Battery device and electric appliance

Abstract

The application discloses a battery device and a power utilization equipment, and relates to the technical field of battery devices. The battery device comprises a battery monomer and a heat exchange plate. The heat exchange plate comprises a first plate body and a second plate body. The second plate body is arranged opposite to the first plate body. The second plate body has a first region and a second region. The first region is concavely provided with a groove in the direction of the first plate body. The battery monomer is arranged in the groove. The bottom wall of the groove is arranged in close contact with the surface of the first plate body facing the second plate body. The second region and the first plate body form a heat exchange flow channel. The first plate body and the second plate body are connected and seal the heat exchange flow channel. The technical scheme can improve the heat exchange effect of the heat exchange plate on the battery monomer.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery device and an electrical appliance. Background Technology

[0002] During high-rate charging, the temperature of the individual battery cells rises rapidly, which further extends the fast charging time. In related technologies, heat exchange plates are usually placed at the bottom of the battery cells. However, the heat exchange plates can only cool the bottom of the battery cells, resulting in poor heat dissipation for the battery cells. Utility Model Content

[0003] The main objective of this application is to provide a battery device and electrical equipment that aims to improve the problem of poor heat exchange effect of the heat exchange plate of the battery device on the individual battery cells.

[0004] To achieve the above objectives, the battery device proposed in this application includes a battery cell and a heat exchange plate; the heat exchange plate includes a first plate and a second plate, the second plate being disposed opposite to the first plate, the second plate having a first region and a second region, the first region having a recessed groove facing the first plate, the battery cell being disposed in the groove, the bottom wall of the groove being fitted to the surface of the first plate facing the second plate; a heat exchange channel is formed between the second region and the first plate, and the first plate and the second plate are connected and seal the heat exchange channel.

[0005] The technical solution of this application arranges the first plate and the second plate of the heat exchange plate in the battery device opposite to each other. The first region of the second plate is recessed towards the first plate to form a groove, and the battery cell is disposed in the groove. A heat exchange channel is formed between the second region of the second plate and the first plate. The sidewall of the battery cell can be directly heated by the heat exchange medium in the heat exchange channel between the second region and the first plate. The bottom wall of the battery cell can be heated by the heat exchange medium in the heat exchange channel through the bottom wall of the groove, and can also be heated by the external environment through the first plate. Therefore, the bottom surface and at least part of the sidewall of the battery cell in this application can be heated simultaneously, thereby increasing the heat exchange area of ​​the battery cell, improving the heat exchange effect, and making the temperature rise of the battery cell less obvious under high-rate fast charging.

[0006] Furthermore, by placing the battery cells within the groove, the sidewalls of the groove can limit the movement of the battery cells, thus improving their stability and reducing the risk of uncontrolled movement. When fixing the battery cells within the groove, only the bottom wall of the groove needs to be coated with adhesive; there's no need to coat the second area of ​​the second plate, further reducing adhesive usage and material costs. Forming the groove by recessing the second plate towards the first plate simplifies the groove molding process and lowers material costs. The second area of ​​the second plate without the groove, together with the first plate, forms a heat exchange channel. The heat exchange medium can flow within this channel, rapidly removing heat from the battery cells and improving heat exchange efficiency. Additionally, by attaching the bottom wall of the groove to the surface of the first plate facing the second plate, the first plate also supports the bottom wall of the groove, reducing the risk of deformation under pressure from the battery cells and increasing the support strength of the heat exchange plate for the battery cells.

[0007] In one embodiment of this application, the groove is elongated and extends along a second direction, and is provided in multiple places at intervals along a first direction, wherein the first direction and the second direction are arranged at an angle; at least part of the heat exchange channel is formed between the area between each two adjacent grooves and the first plate.

[0008] By arranging multiple grooves at intervals along a first direction, a heat exchange channel is formed between each pair of adjacent grooves. This allows the grooves and heat exchange channels to be arranged alternately along the first direction. The heat exchange medium within the heat exchange channels can simultaneously remove heat from two adjacent battery cells arranged along the first direction, thereby improving heat dissipation efficiency. Furthermore, by extending the grooves along a second direction, the grooves can accommodate more battery cells, allowing more surfaces of more battery cells to exchange heat effectively simultaneously, thus enhancing the heat exchange effect.

[0009] In one embodiment of this application, a main liquid inlet is provided on the first plate or the second plate, and a main liquid outlet is provided on the first plate or the second plate; the heat exchange channel includes: A liquid inlet channel is formed between the first plate and the second region and is connected to the main liquid inlet. A liquid outlet channel, formed between the first plate and the second region, and connected to the main liquid outlet; and The branch flow channel is formed between the area between each two adjacent grooves and the first plate; the two ends of each branch flow channel are respectively connected to the inlet flow channel and the outlet flow channel.

[0010] With this configuration, multiple branch channels are connected in parallel, which shortens the flow distance and time of the heat exchange medium to each branch channel, reduces flow resistance, and makes the heat exchange medium flow distribution in each branch channel more uniform, which is beneficial to improving the heat exchange uniformity and heat exchange efficiency of the heat exchange plate.

[0011] In one embodiment of this application, at least a portion of the liquid inlet channel and at least a portion of the liquid outlet channel are formed between the sidewalls at both ends of the groove and the edge of the second plate, respectively.

[0012] With this configuration, by forming at least a portion of the inlet flow channel and at least a portion of the outlet flow channel between the two ends of the groove and the edge of the second plate, the heat exchange medium enters each branch flow channel from the inlet flow channel, flows through each branch flow channel in the second direction, and then directly enters the outlet flow channel without turning. This makes the flow of the heat exchange medium smoother, which helps to reduce the resistance of the heat exchange medium flow and improve the heat exchange efficiency.

