Battery module

Abstract

The utility model provides a battery module, relates to the technical field of waterproof heat dissipation of batteries, and aims to solve the technical problems that a current battery module cannot restrain heat spreading of the batteries and is poor in waterproof effect. The battery module comprises a support assembly, a waterproof sleeve, a shell and a plurality of battery cells, the support assembly is provided with a plurality of mounting through holes arranged in a honeycomb shape, the battery cells are arranged in the mounting through holes, the support assembly is arranged in a first containing cavity of the waterproof sleeve, the waterproof sleeve is further provided with a wire outlet, and connecting wires of positive and negative electrodes of the battery cells extend out through the wire outlet. The wire outlet is provided with a sealant; a cooling substance is also arranged in the first accommodating cavity, and the cooling substance is immersed around the plurality of battery cells; the waterproof sleeve is arranged in the second containing cavity of the shell, and pouring sealant is arranged between the outer wall of the waterproof sleeve and the inner wall of the shell. The waterproof sleeve and the shell form a multi-layer waterproof structure, so that the waterproof effect of the battery is improved; and the immersed cooling substance can effectively solve the problem of heat spreading of the battery on the premise of not increasing the size.

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 cooling water. The flow of cooling water can effectively suppress 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. Furthermore, the batteries in related technologies are poorly waterproof, and cooling water entering the battery can cause electrical performance degradation or failure, and even lead to thermal damage. Utility Model Content

[0004] The purpose of this application is to provide a battery module to solve the technical problems that the current battery module cannot effectively suppress the spread of thermal runaway and has poor waterproof effect.

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

[0006] According to a first aspect of an embodiment of the present application, there is provided a battery module, comprising: a plurality of battery cells; a bracket assembly, the bracket assembly having a plurality of mounting through holes arranged in a honeycomb shape, each of the battery cells being arranged in a corresponding one of the mounting through holes; a waterproof sleeve, the waterproof sleeve having a first accommodating cavity, the bracket assembly being arranged in the first accommodating cavity, the waterproof sleeve also having an outlet, the connecting wires of the positive and negative electrodes of the battery cells extending through the outlet, the outlet being provided with sealant; a cooling substance, the cooling substance being arranged in the first accommodating cavity and immersed around the plurality of battery cells; a shell, the shell having a second accommodating cavity, the waterproof sleeve being arranged in the second accommodating cavity, and a potting glue being further provided between the outer wall of the waterproof sleeve and the inner wall of the shell.

[0007] In a possible implementation, the cooling substance includes cooling liquid or phase change material.

[0008] In one possible implementation, the waterproof sleeve includes: a sleeve body and a first waterproof foam, the sleeve body has a first opening, the bracket assembly and the cooling material are both arranged in the first accommodating cavity from the first opening; the first waterproof foam is connected to the first opening, and the first waterproof foam is provided with a first outlet, and the connecting wires of the positive and negative electrodes extend through the first outlet; the first outlet is provided with sealant.

[0009] In a possible implementation, the waterproof sleeve includes: a sleeve body, a first waterproof foam and a second waterproof foam, the sleeve body having a sleeve central axis, the sleeve central axis being perpendicular to the hole central axis of the mounting through hole, the sleeve body having a first opening and a second opening opposite to each other along the sleeve central axis; the first waterproof foam is connected to the first opening, the second waterproof foam is connected to the second opening, the bracket assembly and the cooling material are both arranged in the first accommodating cavity from the first opening, or the bracket assembly and the cooling material are both arranged in the first accommodating cavity from the second opening; a first wire outlet is provided on the first waterproof foam, a second wire outlet is provided on the second waterproof foam, the connecting wires of the positive and negative electrodes extend through the first wire outlet and the second wire outlet, and the first wire outlet and the second wire outlet are both provided with sealant.

[0010] In one possible implementation, the shell includes an aluminum barrel, an upper shell and a lower shell, the aluminum barrel has a barrel central axis, the barrel central axis is perpendicular to the hole central axis of the mounting through hole, the aluminum barrel has a first mounting port and a second mounting port relative to each other along the barrel central axis, the upper shell is connected to the first mounting port, and the lower shell is connected to the second mounting port; the battery module also includes a first seal and a second seal, the first seal is arranged on the inner side surface of the upper shell, and the second seal is arranged on the inner side surface of the lower shell, when the upper shell is connected to the first mounting port and the lower shell is connected to the second mounting port, the first seal, the second seal and the aluminum barrel enclose the second accommodating cavity.

