Heat distribution plate, battery and battery module

Abstract

Heat distribution plate (100) comprising: a plate (101) in which an internal cavity (102) is formed, wherein the plate (101) comprises a first plate body (103) and a second plate body (104) arranged opposite the first plate body (103), wherein the first plate body (103) and the second plate body (104) enclose at least a part of the internal cavity (102); and a reinforcing structure (105) provided on the first plate body (103) and located within the inner cavity (102); wherein a compressive strength of the heat distribution plate (100) is greater than or equal to 2.5 MPa.

Description

Technical area

[0001] The present application relates to the field of battery technology, in particular to a heat distribution plate, a battery and a battery module. State of the art

[0002] A heat distribution plate is a phase-change heat transfer element that utilizes the latent heat of the phase change in the working fluid to dissipate heat, making it a promising thermal management method for solving product and equipment heat dissipation problems. Currently, the heat distribution plate is mainly used for heat dissipation of electronic devices. It features excellent thermal conductivity, a large heat transfer area, and good temperature distribution performance. In particular, the heat distribution plate has an ultra-thin thickness, and the outer dimensions can be customized according to actual heat dissipation needs. Disclosure of the application

[0003] In related technologies, the heat distribution plate is used in batteries. The battery expands due to temperature rises during operation. The thickness of the heat distribution plate is relatively thin, and its external pressure-bearing capacity and internal expansion resistance are weak, making the heat distribution plate prone to bending deformation or even fracture. Although the reinforcement structure on the outer surface of the heat distribution plate can increase the strength of the heat distribution plate, it leads to an increase in the overall size of the battery.

[0004] In a first aspect, the present application provides a heat distribution plate. The heat distribution plate comprises: a plate in which an internal cavity is formed, the plate comprising a first plate body and a second plate body arranged opposite the first plate body, the first plate body and the second plate body enclosing at least a part of the internal cavity; and a reinforcing structure provided on the first plate body and located within the inner cavity; wherein the compressive strength of the heat distribution plate is greater than or equal to 2.5 MPa.

[0005] In a second aspect, the present application further provides a battery. The battery includes the heat distribution plate.

[0006] In a third aspect, the present application further provides a battery module. The battery module comprises the heat distribution plate or the battery. Beneficial effects

[0007] The heat distribution plate includes a plate with an internal cavity formed therein. The reinforcement structure is arranged in the internal cavity and can support the plate and increase the structural strength of the plate, thereby improving the compressive strength and expansion resistance of the heat distribution plate, preventing bending deformation or breakage of the heat distribution plate, and extending the service life of the heat distribution plate. At the same time, the reinforcement structure is provided in the internal cavity, which does not occupy additional space and does not affect the overall size of the battery. Furthermore, the compressive strength of the heat distribution plate is greater than or equal to 2.5 MPa, which can solve the extrusion deformation of the heat distribution plate due to battery expansion and improve the service life of the heat distribution plate. Brief description of the drawings Fig. 1 is a schematic structural diagram of a heat distribution plate according to some embodiments of the present application; Fig. 2 is a full section diagram of a heat distribution plate in Fig. 1; Fig. 3 is an enlarged schematic diagram of A in Fig. 2; Fig. 4 is a schematic structural diagram of a first plate body in Fig. 1 according to some embodiments; Fig. 5 is a schematic structural diagram of a first plate body in Fig. 4 from a different perspective; Fig. 6 is a schematic structural diagram of a first plate body in Fig. 1 according to some other embodiments; Fig. 7 is a schematic structural diagram of a first plate body in Fig. 1 according to some other embodiments; Fig. Figure 8 is a full section diagram of a plate in Fig. 1; Fig. 9 is a full section diagram of a heat distribution plate in Fig. 1 from a different perspective; Fig. 10 is an enlarged schematic diagram of A0 in Fig. 9; Fig. 11 is a schematic structural diagram of a plate in Fig. 1 according to some embodiments; Fig. 12 is an enlarged schematic diagram of B0 in Fig. 11; Fig. 13 is a schematic structural diagram of a heat distribution plate according to some embodiments of the present application; Fig. 14 is a schematic structural diagram of a heat distribution plate according to some other embodiments of the present application; Fig. 15 is a schematic structural diagram of a heat distribution plate according to still some embodiments of the present application. Fig. 16 is a schematic structural diagram of a first plate body in Fig. 1 according to some other embodiments; Fig. Figure 17 is an enlarged schematic diagram of C0 in Fig. 16; Fig. 18 is a schematic structural diagram of a second plate body in Fig. 1 according to some embodiments; Fig. 19 is an enlarged schematic diagram of D0 in Fig. 18; Fig. 20 is a sectional diagram of a heat distribution plate in Fig. 1 according to some other embodiments; Fig. Figure 21 is an enlarged schematic diagram of E0 in Fig. 20; Fig. Figure 22 is an enlarged schematic diagram of F0 in Fig. 21. Reference symbol:

[0008] 100: Heat distribution plate; 101: Plate; 102: Internal cavity; 103: First plate body; 104: Second plate body; 105: Reinforcing structure; 106: Reinforcing rib assembly; 107: Reinforcing rib row; 108: First reinforcing rib; 109: Second reinforcing rib; 110: First part; 111: Second part; 112: Third part; 113: Third reinforcing rib; 114: Liquid absorption core; 115: Liquid absorption core mounting channel; 116: Wire mesh; 117: First support row; 118: First support column; 119: Support mounting channel; 120: Second support row; 121: Support gap; 122: Liquid inlet; 123: Second support column; 124: Support structure; 106a: Core material layer; 107a: Protective layer; 108a: Bottom plate; 109a: Side plate; 110a: Mounting plate; 111b: First receiving slot; 112b: First connecting wall; 121b: Second receiving slot; 122b: Second connecting wall; 21: First groove; 211: First side edge; 212: Second side edge; 22: Protrusion; 23: Receiving cavity. Detailed embodiments

[0009] In related technologies, the heat distribution plate 100 is applied in batteries. The battery expands due to the temperature rise during operation. The thickness of the heat distribution plate 100 is relatively thin, and its external pressure-bearing capacity and internal expansion resistance are weak, making the heat distribution plate prone to bending deformation or even breakage. Although the reinforcement structure 105 on the outer surface of the heat distribution plate 100 can increase the strength of the heat distribution plate 100, it results in an increase in the overall size of the battery.

[0010] In view of this, the present application proposes a heat distribution plate 100. Fig. 1 to Fig. 22 are schematic structural diagrams of the heat distribution plate 100 according to the embodiments of the present application. The heat distribution plate 100 of the present application has strong compressive strength, strong expansion resistance, and does not affect the overall size of the battery. A detailed explanation of the heat distribution plate 100 is provided below in conjunction with the main figures.

[0011] With reference to Fig. 1, Fig. 2 and Fig. 3, the heat distribution plate 100 comprises a plate 101 and a reinforcing structure 105. An internal cavity 102 is formed in the plate 101, and a working fluid configured for heat transfer is formed in the internal cavity 102. The plate 101 comprises a first plate body 103 and a second plate body 104 arranged opposite the first plate body 103. The first plate body 103 and the second plate body 104 enclose at least part of the internal cavity 102. The reinforcing structure 105 is provided on the first plate body 103 and is located in the internal cavity 102; the compressive strength of the heat distribution plate 100 is greater than or equal to 2.5 MPa.

[0012] The heat distribution plate 100 of the present application is applied to the battery casing, has a simple structure, low manufacturing cost, and efficient thermal diffusivity. The heat distribution plate 100 includes a plate 101 in which an internal cavity 102 is formed. A plurality of reinforcing structures 105 are arranged in the internal cavity 102 to support the plate and enhance the structural strength of the plate 101, thereby improving the compressive strength and expansion resistance of the heat distribution plate 100, improving the structural strength of the heat distribution plate 100, preventing bending deformation or breakage of the heat distribution plate 100, and improving the service life of the heat distribution plate 100. At the same time, a plurality of reinforcing structures 105 are provided in the internal cavity 102, which does not occupy additional space and does not affect the overall size of the battery.In addition, the compressive strength of the heat distribution plate 100 is greater than or equal to 2.5 MPa, which can solve the extrusion deformation of the heat distribution plate 100 due to the expansion of battery in related technologies, and improve the service life of the heat distribution plate 100.

[0013] In some embodiments, the first plate body 103 is a lower shell plate, and the second plate body 104 is an upper shell plate. The upper shell plate and the lower shell plate are each formed with a first receiving slot 111b and a second receiving slot 121b. The upper shell plate and the lower shell plate are welded together so that the first receiving slot 111b and the second receiving slot 121b can communicate and form an internal cavity 102. It should be noted that the specific position of the reinforcing structure 105 is not limited as long as it can be located in the internal cavity 102. In some embodiments, the reinforcing structure 105 is provided on the first plate body 103. Of course, the reinforcing structure 105 can also be provided on the second plate body 104, and a selection thereof can be made according to the actual situation.Since the first plate body 103 is the lower shell plate, providing the reinforcing structure 105 on the first plate body 103 is more convenient for the welding connection between the first plate body 103 and the second plate body 104.

