A cooling plate assembly, a liquid cooling module and a battery pack

Abstract

The present invention belongs to the technical field of power batteries, and discloses a cooling plate assembly, a liquid cooling module and a battery pack, including a joint and two groups of cooling tube assemblies, the joint is provided with one or more groups of cooling channels, each group of cooling channels includes a first channel and a second channel running through a first direction, and a third channel and a fourth channel running through a second direction are provided, the first channel is connected to the third channel, and the second channel is connected to the fourth channel; two groups of cooling tube assemblies are arranged corresponding to each group of cooling channels, the two groups of cooling tube assemblies are respectively arranged on both sides of the joint along the first direction, and the two groups of cooling tube assemblies are respectively connected to the first channel and the second channel located on the same side of the joint; one of the third channel and the fourth channel is used for liquid inlet and the other is used for liquid outlet. The present invention improves the temperature uniformity performance, reduces the temperature difference between different cylindrical battery cells, improves the cooling effect, reduces the space occupied by the battery pack, improves the energy density of the battery pack, simplifies the structure, and reduces the cost.

Description

Technical Field

[0001] The present invention relates to the technical field of power batteries, and in particular to a cooling plate assembly, a liquid cooling module and a battery pack. Background Art

[0002] Currently in the power battery industry, battery packs include cylindrical cells, and most cylindrical cells are cooled by cooling tubes. However, ordinary cooling tubes have two major disadvantages: first, the battery pack has poor temperature uniformity. The cylindrical cells located at the water inlet of the cooling tube have good cooling effect, while the cylindrical cells located at the water outlet have poor cooling effect, resulting in a large temperature difference in the entire battery pack and uneven performance of different cylindrical cells; second, the assembly process of series cooling tubes is difficult, resulting in low yield; and parallel cooling tubes have low space utilization, and too many water inlet and outlet pipes result in large volume and occupy more space, resulting in low energy density of the battery pack, and in the event of a side collision, the risk of leakage is extremely high, resulting in poor grouping ability and high cost of the battery pack. Summary of the invention

[0003] The object of the present invention is to provide a cooling plate assembly, a liquid cooling module and a battery pack, which can improve the temperature uniformity of cylindrical battery cells, reduce the temperature difference between the upper and lower sides of the same cylindrical battery cell, reduce the temperature difference between cylindrical battery cells in the same row, reduce the temperature difference between cylindrical battery cells in different rows, and improve the cooling effect; reduce the space occupied by the battery pack, improve the energy density of the battery pack, simplify the structure, and reduce the cost.

[0004] To achieve this object, the present invention adopts the following technical solutions:

[0005] In a first aspect, a cooling plate assembly is provided, comprising:

[0006] A joint, wherein one or more groups of cooling channels are provided, each group of cooling channels comprises a first channel and a second channel penetrating along a first direction, and a third channel and a fourth channel penetrating along a second direction are provided, wherein the first channel is connected to the third channel, and the second channel is connected to the fourth channel;

[0007] Two groups of cooling pipe assemblies corresponding to each group of the cooling channels are respectively arranged on both sides of the joint along the first direction, and the two groups of cooling pipe assemblies are respectively connected to the first channel and the second channel located on the same side of the joint; one of the third channel and the fourth channel is used for liquid inlet and the other is used for liquid outlet.

[0008] Optionally, the third flow channel and the fourth flow channel can be used alternately for liquid inlet and liquid outlet.

[0009] Optionally, the cooling pipe assembly comprises:

[0010] a first cooling tube and a second cooling tube, wherein one end of the first cooling tube is connected to the first flow channel, and one end of the second cooling tube is connected to the second flow channel;

[0011] A liquid collecting pipe, to which the other end of the first cooling pipe and the other end of the second cooling pipe are respectively connected.

[0012] Optionally, the first flow channel and the second flow channel are arranged along a third direction of the joint.

[0013] Optionally, a plurality of pipes are respectively disposed in the first cooling pipe and the second cooling pipe.

[0014] Optionally, both the first cooling tube and the second cooling tube are serpentine tubes, and the shapes of the serpentine tubes are compatible with the cylindrical battery core.

[0015] Optionally, a heat-conducting structural layer is provided on the outer surface of the cooling tube assembly.

[0016] Optionally, two ends of the joint along the third direction are respectively provided with connecting pieces, and the two joints can be connected through the connecting pieces.

[0017] In the second aspect, a liquid cooling module is provided, comprising the above-mentioned cooling plate assembly, and a plurality of the cooling plate assemblies are provided, the plurality of the cooling plate assemblies are connected in sequence along the second direction through the joint, the third flow channels of the plurality of the cooling plate assemblies are connected to form a first cooling liquid channel, and the fourth flow channels of the plurality of the cooling plate assemblies are connected to form a second cooling liquid channel.