[0011] In a possible implementation, a circle of sealant is provided between the first sealing member and the inner side surface of the upper shell, and a circle of sealant is provided between the second sealing member and the inner side surface of the lower shell.

[0012] In one possible implementation, 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 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.

[0013] 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.

[0014] In a possible implementation, 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.

[0015] 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.

[0016] In a possible implementation, the waterproof sleeve is a sleeve made of heat shrink packaging material.

[0017] Compared with related technologies, the battery module provided by the embodiments of the present application has the following advantages:

[0018] In the battery module provided in the embodiment of the present application, multiple battery cells are assembled on a bracket assembly, and the bracket assembly is arranged in a waterproof sleeve. The waterproof sleeve is the first layer of waterproofing for the multiple battery cells; the waterproof sleeve is further arranged in a shell, and a potting glue is also provided between the outer wall of the waterproof sleeve and the inner wall of the shell. The potting glue is the second layer of waterproofing for the multiple battery cells; the shell is the third layer of waterproofing for the multiple battery cells; therefore, the battery module provided in the embodiment of the present application has multi-layer waterproofing, and the multi-layer waterproofing can adapt to a variety of battery usage scenarios, can prevent the battery's charged components from contacting water, and greatly reduce the risk of battery failure.

[0019] At the same time, 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.

[0020] Among them, the immersion cooling material inside the waterproof casing can completely wrap the battery cell. When a single battery cell suffers thermal runaway, the immersion cooling material can prevent heat from impacting other battery cells, and can quickly absorb the heat of the runaway battery cell, lowering the temperature of the runaway battery cell and solving the problem of battery heat spread.

[0021] 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

[0022] 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.

[0023] Figure 1 A schematic diagram of the overall structure of the battery module provided in an embodiment of the present application;

[0024] Figure 2 Schematic diagram of the explosion structure of the battery module provided in the embodiment of the present application Figure 1 ;

[0025] Figure 3 Schematic diagram of the explosion structure of the battery module provided in the embodiment of the present application Figure 2 ;

[0026] Figure 4 Schematic diagram of the explosion structure of the battery module provided in the embodiment of the present application Figure 3 ;

[0027] Figure 5 A partial cross-sectional view of a battery module provided in an embodiment of the present application;

[0028] Figure 6 for Figure 5 Enlarged view of part A;

[0029] Figure 7 for Figure 6 Enlarged view of part B;

[0030] Figure 8 A schematic diagram of the structure of the connection between the battery cell and the bracket assembly provided in an embodiment of the present application;

[0031] Figure 9 A schematic diagram of the structure of the busbar and the bracket assembly connected to each other according to an embodiment of the present application;

[0032] Figure 10 Schematic diagram of the structure of the busbar of the battery module provided in the embodiment of the present application Figure 1 ;

[0033] Figure 11 Schematic diagram of the structure of the busbar of the battery module provided in the embodiment of the present application Figure 2 .

[0034] Description of reference numerals:

[0035] 100-housing;

[0036] 101-upper shell; 102-aluminum barrel; 103-lower shell; 105-connector; 106-second accommodating chamber;

[0037] 1041-first sealing member; 1042-second sealing member;

[0038] 200-bracket assembly;

[0039] 201-first bracket; 202-second bracket;

[0040] 2011-first mounting hole;

[0041] 300-battery cells;

[0042] 400-protection board;

[0043] 401-second transfer end;

[0044] 500-busbar;

[0045] 501-busbar body; 502-connection end;

[0046] 5031-first over-temperature fuse structure; 5032-second over-temperature fuse structure;

[0047] 600-waterproof casing;

[0048] 601-sleeve body; 602-first waterproof foam; 603-second waterproof foam; 604-first accommodating cavity;

[0049] 6021-first outlet; 6031-second outlet;

[0050] 700-Sealant. DETAILED DESCRIPTION

[0051] Battery modules in related technologies suffer from an inability to effectively suppress heat spread and poor waterproofing. The inventors discovered 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, potentially failing during the spread of thermal runaway and failing to effectively suppress heat spread. Furthermore, for batteries with poor waterproofing, the entry of cooling water into the battery can lead to a decrease in electrical performance or failure, and can even cause heat loss.

