Battery module and cell liquid cooling method

Abstract

The application discloses a battery module and a cell liquid cooling method, and belongs to the technical field of batteries. The battery module comprises a cell and a box body. A cavity body is formed in the box body, a plurality of cells arranged in parallel are placed in the cavity body, cooling liquid is filled into the cavity body, and the bottom surface and the top surface of the box body are respectively provided with a first flow channel and a second flow channel, which are communicated with the cavity body to fill the cooling liquid into the cavity body. The battery module of the application can completely immerse the cell in the circulating cooling liquid for heat dissipation, can ensure uniform heat dissipation of each part of the cell, has a good liquid cooling effect, and has a low cost.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery, in particular to a battery module and a liquid cooling method of battery cell. BACKGROUND

[0002] In the battery module, the liquid cooling method of the battery cell is mostly to cool the battery cell by directly contacting the battery cell with the liquid cooling pipe or the liquid cooling plate. The liquid cooling method needs to set the liquid cooling pipe or the liquid cooling plate, so that the cost of the battery module is high, and because the contact area between the liquid cooling pipe or the liquid cooling plate and the battery cell is limited, the liquid cooling effect on the battery cell is poor.

[0003] In order to solve the above problems, by directly immersing part of the structure of the battery cell in the cooling liquid, the liquid cooling pipe or the liquid cooling plate is not needed, and the cost is saved. However, because only part of the structure of the battery cell is immersed in the cooling liquid, the liquid cooling effect on the battery cell cannot be guaranteed. SUMMARY

[0004] The purpose of the present application is to provide a battery module and a liquid cooling method of battery cell, which can immerse the battery cell in the circulating cooling liquid for heat dissipation, can guarantee uniform heat dissipation of each part of the battery cell, has good liquid cooling effect, and has low cost.

[0005] To achieve this purpose, the present application adopts the following technical solutions:

[0006] A battery module comprises:

[0007] a battery cell;

[0008] a box body, which forms a cavity body inside, and a plurality of battery cells are arranged side by side in the cavity body, and the cavity body is filled with cooling liquid, and the bottom surface and the top surface of the box body are respectively provided with a first flow channel and a second flow channel, and the first flow channel and the second flow channel are respectively communicated with the cavity body to fill the cooling liquid into the cavity body.

[0009] As an optional solution, the side surface of the box body is provided with a third flow channel, and the third flow channel is respectively communicated with the second flow channel and the first flow channel, so that the cooling liquid in the third flow channel flows to the second flow channel and the first flow channel respectively.

[0010] As an optional solution, the box body comprises:

[0011] a box body, which comprises a first side plate located on the side surface of the box body, and the first side plate is provided with the third flow channel, the third flow channel penetrates through the first side plate along the Z axis, and one side surface of the first side plate is provided with a liquid inlet communicated with the third flow channel.

[0012] As an option, the box body further comprises a second side plate located at the side of the box body, the second side plate is arranged opposite to the first side plate, a fourth flow channel is arranged in the second side plate and communicates with the cavity, and one side of the second side plate is provided with a liquid outlet communicating with the fourth flow channel, the fourth flow channel is used for flowing the cooling liquid in the cavity to the liquid outlet.

[0013] As an option, the box further comprises:

[0014] A top cover assembly is located at the top surface of the box and is sealingly connected to the top end opening of the box body, the top cover assembly comprises an upper flow channel plate, the top end surface of the upper flow channel plate is provided with the second flow channel, and a first through hole communicating with the cavity is arranged in the second flow channel.

[0015] As an option, the second flow channel comprises:

[0016] An upper main flow channel extends along the Y axis, one end of the upper main flow channel communicates with the third flow channel;

[0017] A plurality of upper branch flow channels extend along the X axis, the plurality of upper branch flow channels respectively communicate with the other end of the upper main flow channel, the plurality of upper branch flow channels are arranged in parallel along the Y axis, and a plurality of first through holes are respectively arranged in each upper branch flow channel.

[0018] As an option, the top cover assembly further comprises:

[0019] An upper cover plate is sealingly arranged on one side of the upper flow channel plate provided with the second flow channel, and a window for injecting cooling liquid into the cavity is arranged on the upper cover plate.

[0020] As an option, the box further comprises:

[0021] A bottom plate assembly is located at the bottom surface of the box and is sealingly connected to the bottom end opening of the box body, the bottom plate assembly comprises a lower flow channel plate, the bottom end surface of the lower flow channel plate is provided with the first flow channel, and a second through hole communicating with the cavity is arranged in the first flow channel.