[0018] Optionally, the joints of the cooling plate assembly at both ends are respectively defined as a head end joint and a terminal end joint;

[0019] The third flow channel and the fourth flow channel of the head end joint, as well as the third flow channel and the fourth flow channel of the end joint, block any one of the third flow channel and any one of the fourth flow channels, and one of the other third flow channel and the fourth flow channel is used to communicate with an external liquid inlet device, and the other is used to communicate with an external liquid outlet device.

[0020] Optionally, the third flow channel and the fourth flow channel of the head end connector are both blocked, and the third flow channel and the fourth flow channel of the terminal connector are respectively connected to the outside; or

[0021] The third flow channel and the fourth flow channel of the end connector are both blocked, and the third flow channel and the fourth flow channel of the head connector are respectively connected to the outside.

[0022] Optionally, the connector is further provided with a plug, and the plug can respectively connect the third flow channels of two adjacent connectors and the fourth flow channels of two adjacent connectors.

[0023] Optionally, one end of the third flow channel and the fourth flow channel on one side of one connector are respectively fixedly connected to one end of the plug, and the other ends of the two plugs can be detachably connected to the other end of the third flow channel and the other end of the fourth flow channel of another connector.

[0024] Optionally, when a plurality of the cooling plate assemblies are arranged along a third direction, two adjacent groups of the cooling plate assemblies are sequentially connected along the third direction via the joints.

[0025] In a third aspect, a battery pack is provided, characterized in that it includes the above-mentioned liquid cooling module.

[0026] Optionally, the liquid cooling modules are provided with one or more groups. When the liquid cooling modules are provided with multiple groups, the multiple groups of the liquid cooling modules are arranged along a third direction, and two adjacent groups of the liquid cooling modules are connected via the joint.

[0027] Beneficial effects of the present invention:

[0028] The present invention provides a cooling plate assembly. During cooling, the coolant enters the joint through the third flow channel, and then the coolant enters the cooling tube assemblies on both sides through the first flow channel, and then returns to the joint through the cooling tube assembly and the second flow channel, and is discharged through the fourth flow channel. In this process, the coolant is simultaneously introduced into the cooling tube assemblies on both sides, so that the cylindrical battery cells on both sides are cooled at the same time, thereby improving the temperature uniformity of the cylindrical battery cells on both sides.

[0029] A liquid cooling module provided by the present invention reduces the temperature difference of the cylindrical battery cells in the same row and located on both sides of the joint by adopting the above-mentioned cooling plate assembly, and also reduces the temperature difference between the upper and lower sides of the cylindrical battery cells. The cooling plate assemblies are connected in parallel to reduce the temperature difference between the cylindrical battery cells in different rows, thereby improving the temperature uniformity of each cylindrical battery cell and further improving reliability. When the thermal management system starts, the coolant passes through the external liquid storage device and the third flow channel on one side of the joint of the cooling plate assembly at the end; on the one hand, a first coolant channel formed by connecting multiple joints through multiple third flow channels is a coolant inlet channel, and the coolant enters the joints of each cooling plate assembly in turn; at the same time, on the other hand, the coolant entering the joint enters the cooling pipe assemblies on both sides from the first flow channel of the joint; then enters the joint from the other end of the cooling pipe assembly and the second flow channel, and the coolant of each cooling plate assembly flows out through the fourth flow channel in turn, and the second coolant channel formed by connecting each joint through the fourth flow channel is a coolant outlet channel, and finally flows out from the fourth flow channel at the end; specifically, the fourth flow channel of the joint of the cooling plate assembly at the end is connected to an external collecting device for collecting coolant.

[0030] Through the joint connection, each cooling plate assembly is connected, and the joints at the ends are respectively connected to the external liquid outlet device and the external collection device. The first coolant channel and the second coolant channel formed by the joint connection are used to enter and exit the coolant, abandoning the traditional inlet and outlet water pipe structure, simplifying the structure, saving space, improving the volume utilization of the battery pack, reducing the difficulty of assembly, and reducing costs. The joint is set in the middle position of the liquid cooling module, so that the two sides of the battery pack do not have a long total inlet and outlet water pipe structure, reducing the risk of leakage in the pipeline when the battery pack is hit sideways.

[0031] A battery pack provided by the present invention has a better cooling effect by adopting the above-mentioned liquid cooling module, improves space utilization, can increase energy density, simplifies structure, reduces overall weight, is easy to assemble, and has the advantage of rapid mass production. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 is a schematic structural diagram of a cooling plate assembly provided by a specific embodiment of the present invention;

[0033] Figure 2 is a schematic structural diagram of a joint provided in a specific embodiment of the present invention;

[0034] Figure 3 is a cross-sectional view of a joint provided by a specific embodiment of the present invention;

[0035] Figure 4 is a schematic structural diagram of a liquid collecting pipe provided in a specific embodiment of the present invention;

[0036] Figure 5 It is a structural schematic diagram of a liquid cooling module provided by a specific embodiment of the present invention.

