Battery device and electric device

Abstract

This application relates to the field of battery technology and provides a battery device and an electrical device. The battery device includes a battery cell and a heat exchange plate. The heat exchange plate carries a heat exchange medium and includes a weak portion that divides the heat exchange plate into mutually isolated yet interconnected parts to allow the heat exchange medium to flow. The heat exchange plate is in thermally conductive contact with the battery cell. The surface of the heat exchange plate in contact with the battery cell is the heat exchange surface. A surface perpendicular to the heat exchange surface and the plane on which the battery cell is placed is a first cross-section. The cross-sectional area of ​​the weak portion on the first cross-section is smaller than the cross-sectional area of ​​the rest of the heat exchange plate excluding the weak portion. The weak portion is located at least between the areas of the heat exchange plate that are in contact with the two battery cells with the largest potential difference among a plurality of battery cells. The weak portion is configured to melt within 3 seconds when a current greater than or equal to 500A passes through it. This aims to reduce the risk of short circuits caused by electrical conduction between battery cells through the heat exchange structure.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of batteries, and particularly relates to a battery device and a power utilization device. BACKGROUND

[0002] With the rise of new energy equipment represented by new energy vehicles, a battery device has become a key power source. The battery device includes a box body and a battery monomer. The battery monomer is an energy storage component. The battery monomer performs a charging and discharging reaction. During the charging and discharging process, the temperature of the battery monomer rises. Therefore, heat exchange needs to be performed on the battery monomer to ensure that the battery monomer is within a normal temperature range.

[0003] In the related art, a heat exchange plate is used to perform heat exchange on the battery monomer. The heat exchange plate is generally in contact with multiple battery monomers to perform heat exchange. There may be a high potential difference between different battery monomers. If the insulation between the heat exchange plate and the battery monomers fails, the different battery monomers may conduct electricity through the heat exchange plate, and a short circuit between the battery monomers may occur. SUMMARY

[0004] In view of the above problems, the application provides a battery device and a power utilization device, which aims to reduce the risk of short circuit caused by the conduction between battery monomers through a heat exchange structure.

[0005] To solve the above problems, in a first aspect, the application provides a battery device, comprising:

[0006] a battery monomer; and

[0007] a heat exchange plate, the heat exchange plate being used to circulate a heat exchange medium, the heat exchange plate comprising a weak portion, the weak portion separating a structure of the heat exchange plate other than the weak portion into multiple parts that are isolated from each other and connected to each other through the weak portion to enable the heat exchange medium to circulate between different parts, the heat exchange plate being in heat-conducting contact with multiple battery monomers, a surface of the heat exchange plate in contact with the battery monomers being a heat exchange surface, a surface perpendicular to a plane in which the heat exchange surface is located and perpendicular to a plane in which the battery monomers are placed being a first cross section, a cross-sectional area of the weak portion on the first cross section being smaller than a cross-sectional area of the parts of the heat exchange plate other than the weak portion on the first cross section, the weak portion being arranged at least between regions of the heat exchange plate respectively contacted by two battery monomers with the largest potential difference among the multiple battery monomers, and the weak portion being configured to be able to be melted and to remove the connectivity between the parts of the heat exchange plate separated by the weak portion within 3 seconds when a current passing through is greater than or equal to 500 A.

[0008] The effect of the embodiment is that the weak part is arranged on the heat exchange plate. Even if the insulation between the battery monomer and the heat exchange plate fails, the weak part can be melted by a certain intensity of current within a certain time, thereby reducing the risk of short circuit between the battery monomers in contact with the heat exchange plate through the heat exchange plate. At the same time, in order not to affect the circulation of the heat exchange medium, the weak part of the embodiment also has a communication function, that is, before the weak part is melted, the weak part has a communication function, which can communicate the heat exchange plate parts on both sides to make the heat exchange medium circulate, which isolates the two parts of the heat exchange plate, but the two parts are communicated through the weak part, and the heat exchange medium can circulate, which does not affect the circulation of the heat exchange medium. When the weak part is melted, the structure is damaged, and the communication function is lost.

[0009] In one embodiment of the first aspect, the weak part is arranged between the regions of the heat exchange plate contacted by any two of the battery monomers.

[0010] The embodiment provides a potential difference threshold value, that is, the battery monomer with a potential difference greater than 80V needs to contact the mutually isolated parts on both sides of the weak part, so as to reduce the risk of short circuit, and the weak part is more easily melted when the potential difference is 80V.

[0011] In one embodiment of the first aspect, the weak part is arranged between the regions of the heat exchange plate contacted by any two of the battery monomers.

[0012] In the embodiment, the weak part is arranged between the regions of the same heat exchange plate contacted by any two of the battery monomers, thereby reducing the risk of short circuit between any two of the battery monomers through the heat exchange plate, and greatly improving the use safety of the battery device.

[0013] In one embodiment of the first aspect, the heat exchange plate is arranged along a first direction, and the battery device comprises a plurality of battery monomers arranged in sequence along the first direction and in heat-conducting contact with the heat exchange plate.

[0014] The embodiment provides a corresponding arrangement mode of the heat exchange plate and the plurality of battery monomers. First, it is beneficial to heat dissipation, and second, it is beneficial to the corresponding selection of the position of the weak part. The position can be selected according to the potential relationship of the battery monomers arranged in the same direction.

[0015] In one embodiment of the first aspect, the number of the plurality of battery monomers arranged along the first direction is M, and the battery monomers are sequentially connected in the conductive circuit according to the arrangement order in the first direction.

