Battery box, battery pack and vehicle

Abstract

The utility model belongs to vehicle technical field discloses a kind of battery box, battery pack and vehicle, the battery box in it, setting outer box and the inner box for accommodating electric core group, inner direction box is placed in outer box, flow channel is formed between the box bottom plate of outer box and the box bottom plate of inner box, without separately setting the plate forming flow channel, simplify the structure of battery box, reduce the occupied space of battery box.The battery pack provided by the utility model includes the battery box described above, by simplifying the structure of battery box, reduce the occupied space of battery pack, improve the integration of battery pack.The vehicle provided by the utility model includes the battery box described above or the battery pack described above, reduce the space occupation of battery pack on vehicle.

Description

Technical Field

[0001] This utility model relates to the field of vehicle technology, and in particular to a battery box, battery pack and vehicle. Background Technology

[0002] The battery box consists of a box body with an opening at one end and a box cover. The box body and the box cover are connected, and the box cover seals the opening of the box body. The battery cells are placed in the battery box body. To meet the cooling requirements of the battery cells, a flow channel plate is generally welded to the box cover or the bottom plate of the box body to form a liquid cooling flow channel for the circulation of coolant. Coolant is introduced into the liquid cooling flow channel to cool the battery cells inside the box body.

[0003] The aforementioned battery box has a complex structure, requiring the separate fabrication of flow channel plates, which are then welded to the box cover or bottom plate to form a liquid cooling plate. This occupies a large space and, to some extent, hinders the improvement of battery pack integration. Utility Model Content

[0004] The purpose of this utility model is to provide a battery box, battery pack, and vehicle to solve the problem that the complex structure of the battery box and the large amount of installation space it occupies hinder the improvement of the integration of the battery pack.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] Battery box, including:

[0007] The enclosure consists of an outer enclosure and an inner enclosure for housing the battery cells. The inner enclosure is located inside the outer enclosure. Each enclosure includes a bottom plate, and a flow channel is formed between the bottom plates of the two enclosures.

[0008] As one possible implementation of the above-mentioned battery box, at least one of the box bottom plates is provided with a groove, and the groove and the other box bottom plate form the flow channel.

[0009] As one possible implementation of the aforementioned battery box, the battery box further includes a connecting pipe, one end of which is confined between the two boxes and communicates with the flow channel, and the other end extends out of the outer box.

[0010] As one possible implementation of the aforementioned battery box, at least one of the inner box and the outer box is provided with a receiving groove, and the connecting pipe portion is housed within the receiving groove.

[0011] As one possible implementation of the aforementioned battery box, one end of the connecting pipe is confined between the two box bottom plates.

[0012] As one possible implementation of the above-mentioned battery box, the receiving tube groove includes a first receiving tube groove, at least one of the box bottom plates is provided with the first receiving tube groove on the side facing the other box bottom plate, and one end of the connecting tube is accommodated in the first receiving tube groove.

[0013] As one possible implementation of the aforementioned battery box, the connecting pipe is sealed to the bottom plates of both boxes.

[0014] As one possible implementation of the above-mentioned battery box, the connecting pipe is welded to the bottom plate of each of the boxes via a first welding member, so that an annular first sealing member is formed between the outer peripheral wall of the connecting pipe and the bottom plates of the two boxes.

[0015] As one possible implementation of the aforementioned battery box, the outer box body includes an outer box side panel connected to the box bottom plate, and the inner box body also includes an inner box side panel connected to the box bottom plate; a portion of the connecting pipe is confined between the outer box side panel and the inner box side panel.

[0016] As one possible implementation of the aforementioned battery box, at least one of the outer box side panel and the inner box side panel is provided with a second receiving groove, such that the connecting pipe is partially accommodated in the second receiving groove.

[0017] As one possible implementation of the aforementioned battery box, one end of the connecting pipe extends through the outer side panel of the outer casing.

[0018] As one possible implementation of the aforementioned battery box, the connecting pipe extends through the outer box side panel in a manner that seals against the outer box side panel.

[0019] As one possible implementation of the aforementioned battery box, the side plate of the outer casing is provided with a through-hole, and the connecting pipe is welded to the side plate of the outer casing through a second welding component, so that an annular second sealing component is formed between the inner peripheral wall of the through-hole and the outer peripheral wall of the connecting pipe.

[0020] As one possible implementation of the aforementioned battery box, the opening ends of both the inner box and the outer box are turned outward to form box flanges, and the box flanges of the two boxes are sealed together.

[0021] As one possible implementation of the aforementioned battery box, the included angle between the flange of the inner box and the inner side panel of the inner box is α; the included angle between the flange of the outer box and the outer side panel of the outer box is β; α > β.

[0022] As one possible implementation of the aforementioned battery box, both the inner box and the outer box are integrally stamped structural parts, with 90°<α≤120°.

[0023] As one possible implementation of the aforementioned battery box, 95°≤α≤110°.

[0024] As one possible implementation of the aforementioned battery box, the outer casing's flange and the outer casing's side panel are smoothly connected by a first rounded chamfer; the inner casing's flange and the inner casing's side panel are smoothly connected by a second rounded chamfer, the second rounded chamfer and the first rounded chamfer being spaced apart along a preset direction, the preset direction being perpendicular to the thickness direction of the bottom plate.

