Battery cell group, battery pack and vehicle

Abstract

The utility model discloses a battery cell group, battery pack and vehicle, the battery cell group includes: a plurality of battery cells and at least one heat dissipation structure, a plurality of accommodation grooves are formed on the heat dissipation structure, and the plurality of battery cells are respectively matched in the plurality of accommodation grooves. Therefore, the heat dissipation structure is simple in structure, the battery cell is inserted into the accommodating groove formed in the heat dissipation structure, the contact area of the battery cell and the heat dissipation structure can be increased, the heat conduction speed of the heat dissipation structure on heat generated by the battery cell is improved, the heat dissipation efficiency of the heat dissipation structure on the battery cell is improved, thermal runaway of the battery cell is prevented, and the risk of thermal spread of the battery cell is reduced; the use safety of the battery cell group is improved, so that the battery cell group is safer and more reliable.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery cell group, a battery pack and a vehicle. Background Art

[0002] In the prior art, most existing battery packs use a bottom liquid cold plate solution. Since the battery cells themselves store a lot of heat, the contact area between the cold plate and the battery cells is small, the heat dissipation effect is poor, and it cannot meet high-rate charging and discharging. In addition, when one of the battery cells has thermal runaway, the risk of thermal spread is high, posing a safety hazard. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the first purpose of the utility model is to provide a battery pack that can improve the heat dissipation of the battery pack and enhance the safety of the battery pack.

[0004] The second objective of the present invention is to provide a battery pack, comprising a housing and at least one battery cell group as described in the above embodiment.

[0005] The third object of the present utility model is to provide a vehicle, comprising the battery cell group or battery pack described in the above embodiment.

[0006] According to the first aspect of the utility model, the battery cell group includes: multiple battery cells and multiple heat dissipation structures, multiple accommodating grooves are formed on the heat dissipation structure, and the multiple battery cells are respectively matched in the multiple accommodating grooves, and the heat dissipation structure includes multiple first side panels and at least one second side panel, the multiple first side panels are arranged at intervals along the first direction, the second side panel is connected between at least two adjacent first side panels, and the thickness of the first side panels located on both sides of the multiple first side panels along the first direction is less than the thickness of the first side panel located between the first side panels on both sides; the multiple heat dissipation structures are arranged along the first direction, and the sum of the thicknesses of the two first side panels adjacent to each other of two adjacent heat dissipation structures is equal to the thickness of the other first side panels of the heat dissipation structure along the first direction.

[0007] According to the battery cell group of the embodiment of the utility model, the heat dissipation structure has a simple structure, and the battery cell is inserted into the receiving groove formed on the heat dissipation structure, which can increase the contact area between the battery cell and the heat dissipation structure, improve the heat conduction speed of the heat generated by the heat dissipation structure to the battery cell, improve the heat dissipation efficiency of the heat dissipation structure to the battery cell, prevent thermal runaway of the battery cell, reduce the risk of heat spread of the battery cell, improve the safety of the battery cell group when in use, and make the battery cell group safer and more reliable.

[0008] In some embodiments, a plurality of the first side panels and the second side panels together define at least one of the receiving slots.

[0009] In some embodiments, the second side plate is connected between the same ends of at least two adjacent first side plates along a second direction, and the second direction is perpendicular to the first direction.

[0010] In some embodiments, the second side panel is a single piece, and the second side panel is connected to all of the first side panels.

[0011] In some embodiments, the battery cell includes: a battery cell body and a pole, the battery cell body is disposed in the receiving groove, the pole is disposed on the battery cell body, and the pole is located on a side of the battery cell body away from the second side plate.

[0012] In some embodiments, the heat dissipation structure is a silicon carbide ceramic member.

[0013] According to the second aspect of the present invention, the battery pack comprises: a shell and at least one battery cell group, wherein the shell defines an installation cavity, the battery cell group is the battery cell group according to the first aspect of the present invention, and the battery cell group is arranged in the installation cavity.

[0014] In some embodiments, the housing includes: a first housing portion and a second housing portion, wherein the first housing portion and the second housing portion together define the mounting cavity.

[0015] In some embodiments, the battery cell group includes a plurality of battery cells, and the plurality of battery cells are arranged along a first direction. The second shell portion includes a bottom plate and a plurality of side panels, and the plurality of side panels are arranged on the bottom plate. The plurality of side panels all extend along the first direction, and the plurality of side panels are arranged at intervals along a third direction. The battery cell group is arranged between two adjacent side panels, and the first direction, the second direction and the third direction are orthogonal.

[0016] In some embodiments, at least one limiting portion is respectively disposed at both ends of the bottom plate along the first direction, and the limiting portion is suitable for abutting against at least one of the battery cell group and the first shell portion.

