Box body, battery pack and electric device

Abstract

The invention provides a box body, a battery pack and an electric device, and relates to the technical field of batteries. The box body comprises a frame body, a heat exchange plate, a fixed beam and a supporting block. And the heat exchange plate is fixed on the frame body. A containing cavity is formed by the heat exchange plate and the frame body. The fixed beam is connected with the heat exchange plate; the fixing beams are used for dividing the containing cavity into a plurality of containing areas, and each containing area is used for containing a battery. The supporting block is arranged between the heat exchange plate and the fixed beam so that an air gap can be formed between the fixed beam and the heat exchange plate. Due to the fact that the air gaps are formed between the heat exchange plates and the fixing beams, heat exchange between the heat exchange plates and the fixing beams can be reduced, the heat exchange efficiency between the batteries and the heat exchange plates is higher, and the temperature uniformity of the batteries in the whole battery pack is improved.

Description

Technical Field

[0001] The present invention relates to the field of battery technology, and in particular to a box, a battery pack and an electrical device. Background Art

[0002] The CTP solution is a solution commonly used in the battery industry to assemble battery cells into battery packs. CTP is the abbreviation of Cell to Pack, which means that the battery cells are directly integrated into battery packs, thus eliminating the intermediate module link. The structural beams of the box body form a closed frame space, and the batteries are assembled inside after being compressed. CTP improves the internal space utilization and volume energy density of the battery. However, the CTP solution also has some defects. For example, the conventional liquid cooling plate solution is used in the CTP solution. When heating or dissipating the battery, the bottom water cooling plate will exchange heat with the structural beam, resulting in a large temperature deviation between the battery cell in contact with the structural beam and the middle battery cell, affecting the consistency of the overall battery cell temperature.

[0003] In the existing technical solutions, in order to solve the heat transfer problem between the bottom heat exchange plate and the beam of the box, the main method is to paste heat insulation foam material or heat insulation glue on the bottom of the beam to reduce the heat exchange between the heat exchange plate and the bottom of the beam. However, there are still some problems. For example:

[0004] First, the thermal insulation performance of foam is limited. The thermal conductivity of foam is generally between 0.2 and 1.0 W / MK. When the temperature of the heat exchange plate is significantly different from that of the beam, such as under -30°C low-temperature heating conditions, the temperature of the heat exchange plate can reach 40°C, while the temperature of the beam is close to the ambient temperature, about -30°C. In this case, heat will still be transferred from the heat exchange plate to the beam through heat conduction, causing the temperature of the battery cell in contact with the beam to be higher, resulting in an increase in the overall temperature difference of the battery cell and poor temperature uniformity.

[0005] Second, if thermal insulation glue is used, the thermal insulation glue is actually structural glue. The thermal conductivity of structural glue is generally 0.2-0.5W / mk, and the current glue filling scheme is also to apply glue over a large area. The problems are similar to those of foam pasting. Especially under low-temperature heating conditions, the heat transfer problem between the heat exchange plate and the beam is still very serious.

[0006] Alternatively, in the existing solution, heat insulation cotton is directly pasted between the heat exchange plate and the beam. Since the contact area between the beam and the heat exchange plate surface is large, the area of ​​the heat insulation cotton is also large, and the thickness of the heat insulation cotton is limited, generally 0.2-0.5 mm. A large pasting area means a large heat exchange area. When the temperature difference between the heat exchange plate and the beam is large, the larger heat exchange area will inevitably lead to an increase in the total heat exchange amount. In this case, the heat transfer between the beam and the heat exchange plate still has a large impact on the temperature difference of the battery cell.

[0007] In addition, the heat exchange plate and the beam are usually fastened with bolts, and insulation foam, insulation glue or insulation cotton is pasted between the heat exchange plate and the beam. Since these insulation materials are relatively soft, the foam will be compressed and deformed under the action of the bolt preload, and the deformation can generally reach more than 50%. At this time, the heat exchange plate will deform upward, causing the heat exchange plate in the bolt fixing area to arch upward, resulting in a decrease in the overall flatness of the heat exchange plate, thereby increasing the assembly tolerance of the heat exchange plate and the battery cell. Therefore, most of the existing technical solutions also adopt the solution of directly fitting the heat exchange plate to the beam and then fixing it with bolts, mainly to avoid the problem of flatness reduction caused by deformation of the cold plate after bolt fixing. However, the solution of directly fitting the heat exchange plate to the beam and then fixing it with bolts will inevitably have the problem of heat transfer between the heat exchange plate and the beam causing the temperature difference of the battery cell to expand. Summary of the invention

[0008] The objects of the present invention include, for example, providing a box, a battery pack and an electrical device, which can reduce the heat transfer between the heat exchange plate and the fixed beam, improve the heat exchange efficiency between the heat exchange plate and the battery, and improve the consistency of the overall battery temperature.