[0022] As an option, the first flow channel comprises:

[0023] A lower main flow channel extends along the Y axis, one end of the lower main flow channel communicates with the third flow channel;

[0024] A plurality of lower branch flow channels extend along the X axis, the plurality of lower branch flow channels respectively communicate with the other end of the lower main flow channel, the plurality of lower branch flow channels are arranged in parallel along the Y axis, and a plurality of second through holes are respectively arranged in each lower branch flow channel.

[0025] As an option, a plurality of pressure relief holes are arranged on the lower channel plate, one of the battery cells is arranged corresponding to one of the pressure relief holes, and an insulating sealing element is connected between the battery cell and the pressure relief hole.

[0026] As an option, the battery cell is a cylindrical battery cell, and the two ends of the battery cell along the axial direction are respectively directed to the top surface of the box body and the bottom surface of the box body, and the side walls of the adjacent battery cells along the radial direction abut each other.

[0027] A battery cell liquid cooling method is used for liquid cooling of the battery cell in the battery module as described above, and comprises the following steps:

[0028] S1: filling the cavity body with cooling liquid so that the battery cell is immersed in the cooling liquid;

[0029] S2: filling the second flow channel on the top surface and the first flow channel on the bottom surface with cooling liquid respectively, so that the cooling liquid flows at the top end and the bottom end of the battery cell respectively, and the cooling liquid in the second flow channel and the first flow channel flows back to the cavity body.

[0030] The battery module provided by the application has the following beneficial effects:

[0031] The cavity body of the box body is filled with cooling liquid so that the battery cell is immersed in the cooling liquid, and the second flow channel on the top surface and the first flow channel on the bottom surface are filled with cooling liquid, so that the cooling liquid flows at the top end and the bottom end of the battery cell, and the cooling liquid in the second flow channel and the first flow channel flows back to the cavity body. That is, the cooling liquid in the cavity body, the cooling liquid in the second flow channel, and the cooling liquid in the first flow channel can completely immerse the battery cell in the cooling liquid, so that the battery cell can be completely immersed in the circulating cooling liquid for cooling, ensuring uniform heat dissipation of each part of the battery cell, and the liquid cooling effect is good, thereby improving the heat dissipation efficiency of the battery cell. Liquid cooling pipes or liquid cooling plates are not needed, saving costs. The second flow channel and the first flow channel are integrated on the box body, and no other structure for arranging the flow channel is needed, so that the cost of the entire battery module is lower. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 is a disassembled structural schematic view of the battery module provided by the application;

[0033] Figure 2 is a structural schematic view of the battery module (excluding the battery cell, the insulating support, the integrated copper bar, and one third side plate) provided by the application;

[0034] Figure 3 is a structural schematic view of the assembly structure between the first side plate, the second side plate, and the lower channel plate.

[0035] Figure 4 is a structural schematic diagram of the second side plate provided by the present application;

[0036] Figure 5 is an exploded structural schematic diagram of the top cover assembly provided by the present application;

[0037] Figure 6 is an exploded structural schematic diagram of the bottom surface of the bottom plate assembly (with the lower cover plate on top) provided by the present application;

[0038] Figure 7 is a structural schematic diagram of the bottom surface of the box body (with the lower cover plate removed) provided by the present application;

[0039] Figure 8 is a structural schematic diagram of the lower flow channel plate provided by the present application;

[0040] Figure 9 is a flow schematic diagram of the cell liquid cooling method provided by the present application.

[0041] Explanation of reference signs:

[0042] 1 - cell;

[0043] 2 - box body; 21 - cavity body; 22 - box body main body; 221 - first side plate; 222 - second side plate; 223 - third side plate; 224 - glue groove; 23 - top cover assembly; 231 - upper flow channel plate; 2311 - liquid injection hole; 232 - upper cover plate; 2321 - window; 2322 - shielding plate; 24 - bottom plate assembly; 241 - lower flow channel plate; 2411 - pressure relief through hole; 2412 - insulating sealing element; 242 - lower cover plate; 2421 - third through hole;

[0044] 3 - third flow channel; 32 - liquid inlet nozzle;

[0045] 4 - second flow channel; 41 - upper main flow channel; 42 - upper branch flow channel; 43 - first through hole;

[0046] 5 - first flow channel; 51 - lower main flow channel; 52 - lower branch flow channel; 53 - second through hole;

[0047] 61 - liquid outlet; 62 - liquid outlet nozzle; 64 - outlet hole;

[0048] 7 - integrated copper bar; 8 - insulating support; 81 - mounting hole; 9 - output pole. DETAILED DESCRIPTION

[0049] All features disclosed in this specification, and / or all steps of any methods or processes disclosed in this specification, can be combined in any combination, except combinations where at least some of the features and / or steps are mutually exclusive.

