Battery module

Abstract

The utility model provides a battery module, relates to the technical field of battery heat dissipation, and aims to solve the technical problem that a current battery module cannot effectively inhibit battery thermal runaway spreading. The battery module comprises a shell, a support assembly, a heat dissipation assembly, a valve and a plurality of battery cells, the support assembly is arranged in a containing cavity of the shell, the support assembly is provided with a plurality of mounting through holes arranged in a honeycomb shape, and each battery cell is arranged in the corresponding mounting through hole; the bracket assembly has a first side surface and a second side surface opposite to each other along the central axis of the mounting through hole; the positive and negative electrodes of the battery cell are exposed on the first side surface and the second side surface through the mounting through hole; the first side face and the second side face are each provided with a heat dissipation assembly, the heat dissipation assemblies are provided with heat dissipation through holes, the heat dissipation through holes communicate with the containing cavity, and a heat dissipation channel is formed in the shell. The valve is arranged on the shell and communicated with the heat dissipation channel. And the heat dissipation channel can quickly discharge high-heat eruptions of the thermal runaway battery core out of the battery, so that heat accumulation is reduced, and the problem of heat spreading of the battery is solved.

Description

Technical Field

[0001] The present application relates to the technical field of battery heat dissipation, and more specifically, to a battery module. Background Art

[0002] Thermal runaway propagation of a lithium battery module refers to the process in which thermal runaway of a single battery cell rapidly spreads to the surrounding batteries. Heat is transferred to the surrounding batteries, thereby triggering heat accumulation, causing the heat to spread inside the lithium battery, leading to thermal runaway of the entire lithium battery.

[0003] Related technologies use liquid cooling pipes to suppress the spread of thermal runaway. For example, pipes are laid around the lithium battery module and filled with coolant. The flow of coolant effectively suppresses the spread of thermal runaway. However, relying on liquid cooling pipes to suppress the spread of thermal runaway requires the addition of multiple structural components, increasing the cost and size of the lithium battery module. Moreover, when thermal runaway actually occurs, the liquid cooling pipes may fail during the process, making them ineffective in suppressing the spread of heat. Utility Model Content

[0004] The purpose of this application is to provide a battery module to solve the technical problem that the current battery module cannot effectively suppress the spread of thermal runaway.

[0005] In order to achieve the above objectives, the embodiments of the present application provide the following technical solutions:

[0006] A first aspect of an embodiment of the present application provides a battery module, which includes: a shell, a bracket assembly, a heat dissipation assembly, a valve and multiple battery cells, the shell having a accommodating cavity, the bracket assembly, the heat dissipation assembly and the multiple battery cells are all arranged in the accommodating cavity, the bracket assembly has multiple mounting through holes, and the multiple mounting through holes are arranged in a honeycomb shape; each of the battery cells is arranged in a corresponding one of the mounting through holes, and the battery cell has positive and negative electrodes opposite to each other along the central axis of the mounting through hole; the bracket assembly has a first side surface and a second side surface opposite to each other along the central axis of the mounting through hole, and the positive and negative electrodes are exposed on the first side surface and the second side surface through the mounting through hole; the first side surface and the second side surface are both provided with the heat dissipation assembly, and the heat dissipation assembly is provided with a heat dissipation through hole, and the heat dissipation through hole is connected with the accommodating cavity to form a heat dissipation channel in the shell; a valve, the valve is arranged on the shell, and the valve is connected with the heat dissipation channel.

[0007] In a possible implementation, the bracket assembly is an assembly made of a highly flame-retardant and heat-insulating material.

[0008] In a possible implementation, the heat dissipation through holes include a plurality of heat dissipation through holes, and the plurality of heat dissipation through holes are arranged in an array.

[0009] In a possible implementation, each of the heat dissipation through holes is provided at an electrode of a corresponding one of the battery cells.

[0010] In one possible implementation, the heat dissipation assembly includes a thermally conductive insulating sheet, a heat sink and a fireproof heat insulating sheet stacked in sequence, the thermally conductive insulating sheet is close to the positive and negative electrodes of the battery core; a first heat dissipation through-hole is provided on the thermally conductive insulating sheet, a second heat dissipation through-hole is provided on the heat sink, and a third heat dissipation through-hole is provided on the fireproof heat insulating sheet; the first heat dissipation through-hole, the second heat dissipation through-hole and the third heat dissipation through-hole are all connected to form the heat dissipation through-hole.

