A battery box

Abstract

This invention relates to the field of energy storage technology, specifically to a battery box, comprising a box body and a cell module disposed within the inner cavity of the box body. The cell module includes a buffer element and multiple electrically connected cells. Each cell is arranged within the inner cavity of the box body along a first direction or a second direction, the first direction being perpendicular to the second direction. Each cell is provided with a buffer element to create a liquid flow channel between adjacent cells for the flow of insulating coolant. This invention provides an immersion-type cell-cooled battery box, which can prevent heat propagation from the cells.

Description

Technical Field

[0001] This invention relates to the field of energy storage technology, and more particularly to a battery box. Background Technology

[0002] With the rapid development of the new energy industry, new energy vehicles and lithium battery energy storage have been widely used. However, both the automotive and energy storage industries have increasingly higher requirements for battery pack range and charge / discharge rates. High-rate charging and discharging and harsh operating conditions generate a large amount of heat, potentially causing thermal runaway in the battery cells and leading to safety accidents. Currently, battery cell cooling methods are divided into air cooling and water cooling. Water cooling involves placing water-cooling components at the bottom of the battery pack to support and cool it. However, this method cannot completely eliminate the phenomenon of heat spread within the battery cells. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a battery box that can immerse the battery pack in an insulating coolant such as fluorinated liquid for cooling and prevent the thermal spread of the battery cells.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows: a battery box, including a box body and a cell module disposed in the inner cavity of the box body; the cell module includes a buffer and a plurality of electrically connected cells, each cell being arranged in the inner cavity of the box body along a first direction or a second direction, the first direction being perpendicular to the second direction, and each cell being provided with a buffer to form a liquid flow channel for insulating coolant to flow between adjacent cells.

[0005] The beneficial effects of this invention are as follows: An insulating coolant, such as a fluorinated liquid, is added to the inner cavity of the housing. Multiple battery cells are then electrically connected and immersed in the insulating coolant. Simultaneously, buffer components are installed on the battery cells to isolate each cell, forming a liquid flow channel. This allows the insulating coolant to circulate between each cell, ensuring cooling of each cell and preventing heat transfer from one cell to others. Furthermore, the buffer components also ensure the shock resistance of each cell. Attached Figure Description

[0006] Figure 1 This is a schematic diagram of the exploded structure of a battery box in a specific embodiment of the present invention;

[0007] Figure 2 This is a cross-sectional structural diagram of a battery box in a specific embodiment of the present invention, showing the battery cell module assembled inside the box.

[0008] Figure 3 This is a front view structural diagram of a battery box in a specific embodiment of the present invention;

[0009] Figure 4 This is a schematic diagram of the end plate of a battery box in a specific embodiment of the present invention;

[0010] Figure 5 for Figure 4 A cross-sectional view of a battery box along the AA direction;

[0011] Figure 6 for Figure 4 A cross-sectional view of a battery box along the BB direction;

[0012] Figure 7 This is a schematic diagram of the assembly structure of the BMS module of a battery box on a placement box in a specific embodiment of the present invention;

[0013] Figure 8 This is a schematic diagram of the structure of a BMS module for a battery box in a specific embodiment of the present invention;

[0014] Figure 9 This is a schematic diagram of the application state structure of a battery box buckle in a specific embodiment of the present invention;

[0015] Figure 10 This is a schematic diagram of the buckle structure of a battery box in a specific embodiment of the present invention;

[0016] Figure 11 This is a schematic diagram of the battery box structure in a specific embodiment of the present invention;

[0017] Figure 12 This is an exploded structural diagram of the insert and connecting plate of a battery box in a specific embodiment of the present invention;

[0018] Figure 13 This is a cross-sectional structural diagram of an insert for a battery box in a specific embodiment of the present invention;

[0019] Figure 14 This is a structural schematic diagram of a load-bearing base for a battery box in a specific embodiment of the present invention;

[0020] Label Explanation:

[0021] 1. Enclosure; 11. Connecting plate; 111. Locking hole; 1111. Protrusion; 112. Reinforcing rib; 12. Horizontal reinforcing rib; 13. Explosion-proof valve; 14. Mounting component; 141. Boss; 1411. Mounting hole;