[0009] The embodiments of the present invention can be implemented as follows:

[0010] In a first aspect, the present invention provides a box, comprising:

[0011] Frame;

[0012] A heat exchange plate, wherein the heat exchange plate is fixed on the frame; the heat exchange plate and the frame form a receiving cavity;

[0013] A fixed beam connected to the heat exchange plate; the fixed beam is used to divide the accommodating cavity into a plurality of accommodating areas, each accommodating area is used to accommodate a battery;

[0014] A support block is disposed between the heat exchange plate and the fixed beam so that an air gap exists between the fixed beam and the heat exchange plate.

[0015] In an optional embodiment, the projection area of ​​the fixed beam on the heat exchange plate is S1, the projection area of ​​the support block on the heat exchange plate is S2, and S1 and S2 satisfy the following relationship:

[0016]

[0017] In an optional embodiment, a first groove is provided on a side of the heat exchange plate facing the fixed beam, the support block is provided in the first groove, and the height of the support block is greater than the depth of the first groove.

[0018] In an optional embodiment, a first annular protrusion and a second annular protrusion are provided on a side of the heat exchange plate facing the fixed beam; the first groove is formed between the first annular protrusion and the second annular protrusion;

[0019] The support block is made of elastic material, and the distance between the first annular protrusion and the second annular protrusion is greater than the width of the support block before deformation.

[0020] In an optional embodiment, a connecting piece is further included, and the connecting piece is sequentially passed through the heat exchange plate and the fixed beam, and the connecting piece is located on a side of the second annular protrusion away from the support block.

[0021] In an optional embodiment, when the connecting member is in a state of connecting the heat exchange plate and the fixed beam, the heat exchange plate and the fixed beam apply an extrusion force F to the support block; the support block is deformed under the extrusion force F, and the distance between the first annular protrusion and the second annular protrusion is equal to the width of the support block after deformation.

[0022] In an optional embodiment, the connecting member is a bolt, the bolt diameter is d, and the bolt torque is M; the height of the support block before deformation is H0, and the height after deformation is H1; each parameter satisfies the following relationship:

[0023] F = M / (k * d);

[0024] △H=F / (λ*EX)=H0-H1;

[0025] Among them, k is the preload coefficient of the bolt; △H is the deformation of the support block in the height direction; λ is the aging resilience energy attenuation coefficient of the support block, which is 0.85~0.95; EX is the elastic modulus of the support block, and * represents the multiplication sign.

[0026] In an optional embodiment, after the support block is deformed, the height of the air gap between the heat exchange plate and the fixed beam is G, and based on the unchanged volume of the support block before and after deformation, the following relationship is satisfied:

[0027] {(R1-R2)*(H0-△H)+[(D1-R1) 2 +(D2-R2) 2 ]*π}*(D1+D2)=(R1 2 -R2 2 )*H0;

[0028] △H*τ≥G≥△H*μ;

[0029] Among them, R1 is the outer diameter of the support block; R2 is the inner diameter of the support block; D1 is the outer diameter of the first groove; D2 is the inner diameter of the first groove; τ is the upper limit correction coefficient of the assembly height direction tolerance, which is 0.85~1; μ is the lower limit correction coefficient of the assembly height direction tolerance, which is 1.05~1.2.

[0030] In an optional embodiment, it further includes a bottom guard plate, which is arranged on a side of the heat exchange plate away from the fixed beam; the connecting member passes through the bottom guard plate and the heat exchange plate in sequence and is connected to the fixed beam.

[0031] In an optional embodiment, a protrusion is provided on a side of the bottom guard plate facing the heat exchange plate, the protrusion abuts against the heat exchange plate, and the connecting member passes through the protrusion.

[0032] In an optional embodiment, the heat exchange plate includes a first substrate and a second substrate stacked together, a heat exchange channel is formed between the first substrate and the second substrate; the fixing beam is connected to a side of the second substrate away from the first substrate;

[0033] The second substrate is provided with the first groove for mounting the supporting block.