[0017] In some embodiments, two of the side panels located on both sides along the third direction are third side panels, and the first shell portion includes a connecting plate and two flaps, the connecting plate is connected to the two third side panels, the two flaps are respectively connected to both sides of the connecting plate along the first direction, and the two flaps are connected to the bottom plate.

[0018] In some embodiments, the second shell portion is constructed as a liquid cooling device, and a liquid inlet and a liquid outlet are respectively formed at both ends of the bottom plate along the first direction, and the bottom plate and the interiors of the plurality of side plates are connected to the liquid inlet and the liquid outlet.

[0019] In some embodiments, at least one air cooling device is disposed on the first housing portion.

[0020] In some embodiments, the air cooling device is opposite to a pole of at least one battery cell of at least one battery cell group.

[0021] The vehicle according to the third aspect of the present invention comprises the battery cell group according to the second aspect of the present invention or the battery pack according to the third aspect of the present invention.

[0022] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0024] Figure 1 Schematic diagram of an explosion of a battery pack according to an embodiment of the utility model.

[0025] Figure 2 It is a schematic diagram of a battery cell group according to an embodiment of the utility model.

[0026] Figure 3 It is a schematic diagram of a heat dissipation structure according to an embodiment of the utility model.

[0027] Figure 4 It is a schematic diagram of the first shell portion according to an embodiment of the utility model.

[0028] Figure 5 Schematic diagram of the second housing portion according to an embodiment of the utility model.

[0029] Reference numerals:

[0030] 100. Battery pack;

[0031] 10. Battery cell group; 11. Battery cell; 12. Battery cell body; 13. Terminal;

[0032] 20. heat dissipation structure; 21. receiving groove; 22. first side plate; 23. second side plate;

[0033] 30. Shell; 31. First shell portion; 311. Connecting plate; 312. Turning plate; 32. Second shell portion; 321. Bottom plate; 322. Side plate; 323. Third side plate; 324. Position limiting portion; 33. Mounting cavity; 331. Sub-mounting cavity; 34. Liquid inlet; 35. Liquid outlet; 313. Air cooling device;

[0034] A. First direction; B. Second direction; C. Third direction. DETAILED DESCRIPTION

[0035] The embodiments of the present invention are described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. Figure 1-Figure 5 The battery cell group 10 according to the embodiment of the utility model is described, and the battery cell group 10 includes: at least one battery cell 11 and at least one heat dissipation structure 20. The heat dissipation structure 20 has a first direction A, a second direction B and a third direction C, and the first direction A, the second direction B and the third direction C are perpendicular to each other.

[0036] Specifically, if Figure 1-Figure 5 As shown, at least one receiving groove 21 is formed on the heat dissipation structure 20 , and the battery cell 11 is disposed in the receiving groove 21 .

[0037] Combination Figure 1-Figure 3 A plurality of accommodating grooves 21 may be formed on the heat dissipation structure 20, and the plurality of accommodating grooves 21 are spaced apart along the first direction A. The battery cell 11 is suitable for being inserted into the accommodating groove 21, and the side surfaces of the battery cell 11 along the first direction A contact and abut against the side plates 322 of the accommodating groove 21 along the first direction A, and the bottom surface of the lower end of the battery cell 11 along the second direction B contacts and abuts against the bottom wall of the accommodating groove 21 along the second direction B.

[0038] According to the battery cell group 10 of the embodiment of the utility model, the structure of the heat dissipation structure 20 is simple, and the battery cell 11 is inserted into the receiving groove 21 formed on the heat dissipation structure 20, which can increase the contact area between the battery cell 11 and the heat dissipation structure 20, improve the heat conduction speed of the heat generated by the heat dissipation structure 20 to the battery cell 11, improve the heat dissipation efficiency of the heat dissipation structure 20 to the battery cell 11, prevent the battery cell 11 from thermal runaway, reduce the risk of heat spread of the battery cell 11, improve the safety of the battery cell group 10 when in use, and make the battery cell group 10 safer and more reliable.

[0039] According to some embodiments of the present invention, Figure 2 and Figure 3 As shown, the heat dissipation structure 20 includes a plurality of first side panels 22 and at least one second side panel 23, the plurality of first side panels 22 are spaced apart along a first direction A, the second side panel 23 is connected between at least two adjacent first side panels 22, and the plurality of first side panels 22 and the second side panels 23 jointly define at least one accommodating groove 21.

