Double-deck modular battery pack

Abstract

This utility model relates to the field of energy storage technology and discloses a dual-layer modular battery pack, including a housing and a support structure, a first battery module, a second battery module, a first fixing structure, a second fixing structure, and a third fixing structure located within the housing. The support structure includes a bracket and multiple support columns. All support columns are fixed at intervals below the bracket and adjacent to the outer periphery of the bracket. Each support column is fixedly connected to the housing through a first fixing structure. The first battery module is fixed to the bracket through multiple second fixing structures. The second battery module is located below the bracket and is fixedly connected to the housing through multiple third fixing structures. The dual-layer modular battery pack of this utility model has a stable structure and can solve the problem of installation reliability of dual-layer modules within the housing.

Description

Technical Field

[0001] This utility model relates to the field of energy storage technology, and in particular to a dual-layer modular battery pack. Background Technology

[0002] In recent years, the new energy vehicle industry has developed rapidly, but insufficient driving range has always been a bottleneck restricting its development. Current technologies typically increase driving range by increasing the energy density of the battery pack or by increasing the number of modules to increase the total battery energy. Furthermore, to improve the space utilization of electric vehicles, a dual-layer module arrangement is often used to increase the total battery energy within a limited chassis space.

[0003] In the existing technology, the upper and lower modules are spaced apart by support components and fixedly connected to the support components respectively. The support components are then connected to the housing. That is, the entire double-layer module can only be fixed in the housing through the connection between the support components and the housing, resulting in low installation reliability. Utility Model Content

[0004] The purpose of this utility model embodiment is to provide a double-layer modular battery pack with a stable structure, which solves the problem of installation reliability of double-layer modules in the box.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A dual-layer modular battery pack is provided, including a housing and a support structure, a first battery module, a second battery module, a first fixing structure, a second fixing structure, and a third fixing structure located within the housing. The support structure includes a bracket and a plurality of support columns. All the support columns are fixed at intervals below the bracket and adjacent to the outer periphery of the bracket. Each support column is fixedly connected to the housing through a first fixing structure. The first battery module is fixed to the bracket through a plurality of second fixing structures. The second battery module is located below the bracket and is fixedly connected to the housing through a plurality of third fixing structures.

[0007] As a further embodiment of the dual-layer modular battery pack, each of the support pillars has at least one side facing the second battery module, which contacts the outer wall of the second battery module.

[0008] As a further embodiment of the dual-layer modular battery pack, the first fixing structure includes a first fixing seat and a first locking bolt. At least one of the first fixing seats is protruding from the side of the support column that is not in contact with the second battery module. The first fixing seat is provided with a first connecting hole in the vertical direction. A first threaded hole corresponding to the first connecting hole is provided on the housing. The first locking bolt passes through the first connecting hole and is screwed and fixed to the first threaded hole on the housing.

[0009] As a further embodiment of the dual-layer modular battery pack, the second fixing structure includes a second fixing seat and a plurality of second locking bolts. The second fixing seat protrudes from the outer side wall of the first battery module. The second fixing seat has at least two second connecting holes extending vertically through it. The bracket has second threaded holes corresponding one-to-one with the second connecting holes. The second locking bolts pass through the second connecting holes and are screwed into the second threaded holes on the bracket for fixation; and / or,

[0010] The third fixing structure includes a third fixing seat and a plurality of third locking bolts. The third fixing seat protrudes from the outer side wall of the second battery module. The third fixing seat is provided with at least two third connecting holes in the vertical direction. The housing is provided with third threaded holes that correspond one-to-one with the third connecting holes. The third locking bolts pass through the third connecting holes and are screwed and fixed to the third threaded holes in the housing.

[0011] As a further embodiment of the dual-layer modular battery pack, the first battery module includes a first frame, a first cell, a first liquid cooling plate, and a second liquid cooling plate. The first frame has open ends in the vertical direction. The first liquid cooling plate is fixed to the side of the first frame away from the bracket, and the second liquid cooling plate is fixed to the side of the first frame facing the bracket. The first liquid cooling plate, the first frame, and the second liquid cooling plate form a first receiving cavity. A plurality of the first cells are located in the first receiving cavity. The first liquid cooling plate has a first liquid cooling channel and a first liquid inlet and a first liquid outlet communicating with the first liquid cooling channel. The second liquid cooling plate has a second liquid cooling channel and a second liquid inlet and a second liquid outlet communicating with the second liquid cooling channel. The first receiving cavity is communicating with the first liquid outlet and the second liquid inlet. The first fixing structure is installed on the outer wall of the first frame.

