Heat exchange plate and battery device

Abstract

The utility model relates to the technical field of batteries, and provides a heat exchange plate and a battery device, the heat exchange plate comprises a first side plate and a second side plate, the first side plate is an aluminum structure or an aluminum alloy structure; the second side plate and the first side plate are oppositely arranged, and a groove used for forming a heat exchange channel is formed in the side, facing the first side plate, of the second side plate. The second side plate comprises a main body layer and a protective layer, the protective layer is located between the main body layer and the first side plate, the main body layer is of a steel structure, and the protective layer is of an aluminum structure or an aluminum alloy structure; wherein the thickness of the area, located outside the groove, of the second side plate is g mm, the depth of the groove is d mm, the thickness of the area, located outside the groove, of the protective layer is x mm, and x * 0.01 * (1-(4.55 d-5.36)) > lambda * g; lambda is equal to 10%; the side face of the groove comprises an arc area, and the central angle of the arc area ranges from 105 degrees to 120 degrees. X / g ranges from 0.1 to 0.9. The heat exchange plate not only has higher strength, but also can prevent the main body layer from being corroded.

Description

[0001] The present application is a divisional application of the utility model application No. 202421416066.4, with the title of "Heat exchange plate and battery device", filed on June 19, 2024. TECHNICAL FIELD

[0002] The utility model relates to battery technology field, especially to a kind of heat exchange plate, battery device. BACKGROUND

[0003] In the related art, the battery device is generally provided with a heat exchange plate for heat exchange with the battery. In the related art, the heat exchange plate is generally formed by brazing an aluminum alloy stamping plate. Limited by the brazing filler, the heat exchange plate generally adopts a 3-series aluminum plate, and the heat exchange plate made of the 3-series aluminum plate has weak strength, which can easily lead to deformation and damage of the heat exchange plate. Especially when the heat exchange plate needs to support the battery, the overall vibration impact modal of the battery device is difficult to achieve satisfactory results.

[0004] It should be noted that the information disclosed in the above BACKGROUND section is only used to enhance the understanding of the background of the present disclosure, and therefore can include information that does not constitute prior art known to those of ordinary skill in the art. SUMMARY

[0005] The utility model provides a kind of heat exchange plate, which can improve the technical problem of weak strength.

[0006] According to an aspect of the present disclosure, the heat exchange plate comprises:

[0007] The first side plate is of aluminum or aluminum alloy structure.

[0008] The second side plate has a large face opposite to the large face of the first side plate, and a side of the second side plate facing the first side plate is formed with a groove for forming a heat exchange channel.

[0009] The second side plate includes a main body layer and a protective layer, the protective layer is located between the main body layer and the first side plate, the main body layer is of steel structure, and the protective layer is of aluminum or aluminum alloy structure.

[0010] The thickness of the second side plate in the area outside the groove is g millimeters, the depth of the groove is d millimeters, the thickness of the protective layer in the area outside the groove is x millimeters, and x×0.01×(1-(4.55d-5.36))>λ×g.

[0011] Wherein, λ is equal to 10%.

[0012] On the one hand, the main body layer in the second side plate is provided as a steel structure, the steel structure has high strength, and the arrangement can improve the overall strength of the heat exchange plate; on the other hand, the protective layer is arranged on the side of the second side plate facing the first side plate, the protective layer can not only avoid corrosion of the main body layer by the heat conduction medium between the first side plate and the second side plate, but also improve the welding strength of the first side plate and the second side plate; on the other hand, the thickness of the protective layer is set according to the formula x*0.01*(1-(4.55d-5.36))>lambda*g, since the protective layer is thinned at the bending position of the groove side, and the depth of the groove affects the thinning rate of the protective layer at the bending position of the groove side, the thickness of the protective layer is set according to the depth of the groove and the coefficient lambda to ensure that the thickness of the protective layer at the bending position of the groove side is greater than the corrosion depth of the heat exchange medium, wherein x*0.01*(1-(4.55d-5.36)) represents the thickness of the protective layer at the bending position of the groove side, and lambda*g represents the corrosion depth of the heat exchange medium; on the other hand, the steel structure has low heat conduction speed, and the heat exchange plate can have a directional heat dissipation function, that is, the heat exchange plate can reduce the heat dissipation amount of the battery through the second side plate.

[0013] According to one aspect of the present disclosure, the utility model also provides a battery device, the battery device includes above-mentioned heat exchange plate.