[0052] In response to the above technical problems, the battery module provided in the embodiment of the present application respectively arranges multiple battery cells in multiple mounting holes of the bracket assembly; at the same time, the bracket assembly is arranged in a waterproof sleeve, and the waterproof sleeve serves as the first layer of waterproof structure for the multiple battery cells; the waterproof sleeve is further arranged in a shell, and a potting glue is arranged between the outer wall of the waterproof sleeve and the inner wall of the shell, and the potting glue serves as the second layer of waterproof structure for the multiple battery cells; the shell serves as the third layer of waterproof structure for the multiple battery cells; so that the battery module provided in the embodiment of the present application has multi-layer waterproofing, and the multi-layer waterproofing can adapt to a variety of battery usage scenarios and can prevent the battery's charged components from contacting water.

[0053] Cooling material is also provided inside the waterproof casing. The immersion cooling material can completely wrap the battery cell. When a single battery cell suffers thermal runaway, the immersion cooling material can prevent heat from impacting other battery cells and can quickly absorb the heat of the runaway battery cell, thereby lowering the temperature of the runaway battery cell, solving the problem of battery heat spread and reducing heat accumulation.

[0054] Therefore, 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. It also has a multi-layer waterproof structure, which improves the waterproof effect of the battery module and greatly reduces the risk of battery failure.

[0055] 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.

[0056] 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.

[0057] 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 second accommodating cavity 106.

[0058] like Figure 2 、 Figure 3 and Figure 8 As shown, the battery module also includes a bracket assembly 200, which 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.

[0059] 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.

[0060] 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.

[0061] 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.

[0062] like Figure 2 and Figure 3As shown, the battery module also includes a plurality of battery cells 300, each battery cell 300 is arranged in a corresponding mounting through hole, and 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.

[0063] 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.

[0064] like Figure 2 、 Figure 3 and Figure 4 As shown, in the embodiment of the present application, the battery module also includes a waterproof sleeve 600, which has a first accommodating cavity 604. The bracket assembly 200 is arranged in the first accommodating cavity 604, and the waterproof sleeve 600 also has an outlet. The connecting wires of the positive and negative electrodes of the battery cell 300 extend through the outlet. The outlet is provided with a sealant, which is used to seal the outlet, so that the first accommodating cavity 604 is a closed chamber, thereby realizing the first layer of waterproofing for the battery cell 300.

[0065] Among them, the battery module also includes a cooling material, which is arranged in the first accommodating cavity 604, and the cooling material is immersed around the multiple battery cells 300. The cooling material can completely wrap the battery cells 300. When a single battery cell suffers from thermal runaway, the immersed cooling material can prevent heat from impacting other battery cells, and can quickly absorb the heat of the runaway battery cell, allowing the temperature of the runaway battery cell to drop, thereby solving the battery heat spread phenomenon and reducing heat accumulation.

[0066] In an embodiment of the present application, the cooling material may include a coolant. The coolant has a high specific heat capacity and a moderate thermal conductivity. When a single battery cell experiences thermal runaway, the coolant can not only prevent the heat from quickly impacting other battery cells, but also quickly absorb the heat of the runaway battery cell and slowly transfer it to a low-temperature area, thereby lowering the temperature of the runaway battery cell. This is also beneficial for reducing the temperature rise of the normally operating battery cell, and can also isolate oxygen, reduce the high temperature generated by the combustion of the battery cell, and ultimately solve the problem of battery heat spread.

[0067] In the embodiment of the present application, the cooling material may also include a phase change material.

[0068] Phase change material is a latent heat storage material. During the phase change process, the phase change material can maintain a constant temperature and absorb a large amount of heat. It can prevent the heat of the thermal runaway battery cell from impacting other battery cells and cool down the thermal runaway battery cell by absorbing heat. It can also play a role in heat distribution during the normal operation of the battery, and ultimately achieve no heat spread in the battery.

[0069] Cooling materials can also include solid-liquid phase change materials (PCMs). At high temperatures, these materials undergo a phase transition from solid to liquid, absorbing and storing large amounts of latent heat. As the PCM cools, this stored heat must be dissipated into the environment within a certain temperature range, undergoing a reverse phase transition from liquid to solid. Therefore, PCMs have a wide temperature range, and while the temperature remains constant, they absorb or release a significant amount of latent heat.

