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 heat exchange plate not only has higher strength, but also can prevent the main body layer from being corroded.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a heat exchange plate and a battery device. Background Art

[0002] In the related art, the battery device is generally provided with a heat exchange plate, which is used to exchange heat with the battery. In the related art, the heat exchange plate is generally formed by brazing using an aluminum alloy stamping plate. Due to the limitation of the brazing filler, the heat exchange plate is generally made of a 3-series aluminum plate, which has a weak strength and is easy to cause deformation and damage to the heat exchange plate. Especially when the heat exchange plate needs to support the battery, it is difficult to obtain satisfactory results in the vibration impact mode of the entire battery device.

[0003] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present disclosure, and therefore may include information that does not constitute the prior art known to ordinary technicians in the field. Utility Model Content

[0004] The utility model provides a heat exchange plate, which can improve the technical problem of weak strength of the heat exchange plate.

[0005] According to one aspect of the present disclosure, a heat exchange plate comprises:

[0006] A first side plate, the first side plate is an aluminum structure or an aluminum alloy structure;

[0007] A second side plate, wherein a large surface of the second side plate is arranged opposite to a large surface of the first side plate, and a groove for forming a heat exchange channel is formed on a side of the second side plate facing the first side plate;

[0008] 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 a steel structure, and the protective layer is an aluminum structure or an aluminum alloy structure;

[0009] The thickness of the second side plate outside the groove is g mm, the depth of the groove is d mm, the thickness of the protective layer outside the groove is x mm, x×0.01×(1-(4.55d-5.36))>λ×g;

[0010] Here, λ is equal to 10%.

[0011] On the one hand, the utility model sets the main layer in the second side plate as a steel structure, and the steel structure has high strength. This setting can improve the overall strength of the heat exchange plate; on the other hand, the utility model sets a protective layer on the side of the second side plate facing the first side plate. The protective layer can not only prevent the main layer from being corroded by the heat-conducting medium between the first side plate and the second side plate, but also the aluminum-containing protective layer can improve the welding strength of the first side plate and the second side plate; on the other hand, the utility model sets the thickness of the protective layer according to the formula x×0.01×(1-(4.55d-5.36))>λ×g. Since the protective layer is on the side of the groove The bending position will be thinned, and the depth of the groove will affect the thinning rate of the protective layer at the bending position of the groove side. The utility model sets the thickness of the protective layer 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 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 λ×g represents the corrosion depth of the heat exchange medium; on the other hand, the steel structure has a lower thermal conductivity, and the heat exchange plate can have the function of directional heat dissipation, that is, the heat exchange plate can reduce the heat dissipation of the battery through the second side plate.

[0012] According to one aspect of the present disclosure, the utility model also provides a battery device, which includes the above-mentioned heat exchange plate.

[0013] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to better understand the present disclosure, reference may be made to the embodiments shown in the following drawings. The components in the drawings are not necessarily to scale, and related elements may be omitted in order to emphasize and clearly illustrate the technical features of the present disclosure. In addition, related elements or components may have different arrangements as known in the art. In addition, in the drawings, the same reference numerals represent the same or similar components in each drawing.

[0015] in:

[0016] Figure 1 It is a structural schematic diagram of an exemplary embodiment of the heat exchange plate disclosed in the present invention;

[0017] Figure 2 for Figure 1 An exploded view of the heat exchange plate shown;

[0018] Figure 3 for Figure 1 A partial cross-sectional view of the heat exchange plate along the dashed line AA shown;

[0019] Figure 4 for Figure 1A partial cross-sectional view of the second side plate of the heat exchange plate shown along the dotted line AA;

[0020] Figure 5 for Figure 3 A partial cross-sectional view of the heat exchange plate along the dotted line BB shown;

[0021] Figure 6 It is a structural schematic diagram of an exemplary embodiment of the battery device disclosed in the present invention;

[0022] Figure 7 FIG. 4 is a schematic structural diagram of another exemplary embodiment of a battery device disclosed herein.