[0011] In one possible implementation, the battery module also includes a first fixed sealing strip and a second fixed sealing strip, and the first fixed sealing strip and the second fixed sealing strip are both arranged between the heat dissipation component and the inner wall surface of the shell, and the first fixed sealing strip and the second fixed sealing strip are both attached to the heat dissipation component; the shell includes a third side surface and a fourth side surface, and the third side surface and the fourth side surface are opposite to each other in a direction perpendicular to the central axis of the mounting through hole; the first fixed sealing strip and the second fixed sealing strip are spaced apart in a direction perpendicular to the central axis of the mounting through hole, and the first fixed sealing strip, the second fixed sealing strip and the accommodating cavity form part of the heat dissipation channel.

[0012] In one possible implementation, the battery module also includes a bus and a protection plate, the bus is connected to the bracket assembly, and the bus is provided on the first side and the second side, the bus is provided with multiple connection ends, each of the connection ends is electrically connected to the electrode of a corresponding battery cell; the protection plate is connected to the third side of the bracket assembly, and the third side intersects with the first side and the second side; the bus is provided with a first adapter end, and the first adapter end is electrically connected to the second adapter end of the protection plate.

[0013] In a possible implementation, each of the connection ends is provided with a first over-temperature fuse structure, wherein the first over-temperature fuse structure comprises a fuse made of a low melting point alloy.

[0014] In one possible implementation, the bus includes a bus body and multiple second over-temperature fuse structures; one end of each of the second over-temperature fuse structures is connected to the bus body, and the other end of each of the second over-temperature fuse structures is connected to a corresponding one of the connection ends; the projected area of ​​the second over-temperature fuse structure on the first side is smaller than the projected area of ​​the connection end on the first side.

[0015] In one possible implementation, the bracket assembly includes a first bracket and a second bracket, the first bracket is provided with a plurality of first mounting through holes, the second bracket is provided with a plurality of second mounting through holes, each of the first mounting through holes is connected to a corresponding second mounting through hole to form the mounting through hole; the first bracket is provided with a first connecting member, the second bracket is provided with a second connecting member, and the first connecting member and the second connecting member are connected.

[0016] In a possible implementation, the valve includes an explosion-proof air relief valve.

[0017] In a possible implementation, potting glue is provided in the gap of the accommodating cavity.

[0018] In a possible implementation, the potting compound is a colloid made of a solid-liquid phase change material, or the potting compound is a colloid made of a microcapsule-containing phase change material.

[0019] Compared with related technologies, the battery module provided by the embodiments of the present application has the following advantages:

[0020] The battery module provided in the embodiments of the present application can solve the problem of battery heat spread at an extremely low cost and without increasing the size.

[0021] Among them, the multiple battery cells of the battery module are respectively arranged in the multiple mounting holes of the bracket assembly, and the multiple mounting holes are arranged in a honeycomb shape to isolate the heat transfer between the battery cells; at the same time, the first side and the second side of the bracket assembly are provided with a heat dissipation assembly, and the heat dissipation assembly is provided with a heat dissipation hole. The heat dissipation assembly can quickly dissipate the heat of the thermal runaway battery cell to a low-temperature area, which is also beneficial to reduce the temperature rise of the battery cell in normal operation; the heat dissipation hole is also connected to the accommodating cavity of the battery module shell to form a heat dissipation channel in the shell, and a valve is provided on the shell, which is connected to the heat dissipation channel. Opening the valve can allow the high-temperature ejecta of the thermal runaway battery cell to be quickly discharged to the outside of the battery through the heat dissipation channel, thereby reducing heat accumulation.

[0022] In addition to the technical problems solved by the embodiments of the present disclosure described above, the technical features that constitute the technical solutions, and the beneficial effects brought about by the technical features of these technical solutions, other technical problems that can be solved by the chassis and mobility scooter provided by the embodiments of the present application, other technical features included in the technical solutions, and the beneficial effects brought about by these technical features will be further described in detail in the specific implementation methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0024] Figure 1 A schematic diagram of the overall structure of the battery module provided in an embodiment of the present application;

[0025] Figure 2 A schematic diagram of the exploded structure of a battery module provided in an embodiment of the present application;

[0026] Figure 3 A schematic structural diagram of a bracket assembly for a battery module provided in an embodiment of the present application;

[0027] Figure 4 A partial cross-sectional view of a battery module provided in an embodiment of the present application;

[0028] Figure 5 for Figure 4 Enlarged view of part A;

[0029] Figure 6 A schematic diagram of the structure of the connection between the battery cell and the bracket assembly of the battery module provided in an embodiment of the present application;

[0030] Figure 7 A schematic diagram of the structure of the connection between the busbar and the bracket assembly of the battery module provided in an embodiment of the present application;

[0031] Figure 8 A schematic diagram of the structure of the connection between the thermally conductive insulating sheet and the bracket assembly of the battery module provided in an embodiment of the present application;

[0032] Figure 9 A schematic diagram of the structure of the heat sink of the battery module provided in an embodiment of the present application;

[0033] Figure 10 A schematic diagram of the structure of the connection between the fireproof and heat-insulating sheet of the battery module and the bracket assembly provided in an embodiment of the present application;

[0034] Figure 11 Schematic diagram of the structure of the busbar of the battery module provided in the embodiment of the present application Figure 1 ;

[0035] Figure 12 Schematic diagram of the structure of the busbar of the battery module provided in the embodiment of the present application Figure 2 .

