Battery module, battery pack, and vehicle

Abstract

Provided in the embodiments of the present disclosure are a battery module, a battery pack, and a vehicle. The battery module comprises cell groups, busbars, and first cooling plates. There are a plurality of columns of cell groups arranged in a first direction, and each cell group comprises a plurality of battery cells arranged in a second direction perpendicular to the first direction. Each battery cell comprises a first end surface and a terminal arranged on the first end surface. A corresponding busbar is electrically connected to the terminal. There are a plurality of first cooling plates arranged at intervals in the first direction. The first end surface of each battery cell is in heat exchange connection with a first cooling surface of at least one first cooling plate. Each busbar is in heat exchange connection with the first cooling surface of at least one first cooling plate and / or a second cooling surface of the first cooling plate. The first cooling plate and the second cooling surface are oppositely arranged in a third direction.

Description

Battery modules, battery packs and vehicles

[0001] This application claims priority to the Chinese patent application with application number 2023116758780, filed with the China Patent Office on December 7, 2023, and application name “Battery module, battery pack and vehicle”, and claims priority to the Chinese patent application with application number 2023233394742, filed with the China Patent Office on December 7, 2023, and application name “Collector for battery pack cooling system, battery pack cooling system and vehicle”, and claims priority to the Chinese patent application with application number 2023116758687, filed with the China Patent Office on December 7, 2023, and application name “Liquid cooling component, battery pack and vehicle”, and claims priority to the Chinese patent application with application number 2023116770049, filed with the China Patent Office on December 7, 2023, and application name “Battery module assembly, battery pack and vehicle”, all of which are incorporated by reference into the application. Technical Field

[0002] The present disclosure relates to the field of vehicle technology, and in particular to a battery module, a battery pack and a vehicle. Background Art

[0003] As electric vehicles gain market share, users are increasingly demanding faster recharging times. The primary approach to improving recharging speeds is high-rate fast charging, which expands the battery cell's charge rate limits, enabling peak charging currents of 5C or higher for the entire pack. This increase in charging current exponentially increases the Joule heating generated by current-carrying components, such as the mechanical components within the battery cell and the busbars within the battery pack.

[0004] In the related technology, a liquid cooling plate is used to dissipate heat from the top of the battery cell where the pole is provided. However, the liquid cooling plate is usually a large plate that is in heat exchange contact with the top of all the battery cells where the pole is provided. This setting allows the liquid cooling plate to only be in heat exchange contact with the bus and the end face of the battery cell where the pole is provided through the lower surface, which results in a small heat exchange area between the liquid cooling plate and the battery cell and the bus, and low heat exchange efficiency, which can easily lead to overheating of the battery cell and limited power, and cannot meet the demand for rapid energy replenishment. Summary of the Invention

[0005] The present disclosure aims to solve one of the technical problems in the related art at least to a certain extent.

[0006] To this end, an embodiment of the present disclosure proposes a battery module, which has the advantages of good heat exchange effect on battery cell poles and bus bars, and stable and efficient energy replenishment speed of the battery cells.

[0007] An embodiment of the present disclosure also provides a battery pack.

[0008] An embodiment of the present disclosure further provides a vehicle.

[0009] According to an embodiment of the present disclosure, the battery module includes a cell group, a bus and a first cooling plate, the cell group has multiple columns and is arranged along a first direction, the cell group includes multiple cells arranged along a second direction, the second direction is perpendicular to the first direction, the cell includes a first end face and a pole arranged on the first end face; the bus is electrically connected to the pole; there are multiple first cooling plates and they are arranged at intervals along the first direction, the first end face of each cell is heat-exchanged with the first cooling surface of at least one first cooling plate, each bus is heat-exchanged with the first cooling surface of at least one first cooling plate and / or the second cooling surface of the first cooling plate, and the first cooling plate and the second cooling surface are arranged opposite to each other along a third direction.

[0010] According to the battery module of the embodiment of the present disclosure, multiple first cooling plates are arranged on the first end face of the battery cell, and are connected to the first end face of each battery cell through the first cooling surface in at least one first cooling plate for heat exchange. At this time, the first cooling plate is adjacent to the pole on the first end face to achieve effective cooling of the pole. At the same time, each busbar can be connected to the first cooling surface in at least one first cooling plate for heat exchange, or it can pass through the gap between two adjacent first cooling plates and be connected to the second cooling surface in at least one first cooling plate for heat exchange. This increases the total heat exchange area between the first cooling plate, the busbar and the battery cell, while also achieving direct cooling of the busbar, thereby allowing the heat generated by the mechanical parts such as the winding tabs in the battery cell to be quickly taken away by the first cooling plate through the first end face and the busbar, effectively avoiding local overheating of the battery module and resulting in limited power of the battery cell, and the energy replenishment of the battery cell is efficient and stable.

[0011] In some embodiments, the first end surface includes a first shoulder and a second shoulder spaced apart along the first direction; wherein, in any two adjacent rows of the battery cell groups, the adjacent first shoulder and second shoulder are simultaneously connected to the first cooling surface of one of the first cooling plates for heat exchange; in a row of the battery cell groups located at the edge, the first shoulder is connected to the first cooling surface of one of the first cooling plates located at the edge for heat exchange; and in another row of the battery cell groups located at the edge, the second shoulder is connected to the first cooling surface of another of the first cooling plates located at the edge for heat exchange;

[0012] In other embodiments, 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 connected to the first cooling surfaces of the corresponding two first cooling plates for heat exchange.

[0013] In other embodiments, the first cooling plate includes a connected liquid cooling portion and an overlapping edge, the liquid cooling portion is attached to the bus bar, and the overlapping edge is attached to the first shoulder and / or the second shoulder of the battery cell.

[0014] In some embodiments, a ratio of an area of ​​the first shoulder to an area of ​​the first end surface is 10%-50%, and a ratio of an area of ​​the second shoulder to an area of ​​the first end surface is 10%-50%.

[0015] In some embodiments, the first cooling plate has a first end and a second end opposite to each other along the second direction, and the battery module further includes a first collector, a second collector, a third collector, a water inlet joint and a water outlet joint, the first collector is connected to the first end of each of the first cooling plates; the second collector is connected to the second end of a portion of the first cooling plates; the third collector is connected to the second end of the remaining first cooling plates, and the two portions of the first cooling plates are alternately arranged along the first direction; the water inlet joint is connected to the second collector, and the water outlet joint is connected to the third collector.

[0016] In some embodiments, the first header, the second header, and the third header are all connected to the first cooling plate through quick-plug connectors, and the first header, the second header, and the third header are all located on a side of the first cooling plate adjacent to the battery cell, and the quick-plug connector includes a two-way connector and / or a three-way connector with a turning angle of 90°.

[0017] In other embodiments, the quick-connect connector includes a main body and a connecting pipe section connected to a liquid cooling pipeline, the main body has a flow channel extending along the second direction, the connecting pipe section is connected to the side of the main body and extends along the second direction and the connecting pipe section is connected to the flow channel.

[0018] In some embodiments, the second current collector and the third current collector are spaced apart along the second direction, the battery cell includes a second end face opposite to the first end face, and the second current collector and the third current collector are located between the first end face and the second end face in the third direction.

[0019] 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, and a cooling channel is formed in the plate body and penetrates the plate body along the second direction; the first plug and the second plug are respectively connected to the 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; 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, and 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 channel, and the first water nozzle and the second water nozzle are both connected to the quick plug connector.

[0020] In some embodiments, 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.

[0021] In some embodiments, 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.

[0022] In some embodiments, the quick-connect connector includes a body and a connecting pipe section connected to a liquid cooling pipeline, the body has a flow channel extending along the second direction, the connecting pipe section is connected to the side of the body and extends along the second direction and the connecting pipe section is connected to the flow channel.

[0023] In some embodiments, the first cooling plate includes a plate body, and the outer wall of the body has a plug interface that cooperates with the first cooling plate, the plug interface is connected to the flow channel, and the central axis of the connecting pipe section is away from the top wall of the body relative to the central axis of the flow channel.

[0024] In some embodiments, the plug-in port penetrates the outer wall of the body along the first direction and has a certain width in the second direction, and the inner bottom surface of the plug-in port is higher than the inner top surface of the connecting pipe section.