[0034] In an optional embodiment, a second groove for mounting a connecting member is formed on the second substrate, and the first groove is arranged around the outer circumference of the second groove; the connecting member passes through the first substrate and the second substrate and is fixedly connected to the fixing beam.

[0035] In an optional embodiment, the bottom of the first groove is welded to the first substrate, and the bottom of the second groove is welded to the first substrate.

[0036] In a second aspect, the present invention provides a battery pack, comprising a battery and a box as described in any one of the aforementioned embodiments, wherein the battery is disposed in a housing cavity formed by the heat exchange plate and the frame, and the battery abuts against the fixing beam.

[0037] In a third aspect, the present invention provides an electrical device, comprising a battery pack as described in the aforementioned embodiment.

[0038] The beneficial effects of the embodiments of the present invention include, for example:

[0039] The box body provided in the embodiment of the present invention forms an air gap between the heat exchange plate and the fixed beam by arranging a support block between the heat exchange plate and the fixed beam, so as to block the heat damage transfer between the heat exchange plate and the fixed beam, thereby reducing the overall temperature difference of the battery system and improving the energy utilization efficiency of the thermal management system.

[0040] The battery pack and the electrical device provided by the embodiments of the present invention are conducive to blocking the heat transfer between the heat exchange plate and the fixed beam, reducing the overall temperature difference of the battery system, and improving the energy utilization efficiency of the thermal management system. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0042] Figure 1 A schematic diagram of the structure of a box provided by an embodiment of the present invention;

[0043] Figure 2 for Figure 1 Schematic diagram of the structure of the split fixed beam and heat exchange plate;

[0044] Figure 3 for Figure 2 A local enlarged schematic diagram of the middle A;

[0045] Figure 4 A schematic diagram of the disassembled structure of a box provided in an embodiment of the present invention;

[0046] Figure 5 for Figure 4 A partial enlarged schematic diagram of point B in the middle;

[0047] Figure 6 A schematic cross-sectional structure diagram of a box provided by an embodiment of the present invention;

[0048] Figure 7 for Figure 6 A partial enlarged schematic diagram of point C in the middle;

[0049] Figure 8 Another schematic cross-sectional structure diagram of a box provided by an embodiment of the present invention;

[0050] Fig. 9 for Figure 8 A partial enlarged schematic diagram of point D in the middle;

[0051] Fig.10 A schematic cross-sectional structure diagram of the support block of the box provided by the embodiment of the present invention being installed with the first annular protrusion and the second annular protrusion before deformation;

[0052] Fig.11 A schematic diagram of the cross-sectional structure of the first annular protrusion and the second annular protrusion of the box body provided in an embodiment of the present invention;

[0053] Fig.12 This is a schematic diagram of the cross-sectional structure of the support block of the box body provided by an embodiment of the present invention before and after deformation.

[0054] Icons: 100-box; 101-frame; 103-accommodation area; 110-heat exchange plate; 111-first substrate; 112-second substrate; 113-first groove; 114-second groove; 115-first annular protrusion; 116-second annular protrusion; 117-mounting hole; 118-heat exchange channel; 120-fixing beam; 121-threaded sleeve; 130-support block; 140-connector; 141-gasket; 150-bottom guard plate; 151-protrusion. DETAILED DESCRIPTION

[0055] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0056] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0057] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0058] In the description of the present invention, it should be noted that if the terms "upper", "lower", "inside", "outside", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the drawings, or is the orientation or position relationship in which the product of the invention is usually placed when used. It is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0059] In addition, the terms “first”, “second”, etc., if used, are merely used to distinguish between the descriptions and should not be understood as indicating or implying relative importance.

[0060] It should be noted that, in the absence of conflict, the features in the embodiments of the present invention may be combined with each other.

[0061] This embodiment proposes a box structure, which, under the premise of ensuring the overall structural strength of the box and the flatness of the heat exchange plate installation, utilizes the air gap insulation design and the sealing support characteristics of the support block to block the heat damage transfer between the heat exchange plate and the fixed beam, thereby reducing the overall temperature difference of the battery system and improving the energy utilization efficiency of the thermal management system.