[0013] In one embodiment of this application, the groove includes a first sub-groove and a second sub-groove spaced apart along a second direction; at least a portion of the liquid inlet channel or at least a portion of the liquid outlet channel is formed in the region between the first sub-groove and the second sub-groove.

[0014] This configuration results in a relatively small number of battery cells in the first and second sub-slots, thus reducing the risk of poor heat dissipation between two adjacent battery cells arranged in the second direction.

[0015] Furthermore, by forming at least a portion of the inlet channel or at least a portion of the outlet channel in the region between the first sub-tank and the second sub-tank, the heat exchange medium can flow simultaneously to at least two branch channels in two opposite directions along the second direction after flowing out of the inlet channel, thereby improving the flow efficiency; or it can reduce the flow path efficiency from each branch channel to the outlet channel, thereby improving the uniformity and flow efficiency of the heat exchange medium flow in each branch channel, and thus improving the heat exchange uniformity and heat exchange efficiency of the heat exchange plate to each battery cell.

[0016] In one embodiment of this application, the distance between two adjacent grooves along the first direction is set to W, where 3mm ≤ W ≤ 10mm.

[0017] This configuration ensures smooth flow of the heat exchange medium and good heat dissipation, while also making the heat exchange plate structure more compact, which is beneficial to improving the energy density of the battery device.

[0018] In one embodiment of this application, the sidewalls of the groove are enclosed to form a closed annular shape.

[0019] This design further increases the contact area between the battery cells and the heat exchange plate, which helps to improve heat dissipation efficiency. In addition, this design can also effectively position and limit the battery cells located in the groove, reducing the risk of horizontal displacement of the battery cells.

[0020] In one embodiment of this application, the sidewall of the groove does not coincide with the edge of the second plate when projected onto the second plate.

[0021] This configuration creates a certain distance between the sidewall of the groove and the edge of the second plate. This distance can be used to form a flow channel structure for the heat exchange medium to flow; or the area between the sidewall of the groove and the edge of the second plate can be used directly as a connection area, thereby improving the connection strength and providing good sealing for the heat exchange channel, reducing the risk of the heat exchange medium leaking from the edge of the heat exchange plate.

[0022] In one embodiment of this application, at least two battery cells are provided, and a heat insulation layer is provided between at least two adjacent battery cells.

[0023] This design effectively blocks the lateral transfer of heat between adjacent battery cells, reducing the risk of thermal crosstalk; it also absorbs the dimensional changes of battery cells caused by thermal expansion during use, reducing the risk of direct squeezing and collision between battery cells.

[0024] In one embodiment of this application, the ratio of the depth dimension of the groove to the thickness dimension of the second plate is not less than 2 and not greater than 4.

[0025] This configuration provides a larger sidewall contact area, improving heat exchange effect and efficiency; it also allows the second plate to have sufficient structural strength and good stamping performance.

[0026] In one embodiment of this application, the battery device includes a box body and a box cover, the heat exchange plate forms the bottom plate of the box body, and the heat exchange plate is disposed opposite to the box cover; the box body and the box cover together enclose a cavity, and the battery cell is disposed in the cavity.

[0027] By incorporating the heat exchange plate into the bottom plate of the housing, the volume occupied by the heat exchange plate within the cavity jointly enclosed by the housing body and the cover can be reduced. This allows for the placement of more individual battery cells within the cavity, increasing battery capacity. Furthermore, this design reduces material costs and enables the heat generated by the individual battery cells to dissipate more quickly outside the battery pack, resulting in better heat dissipation.

[0028] This application also proposes an electrical device including the aforementioned battery device.

[0029] The technical solution of this application arranges the first plate and the second plate of the heat exchange plate of the battery device in the electrical equipment opposite to each other. The first region of the second plate is recessed towards the first plate to form a groove, and the battery cell is disposed in the groove. A heat exchange channel is formed between the second region of the second plate and the first plate. The side wall of the battery cell can be directly heated by the heat exchange medium in the heat exchange channel between the second region and the first plate. The bottom wall of the battery cell in the battery device can be heated by the heat exchange medium in the heat exchange channel through the bottom wall of the groove, and can also be heated by the external environment through the first plate. Therefore, the bottom surface and at least part of the side wall of the battery cell in this application can be heated at the same time, thereby increasing the heat exchange area of ​​the battery cell and making the temperature rise of the battery cell less obvious under high-rate fast charging.

[0030] In addition, by placing the battery cell in the groove, the sidewall of the groove can limit the sidewall of the battery cell, thus improving the stability of the battery cell and reducing the risk of the battery cell moving at will. When the battery cell is fixed in the groove, only the bottom wall of the groove needs to be coated with adhesive, and there is no need to coat it in the second area of ​​the second plate, thus reducing the amount of adhesive used and reducing material costs. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, 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 the structures shown in these drawings without creative effort.

[0032] Figure 1 This is a schematic diagram of the vehicle structure according to some embodiments of this application; Figure 2 This is an exploded structural diagram of one embodiment of the battery device according to some embodiments of this application; Figure 3 This is an exploded structural diagram of a battery cell according to some embodiments of this application; Figure 4 This is an exploded structural diagram of a heat exchange plate and a battery cell in a battery device according to some embodiments of this application. Figure 5 This is an exploded structural diagram of a heat exchange plate and a battery cell in a battery device according to some embodiments of this application. Figure 6 for Figure 4 A magnified view of a section at point A in the middle; Figure 7 This is an exploded structural diagram of another embodiment of the battery device according to some embodiments of this application.

[0033] Explanation of icon numbers: 1000, vehicles; 100. Battery assembly; 200. Controller; 300. Motor; 10. Box body; 11. Box body; 12. Box lid; 20. Battery cell; 21. End cap; 21a. Electrode terminal; 22. Housing; 23. Electrode assembly; 23a. Tab; 30. Heat exchange plate; 31. First plate body; 32. Second plate body; 321. Groove; 3211. First sub-groove; 3212. Second sub-groove; 301. Main liquid inlet; 302. Main liquid outlet; 303. Liquid inlet channel; 304. Liquid outlet channel; X, the first direction; Y, the second direction.