[0014] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the present disclosure. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to better understand the present disclosure, reference can be made to the embodiments shown in the following drawings. The components in the drawings are not necessarily to scale, and related elements can be omitted in order to emphasize and clearly illustrate the technical features of the present disclosure. In addition, related elements or components can have different settings as known in the art. Furthermore, in the drawings, the same reference numerals represent the same or similar components in each drawing.

[0016] Wherein:

[0017] Figure 1 Structure schematic view of an exemplary embodiment of the heat exchange plate of the present disclosure;

[0018] Figure 2 Structure schematic view of an exemplary embodiment of the heat exchange plate of the present disclosure; Figure 1 Exploded view of the heat exchange plate shown;

[0019] Figure 3 Structure schematic view of an exemplary embodiment of the heat exchange plate of the present disclosure; Figure 1 Partial cross-sectional view of the heat exchange plate shown along the dotted line AA;

[0020] Figure 4 Structure schematic view of an exemplary embodiment of the heat exchange plate of the present disclosure; Figure 1Partial cross-sectional view of the heat exchange plate shown along the dotted line AA;

[0021] Figure 5 For Figure 3 Partial cross-sectional view of the heat exchange plate shown along the dotted line BB;

[0022] Figure 6 Structure schematic diagram of an exemplary embodiment of the battery device of the present disclosure;

[0023] Figure 7 Structure schematic diagram of another exemplary embodiment of the battery device of the present disclosure.

[0024] Explanation of reference signs:

[0025] 1, first side plate; 2, second side plate; 21, main body layer; 22, protective layer; 3, groove; 311, circular arc area; 32, bottom surface; 4, welding layer; 5, battery; 6, battery box; 7, heat exchange channel. DETAILED DESCRIPTION

[0026] The technical solutions in the example embodiments of the present disclosure will be described clearly and completely below in combination with the drawings in the example embodiments of the present disclosure. The example embodiments described herein are only for illustrative purposes, and are not intended to limit the protection scope of the present disclosure, so it should be understood that various modifications and changes can be made to the example embodiments without departing from the protection scope of the present disclosure.

[0027] In the description of the present disclosure, unless explicitly specified and limited, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance; the term "multiple" means two or more; the term "and / or" includes any combination and all combinations of one or more associated listed items. In particular, referring to "the" object or "one" object is also intended to represent one of the possible multiple such objects.

[0028] Unless otherwise specified or explained, the terms "connection", "fixation" and the like should be interpreted broadly, for example, "connection" can be fixed connection, or detachable connection, or integrally connected, or electrically connected, or signal connected; "connection" can be directly connected, or indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the present disclosure can be understood according to the specific circumstances.

[0029] Further, in the description of the present disclosure, it needs to be understood that the orientation words such as "upper", "lower", "inner", "outer" and the like described in the example embodiments of the present disclosure are described in the angle shown in the drawings, and should not be understood as the limitation of the example embodiments of the present disclosure. It also needs to be understood that in the context, when referring to one element or feature connected to another element or one or more elements "on", "under", or "inner", "outer", it can not only be directly connected to another element or one or more elements "on", "under", or "inner", "outer", but also indirectly connected to another element or one or more elements "on", "under", or "inner", "outer" through intermediate elements.

[0030] As shown in Figures 1-5 , Figure 1 is a structural schematic view of an example embodiment of the heat exchange plate of the present disclosure, Figure 2 is Figure 1 an exploded view of the heat exchange plate shown, Figure 3 is Figure 1 a partial cross-sectional view of the heat exchange plate shown along the dashed line AA, Figure 4 is Figure 1 a partial cross-sectional view of the second side plate in the heat exchange plate along the dashed line AA, Figure 5 is Figure 3 a partial cross-sectional view of the heat exchange plate along the dashed line BB.

[0031] The heat exchange plate comprises a first side plate 1 and a second side plate 2, the first side plate 1 is an aluminum structure or an aluminum alloy structure; the large surface of the second side plate 2 is arranged opposite to the large surface of the first side plate 1, and the side of the second side plate 2 facing the first side plate 1 is formed with a groove 3 for forming a heat exchange channel 7; wherein the second side plate 2 comprises a main body layer 21 and a protective layer 22, the protective layer 22 is located between the main body layer 21 and the first side plate 1, the main body layer 21 is a steel structure, and the protective layer 22 is an aluminum structure or an aluminum alloy structure; the thickness of the second side plate 2 in the area outside the groove 3 is g millimeters, the depth of the groove 3 is d millimeters, the thickness of the protective layer 22 in the area outside the groove 3 is x millimeters, x x 0.01 x (1-(4.55d-5.36)) > λ x g; wherein λ is equal to 10%.

