Battery compartment

Abstract

The present invention relates to the technical field of energy storage, and in particular to a battery compartment, comprising a compartment body and a battery cell module arranged in an inner cavity of the compartment body, wherein the battery cell module comprises buffer members and a plurality of battery cells that are electrically connected; the battery cells are arranged in the inner cavity of the compartment body in a first direction or a second direction of the compartment body, the first direction being perpendicular to the second direction; and each battery cell is provided with a buffer member to form a liquid flow channel between adjacent battery cells to allow an insulating cooling liquid to flow. The present invention provides a battery compartment allowing for immersion battery cell cooling, which can prevent thermal propagation between battery cells.

Description

A battery box Technical Field

[0001] The present invention relates to the field of energy storage technology, and in particular to a battery box. Background Art

[0002] With the rapid development of the new energy industry, new energy vehicles and lithium-ion battery energy storage have been widely used. However, both the automotive and energy storage industries have increasingly stringent requirements for battery pack range and charge / discharge rates. However, high charge / discharge rates and demanding operating conditions generate significant heat, which can cause thermal runaway in the battery cells and lead to safety accidents. Currently, there are two cooling methods for battery cells: air cooling and water cooling. Water cooling involves placing a cooling component at the bottom of the battery pack to both support and cool the battery pack. However, this method cannot completely prevent heat spread from the battery cells. Technical issues

[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 heat spread from the battery cells. Technical Solutions

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is: a battery box, comprising a box body and a battery cell module arranged in the inner cavity of the box body; the battery cell module comprises a buffer and a plurality of electrically connected battery cells, each of the battery cells is arranged in the inner cavity of the box body along a first direction or a second direction of the box body, the first direction is perpendicular to the second direction, and a buffer is provided on each of the battery cells to form a liquid flow channel for the flow of insulating coolant between adjacent battery cells. Beneficial effects

[0005] The beneficial effects of the present invention lie in: adding an insulating coolant, such as a fluorinated liquid, to the inner cavity of the box, then electrically connecting multiple battery cells and immersing them in the insulating coolant. Meanwhile, buffers are provided on the battery cells to isolate each cell to form a liquid flow channel, allowing the insulating coolant to flow between each cell. This not only ensures the cooling of each cell but also prevents heat from spreading to other cells. The provision of the buffers also ensures the shock resistance of each cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] FIG1 is a schematic diagram of an exploded structure of a battery box in a specific embodiment of the present invention;

[0007] FIG2 is a schematic cross-sectional view of a battery box in a specific embodiment of the present invention, wherein a cell module is assembled in the box;

[0008] FIG3 is a schematic diagram of the main structure of a battery box in a specific embodiment of the present invention;

[0009] FIG4 is a schematic structural diagram of an end plate of a battery box in a specific embodiment of the present invention;

[0010] FIG5 is a cross-sectional view of the battery box in FIG4 taken along the AA direction;

[0011] FIG6 is a cross-sectional view of a battery box taken along line BB in FIG4 ;

[0012] FIG7 is a schematic diagram of the assembly structure of a BMS module of a battery box on a placement box in a specific embodiment of the present invention;

[0013] FIG8 is a schematic structural diagram of a BMS module of a battery box in a specific embodiment of the present invention;

[0014] FIG9 is a schematic structural diagram of a buckle of a battery box in an embodiment of the present invention in an application state;

[0015] FIG10 is a schematic structural diagram of a buckle of a battery box in a specific embodiment of the present invention;

[0016] FIG11 is a schematic diagram of the box structure of a battery box in a specific embodiment of the present invention;

[0017] FIG12 is a schematic diagram of an exploded structure of an insert and a connecting plate of a battery box in a specific embodiment of the present invention;

[0018] FIG13 is a schematic cross-sectional view of an insert of a battery box in a specific embodiment of the present invention;

[0019] FIG14 is a schematic structural diagram of a load-bearing base of a battery box in a specific embodiment of the present invention;

[0020] Description of labels:

[0021] 1. Box body; 11. Connecting plate; 111. Locking hole; 1111. Boss; 112. Reinforcement rib; 12. Horizontal reinforcement rib; 13. Explosion-proof valve; 14. Mounting piece; 141. Boss; 1411. Installation hole;

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

[0023] 3. Fixing assembly; 31. End plate; 311. Limiting piece; 312. Reinforcement rib; 313. Lifting process hole; 32. Steel belt; 321. Folding edge;

[0024] 4. Placement box; 41. First plate; 42. Second plate; 43. Third plate; 44. Fourth plate; 45. Positioning rib; 46. Mounting rib;

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

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

[0027] 7. Load-bearing base; 71. Fixed plate; 72. Reinforcement beam;

[0028] 8. Insert; 81. First through hole; 82. Second through hole; 83. Groove. Modes for Carrying Out the Invention

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

[0030] With the rapid development of the new energy industry, new energy vehicles and lithium-ion battery energy storage have been widely used. However, both the automotive and energy storage industries have increasingly stringent requirements for battery pack range and charge / discharge rates. However, high charge / discharge rates and demanding operating conditions generate significant heat, which can cause thermal runaway in the battery cells and lead to safety accidents. Currently, there are two cooling methods for battery cells: air cooling and water cooling. Water cooling involves placing a cooling component at the bottom of the battery pack to both support and cool the battery pack. However, this method cannot completely prevent heat spread from the battery cells.

[0031] Based on this, the present application provides a battery box that can solve the problem of heat spread in battery cells.

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

[0033] Please refer to Figures 1 and 2. The present invention provides a battery box, comprising a box body 1 and a cell module 2 disposed in the inner cavity of the box body 1; the cell module 2 comprises a buffer 21 and a plurality of electrically connected cells 22, each of the cells 22 being arranged in the inner cavity of the box body 1 along a first direction or a second direction of the box body 1, wherein the first direction is perpendicular to the second direction, and a buffer 21 is provided on each of the cells 22 to form a liquid flow channel for the flow of insulating coolant between adjacent cells 22. The material of the box body is thermoplastic plastic or composite material, preferably PP or prepreg epoxy resin. In this way, the box body 1 can achieve compatibility with insulating coolants such as fluorinated liquids, and can achieve the thermal insulation performance and formability of the structural design of the battery pack in a cold current environment.

[0034] As can be seen from the above description, the beneficial effects of the present invention are as follows: adding an insulating coolant such as fluorinated liquid to the inner cavity of the box body 1, then electrically connecting multiple battery cells 22 and immersing them in the insulating coolant, and at the same time providing a buffer 21 on the battery cells 22 to isolate each battery cell 22 to form a liquid flow channel for the insulating coolant to flow, so that the insulating coolant can pass between each battery cell 22, not only ensuring the cooling of each battery cell 22, but also preventing the heat from spreading to other battery cells. At the same time, the provision of the buffer 21 also ensures the shock resistance of each battery cell 22.

[0035] In an optional embodiment, please refer to Figures 1 and 9, a mounting member 14 is provided in the box body 1 along the arrangement direction of the battery cells 22 in the inner cavity of the box body 1, and a plurality of bosses 141 are provided on the top of the mounting member 14, and a placement hole 1411 is provided on the boss 141 for limiting the placement of nuts. By providing the placement hole 1411, the in-mold injection-molded nut can be eliminated, which can reduce the occurrence of cracking during the injection molding process. During the assembly process, the aluminum bar that electrically connects the battery cells 22 only needs to be placed in the placement hole 1411. The gap between the inner wall of the placement hole 1411 and the outer wall of the nut is 0.2-0.8mm, which can prevent the inability to assemble due to processing errors.

[0036] In an optional embodiment, as shown in FIG1 , the box body and the box cover of the box body 1 are sealed by connecting them with sealing strips and bolts.