[0025] The present invention also provides a battery pack, including at least one cell assembly, and a battery case as provided in any of the above-described embodiments, wherein the cell assembly is disposed within the inner case and the cell assembly includes at least two cells.

[0026] This utility model also provides a vehicle, including the battery box provided by any of the above-described embodiments, or the battery pack provided by the above-described embodiments.

[0027] The beneficial effects of this utility model are:

[0028] The battery box provided by this utility model has an outer box and an inner box for accommodating battery cells. The inner box is placed inside the outer box, and the flow channel is formed between the bottom plate of the outer box and the bottom plate of the inner box. There is no need to set up a separate plate to form the flow channel, which simplifies the structure of the battery box and reduces the space occupied by the battery box.

[0029] The battery pack provided by this utility model includes the aforementioned battery box. By simplifying the structure of the battery box, the space occupied by the battery pack is reduced, and the integration of the battery pack is improved.

[0030] The vehicle provided by this utility model includes the aforementioned battery box or battery pack, reducing the space occupied by the battery pack in the vehicle. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the battery pack provided in an embodiment of the present invention;

[0032] Figure 2 This is a disassembled schematic diagram of the battery box of this utility model;

[0033] Figure 3 This is a top view of the battery pack before the inner and outer casings are brazed, as provided in this embodiment of the utility model.

[0034] Figure 4 yes Figure 3 Sectional view along line AA;

[0035] Figure 5 This is a first partial cross-sectional view of the battery pack provided in an embodiment of the present invention;

[0036] Figure 6 yes Figure 3 Sectional view along the BB direction;

[0037] Figure 7 This is a second partial cross-sectional view of the battery pack provided in this embodiment of the present invention;

[0038] Figure 8 A partial cross-sectional view of the battery pack before brazing of the inner and outer casings, provided in other embodiments of this utility model.

[0039] In the picture:

[0040] 1. Enclosure; 101. Inner enclosure; 1011. Inner enclosure bottom plate; 1012. Inner enclosure side plate; 102. Outer enclosure; 1021. Pipe mounting section; 1022. Outer enclosure bottom plate; 1023. Outer enclosure side plate; 10231. Pipe hole;

[0041] 11. Box bottom plate; 111. First receiving tube groove; 121. Second receiving tube groove; 13. Box flange; 14. Flow channel; 15. Cavity; 16. Gap;

[0042] 2. Connecting pipe; 21. First pipe section; 22. Second pipe section; 23. Third pipe section;

[0043] 31. First welded component; 32. Second welded component; 33. Third welded component; 34. Fourth welded component;

[0044] 100. Battery cells. Detailed Implementation

[0045] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0046] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0047] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0048] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0049] Embodiments of this utility model provide a battery box, a battery pack including the battery box, and a vehicle including the battery box or battery pack, thereby simplifying the structure of the battery box, reducing the space occupied by the battery box, and improving the integration of the battery pack. It should be noted that... Figures 1 to 8 In this context, the X direction refers to the length of the battery pack, the Y direction refers to the width of the battery pack, and the Z direction refers to the height of the battery pack. The X, Y, and Z directions are perpendicular to each other. The following text uses the Z direction (up and down) as an example. The battery cell can be a square cell, a cylindrical cell, or a blade cell, etc. The following text uses a square cell as an example. The connecting pipe is a coolant pipe, such as an inlet pipe and an outlet pipe. The flow channel is a cooling flow channel, and the medium flowing in the flow channel is coolant. Taking water as an example, the coolant can also be methanol or ethanol, etc. The connecting pipe can also be other types of pipes on the battery pack.

[0050] like Figures 1 to 5 As shown, the battery box includes two boxes 1, namely an outer box 102 and an inner box 101 for accommodating the battery cell assembly. The inner box 101 is located inside the outer box 102. Each box 1 includes a bottom plate 11, and a flow channel 14 is formed between the bottom plates 11 of the two boxes 1.

[0051] The battery box has an outer casing 102 and an inner casing 101 for accommodating the battery cells. The inner casing 101 is placed inside the outer casing 102. The flow channel 14 is formed between the bottom plate 11 of the outer casing 102 and the bottom plate 11 of the inner casing 101. There is no need to set up a separate plate to form the flow channel 14, which simplifies the structure of the battery box and reduces the space occupied by the battery box.

[0052] The battery pack provided in this embodiment includes the aforementioned battery box, which improves the integration of the battery pack by reducing the space occupied by the battery box.

[0053] The vehicle provided in this embodiment of the utility model includes the battery box or battery pack described above. By using the battery box described above, the space occupied by the battery pack in the vehicle is reduced.

[0054] In some embodiments, such as Figures 2 to 4 As shown, at least one bottom plate 11 of the box is provided with a groove, and the groove and another bottom plate 11 form a flow channel 14.

[0055] For ease of description, the bottom plate 11 of the outer box 102 is referred to as the outer box bottom plate 1022, and the bottom plate 11 of the inner box 101 is referred to as the inner box bottom plate 1011.

