Functional module and battery box

Abstract

The invention belongs to the technical field of battery boxes, and particularly relates to a functional module and a battery box. The functional module provided by the invention comprises a module body internally provided with a first heat insulation sealing cavity, the volume of the first heat insulation sealing cavity accounts for more than one third of the total volume of the module body, and air is sealed in the first heat insulation sealing cavity to reduce heat conduction of adjacent battery modules. The battery box provided by the invention comprises a bottom plate, a battery module and a functional module, wherein the battery module and the functional module are arranged on the bottom plate. The first heat insulation sealing cavity with the volume accounting for more than one third of the total volume of the module and sealed with the air is formed in the module body of the functional module, only the air is sealed in the first heat insulation sealing cavity, other heat preservation filler does not need to be arranged, and the weight and the cost of the functional module are effectively reduced; the sealed air is in a non-circulating state, so that air convection and conduction heat dissipation are eliminated, a heat dissipation path of the heat of the battery module is blocked, the heat exchange of the battery module is effectively reduced, and the heat preservation performance of the battery box is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of battery boxes, and in particular relates to a functional module and a battery box. Background Art

[0002] Battery module platformization means that as many parts as possible are universalized, and universal design can effectively shorten the development cycle, save costs, streamline production lines and improve production efficiency. In the process of developing battery boxes for electric vehicles with different power requirements, battery boxes with different power configurations need to match different module body size modules, and different molds are also required for matching during production, which leads to a significant increase in the cycle and cost of R&D and mold opening. Therefore, the common practice is to fill a battery box with different numbers of battery modules to meet the different power requirements of the vehicle; however, when matching from large-capacity and multi-module to small-capacity and small-module, there will be a lack of modules in some parts of the battery box, forming certain empty installation positions. Since there is air in the empty installation positions, and the density and specific heat capacity of the air are smaller than those of the battery modules, under low temperature conditions, the air in the empty installation positions is quickly cooled by the external environment through the metal bottom plate of the battery box, and natural convection heat exchange is formed with the modules on both sides of the empty installation positions due to the temperature difference, causing the air temperature in the empty installation positions to drop faster, resulting in a decrease in the thermal insulation performance of the battery box. At the same time, the accelerated cooling of the local modules causes the temperature difference consistency of the entire battery box to deteriorate.

[0003] As an improvement, a Chinese invention patent application with application publication number CN116598682A discloses a battery pack, which includes a receiving cavity, and the receiving cavity is provided with at least two mounting positions for placing battery modules, at least one mounting position is an empty mounting position without a battery module installed, and a heat capacity compensation body is provided on at least one empty mounting position. With this arrangement, there is no need to change the size and shape of the battery box and the cavity size design of the internal receiving cavity, and the empty mounting position of the battery box receiving cavity is filled with a heat capacity compensation body, thereby improving the thermal insulation performance of the battery box.

[0004] In actual applications, this solution has found that paraffin with a large heat capacity is used as the thermal insulation filler of the heat capacity compensation body. However, if the heat capacity is to be close to that of the module, its weight needs to be at least 1 / 3 of the weight of the module, which is not conducive to the weight and cost control of the battery box. Summary of the invention

[0005] The purpose of the present invention is to provide a functional module to solve the problem that the weight and cost of the battery box are difficult to control due to the use of a heat capacity compensator to improve the thermal insulation performance of the battery box in the existing battery box technology. The purpose of the present invention is also to provide a battery box to solve the same problem as above.

[0006] To achieve the above objectives, the functional module in the present invention adopts the following technical solutions:

[0007] A functional module comprises a module body with a first heat-insulating sealed cavity inside, the volume of the first heat-insulating sealed cavity accounts for more than one third of the total volume of the module body, and air is sealed in the first heat-insulating sealed cavity to reduce heat conduction of adjacent battery modules.

[0008] The beneficial effect of the above technical solution is that: the present invention is a pioneering invention, by setting a first heat-insulating sealed cavity with a volume of more than one-third of the total volume of the module inside the module body of the functional module, and sealing air in the first heat-insulating sealed cavity to reduce the heat conduction of adjacent battery modules. Through such a setting, the first heat-insulating sealed cavity sealed with air is set inside the module body of the functional module. Since only air with a low thermal conductivity is sealed in the first heat-insulating sealed cavity, no other heat-insulating fillers need to be set, thereby effectively reducing the weight of the functional module and thus reducing the weight of the battery box, and reducing the manufacturing cost of the functional module; the air sealed in the first heat-insulating sealed cavity is in a non-circulating state, thereby eliminating air convection, reducing conduction heat dissipation, and reducing the rate at which the heat of the battery module is conducted to the functional module, thereby blocking the path of the heat of the battery module being transferred to the bottom plate of the battery box through the functional module for heat dissipation, thereby achieving the purpose of reducing the heat exchange of the battery module, enhancing the insulation effect of the battery box, and improving the insulation performance of the battery box.