[0012] As a further embodiment of the dual-layer modular battery pack, the second liquid cooling plate is provided with a plurality of first pressure relief holes through it in the vertical direction. The first pressure relief holes are staggered from the second liquid cooling flow channel. The first pressure relief holes correspond one-to-one with the first battery cells. The explosion-proof valve of the first battery cell is directly opposite the first pressure relief hole. The explosion-proof valve is sealed to the first pressure relief hole.

[0013] As a further embodiment of the dual-layer modular battery pack, the second battery module includes a second frame, a second cell, a third liquid cooling plate, and a fourth liquid cooling plate. Both ends of the second frame are open in the vertical direction. The third liquid cooling plate is fixed to the side of the second frame facing the bracket, and the fourth liquid cooling plate is fixed to the side of the second frame away from the bracket. The third liquid cooling plate, the second frame, and the fourth liquid cooling plate form a second receiving cavity, within which multiple second cells are located. The third liquid cooling plate has a third liquid cooling channel and a third liquid inlet and a third liquid outlet communicating with the third liquid cooling channel. The fourth liquid cooling plate has a fourth liquid cooling channel and a fourth liquid inlet and a fourth liquid outlet communicating with the fourth liquid cooling channel. The second receiving cavity communicates with the third liquid outlet and the fourth liquid inlet. The second fixing structure is installed on the outer wall of the second frame.

[0014] As a further embodiment of the dual-layer modular battery pack, the fourth liquid cooling plate is provided with multiple second pressure relief holes in the vertical direction. The second pressure relief holes are staggered from the fourth liquid cooling channel. The second pressure relief holes correspond one-to-one with the second battery cells. The explosion-proof valve of the second battery cell is directly opposite the second pressure relief hole. The explosion-proof valve is sealed to the second pressure relief hole.

[0015] As a further embodiment of the dual-layer modular battery pack, the bracket includes a base plate and a surrounding plate around the base plate. The base plate and the surrounding plate form a pressure relief groove. The opening of the pressure relief groove faces the first battery module. The first battery module is fixed to the surrounding plate by a plurality of the first fixing structures. The support column is fixed below the surrounding plate. The surrounding plate has a first pressure relief channel communicating with the pressure relief groove. The support column has a second pressure relief channel extending to the bottom of the housing. The first pressure relief channel communicates with the second pressure relief channel.

[0016] As a further embodiment of the dual-layer modular battery pack, the bracket also includes heat-insulating mica, with the heat-insulating mica provided on the side of the base plate facing the first battery module, and / or, with the heat-insulating mica provided on the side of the base plate facing the second battery module.

[0017] Beneficial effects:

[0018] This utility model adopts a double-layer modular structure design. The first battery module is fixed on the bracket by the first fixing structure, and the second battery module is located below the bracket and fixed in the box by the second fixing structure. At the same time, the bracket is also fixed in the box by the support column. This structure can stably fix the double-layer module in the box, solving the problem of installation reliability of the double-layer module in the box.

[0019] The dual-layer modular battery pack of this utility model adopts an immersion liquid cooling structure to dissipate heat from the battery cells, and the dual-layer module has an independent pressure relief structure to prevent heat spread from one layer of battery module to the other layer of battery module when thermal runaway occurs. Attached Figure Description

[0020] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0021] Figure 1 This is a schematic diagram of the structure of the dual-layer modular battery pack described in an embodiment of the present invention;

[0022] Figure 2 This is a schematic diagram of the assembly structure of the support structure and the first fixing structure (excluding the first locking bolt) described in an embodiment of the present utility model;

[0023] Figure 3 for Figure 2 A magnified view of part A in the middle;

[0024] Figure 4 This is a schematic diagram of the assembly structure of the first battery module and the second fixing structure (excluding the second locking bolt) in an embodiment of the present utility model.

[0025] Figure 5 for Figure 4 A magnified view of part B in the middle section;

[0026] Figure 6 This is an exploded view of the first battery module in an embodiment of the present invention;

[0027] Figure 7 This is a schematic diagram of the first liquid cooling plate in an embodiment of the present invention;

[0028] Figure 8 This is a schematic diagram of the second liquid cooling plate in an embodiment of the present invention;

[0029] Figure 9 for Figure 8 A magnified view of part C in the middle;

[0030] Figure 10 This is a schematic diagram of the assembly structure of the second battery module and the third fixing structure (excluding the third locking bolt) in an embodiment of the present utility model;

[0031] Figure 11 for Figure 10 A magnified view of part D in the middle;

[0032] Figure 12 This is an exploded view of the second battery module in an embodiment of the present invention;

[0033] Figure 13This is a schematic diagram of the third liquid cooling plate described in an embodiment of the present invention;

[0034] Figure 14 This is a schematic diagram of the fourth liquid cooling plate described in an embodiment of the present invention;

[0035] Figure 15 for Figure 14 A magnified view of part E in the middle.