[0050] Any feature in the description that can be expressed as a combination of two or more elements can be implemented with a "system" containing those elements unless expressly described otherwise. For example, the features of the described embodiments can be combined with each other or other features and can be implemented both on a "system" and medium "computer program product" levels as set forth herein.

[0051] In order to make the technical problems solved by the present application, the technical solutions adopted and the technical effects achieved more clear, the technical solutions of the present application will be further described below in combination with the drawings and through specific embodiments.

[0052] Embodiment one

[0053] The battery module in the embodiment has high heat dissipation efficiency, simple structure and low cost. The battery module in the embodiment can be a lithium battery module, and the specific type of the battery module is not limited herein.

[0054] Specifically, as shown in Figures 1 to 8 the battery module includes a box body 2 and a plurality of battery cells 1. A cavity 21 is formed in the box body 2, and the plurality of battery cells 1 are arranged side by side in the cavity 21. The cavity 21 is filled with cooling liquid. A first flow channel 5 and a second flow channel 4 are respectively arranged on the bottom surface and the top surface of the box body 2, and the second flow channel 4 and the first flow channel 5 are respectively communicated with the cavity 21 to fill the cooling liquid into the cavity 21. The cavity 21 is filled with the cooling liquid.

[0055] The battery module in the embodiment changes the liquid cooling mode of the battery cells 1 compared with the prior art. The cooling liquid is filled into the cavity 21 of the box body 2 to immerse the battery cells 1 in the cooling liquid. The cooling liquid is filled into the second flow channel 4 on the top surface and the first flow channel 5 on the bottom surface to flow the cooling liquid at the top end and the bottom end of the battery cells 1, and the cooling liquid in the second flow channel 4 and the first flow channel 5 flows back into the cavity 21. That is, the cooling liquid in the cavity 21, the cooling liquid in the second flow channel 4 and the cooling liquid in the first flow channel 5 can completely immerse the battery cells 1 in the cooling liquid, so that the battery cells 1 can be cooled in the circulating cooling liquid to uniformly cool each part of the battery cells 1, and the liquid cooling effect is good, thereby improving the heat dissipation efficiency of the battery cells 1. The liquid cooling pipe or the liquid cooling flat plate is not needed, the structure is simple, and the cost is saved. The second flow channel 4 and the first flow channel 5 are integrated on the box body 2, and no other structure for arranging the flow channel is needed, so that the structure of the entire battery module is simpler, and the cost is lower.

[0056] It is worth mentioning that the battery cell 1 in the embodiment is a cylindrical battery cell, and the two ends of the battery cell 1 along the axial direction are respectively directed to the top surface of the box body 2 and the bottom surface of the box body 2, and the side walls of the adjacent battery cells 1 along the radial direction abut each other, so as to be able to improve the energy density of the battery module while ensuring heat dissipation.

[0057] Specifically, as shown in Figures 1 to 3 , a third flow channel 3 is arranged on the side surface of the box body 2, and the third flow channel 3 is in communication with the second flow channel 4 and the first flow channel 5 respectively, so that the cooling liquid in the third flow channel 3 flows into the second flow channel 4 and the first flow channel 5 respectively.

[0058] Further, as shown in Figures 1 to 3 , the box body 2 includes a box body main body 22, the box body main body 22 includes a first side plate 221 located on the side surface of the box body 2, and the third flow channel 3 is arranged in the first side plate 221, the third flow channel 3 penetrates the first side plate 221 along the Z-axis, and a liquid inlet is arranged on one side surface of the first side plate 221 and in communication with the third flow channel 3.

[0059] Specifically, as shown in Figure 1 and Figure 2 , the box body main body 22 further includes a second side plate 222 and two third side plates 223 located on the side surface of the box body 2 respectively, the second side plate 222 is arranged opposite to the first side plate 221, and the two third side plates 223 are arranged opposite to each other, the first side plate 221, the second side plate 222 and the two third side plates 223 are connected to form a square structure, that is, the box body main body 22 is a square structure with an opening, and the box body main body 22 specifically has a top opening and a bottom opening in communication.