[0009] Furthermore, a groove is provided in the module body, a heat insulating plate is fixed on the groove wall of the groove, and the heat insulating plate and the groove together enclose the first heat insulating sealed cavity.

[0010] The beneficial effects of the above technical solution are: by arranging a groove in the module body, the weight of the functional module is effectively reduced, which helps to reduce the weight of the battery box and at the same time reduces the manufacturing cost of the functional module; by fixing the insulation board on the groove wall of the groove to form a first insulation sealed cavity together with the groove, the structure of the insulation sealed cavity is simple, making the functional module easy to manufacture.

[0011] Furthermore, the notch of the groove is arranged downward, and there is a gap between the insulation board and the lower end surface of the module body. A sealing member for sealing with the bottom plate of the battery box is fixed on the lower end surface of the module body to form a second insulation sealing cavity between the insulation board and the bottom plate.

[0012] The beneficial effect of the above technical solution is that the notch of the groove is arranged toward the bottom plate of the battery box, and at the same time, a certain interval is provided between the heat insulation plate and the lower end surface of the module body, and a seal for sealing with the bottom plate of the battery box is fixed on the lower end surface of the module body, thereby forming a second heat-insulating sealed cavity between the heat insulation plate and the bottom plate. Such a setting method has a simple structure, is easy to implement, and can ensure the sealing of the second heat-insulating sealed cavity through the seal. In this way, a double-layer air insulation sealing structure including the first heat-insulating sealed cavity, the heat insulation plate, and the second heat-insulating sealed cavity is formed in the module body, which effectively isolates the path for heat conduction and heat dissipation from the bottom plate of the battery box through the functional module for the battery modules on both sides, thereby enhancing the insulation effect of the battery box and improving the insulation performance of the battery box.

[0013] Furthermore, the width of the sealing member is smaller than the wall thickness of the groove, and the inner edge of the sealing member is aligned with the groove wall of the groove.

[0014] The beneficial effects of the above technical solution are: the width of the seal is smaller than the wall thickness of the groove, so that the seal can be completely located within the range of the groove wall thickness of the groove, which helps to improve the sealing between the module body and the bottom plate of the battery box, and also avoids the influence of the seal on the assembly of the battery module; the size difference between the width of the seal and the wall thickness of the groove forms a certain gap, which is convenient for subsequent filling of thermal conductive glue to further improve the sealing between the module body and the bottom plate of the battery box. The inner edge of the seal is aligned with the groove wall of the groove, which makes it easy to realize the positioning and assembly of the seal and the module body when fixing, and also avoids the seal extending into the groove to affect the sealing between the module body and the bottom plate of the battery box.

[0015] Furthermore, a step is provided in the groove, and the heat insulation board is pasted on the step.

[0016] The beneficial effects of the above technical solution are: the step is arranged in the groove, the structure is simple, easy to process, and it is easy to position and assemble the insulation board, and it is also convenient for the insulation board and the groove to form an insulating sealed cavity; the pasting method is simple to operate and it is easy to ensure the sealing of the insulating sealed cavity.

[0017] Furthermore, at least one support beam is arranged between the groove walls corresponding to the two side surfaces of the module body for cooperating with the adjacent battery modules on both sides, and continuous steps are arranged on the support beam and the groove walls, and the heat insulation board is pasted on the steps.

[0018] The beneficial effects of the above technical solution are: such a setting can form structural support for the module body through the support beam to increase the structural strength of the module body, avoid expansion at the end of the battery life and break or fracture the functional module, thereby avoiding damage to the sealing structure of the module body; by setting continuous steps on the support beam and the groove wall, a small area of ​​insulation board can be used for pasting, which facilitates the assembly and positioning of the insulation board.

[0019] Furthermore, at least one supporting beam is arranged between the groove walls of the grooves corresponding to the two side surfaces of the module body for cooperating with the adjacent battery modules on both sides.

[0020] The beneficial effect of the above technical solution is that such a setting can form structural support for the module body through the support beam to increase the structural strength of the module body, avoid expansion at the end of the battery life and crush or fracture the functional module, thereby avoiding damage to the sealing structure of the module body.

[0021] Furthermore, fireproof coatings are respectively provided on two side surfaces of the module body for cooperating with the adjacent battery modules on both sides.