[0022] 2. Battery cell module; 21. Buffer component; 211. First buffer pad; 212. Second buffer pad; 22. Battery cell;

[0023] 3. Fixing components; 31. End plate; 311. Limiting component; 312. Reinforcing rib; 313. Lifting process hole; 32. Steel strip; 321. Folded edge;

[0024] 4. Placement box; 41. First plate; 42. Second plate; 43. Third plate; 44. Fourth plate; 45. Limiting ribs; 46. Installation ribs;

[0025] 5. BMS module; 51. Fourth buffer pad; 52. Card interface;

[0026] 6. Buckle; 61. Mounting chamber; 62. First elastic element; 63. Second elastic element;

[0027] 7. Load-bearing base; 71. Fixing plate; 72. Reinforcing beam;

[0028] 8. Insert; 81. First through hole; 82. Second through hole; 83. Groove. Detailed Implementation

[0029] To explain in detail the technical content, objectives, and effects of the present invention, the following description is provided in conjunction with the embodiments and accompanying drawings.

[0030] With the rapid development of the new energy industry, new energy vehicles and lithium battery energy storage have been widely used. However, both the automotive and energy storage industries have increasingly higher requirements for battery pack range and charge / discharge rates. High-rate charging and discharging and harsh operating conditions generate a large amount of heat, potentially causing thermal runaway in the battery cells and leading to safety accidents. Currently, battery cell cooling methods are divided into air cooling and water cooling. Water cooling involves placing water-cooling components at the bottom of the battery pack to support and cool it. However, this method cannot completely eliminate the phenomenon of heat spread within the battery cells.

[0031] Based on this, this application provides a battery box that can solve the problem of thermal propagation of battery cells.

[0032] In this embodiment of the application, the length direction of the box 1 is taken as the first direction, and the width direction of the box 1 is taken as the second direction.

[0033] Please refer to Figure 1 and Figure 2As shown, the present invention discloses a battery box, comprising a box body 1 and a battery cell module 2 disposed within the inner cavity of the box body 1. The battery cell module 2 includes a buffer member 21 and multiple electrically connected battery cells 22. Each battery cell 22 is arranged in the inner cavity of the box body 1 along a first direction or a second direction, the first direction being perpendicular to the second direction. Each battery cell 22 is provided with a buffer member 21 to form a liquid flow channel for insulating coolant flow between adjacent battery cells 22. The box body is made of thermoplastic plastic or composite material, preferably PP or prepreg epoxy resin. This allows the box body 1 to be compatible with insulating coolants such as fluorinated liquids, and enables the battery pack to maintain thermal insulation performance and structural design flexibility in cold environments.

[0034] As can be seen from the above description, the beneficial effects of the present invention are as follows: An insulating coolant, such as fluorinated liquid, is added to the inner cavity of the housing 1. Multiple battery cells 22 are then electrically connected and immersed in the insulating coolant. Simultaneously, a buffer member 21 is provided on each battery cell 22 to isolate each cell 22, forming a liquid flow channel for the insulating coolant. This allows the insulating coolant to flow between each battery cell 22, ensuring not only the cooling of each cell 22 but also preventing heat transfer from one cell to other cells. Furthermore, the buffer member 21 also ensures the shock resistance of each battery cell 22.

[0035] In one alternative implementation, please refer to Figure 1 and Figure 9 As shown, a mounting component 14 is installed inside the housing 1 along the arrangement direction of the battery cells 22 within the housing 1. Multiple bosses 141 are provided on the top of the mounting component 14, and each boss 141 has a mounting hole 1411 for positioning and holding a nut. By providing the mounting hole 1411, the in-mold injection nut can be eliminated, reducing the occurrence of cracking during injection molding. During assembly, simply placing the nut into the mounting hole 1411 allows for the assembly of the aluminum bar that electrically connects to the battery cells 22. The gap between the inner wall of the mounting hole 1411 and the outer wall of the nut is 0.2-0.8 mm, preventing assembly failure due to processing errors.