[0016] The weak part is arranged at least between regions of the heat exchange plate contacted by the Nth battery cell and the N+1th battery cell arranged along the first direction, wherein N is M / 2 if M is even, or (M-1) / 2 or (M+1) / 2 if M is odd.

[0017] The embodiment has an effect that the weak part is arranged at least between regions of the heat exchange plate contacted by two battery cell groups with a larger potential difference, so that the short circuit risk is reduced.

[0018] In one embodiment of the first aspect, the weak part divides the heat exchange plate into a plurality of sub-heat exchange plates which are separated from each other and connected to each other through the weak part, and the plurality of battery cells are in thermal contact with the plurality of sub-heat exchange plates one by one.

[0019] The embodiment has an effect that the isolation of each battery cell is realized, and when the surface insulation of any battery cell fails, continuous conduction through the structure of the heat exchange plate is not caused, so that the risk of short circuit between different battery cells through the heat exchange plate is greatly reduced.

[0020] In one embodiment of the first aspect, one weak part is arranged between two adjacent sub-heat exchange plates of the heat exchange plate.

[0021] The embodiment has an effect that one weak part is arranged between two sub-heat exchange plates, so that the reliability of the fuse is improved, and if more than one weak part is arranged, it is necessary to ensure that each weak part is fused at the same time, and arranging one weak part also simplifies the structure and saves the cost.

[0022] In one embodiment of the first aspect, the minimum distance between any two adjacent sub-heat exchange plates is less than or equal to the minimum distance between two adjacent battery cells in thermal contact with each other.

[0023] The embodiment has an effect that the battery cells have a distance therebetween, and the sub-heat exchange plates also have a distance therebetween, and the minimum distance between the sub-heat exchange plates is less than or equal to the minimum distance between the battery cells, because it is necessary to make the sub-heat exchange plates cover the battery cells as much as possible to ensure the heat exchange effect of the battery cells.

[0024] In one embodiment of the first aspect, the minimum distance between any two adjacent sub-heat exchange plates is greater than or equal to 2mm.

[0025] The effect of this embodiment is that the sub-heat exchange plates maintain a sufficiently large gap to prevent direct contact and conductivity between them. At the same time, it is also to adapt to the battery cells in the battery device. The battery cells in the battery device are spaced apart, so the corresponding sub-heat exchange plates are also spaced apart. Furthermore, the minimum gap between the sub-heat exchange plates is set to be greater than or equal to 2mm according to the gap between the battery cells, so that the sub-heat exchange plates and the battery cells they contact can be set accordingly.

[0026] In one embodiment of the first aspect, the area of ​​the heat exchange surface located on the sub-heat exchange plate is greater than or equal to the area of ​​the surface of the battery cell facing the sub-heat exchange plate.

[0027] The advantage of this embodiment is that the area of ​​the heat exchange surface is greater than or equal to the area of ​​the surface of the battery cell it contacts, which can improve the heat exchange efficiency.

[0028] In one embodiment of the first aspect, the weak portion includes a connecting pipe, the cross-sectional area of ​​which in the direction of heat exchange medium flow perpendicular to the connecting pipe is smaller than the cross-sectional area of ​​the portion of the heat exchange plate excluding the weak portion in the first cross-section.

[0029] This embodiment provides a weak section including a connecting pipe, and provides a cross-sectional area of ​​the pipe body that is at least smaller than the cross-sectional area of ​​the heat exchange plate excluding the weak section on the first cross section, so that it can be melted under the action of a preset current.

[0030] In one embodiment of the first aspect, the cross-sectional area of ​​the connecting pipe in the direction perpendicular to the flow direction of the heat exchange medium inside the connecting pipe is 0.5 mm²-1.6 mm².

[0031] The advantage of this embodiment is that it provides a range of cross-sectional areas for the connecting tube based on the expected voltage and current, which can improve the fusing rate.

[0032] In one embodiment of the first aspect, the heat exchange plate has a heat exchange channel, and there are multiple connecting pipes. The multiple connecting pipes are arranged in parallel and are all connected to the heat exchange channels of the heat exchange plates on both sides. The sum of the flow areas of the multiple connecting pipes is greater than or equal to the flow area of ​​the heat exchange channel.

[0033] The advantage of this embodiment is that it provides multiple connecting pipes, increases the overall flow area, increases the flow rate of the heat exchange medium, and does not affect the heat exchange efficiency.

[0034] In one embodiment of the first aspect, the ratio of the flow area of ​​a single connecting pipe to the flow area of ​​the heat exchange channel is 1 / 10 to 1 / 2.

[0035] This embodiment provides the ratio of the flow area of ​​a single connecting pipe to the flow area of ​​the heat exchange channel. This ratio can be used as a reference to set the number of connecting pipes and the cross-sectional area of ​​the connecting pipe body, so that the flow rate is not affected and the fusion can be achieved.

[0036] In one embodiment of the first aspect, the weak portion is further covered with an insulator.

[0037] The advantage of this embodiment is that it can prevent the connecting pipe from being disturbed by external factors, ensure the stability of its structure, improve the reliability of use, and the heat exchange medium that flows out after melting can also be wrapped by the insulator and not flow out.

[0038] In one embodiment of the first aspect, the material of the weak portion is the same as the material of the portion of the heat exchange plate excluding the weak portion.

[0039] The advantage of this embodiment is that both parts use the same material, making them easy to connect and source. The weakest part can be made of aluminum or stainless steel.

[0040] Secondly, this application also provides an electrical device, including the battery device described in any of the embodiments.

