Battery device, heat exchange plate and electric appliance

Abstract

The application discloses a battery device, a heat exchange plate and an electric equipment, and relates to the technical field of battery devices. The battery device comprises a battery monomer and a heat exchange plate. At least one side of the battery monomer is attached to the heat exchange plate. The heat exchange plate comprises a first plate body and a second plate body. The first plate body and the second plate body are oppositely arranged and connected. A heat exchange flow channel and a first welding channel are formed between the first plate body and the second plate body. At least part of the first welding channel is arranged around the edge of the heat exchange flow channel. The distance between the first welding channel and the root of the flow channel is not greater than 5 mm. The technical scheme can improve the problem that the flow channel of the heat exchange plate of the battery device is prone to deformation.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery device, heat exchange plate, and electrical equipment. Background Technology

[0002] When the two opposing heat exchange plates of a battery device are laser-welded, a laser weld bead is formed. However, in related technologies, the laser weld bead is too far from the root of the flow channel, and the increased distance between the weld bead on both sides of the flow channel will lead to a decrease in the pressure resistance of the cold plate flow channel and a risk of deformation of the flow channel. At the same time, there is a wide gap between the weld bead and the flow channel, and the heat exchange working fluid is prone to accumulate in this gap, which will cause corrosion of the heat exchange plate or the weld bead. Utility Model Content

[0003] The main purpose of this application is to provide a battery device, heat exchange plate, and electrical equipment, which aims to improve the problem of easy deformation of the heat exchange plate flow channel in the battery device.

[0004] To achieve the above objectives, the battery device proposed in this application includes a battery cell and a heat exchange plate, wherein at least one side of the battery cell is attached to the heat exchange plate; the heat exchange plate includes a first plate body and a second plate body, the first plate body and the second plate body are disposed opposite to each other and connected, a heat exchange channel and a first weld bead are formed between the first plate body and the second plate body, at least a portion of the first weld bead is disposed around the edge of the heat exchange channel, and the distance between the first weld bead and the root of the heat exchange channel is L, where L is not greater than 5mm.

[0005] The technical solution of this application involves attaching at least one side of a battery cell to a heat exchange plate, which allows the heat exchange plate to dissipate heat from the battery cell, thereby reducing its temperature and mitigating the risk of thermal runaway. By arranging and connecting the first and second plates of the heat exchange plate opposite to each other, a heat exchange channel is formed between them. This channel allows for the flow of a heat exchange medium, which in turn better dissipates heat from the battery cell during the flow of the heat exchange medium.

[0006] A first weld bead is formed between the first and second plates. This first weld bead is positioned no more than 5mm from the root of the heat exchange channel. This reduces the distance between the sides of the heat exchange channel and the weld bead, thereby improving the pressure resistance of the heat exchange plate and reducing the risk of channel deformation. Simultaneously, the reduced distance between the weld bead and the channel decreases the gap between them, making it less likely for the heat exchange medium to accumulate in this gap, thus reducing the possibility of corrosion of the heat exchange plate or weld bead by the heat exchange medium. Furthermore, this arrangement allows the heat exchange channel to be widened as close to the first weld bead as possible while maintaining its position, increasing the width of the heat exchange channel and thus increasing the heat dissipation area for the battery cells, achieving better heat dissipation.

[0007] In one embodiment of this application, L is no greater than 3 mm.

[0008] This design can further reduce the distance between the first weld bead and the root of the heat exchange channel, thereby further improving the pressure resistance of the heat exchange channel and reducing the risk of channel deformation; it can also further reduce the gap between the weld bead and the channel, reducing the risk of heat exchange medium accumulation and corrosion of the first plate, the second plate, and the first weld bead; in addition, it can further widen the width of the heat exchange channel, increase the heat dissipation area, and improve heat dissipation efficiency.

[0009] In one embodiment of this application, the heat exchange channel includes a first channel and a second channel arranged opposite to each other, the arrangement direction of the first channel and the second channel is at an angle to the extension direction of the first channel; one end of the first channel is connected to one end of the second channel, and the end of the first channel away from the second channel and the end of the second channel away from the first channel form an opening; the first weld bead includes a peripheral weld bead and a first inner weld bead, the peripheral weld bead is arranged around the outer contour of the heat exchange channel and avoids the area between the first channel and the second channel; the first inner weld bead includes a first linear weld bead, and the first linear weld bead is located between the first channel and the second channel, and the distance from the first linear weld bead to the root of the first channel and the root of the second channel is not greater than 5mm.

[0010] By including a first flow channel and a second flow channel arranged opposite each other, with the arrangement direction of the first flow channel and the extension direction of the second flow channel forming an angle, at least part of the heat exchange channel has a meandering structure, thereby increasing the heat dissipation area and improving the heat dissipation efficiency within a limited space.

[0011] By including an outer weld bead and a first inner weld bead, with the outer weld bead surrounding the outer contour of the heat exchange flow channel and avoiding the area between the first flow channel and the second flow channel, and the first inner flow channel including a first linear weld bead, the distance from the first linear weld bead to the root of the first flow channel and the root of the second flow channel is not greater than 5mm, the first flow channel and the second flow channel share the first linear weld bead. Thus, while ensuring that both the first flow channel and the second flow channel can be strengthened by the first linear weld bead, the total length of the first inner weld bead can also be reduced, thereby reducing the total length of the first weld bead.