[0056] For example, a groove is formed on the side of the outer casing bottom plate 1022 facing the inner casing bottom plate 1011. The opening of the groove facing the inner casing bottom plate 1011 is blocked by the inner casing bottom plate 1011 to form the aforementioned flow channel 14. The flow channel 14 is a U-shaped flow channel, which extends the flow path of the coolant and improves the cooling effect of the battery cell assembly. It should be noted that the flow channel 14 can also be a serpentine flow channel, etc. For the cooling of the battery cell assembly, a partition can also be provided on the casing bottom plate 11 of the inner casing 101. A cooling channel communicating with the flow channel 14 is provided inside the partition. The partition is set between two adjacent battery cells 100, which can cool the bottom of the battery cell 100 while cooling the side of the battery cell 100. As an alternative, a groove can also be formed on the side of the inner casing bottom plate 1011 facing the outer casing bottom plate 1022, and the opening of the groove facing the outer casing bottom plate 1022 is blocked by the outer casing bottom plate 1022 to form the aforementioned flow channel 14.

[0057] In some embodiments, the bottom plates 11 of the two boxes 1 are sealed and fixed by brazing, resulting in a strong connection and facilitating the brazing of the bottom plates 11 of the two boxes 1 to seal the inner box bottom plate 1011 and the outer box bottom plate 1022, thereby forming a flow channel 14. Specifically, a brazing layer of aluminum alloy is sprayed onto the lower surface of the inner box bottom plate 1011 or the upper surface of the outer box bottom plate 1022. The melting point of the material forming the brazing layer is lower than that of the materials used to prepare the inner box 101 and the outer box 102. For example, the material forming the brazing layer is 4043 aluminum alloy or 4004 aluminum alloy, while the material used to prepare the inner box 101 and the outer box 102 is 3003 aluminum. When the inner box 101 and the outer box 102 are placed in a brazing furnace, the brazing layer melts before the inner box 101 and the outer box 102, thus achieving the brazing of the inner box bottom plate 1011 and the outer box bottom plate 1022.

[0058] In some embodiments, the battery box further includes a connecting pipe 2, one end of which is confined between the two boxes 1 and communicates with the flow channel 14, and the other end extends out of the outer box 102.

[0059] In this battery box, one end of the connecting pipe 2 extends between the outer box 102 and the inner box 101, and this end of the connecting pipe 2 is confined between the outer box 102 and the inner box 101 and connected to the flow channel 14. By using the inner box 101 and the outer box 102 to limit the connecting pipe 2, it is not necessary to open a hole for the connecting pipe 2 on the bottom plate 11 of the two boxes 1 to connect the flow channel 14 and the connecting pipe 2. This eliminates the need for a water nozzle inside the battery box, simplifies the installation of the connecting pipe 2, makes full use of the space between the outer box 102 and the inner box 101 to install the connecting pipe 2, integrates the connecting pipe 2 into the battery box, reduces the space occupied by the connecting pipe 2 inside and outside the battery box, and improves the integration of the battery pack.

[0060] Specifically, there are two connecting pipes 2, one of which is an inlet pipe and the other is an outlet pipe. For example, the inlet and outlet pipes are located on the same side of the outer casing 102 in the X direction, and are spaced apart along the Y direction. The inlet pipe is connected to one end of the flow channel 14, and the outlet pipe is connected to the other end of the flow channel 14. It should be noted that the inlet and outlet pipes can also be located on opposite sides of the outer casing 102, depending on actual needs, and are not specifically limited here.

[0061] Both the inner casing 101 and the outer casing 102 are basin-shaped, forming a chamber with a certain depth. The chamber of the inner casing 101 is used to accommodate the battery cell assembly, while the bottom plate 11 of the outer casing 102 is used to support the battery cells 100. At least one battery cell assembly is provided, and each battery cell assembly includes at least two battery cells 100 distributed along the X direction. Exemplarily, the cross-section of the casing 1 is rectangular, and the cross-section of the casing 1 is perpendicular to the thickness direction of the bottom plate 11; the cross-sectional area of ​​the casing 1 gradually increases from the bottom plate 11 to the opening end of the casing 1. One battery cell assembly is arranged, and each battery cell assembly includes five battery cells 100 distributed along the X direction. In other words, the battery cells 100 are arranged in a column of five rows. It should be noted that, depending on the number and size of the battery cells 100, two, three, or more battery cell assemblies can also be arranged, with at least two battery cell assemblies distributed along the Y direction; in other words, the battery cells 100 can also be arranged in an array with other numbers of rows and columns.

[0062] In some embodiments, at least one of the outer housing 102 and the inner housing 101 is provided with a receiving groove, such that the connecting pipe 2 is partially received within the receiving groove. This arrangement can reduce the space occupied by the connecting pipe 2 between the inner wall of the outer housing 102 and the inner wall of the inner housing 101.

[0063] In some embodiments, one end of the connecting pipe 2 is confined between the bottom plates 11 of the two housings 1. Specifically, as... Figure 2 , Figure 4 and Figure 5 As shown, at least one bottom plate 11 of the battery box has a first receiving groove 111 on the side facing the other bottom plate 11. The first receiving groove 111 and the other bottom plate 11 form a first receiving cavity, and one end of the connecting pipe 2 is housed in the first receiving cavity. By forming the first receiving cavity by opening the first receiving groove 111 and housing one end of the connecting pipe 2 in the first receiving cavity, the space of the connecting pipe 2 in the height direction of the battery box can be utilized to arrange the connecting pipe 2, thereby further reducing the space occupied by the connecting pipe 2 in the battery box.