[0022] The beneficial effects of the above technical solution are: fire-resistant coatings are respectively provided on the two sides of the module body for cooperating with the adjacent battery modules on both sides, the process is simple and easy to implement; when thermal runaway occurs in the battery modules on both sides, the fire-resistant coating on the surface of the functional module can be relied on to effectively isolate the heat diffusion between the battery modules on both sides and control the direction of the fire, delaying the heat spread time, thereby improving the fire resistance of the battery box.

[0023] Furthermore, a fixing slot for supporting the conductive bar of the battery module and for fixing the wiring harness is provided on the top of the functional module.

[0024] The beneficial effects of the above technical solution are: the fixed slot is directly arranged on the top of the functional module, and the wiring harness and conductive bus across the module can be fixed through the fixed slot, avoiding the risk of arcing and sparking caused by the wiring harness and conductive bus shaking without support. The process installation is simple and the fixation is reliable. Compared with the traditional fixed bracket, the process and cost of welding or bonding the fixed bracket to the module body are omitted.

[0025] To achieve the above purpose, the battery box in the present invention adopts the following technical solutions:

[0026] A battery box includes a base plate and a battery module and a functional module arranged on the base plate. The functional module includes a module body with a first insulating sealed cavity arranged inside. The volume of the first insulating sealed cavity accounts for more than one third of the total volume of the module body. Air is sealed in the first insulating sealed cavity to reduce heat conduction between adjacent battery modules.

[0027] The beneficial effect of the above technical solution is that: the present invention is a pioneering invention, by setting a first heat-insulating sealed cavity with a volume of more than one-third of the total volume of the module inside the module body of the functional module, and sealing air in the first heat-insulating sealed cavity to reduce the heat conduction of adjacent battery modules. Through such a setting, the first heat-insulating sealed cavity sealed with air is set inside the module body of the functional module. Since only air with a low thermal conductivity is sealed in the first heat-insulating sealed cavity, no other heat-insulating fillers need to be set, thereby effectively reducing the weight of the functional module and thus reducing the weight of the battery box, and reducing the manufacturing cost of the functional module; the air sealed in the first heat-insulating sealed cavity is in a non-circulating state, thereby eliminating air convection, reducing conduction heat dissipation, and reducing the rate at which the heat of the battery module is conducted to the functional module, thereby blocking the path of the heat of the battery module being transferred to the bottom plate of the battery box through the functional module for heat dissipation, thereby achieving the purpose of reducing the heat exchange of the battery module, enhancing the insulation effect of the battery box, and improving the insulation performance of the battery box.

[0028] Furthermore, a groove is provided in the module body, a heat insulating plate is fixed on the groove wall of the groove, and the heat insulating plate and the groove together enclose the first heat insulating sealed cavity.

[0029] The beneficial effects of the above technical solution are: by arranging a groove in the module body, the weight of the functional module is effectively reduced, which helps to reduce the weight of the battery box and at the same time reduces the manufacturing cost of the functional module; by fixing the insulation board on the groove wall of the groove to form a first insulation sealed cavity together with the groove, the structure of the insulation sealed cavity is simple, making the functional module easy to manufacture.

[0030] Furthermore, the notch of the groove is arranged downward, and there is a gap between the insulation board and the lower end surface of the module body. A sealing member for sealing with the bottom plate of the battery box is fixed on the lower end surface of the module body to form a second insulation sealing cavity between the insulation board and the bottom plate.

[0031] The beneficial effect of the above technical solution is that the notch of the groove is arranged toward the bottom plate of the battery box, and at the same time, a certain interval is provided between the heat insulation plate and the lower end surface of the module body, and a seal for sealing with the bottom plate of the battery box is fixed on the lower end surface of the module body, thereby forming a second heat-insulating sealed cavity between the heat insulation plate and the bottom plate. Such a setting method has a simple structure, is easy to implement, and can ensure the sealing of the second heat-insulating sealed cavity through the seal. In this way, a double-layer air insulation sealing structure including the first heat-insulating sealed cavity, the heat insulation plate, and the second heat-insulating sealed cavity is formed in the module body, which effectively isolates the path for heat conduction and heat dissipation from the bottom plate of the battery box through the functional module for the battery modules on both sides, thereby enhancing the insulation effect of the battery box and improving the insulation performance of the battery box.

[0032] Furthermore, the width of the sealing member is smaller than the wall thickness of the groove, and the inner edge of the sealing member is aligned with the groove wall of the groove.