[0014] The welding method for the first plate body 103 and the second plate body 104 is not limited and may be brazing, laser penetration welding, resistance welding, etc. The selection may be based on the specific materials of the first plate body 103 and the second plate body 104. For example, in some embodiments, when the material of the first plate body 103 and the second plate body 104 is stainless steel, the first plate body 103 and the second plate body 104 are welded by laser penetration welding. In other embodiments, when the material of the first plate body 103 and the second plate body 104 is aluminum alloy or copper alloy, the first plate body 103 and the second plate body 104 are welded by brazing using solder paste or magnesium alloy welding wire as the filler metal.In other embodiments, when the material of the first plate body 103 and the second plate body 104 is aluminum alloy, the first plate body 103 and the second plate body 104 are welded by resistance welding with aluminum alloy welding wire as a filler metal.

[0015] With reference to Fig. 4 and Fig. 5, the specific type of the reinforcing structure 105 is not limited as long as it can meet the compressive strength of the heat distribution plate 100. In this embodiment, the reinforcing structure 105 includes a plurality of reinforcing rib assemblies 106 arranged at intervals along a width direction of the plate. Each reinforcing rib assembly 106 includes a plurality of reinforcing rib rows 107 arranged at intervals along the width direction of the plate. In some embodiments, each reinforcing rib row 107 includes a plurality of first reinforcing ribs 108 extending along a length direction of the plate 101. And the plurality of reinforcing rib rows 107 are arranged at intervals along the length direction of the plate 101. In the width direction of the plate 101, the adjacent two first reinforcing ribs 108 are in head-to-tail correspondence, so that a plurality of first reinforcing ribs 108 are arranged in an array.It should be noted that a plurality of first reinforcing ribs 108 are arranged in an array and evenly distributed on the first plate body 103, which can improve the uniformity of the force on the plate 101, so that the structural strength at any point of the plate 101 is basically the same, thereby improving the overall structural strength of the plate 101, avoiding the situation of local force deformation of the heat distribution plate 100 due to insufficient local strength, and improving the service life of the heat distribution plate 100.

[0016] In some embodiments, each reinforcing rib row 107 includes a plurality of evenly spaced first reinforcing ribs 108. In some embodiments, the distance between adjacent two first reinforcing ribs 108 in the length direction of the plate 101 is the same. In other embodiments, the distance between adjacent two first reinforcing ribs 108 increases or decreases in the length direction of the plate 101. The specific adjustment method can be selected depending on the actual situation, and there are no limitations.

[0017] Due to the different application environments of the heat distribution plate 100, the action forces or expansion forces acting on the respective locations of the heat distribution plate 100 are also different. With reference to Fig. 4 and Fig. 5, in this embodiment, each reinforcing rib row 107 further includes second reinforcing ribs 109, and the plurality of second reinforcing ribs 109 are arranged in an array. The length of at least one second reinforcing rib 109 is shorter than the length of at least one first reinforcing rib 108. The length of the second reinforcing rib 109 is shorter than that of the first reinforcing rib 108. The first reinforcing rib 108 can be applied to areas with greater force, while the second reinforcing rib 109 can be applied to areas with lesser force. The first reinforcing rib 108 and the second reinforcing rib 109 are reasonably assigned to provide the space utilization rate.

[0018] Generally, the battery case has six housing surfaces, and the heat distribution plate 100 can be applied to each housing surface of the battery case or can be applied to multiple housing surfaces at the same time. For example, the heat distribution plate 100 can be applied to two adjacent housing surfaces of the battery case. When the heat distribution plate 100 is applied to the adjacent two housing surfaces of the battery case, two independent heat distribution plates 100 can be placed on the two housing surfaces of the battery case, and then the two heat distribution plates 100 are connected by welding, etc. In another embodiment and related to Fig. 6, a heat distribution plate 100 is bent so that it can serve as two housing surfaces of the battery case. Specifically, the selection can be made according to the size of the battery.

[0019] In some other embodiments, the heat distribution plate 100 can also be used as a cooling plate. The battery includes a battery casing and a cell pack assembly. The cell pack assembly is mounted in the battery casing. The heat distribution plate 100 is mounted between the cell pack assembly and the battery casing and is used to cool the cell pack. The cell pack assembly further includes a plurality of cell pack rows arranged at intervals. The heat distribution plate 100 can also be arranged between adjacent two cell pack rows, thereby achieving cooling of the plurality of sides, increasing cooling efficiency, and preventing thermal runaway.

[0020] In order for the heat distribution plate 100 to meet various application scenarios in some embodiments, in this embodiment, the first plate body 103 further comprises a first part 110, a second part 111, and a third part 112. The second part 111 is connected between the first part 110 and the third part 112, and the first part 110, the second part 111, and the third part 112 are integrally formed. A plurality of first reinforcing ribs 108 are provided in the first part 110, and a plurality of second reinforcing ribs 109 are provided in the third part 112. The second part 111 can be bent. For example, with reference to Fig. 4, in one embodiment, when the heat distribution plate 100 is applied to a specific housing surface of the battery housing, the second part 111 is a flat plate, and the first part 110, the second part 111, and the third part 112 are on the same plane. In another embodiment, see Fig. 6, the heat distribution plate 100 is applied to two adjacent housing surfaces of the battery case. The second part 111 is bent, and the second part 111 is a bending plate. The first part 110 and the third part 112 are located on different planes.

[0021] In some embodiments, when the first part 110 and the third part 112 are located on the same plane, the heat distribution plate 100 has a "L"-shaped structure. When the first part 110 and the third part 112 are located on different planes, the heat distribution plate 100 has an "L"-shaped structure. By joining two "L"-shaped heat distribution plates 100 together, a "T"-shaped heat distribution plate 100 can be formed. The selection can be made according to the actual situation.

[0022] In some embodiments, when the second part 111 is a bending plate, the angle at which the second part 111 is bent is α, which is 90° to 95°. In one embodiment, α is 90°.

[0023] In some embodiments, the reinforcement structure 105 further includes a third reinforcement rib 113 extending along the width direction of the plate 101 and provided in the second part 111. The function of the third reinforcement rib 113 is to improve the structural strength of the second part 111. When the second part 111 is a bending plate, it is necessary to bend the heat distribution plate 100. The third reinforcement rib 113 can improve the structural strength of the heat distribution plate 100 and prevent the heat distribution plate 100 from breaking during the bending process.

[0024] In some embodiments and with respect to Fig. 1, the heat distribution plate 100 further includes a plurality of fluid absorption cores 114 extending along the length direction of the plate 101 and spaced apart in the inner cavity 102 along the width direction of the plate 101. A fluid absorption core mounting channel 115 is formed between adjacent two reinforcing rib assemblies 106, and the fluid absorption core mounting channel 115 extends along the length direction of the plate 101. The fluid absorption core mounting channel 115 is configured to mount the fluid absorption core 114. The fluid absorption core 114 can absorb the working fluid and diffuse the working fluid into the inner cavity 102, so that the inner cavity 102 is filled with the working fluid and the heat dissipation ability is improved.

[0025] In some embodiments, the width of the mounting channel for the fluid absorption core 115 is 14 mm to 20 mm. The width of the mounting channel for the fluid absorption core 115 may be 14 mm, 15 mm, 16 mm, 17 mm, 18 mm, 19 mm, or 20 mm.

[0026] In some embodiments, please continue to refer to Fig. 1, the heat distribution plate 100 further includes a mesh wire 116 provided in the interior cavity 102 and located above the plurality of liquid receiving cores 114.

[0027] In some embodiments, the reinforcing structure 105 further includes a support structure 124, and the support structure 124 includes a plurality of first support rows 117. Each first support row 117 includes a plurality of first support columns 118, the plurality of first support columns 118 are located in the interior cavity 102, one end of the support columns is connected to the first plate body 103, the other end of the support columns is connected to the second plate body 104, and the plurality of support columns are used to support the first plate body 103 and the second plate body 104. In some embodiments, in the same reinforcing rib assembly 106, a support mounting channel 119 is provided between adjacent two reinforcing rib rows 107, and the support mounting channel 119 is configured to mount a plurality of first support rows 117.In this way, the first support row 117 and the first reinforcing rib 108 do not influence each other, and the space utilization rate is relatively high.

[0028] It should be noted that in order to avoid interference during the assembly of the liquid absorption core 114, a plurality of first support columns 118 are not provided in the assembly channel for the liquid absorption core 115.

[0029] In some embodiments, adjacent two first support rows 117 are offset from each other in the same support mounting channel 119. The adjacent two first support rows 117 are the first support row a and the first support row b. The first support row a includes a plurality of first support columns a, and the first support row b includes a plurality of first support columns b. The center of the adjacent two first support columns a corresponds to a first support column b. In this way, the compressive strength of the heat distribution plate 100 can be improved.

[0030] In some embodiments, the first reinforcing rib 108 and the second reinforcing rib 109 are generally provided in the center of the first plate body 103, resulting in weaker strength at the edge position of the first plate body 103. To improve the structural strength at the edge position of the first plate body 103, the reinforcing structure 105 further includes a plurality of second support rows 120 and a plurality of support gaps 121, and the plurality of second support rows 120 and the plurality of support gaps 121 surround the plurality of reinforcing rib assemblies 106. In this embodiment, two second support rows 120 and two second support gaps 121 are provided. The two second support rows 120 are provided on both sides of the reinforcing structure 105 along the width direction of the plate 101, and the two support gaps 121 are provided on both sides of the reinforcing structure 105 along the length direction of the plate 101.

[0031] In this embodiment, each second support row 120 includes a plurality of second support columns 123. Note that due to the limited space at the edge position of the first plate body 103 for placing more second support columns 123, the density of a plurality of second support columns 123 in the second support row 120 is denser. The distribution density of a plurality of first support columns 118 is smaller than the distribution density of a plurality of second support columns 123.