[0040] The first side plate 22 extends along the second direction B, i.e., a direction perpendicular to the second side plate 23. The second side plate 23 extends along the first direction A. The second side plate 23 is at least arranged at the bottom of two adjacent first side plates 22. One end of the first side plate 22 along the second direction B is connected to a side surface of the second side plate 23 along the second direction B. Multiple first side plates 22 are arranged on the second side plate 23 at intervals along the first direction A. Multiple first side plates 22 are arranged in parallel on the same side of the second side plate 23 along the first direction A. Two adjacent first side plates 22 and the second side plate 23 jointly define a receiving groove 21. When the second side plate 23 extends along the first direction A to connect multiple first side plates 22, the multiple first side plates 22 and the second side plate 23 jointly define multiple receiving grooves 21, and a battery cell 11 can be arranged in each receiving groove 21. When the battery cell 11 is inserted into the accommodating groove 21, the two side surfaces of the battery cell 11 along the first direction A respectively contact and stop with the one side surface of the two first side plates 22 along the first direction A, and the lower end of the battery cell 11 along the second direction B contacts and stops with the second side plate 23 along the second direction B with the one side surface of the first side plate 22.

[0041] Optionally, there are multiple second side panels 23, and the multiple second side panels 23 are arranged at intervals along the first direction A. A second side panel 23 is provided between each two adjacent first side panels 22, so that the two adjacent first side panels 22 and the second side panel 23 connecting the two first side panels 22 define a receiving groove 21.

[0042] Therefore, the heat dissipation structure 20 includes a plurality of first side plates 22 and a second side plate 23. The plurality of first side plates 22 and the second side plates 23 can define a plurality of accommodating grooves 21 to accommodate a plurality of battery cells 11. The first side plate 22 is located between two adjacent battery cells 11, which can increase the contact area between the first side plate 22 and the battery cell 11, and can also isolate the two battery cells 11 to prevent heat transfer caused by thermal runaway between adjacent battery cells 11 and avoid heat spread. The heat dissipation structure 20 has a simple structure and is easy to process, which can reduce the production cost of the heat dissipation structure 20, and is also easy to assemble the battery cells 11, which can effectively improve the safety of the battery cell group 10 and extend the service life of the battery cells 11.

[0043] According to some embodiments of the present invention, Figure 3As shown, the second side plate 23 is connected between the same ends of at least two adjacent first side plates 22 along the second direction B, and the second direction B is perpendicular to the first direction A. The same end of at least two adjacent first side plates 22 along the second direction B is connected to a side surface of the second side plate 23 along the second direction B, and the first side plate 22 extends along the second direction B in a direction away from the second side plate 23. The two adjacent first side plates 22 and the second side plate 23 connected between the same ends of the two adjacent first side plates 22 along the second direction B jointly define a receiving groove 21, and the battery cell 11 is inserted into the receiving groove 21, and the battery cell 11 is arranged between the two adjacent first side plates 22. As a result, the structures of the first side plate 22 and the second side plate 23 are simple, which can make the structure of the heat dissipation structure 20 more simple and practical, with lower processing difficulty and lower assembly difficulty, which can reduce the production cost of the heat dissipation structure 20 and improve the practicality of the heat dissipation structure 20.

[0044] According to some embodiments of the present invention, Figure 3 As shown, the second side plate 23 is a single piece, and the second side plate 23 is connected to all the first side plates 22. Multiple first side plates 22 are arranged at intervals along the first direction A and are parallel to each other, and multiple first side plates 22 are simultaneously arranged vertically on a side surface of the second side plate 23 in the second direction B. The second side plate 23 is connected to the same end of the multiple first side plates 22 along the second direction B of the heat dissipation structure 20 to define multiple accommodating grooves 21. As a result, the heat dissipation structure 20 has a simple structure, and the contact area between the battery cell 11 and the heat dissipation structure 20 is large, the heat exchange efficiency is high, the heat conduction speed is fast, the processing difficulty is low, and the heat dissipation structure 20 is more practical.

[0045] According to some embodiments of the present invention, Figure 3 As shown, along the first direction A, the thickness of the first side plates 22 located at both sides among the plurality of first side plates 22 is smaller than the thickness of the first side plates 22 located between the first side plates 22 at both sides.

[0046] The multiple first side plates 22 in the heat dissipation structure 20 are arranged at intervals along the first direction A. The thickness of the first side plates 22 located on both sides of the heat dissipation structure 20 along the first direction A is less than the thickness of the first side plates 22 located between the first side plates 22 on both sides, that is, the thickness of the first side plates 22 arranged on both sides along the first direction A is less than the thickness of the first side plates 22 arranged in the middle along the first direction A. One side surface of the two first side plates 22 located on both sides of the heat dissipation structure 20 along the first direction A adjacent to other first side plates 22 contacts and stops with one side surface of the battery cell 11 along the first direction A, and both side surfaces of the first side plates 22 located between the first side plates 22 on both sides along the first direction A contact and stop with the side surfaces of different battery cells 11 along the first direction A respectively.