[0023] Description of reference numerals:

[0024] 1. First side plate; 2. Second side plate; 21. Main body layer; 22. Protective layer; 3. Groove; 311. Arc area; 32. Bottom surface; 4. Welding layer; 5. Battery; 6. Battery box; 7. Heat exchange channel. DETAILED DESCRIPTION

[0025] The following will be combined with the accompanying drawings in the exemplary embodiments of the present disclosure to clearly and completely describe the technical solutions in the exemplary embodiments of the present disclosure. The exemplary embodiments described herein are only for illustrative purposes and are not intended to limit the scope of protection of the present disclosure. Therefore, it should be understood that various modifications and changes can be made to the exemplary embodiments without departing from the scope of protection of the present disclosure.

[0026] In the description of the present disclosure, unless otherwise clearly specified and limited, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance; the term "plurality" refers to two or more; the term "and / or" includes any and all combinations of one or more associated listed items. In particular, reference to "the / the" object or "an" object is also intended to indicate one of a possible plurality of such objects.

[0027] Unless otherwise specified or explained, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, an integral connection, an electrical connection, or a signal connection; "connection" can be a direct connection or an indirect connection through an intermediate medium. For those skilled in the art, the specific meanings of the above terms in this disclosure can be understood according to specific circumstances.

[0028] Further, in the description of the present disclosure, it should be understood that the directional words such as "upper", "lower", "inner", "outer" and the like described in the exemplary embodiments of the present disclosure are described at the angles shown in the accompanying drawings and should not be understood as limitations on the exemplary embodiments of the present disclosure. It should also be understood that, in the context, when it is mentioned that an element or feature is connected to one or more "upper", "lower", or "inner", "outer" of another element, it can not only be directly connected to the "upper", "lower", "inner", "outer" of another element or elements, but can also be indirectly connected to the "upper", "lower", "inner", "outer" of another element or elements through an intermediate element.

[0029] like Figure 1-5 As shown, Figure 1 This is a schematic structural diagram of an exemplary embodiment of a heat exchange plate disclosed in the present invention. Figure 2 for Figure 1 The exploded view of the heat exchange plate shown, Figure 3 for Figure 1 The partial cross-sectional view of the heat exchange plate along the dotted line AA is shown. Figure 4 for Figure 1 A partial cross-sectional view of the second side plate of the heat exchange plate along the dotted line AA, Figure 5 for Figure 3 The heat exchange plate is shown in a partial cross-sectional view along the dotted line BB.

[0030] The heat exchange plate includes: 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 a groove 3 for forming a heat exchange channel 7 is formed on the side of the second side plate 2 facing the first side plate 1; wherein the second side plate 2 includes 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 mm, the depth of the groove 3 is d mm, and the thickness of the protective layer 22 in the area outside the groove 3 is x mm, x×0.01×(1-(4.55d-5.36))>λ×g; wherein λ is equal to 10%.

[0031] On the one hand, in this exemplary embodiment, the main body layer in the second side plate is set as a steel structure, which has high strength. This setting can improve the overall strength of the heat exchange plate; on the other hand, in this exemplary embodiment, a protective layer is set on the side of the second side plate facing the first side plate. The protective layer has corrosion resistance. The protective layer can not only prevent the main body layer from being corroded by the heat-conducting medium between the first side plate and the second side plate, but also the aluminum-containing protective layer can improve the welding strength of the first side plate and the second side plate; on the other hand, in this exemplary embodiment, the thickness of the protective layer is set according to the formula x×0.01×(1-(4.55d-5.36))>λ×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, In this exemplary embodiment, 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, wherein x×0.01×(1-(4.55d-5.36)) represents the thickness of the protective layer at the bending position of the groove wall, and λ×g represents the corrosion depth of the heat exchange medium; on the other hand, the steel structure has a lower thermal conductivity, and the heat exchange plate can have the function of directional heat dissipation, that is, the heat exchange plate can reduce the heat dissipation of the battery through the second side plate; on the other hand, in this exemplary embodiment, the protective layer is set to an aluminum structure or an aluminum alloy structure, and the aluminum-containing protective layer is convenient for welding with the first side plate. At the same time, the aluminum-containing protective layer has a higher elongation, so that the thinning rate of the protective layer at the bending position will be relatively low.