[0032] In some embodiments, a plurality of first support columns 118 are arranged regularly. In some other embodiments, a plurality of first support columns 118 are arranged irregularly. It should be noted that, although a plurality of first support columns 118 are arranged irregularly, in consideration of the need to mount the liquid absorption core 114 in the liquid absorption core mounting channel 115 to avoid interference during the mounting of the liquid absorption core 114, a plurality of first support columns 118 are not provided in the liquid absorption core mounting channel 115.

[0033] In some embodiments, a plurality of through holes corresponding to the first support pillars 118 are formed on the mesh 116, and the first support pillars 118 pass through the through holes and are connected to the second plate body 104. In this way, the first support pillars 118 can also fix the mesh 116 and improve the structural stability of the heat distribution plate 100. The diameter of the through hole is 10 mm to 15 mm, and the diameter of the through hole can be 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, 15 mm, or other data not listed.

[0034] In some embodiments, the diameter of the first support column 118 is 1 mm to 3 mm. The diameter of the first support column 118 may be 1 mm, 1.2 mm, 1.5 mm, 1.6 mm, 1.8 mm, 2 mm, 2.1 mm, 2.3 mm, 2.4 mm, 2.5 mm, 2.7 mm, 2.9 mm, 3 mm, or other data not listed. When multiple first support columns 118 are regularly arranged, a distance between the axes of adjacent two first support columns 118 is 4 mm to 8 mm. The distance between the axes of adjacent two first support columns 118 may be 4 mm, 4.2 mm, 4.5 mm, 4.7 mm, 4.8 mm, 5 mm, 5.1 mm, 5.4 mm, 5.5 mm, 5.9 mm, 6 mm, 6.6 mm, 6.9 mm, 7 mm, 7.1 mm, 7.2 mm, 7.3 mm, 7.8 mm, 8 mm or other data not listed.

[0035] In some embodiments, the sum of the areas of the positive projections of the reinforcement structure 105 onto the first plate body 103 is S1, and the cross-sectional area of ​​the internal cavity 102 is S2, where (1:124) ≤ (S1 / S2) ≤ (0.5:1). It should be noted that when S1 / S2 is less than 1 / 124, the number of reinforcement structures 105 is relatively small, resulting in lower structural strength of the heat distribution plate 100, which is prone to deformation or even breakage during use. When S1 / S2 is greater than 0.5, the reinforcement structure 105 occupies a larger volume of the internal cavity 102, resulting in less working fluid in the internal cavity 102 and lower cooling efficiency of the heat distribution plate 100.

[0036] In some embodiments and with respect to Fig. 5, the length of the heat distribution plate 100 is L1, and the length of each first reinforcing rib 108 is L2, where L2 / L1 = (0.1 ∼ 0.7): 1. It should be noted that the length of the first reinforcing rib 108 should not be too long or too short. If L2 / L1 is less than 0.1, the length of the first reinforcing rib 108 is too short. In order to meet the structural strength of the heat distribution plate 100, the number of first reinforcing ribs 108 increases accordingly, resulting in increased manufacturing difficulty and manufacturing costs. If L2 / L1 is greater than 0.7, the length of the first reinforcing rib 108 increases, which in turn leads to increased manufacturing difficulty and manufacturing costs.

[0037] In some embodiments, please refer to Fig. 5. The width of the plate 101 is H1, and the width of each first reinforcing rib 108 is H2, where H2 / H1 = (0.01 ∼ 0.5) : 1. It should be noted that the width of the first reinforcing rib 108 should not be too long or too short. If H2 / H1 is less than 0.01, the width of the first reinforcing rib 108 is too short. In order to meet the structural strength of the heat distribution plate 100, the number of first reinforcing ribs 108 increases accordingly, resulting in increased manufacturing difficulty and cost. If H2 / H1 is greater than 0.1, the width of the first reinforcing rib 108 increases, which in turn results in increased manufacturing difficulty and cost.

[0038] In some embodiments, please refer to Fig. 5. The length of each second reinforcing rib 109 is L3, where L3 / L1 = (0.1 ∼ 0.2): 1. It should be noted that the width of the second reinforcing rib 109 should not be too long or too short. If L3 / L1 is less than 0.1, the width of the second reinforcing rib 109 is too short. In order to meet the structural strength of the heat distribution plate 100, the number of second reinforcing ribs 109 increases accordingly, resulting in increased manufacturing difficulty and cost. If L2 / L1 is greater than 0.2, the width of the second reinforcing rib 109 increases, which in turn leads to increased manufacturing difficulty and cost.

[0039] In some embodiments and with respect to Fig. 5, the width of the plate 101 is H1, and the width of each second reinforcing rib 109 is H3, where H3 / H1 = (0.01 ∼ 0.5):1. It should be noted that the width of the second reinforcing rib 109 should not be too long or too short. If H3 / H1 is less than 0.01, the width of the second reinforcing rib 109 is too short. In order to meet the structural strength of the heat distribution plate 100, the number of second reinforcing ribs 109 increases accordingly, resulting in increased manufacturing difficulty and cost. If H3 / H1 is greater than 0.1, the width of the second reinforcing rib 109 increases, which in turn results in increased manufacturing difficulty and cost.

[0040] In some embodiments and with respect to Fig. 1, a liquid inlet 122 is further formed on the heat distribution plate 100, which is in communication with the inner cavity 102 for introducing the working liquid into the inner cavity 102.

[0041] It should be noted that the specific material of the heat distribution plate 100 is not limited and can be selected according to the actual situation. In some embodiments, the heat distribution plate 100 comprises a stainless steel heat distribution plate 100, and the specific material model is SUS. The stainless steel heat distribution plate 100 has higher strength, stronger deformation resistance, and stronger thermal conductivity.

[0042] In one embodiment, a mold is used to remove materials on the first plate body 103 by etching and other methods to manufacture the first reinforcing rib 108, the second reinforcing rib 109, the third reinforcing rib 113, the first support pillar 118, and the second support pillar 123, which can increase the structural strength and deformation resistance of the heat distribution plate 100.

[0043] In another embodiment, please refer to Fig. 7, the outer side of the first plate body 103 facing away from the inner cavity 102 is recessed, and the inner side of the first plate body 103 facing the inner cavity 102 protrudes, thereby forming the reinforcement structure 105. Place the first plate body 103 on the punching machine, align the punching head with the outer side of the first plate body, and punch the first plate body from the outer side to the inner side to form the reinforcement structure 105 on the first plate body 103. In this way, the material can be saved.

[0044] In this embodiment, please refer further to Fig. 7. The reinforcement structure 105 is integrally formed by stamping, that is, the first plate body 103 is placed on the stamping machine, and the first reinforcement rib 108, the second reinforcement rib 109, the third reinforcement rib 113, the first support column 118, and the second support column 123 are each stamped onto the first plate body by the stamping machine. The molding process is simple and raw materials are saved.

[0045] In some embodiments, at least a portion of the reinforcement structure 105 is welded to the second plate body 104, and the internal cavity 102 is formed between the first plate body 103 and the second plate body 104. The internal cavity 102 is used to contain the working fluid, so the structural strength of the area where the internal cavity 102 is formed is weak. To improve the structural strength of this portion, a plurality of first support columns 118 and a plurality of second support columns 123 are welded and connected to the second plate body 104. In this way, the first plate body 103 and the second plate body 104 are supported by a plurality of first support columns 118 and a plurality of second support columns 123, thereby improving the structural strength of the heat distribution plate 100.In addition, the use of the welding process facilitates automated production and improves production efficiency.

[0046] It should be noted that in the relevant technology, the heat distribution plate 100 includes an upper shell and a lower shell, and the internal cavity 102 is formed between the lower shell and the upper shell. The working fluid is formed in the internal cavity 102, and the upper shell and the lower shell are generally made of copper, which leads to easy corrosion of the upper shell and the lower shell and a reduced service life of the heat distribution plate 100. To avoid this problem, in some embodiments, please refer to Fig. 1 and Fig. 8. The heat distribution plate 100 includes a plate 101 formed with an internal cavity 102 in which a working fluid for heat transfer is formed. The plate 101 includes two plate bodies arranged opposite one another along the first direction. At least one plate body includes a core material layer 106a and a protective layer 107a located on at least one side of the core material layer 106a in the first direction. The thickness of the core material layer 106a is B1, and the thickness of the protective layer 107a is A1, where A1:B1 = (0.0005 ∼ 0.2):1. It features a simple structure, strong corrosion resistance, and a long service life. The plate body includes a core material layer 106a and a protective layer 107a. The protective layer 107a is provided on the core material layer 106a to protect the core material layer 106a.A dense passivation film is formed on the outer surface of the core material layer 106a to effectively prevent the core material layer 106a from reacting with other substances, thereby extending the service life of the heat distribution plate 100. The thickness of the core material layer 106a is B1, and the thickness of the protective layer 107a is A1, where A1:B1 = (0.0005 ∼ 0.2):1. Within this range, it is possible to prevent corrosion of the core material layer 106a and improve the service life of the heat distribution plate 100, while preventing excessive thickness of the heat distribution plate 100 and increasing the occupied space.

[0047] In some embodiments, the core material layer 106a comprises a stainless steel layer or a copper layer, and the protective layer 107a comprises any of a nickel layer, a chromium layer, a zinc layer, an organic coating, and a Teflon coating.