[0047] When the battery cell group 10 needs to install multiple battery cells 11, multiple heat dissipation structures 20 are arranged along the first direction A, and the sum of the thicknesses of the two first side plates 22 adjacent to each other of two adjacent heat dissipation structures 20 is equal to the thickness of the other first side plates 22 of the heat dissipation structure 20 along the first direction A, thereby ensuring that the multiple battery cells 11 are spaced and evenly arranged in the first direction A, and ensuring uniform heat dissipation between the multiple battery cells 11.

[0048] Therefore, the thickness of the first side plates 22 on both sides of the heat dissipation structure 20 along the first direction A is relatively thin, the thickness of the first side plates 22 arranged between the first side plates 22 on both sides is relatively thick, and the thickness of the first side plates 22 in the middle is relatively thick, which is convenient for ensuring the heat dissipation of the battery cells 11 and preventing heat transfer between two adjacent battery cells 11. At the same time, the first side plates 22 on both sides are relatively thin, which is convenient for thinning the thickness of the first side plates 22 adjacent to each other when two adjacent heat dissipation structures 20 are arranged, ensuring that multiple battery cells 11 are evenly spaced in the heat dissipation structure 20, so that the heat dissipation of the battery cells 11 is uniform.

[0049] According to some embodiments of the present invention, Figure 2 As shown, the battery cell 11 includes: a battery cell body 12 and a pole 13 . The battery cell body 12 is disposed in the receiving groove 21 . The pole 13 is disposed on the battery cell body 12 . The pole 13 is located on a side of the battery cell body 12 away from the second side plate 23 .

[0050] In this embodiment, the cell body 12 is inserted into the receiving groove 21, and the two side surfaces of the cell body 12 along the first direction A are respectively in contact with the one side surface of the two first side plates 22 adjacent to the receiving groove 21 along the first direction A, and one end of the cell body 12 along the second direction B is in contact with the one side surface of the second side plate 23 adjacent to the receiving groove 21 along the second direction B. The pole 13 is provided at the other end of the cell body 12 away from the second side plate 23 along the second direction B, and the pole 13 is suitable for connecting with the relevant wiring harness to supply power to other components.

[0051] Therefore, the pole 13 is located on the side of the battery body 12 away from the second side plate 23 to facilitate the connection and assembly of the relevant wiring harness and the battery cell 11. At the same time, the pole 13 can be prevented from affecting the assembly of the battery cell 11 and the heat dissipation structure 20, so that the contact between the battery cell 11 and the heat dissipation structure 20 is more complete, the contact area between the battery cell 11 and the heat dissipation structure 20 is increased, the space utilization rate inside the battery cell group 10 is higher, the volume of the battery cell group 10 is reduced, and the heat dissipation efficiency of the battery cell group 10 is improved.

[0052] Alternatively, if Figure 1-Figure 3 As shown, there are multiple battery cells 11 , and the heat dissipation structure 20 is formed with multiple accommodating grooves 21 . The multiple battery cells 11 are respectively matched in the multiple accommodating grooves 21 .

[0053] The battery cells 11 correspond one-to-one to the receiving grooves 21. The two side surfaces of the battery cells 11 along the first direction A are in contact with the first side plate 22 of the heat dissipation structure 20. The lower ends of the battery cells 11 along the second direction B are in contact with the second side plate 23 of the heat dissipation structure 20. Multiple battery cells 11 are respectively matched in multiple receiving grooves 21 to ensure that the contact area between each battery cell 11 and the inner wall surface of the receiving groove 21 is the same.

[0054] Therefore, the heat dissipation structure 20 is formed with multiple accommodating grooves 21 to facilitate the configuration of multiple battery cells 11 and to facilitate increasing the capacity of the battery cell group 10. The one-to-one correspondence between the battery cells 11 and the accommodating grooves 21 is conducive to uniform heat dissipation of each battery cell 11, and the multiple battery cells 11 are respectively matched in the multiple accommodating grooves 21 to facilitate separation of the battery cells 11, prevent heat transfer and heat spread, increase the heat dissipation capacity of the heat dissipation structure 20, and improve the safety performance of the battery cell group 10.

[0055] According to some embodiments of the present invention, the heat dissipation structure 20 is a silicon carbide ceramic component.