[0025] In some embodiments, the side surface of the body connected to the connecting pipe section is a curved surface that is concave in a direction away from the connecting pipe section.

[0026] In some embodiments, the body has a first side surface and a second side surface relative to each other in the second direction, and both the first side surface and the second side surface are provided with a flow channel opening connected to the connecting pipe segment, or one of the first side surface and the second side surface is provided with a flow channel opening connected to the connecting pipe segment.

[0027] In some embodiments, the main body has a plurality of the plug-in ports arranged at intervals in the second direction, and partitions for separating the flow channels are provided between adjacent plug-in ports.

[0028] In some embodiments, the second current collector and the third current collector are spaced apart along the second direction, the battery cell includes a second end face opposite to the first end face, and the second current collector and the third current collector are located between the first end face and the second end face in the third direction.

[0029] In some embodiments, the first cooling surface is bonded to the first end surface of each of the battery cells by means of a thermally conductive adhesive, and / or the second cooling surface is bonded to the busbar by means of a thermally conductive adhesive; wherein,

[0030] 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.

[0031] In some embodiments, 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 through the insulating layer.

[0032] 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.

[0033] 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.

[0034] 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.

[0035] 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;

[0036] 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;

[0037] 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.

[0038] In some embodiments, the poles include positive poles and negative poles spaced apart along the first direction;

[0039] 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.

[0040] In some embodiments, the first cooling plate includes a plurality of first cooling plates spaced apart along the first direction, the first end surface includes a first shoulder and a second shoulder spaced apart along the first direction, in any two adjacent columns of the battery cell groups, the adjacent first shoulders and the second shoulders are simultaneously connected to the first cooling surface of one of the first cooling plates for heat exchange, in a column of the battery cell groups located at the edge, the first shoulder is connected to the first cooling surface of one of the first cooling plates located at the edge for heat exchange, and in another column of the battery cell groups located at the edge, the second shoulder is connected to the first cooling surface of another of the first cooling plates located at the edge for heat exchange; wherein,

[0041] The cross-sectional area of ​​the cooling channel in the first cooling plate located at the edge is half of the cross-sectional area of ​​the cooling channel in the first cooling plate located in the middle, and / or the inlet and outlet cross-sectional areas in the first cooling plate located at the edge are half of the inlet and outlet cross-sectional areas in the first cooling plate located in the middle.

[0042] In some embodiments, the battery module further includes a second cooling plate, a liquid inlet pipe and a liquid outlet pipe, the second cooling plate is arranged on the battery cell group, and the second cooling plate is arranged opposite to the first cooling plate, a first cooling channel is provided in the first cooling plate, and a second cooling channel is provided in the second cooling plate, each of the first cooling channel and the second cooling channel has a cooling medium for cooling the battery cell group, and the liquid inlet pipe, the first cooling plate, the liquid outlet pipe and the second cooling plate are connected in sequence.

[0043] In some embodiments, the second cooling plate has a heat exchange panel and a flow channel panel arranged relatively to each other along the third direction, the heat exchange panel and the flow channel panel form the second cooling flow channel, the area of ​​the heat exchange panel and the fitting area of ​​the battery cell group is S1, the area of ​​the side where the battery cell group is connected to the heat exchange panel is S2, and the ratio of S1 to S2 is 0.1-1.

[0044] In some embodiments, in the third direction, the thickness of the heat exchange panel is D1, the size of the second cooling channel is H1, 0.02≤D1 / H1≤5; the thickness of the channel panel is D2, the size of the second cooling channel is H1, 0.02≤D2 / H1≤5.

[0045] In some embodiments, in the third direction, a thickness of a side of the first cooling plate connected to the bus bar is D3, a size of the second cooling channel is H2, and 0.02≤D3 / H2≤2.

[0046] A battery pack according to an embodiment of the present disclosure includes a battery module as described in any of the above embodiments.

[0047] The technical advantages of the battery pack according to the embodiment of the present disclosure are the same as the technical advantages of the battery module of the above embodiment, and will not be repeated here.

[0048] A vehicle according to an embodiment of the present disclosure includes the battery pack according to the above-described embodiment.

[0049] The technical advantages of the vehicle according to the embodiment of the present disclosure are the same as the technical advantages of the battery pack in the above-mentioned embodiment, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] FIG1 is an isometric view of a battery module according to an embodiment of the present disclosure.

[0051] FIG2 is a top view of a battery module according to an embodiment of the present disclosure.

[0052] FIG3 is a partially enlarged schematic diagram of a battery module at a water inlet joint according to an embodiment of the present disclosure.

[0053] FIG4 is a partially enlarged left side view of the battery module at the first cooling plate according to an embodiment of the present disclosure.

[0054] FIG5 is a partially enlarged schematic diagram of a battery module at a first bus bar according to an embodiment of the present disclosure.

[0055] FIG6 is a partially enlarged schematic diagram of a battery module according to an embodiment of the present disclosure, wherein the battery cell is a blade battery cell.

[0056] FIG7 is another partially enlarged schematic diagram of a battery module according to an embodiment of the present disclosure, wherein the battery cell is a cylindrical battery cell.

[0057] FIG8 is a front view of a battery module according to another embodiment of the present disclosure.

[0058] FIG9 is a perspective view of a battery module according to another embodiment of the present disclosure.

[0059] FIG. 10 is a front view of a first cooling plate according to an embodiment of the present disclosure.

[0060] FIG. 11 is a front view of a second cooling plate according to an embodiment of the present disclosure.

[0061] FIG12 is a perspective view of a battery cell according to one embodiment of the present disclosure.

[0062] FIG13 is a perspective view of a battery cell according to another embodiment of the present disclosure.

[0063] FIG14 is a schematic structural diagram of a battery module according to an embodiment of the present disclosure.

[0064] FIG15 is a schematic diagram of the layout of the liquid cooling circuit of the battery module according to an embodiment of the present disclosure.

[0065] FIG. 16 is a perspective view of a quick-connect connector according to an embodiment of the present disclosure.

[0066] FIG17 is a schematic diagram showing the connection between the quick-connect connector and the flow channel according to an embodiment of the present disclosure.

[0067] 18 is a longitudinal cross-sectional view of a quick-connect connector according to an embodiment of the present disclosure.

[0068] 19 is a transverse cross-sectional view of a quick-connect connector according to another embodiment of the present disclosure.

[0069] 20 is a longitudinal cross-sectional view of a quick-connect connector according to another embodiment of the present disclosure.

[0070] FIG21 is a schematic structural diagram of a quick-connect connector according to an embodiment of the present disclosure.

[0071] FIG22 is a cross-sectional view taken along the EE direction in FIG21 .

[0072] FIG23 is a schematic structural diagram of a quick-connect connector according to another embodiment of the present disclosure, wherein a water nozzle is provided on one side of the manifold.

[0073] FIG24 is a schematic structural diagram of a quick-connect connector according to another embodiment of the present disclosure, wherein the water outlet manifold is provided with an insertion port.

[0074] FIG25 is a schematic structural diagram of a quick-connect connector according to another embodiment of the present disclosure, wherein a plug interface is provided on the current collector.

[0075] Reference numerals: 1, battery cell; 11, first shoulder; 12, second shoulder; 13, pole; 2, first busbar; 21, first connecting portion; 22, second connecting portion; 23, heat dissipation portion; 24, bending portion; 3, second busbar; 4, first cooling plate; 41, plate body; 411, first cooling surface; 412, second cooling surface; liquid cooling portion 401; overlapping edge 402; 42, first plug; 43, first water nozzle; 5, first manifold; 6, second manifold; 7, third manifold; 8, water inlet connector; 9, water outlet connector; 10, quick-connect connector; 101, body; 1011, plug port; 1012, first side surface; 102, connecting pipe section; 103. Partition; 104. Water outlet manifold; 1041. Manifold main; 1042. Insertion port; 1043. Water connection pipe; 105. Flow channel; 20. Water inlet pipe; 201. Water inlet; 30. Water outlet pipe; 40. Return water pipe; 50. Intermediate outflow liquid cooling plate; 60. Edge outflow liquid cooling plate; 70. Intermediate return liquid cooling plate; 80. Edge return liquid cooling plate; 110. Heat dissipation layer; 120. Second cooling plate. DETAILED DESCRIPTION

[0076] The embodiments of the present disclosure are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present disclosure, but should not be understood as limiting the present disclosure.

