Battery module, battery pack and vehicle

Abstract

The present invention discloses a battery module, a battery pack and a vehicle. The battery module includes a battery cell group, a bus bar and a first cooling plate. The battery cell group has multiple columns and is arranged along a first direction. The battery cell group includes multiple battery cells arranged along a second direction, and the second direction is perpendicular to the first direction. Each battery cell includes a first end face and a pole column disposed on the first end face. The bus bar is electrically connected to the pole column. There are multiple first cooling plates arranged at intervals along the first direction. The first cooling plate has a first cooling surface and a second cooling surface opposite to each other along a third direction. The first end face of each battery cell is heat exchange connected to the first cooling surface in at least one first cooling plate, and each bus bar is heat exchange connected to the first cooling surface and / or the second cooling surface in at least one first cooling plate. The battery module provided by the present invention has the advantages of good heat exchange effect on the pole columns and bus bars of the battery cells, and stable and efficient charging speed of the battery cells.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicles, and particularly to a battery module, a battery pack, and a vehicle. Background Art

[0002] With the gradual increase in the market share of electric vehicles, users' demand for the charging speed of electric vehicles has gradually increased. The main measure to improve the charging speed is high-rate fast charging, which expands the charging rate boundary of the battery cells, enabling the peak charging current of the entire pack to reach 5C or higher. The increase in the charging current will cause the Joule heat generated by overcurrent components such as mechanical parts inside the battery cells and busbars inside the battery pack to increase exponentially.

[0003] In related technologies, a liquid cooling plate is used to dissipate heat from the top of the battery cells where the terminal posts are provided. However, the liquid cooling plate is usually a large plate that heat-exchanges with the tops of all the battery cells where the terminal posts are provided. This setting makes the liquid cooling plate only heat-exchange with the busbar and the end face of the battery cell where the terminal post is provided through its lower surface, resulting in a small heat-exchange area between the liquid cooling plate and the battery cell and the busbar, low heat-exchange efficiency, and thus easily causing the battery cell to overheat and limiting the power, unable to meet the fast charging demand. Summary of the Invention

[0004] The present invention aims to solve at least one of the technical problems in the related technologies to some extent.

[0005] To this end, an embodiment of the present invention provides a battery module, which has the advantages of good heat exchange effect on the terminal posts of the battery cells and the busbar, and stable and efficient charging speed of the battery cells.

[0006] An embodiment of the present invention also provides a battery pack.

[0007] An embodiment of the present invention further provides a vehicle.

[0008] The battery module according to an embodiment of the present invention includes a battery cell group, a busbar, and a first cooling plate. The battery cell group has multiple columns and is arranged along a first direction. The battery cell group includes multiple battery cells arranged along a second direction, and the second direction is perpendicular to the first direction. The battery cell includes a first end face and a terminal post provided on the first end face; the busbar is electrically connected to the terminal post; there are multiple first cooling plates arranged at intervals along the first direction. The first cooling plate has a first cooling surface and a second cooling surface opposite to each other along a third direction. The first end face of each battery cell is heat-exchange connected to the first cooling surface in at least one of the first cooling plates, and each busbar is heat-exchange connected to the first cooling surface and / or the second cooling surface in at least one of the first cooling plates.

[0009] According to the battery module of an embodiment of the present invention, a plurality of first cooling plates are arranged on the first end face of the battery cells, and are heat exchange connected to the first end face of each battery cell through the first cooling surface in at least one of the first cooling plates. At this time, the first cooling plate is adjacent to the pole post on the first end face to effectively cool the pole post. At the same time, each busbar can be heat exchange connected to the first cooling surface in at least one of the first cooling plates, or can pass through the gap between two adjacent first cooling plates and be heat exchange connected to the second cooling surface in at least one of the first cooling plates. Thereby, while increasing the total heat exchange area between the first cooling plate and the busbar and the battery cells, direct cooling of the busbar is also achieved. Furthermore, the heat generated by mechanical components such as the inner wound tabs of the battery cells can be quickly taken away by the first cooling plate through the first end face and the busbar, effectively avoiding the power limitation of the battery cells caused by local overheating of the battery module, and the energy replenishment of the battery cells is efficient and stable.

[0010] In some embodiments, the first end face includes a first shoulder and a second shoulder arranged at intervals along the first direction; wherein,

[0011] In any two adjacent columns of the battery cell groups, the adjacent first shoulder and the second shoulder are simultaneously heat exchange connected to the first cooling surface of a first cooling plate. In the column of battery cell groups located at the edge, the first shoulder is heat exchange connected to the first cooling surface of a first cooling plate located at the edge. In the other column of battery cell groups located at the edge, the second shoulder is heat exchange connected to the first cooling surface of another first cooling plate located at the edge;

[0012] Or, the number of the first cooling plates is twice the number of the battery cell groups, each battery cell group corresponds to two first cooling plates, and the first shoulder and the second shoulder in each battery cell group are respectively heat exchange connected to the first cooling surfaces of the corresponding two first cooling plates.

[0013] In some embodiments, the ratio of the area of the first shoulder to the area of the first end face is 10%-50%, and the ratio of the area of the second shoulder to the area of the first end face is 10%-50%.