[0056] Silicon carbide ceramic material is one of the lightest, hardest and strongest technical ceramic materials. Silicon carbide ceramic heat sink is a green and environmentally friendly material. Its structure has a microporous structure, which greatly increases the contact and heat dissipation area with the air. Secondly, silicon carbide ceramic heat sink also has the following advantages: small heat storage, so that the heat generated by the battery cell 11 can be transferred to the outside world faster through the heat dissipation structure 20, improving the heat dissipation capacity and thermal conductivity of the heat dissipation structure 20; high insulation corrosion resistance, which can improve the durability of the heat dissipation structure 20; small high temperature thermal expansion coefficient, improve the overall structural accuracy of the heat dissipation structure 20; light weight and easy installation, reducing the difficulty of assembly between the heat dissipation structure 20 and the battery cell 11. The heat dissipation structure 20 uses a silicon carbide ceramic part with a plurality of accommodating grooves 21 in the middle, which is easy to place the battery cell 11 in it, increasing the contact area between the heat dissipation structure 20 and the surface of the battery cell 11, and timely exporting the heat released by the battery cell 11 to the cooling system of the battery pack 100. The cooling system performs heat exchange in time, improves the heat dissipation rate of the battery cell group 10, and improves the safety of the battery cell group 10.

[0057] Therefore, the heat dissipation structure 20 is a silicon carbide ceramic part, which can effectively improve the comprehensive performance of the heat dissipation structure 20. The side plate 322 of the heat dissipation structure 20 can be used to timely remove the heat emitted by the battery cell 11, thereby improving the heat dissipation efficiency of the heat dissipation structure 20, and further improving the comprehensive performance and safety of the battery cell group 10.

[0058] According to the battery pack 100 in the embodiment of the second aspect of the present utility model, Figure 1-Figure 5 As shown, it includes: a shell 30 and at least one battery cell group 10 . An installation cavity 33 is defined in the shell 30 . The battery cell group 10 is the battery cell group 10 in the above embodiment. The battery cell group 10 is arranged in the installation cavity 33 .

[0059] According to the battery pack 100 of the embodiment of the utility model, a plurality of battery cell groups 10 are neatly arranged in the installation cavity 33. The battery cell group 10 is disposed in the installation cavity 33 to increase the capacity of the battery pack 100. The shell 30 can provide protection for the battery cell group 10 to prevent the battery cell group 10 from being exposed to the outside and colliding with other components, thereby reducing the risk of damage to the battery cell 11, effectively improving the overall structural strength of the battery pack 100, and extending the service life of the battery pack 100. In addition, the shell 30 is in contact with the battery cell group 10, which can provide heat conduction for the battery cell 11 and improve the safety performance of the battery pack 100.

[0060] According to some embodiments of the present invention, Figure 1 , Figure 4 and Figure 5 As shown, the housing 30 includes a first housing portion 31 and a second housing portion 32 , and the first housing portion 31 and the second housing portion 32 together define a mounting cavity 33 .

[0061] The first shell portion 31 and the second shell portion 32 are arranged opposite to each other along the second direction B of the heat dissipation structure 20. The first shell portion 31 is arranged above the second shell portion 32 along the first direction A of the heat dissipation structure 20. The battery cell group 10 is arranged on the second shell portion 32. The bottom side of the battery cell group 10 contacts and stops with the second shell portion 32. The top of the battery cell group 10 is arranged opposite to the second shell portion 32 along the second direction B of the heat dissipation structure 20.

[0062] Therefore, the first shell portion 31 and the second shell portion 32 can provide all-round protection for the battery cell group 10 to prevent the battery cell 11 from being damaged by direct contact with other components. At the same time, the heat generated by the battery cell 11 can be discharged through the first shell portion 31 and the second shell portion 32, thereby improving the heat dissipation efficiency of the shell 30.

[0063] According to some embodiments of the present invention, Figure 1 , Figure 2 and Figure 5 As shown, the battery cell group 10 includes a plurality of battery cells 11, and the plurality of battery cells 11 are arranged along a first direction A. The second shell portion 32 includes a bottom plate 321 and a plurality of side plates 322, and the plurality of side plates 322 are arranged on the bottom plate 321, and the plurality of side plates 322 all extend along the first direction A, and the plurality of side plates 322 are arranged at intervals along a third direction C. The battery cell group 10 is arranged between two adjacent side plates 322, and the first direction A, the second direction B and the third direction C are orthogonal.

[0064] The battery cell group 10 includes multiple battery cells 11 and multiple heat dissipation structures 20. The multiple battery cells 11 are fitted into the receiving grooves 21 defined by the multiple heat dissipation structures 20. The multiple battery cells 11 are arranged in the receiving grooves 21 of the heat dissipation structures 20 at intervals along the first direction A. The multiple heat dissipation structures 20 are arranged along the first direction A on the second shell portion 32. Multiple side panels 322 are arranged perpendicular to the bottom plate 321, and one end of the side panel 322 along the second direction B of the heat dissipation structure 20 is connected to a side surface of the bottom plate 321 along the second direction B of the heat dissipation structure 20. Multiple side panels 322 are arranged in parallel on the bottom plate 321 along the third direction C of the heat dissipation structure 20. Multiple side panels 322 cooperate with the bottom plate 321 to divide the installation cavity 33 into multiple sub-installation cavities 331. The sub-installation cavities 331 extend along the first direction A of the heat dissipation structure 20. The battery cell group 10 is arranged in the sub-installation cavity 331. The bottom surface of the heat dissipation structure 20 along the second direction B contacts and stops with a side surface of the bottom plate 321 along the second direction B provided with the side panel 322, and the two side surfaces of the battery cell 11 along the third direction C of the heat dissipation structure 20 contact and stop with a side surface of two adjacent side panels 322 along the third direction C respectively.