[0037] In the figure:

[0038] 100. Cooling plate assembly;

[0039] 1. Connector; 111. First flow channel; 112. Second flow channel; 113. Third flow channel; 114. Fourth flow channel; 12. Plug;

[0040] 2. Cooling pipe assembly; 21. First cooling pipe; 22. Second cooling pipe; 23. Liquid collecting pipe; 231. Fifth flow channel; 232. Sixth flow channel. DETAILED DESCRIPTION

[0041] In order to make the technical problems solved by the present invention, the technical solutions adopted and the technical effects achieved clearer, the technical solutions of the embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0042] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0043] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0044] This embodiment provides a cooling plate assembly, such as Figure 1-Figure 3As shown, it includes a joint 1 and a cooling pipe assembly 2. Specifically, the joint 1 is provided with one or more groups of cooling channels, each group of the cooling channels includes a first channel 111 and a second channel 112 penetrating along a first direction, and is provided with a third channel 113 and a fourth channel 114 penetrating along a second direction, the first channel 111 is connected to the third channel 113, and the second channel 112 is connected to the fourth channel 114; two groups of cooling pipe assemblies 2 are arranged corresponding to each group of the cooling channels, and the two groups of cooling pipe assemblies 2 are respectively arranged on both sides of the joint 1 along the first direction, and the two groups of cooling pipe assemblies 2 are respectively connected to the first channel 111 and the second channel 112 located on the same side of the joint 1; one of the third channel 113 and the fourth channel 114 is used for liquid inlet and the other is used for liquid outlet.

[0045] In this embodiment, Figure 1 As shown, the first direction is the x direction, the second direction is the y direction, and the third direction is the z direction. The third direction, the first direction, and the second direction are perpendicular to each other.

[0046] During cooling, the coolant enters the joint 1 through the third flow channel 113, and then enters the cooling tube assemblies 2 on both sides through the first flow channel 111, and then returns to the joint 1 through the cooling tube assembly 2 and the second flow channel 112, and is discharged through the fourth flow channel 114; in this process, the coolant is simultaneously introduced into the cooling tube assemblies 2 on both sides, so that the cylindrical battery cells on both sides are cooled at the same time, thereby improving the temperature uniformity of the cylindrical battery cells on both sides.

[0047] Furthermore, the third flow channel 113 and the fourth flow channel 114 can be used alternately for liquid inlet and liquid outlet, so that the two ends of the cooling tube assembly 2 alternately carry out liquid inlet and liquid outlet, and the coolant can circulate alternately in two directions, thereby improving the temperature uniformity of the upper and lower sides of the cylindrical battery cell. Specifically, the situation where the fourth flow channel 114 is used for liquid inlet and the third flow channel 113 is used for liquid outlet can refer to the situation where the third flow channel 113 is used for liquid inlet and the fourth flow channel 114 is used for liquid outlet, and no further details are given. Specifically, the third flow channel 113 can be used for liquid inlet and the fourth flow channel 114 can be used for liquid outlet. After half an hour, the third flow channel 113 is used for liquid outlet and the fourth flow channel 114 is used for liquid inlet; specifically, the interval time of alternating liquid inlet and outlet can be set according to the specific working conditions and is not limited. Throughout the entire thermal management process, the heat exchanged by each cylindrical battery cell is basically the same, and the heat exchanged by the upper and lower sides of the cylindrical battery cell is basically the same, which reduces the temperature difference and improves reliability.

[0048] In this embodiment, Figure 1-Figure 3As shown, a group of cooling channels is provided on the joint 1, and the cooling plate assembly includes two groups of cooling tube assemblies 2. In other embodiments, multiple groups of cooling channels may be provided on the joint 1. Taking two groups of cooling channels as an example, two groups of cooling channels are provided on the joint 1, and four groups of cooling tube assemblies 2 are provided accordingly; specifically, when two groups of cooling channels are provided along the third direction, two groups of cooling tube assemblies 2 are provided on each side along the third direction, which can further improve the temperature uniformity of the cylindrical battery cell.