[0064] For example, each of the bottom plates 11 of the two boxes 1 is provided with a first receiving groove 111. The openings of the two first receiving grooves 111 are arranged opposite each other along the Z direction. The bottom plates 11 of the two boxes 1 are sealed together so that the two first receiving grooves 111 enclose each other to form a first receiving cavity. As an alternative, the first receiving groove 111 can be provided only on one of the bottom plates 11 of the box. In this case, in order to facilitate the sealing connection between the connecting pipe 2 and the bottom plates 11 of the two boxes 1, the bottom plate 11 without the first receiving groove 111 is in surface contact with the connecting pipe 2. Specifically, by squeezing the connecting pipe 2, the side of the connecting pipe 2 facing away from the first receiving groove 111 forms an installation plane. Alternatively, the first receiving groove 111 can be not provided on either bottom plate 11 of the two boxes 1. In this case, in order to facilitate the sealing between the connecting pipe 2 and the bottom plates 11 of the two boxes 1, the connecting pipe 2 is a flat pipe with two oppositely arranged installation planes, so that the two installation planes can be sealed and fixed to the bottom plates 11 of the two boxes 1 one by one by brazing.

[0065] Specifically, forming the aforementioned groove and the first containment groove 111 by stamping can also improve the structural strength of the box body 1.

[0066] In some embodiments, such as Figure 2 , Figures 4 to 6 As shown, the connecting pipe 2 is sealed to the bottom plate 11 of both boxes 1 to prevent coolant leakage at the connection point between the connecting pipe 2 and the flow channel 14.

[0067] For example, the connecting pipe 2 is welded to the bottom plate 11 of each box 1 via a first welding member 31, forming an annular first seal between the outer peripheral wall of the connecting pipe 2 and the bottom plates 11 of the two boxes 1. This not only seals the connecting pipe 2 to the bottom plates 11 of the two boxes 1, but also fixes the connecting pipe 2 to the bottom plates 11 of the two boxes 1, improving the connection stability between the connecting pipe 2 and the bottom plates 11 of the boxes 1 and preventing the connecting pipe 2 from shaking. As an alternative, a sealing ring can be fitted over the connecting pipe 2 and sandwiched between the connecting pipe 2 and the bottom plate 11 of the box 1.

[0068] Specifically, a first welding component 31 is fitted onto the outside of the connecting pipe 2. The melting point of the first welding component 31 is lower than the melting point of the materials used to prepare the inner box 101 and the outer box 102. One end of the first welding component 31 is sandwiched between the outer peripheral wall of the connecting pipe 2 and the inner wall of the first container cavity. The other end of the first welding component 31 is folded inward to form an annular inner flange. The inner flange presses against the end face of the connecting pipe 2 near the flow channel 14 to position the connecting pipe 2. After the connecting pipe 2 is confined between the bottom plates 11 of the two boxes 1, it is placed together in a brazing furnace. The first welding component 31 will melt before the inner box 101 and the outer box 102, so that the gap between the connecting pipe 2 and the inner wall of the two first container grooves 111 is filled by the first sealing component formed by the melting of the first welding component 31, thereby achieving a sealed and fixed connection between the connecting pipe 2 and the bottom plates 11 of the two boxes 1.

[0069] It should be noted that the connecting tube 2 placed in the first cavity can be a round tube or a flat tube. For example, the cross-section of the connecting tube 2 placed in the first cavity is racetrack-shaped or elliptical, etc., and the cross-section of the connecting tube 2 placed in the first cavity is perpendicular to the axis of the connecting tube 2.

[0070] As an alternative, the inward bevel can also be removed, such as... Figure 8 As shown, a ring-shaped third welding component 33 is used. First, the third welding component 33 is sleeved on one end of the connecting pipe 2 and the connecting channel 14. Then, the ring-shaped third welding component 33 is fixed to the outer peripheral wall of the connecting pipe 2 by spot welding. After that, the third welding component 33 is melted by brazing to form a first sealing component, which fixes and seals the connecting pipe 2 and the bottom plates 11 of the two boxes 1. This facilitates direct contact between the connecting pipe 2 and the bottom plates 11 of the two boxes 1, improving the positioning reliability.

[0071] In some embodiments, the outer casing 102 includes an outer casing side plate 1023 connected to the casing bottom plate 11, and one end of the connecting pipe 2 extends out of the outer casing side plate 1023. Specifically, as Figure 2 , Figure 4 and Figure 5As shown, the outer casing side plate 1023 is provided with a through hole 10231. The connecting pipe 2 passes through the through hole 10231 and exits the outer casing side plate 1023 so that the cooling medium can enter the flow channel 14 through the connecting pipe 2.

[0072] In some embodiments, the connecting pipe 2 extends through the outer casing side plate 1023 in a sealed manner. Specifically, the outer peripheral wall of the connecting pipe 2 and the inner peripheral wall of the through hole 10231 are sealed together. This arrangement isolates the cavity 15 between the outer casing 102 and the inner casing 101 from the outside air.

[0073] For example, the connecting pipe 2 is welded to the outer casing side plate 1023 via the second welding member 32, so that an annular second seal is formed between the inner peripheral wall of the through hole 10231 and the outer peripheral wall of the connecting pipe 2.