[0048] The core material layer 106a comprises a stainless steel layer and a copper layer. The stainless steel layer and the copper layer have relatively poor reactivity and generally do not react with other substances, providing good corrosion resistance. At the same time, the structural strength of the stainless steel layer and the copper layer is strong and not easily deformed, which can improve the service life of the heat distribution plate 100. At the same time, a protective layer 107a is formed on the outer surface of the core material layer 106a. The protective layer 107a includes any of a nickel layer, a chromium layer, a zinc layer, an organic coating, and a Teflon coating. The reactivity of the nickel layer, chromium layer, zinc layer, an organic coating, and a Teflon coating is poor and basically does not react with other substances. The protective layer 107a is deposited on the core material layer 106a to protect the core material layer 106a.A dense passivation film is formed on the outer surface of the core material layer 106a to effectively prevent the core material layer 106a from reacting with other substances, thereby extending the service life of the heat distribution plate 100 while improving the aesthetics of the heat distribution plate 100.

[0049] It should be noted that when A1 / B1 is less than 0.0005, the thickness of the core material layer 106a is small, resulting in a smaller thickness of the plate body, weaker structural strength of the plate body, and a smaller thickness of the protective layer 107a. During use, the working fluid, such as an electrolyte or a colloid, may easily penetrate into the core material layer 106a, resulting in corrosion of the core material layer 106a and slight damage to the heat distribution plate 100 during use, affecting the service life of the heat distribution plate 100. When A1 / B1 is greater than 0.2, the thickness of the core material layer 106a is greater, and the thickness of the protective layer 107a is also greater, resulting in an increase in the overall size of the heat distribution plate 100 and an increase in the occupied space.

[0050] In some embodiments, the thickness of the protective layer 107a is 0.001 mm to 0.05 mm. The thickness of the protective layer 107a may be 0.001 mm, 0.002 mm, 0.005 mm, 0.006 mm, 0.01 mm, 0.015 mm, 0.018 mm, 0.022 mm, 0.025 mm, 0.026 mm, 0.028 mm, 0.03 mm, 0.031 mm, 0.035 mm, 0.038 mm, 0.04 mm, 0.042 mm, 0.047 mm, 0.05 mm, or other unspecified data.

[0051] It should be noted that the positional relationship between the core material layer 106a and the protective layer 107a is not limited. In one embodiment, the working fluid is formed in the inner cavity 102 of the heat distribution plate 100. To prevent the two plate bodies from being corroded by the working fluid, the protective layer 107a is formed on the side of the two plate bodies that comes into contact with the working fluid. In this way, materials can be saved and costs can be reduced. In another embodiment, the heat distribution plate 100 is applied in a battery, and one side of the plate body must come into contact with the working fluid, while the other side of the plate body must come into contact with the electrolyte or colloid. Therefore, to prevent corrosion of the plate body, the protective layer 107a is wrapped on the outer side of the core material layer 106a.

[0052] In this embodiment, the two plate bodies are the first plate body 103 and the second plate body 104, respectively. The first plate body 103 is the lower shell plate, and the second plate body 104 is the upper shell plate. The upper shell plate and the lower shell plate are connected by welding.

[0053] In this embodiment, the protective layer 107a wraps around the core material layer 106a to improve the service life of the heat distribution plate 100. The protective layer 107a is formed on the outer surface of the core material layer 106a by vacuum ion plating. The operation of the vacuum ion plating is simple, inexpensive, and the coating is stable, so that the protective layer 107a is in close contact with the core material layer 106a, thereby forming a dense passivation film on the outer surface of the core material layer 106a. This effectively prevents the core material layer 106a from reacting with other substances, thereby extending the service life of the heat distribution plate 100. The specific operation and precautions of the vacuum ion plating may refer to the conventional settings in this field, which will not be explained in detail here.

[0054] In some embodiments, please refer to Fig. 11 and Fig. 12, each plate body includes a bottom plate 108a, a side plate 109a, and a mounting plate 110a. The side plate 109a surrounds the bottom plate 108a. The mounting plate 110a is bently connected to an end of the side plate 109a facing away from the bottom plate 108a and extends in a direction away from the bottom plate 108a. In the actual operation process, the bottom plates 108a of the two plate bodies correspond to each other, and the side plates 109a of the two plate bodies correspond to each other, and the mounting plates 110a of the two plate bodies correspond to each other. The two mounting plates 110a of the two plate bodies are connected to each other by a welding connection part. The welding connection can improve the connection strength between the two plate bodies and also improve the tightness of the heat distribution plate 100.

[0055] In this embodiment, the mounting plate 110a has oppositely disposed inner side edges and outer side edges, and the inner side edge is located on a side of the mounting plate 110a facing the inner cavity 102, and the outer side edge is located on a side of the mounting plate 110a facing away from the inner cavity 102. A welding edge is further formed on the mounting plate 110a, and the welding edge is located between the inner side edge and the outer side edge. The welding connection part is formed by welding the two mounting plates 110a at the welding edges of the mounting plates 110a. Note that the welding edge does not realistically exist. The welding edge refers to the position where welding is performed with the welding gun during the welding process (this position is the welding edge).In this embodiment, the welding gun aligns with the welding edge during welding and performs welding from the welding edge. The weld connection part refers to the location where the two mounting plates 110a are connected after welding.

[0056] The shortest distance between the welding edge and the end of the mounting plate 110a facing away from the side plate 109a is C1, where 5 mm ≤ C1 ≤ 15 mm. It should be noted that when C1 is less than 5 mm, during welding, the welding gun tilts toward the outer edge, the welding area between the two plate bodies is small, and the connection strength between the two plate bodies is insufficient. During use, the two plate bodies are prone to breakage, resulting in leakage of the working fluid in the inner cavity 102. When C1 is greater than 15 mm, the welding gun tilts toward the inner edge, and the reinforcing structure 105 is often provided in the inner cavity 102 for support.When the welding gun is positioned close to the inner side edge, the welding energy impacts the reinforcement structure 105 in the inner cavity 102 during the welding process, resulting in deformation of the reinforcement structure 105 and thus affecting the overall structural strength of the heat distribution plate 100. In this embodiment, C1 can be 5 mm, 5.5 mm, 6 mm, 6.2 mm, 6.8 mm, 7 mm, 7.7 mm, 7.9 mm, 8 mm, 8.5 mm, 8.6 mm, 8.7 mm, 9 mm, 10 mm, 11.2 mm, 12 mm, 12.5 mm, 13 mm, 14 mm, 15 mm, or other data not listed.

[0057] In this embodiment, the two plate bodies are the first plate body 103 and the second plate body 104, respectively. The first plate body 103 includes a first bottom plate 108a and a first side plate 109a, and the second plate body 104 includes a second bottom plate 108a and a second side plate 109a. The first bottom plate 108a and the first side plate 109a define a first groove, and the second bottom plate 108a and the second side plate 109a define a second groove. The first groove and the second groove communicate to form the internal cavity 102. It should be noted that the heat distribution plate 100 further includes a reinforcing structure 105 provided in one of the plate bodies and located in the internal cavity 102.The reinforcement structure 105 can support the plate body 101 and increase the structural strength of the plate body 101, thereby improving the compressive strength and expansion resistance of the heat distribution plate 100, improving the structural strength of the heat distribution plate 100, preventing bending deformation or breakage of the heat distribution plate 100, and improving the service life of the heat distribution plate 100. At the same time, the reinforcement structure 105 is provided in the internal cavity 102, which does not occupy additional space and does not affect the overall size of the battery.

[0058] In this embodiment, the first groove and the second groove are punch-formed. A board is placed on the punching die, the punching head is aligned with the area that needs to be punched, and after punching is completed, the bottom plate 108a, the side plate 109a, and the mounting plate 110a are formed on the board. Manufacturing by punch-forming can save materials, and there is no gap between the bottom plate 108a, the side plate 109a, and the mounting plate 110a, and the sealing is better.

[0059] In some embodiments, the heat distribution plate 100 further includes a plurality of liquid absorption cores 114 and a mesh 116. The plurality of liquid absorption cores 114 are located within the internal cavity 102 and are located on one of the plate bodies. The plurality of liquid absorption cores 114 extend along the length direction of the plate 101 and are spaced apart in the internal cavity 102 along the width direction of the plate 101. The mesh 116 is provided between the plurality of liquid absorption cores 114 and another plate body.

[0060] It should be noted that the specific materials of the liquid absorption core 114 and the mesh 116 are not limited and can be selected according to the actual situation. In this embodiment, the liquid absorption core 114 is a stainless steel liquid absorption core 114. The mesh 116 is a stainless steel mesh 116. Stainless steel material has strong corrosion resistance and strong structural strength and cannot be damaged. In other embodiments, the liquid absorption core 114 is a copper liquid absorption core 114, and the mesh 116 is a copper mesh 116.

[0061] In some embodiments and with respect to Fig. 9 and Fig. 10, the total thickness of the heat distribution plate 100 is H10, and the thickness of the first plate body 103 is H21, where H21:H10 = (0.01 ∼ 0.2):1. If H21 / H10 is less than 0.01, the thickness of the first plate body 103 is relatively thin, the structural strength is weak, and it is prone to damage during use. If H21 / H10 is greater than 0.2, the thickness of the first plate body 103 is relatively thick, the thermal conductivity and heat transfer performance decrease, and the occupied space increases. The thickness of the second plate body 104 is H22, where H22:H10 = (0.01 ∼ 0.2):1. When H22 / H10 is less than 0.01, the thickness of the second plate body 104 is relatively thin, the structural strength is relatively weak, and it is prone to damage during use. When H21 / H10 is greater than 0.2, the thickness of the second plate body 104 is relatively thick, the thermal conductivity and heat transfer performance decrease, and the occupied space increases.