[0037] Referring to Figures 1 and 2 , the buffer member 21 further comprises a first buffer pad 211 and a second buffer pad 212. The first buffer pad 211 is positioned on the top surface of the battery cell 22, while the second buffer pad 212 wraps around the bottom of the battery cell 22. The first buffer pad 211 is a sheet-like structure that covers the top surface of the battery cell 22, while the second buffer pad 212 has a U-shaped cross-section that wraps 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 foam with buffering properties and a rigid insulating material, such as silicone rubber or MPP.

[0038] As can be seen from the above description, the first and second buffer pads 211, 212 form a liquid flow channel between adjacent battery cells 22, allowing the insulating coolant to flow between each battery cell 22. This not only ensures the cooling of each battery cell 22, but also prevents heat from spreading to other battery cells. Furthermore, the first and second buffer pads 211, 212 work together to ensure the shock resistance of each battery cell 22.

[0039] Referring to Figures 1 and 3 , the battery case further includes a fixing assembly 3 comprising end plates 31 and a steel band 32. The end plates 31 are provided on the outer side walls of the case 1 at both ends along the first direction, and the steel band 32 connects the end plates 31 located on the outer side walls of the case 1 at both ends along the first direction. The end plates 31 are preferably made of a material such as an aluminum alloy or a magnesium alloy through a die-casting process.

[0040] As can be seen from the above description, in order to reduce the deformation of the entire battery box caused by the expansion force generated by the battery cells 22 during operation, end plates 31 are provided at both ends of the box body 1 and connected by steel strips 32. In addition, compared with directly fixing the battery cell modules 2 inside the box body 1, the provision of fixing components 3 outside the box body 1 can improve the space utilization of the inner cavity of the box body 1, thereby increasing the power of the battery cells 22 and reducing the amount of insulating coolant used.

[0041] Furthermore, the fixing assembly 3 further includes a third buffer pad (not shown in the figure), which is arranged between the end plate 31 and the box body 1. The third buffer pad is preferably made of MPP buffer material and is preferably bonded between the end plate 31 and the box body 1 using double-sided adhesive.

[0042] From the above description, it can be seen that the expansion force generated during the operation of the battery cell 22 will first be partially absorbed and resisted by the box body 1 and the third buffer pad, and finally transmitted to the fixing component 3, which can minimize the impact of the expansion force on the outer contour size of the product.

[0043] Referring to Figure 4 , a limiter 311 is further provided on one end face of the end plate 31 away from the housing 1. The limiter 311 and the end plate 31 form an assembly space. Folding edges 321 are provided at both ends of the steel strip 32 along its length. The folding edges 321 are located within the assembly space and connected to the end plate 31. The limiter 311 is preferably a stopper protruding from the end plate 31. However, to limit the steel strip 32, the limiter 311 can also be considered a notch forming an assembly space in the end plate 31.

[0044] From the above description, it can be seen that the steel belt 32 is connected to the end plate 31 by placing the folded edge 321 in the assembly space formed by the limit piece 311 and the end plate 31, so as to prevent the other end of the steel belt 32 from tilting up and injuring people when one end of the steel belt 32 is locked.

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

[0046] From the above description, it can be seen that the gap between the position where the steel strip 32 is bent to form the folded edge 321 and the end plate 31 can ensure that the subsequent expansion of the battery cell 22 will not damage the box body 1, and ensure that the battery cell 22 will not have serious bulging and lithium deposition.

[0047] In an optional embodiment, as shown in FIG4 , a plurality of reinforcing ribs 312 and a plurality of hoisting process holes 313 are provided on the end surface of the end plate 31 away from the box body 1; the reinforcing ribs 312 are provided to enhance the strength of the end plate 31, thereby preventing the battery cell 22 from bulging. The provided hoisting process holes 313 facilitate the transportation of the end plate 31 in the workshop. Among them, the reinforcing ribs 312 arranged in the middle part of the end surface of the end plate 31 are relatively sparse, and the reinforcing ribs 312 arranged in the upper and lower parts of the end surface of the end plate 31 are relatively dense. Considering that the bulging of the battery cell 22 mainly occurs in the middle area. When the battery cell 22 expands, the end plate 31 can expand naturally due to the sparse reinforcing ribs 312 in the middle part, thereby reducing stress concentration and avoiding the risk of cracking of the box body 1 and the end plate 31.