[0036] Description of reference numerals:

[0037] 100-housing;

[0038] 101-upper shell; 102-aluminum barrel; 103-lower shell; 104-accommodation cavity; 105-heat dissipation channel;

[0039] 1031-valve;

[0040] 200-bracket assembly;

[0041] 201-first bracket; 202-second bracket;

[0042] 2011-first mounting hole;

[0043] 300-battery cells;

[0044] 400-protection board;

[0045] 401-second transfer end;

[0046] 500-busbar;

[0047] 501-busbar body; 502-connection end;

[0048] 5031-first over-temperature fuse structure; 5032-second over-temperature fuse structure;

[0049] 600-heat dissipation component;

[0050] 601-thermal insulation sheet; 602-heat sink; 603-fireproof insulation sheet;

[0051] 6011-first heat dissipation hole; 6021-second heat dissipation hole; 6031-third heat dissipation hole;

[0052] 701-first fixed sealing strip; 702-second fixed sealing strip. DETAILED DESCRIPTION

[0053] Battery modules in related technologies have a problem of being unable to effectively suppress heat spread. The inventors' research has found that this problem arises because related technologies employ liquid cooling pipes around the lithium battery module to suppress the spread of thermal runaway. However, these pipes increase the cost and size of the battery module. Furthermore, these pipes suppress heat accumulation through heat transfer, and are unable to quickly dissipate accumulated heat. This can lead to failure during the spread of thermal runaway, making them ineffective in suppressing heat spread.

[0054] In response to the above technical problems, the battery module provided by the embodiment of the present application is to isolate the heat transfer between the battery cells by respectively arranging multiple battery cells in multiple mounting holes of the bracket assembly, and the multiple mounting holes are arranged in a honeycomb shape, so as to avoid the heat transfer to the surrounding battery cells when a single battery cell is out of control. At the same time, the bracket assembly has a first side surface and a second side surface that are opposite to each other along the central axis of the mounting hole. The positive and negative electrodes of each battery cell are exposed on the first side surface and the second side surface through the mounting hole, and the first side surface and the second side surface are provided with a heat dissipation component. The heat dissipation component can quickly conduct the heat of the thermal runaway battery cell to a low temperature area, which is also beneficial to reduce the temperature rise of the battery cell in normal operation. The heat dissipation component is also provided with a heat dissipation hole, which is also connected to the accommodating cavity of the battery module shell to form a heat dissipation channel in the shell. A valve is also provided on the shell, and the valve is connected to the heat dissipation channel. Opening the valve can allow the high-temperature ejecta of the thermal runaway battery cell to be quickly discharged to the outside of the battery through the heat dissipation channel, reducing heat accumulation.

[0055] With such a configuration, the battery module provided in the embodiment of the present application can solve the problem of battery heat spread at an extremely low cost and without increasing the size.

[0056] In order to make the above-mentioned purposes, features and advantages of the embodiments of the present application more obvious and easy to understand, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0057] To facilitate the description of the embodiments of the present application, the coordinate system in the accompanying drawings is explained, wherein the X-axis direction represents the first direction, which can be the left or right direction of the battery module, and this direction is also the thickness direction of the battery module; the Y-axis direction represents the second direction, which can be the front or rear direction of the battery module, and this direction is also the length direction of the battery module; the Z-axis direction represents the third direction, which can be the up or down direction of the battery module, and this direction is also the thickness direction of the battery module.

[0058] like Figure 1 As shown, the battery module provided in the embodiment of the present application includes: a shell 100, the shell 100 includes an upper shell 101, an aluminum barrel 102 and a lower shell 103 arranged in sequence in the second direction (Y-axis direction), and the shell 100 jointly enclosed by the upper shell 101, the aluminum barrel 102 and the lower shell 103 has a accommodating cavity 104.

[0059] like Figure 2 and Figure 3As shown, the battery module also includes a bracket assembly 200, which is arranged in the accommodating cavity 104 of the shell 100. The bracket assembly 200 includes a first bracket 201 and a second bracket 202. The first bracket 201 and the second bracket 202 have the same structure, and the first bracket 201 and the second bracket 202 are arranged relative to each other in the first direction (X-axis direction); the first bracket 201 is provided with a plurality of first mounting through holes 2011, and the plurality of first mounting through holes 2011 are arranged in a honeycomb shape, and the second bracket 202 is provided with a plurality of second mounting through holes, and the plurality of second mounting through holes are arranged in a honeycomb shape.