[0062] In some embodiments and with reference to Fig. 9 and Fig. 10, the thickness of the wire mesh 116 is H30, where H30:H10 = (0.01 ∼ 0.7): 1. When H30 / H10 is less than 0.01, the thickness of the wire mesh 116 is relatively thinner, and the thermal conductivity decreases; when H30 / H10 is greater than 0.7, the thickness of the wire mesh 116 increases, and more space is occupied in the internal cavity 102, which leads to a decrease in the amount of working fluid in the internal cavity 102 and affects the performance of the heat distribution plate 100.

[0063] In some embodiments and with respect to Fig. 9 and Fig. 10, the thickness of the liquid receiving core 114 is H40, where H40:H10 = (0.015 ∼ 0.8):1. It should be noted that when H40 / H10 is less than 0.015, the thickness of the liquid receiving core 114 is relatively thinner, and the thermal conductivity and heat transfer performance decrease; when H40 / H10 is greater than 0.8, the thickness of the liquid receiving core 114 is relatively thick and occupies more space in the internal cavity 102, resulting in a decrease in the amount of working fluid in the internal cavity 102 and affecting the performance of the heat distribution plate 100.

[0064] In some embodiments, the total thickness of the heat distribution plate 100 is 0.2 mm to 15 mm, and H10 may be 0.2 mm, 0.21 mm, 0.23 mm, 0.25 mm, 0.3 mm, 0.31 mm, 0.36 mm, 0.38 mm, 0.4 mm, 0.42 mm, 0.45 mm, 0.48 mm, 0.5 mm, 0.55 mm, 0.6 mm, 0.64 mm, 0.7 mm, 0.77 mm, 0.8 mm, 0.9 mm, 1 mm, 1.5 mm, 1.8 mm, 2 mm, 2.2 mm, 3 mm, 3.5 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, 11 mm, 12.5 mm, 13 mm, 14 mm, 14.5 mm, 15 mm or other data not listed.

[0065] The thickness of the plate body (the first plate body 103 or the second plate body 104) is 0.02 mm to 3 mm, and may be 0.02 mm, 0.03 mm, 0.04 mm, 0.05 mm, 0.06 mm, 0.1 mm, 0.2 mm, 0.5 mm, 0.6 mm, 0.8 mm, 1 mm, 1.2 mm, 1.5 mm, 1.6 mm, 1.8 mm, 2 mm, 2.2 mm, 2.4 mm, 2.5 mm, 2.8 mm, 3 mm or other data not listed.

[0066] The thickness of wire mesh 116 is 0.011mm to 0.3mm, and H30 can be 0.011mm, 0.012mm, 0.013mm, 0.015mm, 0.1mm, 0.11mm, 0.12mm, 0.15mm, 0.16mm, 0.18mm, 0.2mm or other data not listed.

[0067] The thickness of the liquid absorption core 114 is 0.08 mm to 0.5 mm, and H40 can be 0.08 mm, 0.09 mm, 0.1 mm, 0.11 mm, 0.15 mm, 0.16 mm, 0.18 mm, 0.2 mm, 0.22 mm, 0.25 mm, 0.28 mm, 0.3 mm, 0.32 mm, 0.33 mm, 0.34 mm, 0.35 mm, 0.38 mm, 0.4 mm, 0.41 mm, 0.42 mm, 0.45 mm, 0.48 mm, 0.49 mm, 0.5 mm or other data not listed.

[0068] It should be noted that as the thickness of H10 decreases, the thicknesses of H21, H22, H30, and H40 decrease accordingly. As the thickness of H10 increases, the thicknesses of H21, H22, H30, and H40 also increase.

[0069] The plate 101 comprises a first part 110, a second part 111 and a third part 112, wherein the second part 111 is connected between the first part 110 and the third part 112. See Fig. 13, in some embodiments, the first part 110 and the third part 112 are on the same plane, and the heat distribution plate 100 has a "1"-shaped structure. See Fig. 14, in other embodiments, the first part 110 and the third part 112 are located at different levels, and the heat distribution plate 100 has an "L"-shaped structure. In some embodiments and with reference to Fig. 15, two "L"-shaped heat distribution plates 100 are joined together to form a "T"-shaped heat distribution plate 100. It should be noted that the selection can be made according to the actual situation.

[0070] In some embodiments and with respect to Fig. 1, a liquid inlet 122 is further formed on the heat distribution plate 100. The liquid inlet 122 communicates with the internal cavity 102. The liquid inlet 122 is provided with the injection tube connected to the outside and configured to introduce working fluid into the internal cavity 102.

[0071] The present application further proposes a method for manufacturing a heat distribution plate 100, which comprises the following manufacturing steps:

[0072] Selecting the material, wherein the first plate body 103, the second plate body 104, the wire mesh 116, the liquid receiving core 114 and the injection pipe are all made of stainless steel.

[0073] Placing the first plate body 103 and the second plate body 104 on a punching machine, wherein a first groove is formed on the first plate body 103 and a second groove is formed on the second plate body 104 by punching.

[0074] Cleaning the first plate body 103, the second plate body 104, the mesh wire 116, the liquid receiving core 114 and the injection pipe with ultrasonic waves.

[0075] Successive welding of the reinforcing structure 105 on the first plate body 103.

[0076] Coating on the first plate body 103 and the second plate body 104 by means of the vacuum ion plating, so that a protective layer 107a can be coated on the outside of the first plate body 103 and the second plate body 104.

[0077] Placing the first plate body 103 on an operating table, mounting the fluid absorption core 114 on the first plate body 103, placing the mesh wire 116 on the fluid absorption core 114, and placing the second plate body 104 on the first plate body 103, and then edge sealing by laser welding and welding the first plate body 103 and the second plate body 104 together.

[0078] Welding the injection tube to the liquid inlet 122, injecting the pure water into the inner cavity 102 through the injection tube, then evacuating the inner cavity 102 (with a vacuum of 0.08 torr), and followed by welding sealing by laser welding to obtain the heat distribution plate 100.

[0079] An aging test on the heat distribution plate 100 (test conditions: 85±5°C, 12 ∼ 24h) is conducted to check whether its performance deteriorates.

[0080] A gas seal test on the heat distribution plate 100 (test conditions: helium pressure of 0.16 - 0.6 MPa, 4h) is conducted to check whether its performance deteriorates.

[0081] It should be noted that the test methods and performance verifications for the aging test and gas seal test may refer to the conventional settings in this area and are not repeated here.

[0082] In some embodiments, the reinforcement structure 105 includes a plurality of support columns spaced apart on the first plate body 103. The distance between adjacent two support columns is 5 mm to 15 mm, and the diameter of each support column is 1 mm to 5 mm. The wire mesh 116 has 200 to 250 meshes.

[0083] It should be noted that in related technologies, the upper shell plate and the lower shell plate are connected by welding. During the welding process, it is prone to solder overflow, and the liquid receiving core 114 and the other structures within the heat distribution plate 100 are contaminated; moreover, the solder overflow may cause an increase in the local thickness of the heat distribution plate 100 and a reduction in the heat conduction effect. To avoid this problem, with reference to Fig. 1, Fig. 16 and Fig. 18, the heat distribution plate comprises a plate 101 comprising a first plate body 103 and a second plate body 104 arranged opposite the first plate body 103. The first plate body 103 and the second plate body 104 enclose an internal cavity 102, a first groove 21 is provided on the first plate body 103 and / or the second plate body 104, and the first groove 21 surrounds the internal cavity 102. A solder for welding the first plate body 103 and the second plate body 104 is formed in the first groove 21. The first groove 21 is provided on the first plate body 103 and / or the second plate body 104, and the solder is formed in the first groove 21. When welding the first plate body 103 and the second plate body 104, the solder melts and the first groove 21 is filled with the solder, which can prevent the solder from overflowing into the inner cavity 102 and contaminating other structures in the inner cavity 102.At the same time, setting the solder in the first groove 21 can not only improve the joining strength between the first plate body 103 and the second plate body 104, but also prevent the solder in the first groove 21 from overflowing during the welding process, thereby ensuring that the thickness of the heat distribution plate 100 is basically uniform, and avoiding the solder overflow, which causes the local increase in thickness of the heat distribution plate 100 and impairs the heat conduction effect of the heat distribution plate 100.

[0084] It should be noted that the specific position of the first groove 21 is not limited and can be selected according to the actual situation. In some embodiments, the first groove 21 is formed on the first plate body 103. In other embodiments, the first groove 21 is formed on the second plate body 104. In other embodiments, the first groove 21 is formed simultaneously on both the first plate body 103 and the second plate body 104.