[0041] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0042] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0043] Figure 1 This is a schematic diagram of the vehicle structure according to some embodiments of this application;

[0044] Figure 2 This is a schematic diagram of the structure of a battery device according to some embodiments of this application;

[0045] Figure 3 This is a schematic diagram of the structure of the heat exchange plate in some embodiments of this application;

[0046] Figure 4 for Figure 3 A partial sectional view of the heat exchanger plate;

[0047] Figure 5for Figure 4 Schematic diagram of the weakest part in the middle;

[0048] Figure 6 for Figure 3 A schematic diagram of the structure of the heat exchange plate in thermal contact with the battery cell.

[0049] Figure 7 This is a schematic diagram of the structure of a battery cell and a heat exchange plate in a battery device according to some embodiments of this application.

[0050] The reference numerals in the detailed embodiments are as follows:

[0051] 1000, vehicles;

[0052] 100. Battery assembly; 200. Controller; 300. Motor;

[0053] 10. Heat exchange plate; 11. Weak part; 111. Connecting pipe; 12. Sub-heat exchange plate; 13. Battery cell; 14. Insulator; 15. Heat exchange channel. Detailed Implementation

[0054] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0055] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0056] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0057] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0058] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0059] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0060] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0061] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0062] Currently, judging from market trends, the application of battery devices is becoming increasingly widespread. Battery devices are not only used in energy storage power systems such as hydropower, thermal power, wind power, and solar power plants, but also widely applied in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in military and police equipment and aerospace. With the continuous expansion of battery application areas, the market demand is also constantly increasing.

[0063] The battery unit is a complete structural unit, including a housing. Multiple individual battery cells are housed inside the housing; in some special scenarios, only one individual battery cell may be housed inside the housing. When there are multiple individual battery cells, they can be arranged in a row to form a battery cell assembly.

[0064] In some embodiments, the housing may be part of the vehicle's chassis structure. For example, a portion of the housing may be at least a part of the vehicle's floor, or a portion of the housing may be at least a part of the vehicle's crossbeams and longitudinal beams.

[0065] A battery device may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells connected in series, parallel, or mixed series-parallel configurations via a busbar.

[0066] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells.

[0067] As an example, a battery cell assembly can be a battery module, which consists of multiple battery cells arranged and fixed together to form an independent module. Alternatively, a battery cell assembly can be formed by bundling multiple battery cells together with cable ties.

[0068] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more individual battery cell assemblies housed within the housing.

[0069] As an example, the battery cell assembly can be a battery module, which can be housed in a housing by fixing the battery module in the housing.

[0070] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0071] This application provides an electrical device having a battery device 100, that is, an electrical device that uses the battery device 100 as a power source.

[0072] The technical solutions described in this application are applicable to various electrical devices using battery device 100, including vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools. Vehicles can be gasoline-powered cars, natural gas-powered cars, or new energy vehicles; new energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles. Spacecraft include airplanes, rockets, space shuttles, and spacecraft. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys. Power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers. This application does not impose any special limitations on the above-mentioned electrical devices.

[0073] The battery device 100 disclosed in this application can be used, but is not limited to, in electrical devices such as vehicles, ships, or aircraft. Electrical devices can use power systems equipped with the battery device 100 disclosed in this application, which helps improve the reliability of the electrical devices.

[0074] For ease of explanation, the following embodiments will use a vehicle 1000 as an example of the electrical device provided in this application.

[0075] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of a vehicle 1000 provided in some embodiments of this application. The vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery device 100 is provided inside the vehicle 1000, and the battery device 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000; for example, the battery device 100 can serve as the operating power source for the vehicle 1000. The vehicle 1000 may 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, to meet the power needs of the vehicle 1000 during starting, navigation, and driving.

[0076] In some embodiments of this application, the battery device 100 can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0077] like Figure 2 This is the battery device 100 provided in the embodiments of this application. The battery cells 13 of the battery device 100 are capable of charging and discharging reactions.

[0078] The temperature of the battery cell 13 will rise during the charging and discharging process. To ensure its normal operating temperature, a heat exchange device is required.

[0079] In related technologies, heat exchange is performed on battery cells using heat exchange plates made of metal. The battery cell casing is charged, and the heat exchange plates and battery cells exchange heat in contact, with insulation between them. However, if the insulation between the heat exchange plates and battery cells fails, the battery cells with a high potential difference are more likely to conduct electricity through the heat exchange plates, thus causing a short circuit.

[0080] Based on this, please refer to Figures 2-7 This application provides a specific embodiment of a battery device 100.

[0081] The battery device 100 of this embodiment includes a battery cell 13 and a heat exchange plate 10. The heat exchange plate 10 is used for circulating a heat exchange medium. The heat exchange plate 10 includes a weak portion 11, which divides the structure of the heat exchange plate 10, excluding the weak portion 11, into multiple mutually isolated parts that are interconnected through the weak portion 11, so that the heat exchange medium can circulate between the different parts. The heat exchange plate 10 is in thermal contact with the multiple battery cells 13. The surface of the heat exchange plate 10 that contacts the battery cells 13 is the heat exchange surface, which is perpendicular to the plane containing the heat exchange surface and to the plane containing the multiple battery cells. The plane perpendicular to the plane on which the body 13 is placed is the first cross section. The cross-sectional area of ​​the weak part 11 on the first cross section is smaller than the cross-sectional area of ​​the heat exchange plate 10 excluding the weak part 11 on the first cross section. The weak part 11 is provided at least between the areas of the heat exchange plate 10 that are in contact with the two battery cells 13 with the largest potential difference among the plurality of battery cells 13. The weak part 11 is configured to melt within 3 seconds and disconnect the connection between the heat exchange plate 10 parts separated by the weak part 11 when the current passing through is greater than or equal to 500A.