[0034] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0035] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0036] It should be noted that if the embodiments of this application involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0037] Furthermore, if the embodiments of this application involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution that simultaneously satisfies A and B. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed in this application.

[0038] Currently, judging from market trends, the application of power batteries is becoming increasingly widespread. Power batteries are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but also extensively used in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. With the continuous expansion of power battery applications, market demand is also constantly increasing.

[0039] This application provides an electrical device that uses a battery as a power source. The electrical device can be, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0040] For ease of explanation, the following embodiments will be described using a vehicle 1000 as an example of an electrical device according to an embodiment of this application.

[0041] 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.

[0042] 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.

[0043] Please refer to Figure 2The battery device 100 includes a housing 10 and battery cells 20, with the battery cells 20 housed within the housing 10. The housing 10 provides a space for the battery cells 20 and can have various structures. In some embodiments, the housing 10 may include a first part and a second part, which overlap each other, together defining a space for accommodating the battery cells 20. The second part may be a hollow structure with one open end, while the first part may be a plate-like structure, with the first part covering the open side of the second part so that the first and second parts together define the space. Alternatively, both the first and second parts may be hollow structures with one open side, with the open side of the first part covering the open side of the second part. Of course, the housing 10 formed by the first and second parts can have various shapes, such as a cylinder or a cuboid.

[0044] Each battery cell 20 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited to these. The battery cell 20 can be cylindrical, flat, cuboid, or other shapes.

[0045] Please refer to Figure 3 , Figure 2 This is an exploded structural diagram of a battery cell 20 provided in some embodiments of this application. The battery cell 20 refers to the smallest unit constituting the battery device 100. For example... Figure 3 The battery cell 20 includes an end cap 21, a housing 22, an electrode assembly 23, and other functional components.

[0046] End cap 21 refers to a component that covers the opening of housing 22 to isolate the internal environment of battery cell 20 from the external environment. The shape of end cap 21 can be adapted to the shape of housing 22 to fit it. Optionally, end cap 21 can be made of a material with certain hardness and strength (such as aluminum alloy), so that end cap 21 is not easily deformed under pressure and impact, allowing battery cell 20 to have higher structural strength and improved safety performance. Functional components such as electrode terminals 21a can be provided on end cap 21. Electrode terminals 21a can be used for electrical connection with electrode assembly 23 to output or input electrical energy to battery cell 20. In some embodiments, end cap 21 can also be provided with a pressure relief mechanism for releasing internal pressure when the internal pressure or temperature of battery cell 20 reaches a threshold. The material of end cap 21 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this application embodiment does not impose special limitations on this. In some embodiments, an insulating element may be provided on the inner side of the end cap 21. The insulating element can be used to isolate the electrical connection components within the housing 22 from the end cap 21 to reduce the risk of short circuits. For example, the insulating element may be made of plastic, rubber, etc.

[0047] The housing 22 is a component used to cooperate with the end cap 21 to form the internal environment of the battery cell 20. This internal environment can accommodate the electrode assembly 23, electrolyte, and other components. The housing 22 and the end cap 21 can be independent components. An opening can be provided on the housing 22, and the end cap 21 can be used to close the opening to form the internal environment of the battery cell 20. Alternatively, the end cap 21 and the housing 22 can be integrated. Specifically, the end cap 21 and the housing 22 can form a common connecting surface before other components are inserted into the housing. When it is necessary to encapsulate the interior of the housing 22, the end cap 21 closes the housing 22. The housing 22 can be of various shapes and sizes, such as cuboid, cylindrical, hexagonal prism, etc. Specifically, the shape of the housing 22 can be determined according to the specific shape and size of the electrode assembly 23. The material of the housing 22 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc. This application embodiment does not impose any special limitations on this.

[0048] Electrode assembly 23 is the component in the battery cell 20 where the electrochemical reaction occurs. The casing 22 may contain one or more electrode assemblies 23. The electrode assembly 23 is mainly formed by winding or stacking positive and negative electrode sheets, and typically a separator is provided between the positive and negative electrode sheets. The portions of the positive and negative electrode sheets containing active material constitute the main body of the electrode assembly 23, while the portions of the positive and negative electrode sheets without active material each constitute a tab 23a. The positive and negative tabs may be located together at one end of the main body or separately at both ends of the main body. During the charging and discharging process of the battery device 100, the positive and negative active materials react with the electrolyte, and the tabs 23a connect to the electrode terminals 21a to form a current loop.

[0049] In the battery device 100, there can be multiple battery cells 20. These multiple battery cells 20 can be connected in series, parallel, or in a mixed configuration. A mixed configuration means that some of the multiple battery cells 20 are connected in series while others are in parallel. Multiple battery cells 20 can be directly connected in series, parallel, or in a mixed configuration, and then the entire assembly of these multiple battery cells 20 is housed within the housing 10. (For further details, please refer to...) Figure 2 The battery device 100 can also consist of multiple battery cells 20 connected in series, parallel, or in a mixed configuration to form a battery cell assembly, which is then connected in series, parallel, or in a mixed configuration to form a whole and housed within the housing 10. For example... Figure 2 As shown, the battery device 100 may also include other structures. For example, the battery device 100 may also include a heat exchange plate 30, which is usually located below the battery cell 20 or the battery cell assembly. It may be located inside the housing 10 or directly serve as the bottom plate of the housing 10.