[0085] In some embodiments and with respect to Fig. 1, the first plate body 103 is the lower shell plate, and the second plate body 104 is the upper shell plate. The upper shell plate and the lower shell plate are each provided with a first receiving slot 111b and a second receiving slot 121b. The upper shell plate and the lower shell plate are welded together so that the first receiving slot 111b and the second receiving slot 121b can communicate and form the internal cavity 102. It should be noted that the first reinforcement structure 105 is also provided on the heat distribution plate 100, and the specific position of the first reinforcement structure 105 is not limited as long as it can be located in the internal cavity 102. In the above embodiments, the first reinforcement structure 105 is provided on the first plate body 103.Of course, the first reinforcement structure 105 can also be provided on the second plate body 104, and the selection thereof can be made according to the actual situation. Since the first plate body 103 is the lower shell plate, providing the first reinforcement structure 105 on the first plate body 103 is more convenient for the welded connection between the first plate body 103 and the second plate body 104.

[0086] In some embodiments, a working fluid is formed in the internal cavity 102 for heat exchange. Note that the type of working fluid is not limited and can be selected according to the actual application. For example, the working fluid can be lubricating oil, water, cold air, alcohol compounds, and so on.

[0087] Related to Fig. 16, Fig. 17 and Fig. 4, the first receiving slot 111b is formed on the first plate body 103. The edge of the first receiving slot 111b is folded outward to form a first connecting wall 112b. The second receiving slot 121b is formed on the second plate body 104. The edge of the second receiving slot 121b is folded outward to form a second connecting wall 122b. The first connecting wall 112b corresponds to the second connecting wall 122b. In the actual welding process, the first plate body 103 and the second plate body 104 are welded together by welding the first connecting wall 112b and the second connecting wall 122b. The first groove 21 is formed on a side of the first connecting wall 112b facing the second plate body 104, and the second plate body 104 covers the first groove 21.In this embodiment, the first groove 21 is used to receive the solder, and the second connecting wall 122b serves as a "cover plate" that covers the first groove 21 and forms a receiving cavity 23 between them. During welding, the solder melts and the receiving cavity 23 is filled with the solder. Because the second connecting wall 122b covers the first groove 21, the overflow of solder from the first groove 21 can be blocked, preventing the solder from overflowing into the internal cavity 102 and contaminating the internal cavity 102.

[0088] Related to Fig. 20, Fig. 21 and Fig. 22, the first groove 21 has a first side edge 211 facing the inner cavity 102 and a second side edge 212 facing away from the inner cavity 102. The vertical distance from the first side edge 211 to the second side edge 212 is D1, and the width of the first connecting wall 112b is D4, where 0.05 ≤ D1 / D4 ≤ 0.25. It should be noted that the width of the first groove 21 should not be too wide or too small. If D1 / D4 is less than 0.05, the width of the first groove 21 is too narrow, and the volume of the first groove 21 decreases. If the volume of the solder remains unchanged and because the first groove 21 is too small, the solder will still overflow from the first groove 21 during welding and flow into the inner cavity 102 and contaminate the inner cavity 102.If the solder is reduced accordingly, this will cause a reduction in the joint strength between the first plate body 103 and the second plate body 104, which are prone to cracking during use. If D1 / D4 is greater than 0.25, the width of the first groove 21 is too large, resulting in a reduction in the strength of the first joint wall 112b, which is prone to fracture during the welding process.

[0089] It should be noted that the specific position of the first groove 21 is not limited and can be adjusted according to the actual situation. In this embodiment, the vertical distance from the first side edge 211 to the edge of the inner cavity 102 is D2, and the vertical distance from the second side edge 212 to a side of the first connecting wall 112b facing away from the inner cavity 102 is D3, where, 0.9 ≤ D2 / D3 ≤ 1.1. If D2 / D3 is less than 0.9, the first groove 21 is too close to the inner cavity 102, and during the welding process, the solder is still prone to intruding into and contaminating the inner cavity 102. When D2 / D3 is greater than 1.1, the first groove 21 is too far from the inner cavity 102, which can effectively avoid the penetration and contamination of the solder.However, if the first groove 21 is too close to the edge of the first connecting wall 112b, the edge of the first connecting wall 112b is prone to cracking due to heat during the welding process. The first groove 21 is located in the middle position of the first connecting wall 112b, i.e., D2 = D3. This setting can also ensure the uniformity of the force on the first connecting wall 112b during the welding process.

[0090] In some embodiments and with respect to Fig. 18 and Fig. 19, the edge of the second plate body 104 is formed with a second connecting wall 122b corresponding to the first connecting wall 112b. The second connecting wall 122b is provided with a protrusion 22 on a side facing the first connecting wall 112b, and the protrusion 22 covers the first groove 21. In the actual assembly process, the solder is first placed in the first groove 21, and then the second plate body 104 covers the first plate body 103 so that the protrusion 22 corresponds to the first groove 21. During the covering process, the protrusion 22 can be clamped in the first groove 21.On the one hand, the protrusion 22 cooperates with the first groove 21, which can enable pre-fixing of the first plate body 103 and the second plate body 104 and facilitate the welding operation for the operator; On the other hand, the protrusion 22 cooperates with the first groove 21, which can enable fixing of the solder in the first groove 21 and prevent penetration of solder, thereby protecting the inner cavity 102 and avoiding contamination of the inner cavity 102.

[0091] Please refer to Fig. 20 and Fig. 21. Along the thickness direction of the first plate body 103, the height of the protrusion 22 is E1 and the depth of the first groove 21 is E2. E1 is smaller than E2. In this embodiment, the height of the protrusion 22 is smaller than the depth of the first groove 21. The purpose of this setting is to prevent the solder from being squeezed out when the protrusion 22 cooperates with the first groove 21, which may cause the solder to penetrate and contaminate the internal cavity 102. At the same time, because the height of the protrusion 22 is smaller than the depth of the first groove 21, the receiving cavity 23 is formed between the first groove 21 and the protrusion 22, and the solder is formed in the receiving cavity 23. The receiving cavity 23 is used to receive the solder, thereby preventing solder overflow and contamination of the internal cavity 102.

[0092] In some embodiments, E2 = E1 + F1, where F1 is a first coefficient, with 0.05 mm ≤ F1 ≤ 0.15 mm. It should be noted that F1 is the depth of the receiving cavity 23. If F1 is less than 0.05, the height of the protrusion 22 is too high, resulting in the depth of the receiving cavity 23 being too shallow. If the volume of the solder remains unchanged, the solder will still overflow from the first groove 21 during welding and flow into the inner cavity 102, contaminating the inner cavity 102. If the solder is reduced accordingly, this will cause a reduction in the joint strength between the first plate body 103 and the second plate body 104, which are prone to cracking during use.If F1 is greater than 0.15, the height of the protrusion 22 is too small, resulting in an increase in the volume of the receiving cavity 23 and a reduction in the sealing effect of the receiving cavity 23, as well as a tendency for solder overflow. In this embodiment, F1 can be 0.05 mm, 0.06 mm, 0.07 mm, 0.08 mm, 0.09 mm, 0.1 mm, 0.11 mm, 0.12 mm, 0.13 mm, 0.14 mm, 0.15 mm, or other data not listed.

[0093] See Fig. 20, Fig. 21 and Fig. 22. The thickness of the first joint wall 112b is E3, where 0.06 ≤ E2 / E3 ≤ 0.7. It should be noted that if E2 / E3 is less than 0.06, the depth of the first groove 21 is too small and the volume of the first groove 21 is reduced. If the volume of the solder remains unchanged, the solder will still overflow from the first groove 21 during welding and flow into the inner cavity 102, contaminating the inner cavity 102. If the solder is reduced accordingly, this will cause a reduction in the joint strength between the first plate body 103 and the second plate body 104, which are prone to cracking during use. When E2 / E3 is greater than 0.7, the depth of the first groove 21 increases, and the first connecting wall 112b has reduced structural strength and is susceptible to damage.

[0094] In some embodiments, the thickness of the second connecting wall 122b is E4, where 0.05 ≤ E1 / E4 ≤ 0.6. If E1 / E4 is less than 0.05, the height of the protrusion 22 is too small, resulting in an increase in the volume of the receiving cavity 23 and a reduction in the sealing effect of the receiving cavity 23, as well as a tendency for solder overflow. If E1 / E4 is greater than 0.6, the height of the protrusion 22 is too high, resulting in the depth of the receiving cavity 23 being too shallow. If the volume of the solder remains unchanged, the solder will still overflow from the first groove 21 during welding and flow into the inner cavity 102, contaminating the inner cavity 102; If the solder is reduced accordingly, a reduction in the joining strength between the first plate body 103 and the second plate body 104 is caused, which are prone to splitting during use.

[0095] In some embodiments, the volume of the receiving cavity 23 is V1, and the volume of the solder is V2, with 0.65 ≤ V2 / V1 ≤ 1. It should be noted that if V2 / V1 is less than 0.65, the volume of the solder is too small, and the welding strength of the first plate body 103 and the second plate body 104 is reduced, which can easily lead to defects such as virtual welding; if V2 / V1 is greater than 1, the volume of the solder is too large, and it is prone to the occurrence of solder penetration during the welding process, and thus the flow of solder into the inner cavity 102 and the contaminating the inner cavity 102.

[0096] See Fig. 20 and Fig. 21. The width of the first groove 21 is F1, and the width of the projection 22 is F2, where F1 = F2 + F2, where F2 is a second coefficient, with 0.03 mm ≤ F2 ≤ 0.05 mm. Note that the purpose of such adjustment is to facilitate the covering of the first plate body 103 and the second plate body 104, and the projection 22 is in a clearance fit with the first groove 21, which facilitates operation for the operator. F2 can be 0.03 mm, 0.04 mm, 0.05 mm, or other unlisted data.