[0032] In one aspect, the body layer in the second side plate is provided as a steel structure in the example embodiment, which has high strength, and this arrangement can improve the overall strength of the heat exchange plate. In another aspect, the protective layer is provided on the side of the second side plate facing the first side plate, which has corrosion resistance, and the protective layer can not only avoid corrosion of the body layer by the heat-conducting medium between the first side plate and the second side plate, but also improve the welding strength of the first side plate and the second side plate. In yet another aspect, the thickness of the protective layer is set according to the formula x x 0.01 x (1-(4.55d-5.36)) > λ x g. Since the protective layer will be thinned at the bending position of the groove wall, and the depth of the groove will affect the thinning rate of the protective layer at the bending position of the groove wall, the thickness of the protective layer is set according to the depth of the groove and the coefficient λ to ensure that the thickness of the protective layer at the bending position of the groove wall is greater than the corrosion depth of the heat exchange medium, where x x 0.01 x (1-(4.55d-5.36)) represents the thickness of the protective layer at the bending position of the groove wall, and λ x g represents the corrosion depth of the heat exchange medium. In yet another aspect, the steel structure has low heat conduction speed, and the heat exchange plate can have the function of directional heat dissipation, i.e., the heat exchange plate can reduce the heat dissipation amount of the battery through the second side plate. In yet another aspect, the protective layer is provided as an aluminum structure or an aluminum alloy structure in the example embodiment, and the aluminum-containing protective layer is convenient for welding with the first side plate, and the aluminum-containing protective layer has high ductility, so that the thinning rate of the protective layer at the bending position is relatively low.

[0033] It should be noted that the heat exchange channel in the heat exchange plate can be used to accommodate the heat-conducting medium, which can be a gas or a liquid. The heat-conducting medium circulates in the heat exchange channel to achieve heat exchange with the battery. In addition, the heat-conducting medium can also be a solid. In the example embodiment, the heat exchange plate can not only cool the battery but also heat the battery. For example, when the temperature of the battery is relatively high, the heat exchange plate can cool the battery to improve the safety and stability of the battery pack. When the battery is affected by the normal use due to the excessively low temperature in the extremely cold environment, the heat exchange plate can heat the battery so that the battery pack can adapt to more use environments.

[0034] In the example embodiment, as shown in FIG. 1, the heat exchange plate 100 includes a first side plate 110, a second side plate 120, and a heat exchange channel 130. Figures 1-5As shown in the figure, x / g is 0.1-1.72, for example, x / g can be equal to 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.72, etc. In this exemplary embodiment, the protective layer 22 and the main body layer 21 can be compounded to form a composite layer, and then the composite layer can be punched or the like to form the groove on the composite layer. In this exemplary embodiment, x / g is set to an appropriate size, so that the protective layer 22 and the main body layer 21 can be compounded and subsequent punching or the like can be facilitated.

[0035] In this exemplary embodiment, the protective layer 22 and the main body layer 21 can be compounded by a hot rolling or cold rolling process to form the second side plate 2.

[0036] In this exemplary embodiment, as shown in the figure, Figures 1-5 As shown in the figure, x can be 0.125-1.2, for example, x can be equal to 0.125, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1, 1.1, 1.2, etc. In this exemplary embodiment, x is set to an appropriate size, which can not only avoid the heat exchange plate being too heavy, but also avoid the main body layer 21 being corroded.

[0037] In this exemplary embodiment, as shown in the figure, Figures 1-5 As shown in the figure, the side surface of the groove 3 includes a circular arc area 311, the second side plate 2 includes a flat portion 25 located outside the groove 3, the center axis of the circular arc area 311 is parallel to the flat portion 25, and the central angle a of the circular arc area 311 is 105°-120°, for example, the central angle of the circular arc area 311 can be equal to 105°, 106°, 107°, 108°, 109°, 110°, 111°, 112°, 113°, 114°, 115°, 116°, 117°, 118°, 119°, 120°, etc. If the central angle of the circular arc area 311 is too large, the inclination degree of the groove side surface relative to the groove bottom surface 32 is relatively gentle, and in order to achieve the same groove depth, the groove 3 needs to have a larger opening size, so that the groove 3 will occupy a larger space; if the central angle of the circular arc area 311 is too small, the requirement for the synchronous extension of the main body layer 21 and the protective layer 22 is too high. In this exemplary embodiment, the central angle of the circular arc area 311 is set to an appropriate size, which can not only facilitate the punching forming of the second side plate, but also avoid the groove 3 occupying too much space of the second side plate 2. The center axis of the circular arc area 311 is a straight line passing through the center of the circular arc area 311 and parallel to the circular arc area 311.