[0082] Specifically, the battery cell 13 contacts the heat exchange plate 10 to achieve heat conduction. The heat exchange plate 10 provided in this embodiment includes a weak part 11, which divides the heat exchange plate 10, so that the divided parts of the heat exchange plate 10 are isolated. The function of the weak part 11 is that it can be melted within a certain time when current flows through, so that the heat exchange plate 10 will not form continuous conductivity, which can reduce the risk of short circuit between battery cells 13.

[0083] The weak point 11 is configured to melt within 3 seconds when the current passing through it is greater than or equal to 500A.

[0084] Within this range, the weak point 11 can be melted within 3 seconds. This range is also obtained with reference to the potential difference that may exist between the battery cells 13. Specifically, the melting needs to be limited to a certain time to effectively avoid short circuits. This embodiment provides that when a preset current of 500A is applied, the melting will occur within 3 seconds, which can greatly reduce the risk of short circuits between the battery cells 13.

[0085] When the insulation between two battery cells 13 with a potential difference and the heat exchange plate 10 in contact fails, the heat exchange plate 10 is provided with a weak part 11. When current passes through the weak part 11, the current can be cut off by melting the weak part 11, reducing the risk of short circuit.

[0086] The weak section 11 can be made of the same material as the heat exchange plates 10 on both sides, but the cross-section of the weak section 11 is smaller, so it can be melted when a certain current passes through it. Specifically, the cross-sectional area of ​​the weak section 11 on the first section is smaller than the cross-sectional area of ​​the rest of the heat exchange plate 10 on the first section, excluding the weak section 11. In other words, in the heat exchange plate 10, the cross-sectional area of ​​the weak section 11 on the first section is smaller than the cross-sectional area of ​​the other parts on the first section. The cross-sectional area here refers to the area after the solid parts of both are cut off, and does not include the area after the flow channels used for the heat exchange medium inside are cut off.

[0087] The heat exchange plate 10 contacts the battery cell 13. The surface of the heat exchange plate 10 in contact with the battery cell 13 is the heat exchange surface. The first cross-section is a surface perpendicular to the heat exchange surface and also perpendicular to the plane on which the multiple battery cells 13 are placed. The battery cell 13 can be placed inside the housing of the battery device 100. The plane on which the battery cell 13 is placed can be the surface of the housing of the battery device 100 used to support the battery cell 13, or it can be the bottom surface of the housing. Multiple battery cells 13 are placed on the same plane. Because the cross-section of the weak part 11 is small, it can be melted when a current of a certain intensity passes through the weak part 11. The weak part 11 may not participate in heat exchange, that is, the weak part 11 may not contact the battery cell 13. The cross-section of the weak part 11 on the first cross-section can be the cross-section through which current passes. The smaller its area, the easier it is to be melted. In this embodiment, its area is set to be at least smaller than the cross-sectional area of ​​the part of the heat exchange plate 10 excluding the weak part 11 on the first cross-section.

[0088] The heat exchange plates 10 on both sides of the weak part 11 are interconnected through the weak part 11, that is, the heat exchange medium between the two sides of the structure can flow to each other, so that the heat exchange medium can flow through each part separated by the weak part 11.

[0089] The location of the weak point 11 on the heat exchange plate 10 is subject to certain requirements. The risk of short circuit between battery cells 13 with a large potential difference is higher and the consequences are more serious. Therefore, it is necessary to avoid short circuit between battery cells 13 with a large potential difference. Thus, this embodiment provides that the weak point 11 is provided at least between the areas of the heat exchange plate 10 that are in contact with the two battery cells 13 with the largest potential difference among the multiple battery cells 13 in contact with the same heat exchange plate 10.

[0090] The advantage of this embodiment is that a weak portion 11 is provided on the heat exchange plate 10. Even if the insulation between the battery cell 13 and the heat exchange plate 10 fails, the weak portion 11 can be melted by a current of a certain intensity within a certain time, thereby reducing the risk of short circuits between battery cells 13 that are in common contact with the heat exchange plate 10 through the heat exchange plate 10. At the same time, in order not to affect the flow of the heat exchange medium, the weak portion 11 in this embodiment also has connectivity. That is, before the weak portion 11 melts, it has connectivity, which can connect the two sides of the heat exchange plate 10 to allow the heat exchange medium to flow. Although it isolates the two parts of the heat exchange plate 10, the two parts are connected through the weak portion 11, and the flow of the heat exchange medium can be allowed without affecting the flow of the heat exchange medium. When the weak portion 11 is melted, its structure is damaged, and it loses its connectivity.

[0091] It should be noted that this application applies to situations where a heat exchange medium with low conductivity is used, such as a heat exchange medium with a conductivity below 100 μS / cm. It is not applicable to heat exchange media with a conductivity higher than this. The conductivity of the heat exchange medium flowing through the heat exchange plate 10 is low, much lower than the conductivity of the material of the heat exchange plate 10 itself, and the conductivity factor of the heat exchange medium can be ignored.

[0092] In some embodiments, the weak portion 11 is provided at least between the regions of the heat exchange plate 10 that are respectively contacted by two battery cells 13 with a potential difference greater than 80V among the plurality of battery cells 13.