[0033] The beneficial effects of the above technical solution are: the width of the seal is smaller than the wall thickness of the groove, so that the seal can be completely located within the range of the groove wall thickness of the groove, which helps to improve the sealing between the module body and the bottom plate of the battery box, and also avoids the influence of the seal on the assembly of the battery module; the size difference between the width of the seal and the wall thickness of the groove forms a certain gap, which is convenient for subsequent filling of thermal conductive glue to further improve the sealing between the module body and the bottom plate of the battery box. The inner edge of the seal is aligned with the groove wall of the groove, which makes it easy to realize the positioning and assembly of the seal and the module body when fixing, and also avoids the seal extending into the groove to affect the sealing between the module body and the bottom plate of the battery box.

[0034] Furthermore, a step is provided in the groove, and the heat insulation board is pasted on the step.

[0035] The beneficial effects of the above technical solution are: the step is arranged in the groove, the structure is simple, easy to process, and it is easy to position and assemble the insulation board, and it is also convenient for the insulation board and the groove to form an insulating sealed cavity; the pasting method is simple to operate and it is easy to ensure the sealing of the insulating sealed cavity.

[0036] Furthermore, at least one support beam is arranged between the groove walls corresponding to the two side surfaces of the module body for cooperating with the adjacent battery modules on both sides, and continuous steps are arranged on the support beam and the groove walls, and the heat insulation board is pasted on the steps.

[0037] The beneficial effects of the above technical solution are: such a setting can form structural support for the module body through the support beam to increase the structural strength of the module body, avoid expansion at the end of the battery life and break or fracture the functional module, thereby avoiding damage to the sealing structure of the module body; by setting continuous steps on the support beam and the groove wall, a small area of ​​insulation board can be used for pasting, which facilitates the assembly and positioning of the insulation board.

[0038] Furthermore, at least one supporting beam is arranged between the groove walls of the grooves corresponding to the two side surfaces of the module body for cooperating with the adjacent battery modules on both sides.

[0039] The beneficial effect of the above technical solution is that such a setting can form structural support for the module body through the support beam to increase the structural strength of the module body, avoid expansion at the end of the battery life and crush or fracture the functional module, thereby avoiding damage to the sealing structure of the module body.

[0040] Furthermore, fireproof coatings are respectively provided on two side surfaces of the module body for cooperating with the adjacent battery modules on both sides.

[0041] The beneficial effects of the above technical solution are: fire-resistant coatings are respectively provided on the two sides of the module body for cooperating with the adjacent battery modules on both sides, the process is simple and easy to implement; when thermal runaway occurs in the battery modules on both sides, the fire-resistant coating on the surface of the functional module can be relied on to effectively isolate the heat diffusion between the battery modules on both sides and control the direction of the fire, delaying the heat spread time, thereby improving the fire resistance of the battery box.

[0042] Furthermore, a fixing slot for supporting the conductive bar of the battery module and for fixing the wiring harness is provided on the top of the functional module.

[0043] The beneficial effects of the above technical solution are: the fixed slot is directly arranged on the top of the functional module, and the wiring harness and conductive bus across the module can be fixed through the fixed slot, avoiding the risk of arcing and sparking caused by the wiring harness and conductive bus shaking without support. The process installation is simple and the fixation is reliable. Compared with the traditional fixed bracket, the process and cost of welding or bonding the fixed bracket to the module body are omitted. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 It is a partial structural diagram of the battery box in the present invention;

[0045] Figure 2 It is a structural schematic diagram of the functional module in the present invention;

[0046] Figure 3 for Figure 1 A cross-sectional view of

[0047] Figure 4 for Figure 3 Enlarged view of point A in the middle.

[0048] In the figure: 1. Base plate; 2. Battery module; 3. Functional module; 4. Flame retardant support;

[0049] 31. Module body; 32. Groove; 33. Support beam; 34. Seal; 35. Heat insulation board; 36. Wire harness fixing slot; 37. Aluminum row fixing slot; 100. First heat insulation sealing cavity; 200. Second heat insulation sealing cavity; 321. Step; 341. Gap. DETAILED DESCRIPTION

[0050] The features and performance of the present invention are further described in detail below in conjunction with the embodiments.

[0051] Embodiment 1 of the battery box of the present invention:

[0052] In the existing battery box technology, a heat capacity compensator is used to fill the empty installation position of the battery box's accommodating cavity to improve the thermal insulation performance of the battery box. However, in actual applications, paraffin with a large heat capacity is used as the thermal insulation filler of the heat capacity compensator. However, if the heat capacity is to be close to that of the module, its weight must be at least about 1 / 3 of the weight of the module, which undoubtedly increases the weight and manufacturing cost of the battery box.

[0053] To solve the above problems, the present invention provides a battery box, including a base plate and a battery module and a functional module arranged on the base plate, the functional module including a module body with a first insulating sealed cavity arranged inside, the volume of the first insulating sealed cavity accounts for more than one third of the total volume of the module body, and air is sealed in the first insulating sealed cavity to reduce heat conduction between adjacent battery modules.