[0012] Furthermore, this design reduces the risk of the first weld bead being located on the wall of either the first or second flow channel due to the small distance between them. By setting the first linear weld bead, the width of both the first and second flow channels can be increased, minimizing the distance between them and thus increasing the heat dissipation area and improving heat dissipation efficiency.

[0013] In one embodiment of this application, the end of the first linear weld bead near the opening intersects with the peripheral weld bead.

[0014] This configuration reduces the risk of stress concentration at the end of the first linear weld bead near the opening, allowing some of the stress to be distributed to the outer weld bead, thereby increasing the strength of the first linear weld bead.

[0015] In one embodiment of this application, the end of the first linear weld bead near the opening extends beyond the area enclosed by the outer weld bead.

[0016] This configuration reduces the risk that the end of the first linear weld bead may not be able to effectively intersect with the outer weld bead due to the reduced power of the laser welding equipment during laser welding. This ensures a reliable overlap or lap effect between the first linear weld bead and the outer weld bead, further improving the connection strength and sealing at the weld bead junction.

[0017] In one embodiment of this application, the first inner weld bead further includes a first circular arc weld bead, which is connected to the end of the first linear weld bead away from the opening.

[0018] This configuration reduces the risk of stress concentration at the end of the first linear weld bead furthest from the opening, thereby improving the fatigue resistance of the first inner weld bead.

[0019] In one embodiment of this application, one end of the first arc weld bead is connected to the end of the first linear weld bead away from the opening, and the other end is arranged to intersect with the first linear weld bead.

[0020] This configuration allows for a stronger connection between the first circular arc weld bead and the first linear weld bead, reducing defects such as incomplete fusion or cracks at the ends of the first linear weld bead.

[0021] In one embodiment of this application, the heat exchange channel includes a third channel and a fourth channel arranged opposite to each other, the third channel and the fourth channel are arranged in parallel, and the arrangement direction of the third channel and the fourth channel is at an angle to the extension direction of the third channel; and the two ends of the third channel are respectively connected to the two ends of the fourth channel; the first weld bead includes a peripheral weld bead and a second inner weld bead, the peripheral weld bead is arranged around the outer contour of the heat exchange channel and avoids the area between the third channel and the fourth channel; the second inner weld bead includes a second linear weld bead, and the second linear weld bead is located between the third channel and the fourth channel and is isolated from the peripheral weld bead, and the distance from the second linear weld bead to the root of the third channel and the root of the fourth channel is not greater than 5mm.

[0022] This configuration allows the third and fourth flow channels to share the second linear weld bead. This ensures that both channels are strengthened by the second linear weld bead to improve pressure resistance, while also reducing the overall length of the second inner weld bead, and consequently, the overall length of the first weld bead. Furthermore, this configuration reduces the risk of the second inner weld bead being located on the flow wall of either the third or fourth flow channel due to the small distance between them. By using the second linear weld bead, the width of the third and fourth flow channels can also be increased, minimizing the distance between them and thus increasing the heat dissipation area and improving heat dissipation efficiency.

[0023] In one embodiment of this application, the second inner weld bead further includes a second circular arc weld bead, which is connected to the end of the second linear weld bead.

[0024] This configuration reduces the risk of stress concentration at the ends of the second linear weld bead.

[0025] In one embodiment of this application, one end of the second arc weld bead is connected to the end of the second linear weld bead, and the other end is intersected with the second linear weld bead.

[0026] This configuration allows for a more robust connection between the second circular arc weld bead and the second linear weld bead, reducing the risk of incomplete fusion or cracks at the ends of the second linear weld bead.

[0027] In one embodiment of this application, a second weld bead is formed between the first plate and the second plate, the second weld bead is disposed around the outside of the first weld bead, and the second weld bead welds the edges of the first plate and the edges of the second plate.

[0028] This design reduces the risk of condensate accumulating between the first and second plates, thereby reducing the risk of condensate corrosion of the first and second welds and improving the overall sealing and structural strength of the heat exchange plate.

[0029] This application also proposes a heat exchange plate for use in a battery device. The heat exchange plate includes a first plate and a second plate. The first plate and the second plate are disposed opposite to each other and connected. A heat exchange channel and a first weld bead are formed between the first plate and the second plate. At least a portion of the first weld bead is disposed around the edge of the heat exchange channel, and the distance between the first weld bead and the root of the channel is not greater than 5 mm.

[0030] By arranging and connecting the first and second plates of the heat exchange plate opposite to each other, a heat exchange channel is formed between the first and second plates. The heat exchange medium can flow within the heat exchange channel, thereby improving heat dissipation for the battery cells during the flow of the heat exchange medium. A first weld bead is also formed between the first and second plates. This first weld bead is located no more than 5mm from the root of the heat exchange channel, which reduces the distance between the sides of the heat exchange channel and the weld bead, thereby improving the pressure resistance of the heat exchange plate's channel and reducing the risk of channel deformation. Simultaneously, the reduced distance between the weld bead and the channel decreases the gap between them, making it less likely for the heat exchange medium to accumulate in this gap, thus reducing the possibility of corrosion of the heat exchange plate or weld bead by the heat exchange medium.

