adjacent battery cell assemblies 20 share one protective plate 30, which can reduce the number of protective plates 30, thereby reducing the space occupation, being beneficial to improving the volume utilization rate of the battery device, and also being able to reduce the cost.

[0131] In some embodiments, the battery cell assembly 20 further includes a pair of end plates (not shown in the figures), and the pair of end plates are respectively located on both sides of the battery cell row 21 along the first direction X and are respectively connected to a pair of side support plates 22. Exemplarily, the pair of end plates can be respectively detachably connected to the pair of side support plates 22.

[0132] The connection between the end plate and the side support plate 22 can improve the support stability of the side support plate 22 for supporting each battery cell 211.

[0133] In some embodiments, referring to Figure 8 , the battery device 100 further includes: a first temperature sensor disposed on the outer surface of the battery cell 211; a second temperature sensor disposed between the connecting member 23 and the electrode terminal 211a; a power supply module electrically connected to the heating element 24; and a control module electrically connected to the first temperature sensor, the second temperature sensor, and the power supply module. The control module is configured to control the power supply module to adjust the heating power of the heating element 24 based on the difference between the temperature detected by the first temperature sensor and the temperature sensed by the second temperature sensor.

[0134] Exemplarily, the power supply module and the control module can be integrated into the power management system of the battery device 100. The first temperature sensor can be an independent sensor. The second temperature sensor can be integrated into the sampling device in the power management system.

[0135] Exemplarily, the heating power of the heating element 24 can be adjusted based on the following relational expression. The thermal resistance of the heating element 24 is R, the thickness is L, the thermal conductivity is k1, and the surface area is A1, where

[0136] The heat generation amount of the heating element 24 is Q1, the power is P, and the heating time is t, where Q1 = Pt.

[0137] The surface temperature of the heating element 24 is T1, the heat transfer power is P1, the surface temperature of the connecting member 23 in the heating state of the heating element 24 is T2, and the thermal resistance from the heating element 24 to the connecting member 23 is R1, where P1 = 0.9P and R1 = (T1 - T2) / P1.

[0138] The temperature at the position where the connecting member 23 contacts the electrode terminal 211a is T3, and the heat transfer power of the connecting member 23 is P2, where P2 = 0.8P and R = (T2 - T3) / P2.

[0139] The temperature of the battery cell 211 is T4, the heat transfer power between the connecting member 23 and the battery cell 211 is P3, the thermal resistance from the connecting member 23 to the battery cell 211 is R3, n is a constant, and the contact area between the connecting member 23 and the electrode terminal 211a is A2, where P3 = 0.8P2 and R3 = (T3 - T4) / P3.

[0140] By adjusting the heating power of the heating element 24, it helps each battery cell 211 to achieve optimal charge and discharge performance.

[0141] Exemplarily, the first temperature sensor detects the temperature of the outer surface of the battery cell 211 as T4; the sampling member (including the second temperature sensor for sampling temperature) sandwiched between the connecting member 23 and the electrode terminal 211a obtains the temperature at the electrode terminal 211a as T3. The control module (such as a microprocessor, etc.) can control the power supply of the heating element 24 based on T3 and T4, so that the heating element 24 has a suitable surface temperature, and finally obtain suitable T3 and T4.

[0142] The following refers to Figures 2 to 7 , and a specific example of the present application will be described.

[0143] An embodiment of the present application provides a battery device 100 including a box body 10 and a plurality of battery cell assemblies 20. Referring to Figure 2 , the plurality of battery cell assemblies 20 are arranged along the second direction Y.

[0144] Each battery cell assembly 20 includes a battery cell row 21 and a pair of side support plates 22. The battery cell row 21 includes a plurality of battery cells 211 arranged along the first direction X. A pair of side support plates 22 are respectively supported on both sides of the battery cell row 21 along the second direction Y, and the second direction Y is perpendicular to the first direction X.

[0145] Each battery cell 211 includes electrode terminals 211a respectively located on both sides of the second direction Y. Each side support plate 22 includes a first side 221 and a second side 222 opposite to each other along the second direction Y.

[0146] In one battery cell assembly 20, each battery cell 211 is located between a pair of side support plates 22. The electrode terminals 211a on both sides of each battery cell 211 along the second direction Y respectively pass through a pair of side support plates 22 and partially extend to the second side 222 of their respective side support plates 22. A connecting member 23 is provided on the second side 222 of each side support plate 22. The connecting member 23 is connected to the part of the electrode terminal 211a on the same side passing through the side support plate 22. Each connecting member 23 is provided with a mounting groove 23a, and a heating element 24 is accommodated in the mounting groove 23a; in the same projection plane perpendicular to the third direction Z, the projection of the electrode terminal 211a and the projection of the mounting groove 23a at least partially overlap, and the third direction Z is perpendicular to the first direction X and the second direction Y.

[0147] A heat-conducting adhesive 25 is filled in the notch of the mounting groove 23a of each connecting member 23 and between the heating element 24 and the mounting groove 23a.