[0036] In the picture:

[0037] 100. Support structure; 110. Bracket; 111. Base plate; 112. Enclosure; 1121. First pressure relief channel; 113. Pressure relief groove; 114. Thermal insulation mica; 115. Sealing cover; 120. Support column;

[0038] 200, First battery module; 210, First frame; 220, First battery cell; 230, First liquid cooling plate; 231, First liquid inlet; 232, First liquid outlet; 240, Second liquid cooling plate; 241, Second liquid inlet; 242, Second liquid outlet; 243, First pressure relief hole; 250, First insulating bracket;

[0039] 300, Second battery module; 310, Second enclosure; 320, Second battery cell; 330, Third liquid cooling plate; 331, Third liquid inlet; 332, Third liquid outlet; 340, Fourth liquid cooling plate; 341, Fourth liquid inlet; 342, Fourth liquid outlet; 343, Second pressure relief hole; 350, Second insulating bracket;

[0040] 400. First fixing structure; 410. First fixing base; 411. First connecting hole; 420. First locking bolt; 430. First reinforcing part;

[0041] 500. Second fixing structure; 510. Second fixing seat; 511. Second connecting hole; 520. Second locking bolt; 530. Second reinforcing part;

[0042] 600, Third fixing structure; 610, Third fixing seat; 611, Third connecting hole; 620, Third locking bolt; 630, Third reinforcing part. Detailed Implementation

[0043] To make the technical problems solved by this utility model, the technical solutions adopted, and the technical effects achieved clearer, the technical solutions of the embodiments of this utility model will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0044] 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.

[0045] 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.

[0046] In the description of this embodiment, the terms "upper," "lower," "left," and "right," etc., refer to the orientation or positional relationships shown in the accompanying drawings. They are used solely for ease of description and simplification of operation, and do not indicate or imply that the device or component 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. Furthermore, the terms "first," "second," etc., are merely used for distinction in description and have no special meaning.

[0047] like Figure 1 As shown, this utility model embodiment provides a double-layer modular battery pack, which includes a housing (not shown in the figure) and a support structure 100, a first battery module 200, a second battery module 300, a first fixing structure 400, a second fixing structure 500, and a third fixing structure 600 located inside the housing. The support structure 100 includes a bracket 110 and a plurality of support columns 120. All the support columns 120 are fixed at intervals below the bracket 110 and adjacent to the outer periphery of the bracket 110. Each support column 120 is fixedly connected to the housing through a first fixing structure 400. The first battery module 200 is fixed to the bracket 110 through a plurality of second fixing structures 500. The second battery module 300 is located below the bracket 110 and is fixedly connected to the housing through a plurality of third fixing structures 600.

[0048] It is understandable that the first battery module 200 and the second battery module 300 are arranged vertically and horizontally. The first battery module 200 is fixed to the bracket 110 by the first fixing structure 400, and the second battery module 300 is located below the bracket 110 and is fixed to the box by the second fixing structure 500. At the same time, the bracket 110 is also fixed to the box by the support column 120. This structure can stably fix the double-layer module in the box, thereby solving the problem of installation reliability of the double-layer module in the box.

[0049] Furthermore, each support post 120 has at least one side facing the second battery module 300, which contacts the outer side wall of the second battery module 300.

[0050] Since each support column 120 has at least one side that contacts the outer wall of the second battery module 300, when the double-layer modular battery pack is impacted by an external force, the contact between the support column 120 and the second battery module 300 is used to limit the second battery module 300, thereby improving the installation stability of the second battery module 300.

[0051] For example, there are four support columns 120, the bracket 110 is a cuboid structure, the width of the bracket 110 extends along the first direction (X direction in the figure), the length of the bracket 110 extends along the second direction (Y direction in the figure), the four support columns 120 are respectively arranged at the four corners of the bracket 110, the four support columns 120 are fixed below the bracket 110, and the four support columns 120 face the second battery module 300 along the side of the first direction and contact the outer wall of the second battery module 300 respectively, so as to further improve the installation stability of the second battery module 300.

[0052] Furthermore, the cross-section of the support column 120 is L-shaped (not shown in the figure), and the support column 120 has an L-shaped inner sidewall. The L-shaped inner sidewall of each support column 120 contacts the two adjacent outer sidewalls of the second battery module 300, which can simultaneously limit the second battery module 300 along the first direction and the second direction.