[0036] In one alternative implementation, please refer to Figure 1 As shown, the body of the box 1 and the box cover are sealed by a sealing strip and bolt connection.

[0037] Please refer to Figure 1 and Figure 2As shown, the buffer 21 further includes a first buffer pad 211 and a second buffer pad 212; the first buffer pad 211 is disposed on the top surface of the battery cell 22, and the second buffer pad 212 is wrapped around the bottom of the battery cell 22. The first buffer pad 211 has a sheet-like structure covering the top surface of the battery cell 22, and the second buffer pad 212 has a U-shaped cross-section wrapping around the bottom of the battery cell 22; both the first buffer pad 211 and the second buffer pad 212 are constructed from a combination of cushioning foam and rigid insulating material. The material may be, for example, silicone rubber or MPP.

[0038] As described above, the first buffer pad 211 and the second buffer pad 212 create a liquid flow channel between adjacent battery cells 22, allowing the insulating coolant to circulate between each battery cell 22. This not only ensures the cooling of each battery cell 22 but also prevents heat from spreading from one battery cell to other cells. Furthermore, the cooperation of the first buffer pad 211 and the second buffer pad 212 also ensures the shock resistance of each battery cell 22.

[0039] Please refer to Figure 1 and Figure 3 As shown, the aforementioned battery box further includes a fixing component 3, which includes an end plate 31 and a steel strip 32. The end plates 31 are provided on the outer side walls of both ends of the box body 1 along the first direction, and the steel strip 32 connects to the end plates 31 located on the outer side walls of both ends of the box body 1 along the first direction. Preferably, the end plates 31 are made of materials such as aluminum alloy or magnesium alloy through a die-casting process.

[0040] As described above, in order to reduce the deformation of the entire battery box caused by the expansion force generated during the operation of the battery cell 22, end plates 31 are provided at both ends of the box body 1 and connected by steel strips 32. Furthermore, setting the fixing components 3 on the outside of the box body 1, compared to directly fixing the battery cell module 2 inside the box body 1, can improve the space utilization of the box body 1's internal cavity, thereby increasing the charge capacity of the battery cell 22 and reducing the amount of insulating coolant used.

[0041] Furthermore, the fixing component 3 also includes a third buffer pad (not shown in the figure), which is disposed between the end plate 31 and the housing 1. Preferably, the third buffer pad is made of MPP buffer material, and preferably, the third buffer pad is bonded between the end plate 31 and the housing 1 with double-sided adhesive.

[0042] As described above, the expansion force generated during the operation of cell 22 is first partially absorbed and resisted by the housing 1 and the third buffer pad, and then transferred to the fixing component 3, which can minimize the impact of the expansion force on the outer contour dimensions of the product.

[0043] Please refer to Figure 4As shown, further, a limiting member 311 is provided on the end face of the end plate 31 away from the housing 1, and the limiting member 311 forms an assembly space with the end plate 31; the steel strip 32 has flanges 321 at both ends along its length, and the flanges 321 are located within the assembly space and connected to the end plate 31. Preferably, the limiting member 311 is a limiting block protruding from the end plate 31, but to limit the steel strip 32, the limiting member 311 can also be considered as a notch forming the assembly space on the end plate 31.

[0044] As described above, the steel strip 32 is positioned within the assembly space formed by the limiting member 311 and the end plate 31, and then connected to the end plate 31 by the folded edge 321. This can prevent the other end of the steel strip 32 from lifting up and injuring people when one end of the steel strip 32 is locked.

[0045] Furthermore, a gap is left between the position of the steel strip 32 bent to form the folded edge 321 and the end plate 31. The radius (R) at the bend of the steel strip 32 and the folded edge 321 is preferably 10-15mm, and the gap between the end plate 31 at the bend is 1-4mm, preferably 2-3mm.

[0046] As can be seen from the above description, the gap between the position of the steel strip 32 bent to form the folded edge 321 and the end plate 31 can ensure that the expansion of the battery cell 22 in the later stage will not damage the housing 1, and ensure that the battery cell 22 will not have serious bulging and lithium plating.