[0048] In an optional embodiment, as shown in FIG5 and FIG6, the angle C between the reinforcing rib 312 and the horizontal is 90 degrees, and the angle D between the end surface of the end plate 31 away from the box body 1 and the horizontal is 91 degrees.

[0049] In an optional embodiment, the length of the end plate 31 is greater than the length of the corresponding side wall against the box body 1, so that the space required for locking the end plate 31 and the steel belt 32 using a torque tool can be reserved.

[0050] 1 and 7 , further, a placement box 4 is connected to an outer side wall of the box body 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 an outer side wall of the box body 1 along the first direction, which can reduce the overall height of the battery box.

[0052] As shown in FIG. 7 , further, one end surface of the placement box 4 away from the box body 1 is stepped so that the inner cavity space of the placement box 4 increases gradually from the bottom to the top.

[0053] Please refer to Figure 7, 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 in sequence 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 vertically arranged.

[0054] From the above description, it can be seen that the tilted setting of the first plate 41 can not only maximize the inner cavity space at the top of the placement box 4, so that the high and low voltage plug wires of the BMS module 5 can be located therein, but also further reduce the overall height of the battery box; the second plate 42 is vertically set to facilitate the use of various labels; the purpose of the tilted setting of the third plate 43 and the vertical setting of the fourth plate 44 is to limit the bottom of the BMS module 5 to prevent the BMS module 5 from moving.

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

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

[0057] 7 and 8 , further, a fourth cushion 51 is provided on the bottom of the bracket of the BMS module 5 , and the fourth cushion 51 abuts against an end surface of the placement box 4 close to the box body 1 . The fourth cushion 51 is an L-shaped cushion 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 and down or left and right in the placement box 4 , but also provide buffer protection for the BMS module 5 .

[0059] In an optional embodiment, the end surface of the placement box 4 close to the box body 1 is inclined toward the end surface of the placement box 4 away from the box body 1, the purpose of which is to facilitate mold demolding after injection molding is completed.

[0060] In an optional embodiment, the length of the placement box 4 is shorter than the length of the corresponding side wall against the box body 1, which can leave enough space for the locking of the steel belt 32 and the end plate 31.

[0061] Please refer to Figures 7 and 9. Further, a battery box also includes a clip 6. The top of the placement box 4 is provided with a mounting rib 46. The clip 6 is arranged on the mounting rib 46. The bracket of the BMS module 5 is provided with a card interface 52. The clip 6 passes through the card interface 52 and is clipped to the bracket of the BMS module 5.

[0062] As can be seen from the above description, a buckle 6 is provided on the mounting rib 46 of the placement box 4 , and a card interface 52 engaged 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 through the buckle 6 .

[0063] Referring to Figures 9 and 10 , the buckle 6 further comprises a mounting cavity 61 into which the mounting rib 46 extends. The buckle 6 is provided with a first elastic member 62 and a second elastic member 63. The first elastic member 62 is located within the mounting cavity 61 and extends upward at a first free end. The second elastic member 63 is disposed outside the buckle 6 and extends downward at a second free end. When the mounting rib 46 extends into the mounting cavity 61, the first free end of the first elastic member 62 abuts against the sidewall of the mounting rib 46. When the buckle 6 passes through the card interface 52, the second free end of the second elastic member 63 abuts against the bracket of the BMS module 5. The second elastic member 63 is preferably an L-shaped elastic strip.

[0064] It can be seen from the above description that in order to reduce the difficulty of injection molding, a separate clip 6 with an installation chamber 61 is provided. When the clip 6 is assembled on the placement box 4, the installation rib 46 of the placement box 4 is inserted into the installation chamber 61 of the clip 6. Since there is a first elastic member 62 in the installation chamber 61 of the clip 6, the installation rib 46 will push the first elastic member 62 open during the process of extending into the installation chamber 61, and the free end of the first elastic member 62 will always exert force on the installation rib 46 due to the action of elastic force, thereby reliably fixing the clip 6 on the placement box 4.