[0049] Alternatively, if Figure 1 As shown, the cooling tube assembly 2 includes a manifold 23, a first cooling tube 21, and a second cooling tube 22, wherein one end of the first cooling tube 21 is connected to the first flow channel 111, and one end of the second cooling tube 22 is connected to the second flow channel 112; the other end of the first cooling tube 21 and the other end of the second cooling tube 22 are respectively connected to the manifold 23. The coolant flows through the first flow channel 111, the first cooling tube 21, the manifold 23, the second cooling tube 22, and the second flow channel 112 in sequence, or circulates in reverse, and the first cooling tube 21 and the second cooling tube 22 are connected through the manifold 23, so that the upper and lower sides of the cylindrical battery cell are cooled simultaneously. The cooling tube assembly 2 is set in a split manner to facilitate processing and assembly and reduce costs.

[0050] The cooling plate assembly 100 is divided into two parts, an upper part and an lower part, along a third direction, and can cool the upper and lower sides of the cylindrical battery cell. When the coolant flows along the cooling plate assembly 100, the temperature gradually increases due to the absorption of heat, so that the coolant temperature of the liquid inlet part (the upper / lower side of the third direction) of the cooling plate assembly 100 gradually increases from the end close to the joint 1 to the end away from the joint 1, and the coolant temperature of the liquid outlet part (the lower / upper side of the third direction) gradually increases from the end away from the joint 1 to the end close to the joint 1, which can ensure the temperature uniformity of each cylindrical battery cell, and is particularly suitable for the case where the height of the cylindrical battery cell is relatively high.

[0051] Specifically, Figure 4 As shown, the manifold 23 includes a fifth flow channel 231 and a sixth flow channel 232 that are interconnected, the first cooling tube 21 is connected to the fifth flow channel 231, and the second cooling tube 22 is connected to the sixth flow channel 232. The coolant flows sequentially through the third flow channel 113, the first flow channel 111, the first cooling tube 21, the fifth flow channel 231, the manifold 23, the sixth flow channel 232, the second cooling tube 22, the second flow channel 112, and the fourth flow channel 114, or circulates in the opposite direction.

[0052] Specifically, the collecting pipe 23 is a cavity structure, and the fifth flow channel 231 and the sixth flow channel 232 are connected through the cavity structure. The material is not limited, and it can be connected to the first cooling tube 21 and the second cooling tube 22 respectively. Specifically, the collecting pipe 23 can be connected to the first cooling tube 21 and the second cooling tube 22 by welding, bonding or other connection processes. Specifically, the collecting pipe 23 can connect the first cooling tube 21 and the second cooling tube 22, and the volume should be minimized to save space. It can be designed according to the internal space of the battery pack without limitation.

[0053] Specifically, refer to Figure 1 and Figure 2 , the first flow channel 111 and the second flow channel 112 are arranged along the third direction of the joint 1 .

[0054] Specifically, the first cooling tube 21 and the second cooling tube 22 cool the cylindrical battery cell, and can be made of metal materials such as aluminum alloy, steel, copper alloy, or materials with good thermal conductivity, without limitation. Optionally, a plurality of pipes are respectively provided in the first cooling tube 21 and the second cooling tube 22 to improve the uniformity of the coolant passing into the first cooling tube 21 and the second cooling tube 22, thereby improving the cooling effect along the third direction of the cylindrical battery cell.

[0055] In this embodiment, the cooling tube assembly 2 and the joint 1 can be welded. In other embodiments, the cooling tube assembly 2 and the joint 1 can be detachably connected to facilitate assembly; further, the cooling tube assembly 2 can also be located only on one side of the joint 1, blocking the first flow channel 111 and the second flow channel 112 on the other side, so that the joint 1 is located at one end, which can be specifically set according to actual conditions.

[0056] Optionally, both the first cooling tube and the second cooling tube are serpentine tubes, the shape of the serpentine tubes is adapted to the cylindrical battery cell, the contact area between the cooling tube assembly 2 and the cylindrical battery cell is increased, and the cooling effect is improved; specifically, the first cooling tube 21 and the second cooling tube 22 respectively have multiple arc surfaces, and the curvature of the arc surfaces is adapted to the cylindrical battery cell.

[0057] Optionally, a heat-conducting structural layer is provided on the outer surface of the cooling tube assembly 2, and the heat-conducting structural layer can further increase the tightness of the fit between the cooling tube assembly 2 and the cylindrical battery cell, so that the heat generated by the cylindrical battery cell is conducted to the cooling tube assembly 2 through the heat-conducting structural layer, and the heat on the cooling tube assembly 2 is then taken away by the coolant in its own pipe, thereby improving the cooling effect. Specifically, the heat-conducting structural layer is made of a heat-conducting structural adhesive, has a good heat-conducting effect, and improves the reliability of the structural installation, playing a dual role of heat conduction and structural fixation.