[0077] The battery module according to an embodiment of the present disclosure is described below with reference to FIG. 1 to FIG. 7 .

[0078] The battery module according to the embodiment of the present disclosure includes a cell group, a busbar and a first cooling plate 4. The cell group has multiple columns and is arranged along a first direction. The cell group includes multiple cells 1 arranged along a second direction. The second direction is perpendicular to the first direction. The cell 1 includes a first end face and a pole 13 provided on the first end face. The busbar is electrically connected to the pole 13. There are multiple first cooling plates 4 and they are arranged at intervals along the first direction. The first end face of each cell 1 is connected to the first cooling surface 411 in at least one first cooling plate 4 for heat exchange. Each busbar is connected to the first cooling surface 411 in at least one first cooling plate 4 and / or the second cooling surface 412 in the first cooling plate 4 for heat exchange. 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.

[0079] According to the battery module of the embodiment of the present disclosure, the first cooling plate 4 is disposed on the first end face of the battery cell 1 and is heat-exchange connected to the first end face of each battery cell 1 through the first cooling surface 411 in 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 be heat-exchange connected to the first cooling surface 411 in at least one first cooling plate 4, or can pass through the gap between two adjacent first cooling plates 4 and be heat-exchange connected to the second cooling surface 412 in 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 wound tabs in 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.

[0080] 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.

[0081] For ease of understanding, the direction indicated by arrow Y in Figure 1 is the second direction of the battery module according to an embodiment of the present disclosure, the direction indicated by arrow X in Figure 1 is the first direction of the battery module according to an embodiment of the present disclosure, and the direction indicated by arrow Z in Figure 1 is the third direction of the battery module according to an embodiment of the present disclosure.

[0082] In some embodiments, the first end surface includes a first shoulder 11 and a second shoulder 12 spaced apart along the first direction.

[0083] As shown in Figures 1-5 and 7, 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 a 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.

[0084] Alternatively, as shown in FIG6 , the number of first cooling plates 4 is twice the number of battery cell groups, with each battery cell group corresponding to two first cooling plates 4 . The first shoulder 11 and second shoulder 12 in each battery cell group are respectively connected to the first cooling surfaces 411 of the two corresponding first cooling plates 4 for heat exchange. In other words, each battery cell group has two independent first cooling plates 4 , resulting in a smaller connection error between the first cooling plates 4 and the first end surfaces of the corresponding battery cells 1 , and a higher connection strength and reliability between the first cooling plates 4 and the corresponding battery cells 1 .

[0085] As shown in FIG6 , a pole 13 is provided on the first end surface. The first shoulder 11 and the second shoulder 12 on both sides of the pole 13 are wider, making it easier to independently equip a first cooling plate 4 .

[0086] The present disclosure is not limited to this. In other embodiments, as shown in Figures 8 and 9, the first cooling plate 4 includes a connected liquid cooling part 401 and an overlapping edge 402, the liquid cooling part 401 is attached to the first bus 2, and the overlapping edge 402 is attached to the shoulder of the battery cell 1.

[0087] The battery module of the disclosed embodiment divides the first cooling plate 4 into a connected liquid cooling portion 401 and an overlapping edge 402. The liquid cooling portion 401 is attached to the first busbar 2, and the overlapping edge 402 is attached to the first shoulder 11 and / or second shoulder 12 of the battery cell 1. The overlapping edge 402 not only dissipates heat from the shoulder of the battery cell 1, but also dissipates heat from the shoulder of the battery cell 1 through the liquid cooling portion 401. This not only helps reduce or even eliminate the temperature difference between the shoulder of the battery cell 1 and the pole 13, but also reduces the overall cooling capacity of the battery cell group. As a result, the battery module further improves the heat dissipation capacity of the battery cell group.

[0088] Specifically, the battery cell group includes a plurality of battery cells 1 arranged along the second direction, and each battery cell 1 has a shoulder. When the positive electrode column and the negative electrode column of the battery cell 1 are both arranged on the first end surface of the battery cell 1, and the positive electrode column and the negative electrode column are arranged near the middle of the battery cell 1, the shoulder can be formed on both sides of the battery cell 1 along the second direction, as shown in Figure 12. When the positive electrode column and the negative electrode column are arranged near the edge of the battery cell 1, the shoulder is formed between the battery cell explosion-proof valve and the positive electrode column, and between the battery cell explosion-proof valve and the negative electrode column. When the positive electrode column and the negative electrode column of the battery cell 1 are relatively arranged at the top and bottom of the battery cell 1. For example, the positive electrode column is arranged in the middle area of ​​the first end surface of the battery cell 1, the shoulder can be formed on both sides of the positive electrode column of the battery cell 1 along the third direction, for example, a blade battery cell 1.

[0089] The first busbar 2 can be welded, screwed, riveted, or bonded to the poles 13 of the cell group using conductive adhesive. Thus, the battery module of the disclosed embodiment has the advantage of high connection convenience. For example, the first busbar 2 connecting the cells can be connected to the poles 13 of the cell 1 using processes such as riveting or laser welding, thereby achieving high-voltage series or parallel connection of the entire cell group.

[0090] Optionally, the first busbar 2 may be a copper alloy first busbar 2 or an aluminum alloy first busbar 2, and an observation hole is provided on the first busbar 2. Furthermore, the first busbar 2 may be formed by stamping, machining or casting.

[0091] Optionally, the first bus 2 and the first cooling plate 4 are connected via various heat-conducting media such as heat-conducting structural adhesive, heat-conducting pad, heat-conducting gel, heat-conducting silicone grease, structural adhesive, etc.

[0092] Optionally, the pole 13 may be square or circular. The pole 13 generally includes a positive pole and a negative pole, which may be arranged on the same side of the battery cell group or opposite to each other.

[0093] In some embodiments, the ratio of the area of ​​the first shoulder 11 to the area of ​​the first end surface is 10%-50%, and the ratio of the area of ​​the second shoulder 12 to the area of ​​the first end surface is 10%-50%.

[0094] The total area of ​​the first shoulder 11 and the second shoulder 12 is also the total contact area between the first cooling plate 4 and the first end face. The contact area within the above range ensures that the first cooling plate 4 has a better cooling effect on the mechanical parts near the pole 13 of the battery cell 1, and can effectively avoid the pole 13 and possible explosion-proof valves and FPC on the first end face, ensuring that the setting of the first cooling plate 4 does not affect the original function of the battery module.

[0095] Specifically, the ratio of the area of ​​the first shoulder 11 to the area of ​​the first end surface is 10%, 30% or 50%, and the ratio of the area of ​​the second shoulder 12 to the area of ​​the first end surface is 10%, 30% or 50%.

[0096] Furthermore, in the second direction, the ratio of the length L1 of the pole 13 to the length L3 of the cell group is 0.1-0.4. This avoids the problem of insufficient safety due to insufficient area on the first end face of the cell 1 to accommodate the required electrical safety distance between the positive and negative poles of the cell 1 when the ratio is too large, and the problem of poor heat exchange efficiency at the top of the cell 1 due to a small ratio when the first end face of the cell 1 is in contact with the first cooling plate 4. Therefore, this battery module combines the advantages of good cooling effect and high structural strength.

[0097] Furthermore, the length L3 of the battery cell group can be 50mm-350mm in width.

[0098] Specifically, the positive electrode column and the negative electrode column of the battery cell 1 are both arranged on the same side of the battery cell 1 , or there may be two or more positive electrode columns and two or more negative electrode columns.

[0099] In the first direction, as shown in Figure 12 , the ratio of the width L2 of the pole 13 to the width L4 of the cell pack is 0.1-0.99. This avoids the problem of poor cooling performance caused by a too small ratio, and also avoids the problem of interference with the installation of the first cooling plate 4 caused by an excessively large ratio. As a result, this battery module combines the advantages of excellent cooling performance with ease of installation.