[0053] In this embodiment, as Figure 2 and Figure 3 As shown, the first fixing structure 400 includes a first fixing seat 410 and a first locking bolt 420. At least one first fixing seat 410 is provided on the side of the support column 120 that is not in contact with the second battery module 300. The first fixing seat 410 is provided with a first connecting hole 411 through it in the vertical direction (Z direction in the figure). A first threaded hole (not shown in the figure) corresponding to the first connecting hole 411 is provided on the housing. The first locking bolt 420 passes through the first connecting hole 411 and is screwed and fixed to the first threaded hole on the housing.

[0054] A first fixing seat 410 is provided on the side of the support column 120 that is not in contact with the second battery module 300. A first locking bolt 420 is passed through the first connecting hole 411 on the first fixing seat 410 and screwed into the corresponding first threaded hole of the housing to achieve a fixed connection between the support column 120 and the housing.

[0055] For example, the support column 120 contacts the second battery module 300 on one side along the first direction, and a first fixing seat 410 is respectively provided on both sides of the support column 120 along the second direction. Each support column 120 is connected to the housing at two points, which can improve the connection stability between the support column 120 and the housing.

[0056] Furthermore, in order to improve the stability of the connection structure between the support column 120 and the first fixed seat 410, the first fixed structure 400 also includes a first reinforcing part 430, which is connected to the support column 120 and the first fixed seat 410 respectively.

[0057] like Figure 4 and Figure 5 As shown, the second fixing structure 500 includes a second fixing seat 510 and a plurality of second locking bolts 520. The second fixing seat 510 protrudes from the outer side wall of the first battery module 200. The second fixing seat 510 is provided with at least two second connecting holes 511 in the vertical direction. The bracket 110 is provided with second threaded holes (not shown in the figure) that correspond one-to-one with the second connecting holes 511. The second locking bolts 520 pass through the second connecting holes 511 and are screwed and fixed to the second threaded holes on the bracket 110.

[0058] In this embodiment, a second fixing seat 510 is provided on the outer side wall of the first battery module 200, and a plurality of second connecting holes 511 are opened on the second fixing seat 510. A second locking bolt 520 is passed through the corresponding second connecting hole 511 and screwed into the corresponding second threaded hole, thereby fixing the first battery module 200 on the bracket 110.

[0059] For example, there are four second fixing structures 500. Two second fixing structures 500 are fixed to the two side walls of the first battery module 200 along the first direction, and the two second fixing structures 500 are spaced apart along the second direction. With this structural layout, the first battery module 200 can be stably fixed on the bracket 110.

[0060] Each second fixing seat 510 has two second connecting holes 511, which are spaced apart along the second direction. Two second locking bolts 520 are used to fix the second fixing seat 510 to the bracket 110.

[0061] Furthermore, the second fixing structure 500 also includes a plurality of second reinforcing parts 530, which are respectively connected to the outer side wall of the first battery module 200 and the second fixing seat 510 to improve the structural strength of the second fixing structure 500. The number of second reinforcing parts 530 can be one, two, or more. Taking two second reinforcing parts 530 and two second connecting holes 511 as an example, the two second reinforcing parts 530 are spaced apart along the second direction, and the two second reinforcing parts 530 are located between the two second connecting holes 511. This structural design makes the connection between the first battery module 200 and the bracket 110 more stable and reliable.

[0062] like Figure 10 and Figure 11 As shown, the third fixing structure 600 includes a third fixing seat 610 and a plurality of third locking bolts 630. The third fixing seat 610 protrudes from the outer side wall of the second battery module 300. The third fixing seat 610 is provided with at least two third connecting holes 611 in the vertical direction. The housing is provided with third threaded holes (not shown in the figure) that correspond one-to-one with the third connecting holes 611. The third locking bolts 620 pass through the third connecting holes 611 and are screwed and fixed to the third threaded holes in the housing.

[0063] In this embodiment, a third fixing seat 610 is provided on the outer side wall of the second battery module 300, and multiple third connecting holes 611 are opened on the third fixing seat 610. A third locking bolt 620 is passed through the corresponding third connecting hole 611 and screwed into the corresponding third threaded hole, thereby fixing the second battery module 300 in the box.

[0064] For example, there are four third fixing structures 600. Two third fixing structures 600 are fixed to the two side walls of the second battery module 300 along the first direction, and the two third fixing structures 600 are spaced apart along the second direction. With this structural layout, the second battery module 300 can be stably fixed in the box.

[0065] Each third fixing seat 610 has two third connecting holes 611, which are spaced apart along the second direction. Two third locking bolts 620 are used to fix the third fixing seat 610 in the box.

[0066] Furthermore, the third fixing structure 600 also includes several third reinforcing parts 630, which are respectively connected to the outer side wall of the second battery module 300 and the third fixing base 610 to improve the structural strength of the third fixing structure 600. The number of third reinforcing parts 630 can be one, two, or more. Taking two third reinforcing parts 630 and two third connecting holes 611 as an example, the two third reinforcing parts 630 are spaced apart along the second direction, and the two third reinforcing parts 630 are located between the two third connecting holes 611. This structural design makes the connection between the second battery module 300 and the housing more stable and reliable.