[0074] Specifically, the outer wall of the outer casing side plate 1023 is provided with a pipe mounting part 1021. One end of the pipe hole 10231 extends to the pipe mounting part 1021, and the other end penetrates to the inner wall of the outer casing side plate 1023. A second welding part 32 is sleeved on the outer periphery of the connecting pipe 2. The melting point of the second welding part 32 is lower than the melting point of the material used to make the outer casing 102. One end of the second welding part 32 is sandwiched between the outer peripheral wall of the connecting pipe 2 and the inner peripheral wall of the pipe hole 10231, and the other end is folded outward to form an outer flange. The outer flange presses against the end face of the pipe mounting part 1021, which serves to position the connecting pipe 2.

[0075] The connecting pipe 2 is placed inside the outer casing 102. One end of the connecting pipe 2 is then passed through the through-hole 10231. The second welding component 32 is then fitted onto the end of the connecting pipe 2 that protrudes from the outer casing 102. Next, one end of the second welding component 32 is pressed between the outer peripheral wall of the connecting pipe 2 and the inner peripheral wall of the through-hole 10231 until the outwardly flanged edge presses against the end face of the pipe mounting part 1021. The outer casing 102 and the connecting pipe 2 are placed in a brazing furnace. The second welding component 32 melts before the outer casing 102 and the connecting pipe 2, filling the gap between the connecting pipe 2 and the inner peripheral wall of the through-hole 10231 with the second sealing component formed by the molten second welding component 32. This achieves a sealed connection between the connecting pipe 2 and the outer casing side plate 1023. Since the outer casing side plate 1023 is generally thin, the pipe mounting part 1021 facilitates the brazing sealing and fixing of the outer casing side plate 1023 and the connecting pipe 2.

[0076] It should be noted that the inner diameter of the through hole 10231 is slightly smaller than the outer diameter of the first welded part 31, so that one end of the second welded part 32 is clamped between the outer peripheral wall of the connecting pipe 2 and the inner peripheral wall of the through hole 10231, which serves to initially fix the first welded part 31 and the connecting pipe 2, making it easier to fix the connecting pipe 2 to the outer box side plate 1023 by brazing later. For example, the pipe mounting part 1021 is integrally formed on the outer box 102, specifically formed by stamping and machining, or punching process, and the outer peripheral wall of the pipe mounting part 1021 is conical.

[0077] It should be noted that before welding, there is a gap 16 between the inner wall of the first container 111 opening and the outer peripheral wall of the connecting pipe 2. During the brazing process, the molten solder of the first weldment 31 will fill this gap 16 to separate the flow channel 14 and the cavity 15. When the cross-section of the connecting pipe 2 placed in the first container cavity is racetrack-shaped or elliptical, it is beneficial to reduce the gap 16 and thus improve the welding reliability.

[0078] As an alternative, such as Figure 8 As shown, the outer flange can also be eliminated, and a ring-shaped fourth welding part 34 can be used. First, the ring-shaped fourth welding part 34 is fixed to the connecting pipe 2 by spot welding, and then the fourth welding part 34 is melted by brazing to form the first sealing part, which fixes and seals the connecting pipe 2 and the outer box side plate 1023. This facilitates direct contact between the connecting pipe 2 and the outer box side plate 1023 and improves the positioning reliability.

[0079] In some embodiments, such as Figure 2 , Figure 4 and Figure 5 As shown, the inner box 101 includes an inner box side plate 1012 connected to the box bottom plate 11, and the connecting pipe 2 is partially confined between the outer box side plate 1023 and the inner box side plate 1012. The connecting pipe 2 is confined along the X direction by the outer box side plate 1023 and the inner box side plate 1012.

[0080] Specifically, the connecting pipe 2 includes a first pipe section 21, a second pipe section 22 and a third pipe section 23 connected in sequence. The first pipe section 21 is placed in the first accommodating cavity, the second pipe section 22 is confined between the outer box side plate 1023 and the inner box side plate 1012, and the third pipe section 23 passes through the through hole 10231 on the outer box side plate 1023 and exits the outer box body 102.

[0081] By confining the first tube section 21 between the bottom plates 11 of the two boxes 1, the connecting tube 2 is positioned in the Z direction. By setting the second tube section 22 and confining the second tube section 22 between the outer box side plate 1023 and the inner box side plate 1012, the connecting tube 2 is positioned in the X direction. Furthermore, by using the bottom wall of the first accommodating tube groove 111 to position the connecting tube 2 in the Y direction, the connecting tube 2 is positioned from three directions, which facilitates brazing in the brazing furnace.

[0082] Furthermore, along the thickness direction of the bottom plate 11, the first tube 21 is closer to the outer bottom plate 1022 than the third tube 23. This allows for a height difference between the third tube 23 and the outer bottom plate 1022, ensuring that the height of the connecting tube 2 meets the actual installation requirements when the battery box is applied to a vehicle. In other words, the connecting tube 2 has a roughly Z-shaped structure. As an alternative, when applying the battery box to other applications, provided that the installation height of the connecting tube 2 meets the requirements, the connecting tube 2 can also be a straight tube. For example, the connecting tube 2 can be passed through the through hole 10231 and directly extended between the outer side plate 1023 and the inner side plate 1012, thus eliminating the need for the second tube 22. It should be noted that the portion of the third tube 23 extending beyond the outer side plate 1023 can be designed according to the required connecting pipes, which will not be specifically described here.