[0100] In the second direction, the ratio of the length of the first busbar 2 to the length L1 of the terminal 13 is 0.1-5. This avoids both the problem of the first busbar 2 interfering with the installation caused by an excessively large ratio of the length L1 of the first busbar 2 to the terminal 13, and the problem of an excessively small ratio resulting in a small contact surface between the first busbar 2 and the terminal 13, which in turn leads to poor electrical connection or heat exchange efficiency in the battery cell 1. Therefore, this battery module combines the advantages of excellent cooling and high installation convenience.

[0101] The ratio of the length of the first busbar 2 to the length L1 of the pole 13 is 1.5-5. In other words, the length of the first busbar 2 is greater than the length of the pole 13. Furthermore, the first busbar 2 includes a connected overlapping portion and an extended portion. The overlapping portion overlaps the two poles 13 of two adjacent battery cells 1, and the extended portion extends to the shoulder of the battery cell 1.

[0102] In the second direction, the ratio of the length of the liquid cooling part 401 to the length of the first bus 2 is 0.1-2. Thus, the problem of poor cooling effect caused by the ratio of the length of the liquid cooling part 401 to the length of the first bus 2 being too small is avoided. It also avoids the problem of the ratio of the length of the liquid cooling part 401 to the length of the first bus 2 being too large, resulting in a small contact area between the liquid cooling part 401 and the first bus 2, thereby avoiding the advantage of wasting materials at the liquid cooling part 401. Furthermore, the ratio of the length of the liquid cooling part 401 to the length of the first bus 2 can be 1, so that the battery module achieves better results in both cooling efficiency and cost.

[0103] In some embodiments, as shown in Figures 1 and 2, the first cooling plate 4 has a first end and a second end opposite each other along the second direction. The battery module further includes a first header 5, a second header 6, a third header 7, a water inlet connector 8, and a water outlet connector 9. The first header 5 is connected to the first end of each first cooling plate 4, and the second header 6 is connected to the second ends of a portion of the first cooling plates 4. The third header 7 is connected to the second ends of the remaining first cooling plates 4, and the two portions of first cooling plates 4 are arranged alternately along the first direction. The water inlet connector 8 is connected to the second header 6, and the water outlet connector 9 is connected to the third header 7.

[0104] In the cooling condition, the first cooling plate 4 absorbs heat from the battery cells 1 and the bus, and the temperature of the internal coolant will gradually increase along the flow direction. By arranging the first cooling plates 4 connected to the second manifold 6 and the first cooling plates 4 connected to the third manifold 7 alternately 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, thereby making the heat exchange between each battery cell 1 in the same row of battery cells 1 and the two first cooling plates 4 substantially the same, thereby effectively ensuring the temperature uniformity of each battery cell 1 in the same row of battery cells 1.

[0105] For example, the battery cells 1 are arranged in six columns, and there are seven first cooling plates 4 , wherein the second ends of three first cooling plates 4 are connected to the second header 6 , and the second ends of the other four first cooling plates 4 are connected to the third header 7 .

[0106] In some embodiments, the first header 5, the second header 6 and the third header 7 are all connected to the first cooling plate 4 through a quick-connect connector 10, and the quick-connect connector 10 includes a two-way connector and / or a three-way connector with a turning angle of 90°. The first header 5, the second header 6 and the third header 7 are all located on the side of the first cooling plate 4 adjacent to the battery cell 1.

[0107] Each of the first collecting pipe 5, the second collecting pipe 6 and the third collecting pipe 7 is connected to the first cooling plate 4 through a two-way joint and / or a three-way joint with a turning angle of 90°, and the first collecting pipe 5, the second collecting pipe 6 and the third collecting pipe 7 are arranged below the first cooling plate 4, so that the coolant in the first cooling plate 4 can flow downward, so that its flow direction is changed from the second direction to the first direction, which neither occupies the additional space of the battery module in the first direction and the second direction, 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.

[0108] Specifically, among the multiple first cooling plates 4 connected to the second manifold 6, the first cooling plates 4 located at the edge are connected to the second manifold 6 through a two-way joint, and the first cooling plates 4 in the middle are connected to the second manifold 6 through a three-way joint; among the multiple first cooling plates 4 connected to the third manifold 7, the first cooling plates 4 located at the edge are connected to the second manifold 6 through a two-way joint, and the first cooling plates 4 in the middle are connected to the third manifold 7 through a three-way joint.

[0109] In some embodiments, as shown in Figure 2, the second and third current headers 6 and 7 are spaced apart along the second direction. The battery cell 1 includes a second end face opposite the first end face, and the second and third current headers 6 and 7 are positioned between the first and second end faces in the third direction. Compared to arranging the second and third current headers along the third direction, this arrangement not only avoids the need for structural beams in the battery pack, but also effectively prevents the second and third current headers 6 and 7 from being excessively large in the third direction and thus occupying the height dimension of the battery module, further ensuring the required energy density of the battery pack.

[0110] As shown in FIG. 2 , the third current collector 7 is located on a side of the second current collector 6 facing away from the battery cell 1 .

[0111] In some embodiments, as shown in Figure 4, 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 channel is formed in the plate body 41 and passes through the plate body 41 along the second direction. The first plug 42 and the second plug are respectively connected to the two ends of the plate body 41, and the first plug 42 and the second plug respectively close the first end opening and the second end opening of the cooling channel. The first water nozzle 43 and the second water nozzle are both 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 connected to the cooling channel. The first water nozzle 43 and the second water nozzle are both connected to the quick connector 10.

[0112] The first water nozzle 43 and the second water nozzle are connected below the plate 41 so that the first water nozzle 43 and the second water nozzle do not occupy the height dimension of the battery module. The plate 41 can be formed by an extrusion process, which is easy to process and low in cost.

[0113] In some embodiments, the plate body 41 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 a first cooling surface 411, the outer surface of the top wall forms a second cooling surface 412, 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.

[0114] This setting enables the plate body 41 to be processed and formed using an extrusion process, and the wall thickness of each of the bottom wall, first side wall, top wall and second side wall can also be designed to be 0.4 mm to minimize the space occupied in the height direction and further ensure the energy density requirements of the battery pack.

[0115] For example, the plate body 41 is made of 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.

[0116] In some embodiments, the thickness of the wall forming the first cooling surface 411 in the plate body 41 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 bonded or welded to the plate body 41 .

[0117] That is, the wall thickness of the bottom wall is greater than or equal to 0.8 mm. Under 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 rhythm and airtight reliability, and also minimize the space occupied by the plate body 41 in the height direction.

[0118] In some embodiments, the second cooling surface 412 is connected to each bus for heat exchange, the third direction is consistent with the thickness direction of the first cooling plate 4, the bus is connected to the end face of the pole 13, the distance between the end face of the pole 13 and the second cooling surface 412 is 0-6mm, and the thickness of the first cooling plate 4 is greater than or equal to 3mm.

[0119] The thickness of the first cooling plate 4 is greater than or equal to 3mm, ensuring sufficient cross-sectional area for the cooling channel within it. This ensures that the internal flow resistance of the first cooling plate 4 is not excessively high, thus meeting the flow requirements of the entire battery pack. Furthermore, when the second cooling surface of the first cooling plate 4 is higher than the end surface of the pole 13, the difference between the two is no more than 6mm. This further reduces the height space occupied by the first cooling plate 4 in the battery module, ensuring the required energy density of the entire battery pack.

[0120] Specifically, at least part of the bus is located above the first cooling plate 4 and is connected to the second cooling surface 412 for heat exchange. At this time, the part of the bus located above the first cooling plate 4 can be bent upward or downward relative to the other part, and the bus can also be a straight plate, specifically, the second cooling surface 412 of the first cooling plate 4 is higher or lower than the end face of the pole 13 or is coplanar with the end face of the pole 13.

[0121] In this embodiment, as shown in Figures 14 to 25, the structure of the quick-connect connector 10 is not limited to this. In other embodiments, the quick-connect connector 10 includes a main body 101 and a connecting pipe section connected to the liquid cooling pipeline. The main body 101 has a flow channel 105 extending along the second direction. The connecting pipe section is connected to the side of the main body 101 and extends along the second direction. The connecting pipe section is connected to the flow channel 105.