[0054] The present invention provides a first heat-insulating sealed cavity sealed with air inside the module body of the functional module. Since only air with a low thermal conductivity is sealed in the first heat-insulating sealed cavity, there is no need to provide other thermal insulation fillers, thereby effectively reducing the weight of the functional module and thus reducing the weight of the battery box, and reducing the cost of the functional module; the air sealed in the first heat-insulating sealed cavity is in a non-circulating state, thereby eliminating air convection, reducing conductive heat dissipation, and reducing the rate at which heat from the battery module is conducted to the functional module, thereby blocking the path for the heat of the battery module to be transferred to the bottom plate of the battery box through the functional module for heat dissipation, thereby achieving the purpose of reducing heat exchange of the battery module, enhancing the thermal insulation effect of the battery box, and improving the thermal insulation performance of the battery box.

[0055] like Figures 1 to 4 As shown, the battery box includes a base plate 1, and a plurality of mounting positions for installing battery modules 2 are arranged on the base plate 1. In the present embodiment, six mounting positions are arranged on the base plate, and four groups of battery modules 2 are arranged on the six mounting positions. Functional modules 3 are arranged in the remaining two empty mounting positions. The battery modules 2 are located on both sides of the functional modules 3. The fixing method of the functional modules 3 in the battery box is the same as that of the battery modules 2.

[0056] The functional module 3 is box-shaped, and includes a module body 31 and an insulation board 35. Specifically, a groove 32 is provided at the bottom of the module body 31, and the groove 32 extends along the length direction of the bottom plate 1. The groove 32 has a step 321, and the insulation board 35 is fixed on the step 321; the insulation board 35 and the groove wall of the groove 32 together form a first insulation sealed cavity 100, and the first insulation sealed cavity 100 is sealed with air to reduce heat conduction between adjacent battery modules 2. In this way, by setting a groove 32 at the bottom of the functional module 3, only air with a low thermal conductivity is sealed in the first insulating sealed cavity 100, and there is no need to set other insulating fillers, which effectively reduces the weight of the functional module 3 and saves manufacturing costs; because the air sealed in the first insulating sealed cavity 100 is in a non-circulating state, air convection is eliminated, and conductive heat dissipation is reduced, so that the rate of heat conduction from the battery module 2 to the functional module 3 is reduced, thereby blocking the path for the heat of the battery module 2 to be transferred to the bottom plate 1 of the battery box through the functional module 3 for heat dissipation, thereby achieving the purpose of reducing the heat exchange of the battery module 2, enhancing the thermal insulation effect of the battery box, and improving the thermal insulation performance of the battery box.

[0057] In order to ensure that the first insulating sealed cavity 100 can isolate the heat transfer of the adjacent battery module 2, the first insulating sealed cavity 100 needs to have a certain volume. In this embodiment, the volume of the first insulating sealed cavity 100 accounts for more than one third of the total volume of the module body 31.

[0058] In this embodiment, the insulation board 35 is fixed on the step 321 by bonding. In this way, the bonding method is simple to operate, and the sealing between the insulation board 35 and the groove 32 is enhanced, and the sealing of the first insulation sealing cavity 100 is further ensured.

[0059] In this embodiment, the side of the insulation board 35 facing the first insulation sealed cavity 100 and the side away from the first insulation sealed cavity 100 can both be planes, which can ensure the insulation effect of the insulation sealed cavity on the one hand and the reliability of bonding on the other hand.

[0060] In this embodiment, the heat insulation board 35 is a hard heat insulation board. Specifically, the heat insulation board 35 can be a PET board. The PET board has high mechanical strength, rigidity and hardness, good electrical insulation and low thermal conductivity, which can effectively ensure the heat insulation effect and the reliability of the structure of the battery box. In other embodiments, the heat insulation board 35 can be a vacuum insulation board, or a board made of other heat insulation materials that can be used for batteries.

[0061] In order to improve the structural strength of the module body 31, a plurality of support beams 33 are arranged between the groove walls of the groove 32 corresponding to the two side surfaces of the module body 31 for cooperating with the adjacent battery modules 2 on both sides. Specifically, a plurality of support beams 33 are arranged between the relative groove walls of the groove 32 in the length direction, and the plurality of support beams 33 are evenly and spaced apart. The support beams 33 form a structural support for the module body 31 to increase the structural strength of the module body 31, thereby avoiding breaking or fracturing the module body 31 of the functional module 3 when the battery expands at the end of its life, thereby avoiding damaging the sealing structure of the module body 31.