[0047] In one alternative implementation, please refer to Figure 4 As shown, the end plate 31, located away from the housing 1, has multiple reinforcing ribs 312 and multiple lifting process holes 313. The reinforcing ribs 312 enhance the strength of the end plate 31, preventing the battery cell 22 from bulging. The lifting process holes 313 facilitate the transportation of the end plate 31 in the workshop. The reinforcing ribs 312 are sparser in the middle of the end plate 31's end face and denser at the top and bottom. This is because the bulging of the battery cell 22 mainly occurs in the middle area. When the battery cell 22 expands, the sparser reinforcing ribs 312 in the middle of the end plate 31 allow it to expand naturally, reducing stress concentration and preventing the housing 1 and end plate 31 from cracking.

[0048] In one alternative implementation, please refer to Figure 5 and Figure 6 As shown, the reinforcing rib 312 forms an angle C of 90° with the horizontal, and the end face of the end plate 31 away from the housing 1 forms an angle D of 91° with the horizontal.

[0049] In one alternative embodiment, the length of the end plate 31 is greater than the length of the side wall of the corresponding abutment box 1, so as to reserve the space required for locking the end plate 31 and the steel strip 32 using a torque tool.

[0050] Please refer to Figure 1 and Figure 7 As shown, further, a placement box 4 is connected to one of the outer side walls of the housing 1 along the first direction, and a BMS module 5 electrically connected to the battery cell 22 is placed in the inner cavity of the placement box 4.

[0051] As can be seen from the above description, a placement box 4 for placing the BMS module 5 is connected to one of the outer side walls of the housing 1 along the first direction, which can reduce the overall height of the battery box.

[0052] Please refer to Figure 7 As shown, further, the end face of the placement box 4 away from the box body 1 is stepped so that the internal space of the placement box 4 increases from bottom to top.

[0053] Please refer to Figure 7 As shown, further, the end of the placement box 4 away from the box body 1 includes a first plate 41, a second plate 42, a third plate 43 and a fourth plate 44 connected sequentially from top to bottom. The first plate 41 and the third plate 43 are inclined, and the second plate 42 and the fourth plate 44 are vertical.

[0054] As described above, tilting the first plate 41 maximizes the internal space at the top of the placement box 4, allowing the high and low voltage connectors of the BMS module 5 to be placed therein, and further reduces the overall height of the battery box. The second plate 42 is vertically positioned to facilitate the pasting of various labels. The tilted third plate 43 and the vertical fourth plate 44 are designed to restrict the bottom of the BMS module 5 to prevent it from moving.

[0055] Please refer to Figure 7 As shown, further, a limiting rib 45 is provided at the bottom of the inner cavity of the placement box 4.

[0056] As can be seen from the above description, the use of the limiting rib 45 can further improve the installation reliability of the BMS module 5 in the placement box 4.

[0057] Please refer to Figure 7 and Figure 8 As shown, furthermore, a fourth buffer pad 51 is provided on the bottom of the bracket of the BMS module 5, and the fourth buffer pad 51 abuts against the end face of the placement box 4 near the housing 1. The fourth buffer pad 51 is an L-shaped buffer foam.

[0058] As can be seen from the above description, the fourth buffer pad 51 can not only prevent the BMS module 5 from shaking up, down, left, and right in the placement box 4, but also provide buffer protection for the BMS module 5.

[0059] In one alternative embodiment, the end face of the placement box 4 near the box body 1 is tilted toward the end face of the placement box 4 away from the box body 1, in order to facilitate mold demolding after injection molding.

[0060] In one alternative embodiment, the length of the placement box 4 is less than the length of the corresponding side wall abutting the box body 1, which leaves enough space for the locking of the steel strip 32 and the end plate 31.

[0061] Please refer to Figure 7 and Figure 9 As shown, a battery box further includes a buckle 6. The top of the placement box 4 is provided with a mounting rib 46, and the buckle 6 is disposed on the mounting rib 46. The bracket of the BMS module 5 is provided with a card interface 52, and the buckle 6 passes through the card interface 52 and engages with the bracket of the BMS module 5.