[0093] Specifically, within the battery device 100, multiple battery cells 13 are electrically connected to each other for proper power output or charging. Therefore, potential differences may exist between battery cells 13 connected at different locations. Some battery cells 13 have larger potential differences, thus increasing the likelihood of short circuits and potentially causing more severe consequences. Therefore, it is necessary to reduce the short circuit risk between battery cells 13 with large potential differences, i.e., a weak point 11 needs to be provided between the areas of the heat exchange plate 10 they contact. This embodiment provides a weak point 11 between the areas of the same heat exchange plate 10 contacted by two battery cells 13 with a potential difference greater than 80V, in order to reduce the short circuit risk.

[0094] This embodiment provides a critical potential difference value, that is, battery cells 13 with a potential difference greater than 80V need to contact the mutually isolated parts on both sides of the weak part 11 to reduce the risk of short circuit, and the weak part 11 is more likely to melt when the potential difference is 80V.

[0095] In some embodiments, please refer to Figure 6 and Figure 7 The weak part 11 is located between the areas of the heat exchange plate 10 that are in contact with any two of the multiple battery cells 13.

[0096] Specifically, in this embodiment, a weak part 11 is provided between the areas of the same heat exchange plate 10 that any two battery cells 13 come into contact with, thereby reducing the risk of short circuit between any two battery cells 13 through the heat exchange plate 10 and greatly improving the safety of the battery device 100.

[0097] In some embodiments, please refer to Figure 6 , Figure 7 The heat exchange plate 10 is arranged along a first direction, and the battery device 100 includes at least a plurality of battery cells 13 arranged sequentially at intervals along the first direction and in thermal contact with the heat exchange plate 10. The first direction can be... Figure 7 The X direction in the equation.

[0098] This embodiment provides the arrangement of battery cells 13 and heat exchange plates 10 inside the battery device 100. The first direction can be any direction, specifically a horizontal direction parallel to the inner wall of the battery device 100. The heat exchange plate 10 is long and straight, extending along the first direction. In order to facilitate heat dissipation, the battery device 100 has at least a plurality of battery cells 13 arranged along the first direction, so that the plurality of battery cells 13 can correspond well with the heat exchange plate 10, thereby improving the heat exchange effect.

[0099] The battery device 100 may include multiple heat exchange plates 10, which are parallel to each other and arranged along a first direction. Each heat exchange plate 10 can also be provided with a row of multiple battery cells 13 arranged in the same direction. That is, one heat exchange plate 10 corresponds to multiple battery cells 13. The battery cells 13 in different rows contact different heat exchange plates 10, so they will not conduct electricity through the same heat exchange plate 10. The battery cells 13 in the same row contact the same heat exchange plate 10, but the risk of short circuit is reduced because the heat exchange plate 10 is provided with a weak part 11.

[0100] Therefore, among the multiple battery cells 13 in contact with the same heat exchange plate 10, weak points 11 can be set between the areas of the heat exchange plate 10 corresponding to certain battery cells 13. Specifically, the battery cells 13 with the largest potential difference can be selected. Alternatively, battery cells 13 with a potential difference greater than 80V can be selected, or any two battery cells 13 can be selected.

[0101] This embodiment provides a corresponding arrangement of the heat exchange plate 10 and multiple battery cells 13, which is beneficial for heat dissipation and for the corresponding selection of the weak part 11 position. The setting position can be selected based on the potential relationship of the battery cells 13 arranged in the same direction.

[0102] In some embodiments, please refer to Figure 6 , Figure 7The number of multiple battery cells 13 arranged along the first direction is M, and they are connected in series in the conductive line according to the arrangement order in the first direction.

[0103] The weak part 11 is provided at least between the areas of the heat exchange plate 10 that are respectively contacted by the Nth battery cell 13 and the N+1th battery cell 13 arranged along the first direction. If M is even, then N is M / 2. If M is odd, then N is (M-1) / 2 or (M+1) / 2.

[0104] Specifically, this embodiment provides the selection and placement of the weak point 11 in a structure consisting of a plurality of battery cells 13 arranged along a first direction and a heat exchange plate 10 extending along the first direction.

[0105] The number of battery cells 13 arranged along the first direction can be M, where M can be odd or even. However, M must be greater than 1. The battery cells 13 being connected in series in the conductive circuit according to their arrangement order along the first direction means that the order of the battery cells 13 in the series circuit is arranged according to their arrangement order along the first direction. This results in the potential of the battery cells 13 arranged sequentially along the first direction decreasing or increasing sequentially. In this case, a weak point 11 can be provided between the areas of the heat exchange plate 10 that are respectively contacted by two battery cells 13 located in the middle position, thereby isolating the battery cells 13 with large potential differences on both sides. Specifically, it is provided between the areas of the heat exchange plate 10 that are respectively contacted by the Nth battery cell 13 and the (N+1)th battery cell 13 arranged along the first direction. If M is even, N is M / 2; if M is odd, N is (M-1) / 2 or (M+1) / 2.

[0106] The advantage of this embodiment is that a weak point 11 is provided between the areas of the heat exchange plate 10 that are in contact with the two groups of battery cells 13 with large potential differences, which can reduce the risk of short circuit.

[0107] In some embodiments, please refer to Figure 6 , Figure 7 The weak part 11 divides the heat exchange plate 10 into a plurality of mutually separated sub-heat exchange plates 12 that are interconnected through the weak part 11, and the plurality of battery cells 13 are in thermal contact with the plurality of sub-heat exchange plates 12 in a one-to-one correspondence.

[0108] Specifically, the heat exchange plate 10 is divided into multiple sub-heat exchange plates 12 by the weak portion 11, which means that the sub-heat exchange plates 12 are isolated from each other, but can be connected through the weak portion 11 without affecting the flow of the heat exchange medium. The multiple battery cells 13 are in one-to-one thermal contact with the multiple sub-heat exchange plates 12, which means that each battery cell 13 contacts an independent sub-heat exchange plate 12.