[0065] When the clip 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 toward the installation chamber 61 until the second elastic member 63 completes passing through the card interface 52. The second elastic member 63 is reset, thereby clamping the BMS module 5 in the placement box 4.

[0066] Referring to Figures 1, 11, and 12, the battery box further comprises a load-bearing base 7. A connecting plate 11 is provided on the outer sidewall 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 via 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 can be seen from the above description, the box body 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 Figures 12 and 13. Furthermore, an insert 8 is embedded in the locking hole 111, a first through hole 81 is provided on the top of the insert 8, and a second through hole 82 connected to the first through hole 81 is provided on 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. The connecting plate 11 is threadedly connected to the rivet nut located in the second through hole 82 by screws passing through the first through hole 81.

[0069] As can be seen from the above description, the insert 8 is embedded in the locking hole 111, and the rivet nut on the load-bearing base 7 can be inserted into the second through hole 82 of the insert 8. During the connection between the box body 1 and the load-bearing base 7, a screw is passed 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] 12 and 13 , further, 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 in the locking hole 111 .

[0071] As can be seen from the above description, the cooperation between the protrusion 1111 and the groove 83 can ensure the pulling force of the insert 8 on the connecting plate 11, thereby ensuring that the box body 1 and the load-bearing base 7 will not loosen during transportation or vibration.

[0072] 11 and 12 , further, a reinforcing rib 112 is provided on the plate surface of the connecting plate 11 and located at one end or both ends of the locking hole 111 , and the reinforcing rib 112 extends to the outer side wall of the box body 1 along the second direction.

[0073] As shown in FIG. 11 , transverse reinforcing ribs 12 are provided on the outer side wall of the box body 1 along the second direction, and the transverse reinforcing ribs 12 intersect with the reinforcing ribs 112 .

[0074] From the above description, it can be seen that only reinforcing ribs 112 are added corresponding to the locking holes 111, and a small number of transverse reinforcing ribs 12 are set on the box body 1, which not only ensures the strength of the connection between the box body 1 and the load-bearing base 7, but also avoids the box body 1 from being too strong, thereby allowing the box body 1 to deform naturally as the battery cell 22 expands, so as to avoid stress concentration causing the box body 1 to crack.

[0075] As shown in FIG. 14 , 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 body 1 through the fixing plate 71 can further strengthen the connection between the load-bearing base 7 and the box body 1.

[0077] In an optional embodiment, as shown in FIG14 , a reinforcing beam 72 is provided at the bottom of the load-bearing base 7 , and the reinforcing beam 72 enhances the strength of the load-bearing base 7 to reduce the influence of the box body 1 on the shape of the load-bearing base 7 as the battery cell 22 expands.

[0078] As shown in FIG1 , an explosion-proof valve 13 is provided at the top of the box body 1 , an air inlet of the explosion-proof valve 13 is communicated with the inner cavity of the box body 1 , and an air outlet of the explosion-proof valve 13 is communicated with the external environment of the box body 1 .

[0079] As can be seen from the above description, if the battery cell 22 experiences thermal runaway and the insulating coolant absorbs heat and vaporizes, if the pressure inside the box 1 is too high, the explosion-proof valve 13 will open to release the pressure, preventing the excessive pressure inside the box 1 from causing an explosion. At the same time, the insulating coolant can be replenished by injecting it into the box 1 through the explosion-proof valve 13.

[0080] Example 1

[0081] A battery box, as shown in Figures 1 and 2, includes a box body 1 and a cell module 2 disposed in the inner cavity of the box body 1; the cell module 2 includes a buffer 21 and a plurality of electrically connected cells 22, each of the cells 22 being arranged in the inner cavity of the box body 1 along a first direction or a second direction of the box body 1, wherein the first direction is perpendicular to the second direction, and each of the cells 22 is provided with a buffer 21 to form a liquid flow channel between adjacent cells 22. The buffer 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 cell 22, and the second buffer pad 212 is wrapped around the bottom of the cell 22. An explosion-proof valve 13 is provided at the top of the box body 1, the air inlet end of the explosion-proof valve 13 being in communication with the inner cavity of the box body 1, and the air outlet end of the explosion-proof valve 13 being in communication with the external environment of the box body 1.