[0065] Thus, the second housing portion 32 includes a bottom plate 321 and a plurality of side plates 322 to divide the mounting cavity 33 into a plurality of sub-mounting cavities 331, so that when the battery cell group 10 is assembled in the mounting cavity 33, the contact area between the battery cell group 10 and the second housing portion 32 is increased, thereby greatly improving the heat dissipation efficiency and heat exchange rate of the battery cell group 10 by the second housing portion 32. The provision of the plurality of side plates 322 can separate the plurality of battery cell groups 10, increase the heat dissipation area, effectively prevent direct contact between the battery cells 11, prevent the occurrence of thermal runaway between the battery cells 11, and slow down the heat spread during thermal runaway, thereby improving the safety of the battery pack 100.

[0066] According to some embodiments of the present invention, Figure 5 As shown, at least one limiting portion 324 is respectively disposed at both ends of the bottom plate 321 along the first direction A, and the limiting portion 324 is suitable for abutting against at least one of the battery cell group 10 and the first housing portion 31 .

[0067] The limiting portion 324 extends along the third direction C of the heat dissipation structure 20, and is slightly higher than the bottom plate 321 along the second direction B of the heat dissipation structure 20. One side of the limiting portion 324 along the first direction A abuts against the bottom of the battery cell group 10, and one side of the limiting portion 324 along the third direction C is suitable for abutting against the first shell portion 31.

[0068] Therefore, the setting of the limiting portion 324 facilitates the cooperation between the first shell portion 31 and the second shell portion 32. The limiting portion 324 can play a certain limiting role on the battery cell group 10 in the first direction A, so that the battery cell group 10 remains stable when assembled in the installation cavity 33, and prevents the battery cell group 10 from shaking inside the battery pack 100 and causing loss of the battery cell 11. The setting of the limiting portion 324 can also enhance the structural strength of the second shell portion 32, thereby enhancing the overall structural strength of the battery pack 100 and extending the service life of the battery pack 100.

[0069] According to some embodiments of the present invention, Figure 1 , Figure 4 and Figure 5 As shown, along the third direction C, two side panels 322 located on both sides of the multiple side panels 322 are third side panels 323, and the first shell part 31 includes a connecting plate 311 and two flaps 312, the connecting plate 311 is connected to the two third side panels 323, the two flaps 312 are respectively connected to the two sides of the connecting plate 311 along the first direction A, and the two flaps 312 are connected to the bottom plate 321.

[0070] The two third side plates 323 in the second housing part 32 are respectively located at the two ends of the bottom plate 321 along the third direction C, and the other multiple side plates 322 are arranged between the two third side plates 323 at intervals along the third direction C. The two flaps 312 of the first housing part 31 extend along the third direction C, and the flaps 312 are perpendicular to the connecting plate 311. One end of the two flaps 312 along the second direction B is respectively connected to the two ends of the connecting plate 311 along the first direction A. When the first housing part 31 is matched with the second housing part 32, one end of the flap 312 away from the connecting plate 311 along the second direction B is suitable for abutting against the limiting portion 324 on the second housing part 32, and the connecting plate 311 of the first housing part 31 is arranged opposite to the bottom plate 321 of the second housing part 32 along the second direction B.

[0071] Therefore, the connecting plate 311 of the first shell part 31, the two flaps 312, the bottom plate 321 of the second shell part 32, and the two third side panels 323 together constitute a complete shell 30, which together define an installation cavity 33. The multiple side panels 322 located between the two third side panels 323 divide the installation cavity 33 into multiple sub-installation cavities 331, which facilitates the assembly of multiple battery cell groups 10 in the installation cavity 33.

[0072] According to some embodiments of the present invention, Figure 5 As shown, the second shell portion 32 is constructed as a liquid cooling device, and a liquid inlet 34 and a liquid outlet 35 are respectively formed at both ends of the bottom plate 321 along the first direction A, and the inside of the bottom plate 321 and multiple side plates 322 are connected to the liquid inlet 34 and the liquid outlet 35.