[0070] In an embodiment of the present application, the cooling material may also include a microcapsule-containing phase change material. The microcapsule-containing phase change material encapsulates the phase change material in a shell, which can not only effectively prevent leakage problems and improve its stability, but also significantly increase the contact area between the phase change material and the matrix material, thereby improving heat conduction.

[0071] In the embodiment of the present application, the waterproof sleeve 600 may include: a sleeve body 601 and a first waterproof foam 602 . The sleeve body 601 has a first opening. The first waterproof foam 602 is connected to the first opening and seals the sleeve body 601 to form a first accommodating cavity 604 .

[0072] After the bracket assembly 200 is disposed in the first accommodating cavity 604 from the first opening, the first waterproof foam 602 is connected to the first opening to seal the sleeve body 601. The first waterproof foam 602 can be bonded to the first opening.

[0073] The first waterproof foam 602 is also provided with a first wire outlet 6021, through which the connecting wires of the positive and negative electrodes of the battery cell 300 extend. The first wire outlet 6021 is provided with sealant, which is used to seal the first wire outlet 6021, so that the first accommodating cavity 604 is a closed cavity.

[0074] In the embodiment of the present application, the waterproof sleeve 600 may also include: a sleeve body 601, a first waterproof foam 602 and a second waterproof foam 603; the sleeve body 601 has a sleeve central axis ( Figure 2 ), the central axis of the sleeve is perpendicular to the central axis of the mounting through hole, the sleeve body 601 has a first opening and a second opening opposite to each other along the central axis of the sleeve, the first waterproof foam 602 is connected to the first opening, the second waterproof foam 603 is connected to the second opening, and the sleeve body 601 is closed to form a first accommodating cavity 604.

[0075] The support assembly 200 and the cooling material are both placed in the first accommodating cavity 604 from the first opening, or the support assembly 200 and the cooling material are both placed in the first accommodating cavity from the second opening.

[0076] A first wire outlet 6021 is provided on the first waterproof foam 602, and a second wire outlet 6031 is provided on the second waterproof foam 603. The connecting wires of the positive and negative electrodes of the battery cell 300 extend out through the first wire outlet 6021 and the second wire outlet 6031. The first wire outlet 6021 and the second wire outlet 6031 are both provided with sealant, which is used to seal the first wire outlet 6021 and the second wire outlet 6031, so that the first accommodating cavity 604 is a closed cavity.

[0077] During assembly, first adhere the first waterproof foam 602 to the first opening, then set the bracket assembly 200 in the first accommodating cavity 604 from the second opening, and inject the cooling material into the first accommodating cavity 604 from the second opening; finally, connect the second waterproof foam 603 to the second opening to seal the sleeve body 601.

[0078] After the connecting wires of the positive and negative electrodes of the battery cell 300 extend through the first outlet 6021 and the second outlet 6031 , sealant is provided at the first outlet 6021 and the second outlet 6031 .

[0079] Continue to refer Figure 2-Figure 4 The battery module also includes a shell 100, which has a second accommodating cavity 106. The waterproof sleeve 600 is arranged in the second accommodating cavity 106. A potting glue is also provided between the outer wall of the waterproof sleeve 600 and the inner wall of the shell 100. The potting glue serves as the second layer of waterproofing for the battery cell 300, and the shell 100 serves as the third layer of waterproofing for the battery cell 300.

[0080] In the embodiment of the present application, the potting compound may be thermally conductive silicone.

[0081] In the embodiment of the present application, the potting glue may also be a colloid made of a solid-liquid phase change material, or a colloid made of a phase change material containing microcapsules.

[0082] In the embodiment of the present application, the potting compound can also be a polyurethane potting compound. The polyurethane potting compound is non-corrosive to electrical components and has good adhesion to metals such as steel, aluminum, copper, tin, as well as materials such as rubber, plastic, and wood. The polyurethane potting compound can protect installed and debugged electronic components and circuits from vibration, corrosion, moisture, and dust.