[0031] In addition, this configuration allows the heat exchange channel to be widened as much as possible in the direction close to the first weld bead while keeping the position of the first weld bead unchanged. This increases the width of the heat exchange channel and thus increases the heat dissipation area of ​​the battery cell, achieving a better heat dissipation effect.

[0032] This application also proposes an electrical device including the aforementioned battery device. Attached Figure Description

[0033] 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.

[0034] Figure 1 This is a schematic diagram of the vehicle structure according to some embodiments of this application; Figure 2 This is an exploded view 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 a cross-sectional view of a heat exchange plate in a battery device according to some embodiments of this application; Figure 5 This is a top view of the second plate of the heat exchange plate in some embodiments of the battery device of this application; Figure 6 for Figure 5 A magnified view of a section at point A in the middle; Figure 7 for Figure 5 A partial structural diagram; Figure 8 for Figure 7 A magnified view of a section at point B in the middle; Figure 9 for Figure 7 A magnified view of a section at point C; Figure 10 for Figure 7 A magnified view of a section at point D.

[0035] Explanation of icon numbers: 1000, vehicles; 100. Battery assembly; 200. Controller; 300. Motor; 10. Box body; 20. Battery cell; 21. End cap; 21a. Electrode terminal; 22. Housing; 23. Electrode assembly; 23a. Tab; 30. Heat exchange plate; 31. First plate; 32. Second plate; 301. Heat exchange flow channel; 3011. First flow channel; 3012. Second flow channel; 3013. Third flow channel; 3014. Fourth flow channel; 302. First weld bead; 3021. Outer weld bead; 3022. First inner weld bead; 3022a. First linear weld bead; 3022b. First circular arc weld bead; 3023. Second inner weld bead; 3023a. Second linear weld bead; 3023b. Second circular arc weld bead; 303. Second weld bead.

[0036] 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

[0037] 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.

[0038] 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.

[0039] 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.

[0040] 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.

[0041] 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.

[0042] 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.

[0043] Please refer to Figure 1 , Figure 1This 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.

[0044] 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.

[0045] Please refer to Figure 2 The 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.

[0046] 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.

[0047] 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.

[0048] 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.

[0049] 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.

[0050] 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.

[0051] 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.

[0052] When the two opposing plates of the heat exchange plate 30 of the battery device 100 are laser welded, a laser weld bead is formed. However, in related technologies, the laser weld bead is too far from the root of the flow channel, and the distance between the weld beads on both sides of the flow channel increases, which will lead to a decrease in the pressure resistance of the cold plate flow channel and a risk of deformation of the flow channel. At the same time, there is a wide gap between the weld bead and the flow channel between the two opposing plates. The heat exchange working fluid is easy to accumulate in this gap, which will cause corrosion of the heat exchange plate 30 or the weld bead.

[0053] To address the issue of easy deformation of the flow channel in the heat exchange plate 30 of the battery device 100, please refer to the following: Figures 4 to 6This application proposes a battery device 100, which includes a battery cell 20 and a heat exchange plate 30. At least one side of the battery cell 20 is attached to the heat exchange plate 30. The heat exchange plate 30 includes a first plate body 31 and a second plate body 32. The first plate body 31 and the second plate body 32 are disposed opposite to each other and connected. A heat exchange channel 301 and a first weld bead 302 are formed between the first plate body 31 and the second plate body 32. At least a portion of the first weld bead 302 is disposed around the edge of the heat exchange channel 301, and the distance between the first weld bead 302 and the root of the heat exchange channel 301 is L, where L is not greater than 5 mm.

[0054] 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 is located at the bottom of the battery cell 20, one of the first plate 31 and the second plate 32 can serve as the upper plate, and the other as the lower plate. For example, the first plate 31 can be the upper plate, and the second plate 32 can be the lower plate, in which case the first plate 31 is in contact with the battery cell 20; or the first plate 31 can be the lower plate, and the second plate 32 can be the upper plate, in which case the second plate 32 is in contact with 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.

[0055] 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, so that when the first plate 31 and the second plate 32 are attached to each other, a closed heat exchange channel 301 is formed between them. The cross-sectional shape of the heat exchange channel 301 can be semi-circular, circular or rectangular, etc., and the orientation shape of the heat exchange channel 301 can be straight, L-shaped, U-shaped, S-shaped or other irregular shapes.

[0056] The root of the flow channel refers to the bend where the sidewall of the flow channel transitions to the plane of the plate with the corresponding flow channel. A heat exchange medium flows inside the flow channel. The heat exchange medium can be a liquid medium such as water or an aqueous solution of ethylene glycol, so as to provide uniform temperature dissipation for the battery cells 20 attached to the heat exchange plate 30.

[0057] In this application, the first plate 31 and the second plate 32 are welded together using laser welding. Laser welding offers advantages such as good formability, resistance to heat exchange medium corrosion, and lightweight design. Laser welding achieves a metallurgical seal between the two plates, with the laser's trajectory forming a weld bead between the first plate 31 and the second plate 32. In this application, the first weld bead 302 is arranged around the contour of the heat exchange channel 301. The distance between the first weld bead 302 and the root of the heat exchange channel 301 specifically refers to the perpendicular distance from the fusion centerline of the first weld bead 302 to the centerline of the root of the heat exchange channel 301.