[0050] During high-rate charging, the temperature of the battery cell 20 of the battery device 100 rises rapidly, which further extends the fast charging time of the battery device 100. In related technologies, a heat exchange plate 30 is usually provided at the bottom of the battery cell 20, and the surface of the heat exchange plate 30 in contact with the bottom of the battery cell 20 is flat. This means that the heat exchange plate 30 can only cool the bottom surface of the battery cell 20, resulting in poor heat dissipation effect of the heat exchange plate 30 on the battery cell 20.

[0051] To improve the poor heat dissipation effect of the heat exchange plate 30 of the battery device 100 on the battery cells 20, please refer to the following: Figure 4 and Figure 5 This application proposes a battery device 100, which includes a battery cell 20 and a heat exchange plate 30. The heat exchange plate 30 includes a first plate 31 and a second plate 32. The second plate 32 is disposed opposite to the first plate 31. The second plate 32 has a first region and a second region. The first region is recessed with a groove 321 in the direction of the first plate 31. The battery cell 20 is disposed in the groove 321. The bottom wall of the groove 321 is attached to the surface of the first plate 31 facing the second plate 32. A heat exchange channel is formed between the second region and the first plate 31. The first plate 31 and the second plate 32 are connected and seal the heat exchange channel.

[0052] The heat exchange plate 30 can be located at the bottom of the battery cell 20, or, if necessary, at the side of the battery cell 20. When the heat exchange plate 30 includes a first plate 31 and a second plate 32, with the first plate 31 being the lower plate and the second plate 32 being the upper plate, the surface of the second plate 32 facing away from the first plate 31 contacts the battery cell 20. The first plate 31 and the second plate 32 can be made of materials with good thermal conductivity, such as aluminum alloy, stainless steel, or copper. The overall outer contour of the first plate 31 and the second plate 32 can be rectangular, elliptical, or other shapes.

[0053] At least one of the first plate 31 and the second plate 32 can be pre-formed by stamping, or at least one of the first plate 31 and the second plate 32 can be pre-formed by extrusion molding or milling. Thus, after the first plate 31 and the second plate 32 are bonded together, they can be connected by welding. The welded flow channel can be a closed shape, thereby forming a closed heat exchange channel between the first plate 31 and the second plate 32, ensuring good sealing and reducing the risk of the heat exchange medium leaking out from the gap between the first plate 31 and the second plate 32. The cross-sectional shape of the heat exchange channel can be semi-circular, circular, or rectangular, and the direction of the heat exchange channel can be straight, L-shaped, U-shaped, S-shaped, or other irregular shapes. After the first plate 31 and the second plate 32 are bonded together, they can be connected by welding, for example, by brazing or laser welding.

[0054] The second plate 32 has a first region and a second region. The first region can be a continuous, uninterrupted whole region or formed by multiple spaced sub-regions. The first region can be a rectangular region, a circular region, or other polygonal regions, etc. The remaining region of the second plate 32 excluding the first region can be defined as the second region. The first region is recessed towards the first plate 31 to form a groove 321. The bottom wall of the groove 321 is closer to the first plate 31 than the surface of the second region facing the first plate 31. Therefore, the bottom wall of the groove 321 can fit against the surface of the first plate 31 facing the second plate 32, meaning that no heat exchange channel is formed between the bottom wall of the groove 321 and the first plate 31. However, there is a gap between the second region of the second plate 32 without the groove 321 and the first plate 31, and this gap can form a heat exchange channel. The groove 321 can be rectangular, elliptical, etc. The battery cell 20 is fully embedded inside the groove 321. The inner wall of the groove 321 is in close contact with the outer wall of the battery cell 20 or has a certain gap. The bottom wall of the groove 321 is in contact with the bottom of the battery cell 20.

[0055] The bottom wall of the groove 321 can be fitted to the surface of the first plate 31 facing the second plate 32. With this arrangement, when the battery cell 20 is placed in the groove 321, the bottom of the battery cell 20 can contact the bottom wall of the groove 321, while the bottom wall of the groove 321 is in contact with the surface of the first plate 31. The heat generated by the battery cell 20 during operation can be transferred sequentially through the bottom wall of the groove 321 and the first plate 31 to the heat exchange medium in the heat exchange channel, where it is carried away by the heat exchange medium. Simultaneously, the fit between the bottom wall of the groove 321 and the first plate 31 also provides support for the bottom wall of the groove 321, reducing the risk of deformation when subjected to pressure from the battery cell 20. This improves the structural strength of the heat exchange plate 30 and its support strength for the battery cell 20.

[0056] A thermally conductive adhesive layer can be provided on the bottom wall of the groove 321, filling the space between the bottom of the battery cell 20 and the bottom wall of the groove 321. The thermally conductive adhesive layer can be made of materials with good thermal conductivity and a certain degree of flexibility, such as thermally conductive silicone grease or thermally conductive pads. Alternatively, the bottom wall of the groove 321 can be welded to the first plate 31 on the side facing it, thereby eliminating the air gap between the bottom wall of the groove 321 and the first plate 31, reducing contact thermal resistance, and allowing the heat generated by the battery cell 20 to be transferred more efficiently to the bottom wall of the groove 321. Since the battery cell 20 is located within the groove 321, the sidewall of the groove 321 can effectively exchange heat with at least the bottom of the battery cell 20. The depth of the groove 321 can be smaller than the height of the battery cell 20, or, if the second plate 32 has good ductility, it can be flush with the height of the battery cell 20. It is understandable that the greater the depth of the groove 321, the better the heat exchange effect and the higher the heat exchange efficiency between the heat exchange medium around the groove 321 and the battery cell 20. The sidewalls of the groove 321 can be enclosed to form a closed cylindrical structure, that is, the entire circumferential sidewall of the battery cell 20 located in the groove 321 can exchange heat with the heat exchange medium; or, considering layout structure or strength issues, some grooves 321 may only include two opposite sidewalls, so that the opposite sidewalls of the battery cell 20 located in the groove 321 can still exchange heat with the heat exchange medium.