[0062] Please refer to Figures 1 to 3 , this embodiment provides a box 100, including a frame 101, a heat exchange plate 110, a fixed beam 120 and a support block 130. The heat exchange plate 110 is fixed on the frame 101; the heat exchange plate 110 and the frame 101 form a receiving cavity. The fixed beam 120 is connected to the heat exchange plate 110; the fixed beam 120 is used to divide the receiving cavity into a plurality of receiving areas 103, each of which is used to receive a battery. The support block 130 is arranged between the heat exchange plate 110 and the fixed beam 120, so that there is an air gap between the fixed beam 120 and the heat exchange plate 110. By arranging the support block 130 between the heat exchange plate 110 and the fixed beam 120, an air gap is formed between the heat exchange plate 110 and the fixed beam 120, so as to block the heat transfer between the heat exchange plate 110 and the fixed beam 120, thereby reducing the overall temperature difference of the battery system and improving the energy utilization efficiency of the thermal management system.

[0063] Optionally, the projection area of ​​the fixing beam 120 on the heat exchange plate 110 is S1, the projection area of ​​the support block 130 on the heat exchange plate 110 is S2, and S1 and S2 satisfy the following relationship:

[0064]

[0065] In this way, the spacing area between the fixed beam 120 and the heat exchange plate 110 can be made large enough, which is beneficial to reducing the heat exchange between the fixed beam 120 and the heat exchange plate 110 .

[0066] Combination Figure 4 and Figure 5 Optionally, a first groove 113 is provided on one side of the heat exchange plate 110 facing the fixed beam 120, and a support block 130 is provided in the first groove 113, and the height of the support block 130 is greater than the depth of the first groove 113. This is conducive to forming an air gap between the fixed beam 120 and the heat exchange plate 110. In this embodiment, the depth of the first groove 113 is 1.2 mm to 4.5 mm.

[0067] Optionally, a first annular protrusion 115 and a second annular protrusion 116 are provided on one side of the heat exchange plate 110 facing the fixed beam 120; a first groove 113 is formed between the first annular protrusion 115 and the second annular protrusion 116. The support block 130 is installed in the first groove 113. In this embodiment, the support block 130 is an annular structure, and its cross-sectional size and shape are adapted to the cross-sectional size and shape of the first groove 113. Among them, the first annular protrusion 115 is located at the periphery of the second annular protrusion 116. The first annular protrusion 115 and the second annular protrusion 116 can limit the support block 130, limit the height and width of the support block 130, and ensure that there is an air gap between the heat exchange plate 110 and the fixed beam 120. It can also prevent the support block 130 from being too wide and too thin after being pressed, thereby increasing the contact area between the support block 130 and the fixed beam 120. Optionally, the structure of the first annular protrusion 115, the second annular protrusion 116 and the first groove 113 can be formed by stamping.

[0068] Combination Figures 6 to 9 , the support block 130 is made of elastic material, such as rubber. Optionally, when the connecting member 140 is connected to the heat exchange plate 110 and the fixed beam 120, the heat exchange plate 110 and the fixed beam 120 apply an extrusion force F to the support block 130. The support block 130 will deform under the extrusion force F. The distance between the first annular protrusion 115 and the second annular protrusion 116 is greater than the width of the support block 130 before deformation, that is, the width of the first groove 113 is greater than the width of the support block 130 before deformation. This can provide a suitable deformation space for the support block 130, ensuring that when the support block 130 is compressed and deformed, the first groove 113 can accommodate the increased space in the width direction caused by the deformation of the support block 130 in the height direction.

[0069] It should be noted that after the support block 130 is squeezed and deformed, its height decreases and its width increases. After deformation, the fixed beam 120 and the heat exchange plate 110 are not in contact, and there is an air gap G of a certain height between the two. Optionally, the cross-section of the support block 130 is rectangular, square or circular, preferably square. The contact area of ​​the circular cross-section is relatively smaller after compression. The support block 130 has compression rebound performance and a certain hardness, which is greater than that of conventional foam. At the same time, the thermal conductivity is relatively small, which can be selected as 0.1 to 0.3 W / mk. Therefore, it has better thermal insulation performance.

[0070] Optionally, the housing 100 further includes a connector 140. The connector 140 is sequentially inserted through the heat exchange plate 110 and the fixed beam 120, and the connector 140 is located on the side of the second annular protrusion 116 away from the support block 130. That is, the connector 140 is located in the annular area formed by the second annular protrusion 116, and the connector 140 is located in the middle of the support block 130. In this embodiment, the connector 140 is a rivet bolt. Optionally, the support block 130 is deformed under the extrusion force F, and the distance between the first annular protrusion 115 and the second annular protrusion 116 is equal to the width of the support block 130 after deformation.