[0058] By defining the distance between the first weld bead 302 and the root of the heat exchange channel 301 as L, and L≤5mm, the first weld bead 302 is made closer to the heat exchange channel 301, thus providing stronger support and constraint for the root of the heat exchange channel 301 and reducing the risk of deformation of the heat exchange channel 301. Specifically, the distance L between the first weld bead 302 and the root of the heat exchange channel 301 can be 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, etc.

[0059] The technical solution of this application involves attaching at least one side of the battery cell 20 to the heat exchange plate 30, thereby enabling the heat exchange plate 30 to dissipate heat from the battery cell 20, reducing its temperature and thus mitigating the risk of thermal runaway. By arranging and connecting the first plate 31 and the second plate 32 of the heat exchange plate 30 opposite to each other, a heat exchange channel 301 is formed between the first plate 31 and the second plate 32. This heat exchange channel 301 allows for the flow of a heat exchange medium, thereby improving heat dissipation from the battery cell 20 during the flow of the heat exchange medium.

[0060] A first weld bead 302 is formed between the first plate 31 and the second plate 32. The first weld bead 302 is positioned no more than 5 mm from the root of the heat exchange channel 301. This reduces the distance between the sides of the heat exchange channel 301 and the weld bead, thereby improving the pressure resistance of the heat exchange plate 30 and reducing the risk of channel deformation. Simultaneously, the reduced distance between the weld bead and the channel decreases the gap between them, making it less likely for the heat exchange medium to accumulate in this gap, thus reducing the possibility of corrosion of the heat exchange plate 30 or the weld bead by the heat exchange medium. Furthermore, this arrangement allows the heat exchange channel 301 to be widened as much as possible towards the first weld bead 302 while maintaining the position of the first weld bead 302, thereby increasing the width of the heat exchange channel 301 and increasing the heat dissipation area of ​​the battery cell 20, achieving a better heat dissipation effect.

[0061] In one embodiment of this application, L may be no greater than 3 mm.

[0062] This configuration further reduces the distance between the first weld bead 302 and the root of the heat exchange channel 301, thereby further improving the pressure resistance of the heat exchange channel 301 and reducing the risk of channel deformation. It also further reduces the gap between the weld bead and the channel, reducing the risk of heat exchange medium accumulation and corrosion of the first plate 31, the second plate 32, and the first weld bead 302. In addition, it can further widen the width of the heat exchange channel 301, increase the heat dissipation area, and improve heat dissipation efficiency.

[0063] like Figure 7 As shown, in one embodiment of this application, the heat exchange channel 301 includes a first channel 3011 and a second channel 3012 disposed opposite to each other. The arrangement direction of the first channel 3011 and the second channel 3012 is set at an angle to the extension direction of the first channel 3011. One end of the first channel 3011 is connected to one end of the second channel 3012, and the end of the first channel 3011 away from the second channel 3012 and the end of the second channel 3012 away from the first channel 3011 form an opening. The first weld bead 302 includes a peripheral weld bead 3021 and a first inner weld bead 3022. The peripheral weld bead 3021 is arranged around the outer contour of the heat exchange channel 301 and avoids the area between the first channel 3011 and the second channel 3012. The first inner weld bead 3022 includes a first linear weld bead 3022a, and the first linear weld bead 3022a is located between the first channel 3011 and the second channel 3012. The distance from the first linear weld bead 3022a to the root of the first channel 3011 and the root of the second channel 3012 is not greater than 5 mm.

[0064] One end of the first flow channel 3011 is connected to one end of the second flow channel 3012, and the first flow channel 3011 and the second flow channel 3012 are arranged opposite to each other. The arrangement direction of the first flow channel 3011 and the second flow channel 3012 is set at an angle to the extension direction of the first flow channel 3011. Therefore, the flow direction of the heat exchange medium in the first flow channel 3011 and the second flow channel 3012 is opposite. The first flow channel 3011 can be parallel to the second flow channel 3012 or set at an acute angle, that is, the first flow channel 3011 and the second flow channel 3012 are roughly U-shaped after being connected. The end of the first flow channel 3011 away from the second flow channel 3012 and the end of the second flow channel 3012 away from the first flow channel 3011 form an opening, so a certain gap is formed between the first flow channel 3011 and the second flow channel 3012. This gap connects to the opening, and the first flow channel 3011 and the second flow channel 3012 are connected in series.

[0065] The heat exchange channel 301 may consist only of a first channel 3011 and a second channel 3012 connected in series. The heat exchange channel 301 has an inlet and an outlet communicating with the outside. The end of the first channel 3011 not connected to the second channel 3012 can serve as the inlet, and the end of the second channel 3012 not connected to the first channel 3011 can serve as the outlet. Alternatively, if necessary, the heat exchange channel 301 may include other channels in addition to the first channel 3011 and the second channel 3012, such as an inlet channel and an outlet channel, with the first channel 3011 and the second channel 3012 connected in series between the inlet channel and the outlet channel.

[0066] For a heat exchange channel 301 with a meandering shape, the gap between two opposing channels may be small, making it impossible for the weld bead to perfectly fit the channel shape in a single molding process; or, to reduce the total length of the first weld bead 302, it needs to be formed in sections. In this application, the first weld bead 302 includes an outer weld bead 3021 and a first inner weld bead 3022. The outer weld bead 3021 refers to the weld bead surrounding the outermost edge of the heat exchange channel 301 within the first weld bead 302, and this outer weld bead 3021 does not extend into the gap between the first channel 3011 and the second channel 3012. The distance between the outer weld bead 3021 and the root of the outermost edge of the heat exchange channel 301 is no greater than 5 mm.