[0014] In some embodiments, the first cooling plate has a first end and a second end opposite to each other along the second direction. The battery module further includes a first manifold, a second manifold, a third manifold, a water inlet joint, and a water outlet joint. The first manifold is communicated with the first end of each first cooling plate; the second manifold is communicated with the second ends of a part of the first cooling plates; the third manifold is communicated with the second ends of the remaining part of the first cooling plates, and the two parts of the first cooling plates are arranged alternately along the first direction; the water inlet joint is communicated with the second manifold, and the water outlet joint is communicated with the third manifold.

[0015] In some embodiments, the first manifold, the second manifold, and the third manifold are all connected to the first cooling plate through quick connectors. The quick connectors include two-way connectors and / or three-way connectors with a turning angle of 90°. The first manifold, the second manifold, and the third manifold are all located on the side of the first cooling plate adjacent to the battery cell.

[0016] In some embodiments, the second manifold and the third manifold are arranged at intervals along the second direction. The battery cell includes a second end face opposite to the first end face. The second manifold and the third manifold are located between the first end face and the second end face in the third direction.

[0017] In some embodiments, the first cooling plate includes a plate body, a first plug, a second plug, a first water nozzle, and a second water nozzle. A cooling flow channel penetrating the plate body along the second direction is formed in the plate body; the first plug and the second plug are respectively connected to two ends of the plate body, and the first plug and the second plug respectively seal the first end opening and the second end opening of the cooling flow channel; the first water nozzle and the second water nozzle are both connected to the wall of the plate body forming the first cooling surface. The first water nozzle and the second water nozzle are respectively arranged at the first end and the second end of the plate body and are both connected to the cooling flow channel. The first water nozzle and the second water nozzle are both connected to the quick connector.

[0018] In some embodiments, the plate body includes a bottom wall, a first side wall, a top wall, and a second side wall that are connected end to end in sequence. The outer surface of the bottom wall forms the first cooling surface, and the outer surface of the top wall forms the second cooling surface. The wall thickness of each of the bottom wall, the first side wall, the top wall, and the second side wall is greater than or equal to 0.4 mm.

[0019] In some embodiments, the thickness of the wall of the plate body forming the first cooling surface is greater than or equal to 0.8 mm. At least one of the first plug, the second plug, the first water nozzle, and the second water nozzle is bonded or welded to the plate body.

[0020] In some embodiments, the first cooling surface is bonded to the first end face of each battery cell through a thermal conductive adhesive, and / or the second cooling surface is bonded to the bus bar through a thermal conductive adhesive; wherein,

[0021] The thermal conductivity of the thermal conductive adhesive is greater than or equal to ≥2 W / (m*K), the thixotropy is greater than 4, and the thickness is less than or equal to 0.5 mm.

[0022] In some embodiments, an insulating layer is provided on the surface of at least one of the first cooling plate and the bus bar. The first cooling plate and the bus bar are in insulating contact through the insulating layer.

[0023] In some embodiments, the thermal conductivity of the insulating layer is greater than or equal to 0.6 W / (m*K), the volume resistivity is greater than or equal to 7e+15Ω*cm, and the thickness is less than or equal to 0.25 mm.

[0024] In some embodiments, the second cooling surface is connected to each of the bus bars for heat exchange, the third direction is consistent with the thickness direction of the first cooling plate, the bus bars are connected to the end faces of the poles, the distance between the end faces of the poles and the second cooling surface is 0-6 mm, and the thickness of the first cooling plate is greater than or equal to 3 mm.

[0025] In some embodiments, the busbar includes a first connecting portion, a second connecting portion and a heat dissipation portion, the first connecting portion and the second connecting portion are electrically connected to the poles on different battery cells, respectively, and the heat dissipation portion is located on the side of the first cooling plate away from the first end face and is connected to the second cooling surface for heat exchange.

[0026] In some embodiments, the busbar includes a first busbar connecting two adjacent battery cells in the same battery cell group in series and a second busbar connecting two adjacent battery cell groups in series;

[0027] The heat dissipation portion in the first busbar is connected to at least one of the first connecting portion and the second connecting portion, and the heat dissipation portion is connected to the second cooling surface on one or two adjacent first cooling plates for heat exchange;

[0028] The heat dissipation portion in the second busbar connects the first connection portion and the second connection portion, and the heat dissipation portion is connected to the second cooling surface on the first cooling plate located between the first connection portion and the second connection portion for heat exchange.

[0029] In some embodiments, the poles include positive poles and negative poles spaced apart along the first direction;

[0030] Alternatively, the electrode includes one of a positive electrode and a negative electrode, the battery cell includes a second end face opposite to the first end face, the second end face is provided with the other of the positive electrode and the negative electrode, and the first end faces of any two adjacent battery cells in the same battery cell group are respectively provided with the positive electrode and the negative electrode.