[0058] Optionally, the connector 1 is provided with connecting parts at both ends along the third direction, and the two connectors 1 can be connected through the connecting parts. When a plurality of cooling plate assemblies are arranged along the third direction, two adjacent connectors 1 along the third direction are connected through the connecting parts. Specifically, the connecting part can be a plug 12 and a socket. A plug 12 is provided at one end of the connector 1, and a socket is provided at the other end. The two connectors 1 are plug-connected by plugging the plug 12 and the socket. In other embodiments, the connecting part can be deformed accordingly according to the prior art so as to enable the two connectors 1 to be connected, without limitation.

[0059] Specifically, when the height of the cylindrical battery cell is relatively large, a plurality of groups of cooling plate assemblies may be arranged along the third direction to cool the cylindrical battery cell.

[0060] Specifically, Figure 5 As shown, multiple cooling plate assemblies are arranged along the second direction to form a layer. When the cylindrical battery cells are arranged in one layer, one layer of cooling plate assemblies is used to cool one layer of cylindrical battery cells; when multiple layers of cylindrical battery cells are provided, each layer of cylindrical battery cells is cooled by a layer of cooling plate assemblies, and the multiple layers of cylindrical battery cells are cooled by multiple layers of cooling plate assemblies. In the multiple layers of cooling plate assemblies, the joints 1 of each layer are connected to the joints 1 of another layer by a connector, which ensures the stability of the mechanical structure connection and improves the connection reliability.

[0061] This embodiment also provides a liquid cooling module, such as Figure 5 As shown, it includes a plurality of cooling plate assemblies 100; specifically, a plurality of cooling plate assemblies are connected in sequence along the second direction through a joint 1, a third flow channel 113 of a plurality of cooling plate assemblies are connected to form a first coolant channel, and a fourth flow channel 114 of a plurality of cooling plate assemblies are connected to form a second coolant channel.

[0062] Specifically, the cooling plate assembly 100 is disposed close to the cylindrical battery cells, and can be disposed between two adjacent rows of cylindrical battery cells. Multiple groups of cooling plate assemblies 100 are connected in parallel via the connector 1 to cool multiple rows of cylindrical battery cells. When the thermal management system starts, the coolant enters the joint 1 of the cooling plate assembly 100 located at the end through the external liquid storage device through the third flow channel 113 on one side of the joint 1 of the cooling plate assembly 100 located at the end; on the one hand, the first coolant channel formed by connecting multiple joints 1 through multiple third flow channels 113 is the coolant inlet channel, and the coolant enters the joints 1 of each cooling plate assembly 100 in turn; at the same time, on the other hand, the coolant entering the joint 1 enters the cooling pipe assemblies 2 on both sides from the first flow channel 111 of the joint 1; then enters the joint 1 from the other end of the cooling pipe assembly 2 and the second flow channel 112, and the coolant of each cooling plate assembly 100 flows out through the fourth flow channel 114 in turn, and the second coolant channel formed by connecting each joint 1 through the fourth flow channel 114 is the coolant outlet channel, and finally flows out from the fourth flow channel 114 located at the end; specifically, the fourth flow channel 114 of the joint 1 of the cooling plate assembly 100 located at the end is connected to an external collecting device for collecting coolant.

[0063] Through the connection of the joint 1, each cooling plate assembly 100 is connected, and the joint 1 at the end is respectively connected to the external liquid outlet device and the external collection device. The first coolant channel and the second coolant channel formed by the connection of the joint 1 are used to enter and exit the coolant, abandoning the traditional inlet and outlet water pipe structure, simplifying the structure, saving space, improving the volume utilization of the battery pack, reducing the difficulty of assembly, and reducing costs. The joint 1 is set in the middle position of the liquid cooling module, so that the two sides of the battery pack do not have a long total inlet and outlet water pipe structure, reducing the risk of coolant leakage when the battery pack is hit sideways.

[0064] The cooling plate assemblies 100 are connected in parallel to reduce the temperature difference between cylindrical battery cells in different rows. By adopting the above-mentioned cooling plate assembly 100, the temperature difference of the cylindrical battery cells in the same row and located on both sides of the joint 1 is reduced, and the temperature difference between the upper and lower sides of the cylindrical battery cells is also reduced, thereby improving the temperature uniformity of each cylindrical battery cell and further improving reliability.

[0065] During this process, the coolant flow rate can be increased, the time difference between different cooling plate assemblies 100 entering the coolant can be reduced, and the temperature difference between different cooling plate assemblies 100 can be further reduced, thereby meeting the temperature reduction cooling requirements of the cylindrical battery cells under high-rate discharge conditions.

[0066] For the convenience of description, the joints 1 of the cooling plate assembly 100 at both ends are respectively defined as a head end joint and a terminal end joint.