[0062] As described above, a buckle 6 is provided on the mounting rib 46 of the placement box 4, and a card interface 52 that engages with the buckle 6 is provided on the bracket of the BMS module 5, so that the BMS module 5 can be fixed in the inner cavity of the placement box 4 by the buckle 6.

[0063] Please refer to Figure 9 and Figure 10 As shown, the buckle 6 further includes a mounting chamber 61 into which the mounting rib 46 extends. The buckle 6 is provided with a first elastic element 62 and a second elastic element 63. The first elastic element 62 is located within the mounting chamber 61 and extends upwards at a first free end. The second elastic element 63 is located outside the buckle 6 and extends downwards at a second free end. When the mounting rib 46 extends into the mounting chamber 61, the first free end of the first elastic element 62 abuts against the side wall of the mounting rib 46. When the buckle 6 passes through the card interface 52, the second free end of the second elastic element 63 abuts against the bracket of the BMS module 5. Preferably, the second elastic element 63 is an L-shaped elastic strip.

[0064] As described above, in order to reduce the difficulty of injection molding, a buckle 6 with an installation chamber 61 is specially provided. During the assembly of the buckle 6 onto the placement box 4, the installation rib 46 of the placement box 4 is inserted into the installation chamber 61 of the buckle 6. Since the installation chamber 61 of the buckle 6 has a first elastic element 62, the installation rib 46 will push the first elastic element 62 open during the process of extending into the installation chamber 61. The free end of the first elastic element 62 will always exert force on the installation rib 46 due to the elastic force, thereby reliably fixing the buckle 6 onto the placement box 4.

[0065] As the buckle 6 passes through the card interface 52 on the bracket of the BMS module 5, the bracket of the BMS module 5 will squeeze the second elastic member 63 to move towards the mounting chamber 61 until the second elastic member 63 has passed through the card interface 52. Then the second elastic member 63 will reset, thereby snapping the BMS module 5 into the placement box 4.

[0066] Please refer to Figure 1 , Figure 11 and Figure 12 As shown, the aforementioned battery box further includes a load-bearing base 7. A connecting plate 11 is provided on the outer side wall of the box body 1 along the second direction. The connecting plate 11 is provided with a plurality of locking holes 111. The connecting plate 11 is threadedly connected to the load-bearing base 7 by screws passing through the locking holes 111. The load-bearing base 7 can be connected to the end plate 31 to further enhance the overall strength of the battery box. The load-bearing base 7 is preferably made of aluminum alloy.

[0067] As described above, the battery box 1 is threadedly connected to the load-bearing base 7 by screws passing through the locking holes 111 of the connecting plate 11, thereby enhancing the overall strength of the battery box.

[0068] Please refer to Figure 12 and Figure 13 As shown, further, an insert 8 is embedded in the locking hole 111, a first through hole 81 is provided at the top of the insert 8, a second through hole 82 communicating with the first through hole 81 is provided at the bottom of the insert 8, a rivet nut is provided on the load-bearing base 7, and the rivet nut is located in the second through hole 82, and the connecting plate 11 is threadedly connected to the rivet nut located in the second through hole 82 by a screw passing through the first through hole 81.

[0069] As described above, an insert 8 is embedded in the locking hole 111, and the rivet nut on the load-bearing base 7 can extend into the second through hole 82 of the insert 8. During the connection between the housing 1 and the load-bearing base 7, a screw passes through the first through hole 81 of the insert 8 and is threadedly connected to the rivet nut located in the second through hole 82.

[0070] Please refer to Figure 12 and Figure 13As shown, further, a groove 83 is provided along the contour on the outer side wall of the insert 8, and a protrusion 1111 extending into the groove 83 is provided in the locking hole 111.

[0071] As can be seen from the above description, the engagement of the protrusion 1111 with the groove 83 can ensure the pull-out force of the insert 8 on the connecting plate 11, thereby ensuring that the box 1 and the load-bearing base 7 will not become loose during transportation or vibration.

[0072] Please refer to Figure 11 and Figure 12 As shown, further, a reinforcing rib 112 is provided on the surface of the connecting plate 11 and at one or both ends of the locking hole 111, and the reinforcing rib 112 extends to the outer wall of the housing 1 along the second direction.