[0031] In some embodiments, the first cooling plate includes a plurality of first cooling plates arranged at intervals along the first direction, the first end face includes a first shoulder and a second shoulder arranged at intervals along the first direction, in any two adjacent columns of the battery cell groups, the adjacent first shoulder and the second shoulder are simultaneously heat-exchange connected to the first cooling surface of a first cooling plate, in a column of the battery cell groups located at the edge, the first shoulder is heat-exchange connected to the first cooling surface of a first cooling plate located at the edge, and in another column of the battery cell groups located at the edge, the second shoulder is heat-exchange connected to the first cooling surface of another first cooling plate located at the edge; wherein,

[0032] The cross-sectional area of the cooling flow channel in the first cooling plate located at the edge is half of the cross-sectional area of the cooling flow channel in the first cooling plate located in the middle, and / or, the cross-sectional area of the inlet and outlet in the first cooling plate located at the edge is half of the cross-sectional area of the inlet and outlet in the first cooling plate located in the middle.

[0033] The battery pack according to an embodiment of the present invention includes the battery module as described in any of the above embodiments.

[0034] The technical advantages of the battery pack according to an embodiment of the present invention are the same as those of the battery module in the above embodiments, and will not be elaborated here.

[0035] The vehicle according to an embodiment of the present invention includes the battery pack as described in the above embodiment.

[0036] The technical advantages of the vehicle according to an embodiment of the present invention are the same as those of the battery pack in the above embodiments, and will not be elaborated here. Description of the Drawings

[0037] Figure 1 is an axonometric view of the battery module according to an embodiment of the present invention.

[0038] Figure 2 is a top view of the battery module according to an embodiment of the present invention.

[0039] Figure 3 is a partially enlarged schematic view of the battery module at the water inlet joint according to an embodiment of the present invention.

[0040] Figure 4 is a partially enlarged left view of the battery module at the first cooling plate according to an embodiment of the present invention.

[0041] Figure 5 is a partially enlarged schematic view of the battery module at the first bus bar according to an embodiment of the present invention.

[0042] Figure 6It is a partially enlarged schematic view of a battery module according to an embodiment of the present invention, wherein the battery cell is a blade battery cell.

[0043] Figure 7 It is another partially enlarged schematic view of a battery module according to an embodiment of the present invention, wherein the battery cell is a cylindrical battery cell.

[0044] Reference numerals:

[0045] 1. Battery cell; 11. First shoulder; 12. Second shoulder; 13. Terminal; 2. First bus bar; 21. First connection part; 22. Second connection part; 23. Heat dissipation part; 24. Bending part; 3. Second bus bar; 4. First cooling plate; 41. Plate body; 411. First cooling surface; 412. Second cooling surface; 42. First plug; 43. First water nozzle; 5. First manifold; 6. Second manifold; 7. Third manifold; 8. Inlet joint; 9. Outlet joint; 10. Quick plug joint; 110. Heat dissipation layer. Detailed implementation manners

[0046] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

[0047] The following will be combined with Figures 1-7 to describe the battery module according to an embodiment of the present invention.

[0048] The battery module according to an embodiment of the present invention includes a battery cell group, a bus bar, and a first cooling plate. The battery cell group has multiple columns and is arranged along a first direction. The battery cell group includes a plurality of battery cells 1 arranged along a second direction, the second direction is perpendicular to the first direction, and the battery cell 1 includes a first end face and a terminal 13 provided on the first end face. The bus bar is electrically connected to the terminal 13. There are multiple first cooling plates 4 arranged at intervals along the first direction. The first cooling plate 4 has a first cooling surface 411 and a second cooling surface 412 opposite to each other along a third direction. The first end face of each battery cell 1 is heat exchange connected to the first cooling surface 411 in at least one first cooling plate 4, and each bus bar is heat exchange connected to the first cooling surface 411 and / or the second cooling surface 412 in at least one first cooling plate.

[0049] According to the battery module of an embodiment of the present invention, the first cooling plate 4 is disposed on the first end face of the battery cell 1 and is heat-exchangeably connected to the first end face of each battery cell 1 via the first cooling surface 411 of at least one first cooling plate 4. In this case, the first cooling plate 4 is adjacent to the pole 13 on the first end face to achieve effective cooling of the pole 13. At the same time, each busbar can either be heat-exchangeably connected to the first cooling surface 411 of at least one first cooling plate 4, or pass through the gap between two adjacent first cooling plates 4 and be heat-exchangeably connected to the second cooling surface 412 of at least one first cooling plate 4. This increases the total heat exchange area between the first cooling plate, the busbar, and the battery cell 1 while also achieving direct cooling of the busbar. This allows the heat generated by mechanical components such as the winding tabs within the battery cell 1 to be quickly removed by the first cooling plate through the first end face and the busbar, effectively preventing local overheating of the battery module from limiting the power of the battery cell 1 and ensuring efficient and stable energy replenishment of the battery cell 1.

[0050] It should be noted that the design of the first cooling plate 4 also effectively prevents the temperature of the winding tabs inside the battery cell 1 from being too high, which may cause thermal runaway of the battery pack, making the battery pack safer to use.

[0051] For ease of understanding, Figure 1 The direction indicated by the arrow Y is the second direction of the battery module according to the embodiment of the present invention. Figure 1 The direction indicated by the arrow X is the first direction of the battery module according to an embodiment of the present invention. Figure 1 The direction indicated by the arrow Z is the third direction of the battery module according to the embodiment of the present invention.