[0097] In some embodiments, the heat distribution plate 100 further includes a plurality of liquid absorption cores 114 and a mesh 116. The plurality of liquid absorption cores 114 are located within the inner cavity 102 and are arranged on the first plate body 103 and extend along the length direction of the plate 101. The plurality of liquid absorption cores 114 are arranged at intervals in the inner cavity 102 along the width direction of the plate 101, and the mesh 116 is arranged between the liquid absorption cores 114 and the second plate body 104.

[0098] It should be noted that the specific materials of the liquid absorption core 114 and the mesh 116 are not limited and can be selected according to the actual situation. In this embodiment, the liquid absorption core 114 is a stainless steel liquid absorption core 114, and the mesh 116 is a stainless steel mesh 116. Stainless steel material has strong corrosion resistance and strong structural strength and cannot be damaged. In other embodiments, the liquid absorption core 114 is a copper liquid absorption core, and the mesh 116 is a copper mesh 116.

[0099] In some embodiments, please refer to Fig. 1. A fluid inlet 122 is further formed on the heat distribution plate 100 and communicates with the internal cavity 102. The fluid inlet 122 is provided with an injection tube connected to the outside and used to introduce working fluid into the internal cavity 102.

[0100] The plate 101 comprises a first part 110, a second part 111 and a third part 112, wherein the second part 111 is connected between the first part 110 and the third part 112. See Fig. 9, in some embodiments, the first part 110 and the third part 112 are on the same plane, and the heat distribution plate 100 has a "1"-shaped structure. See Fig. 10, in other embodiments, the first part 110 and the third part 112 are located at different levels, and the heat distribution plate 100 has an "L"-shaped structure. See Fig.11, two "L"-shaped heat distribution plates 100 are joined together to form a "T"-shaped heat distribution plate 100.

[0101] The present application also proposes a battery including the heat distribution plate 100. The specific structure of the heat distribution plate 100 will not be repeated. Since this battery adopts all the technical solutions of the embodiments of the heat distribution plate 100, it has at least all the advantageous effects brought about by the technical solutions of the above embodiments, which are not repeated here.

[0102] In one embodiment, the battery further includes a battery case composed of the heat distribution plate 100. That is, six sides of the battery case can be composed of the heat distribution plate 100. In this way, space can be saved and the space utilization rate can be increased. Note that the six heat distribution plates 100 can be in communication or not in communication, which can be selected according to the actual situation.

[0103] In some embodiments, the battery case has six housing surfaces, and the heat distribution plate 100 can be applied to each housing surface of the battery case or can be applied to multiple housing surfaces simultaneously. For example, the heat distribution plate 100 can be applied to two adjacent housing surfaces of the battery case. A first part 110 of the heat distribution plate 100 corresponds to one housing surface, and a second part 111 of the heat distribution plate 100 corresponds to the other housing surface, so that the heat distribution plate 100 can serve as two housing surfaces of the battery case. Specifically, the selection can be made according to the size of the battery module.

[0104] In some other embodiments, the heat distribution plate 100 may further be applied within the battery, which includes the battery casing and a cell pack group. The cell pack group is mounted in the battery casing and includes at least one cell pack. The first part 110 of the heat distribution plate 100 corresponds to one side of the cell pack, and the second part 111 of the heat distribution plate 100 corresponds to the other side of the cell pack. To further equalize the temperature of adjacent cell packs, a heat distribution plate 100 may be arranged between adjacent two cell packs to achieve temperature equalization of the multiple sides, thereby transferring the temperature from the high-temperature part to the low-temperature part directly cooled by the cooling plate, increasing the cooling efficiency and preventing thermal runaway.

[0105] In some other embodiments, the heat distribution plate 100 may further be applied to the battery module. The battery module includes multiple batteries. The first part 110 of the heat distribution plate 100 corresponds to one side of the battery case, and the second part 111 of the heat distribution plate 100 corresponds to the other side of the battery case. To further equalize the temperature of adjacent batteries, a heat distribution plate 100 may be arranged between adjacent two batteries to achieve temperature equalization of the multiple sides, thereby transferring the temperature from the high-temperature part to the low-temperature part, which is directly cooled by the cooling plate.

[0106] The technical solution of the present application is explained in more detail below using specific embodiments and data. It should be understood that the following embodiments are used only to illustrate the present application and do not limit it.

[0107] It should be noted that the welding methods in the first to third embodiments and in the first and second comparative examples are soldering, and the solder used is solder paste. First embodiment

[0108] The first groove is formed on the first plate body, and the protrusion is formed on the second plate body. The height of the protrusion is 0.1 mm, and the depth of the first groove is 0.15 mm. Examination:

[0109] Conduct an airtightness test of the heat distribution plate, and the airtightness of the heat distribution plate is qualified;

[0110] Cut the heat distribution plate and observe the internal structure of the heat distribution plate after cutting. It is found that there is no solder on the fluid absorption core and mesh wire. Second embodiment

[0111] The first groove is formed on the first plate body, and the protrusion is formed on the second plate body. The height of the protrusion is 0.1 mm, and the depth of the first groove is 0.2 mm. Examination:

[0112] Conduct an airtightness test of the heat distribution plate, and the airtightness of the heat distribution plate is qualified;

[0113] Cut the heat distribution plate and observe the internal structure of the heat distribution plate after cutting. It is found that there is no solder on the fluid absorption core and mesh wire. Third embodiment

[0114] The first groove is formed on the first plate body, and the protrusion is formed on the second plate body. The height of the protrusion is 0.1 mm, and the depth of the first groove is 0.25 mm. Examination:

[0115] Conduct an airtightness test of the heat distribution plate, and the airtightness of the heat distribution plate is qualified;

[0116] Cut the heat distribution plate and observe the internal structure of the heat distribution plate after cutting. It is found that there is no solder on the fluid absorption core and mesh wire. First comparison example

[0117] The first groove is formed on the first plate body, and the protrusion is formed on the second plate body. The height of the protrusion is 0.15 mm, and the depth of the first groove is 0.1 mm. Examination:

[0118] Conduct air tightness test of heat distribution plate, and it shows NG in air tightness;

[0119] Cut off the heat distribution plate and observe the internal structure of the heat distribution plate after cutting. It is found that there is solder on the fluid absorption core, and the fluid absorption core is contaminated. Second comparison example

[0120] The first groove is formed on the first plate body, and the protrusion is formed on the second plate body. The height of the protrusion is 0.05 mm, and the depth of the first groove is 0.2 mm. Examination:

[0121] Conduct air tightness test of heat distribution plate, and it shows NG in air tightness;

[0122] Cut the heat distribution plate and observe the internal structure of the heat distribution plate after cutting. It is found that there is no solder on the fluid absorption core and mesh wire.

Claims

[1] Heat distribution plate (100) comprising: a plate (101) in which an internal cavity (102) is formed, wherein the plate (101) comprises a first plate body (103) and a second plate body (104) arranged opposite the first plate body (103), wherein the first plate body (103) and the second plate body (104) enclose at least a part of the internal cavity (102); and a reinforcing structure (105) provided on the first plate body (103) and located within the inner cavity (102); wherein a compressive strength of the heat distribution plate (100) is greater than or equal to 2.5 MPa. [2] The heat distribution plate (100) of claim 1, wherein the reinforcing structure (105) comprises a plurality of reinforcing rib assemblies (106), each reinforcing rib assembly (106) comprising a plurality of reinforcing rib rows (107), each reinforcing rib row (107) comprising a plurality of first reinforcing ribs (108) arranged in an array. [3] The heat distribution plate (100) according to claim 2, wherein each reinforcing rib row (107) further comprises second reinforcing ribs (109), the plurality of second reinforcing ribs (109) being arranged in an array, a length of at least one second reinforcing rib (109) being smaller than a length of at least one first reinforcing rib (108); the first plate body (103) further comprises a first part (110), a second part (111), and a third part (112), the second part (111) being connected between the first part (110) and the third part (112), the plurality of first reinforcing ribs (108) being provided in the first part (110), the plurality of second reinforcing ribs (109) being provided in the third part (112), the second part (111) comprising a flat plate or a bending plate. [4] The heat distribution plate (100) according to claim 3, wherein the reinforcing structure (105) further comprises a third reinforcing rib (113) extending along a width direction of the plate (101) and provided in the second part (111). [5] The heat distribution plate (100) according to any one of claims 2 to 4, wherein the heat distribution plate (100) further comprises a plurality of liquid absorption cores (114), wherein a liquid absorption core mounting channel (115) is formed between adjacent two reinforcing rib assemblies (106), wherein the liquid absorption cores (114) are mounted in the liquid absorption core mounting channel (115). [6] The heat distribution plate (100) of claim 5, wherein the liquid receiving core (114) comprises one of a stainless steel liquid receiving core and a copper liquid receiving core. [7] The heat distribution plate (100) according to any one of claims 2 to 6, wherein the reinforcing structure (105) further comprises a support structure, the support structure comprising a plurality of first support rows (117), each first support row (117) comprising a plurality of first support columns (118), the plurality of first support columns (118) being evenly arranged along a length direction of the plate (101); wherein, in the same reinforcing rib assembly (106), a support mounting channel (119) is provided between adjacent two reinforcing rib rows (107), and the plurality of first support rows (117) are mounted in the support mounting channel (119). [8] Heat distribution plate (100) according to claim 7, wherein adjacent two first rows of supports (117) are offset from one another in the same support mounting channel (119). [9] The heat distribution plate (100) of any one of claims 2 to 8, wherein the reinforcing structure (105) further comprises a plurality of second support rows (120) and a plurality of support gaps (121), the plurality of second support rows (120) and the plurality of support gaps (121) surrounding the plurality of reinforcing rib assemblies (106). [10] The heat distribution plate (100) of claim 9, wherein each second support row (120) comprises a plurality of second support columns (123), wherein a distribution density of the plurality of first support columns (118) is lower than a distribution density of the plurality of second support columns (123). [11] The heat distribution plate (100) according to any one of claims 2 to 10, wherein the reinforcing structure (105) further comprises a support structure (124), the support structure (124) comprising a plurality of first support columns (118); wherein, in the same reinforcing rib assembly (106), a support mounting channel (119) is provided between the adjacent two reinforcing rib rows (107), the plurality of first support columns (118) being mounted in the support mounting channel (119), and the plurality of first support columns (118) being irregularly arranged. [12] Heat distribution plate (100) according to one of claims 2 to 11, wherein a sum of the areas of the positive projections of the reinforcing structure (105) onto the first plate body (103) is S1, and a cross-sectional area of ​​the inner cavity (102) is S2, with (1:124) ≤ (S1 / S2) ≤ (0.5:1). [13] Heat distribution plate (100) according to one of claims 2 to 12, wherein a length of the heat distribution plate (100) is L1 and a length of each first reinforcing rib (108) is L2, with L2 / L1 = (0.1 ∼ 0.7):1; and / or a width of the plate (101) is H1 and a width of each first reinforcing rib (108) is H2, with H2 / H1 = (0.01 ∼ 0.5):