[0038] In this exemplary embodiment, as shown in the figure, Figures 1-5As shown, the radius of curvature of the arc region 311 is greater than or equal to 2 mm. For example, the radius of curvature of the arc region 311 can be 2 mm, 2.2 mm, 2.4 mm, 2.6 mm, 2.8 mm, 3 mm, 3.2 mm, 3.4 mm, 3.6 mm, 3.8 mm, 4 mm, etc. If the radius of curvature of the arc region 311 is too small, the requirement for synchronous extension of the main layer 21 and the protective layer 22 is too high. In this exemplary embodiment, the radius of curvature of the arc region 311 is set larger, thereby facilitating the synchronous stamping of the main layer 21 and the protective layer 22.

[0039] like Figures 1-5 As shown, the side surface of the groove 3 includes two arcuate areas 311. One arcuate area 311 is connected to the bottom surface 32 of the groove, and the other arcuate area 311 is connected to the flat side surface of the second side plate located outside the groove and facing the first side plate. The two arcuate areas 311 can be directly connected or connected by a flat area.

[0040] In this exemplary embodiment, Figures 1-5 As shown, d / g is 1.6-6.7. d / g can be 1.6, 1.8, 2, 2.2, 2.4, 2.6, 2.8, 3, 3.2, 3.4, 3.6, 3.8, 4, 4.2, 4.4, 4.6, 4.8, 5, 5.2, 5.4, 5.6, 5.8, 6, 6.2, 6.4, 6.6, 6.7, etc. A d / g that is too large increases the material usage of the second side plate 2, increasing costs. A d / g that is too small increases the resistance along the heat exchange channel 7, thereby affecting the flow resistance performance of the entire heat exchange plate. This exemplary embodiment sets d / g to an appropriate value, which can reduce the material usage of the second side plate 2 while also ensuring the flow resistance performance of the heat exchange plate.

[0041] In this exemplary embodiment, Figures 1-5 As shown, g can be 0.7-1.2. For example, g can be 0.7, 0.8, 0.9, 1, 1.1, 1.2, and so on. If g is too large, the overall weight of the heat exchange plate is large; if g is too small, the strength of the second side plate is weak, especially when the second side plate is located at the bottom of the battery box, and the second side plate is easily damaged. In this exemplary embodiment, g is set to an appropriate value, which not only ensures the strength of the heat exchange plate but also prevents the heat exchange plate from being too heavy.

[0042] In this exemplary embodiment, Figures 1-5As shown, the first side plate 1 and the second side plate 2 can be welded by a brazing process. Correspondingly, the heat exchange plate can further include a welding layer 4, the welding layer 4 being welded between the first side plate 1 and the second side plate 2, the melting point of the welding layer 4 being less than the melting point of the protective layer 22, and / or the melting point of the welding layer 4 being less than the melting point of the first side plate 1. In the present example embodiment, the first side plate 1 and the second side plate 2 are welded by brazing filler metal with a lower melting point, which not only improves the welding efficiency of the first side plate 1 and the second side plate 2, but also avoids the protective layer 22 being welded through.

[0043] In the present example embodiment, as shown in Figures 1-5 The material of the welding layer 4 can be 4-series aluminum. 4-series aluminum has a lower melting point.

[0044] In the present example embodiment, as shown in Figures 1-5 The material of the protective layer 22 can be 1-series aluminum, and / or the material of the first side plate 1 can be 3-series aluminum. 1-series aluminum has a higher corrosion resistance, and the protective layer 22 of 1-series aluminum and the first side plate 1 of 3-series aluminum are easy to weld.

[0045] It should be understood that in other example embodiments, the welding layer 4, the protective layer 22, and the first side plate 1 can also be other series of aluminum structures or aluminum alloy structures.

[0046] In the present example embodiment, the aluminum alloy material can be aluminum-magnesium alloy, aluminum-manganese alloy, and other materials containing aluminum. Steel is a general term for iron-carbon alloys with a carbon content of 0.02% to 2.11%. The chemical composition of steel can vary greatly, containing small amounts of elements such as manganese, phosphorus, silicon, sulfur, etc. In actual production, steel often contains different alloying elements such as manganese, nickel, vanadium, etc. according to different uses.