[0060] Specifically, as shown in Figure 1 and Figure 3 , a liquid inlet nozzle 32 is connected to the liquid inlet, that is, the liquid inlet nozzle 32 is connected to the liquid inlet after penetrating through one of the third side plates 223, so as to be able to deliver the cooling liquid to the liquid inlet and the third flow channel 3 through the liquid inlet nozzle 32. The cooling liquid in the embodiment can be silicon oil.

[0061] Further, as shown in Figures 1 to 4 , a fourth flow channel in communication with the cavity body 21 is arranged in the second side plate 222, and a liquid outlet 61 in communication with the fourth flow channel is arranged on one side surface of the second side plate 222, and the fourth flow channel is used to flow the cooling liquid in the cavity body 21 out to the liquid outlet 61.

[0062] Specifically, as shown in Figure 1 and Figure 4As shown in the drawings, the liquid outlet 61 is connected with a liquid outlet nozzle 62, and the liquid outlet nozzle 62 is located on the same side as the liquid inlet nozzle 32, that is, the liquid outlet nozzle 62 connected to the liquid outlet 61 penetrates out of one of the third side plates 223, so that the cooling liquid can be delivered out of the box body 22 through the liquid outlet nozzle 62.

[0063] Further, as shown in the drawings, Figure 3 and Figure 4 the fourth flow channel includes a liquid outlet main flow channel and a plurality of outlet holes 64, the liquid outlet main flow channel extends along the Y-axis, and the plurality of outlet holes 64 are uniformly and spaced arranged along the Y-axis, each outlet hole 64 is respectively communicated with the cavity 21 and the liquid outlet main flow channel, and one end of the liquid outlet main flow channel is located inside the second side plate 222, and the other end of the liquid outlet main flow channel is communicated with the liquid outlet 61, that is, the liquid outlet main flow channel does not penetrate through the entire second side plate 222 along the Y-axis.

[0064] Specifically, as shown in the drawings, Figure 3 and Figure 4 in the direction of the Y-axis and close to the liquid outlet 61, the aperture of each outlet hole 64 gradually decreases, so that the flow rate of the cooling liquid entering each outlet hole 64 is more uniform, thereby ensuring the uniformity of the flow of the cooling liquid in the entire box 2, ensuring the liquid cooling uniformity of each battery cell 1 located at different positions, and avoiding the problem of overcooling of part of the battery cells 1 and overheating of another part of the battery cells 1.

[0065] It is worth noting that, as shown in the drawings, Figure 2 the first side plate 221, the second side plate 222 and the two third side plates 223 are sealingly connected with each other to ensure the overall sealing of the box body 22; specifically, a glue groove 224 is provided on each of the first side plate 221, the second side plate 222 and the third side plate 223, and sealing glue is first applied in the glue groove 224, and then the first side plate 221, the second side plate 222 and the two third side plates 223 are connected with each other to ensure the sealing connection between the first side plate 221, the second side plate 222 and the two third side plates 223. In order to ensure the connection stability of the entire box body 22, bolts are connected between the first side plate 221, the second side plate 222 and the two third side plates 223 while being sealingly connected. Further, as shown in the drawings, Figure 1 and Figure 5 the box 2 further includes a top cover assembly 23, which is located on the top surface of the box 2 and sealingly connected to the top end opening of the box body 22 to ensure the sealing between the top cover assembly 23 and the box body 22; the top cover assembly 23 includes an upper flow channel plate 231, a second flow channel 4 is provided on the top end surface of the upper flow channel plate 231, and a first through hole 43 communicated with the cavity 21 is provided in the second flow channel 4, so as to ensure the communication between the second flow channel 4 and the cavity 21 through the first through hole 43.

[0066] Specifically, as shown in Figure 1 and Figure 5 The upflow plate 231 is horizontally arranged, and the top end surface of the upflow plate 231 is sealingly connected to the first side plate 221, the second side plate 222, and the two third side plates 223, respectively. An integrated copper bar 7 is arranged below the upflow plate 231, and the integrated copper bar 7 is electrically connected to each battery cell 1, so that the battery cells 1 can be connected in series or parallel. Two output poles 9 are connected to the two output ends of the integrated copper bar 7, respectively, and the two output poles 9 are located on the same side and are mounted on the third side plate 223, that is, the delivery pole and the liquid inlet nozzle 32 / liquid outlet nozzle 62 are located on the two third side plates 223, respectively. The sealing connection between the upflow plate 231 and the top end surface of the first side plate 221, the second side plate 222, and the two third side plates 223 can be sealed by the glue groove 224 as described above, and the specific sealing method is not limited here.