[0067] The first inner weld bead 3022 refers to a weld bead at least partially located within the outer weld bead 3021 and situated in the gap between the first flow channel 3011 and the second flow channel 3012. The first inner weld bead 3022 includes a first linear weld bead 3022a, and the distance from the first linear weld bead 3022a to the root of both the first flow channel 3011 and the root of the second flow channel 3012 is no greater than 5 mm. Therefore, the first flow channel 3011 and the second flow channel 3012 share the first linear weld bead 3022a, thereby reducing the length of the first inner weld bead 3022 and consequently reducing the length of the first weld bead 302. In other words, the first inner weld bead 3022 is no longer a closed annular structure; it is independent of the outer weld bead 3021. The first linear weld bead 3022a can be straight, broken, or curved, i.e., a structure with two endpoints, rather than a closed annular structure.

[0068] By including a first channel 3011 and a second channel 3012 arranged opposite to each other in the heat exchange channel 301, and the arrangement direction of the first channel 3011 and the second channel 3012 is set at an angle to the extension direction of the first channel 3011, at least part of the heat exchange channel 301 has a meandering structure, thereby increasing the heat dissipation area and improving the heat dissipation efficiency in a limited space. By including an outer weld 3021 and a first inner weld 3022 in the first weld bead 3022, with the outer weld 3021 surrounding the outer contour of the heat exchange channel 301 and avoiding the area between the first channel 3011 and the second channel 3012, and the first inner channel including a first linear weld 3022a, the distance from the first linear weld 3022a to the root of the first channel 3011 and the root of the second channel 3012 is not greater than 5mm, thus enabling the first channel 3011 and the second channel 3012 to share the first linear weld 3022a. This ensures that both the first channel 3011 and the second channel 3012 can be strengthened by the first linear weld 3022a, while also reducing the total length of the first inner weld 3022, thereby reducing the total length of the first weld 302. Furthermore, this arrangement reduces the risk that at least a portion of the double-layer weld bead might fall onto the flow wall of the first flow channel 3011 or the flow wall of the second flow channel 3012 when a double-layer weld bead is installed due to the small distance between the first flow channel 3011 and the second flow channel 3012. By setting the first linear weld bead 3022a, the first flow channel 3011 and the second flow channel 3012 share the same weld bead (i.e., the first linear weld bead 3022a), thereby reducing the width of the shared weld bead and thus widening the width of the first flow channel 3011 and the second flow channel 3012. This minimizes the distance between the first flow channel 3011 and the second flow channel 3012, thereby increasing the heat dissipation area and improving heat dissipation efficiency.

[0069] Please refer to the reference. Figure 7 and Figure 8 In one embodiment of this application, the first linear weld bead 3022a intersects with the outer weld bead 3021 at one end near the opening.

[0070] The first linear weld bead 3022a intersects the outer weld bead 3021 at one end near the opening, meaning that one end of the first linear weld bead 3022a can directly coincide with the outer weld bead 3021, or the first linear weld bead 3022a at one end near the opening can directly intersect the outer weld bead 3021, so that the first linear weld bead 3022a at one end near the opening extends beyond the area enclosed by the outer weld bead 3021.

[0071] During the flow of the heat exchange medium, the heat exchange medium may exert an expansion force on the first plate 31 and the second plate 32. By intersecting the first linear weld bead 3022a near the opening with the outer weld bead 3021, the risk of stress concentration at the opening end of the first linear weld bead 3022a can be reduced. Some of the stress here can be dispersed to the outer weld bead 3021, thereby improving the strength of the first linear weld bead 3022a.

[0072] Please refer to the reference. Figure 7 and Figure 8 In one embodiment of this application, the first linear weld bead 3022a extends beyond the area enclosed by the outer weld bead 3021 at one end near the opening.

[0073] This configuration reduces the risk that the end of the first linear weld bead 3022a may not be able to effectively intersect with the outer weld bead 3021 due to the reduced power of the laser welding equipment during laser welding. This ensures a reliable overlap or lap joint between the first linear weld bead 3022a and the outer weld bead 3021, further improving the connection strength and sealing at the weld bead intersection.

[0074] Please refer to the reference. Figure 7 and Figure 9 In one embodiment of this application, the first inner weld bead 3022 further includes a first arc weld bead 3022b, which is connected to the end of the first linear weld bead 3022a away from the opening.

[0075] The first circular arc weld bead 3022b is a circular, arc-shaped, or spiral weld bead. When the first circular arc weld bead 3022b is connected to the end of the first linear weld bead 3022a away from the opening, the other end of the first circular arc weld bead 3022b may or may not intersect with the first linear weld bead 3022a.

[0076] By connecting the first circular arc weld bead 3022b to the end of the first linear weld bead 3022a away from the opening, the risk of stress concentration at the end of the first linear weld bead 3022a away from the opening can be reduced, thereby improving the fatigue resistance of the first inner weld bead 3022.

[0077] Please refer to the reference. Figure 7 and Figure 9 In one embodiment of this application, one end of the first arc weld bead 3022b is connected to the end of the first linear weld bead 3022a away from the opening, and the other end is arranged to intersect with the first linear weld bead 3022a.