[0067] like Figures 6 to 9 As shown, the first battery module 200 includes a first frame 210, a first battery cell 220, a first liquid cooling plate 230, and a second liquid cooling plate 240. The first frame 210 has open ends in the vertical direction. The first liquid cooling plate 230 is fixed to the side of the first frame 210 facing away from the bracket 110, and the second liquid cooling plate 240 is fixed to the side of the first frame 210 facing the bracket 110. The first liquid cooling plate 230, the first frame 210, and the second liquid cooling plate 240 form a first receiving cavity. A first battery cell 220 is located in a first receiving cavity. A first liquid cooling plate 230 has a first liquid cooling channel and a first liquid inlet 231 and a first liquid outlet 232 that are connected to the first liquid cooling channel. A second liquid cooling plate 240 has a second liquid cooling channel and a second liquid inlet 241 and a second liquid outlet 242 that are connected to the second liquid cooling channel. The first receiving cavity is connected to the first liquid outlet 232 and the second liquid inlet 241. A first fixing structure 400 is installed on the outer wall of the first frame 210.

[0068] In this embodiment, the first frame 210 has open ends in the vertical direction, and the open ends are sealed by the first liquid cooling plate 230 and the second liquid cooling plate 240, respectively, thereby forming a relatively sealed first receiving cavity, which can realize the sealed reception of the first battery cell 220 in the first receiving cavity; by providing a first liquid cooling channel in the first liquid cooling plate 230 and a first liquid inlet 231 and a first liquid outlet 232 respectively connected to the first liquid cooling channel, the first liquid outlet 232 is connected to the first receiving cavity, and a second liquid cooling channel is provided in the second liquid cooling plate 240 and a first liquid inlet 231 and a first liquid outlet 232 respectively connected to the second liquid cooling channel. The second liquid inlet 241 and the second liquid outlet 242 are connected to the first receiving cavity. Coolant enters the first liquid cooling channel through the first liquid inlet 231 and flows into the first receiving cavity through the first liquid outlet 232, immersing the first battery cell 220 in the first receiving cavity in the coolant. The coolant directly contacts the first battery cell 220 to dissipate heat. The coolant in the first receiving cavity flows into the second liquid cooling channel through the second liquid inlet 241 and flows out through the second liquid outlet 242. The outflowing coolant can be returned to the first liquid cooling channel via an external circulation cooling drive device. In this embodiment, while using the first liquid cooling plate 230 and the second liquid cooling plate 240 to dissipate heat from the first battery cell 220, the first battery cell 220 in the first receiving cavity is also immersed in coolant for heat dissipation. This improves the heat dissipation efficiency of the first battery cell 220, meets actual heat dissipation requirements, and enhances the safety and service life of the first battery cell 220.

[0069] Among them, the first battery cells 220 are fixed in the first receiving cavity at both ends along their axial direction by the first insulating bracket 250 and other structures. The fixing structure of the first battery cells 220 in the first receiving cavity is conventional technology in the field and will not be described in detail.

[0070] In this embodiment, the first liquid inlet 231 is located at the edge of the first liquid cooling plate 230, and there are multiple first liquid outlets 232, which are distributed at intervals on the side of the first liquid cooling plate 230 facing the first battery cell 220; there are multiple second liquid inlets 241, which are distributed at intervals on the side of the second liquid cooling plate 240 facing the first battery cell 220, and the second liquid outlets 242 are located at the edge of the second liquid cooling plate 240.

[0071] Furthermore, the second liquid cooling plate 240 is provided with a plurality of first pressure relief holes 243 through it in the vertical direction. The first pressure relief holes 243 are staggered from the second liquid cooling flow channel. The first pressure relief holes 243 correspond one-to-one with the first battery cell 220. The explosion-proof valve of the first battery cell 220 is directly opposite the first pressure relief hole 243, and the explosion-proof valve is sealed to the first pressure relief hole 243.

[0072] In this embodiment, the first pressure relief hole 243 corresponds one-to-one with the first battery cell 220. When a first battery cell 220 experiences thermal runaway, the pressure released by the explosion-proof valve (not shown in the figure) is discharged through the first pressure relief hole 243, which can prevent pressure from accumulating in the first receiving cavity and affecting other first battery cells 220. The explosion-proof valve of the first battery cell 220 is sealed to the first pressure relief hole 243, which can keep the first receiving cavity relatively sealed and prevent coolant from leaking out from the gap between the explosion-proof valve and the first pressure relief hole 243, thus affecting the heat dissipation effect of the first battery cells 220 in the first receiving cavity.