[0109] The advantage of this embodiment is that it achieves isolation of each battery cell 13. When the surface insulation of any battery cell 13 fails, it will not continue to conduct electricity through the structure of the heat exchange plate 10, which greatly reduces the risk of short circuit between different battery cells 13 through the heat exchange plate 10.

[0110] In some embodiments, please refer to Figure 3 , Figure 4 , Figure 6 and Figure 7 A weak section 11 is provided between two adjacent sub-heat exchange plates 12 of the heat exchange plate 10.

[0111] Specifically, this embodiment provides a weak section 11 between the two sub-heat exchange plates 12.

[0112] The advantage of this embodiment is that a weak part 11 is provided between the two sub-heat exchange plates 12, which can improve the reliability of the fuse. If there is more than one, it is necessary to ensure that each weak part 11 is fused. At the same time, providing a weak part 11 also simplifies the structure and saves costs.

[0113] In some embodiments, the minimum distance between any two adjacent sub-heat exchange plates 12 is less than or equal to the minimum distance between two adjacent battery cells 13 that are in thermal contact with each other.

[0114] Specifically, there is a gap between adjacent battery cells 13 and a gap between adjacent sub-heat exchange plates 12. The minimum gap of the latter should be less than or equal to the minimum gap of the former, because it is necessary to make the sub-heat exchange plates 12 completely cover the battery cells 13 as much as possible to ensure the heat exchange effect of the battery cells 13.

[0115] In some embodiments, the minimum distance between any two adjacent sub-heat exchange plates 12 is greater than or equal to 2 mm.

[0116] Specifically, the sub-heat exchange plates 12 are spaced apart. In this embodiment, the minimum distance between any two sub-heat exchange plates 12 is greater than or equal to 2 mm. For example, multiple plate-shaped sub-heat exchange plates 12 are arranged sequentially along the same direction, and the minimum distance between adjacent sub-heat exchange plates 12 is greater than or equal to 2 mm.

[0117] The effect of this embodiment is that the sub-heat exchange plates 12 maintain a sufficiently large gap to prevent direct contact and conductivity between them. At the same time, it is also to adapt to the battery cells 13 in the battery device 100. The battery cells 13 in the battery device 100 are spaced apart, so the corresponding sub-heat exchange plates 12 are also spaced apart. Furthermore, the minimum gap between the sub-heat exchange plates 12 is set to be greater than or equal to 2mm according to the gap between the battery cells 13, so that the sub-heat exchange plates 12 and the battery cells 13 they contact can be correspondingly arranged.

[0118] In some embodiments, please refer to Figure 6 , Figure 7 The area of ​​the heat exchange surface of the sub-heat exchange plate 12 is greater than or equal to the area of ​​the surface of the battery cell 13 facing the sub-heat exchange plate 12.

[0119] The advantage of this embodiment is that the area of ​​the heat exchange surface is greater than or equal to the area of ​​the surface of the battery cell 13 it contacts, which can improve the heat exchange efficiency.

[0120] In some embodiments, the weak portion 11 includes a connecting pipe 111, the cross-sectional area of ​​which in the direction perpendicular to the flow of the heat exchange medium within the connecting pipe 111 is smaller than the cross-sectional area of ​​the portion of the heat exchange plate 10 excluding the weak portion 11 on the first cross-section. Simultaneously, the cross-sectional area of ​​the connecting pipe 111 on the first cross-section is also smaller than the cross-sectional area of ​​the portion of the heat exchange plate 10 excluding the weak portion 11 on the first cross-section.

[0121] Specifically, this embodiment provides a weak part 11 including a connecting pipe 111. The connecting pipe 111 is a tubular structure with holes for the flow of heat exchange medium, thereby connecting the heat exchange plates 10 on both sides. When the connecting pipe 111 is used, the flow direction of the heat exchange medium is also the flow direction of the current. Therefore, the size of the cross-sectional area perpendicular to the flow direction of the heat exchange medium determines whether it can be melted by the current. Therefore, the cross-sectional area needs to be set to be small, at least smaller than the cross-sectional area of ​​the heat exchange plate 10 excluding the weak part 11 on the first cross-section.

[0122] The cross-sectional area of ​​the connecting pipe 111 perpendicular to the flow direction of the heat exchange medium refers to the cross-sectional area of ​​the pipe body, excluding the cross-sectional area of ​​the pipe cavity. It belongs to the cross-sectional area of ​​the solid part, because the solid part is used to carry current, and the melting is also the melting of the solid part. The same applies to the cross-sectional area of ​​the connecting pipe 111 on the first section.

[0123] This embodiment provides a weak part 11 including a connecting pipe 111, and provides a cross-sectional area of ​​the pipe body portion that is at least smaller than the cross-sectional area of ​​the heat exchange plate 10 excluding the weak part 11 on the first cross section, so that it can be melted under the action of a preset current.

[0124] In some embodiments, the cross-sectional area of ​​the connecting pipe 111 in the direction perpendicular to the flow of the heat exchange medium within the connecting pipe 111 is 0.5 mm²-1.6 mm².