[0057] The technical solution of this application arranges the first plate 31 and the second plate 32 of the heat exchange plate 30 in the battery device 100 opposite to each other. The first region of the second plate 32 is recessed towards the first plate 31 to form a groove 321. The battery cell 20 is disposed in the groove 321. A heat exchange channel is formed between the second region of the second plate 32 and the first plate 31. The sidewall of the battery cell 20 can be directly heated by the heat exchange medium in the heat exchange channel between the second region and the first plate 31. The bottom wall of the battery cell 20 can be heated by the heat exchange medium in the heat exchange channel through the bottom wall of the groove 321, and can also be heated by the external environment through the first plate 31. Therefore, the bottom surface and at least part of the sidewall of the battery cell 20 in this application can be heated at the same time, thereby increasing the heat exchange area of ​​the battery cell 20 and improving the heat exchange effect, so that the temperature rise of the battery cell 20 in the high-rate fast charging state is not obvious.

[0058] Furthermore, by placing the battery cell 20 within the groove 321, the sidewalls of the groove 321 can limit the sidewalls of the battery cell 20, thus improving the stability of the battery cell 20 and reducing the risk of it moving arbitrarily. When the battery cell 20 is fixed within the groove 321, only the bottom wall of the groove 321 needs to be coated with adhesive; there is no need to coat the second area of ​​the second plate 32, thereby reducing the amount of adhesive used and lowering material costs. By recessing the second plate 32 in the direction towards the first plate 31 to form the groove 321, the molding process of the groove 321 is simple and the material cost is low. The second area of ​​the second plate 32 without the groove 321, together with the first plate 31, forms a heat exchange channel, allowing the heat exchange medium to flow within the channel. This flow of the heat exchange medium quickly removes heat from the battery cell 20, improving heat exchange efficiency.

[0059] like Figure 4 or Figure 5 As shown, in one embodiment of this application, the groove 321 is elongated and extends along the second direction Y, and is provided with multiple grooves at intervals along the first direction X, with the first direction X and the second direction Y forming an angle; at least a partial heat exchange channel is formed between the area between each two adjacent grooves 321 and the first plate 31.

[0060] The first direction X and the second direction Y can be perpendicular to each other, form an acute angle, or form an obtuse angle. The groove 321 is elongated and extends along the second direction Y. Multiple grooves 321 are spaced apart along the first direction X. The area between each pair of adjacent grooves 321 is part of the second area, thus forming at least a portion of the heat exchange channel between each pair of adjacent grooves 321 and the first plate 31. The elongated groove 321 can be adapted to the shape of the battery cell 20. For example, when the battery cell 20 is cuboid, the groove 321 can also be rectangular. The groove 321 can accommodate the bottom of the battery cell 20, allowing the side of the battery cell 20 to contact the sidewall of the groove 321, thereby increasing the contact area between the battery cell 20 and the heat exchange plate 30. Alternatively, the groove 321 may not be adapted to the shape of the battery cell 20. For example, when the battery cell 20 is cylindrical, the groove 321 can be elliptical or rectangular. Furthermore, each groove 321 extending along the second direction Y can accommodate one battery cell 20, or two or more battery cells 20. There can also be one, two, or more grooves 321 along the second direction Y. When there is one groove 321, its extension range can almost reach the opposite side walls of the second plate 32 along the second direction Y, or penetrate through the opposite side walls of the second plate 32 along the second direction Y, thereby increasing the number of battery cells 20 arranged within the groove 321; alternatively, the size of the groove 321 in the second direction Y can be only about half the size of the second plate 32 in the second direction Y. When there are at least two grooves 321, only one battery cell 20 can be placed in each groove 321, thus increasing the heat exchange surface area of ​​each battery cell 20.

[0061] By arranging multiple grooves 321 at intervals along the first direction X, a heat exchange channel is formed between each pair of adjacent grooves 321. This allows the grooves 321 and heat exchange channels to be arranged alternately along the first direction X. The heat exchange medium within the heat exchange channels can simultaneously remove heat from two adjacent battery cells 20 arranged along the first direction X, thereby improving heat dissipation efficiency. Furthermore, by extending the grooves 321 along the second direction Y, the grooves 321 can accommodate more battery cells 20, allowing more surfaces of more battery cells 20 to simultaneously exchange heat effectively, thus enhancing the heat exchange effect.

[0062] like Figure 4 or Figure 5As shown, in one embodiment of this application, a main liquid inlet 301 is provided on the first plate 31 or the second plate 32, and a main liquid outlet 302 is provided on the first plate 31 or the second plate 32; the heat exchange channel includes a liquid inlet channel 303, a liquid outlet channel 304, and branch channels. The liquid inlet channel 303 is formed between the first plate 31 and the second region and is connected to the main liquid inlet 301; the liquid outlet channel 304 is formed between the first plate 31 and the second region and is connected to the main liquid outlet 302; a branch channel is formed between the region between each pair of adjacent grooves 321 and the first plate 31; the two ends of each branch channel are connected to the liquid inlet channel 303 and the liquid outlet channel 304, respectively.

[0063] The main liquid inlet 301 and the main liquid outlet 302 can both be located on the first plate 31, or both on the second plate 32, or one of the main liquid inlet 301 and the main liquid outlet 302 can be located on the first plate 31 and the other on the second plate 32. When the main liquid inlet 301 and the main liquid outlet 302 are located on the first plate 31, it facilitates the connection between the heat exchange channel and the external heat exchange working fluid circulation pipeline.