[0047] In the present example embodiment, as shown in Figures 1-5 The first side plate 1 can be a flat plate structure, the thickness of the first side plate 1 being a millimeters, the thickness of the main body layer 21 in the area outside the groove 3 being b millimeters, a / b being 0.1-9, for example, a / b can be equal to 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1, 2, 3, 4, 5, 6, 7, 8, 9, etc. If a / b is too large, the thickness of the main body layer 21 is too small, and the strength of the heat exchange plate is low. If a / b is too small, the thickness of the first side plate 1 is too small, the strength of the first side plate 1 is weak, and the first side plate is easy to be damaged when the battery is pressure released. The present example embodiment sets a / b to an appropriate size, which can ensure the overall strength of the heat exchange plate.

[0048] The second side plate 2 is located in the area parallel to the first side plate outside the groove 3.

[0049] In this exemplary embodiment, the first side plate 1 may also be provided with an insulating anti-corrosion layer and other structures.

[0050] This exemplary embodiment also provides a battery device, which may include the above-mentioned heat exchange plate.

[0051] like Figure 6 FIG2 is a schematic diagram of the structure of an exemplary embodiment of the battery device disclosed herein. The battery device further includes a battery 5 , which is located on a side of the first side plate 1 facing away from the second side plate 2 .

[0052] In this exemplary embodiment, the thickness of the first side plate 1 is 1 mm to 3 mm. For example, the thickness of the first side plate 1 can be equal to 1 mm, 2 mm, 3 mm, etc.

[0053] In this exemplary embodiment, since the second side plate 2 has a relatively high strength, the battery device may not be provided with a bottom guard plate located at the bottom of the battery box. It should be understood that in other exemplary embodiments, the battery device may also be provided with a bottom guard plate to further improve the overall strength of the battery device.

[0054] like Figure 7 FIG2 is a schematic structural diagram of another exemplary embodiment of a battery device according to the present disclosure. The battery device includes a battery box 6 , which includes a bottom plate. The bottom plate of the battery box 6 can be reused as the first side plate 1 .

[0055] It should be noted that a battery comprises a cell and an electrolyte. A battery is the smallest unit capable of carrying out electrochemical reactions such as charge and discharge. A cell is formed by winding or laminating a stack of components, which includes a first electrode, a separator, and a second electrode. When the first electrode is a positive electrode, the second electrode is a negative electrode. The polarity of the first and second electrodes can be interchangeable. The first and second electrodes are coated with an active material.

[0056] In this exemplary embodiment, the battery may be a lithium-ion battery. It should be understood that in other exemplary embodiments, the battery may also be a nickel-cadmium battery, a nickel-metal hydride battery, a lithium polymer battery, a sodium-ion battery, a solid-state battery, etc.

[0057] In this exemplary embodiment, the battery can be a square battery, that is, the battery can be a quadrangular prism battery. The quadrangular prism battery mainly refers to a battery with a prism shape, but it is not strictly limited whether each side of the prism must be a straight line in the strict sense, and the corners between the sides are not necessarily right angles, and can be arc transitions.

[0058] In other exemplary embodiments, the battery may be a cylindrical battery, and the battery case of the cylindrical battery may include two circular end surfaces and a curved surface located between the two circular end surfaces.

[0059] The battery can be a winding battery, i.e., a first pole piece, a second pole piece electrically opposite to the first pole piece, and a diaphragm piece arranged between the first pole piece and the second pole piece are wound to obtain a winding core.

[0060] In the example embodiment, the battery device is a battery module or a battery pack.

[0061] The battery module includes a plurality of batteries, which can be square batteries. The battery module can further include end plates and side plates for fixing the plurality of batteries. The battery can be a cylindrical battery, which can be arranged on a support plate to form the battery module.

[0062] The battery pack includes a plurality of batteries and a box body for fixing the plurality of batteries.

[0063] It should be noted that the battery pack includes batteries, which can be a plurality of batteries arranged in the box body. The plurality of batteries can be installed in the box body after forming a battery module. Alternatively, the plurality of batteries can be directly arranged in the box body, i.e., without grouping the plurality of batteries, the plurality of batteries are fixed by the box body.