[0052] In some embodiments, the first end surface includes a first shoulder 11 and a second shoulder 12 spaced apart along the first direction.

[0053] Among them, such as Figures 1-5 and Figure 7 As shown, in any two adjacent rows of battery cell groups, the adjacent first shoulders 11 and second shoulders 12 are simultaneously in heat exchange contact with the first cooling surface 411 of a first cooling plate 4. In one row of battery cell groups located at the edge, the first shoulders 11 are in heat exchange contact with the first cooling surface 411 of one first cooling plate 4 located at the edge. In another row of battery cell groups located at the edge, the second shoulders 12 are in heat exchange contact with the first cooling surface 411 of another first cooling plate 4 located at the edge. This allows for a smaller number of first cooling plates 4 to achieve heat exchange contact with the first shoulders 11 and second shoulders 12 of all battery cells 1, meeting the cooling requirements for the battery cells 1 and the busbar while further improving the assembly efficiency of the battery module.

[0054] Or, as Figure 6As shown, the number of the first cooling plates 4 is twice the number of the battery cell groups. Each battery cell group corresponds to two first cooling plates 4. The first shoulder 11 and the second shoulder 12 in each battery cell group are respectively in heat exchange connection with the first cooling surfaces 411 of the corresponding two first cooling plates 4. That is, each battery cell group has two independent first cooling plates 4. The connection error between the first cooling plate 4 and the first end face of the corresponding battery cell 1 is smaller, and the connection strength and connection reliability between the first cooling plate 4 and the corresponding battery cell 1 are higher.

[0055] As Figure 6 shown, a pole post 13 is arranged on the first end face. The widths of the first shoulder 11 and the second shoulder 12 on both sides of the pole post 13 are larger, which is more convenient for independently arranging a first cooling plate 4.

[0056] In some embodiments, the ratio of the area of the first shoulder 11 to the area of the first end face is 10%-50%, and the ratio of the area of the second shoulder 12 to the area of the first end face is 10%-50%.

[0057] The total area of the first shoulder 11 and the second shoulder 12, that is, the total contact area between the first cooling plate 4 and the first end face. The contact area within the above range ensures better cooling effect of the first cooling plate 4 on the mechanical parts near the pole post 13 of the battery cell 1, and can effectively avoid the pole post 13 and the possible explosion-proof valve and FPC on the first end face, ensuring that the setting of the first cooling plate 4 does not affect the original functions of the battery module.

[0058] Specifically, the ratio of the area of the first shoulder 11 to the area of the first end face is 10%, 30% or 50%, and the ratio of the area of the second shoulder 12 to the area of the first end face is 10%, 30% or 50%.

[0059] In some embodiments, as Figure 1 and Figure 2 shown, the first cooling plate 4 has a first end and a second end opposite to each other in the second direction. The battery module further includes a first manifold 5, a second manifold 6, a third manifold 7, a water inlet joint 8 and a water outlet joint 9. The first manifold 5 is communicated with the first end of each first cooling plate 4. The second manifold 6 is communicated with the second ends of a part of the first cooling plates 4. The third manifold 7 is communicated with the second ends of the remaining part of the first cooling plates 4. The two parts of the first cooling plates 4 are arranged alternately in the first direction. The water inlet joint 8 is communicated with the second manifold 6, and the water outlet joint 9 is communicated with the third manifold 7.

[0060] In the cooling condition, the first cooling plate 4 absorbs heat from the battery cell 1 and the bus bar, and the temperature of the internal coolant will gradually increase along the flow direction. By arranging the first cooling plates 4 communicating with the second header pipe 6 and the first cooling plates 4 communicating with the third header pipe 7 to be alternately arranged along the first direction, the flow directions of the coolant in the two first cooling plates 4 corresponding to the first shoulder 11 and the second shoulder 12 of each battery cell 1 are opposite, so that the heat exchange between each battery cell 1 in the same row of battery cells 1 and the two first cooling plates 4 is substantially the same, thereby effectively ensuring the temperature uniformity of the battery cells 1 in the same row of battery cells 1.

[0061] Exemplarily, there are six columns in the row of battery cells 1 and seven first cooling plates 4. The second ends of three of the first cooling plates 4 are communicated with the second header pipe 6, and the second ends of the other four first cooling plates 4 are communicated with the third header pipe 7.

[0062] In some embodiments, the first header pipe 5, the second header pipe 6 and the third header pipe 7 are all communicated with the first cooling plate 4 through quick connectors 10. The quick connectors 10 include two-way connectors and / or three-way connectors with a turning angle of 90°. The first header pipe 5, the second header pipe 6 and the third header pipe 7 are all located on the side of the first cooling plate 4 adjacent to the battery cell 1.

[0063] By using two-way connectors and / or three-way connectors with a turning angle of 90° to realize the connection between each of the first header pipe 5, the second header pipe 6 and the third header pipe 7 and the first cooling plate 4, and arranging the first header pipe 5, the second header pipe 6 and the third header pipe 7 below the first cooling plate 4, the coolant in the first cooling plate 4 can flow downward, so that its flow direction changes from the second direction to the first direction, which neither occupies the extra space in the first direction and the second direction of the battery module nor excessively occupies the space dimension in the third direction, i.e., the height direction, effectively ensuring the energy density requirement of the battery pack.