[0062] In this embodiment, the support beam 33 is integrally formed with the module body 31 of the functional module 3, and the surface of the support beam 33 facing the bottom plate 1 of the battery box is flush with the end surface of the groove 32. In other embodiments, the surface of the support beam 33 facing the bottom plate 1 of the battery box is lower than the heat insulation board 35 and is located in the middle of the groove wall of the groove 32 to support the module body 31.

[0063] As an implementation mode, in this embodiment, continuous steps 321 are provided on the support beam 33 and the groove wall of the groove 32, and three support beams 33 are provided, so that the groove 32 forms a groove with four notches but is internally connected. Correspondingly, the heat insulation board 35 has four steps 321 respectively fixedly provided in the four notches, and the heat insulation board 35 is spaced apart from the support beam 33. In other embodiments, the support beam 33 can be provided directly below the heat insulation board 35, and plays a role in supporting the heat insulation board 35 while supporting the module body 31.

[0064] The notch of the groove 32 of the module body 31 is arranged toward the bottom plate 1 of the battery box, and there is a gap between the heat insulating plate 35 and the lower end surface of the module body 31. A seal 34 for sealing with the bottom plate 1 of the battery box is fixed on the lower end surface of the module body 31, so as to form a second heat insulating sealed cavity 200 between the heat insulating plate 35 and the bottom plate 1. Specifically, the depth of the step 321 on the groove 32 is greater than the thickness of the heat insulating plate 35, that is, there is a certain distance between the side of the bottom plate 1 of the battery box close to the first heat insulating sealed cavity 100 and the side of the heat insulating plate 35 away from the first heat insulating sealed cavity 100; a seal 34 is arranged between the end surface of the module body 31 having the groove 32 and the bottom plate 1 of the battery box, so that a second heat insulating sealed cavity 200 is formed between the heat insulating plate 35 and the bottom plate 1; the first heat insulating sealed cavity 100 and the second heat insulating sealed cavity 200 are located on both sides of the heat insulating plate 35.

[0065] By forming a double-layer air insulation sealing structure including a second insulation sealing cavity 200, an insulation board 35 and a first insulation sealing cavity 100 in the module body 31, the air sealed in the first insulation sealing cavity 100 and the second insulation sealing cavity 200 is not ventilated, thereby eliminating air convection and conduction heat dissipation, and reducing the rate of heat conduction from the battery module 2 to the functional module 3, thereby blocking the path for the heat of the battery module 2 to be transferred to the bottom plate 1 of the battery box through the functional module 3 for heat dissipation, thereby achieving the purpose of reducing the heat exchange of the battery module, enhancing the insulation effect of the battery box, and further improving the insulation performance of the battery box.

[0066] In this embodiment, the seal 34 is in a frame shape. Specifically, the width of the seal 34 in the frame shape is less than the wall thickness of the groove 32, and the inner edge of the seal 34 is aligned with the groove wall of the groove 32. During assembly, the two sides of the seal 34 are bonded to the end face of the groove 32 and the bottom plate 1 of the battery box respectively by gluing. In this way, the functional module 3 is bonded and initially fixed to the bottom plate 1 through the seal 34. Due to the size difference between the width of the seal 34 and the wall thickness of the groove 32, a certain gap 341 is formed between the outer periphery of the seal 34 and the functional module 3 and the bottom plate 1. Thermal conductive glue is applied along the gap 341, and after the battery modules 2 on both sides of the functional module 3 are loaded into the battery box, the glue overflow is squeezed to further fill the gap 341, thereby improving the sealing and fixing firmness of the functional module 3 and the bottom plate 1 of the battery box. In other embodiments, the seal 34 can be plate-shaped, so as to completely seal the notch of the groove 32.

[0067] In this embodiment, the sealing member 34 is made of foam material. Specifically, the foam may be silicone foam, CR foam or other foams with flame retardancy, sealing and elasticity.

[0068] A flame-retardant support 4 is arranged between the functional module 3 and the battery modules 2 on both sides. Heating films (not shown in the figure) for heating the battery module 2 are arranged on both sides of the flame-retardant support 4. Specifically, heating films for heating the battery module 2 are arranged on both sides in the width direction of the battery module 2. The flame-retardant support 4 forms lateral support for the heating film to prevent the heating film from loosening due to the expansion force during use, thereby causing a dry burning safety risk; when the ambient temperature is low, when the heating films of the battery modules 2 on both sides start to heat, the functional module 3 and the air inside the functional module 3 can be heated by heat conduction at the same time, so that the temperature of the functional module 3 reaches or is close to the temperature of the battery modules 2 on both sides.

[0069] In this embodiment, the flame retardant support member 4 is made of a composite material with high flame retardancy and certain thermal conductivity. Specifically, the composite material is a known technology in the art.