[0122] Specifically, as shown in Figures 16 and 17, the main body 101 has a flow channel 105 extending along the second direction (Y direction in Figure 16), the connecting pipe section 102 is connected to the side of the main body 101 and extends along the second direction and the connecting pipe section 102 is connected to the flow channel 105, and the outer wall of the main body 101 has a plug interface 1011 that cooperates with the first cooling plate 4, the plug interface 1011 is connected to the flow channel 105, and the central axis of the connecting pipe section 102 is away from the top wall of the main body 101 relative to the central axis of the flow channel 105.

[0123] It can be understood that the battery cells 1 in the battery pack are usually arranged in a modular array, and the first cooling plates 4 are arranged in multiple arrangements according to the layout of the battery cells 1. The multiple first cooling plates 4 can be connected to the cooling water input by the liquid cooling pipeline through the quick-plug connector 10 to optimize the layout of the cooling system. The quick-plug connector 10 in the present application can make the connecting pipe section 102 eccentrically arranged relative to the main body 101 by setting the central axis of the connecting pipe section 102 lower than the central axis of the main body 101. Taking the first cooling plate 4 attached to the top wall of the battery cell 1 as an example, since the connecting pipe section 102 is relatively eccentrically arranged downward If the connecting pipe section 102 is arranged eccentrically downward, the space occupied by the connecting pipe section 102 in the Z direction (the height direction of the battery cell 1) at least partially overlaps with the fixed assembly space of the battery cell 1, and the liquid cooling pipeline connected to the connecting pipe section 102 will not occupy the space on both sides of the battery cell 1 in the Z direction, thereby reducing the space occupied by the entire battery module, especially for the space between the top cover and the battery cell 1. Since the connecting pipe section 102 is eccentrically arranged downward, the top wall height of the liquid cooling pipeline will not exceed the top wall height of the main body 101, thereby not occupying the space between the top cover and the battery cell 1, thereby making the volume of the entire battery pack more compact.

[0124] Accordingly, by eccentrically setting the connecting pipe section 102, the inner top surface of the connecting pipe section 102 can be made lower than the top wall of the main body 101, and the top wall of the liquid cooling pipeline connected to the connecting pipe section 102 will not exceed the top wall of the main body 101, thereby avoiding the liquid cooling pipeline occupying the space on both sides of the battery cell 1 in the Z direction, so as to reduce the volume of the battery pack liquid cooling system, improve the compactness of the structure, reduce the installation space occupied, and improve the vehicle space utilization rate.

[0125] Optionally, when the first cooling plate 4 is assembled on the bottom wall of the battery cell 1 , the quick connector 10 can be assembled upside down so that the central axis of the connecting pipe section 102 is higher than the central axis of the body 101 to prevent the liquid cooling pipeline from protruding from the bottom surface of the battery cell 1 .

[0126] According to the quick-connect connector 10 of the embodiment of the present invention, the main body 101 has a flow channel 105 extending along the second direction, the connecting pipe section 102 is connected to the side of the main body 101 and extends along the second direction and the connecting pipe section 102 is communicated with the flow channel 105, and the outer wall of the main body 101 has a plug port 1011 that cooperates with the first cooling plate 4, the plug port 1011 is communicated with the flow channel 105, and the central axis of the connecting pipe section 102 is away from the top wall of the main body 101 relative to the central axis of the flow channel 105. Therefore, by eccentrically setting the connecting pipe section 102, the inner top surface of the connecting pipe section 102 can be made lower than the top wall of the main body 101, and the top wall of the liquid cooling pipeline connected to the connecting pipe section 102 will not exceed the top wall of the main body 101, thereby avoiding the liquid cooling pipeline occupying the space on both sides of the battery cell 1 in the Z direction, so as to reduce the overall volume of the liquid cooling system, improve the compactness of the structure, and reduce the installation space occupied.

[0127] Preferably, as shown in FIG15 , the plug port 1011 extends through the outer wall of the body 101 along a first direction (the X direction in FIG16 ) and has a certain width in a second direction, with the first direction being perpendicular to the second direction. Thus, the quick-connect connector 10 can be vertically plugged into the first cooling plate 4 , providing a reliable connection. The layout of the liquid cooling line can also match the matrix arrangement of the battery cells 1 , resulting in a compact structure.

[0128] Furthermore, as shown in FIG17 , the inner bottom surface of the plug-in port 1011 is higher than the inner top surface of the connecting pipe section 102. Thus, the first cooling plate 4 and the connecting pipe section 102 are staggered in the Z direction. The connecting pipe section 102 can be arranged on both sides of the plug-in port 1011 according to layout requirements, or it can be arranged below the plug-in port 1011 to reduce the overall length of the quick connector 10 and save space in the Y direction.

[0129] Preferably, the side surface of the body 101 connected to the connecting pipe section 102 is a curved surface that is concave in the direction away from the connecting pipe section 102. Thus, the end of the connecting pipe section 102 can be brought closer to the plug-in port 1011 while the plug-in port 1011 wraps around the first cooling plate 4, further saving space in the Y direction.

[0130] Preferably, the connecting pipe section 102 is integrally processed with the main body 101 , and there is no need to reserve a supporting area on the side of the main body 101 for welding the connecting pipe section 102 , thereby saving space and reducing welding costs.

[0131] Optionally, as shown in Figures 16, 18, 19, and 20, the body 101 has a first side surface 1012 and a second side surface that are opposite each other in the second direction, and both the first side surface 1012 and the second side surface are provided with a flow channel 105 opening connected to the connecting pipe section 102. It should be noted that the first cooling plates 4 are typically arranged in multiple rows at intervals in the arrangement direction of the battery cells 1. In this case, the current collector assembled with the first cooling plates 4 in the central region needs to be connected to the liquid cooling pipeline on both sides. Therefore, the connection pipe section 102 is provided on both the first side surface 1012 and the second side surface to meet specific application requirements.

[0132] Optionally, as shown in Figures 23-25 ​​, one of the first side surface 1012 and the second side surface is provided with a flow channel 105 opening for connecting to the connecting pipe segment 102. It is understood that since there are no other first cooling plates 4 outside the edge-positioned first cooling plates 4 that need to be connected, the quick-connect connectors 10 connected to the edge-positioned first cooling plates 4 only need to have the connecting pipe segment 102 on the inner end surface to meet the requirement; the other side can be a solid wall. Specifically, as shown in Figure 15 , the quick-connect connectors 10 at the edge corners are all manifolds with an opening on one side.

[0133] Preferably, as shown in Figure 16, the body 101 has a plurality of spaced-apart plug ports 1011 in the second direction. Thus, one quick connector 10 can be connected to a plurality of first cooling plates 4 at the same time, reducing the number of components and optimizing the layout of the liquid cooling system.

[0134] Optionally, as shown in Figures 19 and 20, a partition 103 is provided between adjacent plug ports 1011 to separate the flow channel 105. It is understood that after the coolant in the first cooling plate 4 is discharged from the outlet and enters the quick-connect connector 10, the quick-connect connector 10 will flow toward the quick-connect connectors 10 on both sides through the liquid cooling pipeline and eventually flow into the first cooling plates 4 on both sides for reflux. By providing a partition 103 between the two plug ports 1011, the flow channel 105 can be divided into two symmetrical chambers, thereby allowing the quick-connect connector 10 to be evenly supplied with liquid on both sides, avoiding the problem of uneven heat dissipation. It can be understood that whether a partition 103 is set between the plug ports 1011 depends on the specific application position of the quick-connect connector 10. For example, when the quick-connect connector 10 is used on the water supply side, the partition 103 may not be set between the plug ports 1011, so that the quick-connect connector 10 and the liquid cooling pipeline form a total passage, and only one water inlet 201 needs to be set to complete the liquid supply. When used on the water outlet side of the first cooling plate 4 for reflux liquid distribution, the partition 103 can be optionally set to ensure the uniformity of the liquid distribution.

[0135] Optionally, the number of the plug ports 1011 can be multiple or single, depending on the assembly requirements of the first cooling plate 4. As shown in Figure 15, each group of the intermediate outbound liquid cooling plates 50 includes two liquid cooling plates, and the number of the plug ports 1011 can be set to two (as shown in Figure 16). The number of the edge return liquid cooling plates 80 is one, and the number of the plug ports 1011 is also set to one (as shown in Figure 25).