[0083] As an alternative, one end of the flow channel 14 can be extended to the outer box side plate 1023 and the inner box side plate 1012. In this case, only one end of the connecting pipe 2 needs to be arranged between the outer box side plate 1023 and the inner box side plate 1012 to connect with the flow channel. There is no need to arrange part of the connecting pipe 2 between the bottom plates 11 of the two boxes 1.

[0084] In some embodiments, such as Figure 2 , Figure 4 and Figure 5 As shown, at least one of the outer box side panel 1023 and the inner box side panel 1012 is provided with a second receiving groove 121, such that a portion of the second tube 22 is received in the second receiving groove 121.

[0085] By setting the second duct slot 121, the space of the battery box along the X direction can be utilized, thereby further reducing the space occupied by the connecting pipe 2 in the battery box; and the inner box side plate 1012 and the outer box side plate 1023 can be used to limit the connecting pipe 2 along the X direction.

[0086] For example, both the inner side panel 1012 and the outer side panel 1023 are provided with second tube grooves 121. The second tube grooves 121 on the inner side panel 1012 and the second tube grooves 121 on the outer side panel 1023 are arranged with their openings facing each other, so that the second tube portion 22 can be limited by the inner walls of the two second tube grooves 121 along the X direction. As an alternative, the second tube groove 121 can also be provided in one of the inner side panel 1012 and the outer side panel 1023.

[0087] It should be noted that when the first containment slot 111 and the second containment slot 121 are provided simultaneously, the first containment slot 111 and the second containment slot 121 can be provided only on the inner casing 101, and the first containment slot 111 and the second containment slot 121 can be not provided on the outer casing 102, so as to reduce the space occupied outside the battery box; the first containment slot 111 and the second containment slot 121 can be provided only on the outer casing 102, and the first containment slot 111 and the second containment slot 121 can be not provided on the inner casing 101, so as to reduce the space occupied inside the battery box and make full use of the space for arranging the cell pack or other components.

[0088] It should be noted that there is a gap between the outer wall of the second tube section 22 and the inner wall of the cavity 15 to facilitate the assembly and positioning of the connecting pipe 2 before welding, thereby ensuring that the first welded part 31 is clamped between the bottom plate 11 of the inner box 101, the bottom plate 11 of the outer box 102 and the outer peripheral wall of the first tube section 21, and the second welded part 32 is clamped between the pipe mounting part 1021 and the third tube section 23.

[0089] Specifically, the second containment groove 121 is formed by stamping, thereby simultaneously improving the structural strength of the box body 1.

[0090] By providing a first receiving groove 111 on the bottom plate 11 of both boxes 1, and a second receiving groove 121 on the inner side plate 1012 and the outer side plate 1023, the first pipe portion 21 of the connecting pipe 2 is arranged between the bottom plates 11 of the two boxes 1, and the second pipe portion 22 is arranged between the inner side plate 1012 and the outer side plate 1023. This reduces the space occupied by the connecting pipe 2 inside and outside the battery box and improves the integration of the battery pack.

[0091] By designing the bottom plate 11, inner side plate 1012, and outer side plate 1023 of the two boxes 1 according to the shape of the connecting pipe 2, and sealing and fixing the two ends of the connecting pipe 2 by brazing, the cavity 15 between the inner box 101 and the outer box 102, the chamber outside the outer box 102, and the flow channel 14 are isolated from each other, thereby improving the sealing reliability of the battery box.

[0092] By providing a first pipe groove 111 on the bottom plate 11 of both boxes 1, and a second pipe groove 121 on the inner side plate 1012 and the outer side plate 1023, the existing internal pipe connection structure of the battery box can be omitted, thereby improving the integration of the battery box.

[0093] In some embodiments, Figure 4 , Figure 6 and Figure 7 As shown, in the inner box 101 and the outer box 102, the opening end of each box 1 is turned outward to form a box flange 13. The box flanges 13 of the two boxes 1 are sealed together to prevent external air from entering the cavity 15 between the outer box 102 and the inner box 101 through the gap between the two box flanges 13.

[0094] Specifically, the box flange 13 has a ring-shaped structure. By sealing the two box flanges 13 together, external air cannot enter the cavity 15 through the opening ends of the inner box 101 and the outer box 102. As an alternative, the box flange 13 can also be non-ring-shaped. In this case, while sealing the two box flanges 13 together, a seal is provided between the inner box side panel 1012 and the outer box side panel 1023 to prevent external air from entering the cavity 15 through the opening ends of the inner box 101 and the outer box 102.

[0095] In some embodiments, the flanges 13 of the two housings 1 are connected by brazing. Specifically, a brazing layer is provided on the side of one flange 13 facing the other flange 13, and the melting point of the material forming the brazing layer is lower than the melting point of the materials used to prepare the inner housing 101 and the outer housing 102. Exemplarily, a brazing layer is provided on the lower surface of the flange 13 of the inner housing 101. Alternatively, a brazing layer can also be provided on the upper surface of the flange 13 of the outer housing 102; or a brazing layer can be provided on both the lower and upper surfaces of the flange 13 of the inner housing 101 and the outer housing 102.