[0032] It should be noted that the heat exchange channel in the heat exchange plate can be used to accommodate a 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 this exemplary embodiment, the heat exchange plate can both cool the battery and heat the battery. For example, when the temperature of the battery is high, the heat exchange plate can cool the battery to improve the safety and stability of the battery pack; when the battery is in an extremely cold environment and its normal use is affected by the low temperature, the heat exchange plate can heat the battery so that the battery pack can adapt to more usage environments.

[0033] In this exemplary embodiment, Figure 1-5As shown, 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 layer 21 can be firstly compounded to form a composite layer, and then the composite layer can be subjected to a process such as stamping to form a groove on the composite layer. In this exemplary embodiment, x / g is set to a suitable size, so that the protective layer 22 and the main layer 21 can be compounded and the subsequent stamping process can be facilitated.

[0034] In this exemplary embodiment, the protective layer 22 and the main body layer 21 may be compounded by a hot rolling or cold rolling process to form the second side plate 2 .

[0035] In this exemplary embodiment, Figure 1-5 As shown, x may be 0.125-1.2, for example, x may 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 a suitable size, which can prevent the heat exchange plate from being too heavy and the main body layer 21 from being corroded.

[0036] In this exemplary embodiment, Figure 1-5 As shown, the side of the groove 3 includes an arc area 311, the second side plate 2 includes a straight portion 25 outside the groove 3, the center axis of the arc area 311 is parallel to the straight portion 25, and the center angle α of the arc area 311 is 105°-120°. For example, the center angle of the 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 center angle of the arc area 311 is too large, the inclination of the groove side relative to the groove bottom surface 32 is relatively gentle. 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 center angle of the arc area 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 central angle of the arc area 311 is set to a suitable size, which can facilitate the stamping of the second side plate and prevent the groove 3 from occupying too much space of the second side plate 2. The central axis of the arc area 311 is a straight line passing through the center of the arc area 311 and parallel to the arc area 311.

[0037] In this exemplary embodiment, Figure 1-5As shown, the radius of curvature of the arc area 311 is greater than or equal to 2 mm. For example, the radius of curvature of the arc area 311 can be equal to 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 area 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 area 311 is set larger, so that the main layer 21 and the protective layer 22 can be stamped and formed synchronously.

[0038] like Figure 1-5 As shown, the side of the groove 3 includes two arc areas 311, one arc area 311 is connected to the bottom surface 32 of the groove, and the other arc area 311 is connected to the straight side surface of the second side plate located outside the groove and facing the first side plate. The two arc areas 311 can be directly connected, or they can be connected through a plane area.

[0039] In this exemplary embodiment, Figure 1-5 As shown, d / g is 1.6-6.7, and d / g can be equal to 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. If d / g is too large, the amount of material used in the second side plate 2 will increase, and the cost will increase; if d / g is too small, the resistance along the heat exchange channel 7 will increase, thereby affecting the flow resistance performance of the entire heat exchange plate. In this exemplary embodiment, d / g is set to a suitable size, which can not only reduce the amount of material used in the second side plate 2, but also ensure the flow resistance performance of the heat exchange plate.

[0040] In this exemplary embodiment, Figure 1-5 As shown, g can be 0.7-1.2, for example, g can be equal to 0.7, 0.8, 0.9, 1, 1.1, 1.2, etc. 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, the second side plate is easily damaged. In this exemplary embodiment, g is set to a suitable size, which can ensure the strength of the heat exchange plate and also avoid the excessive weight of the heat exchange plate.

[0041] In this exemplary embodiment, Figure 1-5As shown, the first side plate 1 and the second side plate 2 can be welded by a brazing process. Accordingly, the heat exchange plate may also include: a welding layer 4, the welding layer 4 is welded between the first side plate 1 and the second side plate 2, the melting point of the welding layer 4 is lower than the melting point of the protective layer 22, and or, the melting point of the welding layer 4 is lower than the melting point of the first side plate 1. This exemplary embodiment welds the first side plate 1 and the second side plate 2 by a brazing material with a lower melting point. This setting can not only improve the welding efficiency of the first side plate 1 and the second side plate 2, but also prevent the protective layer 22 from being welded through.

[0042] In this exemplary embodiment, Figure 1-5 As shown, the material of the welding layer 4 can be 4-series aluminum. 4-series aluminum has a lower melting point.