[0060] When the first bracket 201 and the second bracket 202 are close to each other and connected, each first mounting through hole is connected to a corresponding second mounting through hole to form a mounting through hole; the mounting through holes include multiple mounting through holes, and the multiple mounting through holes are arranged in a honeycomb shape.

[0061] It should be noted that a first connecting member is provided on the first bracket 201 and a second connecting member is provided on the second bracket 202. When the first bracket 201 and the second bracket 202 are close to each other and connected, the first connecting member and the second connecting member are connected.

[0062] The first connecting member and the second connecting member may be matching threaded members, or the first connecting member and the second connecting member may be matching clamping members.

[0063] like Figure 2 As shown, the battery module also includes a plurality of battery cells 300, and the plurality of battery cells 300 are arranged in the accommodating cavity 104 of the shell 100, and each battery cell 300 is arranged in a corresponding mounting through hole, so as to isolate the heat transfer between the battery cells 300 from the side of the battery cells 300, so as to avoid heat transfer to the surrounding battery cells 300 when a single battery cell 300 is out of control.

[0064] Each battery cell 300 has positive and negative electrodes opposite to each other along the central axis (X-axis direction) of the mounting through hole; the bracket assembly 200 has a first side surface and a second side surface opposite to each other along the central axis (X-axis direction) of the mounting through hole, and the positive and negative electrodes are exposed on the first side surface and the second side surface through the mounting through hole.

[0065] Among them, each battery cell 300 includes a positive electrode and a negative electrode opposite to each other along the X-axis direction, and the positive electrodes of half of the battery cells 300 in the multiple battery cells 300 are exposed on the first side through the mounting through holes, and the positive electrodes of the other half of the battery cells 300 are exposed on the second side through the mounting through holes; at the same time, the negative electrodes of half of the battery cells 300 in the multiple battery cells 300 are exposed on the second side through the mounting through holes, and the negative electrodes of the other half of the battery cells 300 are exposed on the first side through the mounting through holes.

[0066] like Figure 2As shown, the battery module also includes a heat dissipation assembly 600, which is provided on both the first and second side surfaces. The heat dissipation assembly 600 provided on the first side surface contacts the positive electrodes of half of the battery cells 300, and also contacts the negative electrodes of the other half of the battery cells 300. The heat dissipation assembly 600 provided on the second side surface contacts the negative electrodes of half of the battery cells 300, and also contacts the positive electrodes of the other half of the battery cells 300. The heat dissipation assembly 600 provided on the first side surface can dissipate heat from the positive and negative electrodes of the battery cells 300 exposed on the first side surface, and the heat dissipation assembly 600 provided on the second side surface can dissipate heat from the positive and negative electrodes of the battery cells 300 exposed on the second side surface. This allows the heat of the thermal runaway battery cells to be quickly dissipated to a low-temperature area, which also helps reduce the temperature rise of the battery cells in normal operation.

[0067] Alternatively, each battery cell 300 includes a positive electrode and a negative electrode opposite to each other along the X-axis direction, the positive electrodes of multiple battery cells 300 are exposed on the first side through the mounting through holes, and the negative electrodes of multiple battery cells 300 are exposed on the second side through the mounting through holes.

[0068] Both the first and second side surfaces are provided with heat dissipation assemblies 600. The heat dissipation assembly 600 provided on the first side surface contacts the positive electrodes of the multiple battery cells 300, while the heat dissipation assembly 600 provided on the second side surface contacts the negative electrodes of the multiple battery cells 300. The heat dissipation assembly 600 provided on the first side surface can dissipate heat from the positive electrodes of the battery cells 300 exposed on the first side surface, while the heat dissipation assembly 600 provided on the second side surface can dissipate heat from the negative electrodes of the battery cells 300 exposed on the second side surface. This allows the heat of the thermally runaway battery cells to be quickly transferred to a low-temperature area, which also helps to reduce the temperature rise of the battery cells in normal operation.

[0069] like Figure 4 and Figure 5 As shown, in the embodiment of the present application, a heat dissipation through hole is further provided on the heat dissipation assembly 600 , and the heat dissipation through hole is communicated with the accommodating cavity 104 to form a heat dissipation channel 105 in the shell.

[0070] The battery module further includes a valve 1031 , which is disposed on the lower shell 103 of the shell 100 . The valve 1031 is in communication with the heat dissipation channel 105 .