[0064] The inlet channel 303 and the outlet channel 304 are formed between the first plate 31 and the second region. A branch channel is formed between the region between each two adjacent grooves 321 and the first plate 31. Each branch channel is connected in parallel between the inlet channel 303 and the outlet channel 304. The inlet channel 303 can be straight, L-shaped or other shapes; the outlet channel 304 can be straight, L-shaped or other shapes. Specifically, a portion of the first plate 31 can protrude towards the second plate 32, and this protrusion can contact a portion of the second region. This protrusion isolates the inlet channel 303 from the outlet channel 304. The inlet channel 303 and the outlet channel 304 are only connected through a branch channel, while the inlet channel is not directly connected to the outlet channel. This allows the heat exchange medium to effectively flow through the branch channel after passing through the inlet channel 303 to the outlet channel 304. The non-protruding area of ​​the first plate 31 can form the inlet channel 303 and the outlet channel 304. Alternatively, the areas of the first plate 31 corresponding to the branch channel, the first region, the inlet channel 303, and the outlet channel 304 are all recessed in the direction away from the second plate 32, while other regions are not recessed. This allows the bottom wall of the groove 321 of the second plate 32 to contact the bottom wall of the corresponding recessed area of ​​the groove 321 on the first plate 31. A gap is formed between the areas of the second plate 32 corresponding to the branch channel, the inlet channel, and the outlet channel and the bottom wall of the corresponding recessed area on the first plate 31 to allow for the flow of the heat exchange medium. Based on the design that the inlet channel 303 must connect to the outlet channel 304 through the branch channel, the area between the end of the first plate 31 where the inlet channel is not connected to the branch channel and the end of the outlet channel is not connected to the branch channel is not recessed. This area is attached to and connected to the corresponding portion of the second region of the second plate 32.

[0065] The inlet channel 303 and the outlet channel 304 can be located at the same end of the branch channel along the second direction Y, or they can be located at opposite ends of the branch channel along the second direction Y. The inlet channel 303 is connected to the main inlet 301, and the outlet channel 304 is connected to the main outlet 302. The two ends of each branch channel are connected to the inlet channel 303 and the outlet channel 304, respectively. In this way, after the heat exchange medium enters the inlet channel 303 from the main inlet 301, it is distributed to each branch channel. When flowing through each branch channel, it absorbs the heat from the battery cell 20, then flows into the outlet channel 304, and finally flows out from the main outlet 302.

[0066] By forming branch channels between the area between each pair of adjacent grooves 321 and the first plate 31, and connecting the two ends of each branch channel to the inlet channel 303 and the outlet channel 304 respectively, multiple branch channels are arranged in parallel, thereby shortening the flow distance and time of the heat exchange medium to each branch channel, reducing the flow resistance, and making the heat exchange medium flow distribution in each branch channel more uniform, which is beneficial to improving the heat exchange uniformity and heat exchange efficiency of the heat exchange plate 30.

[0067] like Figure 4 As shown, in one embodiment of this application, at least a portion of an inlet channel 303 and at least a portion of an outlet channel 304 are formed between the sidewalls at both ends of the groove 321 in the second direction Y and the edge of the second plate 32, respectively.

[0068] In other words, the sidewalls at both ends of the groove 321 are spaced apart from the edge of the second plate 32 in the second direction Y. The groove 321 does not extend to the edge of the second plate 32 in the second direction Y, but leaves space between the two ends of the groove 321 and the edge of the second plate 32. These spaces on both sides form at least a portion of the inlet channel 303 and at least a portion of the outlet channel 304, that is, at least a portion of the inlet channel 303 and at least a portion of the outlet channel 304 are respectively located on opposite sides of the branch channel along the second direction Y. Specifically, the inlet channel 303 can be located on one side of the branch channel along the second direction Y, for example... Figure 4 On the left side of the branch channel, the outlet channel 304 can be located on the other side of the branch channel along the second direction Y, for example... Figure 4 On the right side of the middle.

[0069] With this configuration, the groove 321 has a gap between itself and the edge of the second plate 32 in the second direction Y, which increases the area of ​​direct contact between the groove 321 and the battery cell 20, further improving the heat exchange effect. By forming at least a portion of the inlet channel 303 and at least a portion of the outlet channel 304 between the two ends of the groove 321 and the edge of the second plate 32, the heat exchange medium enters each branch channel from the inlet channel 303, flows through each branch channel in the second direction Y, and then directly enters the outlet channel 304 without turning, thus making the flow of the heat exchange medium smoother, reducing the resistance during the flow of the heat exchange medium, and improving the heat exchange efficiency.

[0070] like Figure 5 As shown, in one embodiment of this application, the groove 321 includes a first sub-groove 3211 and a second sub-groove 3212 spaced apart along the second direction Y; at least a portion of the liquid inlet channel 303 or at least a portion of the liquid outlet channel 304 is formed in the region between the first sub-groove 3211 and the second sub-groove 3212.

[0071] The groove 321 may include a first sub-groove 3211 and a second sub-groove 3212 spaced apart along the second direction Y, with a gap region formed between the first sub-groove 3211 and the second sub-groove 3212, through which the heat exchange medium can flow. At least a portion of the liquid inlet channel 303 or at least a portion of the liquid outlet channel 304 may be formed in the region between the first sub-groove 3211 and the second sub-groove 3212. That is, the liquid inlet channel 303 and / or the liquid outlet channel 304 may pass through the gap region between the first sub-groove 3211 and the second sub-groove 3212, thereby connecting the branch channels located on both sides of the first sub-groove 3211 and the second sub-groove 3212.