[0073] Please refer to Figure 11 As shown, the outer side wall of the box body 1 along the second direction is provided with a transverse reinforcing rib 12, which intersects with the reinforcing rib 112.

[0074] As can be seen from the above description, the addition of reinforcing ribs 112 to the corresponding locking hole 111 and the provision of a small number of transverse reinforcing ribs 12 on the housing 1 not only ensures the strength of the connection between the housing 1 and the load-bearing base 7, but also avoids excessive strength of the housing 1, which would cause the housing 1 to deform naturally as the battery cell 22 expands, thus avoiding stress concentration that could cause the housing 1 to crack.

[0075] Please refer to Figure 14 As shown, a fixing plate 71 is provided on the load-bearing base 7, and the fixing plate 71 is connected to the bottom of the box body 1.

[0076] As can be seen from the above description, the connection between the load-bearing base 7 and the bottom of the box 1 through the fixing plate 71 can further enhance the connection between the load-bearing base 7 and the box 1.

[0077] In one alternative implementation, please refer to Figure 14 As shown, a reinforcing beam 72 is provided at the bottom of the load-bearing base 7. The reinforcing beam 72 enhances the strength of the load-bearing base 7 to reduce the influence of the housing 1 on the shape of the load-bearing base 7 as the battery cell 22 expands.

[0078] Please refer to Figure 1 As shown, an explosion-proof valve 13 is provided at the top of the box 1. The air inlet of the explosion-proof valve 13 is connected to the inner cavity of the box 1, and the air outlet of the explosion-proof valve 13 is connected to the external environment of the box 1.

[0079] As described above, when cell 22 experiences thermal runaway and vaporizes due to heat absorption by the insulating coolant, if the internal pressure of housing 1 becomes too high, the explosion-proof valve 13 will open to release pressure, preventing an explosion caused by excessive pressure inside housing 1. Simultaneously, the insulating coolant can be replenished by injecting it into the internal cavity of housing 1 through the explosion-proof valve 13.

[0080] Example 1

[0081] A type of battery box, please refer to Figure 1 and Figure 2 As shown, the device includes a housing 1 and a battery cell module 2 disposed within the inner cavity of the housing 1. The battery cell module 2 includes a buffer element 21 and multiple electrically connected battery cells 22. Each battery cell 22 is arranged in the inner cavity of the housing 1 along a first direction or a second direction, the first direction being perpendicular to the second direction. Each battery cell 22 is provided with a buffer element 21 to form a liquid flow channel between adjacent battery cells 22. The buffer element 21 includes a first buffer pad 211 and a second buffer pad 212; the first buffer pad 211 is disposed on the top surface of the battery cell 22, and the second buffer pad 212 is wrapped around the bottom of the battery cell 22. An explosion-proof valve 13 is provided at the top of the housing 1. The air inlet of the explosion-proof valve 13 is connected to the inner cavity of the housing 1, and the air outlet of the explosion-proof valve 13 is connected to the external environment of the housing 1.

[0082] Example 2

[0083] Based on Embodiment 1, this embodiment also includes a fixing component 3 for the battery box, as detailed below:

[0084] Please refer to Figure 1 and Figure 3 As shown, the fixing component 3 includes an end plate 31 and a steel strip 32; the end plates 31 are provided on the outer side walls of both ends of the housing 1 along the first direction, and the steel strip 32 connects to the end plates 31 located on the outer side walls of both ends of the housing 1 along the first direction. The fixing component 3 also includes a third buffer pad (not shown in the figure), which is disposed between the end plate 31 and the housing 1. A limiting member 311 is provided on the end face of the end plate 31 away from the housing 1, and the limiting member 311 and the end plate 31 form an assembly space; the steel strip 32 has flanges 321 at both ends along its length, and the flanges 321 are located within the assembly space and connected to the end plate 31. A gap is left between the position of the steel strip 32 bent to form the flanges 321 and the end plate 31.