[0071] The supporting block 130 in this embodiment has the following functions:

[0072] First, the support block 130 is installed in the first groove 113 of the heat exchange plate 110, and the height is greater than the depth of the first groove 113. Therefore, after the rivet bolts are tightened, it can ensure that there is an air gap, that is, an air insulation layer, between the heat exchange plate 110 and the fixed beam 120. In addition, the thermal conductivity of the material of the support block 130 itself is also low, which can completely block the heat transfer from the heat exchange plate 110 to the fixed beam 120, which is conducive to improving the temperature uniformity of the entire battery.

[0073] Second, the support block 130 has a certain hardness, which is greater than that of conventional foam. Therefore, even under the strength of the rivet bolts, it can still directly support the installation area of ​​the heat exchange plate 110 and the fixed beam 120, thereby ensuring that the heat exchange plate 110 at the installation position will not be greatly deformed upward, solving the problem of the overall flatness of the heat exchange plate 110 decreasing after installation in the prior art solution.

[0074] Third, under the pre-tightening force of the rivet bolts, the support block 130 will be slightly compressed and deformed. Since the support block 130 is completely embedded in the first groove 113 of the heat exchange plate 110, the compression deformation makes the support block 130 fit more closely with the fixed beam 120 and the heat exchange plate 110, respectively, thereby isolating the internal space of the box body 100 from the rivet bolt holes, which can play a role in strengthening the secondary seal. In other words, the support block 130 seals and isolates the space area outside the first annular protrusion 115 and the space area within the second annular protrusion 116, which can play a role in secondary sealing. In this way, the risk of leakage during the vibration of the battery pack or when the seal between the external box body 100 and the bottom guard plate 150 fails can be avoided.

[0075] In order to meet the above functional requirements of the support block 130 and give full play to the role of the support block 130, the support block 130 must meet the following principles when designing its structural dimensions.

[0076] Combination Figures 10 to 12Optionally, the connecting member 140 is a bolt, the bolt diameter is d, and the bolt torque is M; the height of the support block 130 before deformation is H0, and the height after deformation is H1; each parameter satisfies the following relationship:

[0077] F = M / (k * d);

[0078] △H=F / (λ*EX)=H0-H1;

[0079] Wherein, k is the preload coefficient of the bolt; △H is the deformation of the support block 130 in the height direction; λ is the aging resilience energy attenuation coefficient of the support block 130, which is 0.85 to 0.95; EX is the elastic modulus of the support block 130, and * represents the multiplication sign.

[0080] Optionally, after the support block 130 is deformed, the air gap height between the heat exchange plate 110 and the fixed beam 120 is G. Optionally, the air gap height G is 1 mm to 3 mm. In this way, the heat of the heat exchange plate 110 can be completely blocked from being transferred to the fixed beam 120, which can greatly improve the harm of heat damage to the temperature difference of the battery cell.

[0081] Based on the fact that the volume of the support block 130 before and after deformation remains unchanged, the following relationship is satisfied: {(R1-R2)*(H0-△H)+[(D1-R1) 2 +(D2-R2) 2 ]*π}*(D1+D2)=(R1 2 -R2 2 )*H0;

[0082] △H*τ≥G≥△H*μ;

[0083] Among them, R1 is the outer diameter of the support block 130; R2 is the inner diameter of the support block 130; D1 is the outer diameter of the first groove 113; D2 is the inner diameter of the first groove 113; τ is the upper limit correction coefficient of the assembly height direction tolerance, which is 0.85~1; μ is the lower limit correction coefficient of the assembly height direction tolerance, which is 1.05~1.2.

[0084] In this way, it can be ensured that under the assembly tolerance, that is, the limit deviation and the installation process, the installation can be smoothly performed and the gap height G exists, that is, the fixing beam 120 and the heat exchange plate 110 will not be in contact with each other.

[0085] It can be understood that the thermal conductivity of air is smaller than that of the support block 130. The support block 130 has a certain hardness to prevent the heat exchange plate 110 from deforming. The material hardness of the support block 130 is greater than that of the foam. In order to ensure the air insulation effect, the contact area between the top surface of the support block 130 and the fixed beam 120 should be minimized. This is because if a protruding structure is provided on the top of the support block 130 to isolate the fixed beam 120 and the top surface of the annular protrusion (including the first annular protrusion 115 and the second annular protrusion 116), the thermal insulation effect is reduced because the material thermal conductivity of the support block 130 is greater than that of air. Therefore, the support block 130 only needs to be set as a column, and the contact area between the top surface of the column and the fixed beam 120 should be minimized.