[0067] Optionally, the third flow channel 113 of the head end joint and the end joint is used for liquid inlet at the same time, and the fourth flow channel 114 of the head end joint and the end joint is used for liquid outlet at the same time; or, the fourth flow channel 114 of the head end joint and the end joint is used for liquid inlet at the same time, and the third flow channel 113 of the head end joint and the end joint is used for liquid outlet at the same time, and liquid inlet and liquid outlet are increased from both ends, thereby increasing the liquid inlet and liquid outlet amounts, improving the circulation speed of the coolant, and improving the cooling effect. Of course, liquid inlet and liquid outlet can also be performed alternately, that is, the fourth flow channel 114 of the head end joint and the end joint is used for liquid inlet at the same time, and the third flow channel 113 of the head end joint and the end joint is used for liquid outlet at the same time, and after a preset time interval, such as half an hour, the third flow channel 113 of the head end joint and the end joint is used for liquid inlet at the same time, and the fourth flow channel 114 of the head end joint and the end joint is used for liquid outlet at the same time.

[0068] Optionally, the third flow channel 113 and the fourth flow channel 114 of the head end joint, and the third flow channel 113 and the fourth flow channel 114 of the end joint, block any one of the third flow channel 113 and any one of the fourth flow channels, and one of the other third flow channel 113 and the fourth flow channel 114 is used to connect with an external liquid inlet device, and the other is used to connect with an external liquid outlet device; the number of connections with the external liquid storage device and the external collection device is reduced, and the structure is simplified.

[0069] In this embodiment, the third flow channel 113 and the fourth flow channel 114 of the head end joint are blocked, and the third flow channel 113 and the fourth flow channel 114 of the end joint are respectively connected to the outside, and the external liquid storage device and the external collection device can be both located on the side of the liquid cooling module close to the end joint, which is convenient for structural layout. Specifically, a solenoid valve can be provided to control the third flow channel 113 to be connected to one of the external liquid storage device and the external collection device, and to control the fourth flow channel 114 to be connected to the other of the external liquid storage device and the external collection device. Specifically, the first water pipe and the second water pipe can be connected to the third flow channel 113 at the same time, and the third water pipe and the fourth water pipe can be connected to the fourth flow channel 114 at the same time. The first water pipe and the third water pipe are simultaneously connected to the external liquid storage device, and the second water pipe and the fourth water pipe are simultaneously connected to the external collection device. The first water pipe, the second water pipe, the third water pipe and the fourth water pipe are respectively provided with solenoid valves for opening and closing. When the electromagnetic valves on the first water pipe and the fourth water pipe are connected at the same time, and the electromagnetic valves on the second water pipe and the third water pipe are disconnected at the same time, the third flow channel 113 is used for liquid inlet and the fourth flow channel 114 is used for liquid outlet; when the electromagnetic valves on the first water pipe and the fourth water pipe are disconnected at the same time, the electromagnetic valves on the second water pipe and the third water pipe are connected at the same time, the third flow channel 113 is used for liquid outlet and the fourth flow channel 114 is used for liquid inlet. In other embodiments, other electromagnetic valves can also be used for connection, which is not limited.

[0070] In other embodiments, the external liquid storage device and the external collection device may be disposed on both sides of the liquid cooling module to respectively block the third flow channel 113 of the head end connector and the fourth flow channel 114 of the end connector, so that the fourth flow channel 114 of the head end connector and the third flow channel 113 of the end connector are respectively connected to the outside; or the third flow channel 113 of the end connector and the fourth flow channel 114 of the head end connector are respectively blocked to make the fourth flow channel 114 of the end connector and the third flow channel 113 of the head end connector be respectively connected to the outside. Blocking can prevent leakage of the coolant.

[0071] As an optional embodiment, the liquid cooling module also includes a liquid inlet control valve assembly and a liquid outlet control valve assembly. The third flow channel 113 and the fourth flow channel 114 of the connector 1 of the cooling plate assembly 100 at one end are connected to the external liquid storage device through the liquid inlet control valve assembly. The liquid inlet control valve assembly can connect one of the third flow channel 113 and the fourth flow channel 114 to the external liquid storage device and block the other. The liquid cooling module also includes a liquid outlet control valve assembly. The third flow channel 113 and the fourth flow channel 114 of the connector 1 of the cooling plate assembly 100 at the other end are connected to the external liquid storage device through the liquid inlet control valve assembly. The flow channel 114 is connected to the external collection device through the liquid outlet control valve assembly. The liquid outlet control valve assembly can connect one of the third flow channel 113 and the fourth flow channel 114 to the external collection device and block the other one. When the liquid inlet control valve assembly connects the third flow channel 113 to the external liquid storage device, the liquid outlet control valve assembly connects the fourth flow channel 114 to the external collection device. Or when the liquid inlet control valve assembly connects the fourth flow channel 114 to the external liquid storage device, the liquid outlet control valve assembly connects the third flow channel 113 to the external collection device. By controlling the liquid inlet control valve assembly and the liquid outlet control valve assembly, the flow direction of the coolant in the cooling tube assembly 2 can be controlled, so that the cooling of the cylindrical battery cell is more uniform and the control is more convenient. In other embodiments, blocking can also be used without limitation.