[0064] Specifically, among the multiple first cooling plates 4 communicated with the second header pipe 6, the first cooling plates 4 located at the edges are communicated with the second header pipe 6 through two-way connectors, and the middle first cooling plates 4 are communicated with the second header pipe 6 through three-way connectors; among the multiple first cooling plates 4 communicated with the third header pipe 7, the first cooling plates 4 located at the edges are communicated with the second header pipe 6 through two-way connectors, and the middle first cooling plates 4 are communicated with the third header pipe 7 through three-way connectors.

[0065] In some embodiments, such as Figure 2As shown, the second manifold 6 and the third manifold 7 are arranged at intervals along the second direction. The battery cell 1 includes a second end face opposite to the first end face. The second manifold 6 and the third manifold 7 are located between the first end face and the second end face in the third direction. Compared with their arrangement along the third direction, it can avoid the structural beam of the battery pack and effectively prevent the second manifold 6 and the third manifold 7 from having too large a size along the third direction and occupying the size of the battery module in the height direction, further ensuring the energy density requirement of the battery pack.

[0066] As Figure 2 shown, the third manifold 7 is located on the side of the second manifold 6 away from the battery cell 1.

[0067] In some embodiments, as Figure 4 shown, the first cooling plate 4 includes a plate body 41, a first plug 42, a second plug, a first water nozzle 43 and a second water nozzle. A cooling flow channel is formed in the plate body 41 and penetrates the plate body 41 along the second direction. The first plug 42 and the second plug are respectively connected to both ends of the plate body 41, and the first plug 42 and the second plug respectively seal the first end opening and the second end opening of the cooling flow channel. Both the first water nozzle 43 and the second water nozzle are connected to the wall of the plate body 41 that forms the first cooling surface 411. The first water nozzle 43 and the second water nozzle are respectively arranged at the first end and the second end of the plate body 41 and are both communicated with the cooling flow channel. Both the first water nozzle 43 and the second water nozzle are connected to the quick connector 10.

[0068] Connecting the first water nozzle 43 and the second water nozzle below the plate body 41 so that the first water nozzle 43 and the second water nozzle do not occupy the size of the battery module in the height direction. The plate body 41 can be formed by an extrusion process, which is convenient for processing and has low cost.

[0069] In some embodiments, the plate body 41 includes a bottom wall, a first side wall, a top wall and a second side wall that are connected end to end in sequence. The outer surface of the bottom wall forms the first cooling surface 411, and the outer surface of the top wall forms the second cooling surface 412. The wall thickness of each of the bottom wall, the first side wall, the top wall and the second side wall is greater than or equal to 0.4 mm.

[0070] This setting enables the plate body 41 to be processed and formed by an extrusion process. The wall thickness of each of the bottom wall, the first side wall, the top wall and the second side wall can also be designed to be 0.4 mm to minimize the occupation of space in the height direction and further ensure the energy density requirement of the battery pack.

[0071] For example, the material of the plate body 41 is 3003 aluminum, and the wall thickness at any position in the plate body 41 is 0.4 mm, 0.5 mm, 0.8 mm or 1 mm.

[0072] In some embodiments, the thickness of the wall of the plate body 41 that forms the first cooling surface 411 is greater than or equal to 0.8 mm, and at least one of the first plug 42, the second plug, the first water nozzle 43, and the second water nozzle is adhesively bonded or welded to the plate body 41.

[0073] That is, the wall thickness of the bottom wall is greater than or equal to 0.8 mm. At this size, the first plug 42, the second plug, the first water nozzle 43, and the second water nozzle can be connected to the plate body 41 by brazing or laser welding, which can improve the production line beat and airtight reliability, and also minimize the space occupied by the plate body 41 in the height direction.

[0074] In some embodiments, the second cooling surface 412 is heat exchange connected to each bus bar, the third direction is consistent with the thickness direction of the first cooling plate 4, the bus bar is connected to the end face of the pole column 13, and the distance between the end face of the pole column 13 and the second cooling surface 412 is 0 - 6 mm, and the thickness of the first cooling plate 4 is greater than or equal to 3 mm.

[0075] The thickness of the first cooling plate 4 is greater than or equal to 3 mm to ensure that the internal cooling flow channel has a sufficient cross-sectional area, ensure that the internal flow resistance of the first cooling plate 4 is not too high, and meet the overall package flow demand. On this basis, when the second cooling plate of the first cooling plate 4 is higher than the end face of the pole column 13, the difference therebetween does not exceed 6 mm, thereby further avoiding the first cooling plate 4 occupying the space of the battery module in the height direction and ensuring the overall package energy density demand.

[0076] Specifically, at least a part of the bus bar is located above the first cooling plate 4 and is heat exchange connected to the second cooling surface 412. At this time, the part of the bus bar located above the first cooling plate 4 can be bent upward or downward relative to the other part, and the bus bar can also be a straight plate, specifically based on whether the second cooling surface 412 of the first cooling plate 4 is higher than, lower than, or coplanar with the end face of the pole column 13.