[0071] Among them, the specific path of the heat dissipation channel 105 is the battery cell 300 → heat dissipation component 600 → accommodating cavity 104 → valve 1031 → outside of the battery module. Opening the valve can allow the high-temperature ejecta of the thermal runaway battery cell to be quickly discharged to the outside of the battery module through the heat dissipation channel 105, reducing heat accumulation.

[0072] In the embodiment of the present application, the valve 1031 may be an explosion-proof air relief valve.

[0073] In the embodiment of the present application, the bracket assembly 200 is a component made of a highly flame-retardant thermal insulation material. The highly flame-retardant thermal insulation material can prevent the heat of the runaway battery cell from diffusing to the surrounding area, and can also absorb the heat released by the thermal runaway battery cell, that is, it has both thermal insulation and heat absorption functions.

[0074] Among them, the thermal conductivity of high-flame retardant thermal insulation materials is low, so that the heat of the out-of-control battery cell cannot be transferred to the adjacent battery cell in a short time. The temperature of the adjacent battery cells rises slowly, which can slow down the spread of heat; high-flame retardant thermal insulation materials are resistant to high temperatures, preventing them from decomposing at high temperatures and losing their heat-insulating ability; high-flame retardant thermal insulation materials have low density, which can reduce the impact on the volume energy and mass energy of the battery module.

[0075] Taking the cylindrical battery cell provided in the embodiment of the present application as an example, the highly flame-retardant thermal insulation material is located on the side of the battery cell 300, that is, the highly flame-retardant thermal insulation material is located between the runaway battery cell and the non-runaway battery cell to hinder or block the spread of thermal runaway.

[0076] In the embodiment of the present application, the highly flame-retardant thermal insulation material can be composed of polypropylene (PP) + 30% glass fiber (GF); wherein, polypropylene is a semi-crystalline thermoplastic plastic with high impact resistance, strong mechanical properties, and resistance to corrosion by various organic solvents and acids and alkalis; glass fiber is an inorganic non-metallic material with excellent performance, good insulation, strong heat resistance, good corrosion resistance, and high mechanical strength.

[0077] In the embodiment of the present application, the heat dissipation holes may include multiple heat dissipation holes arranged in an array, and the spacing between any two adjacent heat dissipation holes is the same. The multiple heat dissipation holes with the same spacing can dissipate heat quickly and evenly.

[0078] In the embodiment of the present application, each heat dissipation through hole is arranged at the electrode of a corresponding battery cell 300. At this time, the specific path of the heat dissipation channel 105 is the positive and negative electrodes of the battery cell 300 → the heat dissipation component 600 → the accommodating cavity 104 → the valve 1031 → the outside of the battery module, so that the heat generated by the battery cell 300 can be quickly dissipated.

[0079] like Figure 2 、 Figure 8 、 Figure 9 and Figure 10 As shown, in the embodiment of the present application, the heat dissipation assembly 600 includes a thermally conductive insulating sheet 601, a heat sink 602 and a fireproof heat-insulating sheet 603 stacked in sequence, the thermally conductive insulating sheet 601 is close to the positive and negative electrodes of the battery cell 300 and is in contact with the positive and negative electrodes of the battery cell 300; the heat sink 602 can be bonded to the thermally conductive insulating sheet 601, and the fireproof heat-insulating sheet 603 can be bonded to the heat sink 602.

[0080] At this time, the specific path of the heat dissipation channel 105 is the positive and negative electrodes of the battery cell 300 → thermal conductive insulation sheet 601 → heat sink 602 → fireproof insulation sheet 603 → accommodating cavity 104 → valve 1031 → outside of the battery module, so that the heat generated by the battery cell 300 can be quickly dissipated.

[0081] The thermally conductive insulating sheet 601 can be a thermally conductive silicone gasket, which can complete the heat transfer between the heating part and the heat dissipation part, and also provide insulation, shock absorption, and sealing. The heat sink 602 can be an aluminum heat sink, which has good heat dissipation and good resistance to oxidative corrosion. The fireproof heat insulation sheet 603 can be an aerogel heat insulation sheet, which can effectively reduce the impact of a single battery cell out of control on the entire battery module, delay the internal temperature rise of the battery module, prolong the time of overall out of control of the battery module, and reduce the risk of fire and explosion of the battery module.

[0082] The thermal insulation sheet 601 is provided with a first heat dissipation through hole 6011, the heat dissipation sheet 602 is provided with a second heat dissipation through hole 6021, and the fireproof heat insulation sheet 603 is provided with a third heat dissipation through hole 6031; the first heat dissipation through hole 6011, the second heat dissipation through hole 6021, and the third heat dissipation through hole 6031 are all connected.