[0125] Specifically, in order for the connecting pipe 111 to melt when a preset current is applied, it is necessary to reduce the withstand capability of the connecting pipe 111 to a certain extent so that it can melt under a certain amount of heat. Therefore, it is necessary to define the cross-sectional area of ​​the pipe body. Based on the potential difference between the battery cells 13 and the expected current, this embodiment provides that the cross-sectional area of ​​the connecting pipe 111 is 0.5mm²-1.6mm². The connecting pipe 111 includes a central hole and an outer wall. The cross-sectional area of ​​the connecting pipe 111 provided in this embodiment refers to the cross-sectional area of ​​the pipe body, which is also the cross-sectional area of ​​the pipe wall, so that the heat generated when the current passes through can melt the connecting pipe 111.

[0126] The advantage of this embodiment is that it provides a range of cross-sectional areas for the tube body of the connecting pipe 111 based on the expected voltage and current, which can improve the fusing rate.

[0127] In some embodiments, please refer to Figure 4 , Figure 5 The heat exchange plate 10 has a heat exchange channel 15 and multiple connecting pipes 111. The multiple connecting pipes 111 are arranged in parallel and are all connected to the heat exchange channel 15 of the heat exchange plate 10 on both sides. The sum of the flow areas of the multiple connecting pipes 111 is greater than or equal to the flow area of ​​the heat exchange channel 15.

[0128] The heat exchange plates 10 on both sides of the connecting pipe 111 are provided with heat exchange channels 15 inside, and may be provided with inlets and outlets connecting the heat exchange channels 15, which are connected to the connecting pipe 111. The heat exchange plates 10 on both sides of the connecting pipe 111 may refer to the sub-heat exchange plates 12 in the above embodiment.

[0129] Specifically, the heat exchange channel 15 is arranged in a circuitous manner within the heat exchange plate 10, but ultimately connects to the inlet and outlet on the surface of the heat exchange plate 10 to allow the heat exchange medium to flow in and out. In this embodiment, the connecting pipe 111 can connect the inlet and outlet, thereby enabling the heat exchange plate 10 portions on both sides of the connecting pipe 111 to be interconnected.

[0130] Multiple connecting pipes 111 can be set, and the multiple connecting pipes 111 are connected in parallel and spaced apart.

[0131] Each connecting pipe 111 can connect to the heat exchange channels 15 within the heat exchange plates 10 on both sides.

[0132] Please see Figure 4 and Figure 5Specifically, one approach is to install a sheet-like structure at the inlet or outlet to block it, and then open the sheet-like structure with the same number of openings as the connecting pipes 111, with each opening connected to a connecting pipe 111. Alternatively, an extension pipe can be installed at the inlet or outlet, and a sheet-like structure can be installed at the opening of the extension pipe, with the connecting pipes 111 connected to this sheet-like structure.

[0133] In this embodiment, the multiple connecting tubes 111 are arranged in parallel. Therefore, when a voltage is applied to each connecting tube 111, the voltage at each connecting tube 111 is approximately the same, resulting in approximately the same current. All connecting tubes 111 will melt, thereby blocking the current. The multiple connecting tubes 111 are spaced apart to avoid contact and interference.

[0134] The flow area of ​​a single connecting pipe 111 is smaller than that of the heat exchange channel 15. The flow area refers to the cross-sectional area of ​​the channel through which the heat exchange medium can pass through the connecting pipe 111 or the heat exchange channel 15. This also makes the cross-sectional area of ​​the connecting pipe 111 itself smaller, resulting in higher sensitivity of the fuse. That is, when the potential difference between the two battery cells 13 is applied, the fuse rate is increased.

[0135] The sum of the flow areas of the multiple connecting pipes 111 is greater than or equal to the flow area of ​​the heat exchange channel 15. Specifically, the heat exchange channel 15 is a single channel, and its flow area refers to the cross-sectional area of ​​the inner hole of the heat exchange medium that can pass through the heat exchange channel 15 in the direction perpendicular to the flow direction of the heat exchange medium. Each connecting pipe 111 also has a certain flow area, which refers to the cross-sectional area of ​​the inner hole of the heat exchange medium that can pass through the connecting pipe 111 in the direction perpendicular to the flow direction of the heat exchange medium. The sum of the flow areas of the multiple connecting pipes 111 refers to the sum of the cross-sectional areas of the inner holes of each connecting pipe 111. When the sum of the flow areas of the multiple connecting pipes 111 is greater than or equal to the flow area of ​​the heat exchange channel 15, the flow rate of the heat exchange medium at the connecting pipes 111 will not be affected.

[0136] The advantage of this embodiment is that it provides multiple connecting pipes 111, which increases the overall flow area and the flow rate of the heat exchange medium without affecting the heat exchange efficiency.

[0137] In some cases, the sum of the cross-sectional areas of all the connecting pipes 111 in the direction perpendicular to the flow of the heat exchange medium within the connecting pipes 111 may be less than the cross-sectional area of ​​the portion of the heat exchange plate 10 excluding the weak portion 11 on the first cross-section. Alternatively, the sum of the cross-sectional areas of all the connecting pipes 111 on the first cross-section may also be less than the cross-sectional area of ​​the portion of the heat exchange plate 10 excluding the weak portion 11 on the first cross-section.

[0138] In some embodiments, the ratio of the flow area of ​​a single connecting pipe 111 to the flow area of ​​the heat exchange channel 15 is 1 / 10 to 1 / 2.

[0139] Specifically, this embodiment provides the ratio of the flow area of ​​a single connecting pipe 111 to the flow area of ​​the heat exchange channel 15. This ratio can be used as a reference to set the number of connecting pipes 111 and the cross-sectional area of ​​the pipe body of the connecting pipe 111, so that the flow rate is not affected and the fusion can be achieved. The number of connecting pipes 111 can be 2-10.

[0140] In some embodiments, please refer to Figure 3 , Figure 4 The weak part 11 is also covered with an insulator 14.