[0077] In some embodiments, as Figure 4 shown, the first cooling surface 411 is adhesively bonded to the first end face of each battery cell 1 through a thermal conductive adhesive, and / or the second cooling surface 412 is adhesively bonded to the bus bar through a thermal conductive adhesive. Thereby ensuring the cooling reliability of the first cooling plate 4 for the battery cells 1 and the bus bar.

[0078] When the bottom of each battery cell 1 is adhesively bonded and connected by the second cooling plate, the adhesive bonding of the first cooling plate 4 to each battery cell 1 also provides sufficient binding force for the top of each battery cell 1, effectively avoiding the battery cell 1 from tilting due to inconsistent binding forces at the bottom and top of the battery cell 1, and further pulling the pole column 13 to cause the battery cell 1 to leak liquid.

[0079] Specifically, the thermal conductive adhesive can be a structural thermal conductive adhesive, a double-sided adhesive, or other adhesives with sufficient bonding strength. The thermal conductivity of the thermal conductive adhesive is greater than or equal to ≥2 W / (m*K), and the thixotropy is greater than 4. This enables the thermal conductive adhesive to meet the thermal conductivity requirements and bonding strength requirements while also limiting its thickness to less than 0.5 mm, further reducing the space occupied by the thermal conductive adhesive in the height direction of the battery module.

[0080] In some embodiments, an insulating layer is provided on the surface of at least one of the first cooling plate 4 and the busbar, and the first cooling plate 4 and the busbar are in insulating contact through the insulating layer.

[0081] Insulating the first cooling plate 4 and the busbar can improve the safety between the busbars and ensure the stability and reliability of the battery module circuit.

[0082] Specifically, the insulating layer can be fixed on the surfaces of the first cooling plate 4 and the busbar by spraying insulating paint or insulating powder, hot-pressing or cold-pressing an insulating film, etc. At the same time, the surface of the busbar welded to the pole 13 is not insulated.

[0083] In some embodiments, the thermal conductivity of the insulating layer is greater than or equal to 0.6 W / (m*K), the volume resistivity is greater than or equal to 7e+15 Ω*cm, and the thickness is less than or equal to 0.25 mm. This setting can not only ensure the insulation strength but also prevent the thermal resistance of the insulating layer from being too large due to its excessive thickness, effectively improving the heat exchange efficiency between the busbar and the battery cell 1 and the first cooling plate 4.

[0084] In some embodiments, as Figures 4-7 shown, the busbar includes a first connection portion 21, a second connection portion 22, and a heat dissipation portion 23. The first connection portion 21 and the second connection portion 22 are respectively electrically connected to the poles 13 on different battery cells 1, and the heat dissipation portion 23 is located on the side of the first cooling plate 4 facing away from the first end face and is heat exchange-connected to the second cooling surface 412.

[0085] The busbar is heat exchange-connected to the first cooling plate 4 through the extended heat dissipation portion 23 to cool the first connection portion 21 and the second connection portion 22 in the busbar. At this time, the heat dissipation portion 23 can avoid the first cooling plate 4 and be located above the first cooling plate 4, and can also be in close contact with the second cooling surface 412, thereby reducing the stress impact caused by the flatness of the contact surface.

[0086] Specifically, as Figures 1-3As shown, the bus bar includes a first bus bar 2 connecting two adjacent battery cells 1 in the same battery cell group in series and a second bus bar 3 connecting two adjacent battery cell groups in series. The heat dissipation part 23 in the first bus bar 2 is connected to at least one of the first connection part 21 and the second connection part 22, and the heat dissipation part 23 is heat exchange connected to the second cooling surface 412 on one or two adjacent first cooling plates 4. The heat dissipation part 23 in the second bus bar 3 connects the first connection part 21 and the second connection part 22, and the heat dissipation part 23 is heat exchange connected to the second cooling surface 412 on the first cooling plate 4 located between the first connection part 21 and the second connection part 22.

[0087] In some embodiments, as Figure 5 shown, the first bus bar 2 further includes a bending part 24 connecting the first connection part 21 and the second connection part 22. The bending part 24 is bent in the third direction and forms a groove extending in the first direction.

[0088] Thus, when the battery cell 1 expands and the pole column 13 is pulled by the bus bar, the bus bar can generate a certain amount of stretching with the deformation of the bending part 24, avoiding excessive stress on the pole column 13 of the battery cell 1 and resulting in liquid leakage.

[0089] In some embodiments, the battery module further includes a second cooling plate. The battery cell 1 includes a second end face opposite to the first end face, and the second cooling plate is electrically connected to the second end face of each battery cell 1.