[0073] Specifically, along the first direction, the second liquid cooling plate 240 has multiple rows of second liquid inlets 241 and multiple rows of first pressure relief holes 243, with at least one row of second liquid inlets 241 between each two adjacent rows of first pressure relief holes 243.

[0074] The explosion-proof valve of the first battery cell 220 can be sealed to the first pressure relief hole 243 with sealant.

[0075] like Figures 12 to 15 As shown, the second battery module 300 includes a second frame 310, a second battery cell 320, a third liquid cooling plate 330, and a fourth liquid cooling plate 340. The second frame 310 has open ends in the vertical direction. The third liquid cooling plate 330 is fixed to the side of the second frame 310 facing the bracket 110, and the fourth liquid cooling plate 340 is fixed to the side of the second frame 310 away from the bracket 110. The third liquid cooling plate 330, the second frame 310, and the fourth liquid cooling plate 340 form a second receiving cavity. A second battery cell 320 is located in a second receiving cavity. A third liquid cooling plate 330 has a third liquid cooling channel and a third liquid inlet 331 and a third liquid outlet 332 that are connected to the third liquid cooling channel. A fourth liquid cooling plate 340 has a fourth liquid cooling channel and a fourth liquid inlet 341 and a fourth liquid outlet 342 that are connected to the fourth liquid cooling channel. The second receiving cavity is connected to the third liquid outlet 332 and the fourth liquid inlet 341. A second fixing structure 500 is installed on the outer wall of the second frame 310.

[0076] In this embodiment, the second frame 310 has open ends in the vertical direction, and the open ends are sealed by the third liquid cooling plate 330 and the fourth liquid cooling plate 340, respectively, thereby forming a relatively sealed second receiving cavity, which can achieve sealed reception of the second battery cell 320 in the second receiving cavity; by providing a third liquid cooling channel in the third liquid cooling plate 330 and a third liquid inlet 331 and a third liquid outlet 332 respectively connected to the third liquid cooling channel, the third liquid outlet 332 is connected to the second receiving cavity, and a fourth liquid cooling channel is provided in the fourth liquid cooling plate 340 and a third liquid inlet 331 and a third liquid outlet 332 respectively connected to the fourth liquid cooling channel. The fourth liquid inlet 341 and the fourth liquid outlet 342 are connected to the second receiving cavity. Coolant enters the third liquid cooling channel through the third liquid inlet 331 and flows into the second receiving cavity through the third liquid outlet 332, immersing the second battery cell 320 in the coolant. The coolant directly contacts the second battery cell 320 for heat dissipation. The coolant in the second receiving cavity flows into the fourth liquid cooling channel through the fourth liquid inlet 341 and flows out through the fourth liquid outlet 342. The outflowing coolant can be returned to the third liquid cooling channel via an external circulation cooling drive device. This embodiment utilizes the third liquid cooling plate 330 and the fourth liquid cooling plate 340 to dissipate heat from the second battery cell 320, while simultaneously using the coolant to immerse the second battery cell 320 in the second receiving cavity for heat dissipation. This improves the heat dissipation efficiency of the second battery cell 320, meets actual heat dissipation requirements, and enhances the safety and service life of the second battery cell 320.

[0077] Among them, the two ends of the plurality of second battery cells 320 along their axial direction are respectively fixed in the second receiving cavity by the second insulating bracket 350 and other structures. The fixing structure of the second battery cells 320 in the second receiving cavity is conventional technology in the field and will not be described in detail.

[0078] Furthermore, the fourth liquid cooling plate 340 is provided with multiple second pressure relief holes 343 in the vertical direction. The second pressure relief holes 343 are staggered from the fourth liquid cooling flow channel. The second pressure relief holes 343 correspond one-to-one with the second battery cells 320. The explosion-proof valve of the second battery cell 320 is directly opposite the second pressure relief hole 343, and the explosion-proof valve is sealed to the second pressure relief hole 343.

[0079] In this embodiment, the second pressure relief hole 343 corresponds one-to-one with the second battery cell 320. When a second battery cell 320 experiences thermal runaway, the pressure released by the explosion-proof valve (not shown in the figure) is discharged through the second pressure relief hole 343, which can prevent pressure from accumulating in the second receiving cavity and affecting other second battery cells 320. Furthermore, the explosion-proof valve of the second battery cell 320 is sealed to the second pressure relief hole 343, which can keep the second receiving cavity relatively sealed, preventing coolant from leaking out from the gap between the explosion-proof valve and the second pressure relief hole 343 and affecting the heat dissipation effect of the second battery cells 320 in the second receiving cavity.