[0072] The groove 321 includes a first sub-groove 3211 and a second sub-groove 3212 along the second direction Y. This allows for a relatively small number of battery cells 20 within the first and second sub-grooves 3211 and 3212, thus reducing the risk of poor heat dissipation between adjacent battery cells 20 arranged in the second direction Y. Furthermore, by forming at least a portion of the inlet channel 303 or at least a portion of the outlet channel 304 in the region between the first sub-groove 3211 and the second sub-groove 3212, the heat exchange medium can flow simultaneously from the inlet channel 303 to at least two branch channels in opposite directions along the second direction Y, improving flow efficiency; or it can reduce the efficiency of the flow path from each branch channel to the outlet channel 304. This arrangement improves the uniformity and flow efficiency of the heat exchange medium flow rate in each branch channel, thereby improving the heat exchange uniformity and efficiency of the heat exchange plate 30 for each battery cell 20.

[0073] like Figure 6 As shown, in one embodiment of this application, the distance between two adjacent grooves 321 along the first direction X is set to W, where 3mm≤W≤10mm.

[0074] Along the first direction X, the distance W between two adjacent grooves 321 can be 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, or 10mm, etc. The area between two adjacent grooves 321 forms a branch flow channel with the first plate 31, and this distance determines the width of the branch flow channel. If W is less than 3mm, the width of the branch flow channel is too narrow, the flow resistance of the heat exchange medium in the branch flow channel increases, which is not conducive to the smooth flow of the heat exchange medium. At the same time, the cross-sectional area of ​​the branch flow channel is too small, which will also affect the flow rate and heat dissipation capacity of the heat exchange medium. It also makes the distance between the two battery cells 20 arranged in the first direction too small, which may lead to the risk of face-to-face contact after the battery cells 20 expand, thus affecting the heat dissipation effect of the battery cells 20. If W is greater than 10mm, the width of the branch flow channel is too wide. Although the flow resistance is reduced, the number of battery cells 20 in the grooves 321 will be reduced, which is not conducive to improving the energy density of the battery device 100, and will also cause space waste.

[0075] By setting W to be no less than 3mm and no more than 10mm, the heat exchange medium can flow smoothly and the heat dissipation effect can be ensured, while the structure of the heat exchange plate 30 can be made more compact, which is conducive to improving the energy density of the battery device 100.

[0076] Please refer to the reference. Figures 4 to 6 In one embodiment of this application, the sidewalls of the groove 321 are enclosed to form a closed annular shape.

[0077] The sidewalls of the groove 321 can be closed to form a ring shape. That is, the projection of the groove 321 onto the second plate 32 is a closed ring, such as a rectangular ring, a circular ring, or an elliptical ring. The projection of the sidewall of the groove 321 onto the surface of the second plate 32 may or may not coincide with the edge of the second plate 32. When the projection of the sidewall of the groove 321 onto the surface of the second plate 32 coincides with the edge of the second plate 32, The sidewalls of the groove 321 form a closed annular shape, creating a recessed space within the groove 321. When the battery cell 20 is placed within this recessed space, its bottom and sides can contact the sidewalls and bottom wall of the groove 321, further increasing the contact area between the battery cell 20 and the heat exchange plate 30, which is beneficial for further improving heat dissipation efficiency. Simultaneously, the closed annular shape of the sidewalls of the groove 321 provides good positioning and limiting for the battery cell 20 placed within it, reducing the risk of horizontal displacement and improving the assembly stability and reliability of the battery assembly 100.

[0078] Please refer to the reference. Figures 4 to 6In one embodiment of this application, the sidewall of the groove 321 is projected onto the second plate 32 and does not coincide with the edge of the second plate 32.

[0079] The sidewall of the groove 321 is projected onto the second plate 32 and does not coincide with the edge of the second plate 32. That is, the groove 321 is located inside the second plate 32 as a whole, and each edge of the bottom wall of the groove 321 has a gap between it and the corresponding edge of the second plate 32.

[0080] This arrangement creates a certain distance between the sidewall of the groove 321 and the edge of the second plate 32. This distance can be used to form a flow channel structure for the heat exchange medium to flow; or the area between the sidewall of the groove 321 and the edge of the second plate 32 can be directly used as a connection area, thereby improving the connection strength and providing good sealing for the heat exchange channel, reducing the risk of the heat exchange medium leaking from the edge of the heat exchange plate 30.

[0081] In one embodiment of this application, at least two battery cells 20 are provided, and a heat insulation layer is provided between at least two adjacent battery cells 20.

[0082] At least two battery cells 20 may be arranged along a first direction X, or at least two along a second direction Y. A heat insulation layer is provided between every two adjacent battery cells 20 arranged along the first direction X, and / or between every two adjacent battery cells 20 arranged along the second direction Y. The heat insulation layer may be made of a material with good heat insulation performance, such as aerogel felt, glass fiber cotton, ceramic fiber paper, etc. During the operation of the battery device 100, there may be temperature differences between different battery cells 20. The heat generated by one battery cell 20 may be transferred to adjacent battery cells 20 through heat conduction, causing the temperature of adjacent battery cells 20 to rise, affecting the overall temperature uniformity and service life of the battery device 100.

[0083] By setting a heat insulation layer between adjacent battery cells 20, the lateral transfer of heat between adjacent battery cells 20 can be effectively blocked, reducing the risk of thermal crosstalk. This allows the heat from each battery cell 20 to be mainly dissipated through the heat exchange plate 30, thereby improving the temperature uniformity and heat dissipation efficiency of the battery device 100. At the same time, the heat insulation layer also acts as a buffer, absorbing the dimensional changes of the battery cells 20 due to thermal expansion during use, reducing the risk of direct compression and collision between the battery cells 20.

[0084] like Figure 6 As shown, in one embodiment of this application, the ratio of the depth dimension of the groove 321 to the thickness dimension of the second plate 32 is not less than 2 and not greater than 4.