[0090] At this time, as Figures 1-5 and Figure 7 shown, the pole column 13 may include a positive pole column and a negative pole column arranged at intervals in the first direction. Alternatively, as Figure 6 shown, the pole column 13 may include one of a positive pole column and a negative pole column, and the other of the positive pole column and the negative pole column is provided on the second end face. The first end faces of any two adjacent battery cells 1 in the same battery cell group are respectively provided with a positive pole column and a negative pole column. For any of the above-mentioned battery cell 1 arrangement forms, and not limited to blade battery cells 1 and cylindrical battery cells 1, the first cooling plate 4 can be used to cool the battery cell 1 at the position of the pole column 13, ensuring the fast charging requirement of the battery module.

[0091] It should be noted that the number of columns of the battery cell group and the number of battery cells 1 in the battery cell group can be flexibly designed according to the required power and voltage. The total number of battery cells 1 can be 160 - 220, so that the battery module meets the usage requirements of the vast majority of finished products.

[0092] In some embodiments, when the number of the first cooling plates 4 is one more than the number of columns of the battery cell group, the cross-sectional area of the cooling flow channels in the first cooling plates 4 located at the edges is half of the cross-sectional area of the cooling flow channels in the first cooling plates 4 located in the middle, and / or the cross-sectional area of the inlets and outlets in the first cooling plates 4 located at the edges is half of the cross-sectional area of the inlets and outlets in the first cooling plates 4 located in the middle. Thereby, the flow rate in the first cooling plates 4 located at the edges can be made half of the flow rate in the remaining first cooling plates 4, thereby ensuring that the cooling effect of the first cooling plates 4 on each battery cell 1 is substantially the same, and further ensuring the requirement of the temperature uniformity of each battery cell 1.

[0093] The battery pack according to an embodiment of the present invention includes the battery module as described in any of the above embodiments.

[0094] The technical advantages of the battery pack according to an embodiment of the present invention are the same as those of the battery module in the above embodiments, and will not be described herein again.

[0095] The vehicle according to an embodiment of the present invention includes the battery pack as described in the above embodiment.

[0096] The technical advantages of the vehicle according to an embodiment of the present invention are the same as those of the battery pack in the above embodiments, and will not be described herein again.

[0097] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention.

[0098] In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0099] In the present invention, unless otherwise clearly specified or limited, terms such as "install", "connect", "link", "fix", etc. shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection, an electrical connection, or communicable with each other; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0100] In the present invention, unless otherwise clearly specified or limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "below" and "beneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0101] In the present invention, terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0102] Although the above embodiments have been shown and described, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Any changes, modifications, substitutions, and variations made by those of ordinary skill in the art to the above embodiments are within the protection scope of the present invention.

Claims

1. A battery module, characterized in that, Comprising: A battery cell group, the battery cell group having multiple columns arranged along a first direction, the battery cell group including a plurality of battery cells arranged along a second direction, the second direction being perpendicular to the first direction, the battery cell including a first end face and a pole column provided on the first end face; A bus bar, the bus bar being electrically connected to the pole column; And A first cooling plate, there being a plurality of the first cooling plates arranged at intervals along the first direction, the first cooling plate having a first cooling surface and a second cooling surface opposite to each other in a third direction, the first end face of each battery cell being heat exchange connected to the first cooling surface in at least one of the first cooling plates, and each bus bar being heat exchange connected to the first cooling surface and / or the second cooling surface in at least one of the first cooling plates; The first end face includes a first shoulder and a second shoulder arranged at intervals along the first direction; wherein, In any two adjacent columns of the battery cell group, the adjacent first shoulder and the second shoulder are simultaneously heat exchange connected to the first cooling surface of a first cooling plate, in the column of the battery cell group at the edge, the first shoulder is heat exchange connected to the first cooling surface of a first cooling plate at the edge, and in the other column of the battery cell group at the edge, the second shoulder is heat exchange connected to the first cooling surface of another first cooling plate at the edge.

2. The battery module according to claim 1, wherein The number of the first cooling plates is twice the number of the battery cell groups, each battery cell group corresponding to two first cooling plates, and the first shoulder and the second shoulder in each battery cell group are respectively heat exchange connected to the first cooling surfaces of the corresponding two first cooling plates.

3. The battery module according to claim 2, wherein The ratio of the area of the first shoulder to the area of the first end face is 10% - 50%, and the ratio of the area of the second shoulder to the area of the first end face is 10% - 50%.

4. The battery module according to claim 2, wherein The first cooling plate has a first end and a second end opposite to each other in the second direction, and the battery module further includes: A first manifold, the first manifold being communicated with the first end of each first cooling plate; A second manifold, the second manifold being communicated with the second ends of a part of the first cooling plates; A third manifold, the third manifold being communicated with the second ends of the remaining part of the first cooling plates, the two parts of the first cooling plates being arranged alternately along the first direction; and An inlet joint and an outlet joint, the inlet joint being communicated with the second manifold, and the outlet joint being communicated with the third manifold.

5. The battery module according to claim 4, characterized in that, The first manifold, the second manifold and the third manifold are all communicated with the first cooling plate through quick-connect joints, the quick-connect joints including two-way joints and / or three-way joints with a turning angle of 90°, and the first manifold, the second manifold and the third manifold are all located on the side of the first cooling plate adjacent to the battery cells.

6. The battery module according to claim 4, characterized in that, The second manifold and the third manifold are arranged at intervals along the second direction, the battery cell includes a second end face opposite to the first end face, and the second manifold and the third manifold are located between the first end face and the second end face in the third direction.