[0080] Specifically, along the first direction, the fourth liquid cooling plate 340 has multiple rows of fourth liquid inlets 341 and multiple rows of second pressure relief holes 343, with at least one row of fourth liquid inlets 341 between each two adjacent rows of second pressure relief holes 343.

[0081] The explosion-proof valve of the second battery cell 320 can be sealed to the second pressure relief hole 343 with sealant.

[0082] This embodiment features an independent pressure relief structure designed for the dual-layer module, and this pressure relief structure is relatively independent of the battery cell. For example... Figure 2 As shown, the bracket 110 includes a base plate 111 and a surrounding plate 112 surrounding the base plate 111. The base plate 111 and the surrounding plate 112 form a pressure relief groove 113. The opening of the pressure relief groove 113 faces the first battery module 200. The first battery module 200 is fixed to the surrounding plate 112 by a plurality of first fixing structures 400. The support column 120 is fixed below the surrounding plate 112. The surrounding plate 112 has a first pressure relief channel 1121 that communicates with the pressure relief groove 113. The support column 120 has a second pressure relief channel that extends to the bottom of the box. The first pressure relief channel 1121 communicates with the second pressure relief channel.

[0083] In this embodiment, the base plate 111 and the surrounding plate 112 form a pressure relief groove 113. The opening of the pressure relief groove 113 is directly opposite the first battery module 200. After the first battery module 200 is fixed on the surrounding plate 112, the opening is sealed to form a pressure relief cavity. The pressure relief cavity is connected to the second pressure relief channel provided in the support column 120 through the first pressure relief channel 1121 opened on the surrounding plate 112. When the first battery module 200 experiences thermal runaway, the pressure is released in the pressure relief cavity and diffuses to the pressure relief structure at the bottom of the box through the connected first pressure relief channel 1121 and second pressure relief channel for pressure relief treatment.

[0084] For example, the first pressure relief hole 243 of the second liquid cooling plate 240 is connected to the pressure relief cavity. When a certain first cell 220 in the first battery module 200 experiences thermal runaway, the pressure generated is released into the pressure relief cavity through the first pressure relief hole 243 for pressure relief.

[0085] In some other embodiments, such as Figure 2 As shown, heat-insulating mica 114 is provided on both the side of the base plate 111 facing the first battery module 200 and the side of the base plate 111 facing the second battery module 300, which can further improve the heat insulation effect of the bracket 110 on the first battery module 200 and the second battery module 300.

[0086] Furthermore, the bracket 110 also includes heat-insulating mica 114, with the heat-insulating mica 114 provided on the side of the base plate 111 facing the first battery module 200, and / or, the heat-insulating mica 114 provided on the side of the base plate 111 facing the second battery module 300.

[0087] In this embodiment, the heat-insulating mica 114 is disposed on the side of the base plate 111 facing the first battery module 200 or on the side of the base plate 111 facing the second battery module 300, both of which can achieve the effect of heat insulation and prevent the first battery module 200 and the second battery module 300 from affecting each other in the event of thermal runaway. The heat-insulating mica 114 is fixed to the base plate 111 by adhesive.

[0088] To facilitate the opening of the first pressure relief channel 1121, this embodiment includes a transverse channel and a vertical channel that are interconnected. The transverse channel extends laterally through the enclosure 112, and the vertical channel is connected to the second pressure relief channel. The outer wall of the enclosure 112 is provided with a sealing cap 115 for sealing the outer port (the end away from the pressure relief chamber) of the transverse channel to prevent high-temperature gas generated by thermal runaway from being released to the outside of the bracket 110 and causing heat propagation.

[0089] In this embodiment, the enclosure 112 and the base plate 111 are made of aluminum alloy and are integrally stamped. The first enclosure 210 of the first battery module 200 and the second enclosure 310 of the second battery module 300 are also made of aluminum alloy.

[0090] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A dual-layer modular battery pack, characterized in that, The device includes a housing and a support structure, a first battery module, a second battery module, a first fixing structure, a second fixing structure, and a third fixing structure located within the housing. The support structure includes a bracket and multiple support columns. All the support columns are fixed at intervals below the bracket and adjacent to the outer periphery of the bracket. Each support column is fixedly connected to the housing through a first fixing structure. The first battery module is fixed to the bracket through multiple second fixing structures. The second battery module is located below the bracket and is fixedly connected to the housing through multiple third fixing structures.

2. The dual-layer modular battery pack according to claim 1, characterized in that, Each of the support columns has at least one side facing the second battery module, which contacts the outer wall of the second battery module.