[0148] Along the second direction Y, a protective plate 30 is arranged between two adjacent battery cell assemblies 20. A plurality of exhaust channels 30a are formed between the opposite two side surfaces of the protective plate 30 and the adjacent two side support plates 22 respectively. A connecting member 23 corresponds to each exhaust channel 30a, and the heating element 24 in the mounting groove 23a is located between the connecting member 23 and the protective plate 30.

[0149] The embodiment of the present application further provides an electrical device, including: the battery device 100 described in any one of the above embodiments.

[0150] The above embodiments are only used to illustrate the technical solutions of the present application, rather than limiting them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be covered within the scope of the present application. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the present application.

Claims

1. A battery device, characterized in that, Comprising: A box body; At least one battery cell assembly, disposed within the box body, the battery cell assembly including a battery cell row and a pair of side support plates, the battery cell row including a plurality of battery cells arranged along a first direction, and the pair of side support plates respectively supporting both sides of the battery cell row along a second direction perpendicular to the first direction; Each of the battery cells includes electrode terminals located on at least one side in the second direction; Among the pair of side support plates, the side support plate located on the same side as the electrode terminals includes a first side and a second side opposite to each other along the second direction, each battery cell is located on the first side of the side support plate, and the electrode terminals pass through the side support plate on the same side and partially extend to the second side of the side support plate; A connecting member is provided on the second side of the side support plate, the connecting member is connected to the part of the electrode terminal passing through the side support plate, and the connecting member is provided with a mounting groove which houses a heating element; In the same projection plane perpendicular to a third direction, the projection of the electrode terminal and the projection of the mounting groove at least partially overlap, and the third direction is perpendicular to the first direction and the second direction.

2. The battery device according to claim 1, wherein: The mounting groove includes an arc-shaped groove surface, and the heating element includes an arc-shaped surface, and the arc-shaped groove surface is in tangential contact with the arc-shaped surface.

3. The battery device according to claim 1 or 2, wherein: The heating element is completely recessed into the mounting groove.

4. The battery device according to any one of claims 1 to 3, wherein: The notch of the mounting groove is filled with a thermally conductive adhesive, and the thermally conductive adhesive covers the heating element.

5. The battery device according to claim 4, wherein: The gap between the mounting groove and the heating element is filled with the thermally conductive adhesive.

6. The battery device according to any one of claims 1 to 5, wherein: The surface of the heating element has a concavo-convex structure.

7. The battery device according to any one of claims 1 to 6, wherein: The heating element includes a metal heating body and an insulating and thermally conductive film covering the outer surface of the metal heating body.

8. The battery device according to any one of claims 1 to 7, wherein: The connecting member includes a main body portion and a plurality of electrical connection portions connected to the main body portion, the mounting groove is provided in the main body portion, and each of the electrical connection portions is in surface contact with the electrode terminal.

9. The battery device according to claim 8, wherein: The main body portion includes a part that is farther from the side support plate where it is located than the electrical connection portion along the second direction.

10. The battery device according to any one of claims 1 to 9, wherein: A protective plate is further provided on the second side of the side support plate, an exhaust passage is formed between the protective plate and the side support plate, and the connecting member is located in the exhaust passage and the heating element is located between the protective plate and the connecting member.

11. The battery device according to claim 10, wherein: A plurality of ribs are provided on the second side of the side support plate, and a plurality of the exhaust channels are formed between the protection plate and the side support plate, and the ribs separate the plurality of exhaust channels. A plurality of the connecting members are provided, and one connecting member is correspondingly provided in one exhaust channel.

12. The battery device according to claim 10 or 11, wherein Each battery cell includes the electrode terminals located on both sides in the second direction. A plurality of the battery cell assemblies are provided, and the plurality of battery cell assemblies are arranged along the second direction. A protection plate is provided between the side support plates of two adjacent battery cell assemblies, and the exhaust channels are formed between the protection plate and the side support plates on the two opposite sides along the second direction respectively, and the connecting members are respectively provided in each exhaust channel.

13. The battery device according to any one of claims 1 to 12, wherein The battery cell assembly further includes a pair of end plates, and the pair of end plates are respectively located on both sides of the battery cell row along the first direction and are respectively connected to the pair of side support plates.

14. The battery device according to any one of claims 1 to 13, wherein The battery cell includes a cylindrical battery cell.

15. The battery device according to any one of claims 1 to 14, wherein The inner diameter D of the installation groove is greater than the outer diameter d of the heating element, the groove depth h of the installation groove along the second direction is greater than the outer diameter d of the heating element, and the difference between h and d is in the range of 0.5 mm to 3 mm.

16. The battery device according to any one of claims 1 to 15, characterized in that, Further included are: A first temperature sensor provided on the outer surface of the battery cell; A second temperature sensor provided between the connecting member and the electrode terminal; A power supply module electrically connected to the heating element; A control module electrically connected to the first temperature sensor, the second temperature sensor and the power supply module, and the control module is configured to control the power supply module to adjust the heating power of the heating element based on the difference between the temperature detected by the first temperature sensor and the temperature sensed by the second temperature sensor.

17. An electrical device, characterized in that, Including: The battery device according to any one of claims 1 to 16.

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