[0083] In the embodiment of the present application, the potting compound can also be an epoxy resin potting compound, which can be cured at room temperature or heated, and has the characteristics of fixation, insulation, waterproofness, oil resistance, dust resistance, corrosion resistance, and resistance to cold and hot shocks. After curing, it has excellent electrical performance and is suitable for potting small and medium-sized electronic components.

[0084] In an embodiment of the present application, 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), the aluminum barrel 102 has a barrel center axis (parallel to the Y-axis direction), the barrel center axis is perpendicular to the hole center axis of the mounting through hole, and the aluminum barrel 102 has a first mounting port and a second mounting port relative to each other along the barrel center axis. The upper shell 101 is connected to the first mounting port, and the lower shell 103 is connected to the second mounting port, so that the upper shell 101, the aluminum barrel 102 and the lower shell 103 jointly enclose the shell 100.

[0085] refer to Figure 5-Figure 7 In the embodiment of the present application, the battery module further includes a first seal 1041 and a second seal 1042. The first seal 1041 is arranged on the inner side of the upper shell 101, and the inner side of the upper shell 101 is close to the aluminum barrel 102; the second seal 1042 is arranged on the inner side of the lower shell 103, and the inner side of the lower shell 103 is close to the aluminum barrel 102; when the upper shell 101 is connected to the first mounting port and the lower shell 103 is connected to the second mounting port, the first seal 1041, the second seal 1042 and the aluminum barrel 102 enclose a second accommodating cavity 106.

[0086] The first sealing member 1041 and the second sealing member 1042 are used to seal the second accommodating cavity 106 to ensure the sealing performance of the housing 100 .

[0087] In an embodiment of the present application, a circle of sealant 700 is provided between the first sealant 1041 and the inner side surface of the shell 101, and a circle of sealant 700 is provided between the second sealant 1042 and the inner side surface of the lower shell 103. The sealant 700 is used to seal the connection between the first sealant 1041 and the second sealant 1042 to further ensure the sealing of the shell 100.

[0088] During assembly, use a jig to place the first seal 1041 into the first installation port of the aluminum barrel 102, then apply glue to seal the circumference of the first seal 1041, and then install the upper shell 101 and fix it with screws; then install the waterproof sleeve 600 into the shell 100, and continue to place the second seal 1042 into the second installation port of the aluminum barrel 102, and then apply glue to seal the circumference of the second seal 1042, and then install the lower shell 103 and fix it with screws.

[0089] Continue to refer Figure 2 and Figure 3 In an embodiment of the present application, the shell 100 also 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 along a direction perpendicular to the central axis of the mounting through hole (Z-axis direction), and the third side surface intersects with both the first side surface and the second side surface, and the fourth side surface intersects with both the first side surface and the second side surface.

[0090] The battery module also includes a protective plate 400, attached to the third side of the bracket assembly 200. This plate protects the battery and balances energy. The bracket assembly 200 not only isolates the cells 300 from heat transfer, preventing heat transfer to surrounding cells 300 in the event of a single cell 300 losing control, but also prevents heat from directly impacting the protective plate 400.

[0091] refer to Figure 2 、 Figure 8 and Figure 9 The battery module also includes a bus bar 500 , which is disposed in the second accommodating cavity 106 of the shell 100 . The bus bar 500 is connected to the bracket assembly 200 , and the bus bar 500 is disposed on both the first side and the second side of the bracket assembly 200 .

[0092] 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.

[0093] 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.

[0094] refer to Figure 10 In 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.

[0095] refer to Figure 11 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.

[0096] 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.

[0097] In the embodiment of the present application, the waterproof sleeve 600 is made of a heat shrink packaging material. The heat shrink packaging material shrinks when heated and has flame retardant, insulating, and temperature-resistant properties.

[0098] The following describes the assembly process of the battery module according to the embodiment of the present application.

[0099] First, install the battery cell 300 into the mounting hole of the bracket assembly 200, fix it with screws, and fix the protection plate 400 with screws. By welding, the busbar 500 with the over-temperature fuse structure is electrically connected to the battery cell 300 and the protection plate 400.