[0078] By intersecting the other end of the first circular arc weld bead 3022b with the first linear weld bead 3022a, a more robust connection structure can be formed between the first circular arc weld bead 3022b and the first linear weld bead 3022a, reducing defects such as incomplete fusion or cracks at the end of the first linear weld bead 3022a, and further improving the reliability of the first linear weld bead 3022a.

[0079] Please refer to the reference. Figure 7 and Figure 10 In one embodiment of this application, the heat exchange channel 301 includes a third channel 3013 and a fourth channel 3014 arranged opposite to each other. The third channel 3013 and the fourth channel 3014 are arranged in parallel, and the arrangement direction of the third channel 3013 and the fourth channel 3014 is at an angle to the extension direction of the third channel 3013. The two ends of the third channel 3013 are respectively connected to the two ends of the fourth channel 3014. The first weld bead 302 includes a peripheral weld bead 3021 and a second inner weld bead 3023. The peripheral weld bead 3021 is arranged around the outer contour of the heat exchange channel 301 and avoids the area between the third channel 3013 and the fourth channel 3014. The second inner weld bead 3023 includes a second linear weld bead 3023a, which is located between the third channel 3013 and the fourth channel 3014 and is isolated from the peripheral weld bead 3021. The distance from the second linear weld bead 3023a to the root of the first channel 3011 and the root of the second channel 3012 is not greater than 5 mm.

[0080] The third flow channel 3013 and the fourth flow channel 3014 are arranged in parallel and opposite to each other, with their arrangement directions forming an angle with the extension direction of the third flow channel 3013. Both ends of the third flow channel 3013 are connected to both ends of the fourth flow channel 3014, forming a U-shaped structure. The flow direction of the heat exchange medium in the third flow channel 3013 is the same as that in the fourth flow channel 3014. Therefore, the area between the third flow channel 3013 and the fourth flow channel 3014 forms an independent island region. The weld beads formed in this region and the weld beads surrounding the outer contour of the entire heat exchange flow channel 301 need to be formed independently; these two cannot be formed continuously.

[0081] The heat exchange channel 301 may consist only of a third channel 3013 and a fourth channel 3014 connected in parallel. The heat exchange channel 301 has an inlet and an outlet communicating with the outside. One end of the third channel 3013 may be connected to the inlet, and the other end to the outlet. Similarly, one end of the fourth channel 3014 may be connected to the inlet, and the other end to the outlet. Alternatively, if necessary, the heat exchange channel 301 may include other channels besides the aforementioned third channel 3013 and fourth channel 3014, such as an inlet channel and an outlet channel, with the third channel 3013 and fourth channel 3014 connected in parallel between the inlet channel and the outlet channel.

[0082] In this application, the first weld bead 302 includes a peripheral weld bead 3021 and a second inner weld bead 3023. The peripheral weld bead 3021 refers to the weld bead in the first weld bead 302 that surrounds the outermost part of the heat exchange flow channel 301. This peripheral weld bead 3021 does not extend into the gap between the third flow channel 3013 and the fourth flow channel 3014. The distance between this peripheral weld bead 3021 and the root of the outermost flow channel of the heat exchange flow channel 301 is no greater than 5 mm.

[0083] The second inner weld bead 3023 refers to the weld bead located within the outer weld bead 3021 and between the third flow channel 3013 and the fourth flow channel 3014. The second inner weld bead 3023 includes a second linear weld bead 3023a, and the distance from the second linear weld bead 3023a to the root of both the third and fourth flow channels 3013 and 3014 is no greater than 5 mm. Therefore, the third and fourth flow channels 3013 share this second linear weld bead 3023a, thereby reducing the length of the second inner weld bead 3023 and consequently reducing the length of the first weld bead 302. In other words, the second inner weld bead 3023 is no longer a closed annular structure; it is independent of the outer weld bead 3021. The second linear weld bead 3023a can be straight, broken, or curved, i.e., a structure with two endpoints, rather than a closed annular structure.

[0084] By including a third flow channel 3013 and a fourth flow channel 3014 arranged opposite to each other in the heat exchange channel 301, and setting the arrangement direction of the third flow channel 3013 and the fourth flow channel 3014 at an angle to the extension direction of the third flow channel 3013, the flow path of the heat exchange medium is increased, thereby increasing the heat dissipation area and improving the heat dissipation efficiency in a limited space. By including a peripheral weld 3021 and a second inner weld 3023 in the first weld bead 302, the peripheral weld 3021 surrounds the outer contour of the heat exchange channel 301 and avoids the area between the third channel 3013 and the fourth channel 3014, and the second inner channel includes a second linear weld 3023a, the distance from the second linear weld 3023a to the root of the third channel 3013 and the root of the fourth channel 3014 is not greater than 5mm, so that the third channel 3013 and the fourth channel 3014 share the second linear weld 3023a. Thus, while ensuring that the third channel 3013 and the fourth channel 3014 can be strengthened by the second linear weld 3023a to improve the pressure resistance, the total length of the second inner weld 3023 can also be reduced, thereby reducing the total length of the first weld bead 302. Furthermore, this arrangement reduces the risk that the second inner weld bead 3023 might be located on the flow wall of the third flow channel 3013 or the flow wall of the fourth flow channel 3014 due to the small distance between the third flow channel 3013 and the fourth flow channel 3014. By providing the second linear weld bead 3023a, the width of the third flow channel 3013 and the fourth flow channel 3014 can be widened, making the distance between the third flow channel 3013 and the fourth flow channel 3014 as small as possible. This increases the heat dissipation area and improves heat dissipation efficiency.