[0083] At this time, the specific path of the heat dissipation channel 105 can be the positive and negative electrodes of the battery cell 300 → the first heat dissipation hole 6011 → the second heat dissipation hole 6021 → the third heat dissipation hole 6031 → the accommodating cavity 104 → the valve 1031 → the outside of the battery module, so that the heat generated by the battery cell 300 can be quickly dissipated.

[0084] like Figure 4 and Figure 5 As shown, in the embodiment of the present application, the first heat dissipation through hole 6011, the second heat dissipation through hole 6021, and the third heat dissipation through hole 6031 are connected to form a heat dissipation through hole, that is, the central axes of the first heat dissipation through hole 6011, the second heat dissipation through hole 6021, and the third heat dissipation through hole 6031 are the same central axis to accelerate the dissipation of heat.

[0085] refer to Figure 2 and Figure 10 In the embodiment of the present application, the battery module further includes a first fixed sealing strip 701 and a second fixed sealing strip 702. The first fixed sealing strip 701 and the second fixed sealing strip 702 are both disposed in the accommodating cavity 104 of the housing 100 and are both disposed between the heat dissipation assembly 600 and the inner wall surface of the housing 100. The first fixed sealing strip 701 and the second fixed sealing strip 702 are both disposed between the fireproof and heat-insulating sheet 603 and the inner wall surface of the housing 100. The first fixed sealing strip 701 and the second fixed sealing strip 702 can secure the heat dissipation assembly 600.

[0086] The shell 100 includes a third side and a fourth side, which are opposite to each other in a direction perpendicular to the central axis of the mounting hole (Z-axis direction), the third side intersects with both the first side and the second side, and the fourth side intersects with both the first side and the second side.

[0087] The first and second fixed sealing strips 701, 702 are spaced apart in a direction perpendicular to the central axis of the mounting hole (the Z-axis), with the first fixed sealing strip 701 close to the third side surface and the second fixed sealing strip 702 close to the fourth side surface. The first and second fixed sealing strips 701, 702, and the accommodating cavity 104 form a partial heat dissipation channel. The first and second fixed sealing strips 701, 702 provide a sealing function.

[0088] refer to Figure 2 、 Figure 6 and Figure 7 In this embodiment of the present application, the battery module further includes a protective plate 400, which is disposed within the housing cavity 104 of the housing 100 and connected to the third side surface of the bracket assembly 200. The protective plate 400 protects the battery and balances energy. The bracket assembly 200 not only isolates the battery cells 300 from heat transfer from one side to the other, preventing heat transfer to surrounding cells 300 in the event of a single cell 300 becoming uncontrolled, but also prevents heat from directly impacting the protective plate 400.

[0089] The battery module further includes a busbar 500 , which is disposed in the accommodating cavity 104 of the shell 100 . The busbar 500 is connected to the bracket assembly 200 , and the busbar 500 is disposed on both the first side and the second side of the bracket assembly 200 .

[0090] The busbar 500 is provided with multiple connection terminals 502, each connection terminal 502 is electrically connected to the electrode of a corresponding battery cell 300; the busbar 500 is also provided with a first adapter terminal 504, the first adapter terminal 504 is electrically connected to the second adapter terminal 401 provided on the protection plate 400, so that the busbar 500 is electrically connected to the battery cell 300 and the protection plate 400.

[0091] In the embodiment of the present application, an over-temperature fuse structure is also provided on the bus 500, which can promptly disconnect the electrical connection of the thermal runaway battery cell to prevent current backflow from aggravating heat generation, thereby avoiding aggravating the thermal runaway of the battery cell.

[0092] refer to Figure 11In the embodiment of the present application, a plurality of connection terminals 502 are provided on the busbar 500, each connection terminal 502 is electrically connected to the electrode of a corresponding battery cell 300, and a first over-temperature fuse structure 5031 is provided on each connection terminal 502. The first over-temperature fuse structure 5031 includes a fuse made of a low-melting-point alloy. When an abnormally large current passes through, it quickly generates heat and melts, thereby promptly disconnecting the electrical connection of the thermal runaway battery cell.

[0093] refer to Figure 12 In an embodiment of the present application, the busbar 500 includes a busbar body 501, multiple connection terminals 502 and multiple second over-temperature fuse structures 5032, one end of each second over-temperature fuse structure 5032 is connected to the busbar body 501, and the other end of each second over-temperature fuse structure 5032 is connected to a corresponding connection terminal 502, and each connection terminal 502 is electrically connected to an electrode of a corresponding battery cell 300; that is, the second over-temperature fuse structure 5032 is arranged between the connection terminal 502 and the battery cell 300.

[0094] The projected area of ​​the second overtemperature fuse structure 5032 on the first side is smaller than the projected area of ​​the connection end 502 on the first side. That is to say, by narrowing the local overcurrent area (the second overtemperature fuse structure 5032), when an abnormally large current passes through, heat is quickly generated and the temperature rises and the fuse is melted, thereby promptly disconnecting the electrical connection of the thermal runaway battery cell.