[0096] After the inner casing 101 is placed inside the outer casing 102, the casing flange 13 with the brazed layer and another casing flange 13 are pressed together. Then, it is placed in a brazing furnace, where the brazed layer will melt to form a ring-shaped third seal, which fixes the two casing flanges 13 and seals them. It should be noted that the battery box also includes a top cover. The casing flange 13 of the inner casing 101 can also be used to connect to the top cover, such as by gluing the casing flange 13 of the inner casing 101 to the top cover with adhesive, welding the casing flange 13 of the inner casing 101 to the top cover, or connecting the casing flange 13 of the inner casing 101, the casing flange 13 of the outer casing 102, and the top cover with fasteners.

[0097] As an alternative, the two box flanges 13 can also be connected by multiple fasteners arranged circumferentially, and a third seal can be sandwiched between the two box flanges 13; the two box flanges 13 can also be connected by adhesive sealing, such as by using sealant to stick and fix the two box flanges 13.

[0098] For example, the box flange 13 is parallel to the box bottom plate 11.

[0099] In some embodiments, Figure 4 , Figure 6 and Figure 7 As shown, the inner box side panel 1012 and the outer box side panel 1023 are spaced apart. Specifically, in the inner box 101, the included angle between the box flange 13 and the outer box side panel 1023 is α; in the outer box 102, the included angle between the box flange 13 and the inner box side panel 1012 is β; α > β.

[0100] By limiting α to β, the inner box side panel 1012 and the outer box side panel 1023 do not contact each other, thus forming a cavity 15 between them. The inner box 101 and the outer box 102 only have contact between their two box flanges 13 and their bottom plates 11. This facilitates the contact between the two box flanges 13 and the bottom plates 11 of the two boxes 1 where the brazing layer is installed, reducing the processing accuracy requirements and improving process reliability. Furthermore, it is beneficial to space the inner box side panel 1012 and the outer box side panel 1023 to confine the second tube 22 within the cavity 15 between them.

[0101] In some embodiments, the inner box 101 and the outer box 102 are both integrally stamped structural parts, and the inner box 101 and the outer box 102 are easy to process and have low cost.

[0102] In some embodiments, Figure 4 , Figure 6 and Figure 7 As shown, 90° < α ≤ 120°. When α is less than 90°, it is impossible to form the inner box 101 and the outer box 102 by stamping; when α is equal to 90°, stamping is not conducive to demolding; when α is greater than 120°, the cross-section of the formed inner box 101 in the XZ plane will be a trapezoid with a wider top and a narrower bottom, which is conducive to demolding, but the bottom plate 11 of the inner box 101 is too small and cannot meet the area requirements for the bottom plate 11 of the inner box 101 to support the battery cell 100. By limiting 90° < α ≤ 120°, it is possible to form the inner box 101 and the outer box 102 by stamping under the premise that α > β, and make the inner box 101 have a larger bottom plate 11 to increase the effective space for loading the battery cell 100, and also make the inner box side plate 1012 and the outer box side plate 1023 spaced apart.

[0103] For example, 95°≤α≤110°. When α is greater than 90° and less than 95°, the stamping thinning rate will be too small, failing to meet the structural strength requirements of the housing 1; when α is greater than 110°, the area of ​​the bottom plate 11 of the inner housing 101 used to support the battery cell 100 is too small, which is not conducive to the arrangement of more battery cells 100. Multiple repeated tests were conducted within the range of 90°<α≤120°, and it was found that within the range of 95°≤α≤110°, not only can the stamping thinning rate be guaranteed not to be too small, so that the structural strength of the inner housing 101 and the outer housing 102 meets the requirements, but the area requirement of the bottom plate 11 of the inner housing 101 used to support the battery cell 100 can also be met. This achieves the goal of ensuring that the stamping thinning rate is not too low while allowing the inner housing 101 to have a larger bottom plate 11. It should be noted that α can be any value within the range of 95° or greater and 110° or less, such as α can be any value among 95°, 96°, 97°, 98°, 99°, 100°, 101°, 102°, 103°, 104°, 105°, 106°, 107°, 108°, 109°, and 110°.

[0104] The stamping thinning rate refers to the degree to which the thickness of a metal material decreases under tension and compression during the stamping process.

[0105] In other embodiments, Figure 4 , Figure 6 and Figure 7 As shown, the outer box 102's box flange 13 and outer box side panel 1023 are smoothly connected by a first rounded chamfer; the inner box 101's box flange 13 and inner box side panel 1012 are smoothly connected by a second rounded chamfer. The second rounded chamfer and the first rounded chamfer are spaced apart along a preset direction, which is perpendicular to the thickness direction of the box bottom plate 11.

[0106] This configuration allows for the formation of a cavity 15 between the inner box side panel 1012 and the outer box side panel 1023, provided that α ≤ β. This facilitates the fitting of the two box flanges 13 for subsequent brazing and fixing, as well as the fitting of the bottom plates 11 of the two box bodies 1 for subsequent brazing and fixing. It should be noted that, provided α > β, the second chamfer and the first chamfer can also be spaced apart along a predetermined direction.