[0085] Example 3

[0086] Based on Embodiment 1, this embodiment also includes a placement box 4 for the battery box, as detailed below:

[0087] Please refer to Figure 1 , Figure 7 and Figure 8As shown, a placement box 4 is connected to one outer side wall of the housing 1 along a first direction. A BMS module 5, electrically connected to the battery cell 22, is placed inside the placement box 4. The end of the placement box 4 away from the housing 1 includes a first plate 41, a second plate 42, a third plate 43, and a fourth plate 44 connected sequentially from top to bottom. The first plate 41 and the third plate 43 are inclined, while the second plate 42 and the fourth plate 44 are vertical. A limiting rib 45 is provided at the bottom of the inner cavity of the placement box 4. A fourth buffer pad 51 is provided on the bottom of the support of the BMS module 5, and the fourth buffer pad 51 abuts against the end face of the placement box 4 near the housing 1.

[0088] Example 4

[0089] This embodiment further defines the installation of the BMS module 5 on the placement box 4 based on embodiment 3, as follows:

[0090] Please refer to Figure 7 , Figure 9 and Figure 10 As shown, the top of the placement box 4 is provided with a mounting rib 46, and the buckle 6 is provided on the mounting rib 46. The bracket of the BMS module 5 is provided with a card interface 52, and the buckle 6 passes through the card interface 52 and engages with the bracket of the BMS module 5. The buckle 6 has a mounting chamber 61 into which the mounting rib 46 extends. The buckle 6 is provided with a first elastic element 62 and a second elastic element 63. The first elastic element 62 is located inside the mounting chamber 61 and extends upward at a first free end. The second elastic element 63 is located outside the buckle 6 and extends downward at a second free end. When the mounting rib 46 extends into the mounting chamber 61, the first free end of the first elastic element 62 abuts against the side wall of the mounting rib 46. When the buckle 6 passes through the card interface 52, the second free end of the second elastic element 63 abuts against the bracket of the BMS module 5.

[0091] Example 5

[0092] Based on Embodiment 1, the connection structure between the battery box body 1 and the load-bearing base 7 in this embodiment is as follows:

[0093] Please refer to Figure 1 , Figure 11 , Figure 12 and Figure 13As shown, a connecting plate 11 is provided on the outer side wall of the housing 1 along the second direction. The connecting plate 11 has multiple locking holes 111. The connecting plate 11 is threadedly connected to the load-bearing base 7 via screws passing through the locking holes 111. An insert 8 is embedded within each locking hole 111. The top of the insert 8 has a first through hole 81, and the bottom of the insert 8 has a second through hole 82 communicating with the first through hole 81. A rivet nut is provided on the load-bearing base 7, and the rivet nut is located within the second through hole 82. The connecting plate 11 is threadedly connected to the rivet nut located within the second through hole 82 via screws passing through the first through hole 81. A groove 83 is provided along the contour of the outer side wall of the insert 8, and a protrusion 1111 extending into the groove 83 is provided within each locking hole 111. A reinforcing rib 112 is provided on the surface of the connecting plate 11 and at one or both ends of the locking hole 111, and the reinforcing rib 112 extends to the outer side wall of the housing 1 along the second direction. A transverse reinforcing rib 12 is provided on the outer side wall of the housing 1 along the second direction, and the transverse reinforcing rib 12 intersects with the reinforcing rib 112.

[0094] Example 6

[0095] This embodiment further defines the structure of the load-bearing base 7 based on embodiment five, as follows:

[0096] Please refer to Figure 14 As shown, a fixing plate 71 is provided on the load-bearing base 7, and the fixing plate 71 is connected to the bottom of the box body 1. A reinforcing beam 72 is provided at the bottom of the load-bearing base 7.