[0085] like Figure 10 As shown, in one embodiment of this application, the second inner weld bead 3023 further includes a second arc weld bead 3023b, which is connected to the end of the second linear weld bead 3023a.

[0086] The second circular arc weld bead 3023b is a circular, arc-shaped, or spiral weld bead. When one end of the second circular arc weld bead 3023b is connected to the end of the second linear weld bead 3023a, the other end of the second circular arc weld bead 3023b may or may not intersect with the second linear weld bead 3023a. One end of the second linear weld bead 3023a may be connected to the second circular arc weld bead 3023b, or both ends of the second linear weld bead 3023a may be connected to the second circular arc weld bead 3023b.

[0087] By connecting the second circular arc weld bead 3023b to the end of the second linear weld bead 3023a, the risk of stress concentration at the end of the second linear weld bead 3023a can be reduced, thereby improving the fatigue resistance of the second inner weld bead 3023.

[0088] like Figure 10 As shown, in one embodiment of this application, one end of the second arc weld bead 3023b is connected to the end of the second linear weld bead 3023a, and the other end is intersected with the second linear weld bead 3023a.

[0089] By connecting one end of the second arc weld bead 3023b to the second linear weld bead 3023a and intersecting the other end with the second linear weld bead 3023a, a more robust connection structure can be formed between the second arc weld bead 3023b and the second linear weld bead 3023a, reducing the risk of incomplete fusion or cracks at the end of the second linear weld bead 3023a and further improving the reliability of the second linear weld bead 3023a.

[0090] like Figure 5 As shown, in one embodiment of this application, a second weld bead 303 is formed between the first plate 31 and the second plate 32. The second weld bead 303 surrounds the first weld bead 302 and welds the edges of the first plate 31 and the edges of the second plate 32.

[0091] The second weld bead 303 is located at the edge of the heat exchange plate 30, used to weld the edges of the first plate 31 and the second plate 32 together, serving to seal the edge and enhance the overall structural strength. The second weld bead 303 surrounds the outside of the first weld bead 302, providing additional sealing protection on top of the first weld bead 302, further improving the sealing reliability of the heat exchange plate 30. It is understood that the first weld bead 302 mainly surrounds the heat exchange channel 301, serving to seal the channel and enhance its pressure resistance; while the second weld bead 303, located at the edge of the heat exchange plate 30, reduces the risk of condensate accumulating between the first plate 31 and the second plate 32, thereby reducing the risk of condensate corrosion of the first and second weld beads 302 and improving the overall sealing and structural strength of the heat exchange plate 30.

[0092] Please refer to the reference. Figure 4 and Figure 5 This application also proposes a heat exchange plate 30 applied to a battery device 100. The specific structure of the battery device 100 is as described in the above embodiments. Since the heat exchange plate 30 adopts all the technical solutions of all embodiments of the heat exchange plate 30 in the battery device 100, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here. The heat exchange plate 30 includes a first plate body 31 and a second plate body 32. The first plate body 31 and the second plate body 32 are arranged opposite to each other and connected. A heat exchange channel 301 and a first weld bead 302 are formed between the first plate body 31 and the second plate body 32. At least a portion of the first weld bead 302 is arranged around the edge of the heat exchange channel 301, and the distance between the first weld bead 302 and the root of the channel is L, where L is not greater than 5 mm.

[0093] 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. 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, so that when the first plate 31 and the second plate 32 are attached to each other, a closed heat exchange channel 301 is formed between them. The cross-sectional shape of the heat exchange channel 301 can be semi-circular, circular, or rectangular, and the orientation shape of the heat exchange channel 301 can be straight, L-shaped, U-shaped, S-shaped, or other irregular shapes.

[0094] The root of the flow channel refers to the bend where the sidewall of the flow channel transitions to the plane of the plate with the corresponding flow channel. A heat exchange medium flows inside the flow channel, which can be a liquid medium such as water or an aqueous solution of ethylene glycol, thereby providing uniform temperature dissipation for the battery cells 20 attached to the heat exchange plate 30.

[0095] In this application, the first plate 31 and the second plate 32 are welded together using laser welding. Laser welding offers advantages such as good formability, resistance to heat exchange medium corrosion, and lightweight design. Laser welding achieves a metallurgical seal between the two plates, with the laser's trajectory forming a weld bead between the first plate 31 and the second plate 32. In this application, the first weld bead 302 is arranged around the contour of the heat exchange channel 301. The distance between the first weld bead 302 and the root of the heat exchange channel 301 specifically refers to the perpendicular distance from the fusion centerline of the first weld bead 302 to the centerline of the root of the heat exchange channel 301.

[0096] By defining the distance between the first weld bead 302 and the root of the heat exchange channel 301 as L, and L≤5mm, the first weld bead 302 is made closer to the heat exchange channel 301, thus providing stronger support and constraint for the root of the heat exchange channel 301 and reducing the risk of deformation of the heat exchange channel 301. Specifically, the distance L between the first weld bead 302 and the root of the heat exchange channel 301 can be 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, etc.