[0070] In this embodiment, after the functional module 3 and the battery modules 2 on both sides are completely put into the box, the flame retardant support member 4 is inserted into the gap between the battery module 2 and the functional module 3 .

[0071] In order to improve the reliable fixation of the heating film harness of the battery modules 2 on both sides, in the present embodiment, a harness fixing slot 36 for fixing the heating film harness is provided on the end wall at the top of the module body 31. In this way, the heating film harness can be fixed through the harness fixing slot 36, thereby avoiding the risk of the harness shaking without support and causing the wire outlet to tear, arc and ignite.

[0072] In order to improve the reliable fixation of the conductive bar of the battery module 2 on both sides of the functional module 3, in the present embodiment, an aluminum bar fixing slot 37 is provided at one end of the top of the module body 31 of the functional module 3, and the conductive bar across the module is interference fit with the aluminum bar fixing slot 37 to support the aluminum bar, thereby avoiding the risk of long-term shaking and arcing caused by the conductive bar without support; compared with the traditional use of metal / non-metallic fixed brackets, the process costs of welding the fixed brackets and the module body and bonding and positioning are omitted.

[0073] In order to improve the fireproof ability of the battery box, in the present embodiment, fireproof coatings are respectively provided on the two side surfaces of the module body 31 for cooperating with the adjacent battery modules 2 on both sides. Specifically, the outer surface of the two side surfaces of the module body 31 for cooperating with the adjacent battery modules 2 on both sides has a larger available area. The outer surface of the module body 31 is sprayed with a suitable area and thickness of high-temperature resistant fireproof and thermal insulation coating as required to achieve fireproof and thermal insulation of the functional module 3. When the battery modules 2 on both sides of the functional module 3 experience thermal runaway, the high-temperature resistant fireproof and thermal insulation coating sprayed on the surface of the functional module 3 can effectively isolate the heat diffusion of the battery modules 2 on both sides and control the direction of the fire, thereby delaying the time of heat spread.

[0074] In this embodiment, the high temperature resistant fireproof thermal insulation coating can be any one of the expansion type and solvent-free type coatings. The high temperature resistant fireproof thermal insulation coating is a known technology in the art and will not be described in detail here.

[0075] In this embodiment, the module body 31 of the functional module 3 is formed by a mold using EPP material, wherein EPP is a closed-cell foam material with excellent shock-absorbing and energy-absorbing properties and heat insulation, a high recovery rate after deformation, environmental protection, non-toxic and odorless, and good heat resistance, chemical corrosion resistance and oil resistance.

[0076] Embodiment 2 of the battery box of the present invention:

[0077] In the first embodiment of the battery box, a fixing slot for supporting the conductive bar of the battery module and fixing the wiring harness is provided on the top of the functional module. In this embodiment, the fixing slot is no longer provided on the functional module, but an additional fixing bracket is provided to support the conductive bar and fix the wiring harness.

[0078] Embodiment 3 of the battery box of the present invention:

[0079] In the embodiment 1 of the battery box, the two sides of the module body used to cooperate with the adjacent battery modules are respectively provided with fireproof coatings. In this embodiment, no fireproof coating is provided, but fireproof felt is provided on the two sides of the module body used to cooperate with the adjacent battery modules. Specifically, the fireproof felt can be mica board, ultra-fine glass wool, high-silica wool; in other embodiments, the outer surface of the module body is provided with fireproof coating, or the module body may not be provided with fireproof coating.

[0080] Embodiment 4 of the battery box of the present invention:

[0081] In the embodiment 1 of the battery box, three support beams are arranged between the groove walls of the grooves corresponding to the two side surfaces of the module body for cooperating with the adjacent battery modules on both sides. In this embodiment, the support beams can be arranged to be one, two, four or other suitable numbers to ensure the strength of the module body; in other embodiments, the support beams may not be arranged.

[0082] Embodiment 5 of the battery box of the present invention:

[0083] In the embodiment 1 of the battery box, continuous steps are provided on the support beam and the groove wall of the groove, and the heat insulation board is attached to the steps. In this embodiment, the support beam may not be provided with steps, the heat insulation board is only attached to the steps of the groove, and the support beam is only used to support the module body.

[0084] Embodiment 6 of the battery box of the present invention:

[0085] In the embodiment 1 of the battery box, a step is provided in the groove, and the heat insulation board is attached to the step. In this embodiment, the heat insulation board can be fixed to the step by welding or screwing.