[0086] Optionally, the support block 130 may adopt a hollow structure to further reduce the contact area between the support block 130 and the fixed beam 120 .

[0087] It should be noted that the air gap height G has little effect on heat conduction because the heat transfer coefficient is very small, and it is sufficient to ensure the air gap height G. However, if the medium temperature in the heat exchange plate 110 is very high, the air gap height G needs to be increased accordingly.

[0088] The thermal conductivity of air is small, and the heat conduction is small, but there is heat convection. The effect of the fixed beam 120 on the temperature difference of the battery cell is mainly due to solid-state heat conduction, because even under low temperature conditions, the maximum temperature of the heat exchange plate 110 is only about 40°C, and the surface convective heat transfer is small, and it is only natural convection. The surface temperature of the heat exchange plate 110 is relatively low, not hundreds or thousands of degrees high. Only at higher temperatures and forced air cooling, the convection effect is significant. The main factors affecting heat convection include temperature difference and natural convection heat transfer coefficient. The greater the flow rate, the greater the convection heat transfer coefficient. In this embodiment, it is used in a closed battery box 100, and the convection heat transfer coefficient is small.

[0089] Optionally, the housing 100 further includes a bottom guard plate 150, which is disposed on a side of the heat exchange plate 110 away from the fixed beam 120. The connector 140 passes through the bottom guard plate 150 and the heat exchange plate 110 in sequence and is connected to the fixed beam 120. The bottom guard plate 150 and the heat exchange plate 110 are respectively provided with corresponding mounting holes 117, and the mounting holes 117 can be passed through by the connector 140. The fixed beam 120 is embedded with a threaded sleeve 121 corresponding to the mounting hole 117. During installation, the gasket 141 is sleeved on the bolt, and the bolt passes through the mounting holes 117 of the bottom guard plate 150 and the heat exchange plate 110 in sequence, and extends into the fixed beam 120 to be threadedly connected with the threaded sleeve 121, so as to realize the locking and fixing of the bottom guard plate 150, the heat exchange plate 110 and the fixed beam 120.

[0090] Optionally, a protrusion 151 is provided on one side of the bottom guard plate 150 facing the heat exchange plate 110, the protrusion 151 abuts against the heat exchange plate 110, and the connector 140 passes through the protrusion 151. That is, the mounting hole 117 of the bottom guard plate 150 is provided on the protrusion 151. The provision of the protrusion 151 is conducive to the positioning of the connector 140 and to improving the structural strength of the bottom guard plate 150 at the connection.

[0091] Optionally, the heat exchange plate 110 includes a first substrate 111 and a second substrate 112 stacked together, with a heat exchange channel 118 formed between the first substrate 111 and the second substrate 112. The fixing beam 120 is connected to a side of the second substrate 112 away from the first substrate 111. The second substrate 112 is provided with a first groove 113 for mounting a support block 130.

[0092] Optionally, a second groove 114 for mounting a connector 140 is formed on the second substrate 112, and the first groove 113 is arranged around the outer periphery of the second groove 114. The connector 140 passes through the first substrate 111 and the second substrate 112 and is fixedly connected to the fixing beam 120. The provision of the second groove 114 is conducive to improving the structural strength of the heat exchange plate 110. The number of the second grooves 114 is not limited and can be provided as needed.

[0093] Optionally, the bottom of the first groove 113 is welded to the first substrate 111, and the bottom of the second groove 114 is welded to the first substrate 111, which is beneficial to improving the structural strength. Brazing can be used for each.

[0094] The box body 100 provided in this embodiment blocks the heat transfer between the heat exchange plate 110 and the fixed beam 120 while ensuring the overall structural strength and installation flatness of the box body 100. It should be understood that the overall structural strength here is mainly determined by the number of fixed rivet bolts and their torque. In the non-bolt fixing area of ​​the prior art solution, even if the bottom of the beam fits the heat exchange plate 110, there is no stress transfer between the two in the structure, that is, the beam is still fixed to the heat exchange plate 110 by the fixing bolts, and the structural strength will not change if the bolt torque remains unchanged.