[0072] Further, in this embodiment, the liquid inlet control valve assembly is a two-position three-way solenoid valve (not shown in the figure), whose two outlets are respectively connected to the third flow channel 113 and the fourth flow channel 114, and whose inlet is connected to the external liquid storage device; specifically, the two-position three-way solenoid valve is a one-inlet and two-outlet valve. Similarly, in this embodiment, the liquid outlet control valve assembly is a two-position three-way solenoid valve (not shown in the figure), whose two inlets are respectively connected to the third flow channel 113 and the fourth flow channel 114, and whose outlet is connected to the external collection device. Specifically, the two-position three-way solenoid valve is a two-inlet and one-outlet valve.

[0073] In other embodiments, the liquid inlet control valve assembly includes two direct-acting solenoid valves (not shown in the figure), the outlets of the two direct-acting solenoid valves are respectively connected to the third flow channel 113 and the fourth flow channel 114, and the inlets of the two direct-acting solenoid valves are connected to the external liquid storage device; similarly, in other embodiments, the liquid outlet control valve assembly includes two direct-acting solenoid valves (not shown in the figure), the inlets of the two direct-acting solenoid valves are respectively connected to the third flow channel 113 and the fourth flow channel 114, and the outlets of the two direct-acting solenoid valves are connected to the external collection device.

[0074] Alternatively, if Figure 2 As shown, the joint 1 is in a hexahedral shape, and is provided with a first flow channel 111 and a second flow channel 112 extending along a first direction, and is provided with a third flow channel 113 and a fourth flow channel 114 extending along a second direction. The joint 1 has a regular structure, is easy to process and assemble, reduces production costs, and occupies little space.

[0075] Optionally, the connector 1 is further provided with a plug 12, which can respectively connect the third flow channel 113 of two adjacent connectors 1 and the fourth flow channel 114 of two adjacent connectors 1. The plug 12 is arranged between two adjacent cooling plate assemblies 100, and together with the connector 1 respectively forms a first coolant flow channel and a second coolant channel. Each connector 1 is connected to another connector 1 through its own plug 12, and the connection between different connectors 1 is facilitated by the plug 12, thereby improving the assembly efficiency of adjacent cooling plate assemblies 100.

[0076] In this embodiment, Figure 2 As shown, two plugs 12 are arranged between adjacent joints 1, which are respectively connected to the third flow channel on the opposite sides of the two joints and the fourth flow channel on the opposite sides of the two joints.

[0077] Specifically, when the height of the cylindrical battery cell is relatively large, multiple groups of cooling plate assemblies may be arranged along the third direction for cooling the cylindrical battery cell. Optionally, when a plurality of the cooling plate assemblies are arranged along the third direction, two adjacent groups of the cooling plate assemblies are sequentially connected along the third direction through the joint 1, thereby improving the reliability of the structural connection.

[0078] The present embodiment provides a battery pack, which includes a liquid cooling module for cooling cylindrical cells. By adopting the above-mentioned liquid cooling module, the battery pack has a better cooling effect, improves space utilization, can improve energy density, simplify the structure, reduce overall weight, and is easy to assemble, and has the advantage of rapid mass production. Specifically, the cylindrical cells are arranged according to the maximum space utilization, and the size, angle and shape of the liquid cooling module are arranged according to the cylindrical cell arrangement. It can be adjusted according to the changes in the diameter and height of the cylindrical cells, and has high adaptability.

[0079] Furthermore, the liquid cooling module is provided with one or more groups. When the liquid cooling module is provided with multiple groups, the multiple groups of liquid cooling modules are arranged along the third direction, and two adjacent groups of liquid cooling modules are connected by the joint 1. Specifically, Figure 5 As shown, multiple cooling plate assemblies are arranged along the second direction to form a layer. When the cylindrical battery cell is arranged in one layer, one cooling plate assembly is used to cool the cylindrical battery cell; when multiple layers of cylindrical battery cells are provided, each layer of cylindrical battery cell is cooled by a cooling plate assembly, and the multiple layers of cylindrical battery cells are cooled by multiple cooling plate assemblies. In the multiple cooling plate assemblies, the joint 1 of each layer is connected to the joint 1 of another layer by a connector, which ensures the stability of the mechanical structure connection and improves the connection reliability. The specific number of liquid cooling modules can be set according to the space size and is not limited.