[0043] In this exemplary embodiment, Figure 1-5 As shown, 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 high 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.

[0044] It should be understood that in other exemplary embodiments, the welding layer 4, the protective layer 22, and the first side plate 1 may also be other series of aluminum structures or aluminum alloy structures.

[0045] In this exemplary embodiment, the aluminum alloy material may be an aluminum-magnesium alloy, an aluminum-manganese alloy, or other material containing aluminum. Steel is a general term for an iron-carbon alloy with a carbon content of 0.02% to 2.11% by mass. The chemical composition of steel can vary greatly, and it contains a small amount of manganese, phosphorus, silicon, sulfur, and other elements. In actual production, steel often contains different alloying elements, such as manganese, nickel, vanadium, etc., depending on the purpose.

[0046] In this exemplary embodiment, Figure 1-5 As shown, the first side plate 1 can be a flat plate structure, the thickness of the first side plate 1 is a millimeter, the thickness of the main layer 21 outside the groove 3 is b millimeters, and a / b is 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 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 easily damaged when the battery is depressurized. In this exemplary embodiment, a / b is set to a suitable size, which can ensure the overall strength of the heat exchange plate.

[0047] The area of ​​the second side plate 2 outside the groove 3 is the area parallel to the first side plate.

[0048] In this exemplary embodiment, an insulating anti-corrosion layer and other structures may also be provided on the first side plate 1 .

[0049] The present exemplary embodiment also provides a battery device, which may include the above-mentioned heat exchange plate.

[0050] like Figure 6 , which is a schematic structural diagram of an exemplary embodiment of a battery device disclosed in the present invention. The battery device further includes a battery 5 , which is located on a side of the first side plate 1 away from the second side plate 2 .

[0051] In the present exemplary embodiment, the thickness of the first side plate 1 is 1 mm-3 mm. For example, the thickness of the first side plate 1 may be 1 mm, 2 mm, 3 mm, or the like.

[0052] 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, in order to further improve the overall strength of the battery device, the battery device may also be provided with a bottom guard plate.

[0053] like Figure 7 , which is a schematic structural diagram of another exemplary embodiment of the battery device disclosed in the present invention. The battery device includes a battery box 6 , the battery box 6 includes a bottom plate, and the bottom plate of the battery box 6 can be reused as the first side plate 1 .

[0054] It should be noted that a battery includes a cell and an electrolyte, and a battery is the smallest unit capable of performing electrochemical reactions such as charge / discharge. A cell refers to a unit formed by winding or laminating a stacked portion, wherein the stacked portion includes a first pole sheet, a separator, and a second pole sheet. When the first pole sheet is a positive pole sheet, the second pole sheet is a negative pole sheet. The polarities of the first pole sheet and the second pole sheet can be interchanged. The first pole sheet and the second pole sheet are coated with an active material.

[0055] 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.

[0056] 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.

[0057] 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.

[0058] The battery may be a wound battery, that is, a first pole piece, a second pole piece having electrical properties opposite to the first pole piece, and a diaphragm sheet arranged between the first pole piece and the second pole piece are wound to obtain a winding core.

[0059] In this exemplary embodiment, the battery device is a battery module or a battery pack.

[0060] The battery module includes a plurality of batteries, which may be square batteries, and the battery module may further include end plates and side plates, which are used to fix the plurality of batteries. The batteries may be cylindrical batteries, which may be arranged on a support plate to form a battery module.

[0061] The battery pack includes a plurality of batteries and a box body, and the box body is used to fix the plurality of batteries.

[0062] It should be noted that the battery pack includes a battery, and the battery may be multiple, and the multiple batteries are arranged in the box. Among them, the multiple batteries can be installed in the box after forming a battery module. Alternatively, the multiple batteries can be directly arranged in the box, that is, there is no need to group the multiple batteries, and the box is used to fix the multiple batteries.