3. The dual-layer modular battery pack according to claim 2, characterized in that, The first fixing structure includes a first fixing seat and a first locking bolt. At least one first fixing seat is provided on the side of the support column that is not in contact with the second battery module. The first fixing seat is provided with a first connecting hole in the vertical direction. A first threaded hole corresponding to the first connecting hole is provided on the housing. The first locking bolt passes through the first connecting hole and is screwed and fixed to the first threaded hole on the housing.

4. The dual-layer modular battery pack according to claim 1, characterized in that, The second fixing structure includes a second fixing seat and a plurality of second locking bolts. The second fixing seat protrudes from the outer side wall of the first battery module. The second fixing seat has at least two second connecting holes extending vertically through it. The bracket has second threaded holes corresponding one-to-one with the second connecting holes. The second locking bolts pass through the second connecting holes and are screwed into the second threaded holes on the bracket for fixation; and / or, The third fixing structure includes a third fixing seat and a plurality of third locking bolts. The third fixing seat protrudes from the outer side wall of the second battery module. The third fixing seat is provided with at least two third connecting holes in the vertical direction. The housing is provided with third threaded holes that correspond one-to-one with the third connecting holes. The third locking bolts pass through the third connecting holes and are screwed and fixed to the third threaded holes in the housing.

5. The dual-layer modular battery pack according to claim 1, characterized in that, The first battery module includes a first frame, a first battery cell, a first liquid cooling plate, and a second liquid cooling plate. The first frame has open ends in the vertical direction. The first liquid cooling plate is fixed to the side of the first frame away from the bracket, and the second liquid cooling plate is fixed to the side of the first frame facing the bracket. The first liquid cooling plate, the first frame, and the second liquid cooling plate form a first receiving cavity. A plurality of the first battery cells are located in the first receiving cavity. The first liquid cooling plate has a first liquid cooling channel and a first liquid inlet and a first liquid outlet communicating with the first liquid cooling channel. The second liquid cooling plate has a second liquid cooling channel and a second liquid inlet and a second liquid outlet communicating with the second liquid cooling channel. The first receiving cavity is communicating with the first liquid outlet and the second liquid inlet. The first fixing structure is installed on the outer wall of the first frame.

6. The dual-layer modular battery pack according to claim 5, characterized in that, The second liquid cooling plate is provided with a plurality of first pressure relief holes in a vertical direction. The first pressure relief holes are staggered from the second liquid cooling flow channel. The first pressure relief holes correspond one-to-one with the first battery cells. The explosion-proof valve of the first battery cell is directly opposite the first pressure relief hole. The explosion-proof valve is sealed to the first pressure relief hole.

7. The dual-layer modular battery pack according to claim 1, characterized in that, The second battery module includes a second frame, a second battery cell, a third liquid cooling plate, and a fourth liquid cooling plate. The second frame has open ends in the vertical direction. The third liquid cooling plate is fixed to the side of the second frame facing the bracket, and the fourth liquid cooling plate is fixed to the side of the second frame away from the bracket. The third liquid cooling plate, the second frame, and the fourth liquid cooling plate form a second receiving cavity. Multiple second battery cells are located in the second receiving cavity. The third liquid cooling plate has a third liquid cooling channel and a third liquid inlet and a third liquid outlet communicating with the third liquid cooling channel. The fourth liquid cooling plate has a fourth liquid cooling channel and a fourth liquid inlet and a fourth liquid outlet communicating with the fourth liquid cooling channel. The second receiving cavity is communicating with the third liquid outlet and the fourth liquid inlet. The second fixing structure is installed on the outer wall of the second frame.

8. The dual-layer modular battery pack according to claim 7, characterized in that, The fourth liquid cooling plate is provided with a plurality of second pressure relief holes in the vertical direction. The second pressure relief holes are staggered from the fourth liquid cooling flow channel. The second pressure relief holes correspond one-to-one with the second battery cells. The explosion-proof valve of the second battery cell is directly opposite the second pressure relief hole. The explosion-proof valve is sealed to the second pressure relief hole.

9. The dual-layer modular battery pack according to any one of claims 1 to 8, characterized in that, The bracket includes a base plate and a surrounding plate around the base plate. The base plate and the surrounding plate form a pressure relief groove. The opening of the pressure relief groove faces the first battery module. The first battery module is fixed to the surrounding plate by a plurality of first fixing structures. The support column is fixed below the surrounding plate. The surrounding plate has a first pressure relief channel communicating with the pressure relief groove. The support column has a second pressure relief channel extending to the bottom of the housing. The first pressure relief channel communicates with the second pressure relief channel.

10. The dual-layer modular battery pack according to claim 9, characterized in that, The bracket also includes heat-insulating mica, which is provided on the side of the base plate facing the first battery module, and / or the heat-insulating mica is provided on the side of the base plate facing the second battery module.

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