[0085] The depth dimension of the groove 321 is defined as H, and the thickness dimension of the second plate 32 is defined as T. H / T can be set to be no less than 2 and no more than 4. That is, 2≤H / T≤4. The thickness dimension T of the second plate 32 refers to the thickness of the second plate 32 in the non-recessed area (i.e., the second region). The depth dimension H of the groove 321 refers to the depth by which the bottom wall of the groove 321 is recessed downward relative to the surface of the second region of the second plate 32. If H / T is less than 2, the depth of the groove 321 is shallow. When the battery cell 20 is placed in the groove 321, the contact area between the side of the battery cell 20 and the side wall of the groove 321 is small, which is not conducive to sufficient heat dissipation of the battery cell 20; at the same time, the positioning effect of the groove 321 on the battery cell 20 is also weak, which is not conducive to the stable positioning effect of the battery cell 20. If H / T is greater than 4, the groove 321 is too deep, which can easily cause the local material of the second plate 32 to become excessively thin or even crack during stamping, affecting the structural strength and sealing performance of the heat exchange plate 30. At the same time, an excessively deep groove 321 will also increase the stamping difficulty and cost of the second plate 32.

[0086] By ensuring that the ratio of the depth dimension of the groove 321 to the thickness dimension of the second plate 32 is not less than 2 and not greater than 4, the groove 321 can have sufficient depth to accommodate the battery cell 20, thereby providing a larger sidewall contact area and improving the heat exchange effect and efficiency. In addition, it can also ensure that the second plate 32 has sufficient structural strength and good stamping performance, which is beneficial to improve the strength of the heat exchange plate 30 while achieving good heat exchange.

[0087] like Figure 7 As shown, in one embodiment of this application, the battery device 100 includes a box body 11 and a box cover 12. A heat exchange plate 30 forms the bottom plate of the box body 11 and is disposed opposite to the box cover 12. The box body 11 and the box cover 12 together enclose a cavity, and the battery cell 20 is disposed in the cavity.

[0088] The box body 11 refers to a component that has an opening and at least a partial accommodating space. The box body 11 includes a bottom plate and side plates, the side plates being connected to the bottom plate and enclosing it to form a cylindrical shape, such as a cylindrical or cuboid shape.

[0089] The lid 12 is a component that covers the opening of the box body 11. The lid 12 can be flat or it can be a component with a certain amount of space.

[0090] By forming the heat exchange plate 30 as the bottom plate of the housing body 11, the volume occupied by the heat exchange plate 30 within the cavity jointly enclosed by the housing body 11 and the housing cover 12 can be reduced. This allows for the placement of more battery cells 20 within the cavity, increasing battery capacity. Furthermore, this design reduces material costs and enables the heat generated by the battery cells 20 during operation to be dissipated outside the battery assembly 100 more quickly, resulting in better heat dissipation.

[0091] This application also proposes an electrical appliance. For example... Figure 1 As shown, the electrical device includes a battery device 100. The specific structure of the battery device 100 is as described in the above embodiments. Since this electrical device adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be repeated here. Specifically, the electrical device can be any of the aforementioned devices or systems that use the battery device 100.

[0092] The above are merely exemplary embodiments of this application and do not limit the patent scope of this application. Any equivalent structural transformations made based on the technical concept of this application and the contents of the specification and drawings of this application, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this application.

Claims

1. A battery device, characterized in that, Includes a battery cell and a heat exchange plate; the heat exchange plate includes: First plate; and The second plate is disposed opposite to the first plate. The second plate has a first region and a second region. The first region is recessed in the direction of the first plate. The battery cell is disposed in the recess. The bottom wall of the recess is fitted to the surface of the first plate facing the second plate. A heat exchange channel is formed between the second region and the first plate. The first plate and the second plate are connected and seal the heat exchange channel.

2. The battery device as claimed in claim 1, characterized in that, The groove is elongated and extends along the second direction, and is provided at intervals along the first direction, with the first direction and the second direction forming an angle; the area between each two adjacent grooves forms at least part of the heat exchange channel with the first plate.

3. The battery device as claimed in claim 2, characterized in that, A main liquid inlet is provided on the first plate or the second plate, and a main liquid outlet is provided on the first plate or the second plate; the heat exchange channel includes: A liquid inlet channel is formed between the first plate and the second region and is connected to the main liquid inlet. A liquid outlet channel, formed between the first plate and the second region, and connected to the main liquid outlet; and The branch flow channel is formed between the area between each two adjacent grooves and the first plate; the two ends of each branch flow channel are respectively connected to the inlet flow channel and the outlet flow channel.

4. The battery device as claimed in claim 3, characterized in that, At least a portion of the inlet channel and at least a portion of the outlet channel are formed between the sidewalls at both ends of the groove and the edge of the second plate, respectively.

5. The battery device as claimed in claim 3, characterized in that, The groove includes a first sub-groove and a second sub-groove spaced apart along a second direction; at least a portion of the liquid inlet channel or at least a portion of the liquid outlet channel is formed in the region between the first sub-groove and the second sub-groove.

6. The battery device as claimed in claim 2, characterized in that, Along the first direction, the distance between two adjacent grooves is set to W, where 3mm ≤ W ≤ 10mm.

7. The battery device according to any one of claims 1 to 6, characterized in that, The sidewalls of the groove form a closed annular shape.

8. The battery device as claimed in claim 7, characterized in that, The sidewall of the groove does not coincide with the edge of the second plate when projected onto the second plate.

9. The battery device according to any one of claims 1 to 6, characterized in that, The battery cell is provided in at least two parts, and a heat insulation layer is provided between at least two adjacent battery cells; And / or, the ratio of the depth dimension of the groove to the thickness dimension of the second plate is not less than 2 and not greater than 4; And / or, the battery device includes a box body and a box cover, the heat exchange plate forms the bottom plate of the box body, and the heat exchange plate is disposed opposite to the box cover; the box body and the box cover together enclose a cavity, and the battery cell is disposed in the cavity.

10. An electrical appliance, characterized in that, Includes the battery device as described in any one of claims 1 to 9.

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