[0082] Example 2

[0083] This embodiment further includes a battery box 3 based on the first embodiment, specifically as follows:

[0084] Please refer to Figures 1 and 3. The fixing assembly 3 includes an end plate 31 and a steel belt 32. The end plates 31 are provided on the outer walls of the box body 1 at both ends along the first direction. The steel belt 32 connects the end plates 31 located on the outer walls of the box body 1 at both ends along the first direction. The fixing assembly 3 also includes a third buffer pad (not shown in the figure), which is provided between the end plate 31 and the box body 1. A limit member 311 is provided on an end surface of the end plate 31 away from the box body 1. The limit member 311 and the end plate 31 form an assembly space. The steel belt 32 is provided with folded edges 321 at both ends along the length direction. The folded edges 321 are located in the assembly space and connected to the end plates 31. A gap is left between the position where the steel belt 32 is bent to form the folded edge 321 and the end plate 31.

[0085] Example 3

[0086] This embodiment further includes a battery box 4 based on the first embodiment, specifically as follows:

[0087] Please refer to Figures 1, 7 and 8. A placement box 4 is connected to an outer wall of the box body 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. 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 in sequence from top to bottom. The first plate 41 and the third plate 43 are arranged at an angle, and the second plate 42 and the fourth plate 44 are arranged vertically. 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 bracket of the BMS module 5, and the fourth buffer pad 51 rests on an end face of the placement box 4 close to the box body 1.

[0088] Example 4

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

[0090] Referring to Figures 7, 9, and 10, a mounting rib 46 is provided on the top of the placement box 4. The clip 6 is disposed on the mounting rib 46. A snap interface 52 is provided on the bracket of the BMS module 5. The clip 6 passes through the snap interface 52 and engages with the bracket of the BMS module 5. The clip 6 has a mounting cavity 61 into which the mounting rib 46 extends. The clip 6 is provided with a first elastic member 62 and a second elastic member 63. The first elastic member 62 is located within the mounting cavity 61 and extends upward at an angle to form a first free end. The second elastic member 63 is disposed outside the clip 6 and extends downward at an angle to form a second free end. When the mounting rib 46 extends into the mounting cavity 61, the first free end of the first elastic member 62 abuts against the side wall of the mounting rib 46. When the clip 6 passes through the snap interface 52, the second free end of the second elastic member 63 abuts against the bracket of the BMS module 5.

[0091] Example 5

[0092] The connection structure between the battery box body 1 and the load-bearing base 7 of this embodiment is as follows:

[0093] Referring to Figures 1, 11, 12, and 13, a connecting plate 11 is provided on the outer sidewall of the housing 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. An insert 8 is embedded within the locking holes 111. The insert 8 has a first through-hole 81 at its top and a second through-hole 82 at its bottom that communicates with the first through-hole 81. A rivet nut is provided on the load-bearing base 7 and is positioned within the second through-hole 82. The connecting plate 11 is threadedly connected to the rivet nut within the second through-hole 82 by screws passing through the first through-hole 81. A groove 83 is provided along the outer sidewall of the insert 8. The locking holes 111 are provided with protrusions 1111 that extend into the grooves 83. A reinforcing rib 112 is provided on the surface of the connecting plate 11 at one or both ends of the locking hole 111, and the reinforcing rib 112 extends to the outer wall of the box body 1 along the second direction. Transverse reinforcing ribs 12 are provided on the outer wall of the box body 1 along the second direction, and the transverse reinforcing ribs 12 intersect with the reinforcing ribs 112.

[0094] Example 6

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

[0096] 14 , 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 descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent transformations made using the contents of the present invention's description and drawings, or directly or indirectly applied in related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A battery box, characterized in that: It comprises a box body and a battery cell module arranged in the inner cavity of the box body; the battery cell module comprises a buffer and a plurality of electrically connected battery cells, each of the battery cells is arranged in the inner cavity of the box body along a first direction or a second direction of the box body, the first direction is perpendicular to the second direction, and a buffer is arranged on each of the battery cells to form a liquid flow channel for the flow of insulating coolant between adjacent battery cells.