[0063] It should be noted that the battery device proposed in the utility model can be used in various electrical devices, such as mobile phones, portable devices, laptops, various vehicles (such as battery cars, electric cars, etc.), ships, spacecraft, electric toys and electric tools, etc. Further, the above-mentioned spacecraft may include, for example, airplanes, rockets, space shuttles and spacecrafts. The above-mentioned electric toys may include, for example, fixed or mobile electric toys (such as game consoles, electric car toys, electric ship toys and electric airplane toys, etc.). The above-mentioned electric tools may include, for example, metal cutting electric tools, grinding electric tools, assembly electric tools and railway electric tools, specifically, for example, electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators and electric planers. It should be understood that in various possible embodiments that conform to the design concept of the utility model, the cylindrical battery or battery device proposed in the utility model is not limited to the above-described devices, but can also be applied to all devices using batteries. For the sake of simplicity, the various embodiments in this specification are described by taking vehicles as an example.

[0064] The “parallel” mentioned in this application can not only be completely parallel, but also have a certain error; for example, if the angle between the two is greater than or equal to 0° and less than or equal to 5°, the two are considered to be parallel to each other.

[0065] Those skilled in the art will readily appreciate other embodiments of the present disclosure after considering the specification and practicing what is disclosed herein. This application is intended to cover any variations, uses, or adaptations of the present disclosure that follow the general principles of the present disclosure and include common knowledge or customary technical means in the art that are not disclosed in the present disclosure. The specification and embodiments are to be considered merely as exemplary, and the true scope and spirit of the present disclosure are indicated by the claims.

[0066] The drawings in the present disclosure only relate to the structures involved in the present disclosure, and other structures may refer to the usual design. In the absence of conflict, the embodiments of the present disclosure and the features in the embodiments may be combined with each other to obtain new embodiments. It should be understood by those of ordinary skill in the art that the technical solutions of the present disclosure may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present disclosure, and should be included in the scope of the claims of the present disclosure.

[0067] It should be understood that the present disclosure is not limited to the exact structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims

1. A heat exchange plate, characterized in that: The heat exchange plate comprises: A first side plate (1), wherein the first side plate (1) is an aluminum structure or an aluminum alloy structure; a second side plate (2), wherein a large surface of the second side plate (2) is arranged opposite to a large surface of the first side plate (1), and a groove (3) for forming a heat exchange channel (7) is formed on a side of the second side plate (2) facing the first side plate (1); 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) outside the groove (3) is g millimeters, the depth of the groove (3) is d millimeters, the thickness of the protective layer (22) outside the groove (3) is x millimeters, and x×0.01×(1-(4.55d-5.36))>λ×g; Here, λ is equal to 10%.

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: x / g is 0.1-1.

72.

5. The heat exchange plate according to claim 1, characterized in that: The side surface of the groove (3) includes an arc area (311), and the second side plate (2) includes a straight portion (25) located outside the groove (3). The central axis of the arc area (311) is parallel to the straight portion (25), and the central angle of the arc area (311) is 105°-120°.

6. The heat exchange plate according to claim 1, characterized in that: The side surface of the groove (3) includes an arc area (311), the second side plate (2) includes a straight portion (25) located outside the groove (3), the central axis of the arc area (311) is parallel to the straight portion (25), and the radius of curvature of the arc area (311) is greater than or equal to 2 mm.

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

7.

8. The heat exchange plate according to any one of claims 1 to 7, characterized in that: The heat exchange plate also includes: A welding layer (4) is welded between the first side plate (1) and the second side plate (2), the melting point of the welding layer (4) is lower than the melting point of the protective layer (22), and / or the melting point of the welding layer (4) is lower than the melting point of the first side plate (1).

9. The heat exchange plate according to claim 8, characterized in that: The material of the welding layer (4) is 4 series aluminum.

10. The heat exchange plate according to any one of claims 1 to 7, characterized 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.

11. The heat exchange plate according to any one of claims 1 to 7, characterized 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) outside the groove (3) is b millimeters, and a / b is 0.1-9.

12. A battery device, characterized in that: The battery device comprises the heat exchange plate according to any one of claims 1-11.

13. The battery device according to claim 12, characterized in that: The battery device further comprises a battery (5), wherein the battery (5) is located on a side of the first side plate (1) facing away from the second side plate (2).

14. The battery device according to claim 13, characterized in that: The thickness of the first side plate (1) is 1 mm to 3 mm.

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