[0095] In the embodiment of the present application, potting glue is provided in the gap of the accommodating cavity 104 .

[0096] Among them, the battery cell 300 is assembled in the bracket assembly 200, and the heat dissipation assembly 600 is arranged on the side of the bracket assembly 200 and then assembled in the accommodating cavity 104. At this time, the accommodating cavity 104 still has an unfilled gap, and potting glue is set in the gap to increase the heat dissipation area and further improve the heat dissipation effect.

[0097] In the embodiment of the present application, the potting glue may be a colloid made of a solid-liquid phase change material.

[0098] Phase change material is a latent heat storage material that changes its state while maintaining constant temperature and can provide latent heat, using the phase change process of the material to store and release heat.

[0099] Solid-liquid phase change materials undergo a phase change from solid to liquid at high temperatures. The phase change materials absorb and store a large amount of latent heat. When the phase change materials cool down, the stored heat must be dissipated into the environment within a certain temperature range, undergoing a reverse phase change from liquid to solid.

[0100] Therefore, solid-liquid phase change materials have a wider temperature platform. Although the temperature remains unchanged, the latent heat absorbed or released is large.

[0101] In the embodiments of the present application, the potting compound can also be a colloid made of a microcapsule-containing phase change material. The microcapsule-containing phase change material encapsulates the phase change material within a shell, which not only effectively prevents leakage and improves its stability, but also significantly increases the contact area between the phase change material and the base material, thereby improving heat conduction.

[0102] It should be noted that the embodiment of the present application also provides another battery module, which includes: a shell having a accommodating cavity.

[0103] The above-mentioned battery module also includes a bracket assembly, a bus, a protective plate and multiple battery cells. The bracket assembly has multiple mounting through holes, and the multiple mounting through holes are arranged in a honeycomb shape; each battery cell is arranged in a corresponding mounting through hole, and the battery cell has positive and negative electrodes opposite to each other along the central axis of the mounting through hole; the bracket assembly has a first side surface and a second side surface opposite to each other along the central axis of the mounting through hole, and the positive and negative electrodes are exposed on the first side surface and the second side surface through the mounting through hole; the bus bar is connected to the bracket assembly, and the first side surface and the second side surface of the bracket assembly are both provided with a bus bar.

[0104] The protection plate is connected to the third side of the bracket assembly, and the third side intersects with the first side and the second side; a plurality of connections are provided on the bus, and each connection is electrically connected to the electrode of a corresponding battery cell; a first adapter is also provided on the bus, and the first adapter end is electrically connected to the second adapter provided on the protection plate, so that the bus is electrically connected to the electricity and protection.

[0105] The bracket assembly, which houses the busbar, protective plate, and multiple battery cells, is placed in the housing's cavity. Glue is then poured into the cavity, acting as a heat sink. This allows heat from the uncontrolled battery cells to be dissipated to a cooler area, helping to reduce the temperature rise during normal operation. Gluing the cavity also isolates the battery from oxygen, reducing the high temperatures generated by burning cells and providing a certain degree of waterproofing.

[0106] The various embodiments or implementation methods in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments, and the same or similar parts between the various embodiments can be referenced to each other.

[0107] It should be noted that phrases such as "one embodiment," "an embodiment," "exemplary embodiments," and "some embodiments" in this specification may indicate embodiments that may include a particular feature, structure, or characteristic, but not every embodiment necessarily includes that particular feature, structure, or characteristic. Furthermore, such phrases do not necessarily refer to the same embodiment. Furthermore, when a particular feature, structure, or characteristic is described in conjunction with an embodiment, it is within the knowledge of those skilled in the art to implement such feature, structure, or characteristic in conjunction with other embodiments, whether explicitly described or not.

[0108] Generally speaking, terms should be understood, at least in part, based on the context in which they are used. For example, as used herein, the term "one or more" can be used to describe any feature, structure, or characteristic in the singular sense, or can be used to describe a combination of features, structures, or characteristics in the plural sense, depending at least in part on the context. Similarly, terms such as "a" or "an" can also be understood to convey either singular or plural usage, depending at least in part on the context.

[0109] It should be readily understood that “on,” “above,” and “over” in this disclosure should be interpreted in the broadest manner, such that “on” means not only “directly on something,” but also includes “on something” with intervening features or layers therebetween, and “above” or “over” includes not only the meaning of “above” or “over,” but also includes “above” or “over” with no intervening features or layers therebetween (i.e., directly on something).