[0086] Embodiment 7 of the battery box of the present invention:

[0087] In the embodiment 1 of the battery box, a step is provided in the groove. In this embodiment, no step is provided in the groove, but the heat insulation board is directly fixed on the support beam, and the heat insulation board and the groove wall of the groove are sealed by a sealant; accordingly, the setting of the support beam needs to be adaptively adjusted. In other embodiments, a boss protruding toward the center of the groove can be provided on the groove wall of the groove, and the heat insulation board is provided on the boss; or, the heat insulation board is directly provided at the notch of the groove.

[0088] Embodiment 8 of the battery box of the present invention:

[0089] In the first embodiment of the battery box, the width of the sealing member is smaller than the wall thickness of the groove. In this embodiment, the width of the sealing member is the same as the wall thickness of the groove.

[0090] Embodiment 9 of the battery box of the present invention:

[0091] In the first embodiment of the battery box, the inner edge of the seal is aligned with the groove wall of the groove. In this embodiment, the outer edge of the seal is aligned with the groove wall of the groove; or, the seal is located in the middle of the wall thickness of the groove.

[0092] Embodiment 10 of the battery box of the present invention:

[0093] In the first embodiment of the battery box, the notch of the groove is arranged downward. In this embodiment, the notch of the groove is arranged upward, specifically, the notch of the groove is arranged away from the bottom plate of the battery box, and accordingly, the notch of the groove needs to be provided with a cover to seal the notch of the groove, and there is no need to provide a sealing member between the module body and the bottom plate of the battery box.

[0094] Embodiment 11 of the battery box of the present invention:

[0095] In the embodiment 1 of the battery box, there is a second heat-insulating sealed cavity between the heat-insulating plate and the bottom plate. In this embodiment, the second heat-insulating sealed cavity is no longer provided, specifically, the heat-insulating plate is no longer provided to separate the groove, or the heat-insulating plate is provided at the notch of the groove.

[0096] Embodiment 12 of the battery box of the present invention:

[0097] In the embodiment 1 of the battery box, a heat insulation board is fixed on the groove wall of the groove, and the heat insulation board and the groove together form the first heat insulation sealed cavity. In this embodiment, the heat insulation board is no longer provided, but the first heat insulation sealed cavity is formed by the groove and the bottom plate of the battery box.

[0098] Embodiments of the functional modules of the present invention:

[0099] The functional modules in the present invention have the same structure as the functional modules in the above-mentioned battery box embodiment, and will not be described in detail here.

[0100] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. The patent protection scope of the present invention shall be based on the claims. All equivalent structural changes made using the contents of the description and drawings of the present invention should also be included in the protection scope of the present invention.

Claims

1. A functional module, characterized in that: It comprises a module body with a first heat-insulating sealed cavity inside, the volume of the first heat-insulating sealed cavity accounts for more than one third of the total volume of the module body, and air is sealed in the first heat-insulating sealed cavity to reduce heat conduction of adjacent battery modules.

2. The functional module according to claim 1, characterized in that: The module body is provided with a groove, a heat insulation board is fixed on the groove wall of the groove, and the heat insulation board and the groove together enclose the first heat insulation sealing cavity.

3. The functional module according to claim 2, characterized in that: The notch of the groove is arranged downward, and there is a gap between the insulation board and the lower end surface of the module body. A sealing member for sealing with the bottom plate of the battery box is fixed on the lower end surface of the module body to form a second insulation sealing cavity between the insulation board and the bottom plate.

4. The functional module according to claim 3, characterized in that: The width of the sealing member is smaller than the wall thickness of the groove, and the inner edge of the sealing member is aligned with the groove wall of the groove.

5. The functional module according to any one of claims 2 to 4, characterized in that: A step is arranged in the groove, and the heat insulation board is pasted on the step.

6. The functional module according to any one of claims 2 to 4, characterized in that: At least one supporting beam is arranged between the groove walls corresponding to the two side surfaces of the module body for cooperating with the adjacent battery modules on both sides, and continuous steps are arranged on the supporting beam and the groove walls, and the heat insulation board is pasted on the steps.

7. The functional module according to any one of claims 1 to 4, characterized in that: At least one supporting beam is arranged between the groove walls of the grooves corresponding to the two side surfaces of the module body for cooperating with the battery modules on the adjacent two sides.

8. The functional module according to any one of claims 1 to 4, characterized in that: The two side surfaces of the module body for cooperating with the adjacent battery modules are respectively provided with fireproof coatings.

9. The functional module according to any one of claims 1 to 4, characterized in that: The top of the functional module is provided with a fixing slot for supporting the conductive bar of the battery module and for fixing the wiring harness.

10. A battery box, comprising a bottom plate and a battery module and a functional module arranged on the bottom plate, characterized in that: The functional module is the functional module described in any one of claims 1 to 9.

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