[0141] Since the weak part 11 is a fusible structure, its structural strength may be low. Therefore, this embodiment provides that the weak part 11 is wrapped with an insulator 14. The insulator 14 can be an insulating adhesive, which can wrap the weak part 11 in an encapsulated form. When the weak part 11 includes multiple connecting tubes 111, each connecting tube 111 is wrapped with an insulator 14 to isolate them from each other.

[0142] The effect of this embodiment is that it can prevent the connecting pipe 111 from being disturbed by the outside world, ensure the stability of its structure, improve the reliability of use, and the heat exchange medium flowing out after melting can also be wrapped by the insulator 14 and not flow out.

[0143] In some embodiments, the material of the weak portion 11 is the same as the material of the portion of the heat exchange plate 10 excluding the weak portion 11.

[0144] The advantage of this embodiment is that both parts use the same material, making them easy to connect and source. The weak part 11 can be made of aluminum or stainless steel.

[0145] This application also provides an electrical device, including the battery device 100 provided in any embodiment. Because the safety of using the battery device 100 is improved, the reliability of the electrical device is also enhanced.

[0146] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery device, characterized in that, include: Battery cell; as well as A heat exchange plate is used to circulate a heat exchange medium. The heat exchange plate includes a weak portion, which divides the structure of the heat exchange plate, excluding the weak portion, into multiple isolated but interconnected parts, allowing the heat exchange medium to circulate between different parts. The heat exchange plate is in thermal contact with multiple battery cells. The surface of the heat exchange plate in contact with the battery cells is a heat exchange surface. A first cross-section is a surface perpendicular to the plane of the heat exchange surface and perpendicular to the plane on which the multiple battery cells are placed. The cross-sectional area of ​​the weak portion on the first cross-section is smaller than the cross-sectional area of ​​the portion of the heat exchange plate excluding the weak portion on the first cross-section. The weak portion is at least located between the regions of the heat exchange plate that are in contact with the two battery cells with the largest potential difference among the multiple battery cells. The weak portion is configured to melt within 3 seconds and disconnect the communication between the heat exchange plate parts separated by the weak portion when a current greater than or equal to 500A passes through it.

2. The battery device as claimed in claim 1, characterized in that, The weak point is at least located between the areas of the heat exchange plates that are in contact with two of the multiple battery cells whose potential difference is greater than 80V.

3. The battery device as claimed in claim 1, characterized in that, The weak point is located between the areas of the heat exchange plates that are in contact with any two of the battery cells.

4. The battery device as claimed in claim 1, characterized in that, The heat exchange plate is arranged along a first direction, and the battery device includes at least a plurality of battery cells arranged at intervals along the first direction and in thermal contact with the heat exchange plate.

5. The battery device as claimed in claim 4, characterized in that, The number of the plurality of battery cells arranged along the first direction is M, and they are connected in series in the conductive circuit according to the arrangement order in the first direction. The weak point is at least located between the areas of the heat exchange plates that the Nth and N+1th battery cells arranged along the first direction contact respectively. If M is even, then N is M / 2. If M is odd, then N is (M-1) / 2 or (M+1) / 2.

6. The battery device as claimed in claim 1, characterized in that, The weak section divides the heat exchange plate into multiple mutually separated but interconnected sub-heat exchange plates, and the multiple battery cells make thermal contact with the multiple sub-heat exchange plates in a one-to-one correspondence.

7. The battery device as claimed in claim 6, characterized in that, The weak point is provided between two adjacent sub-heat exchange plates of the heat exchange plate.

8. The battery device as claimed in claim 6, characterized in that, The minimum distance between any two adjacent sub-heat exchange plates is less than or equal to the minimum distance between two adjacent battery cells that are in thermal contact with each other.

9. The battery device as claimed in claim 6, characterized in that, The minimum spacing between any two adjacent sub-heat exchange plates is greater than or equal to 2 mm.

10. The battery device as claimed in claim 6, characterized in that, The area of ​​the heat exchange surface located on the sub-heat exchange plate is greater than or equal to the area of ​​the surface of the battery cell facing the sub-heat exchange plate.

11. The battery device according to any one of claims 1-10, characterized in that, The weak part includes a connecting pipe, and the cross-sectional area of ​​the connecting pipe in the direction perpendicular to the flow of the heat exchange medium inside the connecting pipe is smaller than the cross-sectional area of ​​the heat exchange plate excluding the weak part on the first cross-section.

12. The battery device as claimed in claim 11, characterized in that, The cross-sectional area of ​​the connecting pipe in the direction perpendicular to the flow of the heat exchange medium inside the connecting pipe is 0.5 mm²-1.6 mm².

13. The battery device as claimed in claim 11, characterized in that, The heat exchange plate has a heat exchange channel, and there are multiple connecting pipes. The multiple connecting pipes are arranged in parallel and are all connected to the heat exchange channels of the heat exchange plate on both sides. The sum of the flow areas of the multiple connecting pipes is greater than or equal to the flow area of ​​the heat exchange channel.

14. The battery device as claimed in claim 13, characterized in that, The ratio of the flow area of ​​a single connecting pipe to the flow area of ​​the heat exchange channel is 1 / 10 to 1 / 2.

15. The battery device according to any one of claims 1-10, characterized in that, The weak part is also covered with an insulator.

16. The battery device according to any one of claims 1-10, characterized in that, The material of the weak part is the same as the material of the rest of the heat exchange plate except for the weak part.

17. An electrical appliance, characterized in that, Includes the battery device according to any one of claims 1-16.

Images