[0073] The liquid cooling device is a device that can achieve heat transfer or transfer. The bottom plate 321 of the second housing part 32 is provided with a liquid inlet 34 and a liquid outlet 35. The liquid inlet 34 is used to input a heat exchange medium. The heat exchange medium is input into the second housing part 32 through the liquid inlet 34. After the heat exchange medium flows through the second housing part 32, it is output from the second housing part 32 through the liquid outlet 35. The heat exchange medium flowing in the second housing part 32 can play a role in regulating the temperature of the battery cell group 10. When the temperature of the battery cell group 10 is too high, a heat exchange medium with a lower temperature is introduced into the second housing part 32 to reduce the temperature of the battery cell group 10. When the temperature of the battery cell group 10 is too low, a heat exchange medium with a higher temperature is introduced into the second housing part 30 to increase the temperature of the battery cell group 10.

[0074] Therefore, the second shell portion 32 is configured as a liquid cooling device, and a liquid inlet 34 and a liquid outlet 35 are provided on the bottom plate 321 so that a heat exchange medium can be introduced into the second shell portion 32. The heat exchange medium flows in the second shell portion 32 to adjust the temperature of the battery cell group 10, thereby improving the heat exchange efficiency of the second shell portion 32, so that the second shell portion 32 can simultaneously play a protective role and a heat conduction role for the battery cell group 10.

[0075] According to some embodiments of the present invention, Figure 4 As shown, at least one air cooling device 313 is disposed on the first housing portion 31 .

[0076] At least one air cooling device 313 is disposed on the connecting plate 311 of the first housing portion 31. The air cooling device 313 is disposed opposite to the battery cell group 10 along the second direction B. The air cooling device 313 is disposed above the battery cell group 10 along the second direction B. The air cooling device 313 is a device capable of heat transfer or transfer, and can be used to adjust the temperature of the battery cell group 10. The air cooling device 313 can be an axial flow fan, and the main function of the axial flow fan is to timely extract the high-temperature gas on the upper part of the battery cell 11 for heat exchange with the cooling gas in the energy storage cabinet.

[0077] Therefore, the air cooling device 313 provided on the first housing portion 31 can cool the battery pack 10 for heat exchange, realize heat transfer of the battery pack 10, and further adjust the temperature of the battery cell 11 in the battery pack 10 in real time, so that the battery cell 11 is kept within a reasonable temperature range during operation, so as to improve the working efficiency of the battery pack 10, and at the same time protect the battery pack 10 to prevent damage to the battery cell 11 due to excessive temperature. At the same time, the air cooling device 313 on the first housing portion 31 is used in conjunction with the liquid cooling device on the second housing portion 32, which can further improve the overall heat dissipation efficiency of the battery pack 100 and extend the service life and safety performance of the battery pack 100. The air cooling device 313 provided on the first housing portion 31 is also conducive to improving the space utilization rate inside the battery pack 100, reducing the occupation of the external space, so that the first housing portion 31 can play a protective role and an air cooling role at the same time.

[0078] According to some embodiments of the present invention, Figure 1 As shown, the air cooling device 313 is opposite to the pole 13 of at least one battery cell 11 of at least one battery cell group 10 .

[0079] The air cooling device 313 is opposite to the pole 13 of the battery cell group 10 along the second direction B of the heat dissipation structure 20, and the pole 13 of the battery cell group 10 is suitable for connecting with the relevant wiring harness in the battery pack 100. The heat generated by the bottom and side of the battery cell 11 along the second direction B can be discharged through the liquid cooling device of the second shell part 32, and the heat generated by the pole 13 of the battery cell 11 and the top of the battery cell 11 along the second direction B can be taken away by the air cooling device 313 on the first shell part 31.

[0080] As a result, the pole 13 of the battery cell group 10 is not in direct contact with the second shell portion 32. The relative arrangement of the air cooling device 313 and the pole 13 of the battery cell group 10 can make the heat dissipation of the battery cell group 10 more uniform and comprehensive, and make the overall heat dissipation of each battery cell 11 uniform, keep the overall temperature of the battery cell 11 within a reasonable range, and prevent the battery cell 11 from being damaged due to uneven internal heat distribution. The pole 13 of the battery cell 11 is connected to other wiring harnesses of the battery pack 100. The arrangement of the air cooling device 313 can effectively improve the working efficiency of the battery cell 11, keep the overall temperature of the battery pack 100 constant, extend the service life of the battery pack 100, and improve the safety of the battery pack 100.

[0081] In addition, the position of the air cooling device 313 in the battery pack 100 can be selected according to design requirements. In the present embodiment, the air cooling device 313 is opposite to the pole 13 of the battery cell 11, which is a preferred embodiment.

[0082] The vehicle in the embodiment according to the third aspect of the utility model includes the battery cell group 10 or the battery pack 100 in the above embodiment.