[0100] Put on the waterproof sleeve 600 and perform heat shrink treatment, adhere the first waterproof foam 602 to the first opening of the waterproof sleeve 600, and seal the first outlet 6021 of the first waterproof foam 602 with glue; then pour cooling material into the waterproof sleeve 600 from the second opening of the waterproof sleeve 600 so that the cooling material immerses the battery cell 300; finally, adhere the second waterproof foam 603 to the second opening of the waterproof sleeve 600, and also seal the second outlet 6031 of the second waterproof foam 603 with glue.

[0101] Use a jig to place the first seal 1041 into the aluminum barrel 102, then apply glue around the first seal 1041 to seal it, and then install the upper shell 101 and fix it with screws; then install the waterproof sleeve 600 into the shell 100, continue to place the second seal 1042, then apply glue around the second seal 1042 to seal it, and then install the lower shell 103 and fix it with screws.

[0102] Finally, glue is poured between the waterproof sleeve 600 and the housing 100 from the connector 105 , and after the glue is cured, the connector 105 is installed.

[0103] 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.

[0104] 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.

[0105] 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.

[0106] 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).

[0107] 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: Multiple battery cells; A bracket assembly, wherein the bracket assembly has a plurality of mounting through holes arranged in a honeycomb shape, and each of the battery cells is arranged in a corresponding one of the mounting through holes; A waterproof casing, the waterproof casing having a first accommodating cavity, the bracket assembly being disposed in the first accommodating cavity, the waterproof casing further having a wire outlet, the connecting wires of the positive and negative electrodes of the battery cell extending through the wire outlet, the wire outlet being provided with a sealant; a cooling substance, the cooling substance being disposed in the first accommodation cavity and immersed around the plurality of battery cells; The shell has a second accommodating cavity, the waterproof sleeve is arranged in the second accommodating cavity, and a potting glue is further provided between the outer wall of the waterproof sleeve and the inner wall of the shell.

2. The battery module according to claim 1, wherein: The cooling substance includes cooling liquid or phase change material.

3. The battery module according to claim 1, wherein: The waterproof sleeve comprises: a sleeve body and a first waterproof foam, the sleeve body having a first opening, the bracket assembly and the cooling material are both arranged in the first accommodating cavity through the first opening; The first waterproof foam is connected to the first opening, and a first wire outlet is provided on the first waterproof foam, through which the connecting wires of the positive and negative electrodes extend; The first wire outlet is provided with sealant.

4. The battery module according to claim 1, wherein: The waterproof sleeve comprises: a sleeve body, a first waterproof foam and a second waterproof foam, the sleeve body having a sleeve central axis, the sleeve central axis being perpendicular to the hole central axis of the mounting through hole, and the sleeve body having a first opening and a second opening opposite to each other along the sleeve central axis; The first waterproof foam is connected to the first opening, the second waterproof foam is connected to the second opening, and the bracket assembly and the cooling material are both placed in the first accommodating cavity through the first opening, or the bracket assembly and the cooling material are both placed in the first accommodating cavity through the second opening; The first waterproof foam is provided with a first wire outlet, and the second waterproof foam is provided with a second wire outlet. The connecting wires of the positive and negative electrodes extend through the first wire outlet and the second wire outlet. The first wire outlet and the second wire outlet are both provided with sealant.

5. The battery module according to claim 1, wherein: The housing comprises an aluminum barrel, an upper housing, and a lower housing. The aluminum barrel has a barrel central axis, which is perpendicular to the central axis of the mounting through hole. The aluminum barrel has a first mounting opening and a second mounting opening opposite to each other along the barrel central axis. The upper housing is connected to the first mounting opening, and the lower housing is connected to the second mounting opening. The battery module also includes a first seal and a second seal. The first seal is arranged on the inner side of the upper shell, and the second seal is arranged on the inner side of the lower shell. When the upper shell is connected to the first mounting port and the lower shell is connected to the second mounting port, the first seal, the second seal and the aluminum barrel enclose the second accommodating cavity.

6. The battery module according to claim 5, characterized in that: A circle of sealant is provided between the first sealing member and the inner side surface of the upper shell, and a circle of sealant is provided between the second sealing member and the inner side surface of the lower shell.

7. The battery module according to claim 1, characterized in that: 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 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.

8. The battery module according to claim 7, 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.

9. The battery module according to claim 8, 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.

10. The battery module according to claim 8, wherein: 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.

11. The battery module according to claim 1, wherein: The waterproof sleeve is a sleeve made of heat shrinkable packaging material.

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