[0064] It should be noted that the battery device proposed in the utility model can be used in various electric devices, such as mobile phones, portable devices, notebook computers, various vehicles (such as electric vehicles, electric cars, etc.), ships, spacecraft, electric toys, and electric tools, etc. Further, the spacecraft described above can include, for example, airplanes, rockets, space shuttles, and spacecraft, etc. The electric toys described above can include, for example, fixed or mobile electric toys (such as game consoles, electric car toys, electric ship toys, and electric plane toys, etc.). The electric tools described above can include, for example, metal cutting electric tools, grinding electric tools, assembly electric tools, and railway electric tools, which can be, for example, electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planes. It should be understood that in various possible embodiments consistent with the design concept of the utility model, the cylindrical battery or the battery device proposed in the utility model is not only limited to the above-described devices, but can also be applied to all devices using batteries. For the sake of brevity, each embodiment in the specification is described by taking a vehicle as an example.

[0065] In the present application, "parallel" not only means complete parallel, but also can have a certain error; for example, the included angle between the two is greater than or equal to 0° and less than or equal to 5°, i.e., the two are considered to be parallel to each other.

[0066] Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the concepts disclosed herein. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.

[0067] The drawings in the present disclosure only relate to the structures involved in the present disclosure, and other structures can refer to the usual design. The embodiments of the present disclosure and the features in the embodiments can be combined with each other to obtain new embodiments without conflict. Those skilled in the art should understand that the technical solutions of the present disclosure can be modified or replaced equivalently without departing from the spirit and scope of the technical solutions of the present disclosure, and all should be covered in the scope of the claims of the present disclosure.

[0068] It should be understood that the present disclosure is not limited to the precise structures described above and shown in the drawings, and various modifications and changes can be made without departing from the scope thereof. The scope of the present disclosure is only limited by the appended claims.

Claims

1. A heat exchange plate, characterized in that The heat exchange plate comprises: a first side plate (1) which is an aluminum structure or an aluminum alloy structure; a second side plate (2) which is opposite to the large face of the first side plate (1), and a side of the second side plate (2) facing the first side plate (1) is provided with a groove (3) for forming a heat exchange channel (7); wherein the second side plate (2) comprises a main body layer (21) and a protective layer (22), the protective layer (22) is located between the main body layer (21) and the first side plate (1), the main body layer (21) is a steel structure, and the protective layer (22) is an aluminum structure or an aluminum alloy structure; the thickness of the second side plate (2) in the area outside the groove (3) is g millimeters, the depth of the groove (3) is d millimeters, the thickness of the protective layer (22) in the area outside the groove (3) is x millimeters, and x*0.01*(1-(4.55d-5.36))>λ*g; wherein λ is equal to 10%; the side of the groove (3) comprises a circular arc area (311), the second side plate (2) comprises a flat portion (25) outside the groove (3), the central axis of the circular arc area (311) is parallel to the flat portion (25), and the radius of curvature of the circular arc area (311) is greater than or equal to 2 millimeters; x / g is 0.1-0.

9.

2. The heat exchange plate according to claim 1, characterized in that x is 0.125-1.

2.

3. The heat exchange plate according to claim 1, characterized in that g is 0.7-1.

2.

4. The heat exchange plate according to claim 1, characterized in that the side of the groove (3) comprises a circular arc area (311), the second side plate (2) comprises a flat portion (25) outside the groove (3), the central axis of the circular arc area (311) is parallel to the flat portion (25), and the central angle of the circular arc area (311) is 105°-120°.

5. The heat exchange plate according to claim 1, characterized in that d / g is 1.6-6.

7.

6. The heat exchanger plate according to any of claims 1-5, characterised in that The heat exchange plate further comprises: a welding layer (4) welded between the first side plate (1) and the second side plate (2), the melting point of the welding layer (4) is less than the melting point of the protective layer (22), and / or the melting point of the welding layer (4) is less than the melting point of the first side plate (1).

7. The heat exchange plate according to claim 6, characterized in that The material of the welding layer (4) is 4-series aluminum.

8. The heat exchanger plate according to any of claims 1-5, characterised in that The material of the protective layer (22) is 1-series aluminum; and / or, the material of the first side plate (1) is 3-series aluminum.

9. The heat exchanger plate according to any of claims 1-5, characterised in that The first side plate (1) is a flat plate structure, the thickness of the first side plate (1) is a millimeters, the thickness of the main body layer (21) in the area outside the groove (3) is b millimeters, and a / b is 0.1-9.

10. A battery device characterized by comprising: The battery device comprises the heat exchange plate according to any one of claims 1-9.

11. The battery device of claim 10, wherein, The battery device further comprises a battery (5) located on the side of the first side plate (1) away from the second side plate (2).

12. The battery device of claim 11, wherein, The thickness of the first side plate (1) is 1-3 millimeters.

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