1. [14] The heat distribution plate (100) according to claim 12 or 13, wherein a length of the heat distribution plate (100) is L1 and a length of each second reinforcing rib (109) is L3, with L3 / L1 = (0.1 ∼ 0.2):1; and / or a width of the plate (101) is H1 and a width of each second reinforcing rib (109) is H3, with H3 / H1 = (0.01 ∼ 0.5):

1. [15] Heat distribution plate (100) according to one of claims 1 to 14, wherein an outer side of the first plate body (103) facing away from the inner cavity (102) is inwardly directed, and an inner side of the first plate body (103) facing the inner cavity (102) protrudes to form the reinforcing structure (105). [16] The heat distribution plate (100) according to any one of claims 1 to 15, wherein the heat distribution plate (100) comprises a stainless steel heat distribution plate, and the reinforcing structure (105) is integrally formed by stamping. [17] Heat distribution plate (100) according to one of claims 1 to 16, wherein the heat distribution plate (100) comprises a stainless steel heat distribution plate, and at least a part of the reinforcing structure (105) is welded to the second plate body (104). [18] The heat distribution plate (100) according to any one of claims 1 to 17, wherein the first plate body (103) and the second plate body (104) are arranged opposite to each other along a first direction, wherein at least one of the first plate body (103) and the second plate body (104) comprises a core material layer (106a) and a protective layer (107a) located on at least one side of the core material layer (106a) in the first direction, wherein a thickness of the core material layer (106a) is B1 and a thickness of the protective layer (107a) is A1, with A1:B1 = (0.0005 ∼ 0.2):

1. [19] The heat distribution plate (100) according to claim 18, wherein the core material layer (106a) comprises a stainless steel layer or a copper layer, and the protective layer (107a) comprises any one of a nickel layer, a chromium layer, a zinc layer, an organic coating, and a Teflon coating. [20] The heat distribution plate (100) according to claim 18 or 19, wherein the protective layer (107a) formed by vacuum ion plating is formed on both opposite sides of the core material layer (106a). [21] Heat distribution plate (100) according to one of claims 1 to 20, wherein the first plate body (103) and the second plate body (104) both comprise: a base plate (108a); a side plate (109a) surrounding the base plate (108a); and a mounting plate (110a) which is bently connected to an end of the side plate (109a) facing away from the base plate (108a) and extends in the direction away from the base plate (108a); wherein the mounting plate of the first plate body (103) is connected to the mounting plate (110a) of the second plate body (104) by a welded connection part. [22] The heat distribution plate (100) according to claim 21, wherein the welded joint part is formed by welding two mounting plates (110a) at their welding edge; wherein a shortest distance between the welding edge and an end of the mounting plate (110a) facing away from the side plate (109a) is C1, with 5 mm ≤ C1 ≤ 15 mm. [23] Heat distribution plate (100) according to claim 21 or 22, wherein the bottom plate (108a) and the side plate (109a) enclose a groove; wherein the groove of the first plate body (103) is in communication with the groove of the second plate body (104) to form the internal cavity (102), wherein a working fluid is formed within the internal cavity (102). [24] The heat distribution plate (100) according to claim 23, wherein the first plate body (103) has the groove which is punch-formed; and / or the second plate body (104) has the groove which is punch-formed. [25] The heat distribution plate (100) according to claim 5 or 6, wherein a plurality of liquid absorption cores (114) are provided on a side of the first plate body facing the second plate body; wherein the heat distribution plate (100) further comprises a wire mesh (116) provided on a side of the plurality of liquid absorption cores (114) facing away from the first plate body. [26] The heat distribution plate (100) of claim 25, wherein the wire mesh (116) comprises any one of stainless steel wire mesh and copper wire mesh. [27] Heat distribution plate (100) according to claim 25 or 26, wherein a total thickness of the heat distribution plate (100) is H10 and a thickness of the first plate body (103) is H21, with H21:H10 = (0.01 ∼ 0.2):1; and / or wherein a total thickness of the heat distribution plate (100) is H10, and a thickness of the second plate body (104) is H22, with H22:H10 = (0.01 ∼ 0.2):1; and / or wherein a total thickness of the heat distribution plate (100) is H10, and a thickness of the wire mesh (116) is H30, with H30:H10 = (0.01 ∼ 0.7):1; and / or wherein a total thickness of the heat distribution plate (100) is H10, and a thickness of the liquid absorption core (114) is H40, with H40:H10 = (0.015 ∼ 0.8):

1. [28] Heat distribution plate (100) according to one of claims 1 to 27, wherein a first groove (21) is provided on the first plate body (103) and / or the second plate body (104), the first groove (21) surrounding the inner cavity (102) and a solder is formed within the first groove (21) for welding the first plate body (103) and the second plate body (104). [29] Heat distribution plate (100) according to claim 28, wherein a first connecting wall (112b) is formed on an edge of the first plate body (103) and the first connecting wall (112b) abuts the inner cavity (102), wherein the first groove (21) is formed on a side of the first connecting wall (112b) facing the second plate body (104), wherein the second plate body (104) covers the first groove (21). [30] Heat distribution plate (100) according to claim 29, wherein the first groove (21) has a first side edge (211) facing the inner cavity (102) and a second side edge (212) facing away from the inner cavity (102), wherein a vertical distance from the first side edge (211) to the second side edge (212) is D1, and a width of the first connecting wall (112b) is D4, with 0.05 ≤ D1 / D4 ≤ 0.

25. [31] Heat distribution plate (100) according to claim 30, wherein a vertical distance from the first side edge (211) to the edge of the inner cavity (102) is D2, and a vertical distance from the second side edge (212) to the side of the first connecting wall (112b) facing away from the inner cavity (102) is D3, with 0.9 ≤ D2 / D3 ≤ 1.

1. [32] Heat distribution plate (100) according to one of claims 29 to 31, wherein a second connecting wall (122b) is formed on an edge of the second plate body (104) and the second connecting wall (122b) abuts against the inner cavity (102), the second connecting wall (122b) corresponding to the first connecting wall (112b), a projection (22) being provided on a side of the second connecting wall (122b) facing the first connecting wall (112b), the projection (22) being embedded in the first groove (21). [33] The heat distribution plate (100) according to claim 32, wherein along a thickness direction of the first plate body (103), a height of the projection (22) is E1, a depth of the first groove (21) is E2, where E1 is smaller than E2, so that a receiving cavity (23) is formed between the first groove (21) and the projection (22), and the solder is formed in the receiving cavity (23). [34] Heat distribution plate (100) according to claim 33, wherein, E2 = E1 + b1, where b1 is a first coefficient, with 0.05 mm ≤ b1 ≤ 0.15 mm. [35] The heat distribution plate (100) according to claim 33 or 34, wherein a thickness of the first connecting wall (112b) is E3, with 0.06 ≤ E2 / E3 ≤ 0.7; and / or wherein a thickness of the second connecting wall (122b) is E4, with 0.05 ≤ E1 / E4 ≤ 0.

6. [36] Heat distribution plate (100) according to one of claims 33 to 35, wherein a volume of the receiving cavity (23) is V1, a volume of the solder is V2, with 0.65 ≤ V2 / V1 ≤ 1. [37] Heat distribution plate (100) according to one of claims 32 to 36, wherein a width of the first groove (21) is F1, a width of the projection (22) is F2, with F1 = F2 + b2, where b2 is a second coefficient, with 0.03 mm ≤ b2 ≤ 0.05 mm. [38] The heat distribution plate (100) according to any one of claims 1 to 37, wherein a cross-sectional shape of the heat distribution plate (100) includes at least one of "I" shape, "L" shape and "T" shape. [39] A battery comprising the heat distribution plate (100) according to any one of claims 1 to 38. [40] A battery module comprising a heat distribution plate (100) according to any one of claims 1 to 38 or a battery according to claim 39.

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