[0097] The technical solution of this application arranges and connects the first plate 31 and the second plate 32 of the heat exchange plate 30 opposite to each other, forming a heat exchange channel 301 between the first plate 31 and the second plate 32. The heat exchange working fluid can flow in the heat exchange channel 301, thereby better dissipating heat from the battery cell 20 during the flow of the heat exchange working fluid. A first weld 302 is also formed between the first plate 31 and the second plate 32. The first weld 302 is located at a distance of no more than 5 mm from the root of the heat exchange channel 301, which reduces the distance between the two sides of the heat exchange channel 301 and the weld, thereby improving the pressure resistance of the heat exchange plate 30 channel and reducing the risk of channel deformation. At the same time, since the distance between the weld and the channel is reduced, the gap between them is reduced, and the heat exchange working fluid is less likely to accumulate in the gap, thereby reducing the possibility of corrosion of the heat exchange plate 30 or the weld by the heat exchange working fluid.

[0098] In addition, this configuration can also widen the heat exchange channel 301 as much as possible in the direction close to the first weld 302 while keeping the position of the first weld 302 unchanged. This increases the width of the heat exchange channel 301 and thus increases the heat dissipation area of ​​the battery cell 20, achieving a better heat dissipation effect.

[0099] This application also proposes an electrical device. As shown in FIG1, the electrical device includes a battery device 100, the specific structure of which 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 described in detail here. Specifically, the electrical device can be any of the aforementioned devices or systems that utilize the battery device 100.

[0100] 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, include: Battery cell; and A heat exchange plate, wherein at least one side of the battery cell is in contact with the heat exchange plate; the heat exchange plate comprises: First plate; and The second plate is disposed opposite to and connected to the first plate. A heat exchange channel and a first weld bead are formed between the first plate and the second plate. At least a portion of the first weld bead is disposed around the edge of the heat exchange channel, and the distance between the first weld bead and the root of the heat exchange channel is L, where L is not greater than 5mm.

2. The battery device as claimed in claim 1, characterized in that, L is no more than 3mm.

3. The battery device as claimed in claim 1, characterized in that, The heat exchange channel includes a first channel and a second channel arranged opposite to each other. The arrangement direction of the first channel and the second channel is at an angle to the extension direction of the first channel. One end of the first channel is connected to one end of the second channel, and the end of the first channel away from the second channel and the end of the second channel away from the first channel form an opening. The first weld bead includes an outer weld bead and a first inner weld bead. The outer weld bead is arranged around the outer contour of the heat exchange channel and avoids the area between the first channel and the second channel. The first inner weld bead includes a first linear weld bead, and the first linear weld bead is located between the first channel and the second channel. The distance from the first linear weld bead to the root of the first channel and the root of the second channel is not greater than 5 mm.

4. The battery device as claimed in claim 3, characterized in that, The end of the first linear weld bead near the opening intersects with the outer weld bead.

5. The battery device as claimed in claim 4, characterized in that, The first linear weld bead extends beyond the area enclosed by the outer weld bead at one end near the opening.

6. The battery device as claimed in claim 3, characterized in that, The first inner weld bead also includes a first circular arc weld bead, which is connected to the end of the first linear weld bead away from the opening.

7. The battery device as claimed in claim 6, characterized in that, One end of the first circular arc weld bead is connected to the end of the first linear weld bead away from the opening, and the other end is arranged to intersect with the first linear weld bead.

8. The battery device as claimed in claim 1, characterized in that, The heat exchange channel includes a third channel and a fourth channel arranged opposite to each other. The third channel and the fourth channel are arranged in parallel. The arrangement direction of the third channel and the fourth channel is at an angle to the extension direction of the third channel. The two ends of the third channel are respectively connected to the two ends of the fourth channel. The first weld bead includes a peripheral weld bead and a second inner weld bead. The peripheral weld bead is arranged around the outer contour of the heat exchange flow channel and avoids the area between the third flow channel and the fourth flow channel. The second inner weld bead includes a second linear weld bead, which is located between the third flow channel and the fourth flow channel and is isolated from the peripheral weld bead. The distance from the second linear weld bead to the root of the third flow channel and the root of the fourth flow channel is not greater than 5 mm.

9. The battery device as claimed in claim 8, characterized in that, The second inner weld bead also includes a second circular arc weld bead, which is connected to the end of the second linear weld bead.

10. The battery device as claimed in claim 9, characterized in that, One end of the second arc weld bead is connected to the end of the second linear weld bead, and the other end is intersected with the second linear weld bead.

11. The battery device according to any one of claims 1 to 10, characterized in that, A second weld bead is formed between the first plate and the second plate. The second weld bead surrounds the first weld bead and welds the edges of the first plate and the edges of the second plate.

12. A heat exchange plate, characterized in that, The heat exchange plate, used in battery devices, comprises: First plate; and The second plate is disposed opposite to and connected to the first plate. A heat exchange channel and a first weld bead are formed between the first plate and the second plate. At least a portion of the first weld bead is disposed around the edge of the heat exchange channel, and the distance between the first weld bead and the root of the channel is not greater than 5 mm.

13. An electrical appliance, characterized in that, Includes the battery device as described in any one of claims 1 to 11.

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