[0136] According to an embodiment of the present disclosure, the battery module includes the quick-connect connector 10 of the above embodiment, and the battery module includes a battery cell 1, multiple liquid cooling plates and a liquid cooling pipeline. The liquid cooling plate is in contact with the battery cell 1 and its end is plugged into the plug port 1011. The liquid cooling pipeline is connected to the connecting pipe section 102, and the multiple liquid cooling plates are arranged at intervals in the arrangement direction of the battery cell 1.

[0137] Specifically, taking Figures 14 and 15 as an example, the battery cells 1 are arranged in a rectangular shape, and adjacent battery cells 1 are connected by a first bus 2. A plurality of liquid cooling plates extend along the X direction and are arranged at intervals in the Y direction. The liquid cooling pipeline includes an inlet pipe 20, a return pipe 40, and an outlet pipe 30. The inlet pipe 20 and the outlet pipe 30 are arranged at the same end of the liquid cooling plate and extend along the arrangement direction of the liquid cooling plate (the X direction in Figure 14). The return pipe 40 is arranged at the other end of the liquid cooling plate and extends along the arrangement direction of the liquid cooling plate. The water inlet pipe 20 and the water return pipe 40 are both connected to a quick-connect connector 10, and the water outlet pipe 30 is connected to a water outlet collector 104. The water outlet collector 104 includes a communicating collecting main pipe 1041 and a water receiving pipe 1043. The collecting main pipe 1041 has a plug-in port 1042 that cooperates with the liquid cooling plate. The water receiving pipe 1043 is connected to the collecting main pipe 1041 and is arranged along the height direction of the battery cell 1 (the Z direction in FIG14 ), and the water outlet pipe is connected to the water receiving pipe 1043.

[0138] Specifically, as shown in Figure 15, the first cooling plate 4 includes three groups of outbound liquid cooling plates and four groups of return liquid cooling plates, wherein each group of outbound liquid cooling plates includes two liquid cooling plates, and each group of outbound liquid cooling plates is respectively equipped with a quick-connect connector 10 with two plug-in ports 1011 at both ends. The quick-connect connectors 10 located at the left end of the outbound liquid cooling plate are connected by a water inlet pipe 20 and no partition 103 is set between the two plug-in ports 1011. The quick-connect connectors 10 located at the right end of the outbound liquid cooling plate are connected by a water outlet pipe 30 and a partition 103 is set between the two plug-in ports 1011.

[0139] Furthermore, as shown in Figure 15, the three groups of outbound liquid cooling plates include a group of intermediate outbound liquid cooling plates 50 and two groups of edge outbound liquid cooling plates 60. The quick-connect connectors 10 corresponding to the intermediate outbound liquid cooling plates 50 are provided with connecting pipe sections 102 on both sides, and the quick-connect connectors 10 corresponding to the edge outbound liquid cooling plates 60 are only provided with connecting pipe sections 102 on the side facing the middle part position, and the other side is a solid wall.

[0140] As shown in Figure 15, the four groups of return liquid cooling plates include two groups of intermediate return liquid cooling plates 70 and two groups of edge return liquid cooling plates 80, wherein the two groups of intermediate return liquid cooling plates 70 are located on both sides of the intermediate outbound liquid cooling plates 50, and the two groups of edge return liquid cooling plates 80 are respectively located on the outside of the two groups of edge outbound liquid cooling plates 60, and the quick-connect connector 10 corresponding to the right end of the return liquid cooling plate and the quick-connect connector 10 corresponding to the right end of the outbound liquid cooling plate are connected through the return water pipe 40.

[0141] Furthermore, a partition 103 is provided between the two plug interfaces 1011 of the quick connector 10 located at the right end of the edge return liquid cooling plate 80 to facilitate uniform liquid supply to the return liquid cooling plates on both sides. The collector located at the left end of the edge return liquid cooling plate 80 is the water outlet collector 104. The vertically arranged water pipe 1043 can separate the setting of the water outlet pipe 30 from the water inlet pipe 20 in the Z direction, thereby avoiding assembly interference.

[0142] Specifically, the water outlet collector 104 can be provided with an insertion port 1042 (as shown in FIG. 24 ) to cooperate with the left end of the edge return liquid cooling plate 80 , or two insertion ports 1042 can be provided (as shown in FIG. 21 and FIG. 22 ) to cooperate with the left end of the middle return liquid cooling plate 70 .

[0143] According to the battery module of the embodiment of the present disclosure, by adopting the above-mentioned quick-plug connector 10, the main body 101 has a flow channel 105 extending along the second direction, the connecting pipe section 102 is connected to the side of the main body 101 and extends along the second direction and the connecting pipe section 102 is connected to the flow channel 105, and the outer wall of the main body 101 has a plug port 1011 that cooperates with the first cooling plate 4, the plug port 1011 is connected to the flow channel 105, and the central axis of the connecting pipe section 102 is away from the top wall of the main body 101 relative to the central axis of the flow channel 105. Therefore, by eccentrically setting the connecting pipe section 102, the inner top surface of the connecting pipe section 102 can be made lower than the top wall of the main body 101, and the top wall of the liquid cooling pipeline connected to the connecting pipe section 102 will not exceed the top wall of the main body 101, thereby avoiding the liquid cooling pipeline occupying the space on both sides of the battery cell 1 in the Z direction, so as to reduce the volume of the battery pack, improve the compactness of the structure, and reduce the installation space occupied.

[0144] In some embodiments, as shown in FIG4 , the first cooling surface 411 is bonded to the first end face of each battery cell 1 via thermally conductive adhesive, and / or the second cooling surface 412 is bonded to the busbar via thermally conductive adhesive. This ensures reliable cooling of the battery cells 1 and the busbar by the first cooling plate 4.

[0145] When the bottom of each battery cell 1 is bonded together by the second cooling plate 120, the bonding of the first cooling plate 4 to each battery cell 1 also provides sufficient restraint for the top of each battery cell 1, effectively avoiding the battery cell 1 being skewed due to inconsistent restraint forces at the bottom and top of the battery cell 1, and further pulling the pole 13 to cause the battery cell 1 to leak.

[0146] Specifically, the thermally conductive adhesive can be a thermally conductive structural adhesive, double-sided adhesive, or other adhesive with sufficient bonding strength. The thermal conductivity of the thermally conductive adhesive is greater than or equal to ≥2W / (m*K), and the thixotropy is greater than 4. In this way, the thermally conductive adhesive can meet the thermal conductivity requirements and bonding strength requirements while also limiting its thickness to less than 0.5mm, further reducing the space occupied by the thermally conductive adhesive in the height direction of the battery module.

[0147] In some embodiments, an insulating layer is provided on a 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 insulated contact with each other through the insulating layer.

[0148] Insulating the first cooling plate 4 and the busbars can improve the safety between the busbars and ensure that the battery module circuit is stable and reliable.

[0149] Specifically, the insulating layer can be fixed on the surface 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. Meanwhile, the surface of the busbar welded to the pole 13 is not insulated.

[0150] In some embodiments, the insulation layer has a thermal conductivity greater than or equal to 0.6 W / (m*K), a volume resistivity greater than or equal to 7e+15 Ω*cm, and a thickness less than or equal to 0.25 mm. This configuration ensures insulation strength without increasing the thermal resistance of the insulation layer due to excessive thickness, effectively improving the heat exchange efficiency between the busbar and battery cell 1 and the first cooling plate 4.

[0151] In some embodiments, as shown in Figures 4 to 7, 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 electrically connected to the poles 13 on different battery cells 1, respectively. The heat dissipation portion 23 is located on the side of the first cooling plate 4 away from the first end face and is connected to the second cooling surface 412 for heat exchange.

[0152] The busbar is connected to the first cooling plate 4 for heat exchange via the extended heat dissipation portion 23, thereby cooling the first connection portion 21 and the second connection portion 22 of the busbar. In this case, the heat dissipation portion 23 can avoid the first cooling plate 4 and be located above it, while also being able to contact the second cooling surface 412, thereby reducing the stress caused by the flatness of the contact surface.