[0097] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent modifications made based on the content of the present invention specification and drawings, or direct or indirect applications in related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A battery box, characterized in that: The device includes a housing and a battery cell module disposed in the inner cavity of the housing, as well as a buckle; the battery cell module includes a buffer and multiple electrically connected battery cells, each of the battery cells being arranged in the inner cavity of the housing along a first direction or a second direction, the first direction being perpendicular to the second direction, and each of the battery cells being provided with a buffer to form a liquid flow channel for the flow of insulating coolant between adjacent battery cells; A placement box is connected to one of the outer side walls of the housing along the first direction. A BMS module electrically connected to the battery cell is placed in the inner cavity of the placement box. The end face of the placement box away from the housing is stepped so that the inner cavity space of the placement box increases from the bottom to the top. The end of the placement box away from the box body includes a first plate, a second plate, a third plate and a fourth plate connected sequentially from top to bottom, wherein the first plate and the third plate are inclined. The top of the placement box is provided with mounting ribs, the buckle is provided on the mounting ribs, and the bracket of the BMS module is provided with a card interface. The buckle passes through the card interface and engages with the bracket of the BMS module. The buckle has a mounting chamber into which the mounting ribs extend. The buckle is provided with a first elastic element and a second elastic element. The first elastic element is located inside the mounting chamber and extends upward at a first free end. The second elastic element is located outside the buckle and extends downward at a second free end. When the mounting rib extends into the mounting cavity, the first free end of the first elastic element abuts against the side wall of the mounting rib. When the buckle passes through the card interface, the second free end of the second elastic element abuts against the bracket of the BMS module.

2. The battery box according to claim 1, characterized in that: The buffer includes a first buffer pad and a second buffer pad; the first buffer pad is disposed on the top surface of the battery cell, and the second buffer pad is wrapped around the bottom of the battery cell.

3. The battery box according to claim 1, characterized in that: It also includes a fixing component, which includes an end plate and a steel strip; the end plates are provided on the outer side walls at both ends of the housing along the first direction, and the steel strip connects the end plates located on the outer side walls at both ends of the housing along the first direction.

4. The battery box according to claim 3, characterized in that: The fixing component also includes a third buffer pad, which is disposed between the end plate and the housing.

5. The battery box according to claim 3, characterized in that: A limiting component is provided on the end face of the end plate away from the box body, and the limiting component and the end plate form an assembly space; The steel strip has flanges at both ends along its length, and the flanges are located within the assembly space and connected to the end plate.

6. The battery box according to claim 5, characterized in that: A gap is left between the position where the steel strip is bent to form a folded edge and the end plate.

7. The battery box according to claim 1, characterized in that: The second and fourth plates are set vertically.

8. The battery box according to claim 1, characterized in that: The bottom of the inner cavity of the placement box is provided with limiting ribs.

9. The battery box according to claim 1, characterized in that: A fourth buffer pad is provided on the bottom of the bracket of the BMS module, and the fourth buffer pad abuts against the end face of the placement box near the box body.

10. The battery box according to claim 1, characterized in that: It also includes a load-bearing base, and a connecting plate is provided on the outer side wall of the housing along the second direction. The connecting plate is provided with multiple locking holes, and the connecting plate is threadedly connected to the load-bearing base by screws passing through the locking holes.

11. The battery box according to claim 10, characterized in that: An insert is embedded in the locking hole. The top of the insert has a first through hole, and the bottom of the insert has a second through hole communicating with the first through hole. A rivet nut is provided on the load-bearing base, and the rivet nut is located in the second through hole. The connecting plate is threadedly connected to the rivet nut located in the second through hole by a screw passing through the first through hole.

12. The battery box according to claim 11, characterized in that: The outer side wall of the insert is provided with a groove along the contour, and the locking hole is provided with a protrusion that extends into the groove.

13. The battery box according to claim 10, characterized in that: The connecting plate has reinforcing ribs on one or both sides of the locking hole, and the reinforcing ribs extend to the outer wall of the housing along the second direction.

14. The battery box according to claim 13, characterized in that: The outer side wall of the box body along the second direction is provided with transverse reinforcing ribs, and the transverse reinforcing ribs intersect with each other.

15. The battery box according to claim 10, characterized in that: A fixing plate is provided on the load-bearing base, and the fixing plate is connected to the bottom of the box.

16. The battery box according to claim 1, characterized in that: An explosion-proof valve is installed at the top of the enclosure. The inlet of the explosion-proof valve is connected to the inner cavity of the enclosure, and the outlet of the explosion-proof valve is connected to the external environment of the enclosure.

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