[0107] The manufacturing process of the aforementioned battery box is as follows:

[0108] The inner box 101 and outer box 102 are formed by stamping. A brazing layer is sprayed onto the surface of one box flange 13 facing the other box flange 13, and a brazing layer is sprayed onto the surface of one box bottom plate 11 facing the other box bottom plate 11. The connecting pipe 2 is placed inside the outer box 102, and one end of the connecting pipe 2 extends out of the outer box side plate 1023. Then, the first welded part 31 is sleeved on the outside of the connecting pipe 2, and the first welded part 31 is pushed until the inner flange of the first welded part 31 presses against it. The second welding piece 32 is then fitted onto the outside of the connecting pipe 2, and pushed so that one end of the second welding piece 32 is clamped between the inner peripheral wall of the through hole 10231 and the outer peripheral wall of the connecting pipe 2, until the outer flange of the second welding piece 32 presses against the end face of the pipe mounting part 1021; then the inner box 101 is placed inside the outer box 102 until the box flanges 13 of the two boxes 1 press against each other; then the above structure is placed in a brazing furnace for brazing.

[0109] It should be noted that in the embodiments of this utility model, the materials of each welding component used to achieve brazing are the same.

[0110] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A battery box, characterized in that, include: Two boxes (1) are an outer box (102) and an inner box (101) for accommodating the battery cell assembly. The inner box (101) is located inside the outer box (102). Each box (1) includes a bottom plate (11). A flow channel (14) is formed between the bottom plates (11) of the two boxes (1).

2. The battery box according to claim 1, characterized in that, At least one of the box bottom plates (11) is provided with a groove, which together with another box bottom plate (11) forms the flow channel (14).

3. The battery box according to claim 1 or 2, characterized in that, The battery box also includes a connecting pipe (2), one end of which is confined between the two boxes (1) and connected to the flow channel (14), and the other end extends out of the outer box (102).

4. The battery box according to claim 3, characterized in that, At least one of the inner box (101) and the outer box (102) is provided with a receiving groove, and the connecting pipe (2) is partially housed in the receiving groove.

5. The battery box according to claim 4, characterized in that, One end of the connecting pipe (2) is confined between the two bottom plates (11) of the box.

6. The battery box according to claim 5, characterized in that, The receiving trough includes a first receiving trough (111), and at least one of the box bottom plates (11) is provided with the first receiving trough (111) on the side facing the other box bottom plate (11), and one end of the connecting pipe (2) is housed in the first receiving trough (111).

7. The battery box according to claim 5, characterized in that, The connecting pipe (2) is sealed to the bottom plate (11) of the two boxes (1).

8. The battery box according to claim 7, characterized in that, The connecting pipe (2) is welded to the bottom plate (11) of each of the boxes (1) through the first welding part (31), so that an annular first sealing element is formed between the outer peripheral wall of the connecting pipe (2) and the bottom plates (11) of the two boxes (1).

9. The battery box according to claim 4, characterized in that, The outer casing (102) includes an outer casing side panel (1023) connected to the bottom plate (11), and the inner casing (101) also includes an inner casing side panel (1012) connected to the bottom plate (11). A portion of the connecting pipe (2) is confined between the outer casing side panel (1023) and the inner casing side panel (1012).

10. The battery box according to claim 9, characterized in that, The trough includes a second trough (121). At least one of the outer box side plate (1023) and the inner box side plate (1012) is provided with the second trough (121), such that the connecting pipe (2) is partially housed in the second trough (121).

11. The battery box according to claim 3, characterized in that, One end of the connecting pipe (2) extends through the outer side plate (1023) of the outer casing (102).

12. The battery box according to claim 11, characterized in that, The connecting pipe (2) extends out of the outer box side plate (1023) in a manner that seals against the outer box side plate (1023).

13. The battery box according to claim 12, characterized in that, The outer box side plate (1023) is provided with a through hole (10231). The connecting pipe (2) is welded to the outer box side plate (1023) through a second welding part (32), so that an annular second sealing part is formed between the inner peripheral wall of the through hole (10231) and the outer peripheral wall of the connecting pipe (2).

14. The battery box according to claim 1, characterized in that, The opening ends of the inner box (101) and the outer box (102) are both turned outward to form box flanges (13), and the two box flanges (13) are sealed together.

15. The battery box according to claim 14, characterized in that, The included angle between the box flange (13) of the inner box (101) and the inner box side panel (1012) of the inner box (101) is α; the included angle between the box flange (13) of the outer box (102) and the outer box side panel (1023) of the outer box (102) is β; α > β.

16. The battery box according to claim 15, characterized in that, Both the inner box (101) and the outer box (102) are integrally stamped structural parts, with 90° < α ≤ 120°.

17. The battery box according to claim 16, characterized in that, 95°≤α≤110°。 18. The battery box according to any one of claims 14 to 17, characterized in that, The outer box (102)'s box flange (13) and the outer box side panel (1023) of the outer box (102) are smoothly connected by a first rounded chamfer; the inner box (101)'s box flange (13) and the inner box side panel (1012) of the inner box (101) are smoothly connected by a second rounded chamfer, the second rounded chamfer and the first rounded chamfer are spaced apart along a preset direction, the preset direction being perpendicular to the thickness direction of the box bottom plate (11).

19. A battery pack, characterized in that, It includes at least one battery cell assembly and a battery case as described in any one of claims 1 to 18, wherein the battery cell assembly is disposed within the inner casing (101) and the battery cell assembly includes at least two battery cells (100).

20. A vehicle, characterized in that, Includes the battery box as described in any one of claims 1 to 18, or the battery pack as described in claim 19.

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