[0153] Specifically, as shown in Figures 1-3, the busbar includes a first busbar 2 that connects two adjacent battery cells 1 in the same battery cell group in series, and a second busbar 3 that connects two adjacent battery cell groups in series. The heat dissipation portion 23 in the first busbar 2 is connected to at least one of the first connecting portion 21 and the second connecting portion 22, and the heat dissipation portion 23 is connected to the second cooling surface 412 on one or two adjacent first cooling plates 4 for heat exchange. The heat dissipation portion 23 in the second busbar 3 is connected to the first connecting portion 21 and the second connecting portion 22, and the heat dissipation portion 23 is connected to the second cooling surface 412 on the first cooling plate 4 located between the first connecting portion 21 and the second connecting portion 22 for heat exchange.

[0154] In some embodiments, as shown in FIG. 5 , the first busbar 2 further includes a bent portion 24 connecting the first connection portion 21 and the second connection portion 22 . The bent portion 24 is bent toward the third direction to form a groove extending along the first direction.

[0155] Therefore, when the battery cell 1 expands and causes the pole 13 to be pulled by the busbar, the busbar can be stretched to a certain extent as the bent portion 24 deforms, thereby preventing the pole 13 of the battery cell 1 from being overstressed and leaking.

[0156] In some embodiments, the battery module further includes a second cooling plate 120 , the battery cell 1 includes a second end surface opposite to the first end surface, and the second cooling plate 120 is electrically connected to the second end surface of each battery cell 1 .

[0157] At this time, as shown in Figures 1 to 5 and 7, the pole 13 may include a positive pole and a negative pole arranged at intervals along the first direction. Alternatively, as shown in Figure 6, the pole 13 may include one of the positive pole and the negative pole, the second end face is provided with the other of the positive pole and the negative pole, and any two adjacent battery cells 1 in the same battery cell group are provided with a positive pole and a negative pole on their first end faces, respectively. Any of the above-mentioned arrangements of the battery cells 1, and not limited to the blade battery cells 1 and the cylindrical battery cells 1, can achieve cooling of the battery cells 1 at the position of the pole 13 through the first cooling plate 4 to ensure the rapid energy replenishment requirements of the battery module.

[0158] It should be noted that the number of columns of the cell group and the number of cells 1 in the cell group can be flexibly designed according to the required power and voltage. The total number of cells 1 can be 160-220, so that the battery module meets the use requirements of most moldings.

[0159] In some embodiments, when the number of first cooling plates 4 exceeds the number of rows of battery cell groups by one, the cross-sectional area of ​​the cooling channels in the first cooling plates 4 located at the edges is half that of the cooling channels in the first cooling plates 4 located in the middle, and / or the inlet and outlet cross-sectional areas of the first cooling plates 4 located at the edges are half that of the inlet and outlet cross-sectional areas of the first cooling plates 4 located in the middle. This ensures that the flow rate in the first cooling plates 4 located at the edges is half that 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, further ensuring the temperature uniformity requirement of each battery cell 1.

[0160] As shown in Figures 8 to 13, the battery module of the present disclosure also includes a second cooling plate 120, a liquid inlet pipe and a liquid outlet pipe. The second cooling plate 120 is arranged on the battery cell group, and the second cooling plate 120 is arranged opposite to the first cooling plate. A first cooling channel is provided in the first cooling plate, and a second cooling channel is provided in the second cooling plate 120. Each of the first cooling channel and the second cooling channel has a cooling medium for cooling the battery cell group, and the liquid inlet pipe, the first cooling plate, the liquid outlet pipe and the second cooling plate 120 are connected in sequence.

[0161] The battery module of the disclosed embodiment can cool the other side of the battery cell group by providing a second cooling plate 1204 on the side of the battery cell group opposite to the first cooling plate 4. Thus, the battery module further improves the heat dissipation effect and uniformity of the battery cell group.

[0162] The battery module of the disclosed embodiment, by providing a first cooling channel 311 within the first cooling plate 4 and a second cooling channel 41 within the second cooling plate 1204, controls the flow path of the cooling medium, thereby extending the time the cooling medium flows through the liquid cooling plates (first cooling plate 4 and second cooling plate 120), thereby improving the cooling effect of the liquid cooling plates. As a result, the battery module improves the heat dissipation effect of the battery cell group.

[0163] Optionally, the first cooling plate 4 and the second cooling plate 120 may be in the form of harmonica tubes or may be stamped and brazed.

[0164] Optionally, there may be multiple first cooling plates 4, which may be connected in parallel and / or in series before being connected to the second cooling plate 120. Furthermore, the second cooling plate 120 may be a plate structure having a liquid cavity, with a liquid outlet and a liquid inlet. The battery cell group 200 may include multiple battery cell groups arranged in rows, each battery cell group having two shoulders, each of which is provided with a corresponding first cooling plate 4. Multiple first cooling plates 4 may be connected in series or in parallel to form a single unit before being connected to the second cooling plate 120.

[0165] As shown in Figure 11, the second cooling plate 120 has a heat exchange panel and a flow channel panel positioned opposite each other along the third direction. These panels form a second cooling channel. The area of ​​the heat exchange panel and the cell pack is S1, and the area of ​​the cell pack connected to the heat exchange panel is S2. The ratio of S1 to S2 is 0.1-1. This avoids the problem of poor cooling effect caused by the small heat exchange area of ​​the second cooling plate 120, while also preventing the problem of an overly large heat exchange panel 42 occupying the internal space of the battery pack 1000.

[0166] As shown in FIG11 , in the third direction, the thickness of the heat exchange panel is D1, the size of the second cooling channel is H1, 0.02≤D1 / H1≤5; the thickness of the channel panel is D2, the size of the second cooling channel is H1, 0.02≤D2 / H1≤5.

[0167] As a result, the battery module avoids the problem of poor cooling effect caused by excessive thickness of the heat exchange panel 42 and / or the flow channel panel 43 occupying the space of the second cooling channel 41, while also avoiding the problem of weak structural strength caused by excessive thickness of the heat exchange panel 42 and / or the flow channel panel 43. Therefore, the battery module has the advantages of both good cooling effect and high structural strength.

[0168] Alternatively, the heat exchange panel 42 may be a flat plate, and the flow channel panel 43 may be a corrugated plate. The heat exchange panel 42 and the flow channel panel 43 may be formed into the second cooling plate 120 by stamping, brazing, or inflation. The second cooling plate 120 may also be a harmonica tube or an aluminum profile tube.

[0169] Optionally, in order to ensure the connection strength between the second cooling plate 120 and the battery cell group and further improve the cooling effect between the second cooling plate 120 and the battery cell group, heat conduction can be increased between the second cooling plate 120 and the battery cell group through various heat exchange media such as thermal pads, thermal adhesives, structural adhesives, double-sided adhesives, etc.

[0170] In the third direction, the thickness of the first cooling plate on the side where it connects to the busbar is D3, and the dimension of the second cooling channel is H2, where 0.02 ≤ D3 / H2 ≤ 2. This battery module thus avoids both the problem of poor cooling efficiency caused by an overly thick first cooling plate 4 occupying space in the second cooling channel 41, and the problem of weak structural strength caused by an undersized first cooling plate 4. Consequently, this battery module combines the advantages of excellent cooling efficiency with high structural strength.

[0171] A battery pack according to an embodiment of the present disclosure includes a battery module as described in any of the above embodiments.

[0172] The technical advantages of the battery pack according to the embodiment of the present disclosure are the same as the technical advantages of the battery module of the above embodiment, and will not be repeated here.

[0173] A vehicle according to an embodiment of the present disclosure includes the battery pack according to the above-described embodiment.

[0174] The technical advantages of the vehicle according to the embodiment of the present disclosure are the same as the technical advantages of the battery pack in the above-mentioned embodiment, and will not be repeated here.

[0175] In the description of the present disclosure, 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 disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation to the present disclosure.

[0176] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. Throughout the present disclosure, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0177] In this disclosure, unless otherwise expressly specified or limited, terms such as "mounted," "connected," "connect," and "fixed" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integration; mechanical connections, electrical connections, or communication between them; direct connections or indirect connections through an intermediate medium; and internal communication between two elements or interaction between two elements, unless otherwise expressly limited. Those skilled in the art will understand the specific meanings of the above terms in this disclosure based on specific circumstances.