7. The battery module according to claim 5, wherein, The first cooling plate includes: A plate body, wherein a cooling channel is formed in the plate body and penetrates the plate body along the second direction; a first plug and a second plug, wherein the first plug and the second plug are respectively connected to two ends of the plate body, and the first plug and the second plug respectively close the first end opening and the second end opening of the cooling channel; A first water nozzle and a second water nozzle, the first water nozzle and the second water nozzle are both connected to the wall of the plate body that forms the first cooling surface, the first water nozzle and the second water nozzle are respectively arranged at the first end and the second end of the plate body and are both connected to the cooling flow channel, and the first water nozzle and the second water nozzle are both connected to the quick plug connector.

8. The battery module according to claim 7, wherein The plate body includes a bottom wall, a first side wall, a top wall and a second side wall connected end to end in sequence, the outer surface of the bottom wall forms the first cooling surface, the outer surface of the top wall forms the second cooling surface, and the wall thickness of each of the bottom wall, the first side wall, the top wall and the second side wall is greater than or equal to 0.4 mm.

9. The battery module according to claim 7, wherein The thickness of the wall forming the first cooling surface in the plate body is greater than or equal to 0.8 mm, and at least one of the first plug, the second plug, the first water nozzle, and the second water nozzle is bonded or welded to the plate body.

10. The battery module according to claim 1, wherein, The first cooling surface is bonded to the first end surface of each of the battery cells via thermally conductive adhesive, and / or the second cooling surface is bonded to the busbar via thermally conductive adhesive; wherein, The thermal conductivity of the thermal conductive adhesive is greater than or equal to ≥2W / (m*K), the thixotropy is greater than 4, and the thickness is less than or equal to 0.5mm.

11. The battery module according to claim 2, wherein An insulating layer is provided on a surface of at least one of the first cooling plate and the busbar, and the first cooling plate and the busbar are insulated contact with each other via the insulating layer.

12. The battery module according to claim 11, characterized in that, The thermal conductivity of the insulating layer is greater than or equal to 0.6 W / (m*K), the volume resistivity is greater than or equal to 7e+15Ω*cm, and the thickness is less than or equal to 0.25 mm.

13. The battery module according to claim 1, characterized in that, The second cooling surface is connected to each of the bus bars for heat exchange, the third direction is consistent with the thickness direction of the first cooling plate, the bus bars are connected to the end faces of the poles, the distance between the end faces of the poles and the second cooling surface is 0-6 mm, and the thickness of the first cooling plate is greater than or equal to 3 mm.

14. The battery module according to claim 2, wherein, The busbar includes a first connecting portion, a second connecting portion and a heat dissipation portion. The first connecting portion and the second connecting portion are electrically connected to the poles on different battery cells respectively. The heat dissipation portion is located on the side of the first cooling plate away from the first end surface and is connected to the second cooling surface for heat exchange.

15. The battery module according to claim 14, wherein The busbar comprises a first busbar connecting two adjacent battery cells in the same battery cell group in series and a second busbar connecting two adjacent battery cell groups in series; The heat dissipation portion in the first busbar is connected to at least one of the first connecting portion and the second connecting portion, and the heat dissipation portion is connected to the second cooling surface on one or two adjacent first cooling plates for heat exchange; The heat dissipation portion in the second busbar connects the first connection portion and the second connection portion, and the heat dissipation portion is connected to the second cooling surface on the first cooling plate located between the first connection portion and the second connection portion for heat exchange.

16. The battery module according to claim 1, wherein The pole column includes a positive pole column and a negative pole column arranged at intervals along the first direction; Alternatively, the pole column includes one of a positive pole column and a negative pole column, the battery cell includes a second end face opposite to the first end face, and the other of the positive pole column and the negative pole column is provided on the second end face. The positive pole column and the negative pole column are respectively provided on the first end faces of any two adjacent battery cells in the same battery cell group.

17. The battery module according to claim 1, wherein, The first cooling plate includes a plurality of first cooling plates arranged at intervals along the first direction. The first end face includes a first shoulder and a second shoulder arranged at intervals along the first direction. In any two adjacent columns of the battery cell group, the adjacent first shoulder and the second shoulder are simultaneously heat exchange connected to the first cooling surface of a first cooling plate. In the column of the battery cell group located at the edge, the first shoulder is heat exchange connected to the first cooling surface of a first cooling plate located at the edge. In the other column of the battery cell group located at the edge, the second shoulder is heat exchange connected to the first cooling surface of another first cooling plate located at the edge; wherein, The cross-sectional area of the cooling flow channel in the first cooling plate located at the edge is half of the cross-sectional area of the cooling flow channel in the first cooling plate located in the middle, and / or, the cross-sectional area of the inlet and outlet in the first cooling plate located at the edge is half of the cross-sectional area of the inlet and outlet in the first cooling plate located in the middle.

18. A battery pack, characterized in that, It includes the battery module according to any one of claims 1-17.

19. A vehicle, characterized in that, It includes the battery pack according to claim 18.

Images