[0083] According to the vehicle of the embodiment of the utility model, by using the battery cell group 10 or the battery pack 100 in the above embodiment, the battery pack 100 adopts a design combining an air cooling device 313 with a liquid cooling device, which can effectively improve the heat dissipation efficiency and thermal conductivity of the battery cell group 10 or the battery pack 100, so that the battery pack 100 is suitable for high-rate charging and discharging, and at the same time, the internal structure of the battery pack 100 is simpler, the production difficulty of the battery pack 100 is reduced, the weight of the battery pack 100 is reduced, the production cost of the battery pack 100 is reduced, the structure of the battery pack 100 is simpler and practical, and the safety performance of the battery pack 100 is improved, thereby improving the overall safety performance of the vehicle and improving the user experience.

[0084] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0085] In the description of the present utility model, "first feature" and "second feature" may include one or more of the features. In the description of the present utility model, "plurality" means two or more. In the description of the present utility model, the first feature "above" or "below" the second feature may include the first and second features being in direct contact, or the first and second features being in contact not directly but through another feature between them. In the description of the present utility model, the first feature "above", "above" and "above" the second feature include the first feature being directly above and obliquely above the second feature, or simply means that the first feature is higher in level than the second feature.

[0086] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example.

[0087] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A battery cell group, characterized in that: include: Multiple cells; A plurality of heat dissipation structures, wherein a plurality of accommodating grooves are formed on the heat dissipation structures, and the plurality of battery cells are respectively matched in the plurality of accommodating grooves, and the heat dissipation structures include a plurality of first side plates and at least one second side plate, wherein the plurality of first side plates are arranged at intervals along a first direction, and the second side plate is connected between at least two adjacent first side plates, and the thickness of the first side plates located at both sides among the plurality of first side plates along the first direction is less than the thickness of the first side plate located between the first side plates at both sides; The plurality of heat dissipation structures are arranged along the first direction, and the sum of the thicknesses of the two first side plates adjacent to each other of two adjacent heat dissipation structures is equal to the thickness of the other first side plates of the heat dissipation structures along the first direction.

2. The battery pack according to claim 1, characterized in that: A plurality of the first side plates and the second side plates together define at least one accommodating groove.

3. The battery pack according to claim 2, characterized in that: The second side plate is connected between the same ends of at least two adjacent first side plates along a second direction, and the second direction is perpendicular to the first direction.

4. The battery pack according to claim 2, characterized in that: The second side plate is one piece, and the second side plate is connected to all the first side plates.

5. The battery pack according to claim 2, characterized in that: The battery cell comprises: A battery cell body, the battery cell body being arranged in the receiving groove; A pole, wherein the pole is arranged on the battery cell body, and the pole is located on a side of the battery cell body away from the second side plate.

6. The battery cell assembly according to any one of claims 1 to 5, characterized in that: The heat dissipation structure is a silicon carbide ceramic part.

7. A battery pack, characterized in that: include: a housing, wherein a mounting cavity is defined in the housing; At least one battery cell group, wherein the battery cell group is the battery cell group according to any one of claims 1 to 6, and the battery cell group is arranged in the installation cavity.

8. The battery pack according to claim 7, characterized in that: The housing comprises: a first housing portion; The second housing portion, the first housing portion and the second housing portion jointly define the installation cavity.

9. The battery pack according to claim 8, characterized in that: The battery cell group includes a plurality of battery cells, and the plurality of battery cells are arranged along a first direction; The second shell portion includes a bottom plate and a plurality of side plates, the plurality of side plates are arranged on the bottom plate, the plurality of side plates extend along a first direction, the plurality of side plates are arranged at intervals along a third direction, the battery cell group is arranged between two adjacent side plates, and the first direction, the second direction and the third direction are orthogonal.

10. The battery pack according to claim 9, characterized in that: At least one limiting portion is respectively disposed at two ends of the bottom plate along the first direction, and the limiting portion is suitable for abutting against at least one of the battery cell group and the first housing portion.

11. The battery pack according to claim 9, characterized in that: Two of the side panels located on both sides along the third direction are third side panels; The first shell portion includes a connecting plate and two flaps, the connecting plate is connected to the two third side plates, the two flaps are respectively connected to both sides of the connecting plate along the first direction, and the two flaps are connected to the bottom plate.

12. The battery pack according to any one of claims 9 to 11, characterized in that: The second shell portion is configured as a liquid cooling device, and a liquid inlet and a liquid outlet are respectively formed at two ends of the bottom plate along the first direction, and the insides of the bottom plate and the plurality of side plates are connected to the liquid inlet and the liquid outlet.

13. The battery pack according to claim 12, characterized in that: At least one air cooling device is disposed on the first shell portion.

14. The battery pack according to claim 13, characterized in that: The air cooling device is opposite to a pole of at least one battery cell of at least one battery cell group.

15. A vehicle, characterized in that: A battery cell group comprising any one of claims 1-6 or a battery pack according to any one of claims 7-14.

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