[0178] In the present disclosure, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0179] In the present disclosure, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" mean 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 present disclosure. In this specification, the schematic expressions 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 any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0180] Although the above embodiments have been shown and described, it is understood that the above embodiments are illustrative and are not to be construed as limitations on the present disclosure. Changes, modifications, substitutions and variations of the above embodiments by those skilled in the art are all within the scope of protection of the present disclosure.

Claims

1. A battery module, characterized in that: include: A battery cell group, wherein 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, the second direction is arranged perpendicular to the first direction, and the battery cell includes a first end surface and a pole arranged on the first end surface; A busbar, the busbar being electrically connected to the pole; and A first cooling plate, wherein the first cooling plates are provided in plurality and are arranged at intervals along the first direction, the first end surface of each of the battery cells is heat exchangeably connected to a first cooling surface of at least one of the first cooling plates, each of the bus bars is heat exchangeably connected to the first cooling surface of at least one of the first cooling plates and / or the second cooling surface of the first cooling plate, and the first cooling plate and the second cooling surface are arranged opposite to each other along a third direction.

2. The battery module according to claim 1, characterized in that: The first end surface 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 groups, the adjacent first shoulder and the second shoulder are simultaneously connected to the first cooling surface of one of the first cooling plates for heat exchange; in a column of the battery cell groups located at the edge, the first shoulder is connected to the first cooling surface of one of the first cooling plates located at the edge for heat exchange; in another column of the battery cell groups located at the edge, the second shoulder is connected to the first cooling surface of another of the first cooling plates located at the edge for heat exchange; Alternatively, 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 connected to the first cooling surfaces of the corresponding two first cooling plates for heat exchange; Alternatively, the first cooling plate includes a connected liquid cooling portion and an overlapping edge, the liquid cooling portion is attached to the bus bar, and the overlapping edge is attached to the first shoulder and / or the second shoulder of the battery cell.

3. The battery module according to claim 2, characterized in that: The ratio of the area of ​​the first shoulder to the area of ​​the first end surface is 10%-50%, and the ratio of the area of ​​the second shoulder to the area of ​​the first end surface is 10%-50%.

4. The battery module according to claim 2, characterized in that: The first cooling plate has a first end and a second end opposite to each other along the second direction, and the battery module further comprises: a first header, the first header being in communication with a first end of each of the first cooling plates; a second header, the second header being in communication with a second end of a portion of the first cooling plate; a third header, the third header being connected to the second ends of the remaining first cooling plates, the two first cooling plates being alternately arranged along the first direction; and A water inlet joint and a water outlet joint, wherein the water inlet joint is connected to the second manifold, and the water outlet joint is connected to the third manifold.

5. The battery module according to claim 4, characterized in that: The first header, the second header and the third header are all connected to the first cooling plate through quick-plug connectors, the first header, the second header and the third header are all located on a side of the first cooling plate adjacent to the battery core, and the quick-plug connector includes a two-way connector and / or a three-way connector with a turning angle of 90°; Alternatively, the quick-plug connector includes a body and a connecting pipe section connected to a liquid cooling pipeline, the body has a flow channel extending along the second direction, the connecting pipe section is connected to the side of the body and extends along the second direction and the connecting pipe section is connected to the flow channel.

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

7. The battery module according to claim 5, characterized in that: The first cooling plate comprises: 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 a first end opening and a 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 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 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, characterized in that: The plate body includes a bottom wall, a first side wall, a top wall and a second side wall which are 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, characterized in that: 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 5, characterized in that: The first cooling plate includes a plate body, and an insertion port that cooperates with the first cooling plate is provided on the outer wall of the body. The insertion port is connected to the flow channel, and the central axis of the connecting pipe section is away from the top wall of the body relative to the central axis of the flow channel.

11. The battery module according to claim 10, characterized in that: The insertion opening penetrates the outer wall of the body along the first direction and has a certain width in the second direction, and the inner bottom surface of the insertion opening is higher than the inner top surface of the connecting pipe section.

12. The battery module according to claim 10, characterized in that: The side surface of the main body connected to the connecting pipe section is a curved surface that is concave in a direction away from the connecting pipe section.

13. The battery module according to claim 10, characterized in that: The body has a first side surface and a second side surface opposite to each other in the second direction, and the first side surface and the second side surface are both provided with a flow channel opening connected to the connecting pipe section, or one of the first side surface and the second side surface is provided with a flow channel opening connected to the connecting pipe section.

14. The battery module according to claim 10, characterized in that: The main body has a plurality of the plugging ports arranged at intervals in the second direction, and partitions for separating the flow channels are arranged between adjacent plugging ports.

15. The battery module according to claim 10, characterized in that: The second current collector and the third current collector are arranged at intervals along the second direction, the battery cell includes a second end surface opposite to the first end surface, and the second current collector and the third current collector are located between the first end surface and the second end surface in the third direction.

16. The battery module according to claim 1, characterized in that: The first cooling surface is bonded to the first end surface of each of the battery cells by means of a thermally conductive adhesive, and / or the second cooling surface is bonded to the busbar by means of a thermally conductive adhesive; wherein, The thermal conductivity of the thermally 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.

17. The battery module according to claim 2, characterized in that: 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 in insulated contact with each other through the insulating layer.

18. The battery module according to claim 17, 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.

19. 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 0-6mm, and the thickness of the first cooling plate is greater than or equal to 3mm.

20. The battery module according to claim 2, characterized in that: 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 surface and is connected to the second cooling surface for heat exchange.

21. The battery module according to claim 20, characterized in that: 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 connection portion and the second connection 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.

22. The battery module according to claim 1, characterized in that: The poles include positive poles and negative poles arranged at intervals along the first direction; Alternatively, the electrode column includes one of a positive electrode column and a negative electrode column, 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 column and the negative electrode column, and the first end faces of any adjacent two battery cells in the same battery cell group are respectively provided with the positive electrode column and the negative electrode column.

23. The battery module according to claim 1, characterized in that: The first cooling plate includes a plurality of first cooling plates arranged at intervals along the first direction, the first end surface 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 connected to the first cooling surface of one of the first cooling plates for heat exchange, in a column of the battery cell groups located at the edge, the first shoulder is connected to the first cooling surface of one of the first cooling plates located at the edge for heat exchange, and in another column of the battery cell groups located at the edge, the second shoulder is connected to the first cooling surface of another of the first cooling plates located at the edge for heat exchange; wherein, The cross-sectional area of ​​the cooling channel in the first cooling plate located at the edge is half of the cross-sectional area of ​​the cooling channel in the first cooling plate located in the middle, and / or the inlet and outlet cross-sectional areas in the first cooling plate located at the edge are half of the inlet and outlet cross-sectional areas in the first cooling plate located in the middle.

24. The battery module according to claim 1, characterized in that: It also includes a second cooling plate, a liquid inlet pipe and a liquid outlet pipe, the second cooling plate is arranged on the battery cell group, and the second cooling plate is arranged opposite to the first cooling plate, the first cooling plate is provided with a first cooling channel, the second cooling plate is provided with a second cooling channel, each of the first cooling channel and the second cooling channel has a cooling medium for cooling the battery cell group, and the liquid inlet pipe, the first cooling plate, the liquid outlet pipe and the second cooling plate are connected in sequence.

25. The battery module according to claim 24, characterized in that: The second cooling plate has a heat exchange panel and a flow channel panel arranged opposite to each other along the third direction, the heat exchange panel and the flow channel panel form the second cooling flow channel, the area of ​​the heat exchange panel and the bonding area of ​​the battery cell group is S1, the area of ​​the battery cell group connected to the heat exchange panel is S2, and the ratio of S1 to S2 is 0.1-1; And / or, in the third direction, the thickness of the heat exchange panel is D1, the size of the second cooling channel is H1, 0.02≤D1 / H1≤5; the thickness of the channel panel is D2, the size of the second cooling channel is H1, 0.02≤D2 / H1≤5; And / or, in the third direction, the thickness of one side of the first cooling plate connected to the bus bar is D3, the size of the second cooling channel is H2, and 0.02≤D3 / H2≤2.

26. A battery pack, characterized in that: Comprising a battery module as described in any one of claims 1-25.

27. A vehicle, characterized in that: Comprising a battery pack as claimed in claim 26.

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