[0095] In this embodiment, the hardness of the support block 130 is greater than that of the heat insulation pad, and supports the fixed beam 120, prevents the heat exchange plate 110 from deforming, and improves the structural strength of the heat exchange plate 110. Ensure that there is an air gap between the fixed beam 120 and the heat exchange plate 110 to block the heat transfer between the heat exchange plate 110 and the fixed beam 120. The support block 130 not only supports, but also strengthens the seal, improves the sealing effect, and reduces the risk of leakage.

[0096] The design of the second groove 114 on the heat exchange plate 110 and the welding of the bottom of the first groove 113 and the bottom of the second groove 114 to the first substrate 111 respectively greatly improve the structural strength of the heat exchange plate 110, and the bottom guard plate 150 and the protrusion 151 on the bottom guard plate 150 also further improve the structural strength of the heat exchange plate 110.

[0097] The embodiment of the present invention provides a battery pack, including a battery and the above-mentioned box 100, wherein the battery is disposed in a receiving cavity formed by a heat exchange plate 110 and a frame 101, and the battery abuts against a fixed beam 120. Since there is an air gap between the heat exchange plate 110 and the fixed beam 120, the heat transfer between the heat exchange plate 110 and the fixed beam 120 is blocked, so the temperature difference between the battery close to the fixed beam 120 and the middle battery is smaller, the overall battery has better temperature uniformity, and the thermal management efficiency is higher.

[0098] The embodiment of the present invention also provides an electrical device, including the aforementioned battery pack. The electrical device can be in various forms, for example, a mobile phone, a portable device, a laptop computer, an electric vehicle, an electric car, a ship, a spacecraft, an electric toy, an electric tool, or various household appliances, etc. For example, spacecraft include airplanes, rockets, space shuttles, and spacecrafts, etc. Electric toys include fixed or mobile electric toys, for example, game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools, and railway electric tools, for example, electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc.

[0099] In summary, the box 100, the battery pack and the electric device provided by the embodiment of the present invention have the following beneficial effects, including:

[0100] The box 100 provided in the embodiment of the present invention forms an air gap between the heat exchange plate 110 and the fixed beam 120 by setting a support block 130 between the heat exchange plate 110 and the fixed beam 120, so as to block the heat transfer between the heat exchange plate 110 and the fixed beam 120, thereby reducing the overall temperature difference of the battery system and improving the energy utilization efficiency of the thermal management system. In addition, the support block 130 also has supporting and sealing functions. The ingenious design of the heat exchange plate 110 and the bottom guard plate 150 improves the overall structural strength of the box 100.

[0101] The battery pack and the electrical device provided by the embodiments of the present invention are conducive to blocking the heat transfer between the heat exchange plate 110 and the fixed beam 120, reducing the overall temperature difference of the battery system, and improving the energy utilization efficiency of the thermal management system.

[0102] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A box, characterized in that: include: Frame (101); A heat exchange plate (110), wherein the heat exchange plate (110) is fixed on the frame (101); the heat exchange plate (110) and the frame (101) form a receiving cavity; A fixed beam (120), the fixed beam (120) being connected to the heat exchange plate (110); the fixed beam (120) being used to divide the accommodating cavity into a plurality of accommodating areas (103), each accommodating area (103) being used to accommodate a battery; A support block (130) is provided between the heat exchange plate (110) and the fixed beam (120) so that an air gap exists between the fixed beam (120) and the heat exchange plate (110).

2. The box according to claim 1, characterized in that: The projection area of ​​the fixed beam (120) on the heat exchange plate (110) is S1, and the projection area of ​​the support block (130) on the heat exchange plate (110) is S2. S1 and S2 satisfy the following relationship:

3. The box according to claim 1, characterized in that: A first groove (113) is provided on a side of the heat exchange plate (110) facing the fixed beam (120), the support block (130) is arranged in the first groove (113), and the height of the support block (130) is greater than the depth of the first groove (113).

4. The box according to claim 3, characterized in that: A first annular protrusion (115) and a second annular protrusion (116) are provided on one side of the heat exchange plate (110) facing the fixed beam (120); the first groove (113) is formed between the first annular protrusion (115) and the second annular protrusion (116); The support block (130) is made of elastic material, and the distance between the first annular protrusion (115) and the second annular protrusion (116) is greater than the width of the support block (130) before deformation.