[0080] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A cooling plate assembly, characterized in that: include: A joint (1) is provided with one or more groups of cooling channels, each group of cooling channels comprising a first channel (111) and a second channel (112) penetrating along a first direction, a third channel (113) and a fourth channel (114) penetrating along a second direction, the first channel (111) being in communication with the third channel (113), and the second channel (112) being in communication with the fourth channel (114); Two groups of cooling pipe assemblies (2) are arranged corresponding to each group of the cooling flow channels, the two groups of cooling pipe assemblies (2) are respectively arranged on both sides of the joint (1) along the first direction, and the two groups of cooling pipe assemblies (2) are respectively connected to the first flow channel (111) and the second flow channel (112) located on the same side of the joint (1); one of the third flow channel (113) and the fourth flow channel (114) is used for liquid inlet and the other is used for liquid outlet; The third flow channel (113) and the fourth flow channel (114) can be used alternately for liquid inlet and liquid outlet; The cooling pipe assembly (2) comprises: A first cooling tube (21) and a second cooling tube (22), wherein one end of the first cooling tube (21) is connected to the first flow channel (111), and one end of the second cooling tube (22) is connected to the second flow channel (112); a liquid collecting pipe (23), to which the other end of the first cooling pipe (21) and the other end of the second cooling pipe (22) are respectively connected; The connector (1) is provided with connecting pieces at both ends along the third direction, and the two connectors (1) can be connected via the connecting pieces; The third direction, the first direction and the second direction are perpendicular to each other.

2. The cooling plate assembly according to claim 1, characterized in that The first flow channel (111) and the second flow channel (112) are arranged along a third direction of the joint (1).

3. The cooling plate assembly according to claim 1, characterized in that A plurality of pipes are respectively arranged in the first cooling pipe (21) and the second cooling pipe (22).

4. The cooling plate assembly according to claim 1, characterized in that The first cooling tube and the second cooling tube are both serpentine tubes, and the shape of the serpentine tubes is compatible with the cylindrical battery core.

5. The cooling plate assembly according to any one of claims 1 to 4, characterized in that: The outer surface of the cooling tube assembly (2) is provided with a heat-conducting structural layer.

6. A liquid cooling module, characterized in that: It comprises a cooling plate assembly as described in any one of claims 1 to 5, and a plurality of the cooling plate assemblies are provided, the plurality of the cooling plate assemblies are connected in sequence along the second direction through the joint (1), the third flow channels (113) of the plurality of the cooling plate assemblies are connected to form a first coolant channel, and the fourth flow channels (114) of the plurality of the cooling plate assemblies are connected to form a second coolant channel.

7. The liquid cooling module according to claim 6, characterized in that: The joints (1) of the cooling plate assembly at both ends are respectively defined as a head end joint and a terminal end joint; The third flow channel (113) and the fourth flow channel (114) of the head end joint, as well as the third flow channel (113) and the fourth flow channel (114) of the end joint, block any one of the third flow channel (113) and any one of the fourth flow channels, and of the other third flow channel (113) and the fourth flow channel (114), one is used to communicate with an external liquid inlet device, and the other is used to communicate with an external liquid outlet device.

8. The liquid cooling module according to claim 7, characterized in that: The third flow channel (113) and the fourth flow channel (114) of the head end connector are both blocked, and the third flow channel (113) and the fourth flow channel (114) of the end connector are respectively connected to the outside; or The third flow channel (113) and the fourth flow channel (114) of the end connector are both blocked, and the third flow channel (113) and the fourth flow channel (114) of the head connector are respectively connected to the outside.

9. The liquid cooling module according to any one of claims 6 to 8, characterized in that: The connector (1) is further provided with a plug (12), and the plug (12) is capable of respectively connecting the third flow channels (113) of two adjacent connectors (1) and the fourth flow channels (114) of two adjacent connectors (1).

10. The liquid cooling module according to claim 9, characterized in that: One end of the third flow channel (113) and the fourth flow channel (114) on one side of one connector (1) are respectively fixedly connected to one end of the plug (12), and the other ends of the two plugs (12) can be detachably connected to the other end of the third flow channel (113) and the other end of the fourth flow channel (114) of another connector (1).

11. The liquid cooling module according to any one of claims 6 to 8, characterized in that: When a plurality of the cooling plate assemblies are arranged along a third direction, two adjacent groups of the cooling plate assemblies are connected in sequence along the third direction via the joint (1).

12. A battery pack, characterized in that: Comprising the liquid cooling module as described in any one of claims 6-11.

13. The battery pack according to claim 12, characterized in that: The liquid cooling modules are provided with one or more groups. When the liquid cooling modules are provided with multiple groups, the multiple groups of liquid cooling modules are arranged along a third direction, and two adjacent groups of liquid cooling modules are connected via the joint (1).

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