[0110] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery module, characterized in that: include: A housing, a bracket assembly, a heat dissipation assembly, a valve, and a plurality of battery cells, wherein the housing has a receiving cavity, and the bracket assembly, the heat dissipation assembly, and the plurality of battery cells are all disposed in the receiving cavity; The bracket assembly has a plurality of mounting through holes, and the plurality of mounting through holes are arranged in a honeycomb shape; Each of the battery cells is disposed in a corresponding one of the mounting through holes, and the battery cell has positive and negative electrodes that are opposite to each other along a central axis of the mounting through hole; The bracket assembly has a first side surface and a second side surface opposite to each other along the central axis of the mounting through hole, and the positive and negative electrodes are exposed on the first side surface and the second side surface through the mounting through hole; The heat dissipation assembly is provided on both the first side surface and the second side surface. The heat dissipation assembly is provided with a heat dissipation through hole, and the heat dissipation through hole is communicated with the accommodating cavity to form a heat dissipation channel in the housing; A valve is provided on the housing and is communicated with the heat dissipation channel.

2. The battery module according to claim 1, wherein: The bracket assembly is made of highly flame-retardant and heat-insulating materials.

3. The battery module according to claim 1, wherein: The heat dissipation through holes include a plurality of heat dissipation through holes, and the plurality of heat dissipation through holes are arranged in an array.

4. The battery module according to claim 3, characterized in that: Each of the heat dissipation through holes is arranged at an electrode of a corresponding battery cell.

5. The battery module according to claim 1, wherein: The heat dissipation assembly includes a heat-conducting insulating sheet, a heat dissipating sheet, and a fireproof heat-insulating sheet stacked in sequence, wherein the heat-conducting insulating sheet is close to the positive and negative electrodes of the battery cell; The heat-conducting insulating sheet is provided with a first heat dissipation through-hole, the heat dissipating sheet is provided with a second heat dissipation through-hole, and the fireproof heat-insulating sheet is provided with a third heat dissipation through-hole; The first heat dissipation through hole, the second heat dissipation through hole, and the third heat dissipation through hole are all connected to form the heat dissipation through hole.

6. The battery module according to claim 1, characterized in that: The battery module further includes a first fixed sealing strip and a second fixed sealing strip, wherein the first fixed sealing strip and the second fixed sealing strip are both arranged between the heat dissipation component and the inner wall surface of the shell, and the first fixed sealing strip and the second fixed sealing strip are both attached to the heat dissipation component; The housing includes a third side surface and a fourth side surface, wherein the third side surface and the fourth side surface are opposite to each other along a direction perpendicular to the central axis of the mounting through hole; The first fixed sealing strip and the second fixed sealing strip are spaced apart in a direction perpendicular to the central axis of the mounting through hole. The first fixed sealing strip, the second fixed sealing strip and the accommodating cavity form a portion of the heat dissipation channel.

7. The battery module according to claim 6, characterized in that: The battery module further includes a busbar and a protection plate, the busbar being connected to the bracket assembly, and the busbar being provided on both the first side surface and the second side surface, the busbar being provided with a plurality of connection terminals, each of the connection terminals being electrically connected to an electrode of a corresponding battery cell; The protection plate is connected to a third side surface of the bracket assembly, and the third side surface intersects both the first side surface and the second side surface; The busbar is provided with a first adapter end, and the first adapter end is electrically connected to the second adapter end of the protection plate.

8. The battery module according to claim 7, characterized in that: A first over-temperature fuse structure is provided on each of the connection ends, and the first over-temperature fuse structure includes a fuse made of a low-melting-point alloy.

9. The battery module according to claim 7, characterized in that: The busbar includes a busbar body and a plurality of second over-temperature fuse structures; One end of each of the second over-temperature fuse structures is connected to the busbar body, and the other end of each of the second over-temperature fuse structures is connected to a corresponding one of the connection ends; A projected area of ​​the second over-temperature fuse structure on the first side surface is smaller than a projected area of ​​the connecting end on the first side surface.

10. The battery module according to claim 1, wherein: The bracket assembly includes a first bracket and a second bracket, the first bracket is provided with a plurality of first mounting through holes, the second bracket is provided with a plurality of second mounting through holes, each of the first mounting through holes is connected to a corresponding second mounting through hole to form the mounting through holes; the first bracket is provided with a first connecting member, the second bracket is provided with a second connecting member, and the first connecting member and the second connecting member are connected.

11. The battery module according to claim 1, wherein: The valve includes an explosion-proof air relief valve.

12. The battery module according to claim 1, wherein: A potting compound is provided in the gap of the accommodating cavity.

13. The battery module according to claim 12, characterized in that: The potting glue is a colloid made of a solid-liquid phase change material, or the potting glue is a colloid made of a phase change material containing microcapsules.

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