5. The box according to claim 4, characterized in that: It also includes a connecting piece (140), which is sequentially inserted through the heat exchange plate (110) and the fixed beam (120), and the connecting piece (140) is located on a side of the second annular protrusion (116) away from the support block (130).

6. The box according to claim 5, characterized in that: When the connecting member (140) is in a state of connecting the heat exchange plate (110) and the fixed beam (120), the heat exchange plate (110) and the fixed beam (120) apply a squeezing force F to the support block (130); the support block (130) is deformed under the squeezing force F, and the distance between the first annular protrusion (115) and the second annular protrusion (116) is equal to the width of the support block (130) after deformation.

7. The box according to claim 6, characterized in that: The connecting member (140) comprises a bolt, the bolt diameter is d, and the bolt torque is M; the height of the support block (130) before deformation is H0, and the height after deformation is H1; each parameter satisfies the following relationship: F = M / (k * d); △H=F / (λ*EX)=H0-H1; Wherein, k is the preload coefficient of the bolt; ΔH is the deformation of the support block (130) in the height direction; λ is the aging resilience energy attenuation coefficient of the support block (130), which is 0.85 to 0.95; EX is the elastic modulus of the support block (130), and * represents a multiplication sign.

8. The box according to claim 7, characterized in that: After the support block (130) is deformed, the height of the air gap between the heat exchange plate (110) and the fixed beam (120) is G. Based on the fact that the volume of the support block (130) before and after deformation remains unchanged, the following relationship is satisfied: <h2 style=";text-align:left;direction:ltr">{(R1-R2)*(H0-△H)+[(D1-R1)<h2 style=";text-align:left;direction:ltr"> 2 <h2 style=";text-align:left;direction:ltr"> +(D2-R2)<h2 style=";text-align:left;direction:ltr"> 2 <h2 style=";text-align:left;direction:ltr"> ]*π}*(D1+D2)=(R1<h2 style=";text-align:left;direction:ltr"> 2 <h2 style=";text-align:left;direction:ltr"> -R2<h2 style=";text-align:left;direction:ltr"> 2 <h2 style=";text-align:left;direction:ltr"> )*H0; △H*τ≥G≥△H*μ; Among them, R1 is the outer diameter of the support block (130); R2 is the inner diameter of the support block (130); D1 is the outer diameter of the first groove (113); D2 is the inner diameter of the first groove (113); τ is the upper limit correction coefficient of the assembly height direction tolerance, which is 0.85 to 1; μ is the lower limit correction coefficient of the assembly height direction tolerance, which is 1.05 to 1.

2.

9. The box according to claim 5, characterized in that: The heat exchanger further comprises a bottom guard plate (150), wherein the bottom guard plate (150) is arranged on a side of the heat exchange plate (110) away from the fixed beam (120); the connecting member (140) passes through the bottom guard plate (150) and the heat exchange plate (110) in sequence, and is connected to the fixed beam (120).

10. The box according to claim 9, characterized in that: A protrusion (151) is provided on a side of the bottom guard plate (150) facing the heat exchange plate (110), the protrusion (151) abuts against the heat exchange plate (110), and the connecting piece (140) passes through the protrusion (151).

11. The box according to claim 3, characterized in that: The heat exchange plate (110) comprises a first substrate (111) and a second substrate (112) which are stacked, and a heat exchange channel (118) is formed between the first substrate (111) and the second substrate (112); the fixing beam (120) is connected to a side of the second substrate (112) away from the first substrate (111); The second substrate (112) is provided with the first groove (113) for mounting the supporting block (130).

12. The box according to claim 11, characterized in that: A second groove (114) for mounting a connecting member (140) is formed on the second substrate (112), and the first groove (113) is arranged around the outer circumference of the second groove (114); the connecting member (140) passes through the first substrate (111) and the second substrate (112) and is fixedly connected to the fixing beam (120).

13. The box according to claim 12, characterized in that: The groove bottom of the first groove (113) is welded to the first substrate (111), and the groove bottom of the second groove (114) is welded to the first substrate (111).

14. A battery pack, characterized in that: It comprises a battery and a box body as claimed in any one of claims 1 to 13, wherein the battery is arranged in a housing cavity formed by the heat exchange plate (110) and the frame body (101), and the battery is in contact with the fixed beam (120).

15. An electrical device, characterized in that: Comprising the battery pack as claimed in claim 14.

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