2. The battery box according to claim 1, characterized in that: The buffer member includes a first buffer pad and a second buffer pad; the first buffer pad is arranged on the top surface of the battery cell, and the second buffer pad is wrapped on 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 belt; the end plates are arranged on the outer side walls at both ends of the box along the first direction, and the steel belt connects the end plates located on the outer side walls at both ends of the box along the first direction.

4. The battery box according to claim 3, characterized in that: The fixing assembly further includes a third buffer pad, and the third buffer pad is arranged between the end plate and the box body.

5. The battery box according to claim 3, characterized in that: A limiting member is arranged on an end surface of the end plate away from the box body, and the limiting member and the end plate form an assembly space; The steel strip is provided with folded edges at both ends along the length direction, and the folded edges are located in the assembly space and connected to the end plates.

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: A placement box is connected to an outer side wall of the box along a first direction, and a BMS module electrically connected to the battery cell is placed in an inner cavity of the placement box.

8. The battery box according to claim 7, characterized in that: One end surface of the placement box away from the box body is stepped so that the inner cavity space of the placement box increases gradually from the bottom to the top.

9. The battery box according to claim 8, characterized in that: 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 in sequence from top to bottom, the first plate and the third plate are inclined, and the second plate and the fourth plate are vertically arranged.

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

11. The battery box according to claim 7, characterized in that: A fourth buffer pad is arranged on the bottom of the bracket of the BMS module, and the fourth buffer pad abuts against an end surface of the placement box close to the box body.

12. The battery box according to claim 7, characterized in that: It also includes a buckle, the top of the placement box is provided with a mounting rib, the buckle is arranged on the mounting rib, the bracket of the BMS module is provided with a card interface, and the buckle passes through the card interface and is connected with the bracket of the BMS module.

13. The battery box according to claim 12, characterized in that: The buckle has a mounting cavity for the mounting rib to extend into, and the buckle is provided with a first elastic member and a second elastic member, the first elastic member is located in the mounting cavity, and the first elastic member extends upwardly at an angle to a first free end, and the second elastic member is arranged outside the buckle, and the second elastic member extends downwardly at an angle to a second free end; When the mounting rib extends into the mounting chamber, the first free end of the first elastic member 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 member abuts against the bracket of the BMS module.

14. The battery box according to claim 1, characterized in that: It also includes a load-bearing base. A connecting plate is arranged on the outer side wall of the box body along the second direction. A plurality of locking holes are arranged on the connecting plate. The connecting plate is threadedly connected to the load-bearing base by screws passing through the locking holes.

15. The battery box according to claim 14, characterized in that: An insert is embedded in the locking hole, a first through hole is arranged on the top of the insert, a second through hole connected to the first through hole is arranged on the bottom of the insert, a rivet nut is arranged on the load-bearing base, and the rivet nut is located in the second through hole, and the connecting plate is threadedly connected to the rivet nut located in the second through hole by screws passing through the first through hole.

16. The battery box according to claim 15, characterized in that: A groove is arranged along the contour of the outer side wall of the insert, and a convex block extending into the groove is arranged in the locking hole.

17. The battery box according to claim 14, characterized in that: A reinforcing rib is provided on the plate surface of the connecting plate and located at one end or both ends of the locking hole, and the reinforcing rib extends to the outer side wall of the box body along the second direction.

18. The battery box according to claim 17, 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 the reinforcing ribs.

19. The battery box according to claim 14, characterized in that: A fixing plate is arranged on the load-bearing base, and the fixing plate is connected to the bottom of the box body.

20. The battery box according to claim 1, characterized in that: An explosion-proof valve is arranged at the top of the box body, an air inlet end of the explosion-proof valve is communicated with the inner cavity of the box body, and an air outlet end of the explosion-proof valve is communicated with the external environment of the box body.

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