[0067] Further, as shown in Figure 5 The second flow channel 4 includes an upper main flow channel 41 and a plurality of upper branch flow channels 42. The upper main flow channel 41 extends along the Y-axis, and one end of the upper main flow channel 41 is in communication with the third flow channel 3. The upper branch flow channels 42 extend along the X-axis, and the plurality of upper branch flow channels 42 are in communication with the other end of the upper main flow channel 41, respectively. The plurality of upper branch flow channels 42 are arranged side by side along the Y-axis, and a plurality of first through holes 43 are arranged in each upper branch flow channel 42, respectively, so that the cooling liquid in the upper branch flow channel 42 can flow to the cavity body 21 through each first through hole 43.

[0068] By arranging the plurality of upper branch flow channels 42 side by side along the Y-axis, each upper branch flow channel 42 can cover the top of each battery cell 1 in the cavity body 21, ensuring that cooling liquid flows on the top of each battery cell 1, thereby ensuring uniform liquid cooling of each battery cell 1. In this embodiment, five upper branch flow channels 42 are provided, and seven first through holes 43 are provided in each upper branch flow channel 42. The number of upper branch flow channels 42 and first through holes 43 is not limited here.

[0069] Further, as shown in Figure 1 and Figure 5 The top cover assembly 23 further includes an upper cover plate 232, which is sealingly arranged on the side of the upflow plate 231 where the second flow channel 4 is provided, so as to provide a sealing effect for the second flow channel 4, ensuring that the cooling liquid can only flow along the second flow channel 4 and cannot overflow out of the upflow plate 231. The upper cover plate 232 and the upflow plate 231 can be sealingly connected by welding or glue, which is not limited here.

[0070] Specifically, as shown in Figure 5As shown, a window 2321 for injecting cooling liquid into the cavity 21 is arranged on the upper cover plate 232, and a cover plate 2322 is detachably arranged at the window 2321. When it is necessary to inject cooling liquid into the cavity 21 through the window 2321, the cover plate 2322 is removed to open the window 2321; and after the injection is completed, the cover plate 2322 is arranged on the window 2321 to close the window 2321, so as to avoid impurities such as dust from entering the cavity 21 through the window 2321.

[0071] It is worth noting that, as Figure 5 shown, the upper flow channel plate 231 is further provided with a liquid injection hole 2311 arranged below the window 2321, so that the cooling liquid can be injected into the cavity 21 through the window 2321 and the liquid injection hole 2311 in sequence; and the cover plate 2322 can cover the liquid injection hole 2311 when covering the window 2321.

[0072] Further, as Figure 1 , Figure 6 and Figure 7 shown, the box body 2 further comprises a bottom plate assembly 24 located at the bottom surface of the box body 2 and sealingly connected to the bottom end opening of the box body main body 22, so as to ensure the sealing connection between the box body main body 22 and the bottom plate assembly 24; and the bottom plate assembly 24 comprises a lower flow channel plate 241, and a first flow channel 5 is arranged at the bottom end surface of the lower flow channel plate 241, and a second through hole 53 communicating with the cavity 21 is arranged in the first flow channel 5, so as to ensure the communication between the first flow channel 5 and the cavity 21 through the second through hole 53.

[0073] Specifically, as Figure 1 and Figure 6 shown, the lower flow channel plate 241 is horizontally arranged, and the lower flow channel plate 241 is sealingly connected to the bottom end surfaces of the first side plate 221, the second side plate 222 and the two third side plates 223, respectively. The sealing connection between the lower flow channel plate 241 and the bottom end surfaces of the first side plate 221, the second side plate 222 and the two third side plates 223 can be achieved by the above-mentioned glue groove 224 sealing method, and the specific sealing method is not limited here.

[0074] Further, as Figure 6 and Figure 7As shown, the first flow channel 5 includes a lower main flow channel 51 and a plurality of lower branch flow channels 52; wherein the lower main flow channel 51 extends along the Y axis, one end of the lower main flow channel 51 communicates with the third flow channel 3; the lower branch flow channels 52 extend along the X axis, the plurality of lower branch flow channels 52 respectively communicate with the other end of the lower main flow channel 51, the plurality of lower branch flow channels 52 are arranged in parallel and spaced along the Y axis, and a plurality of second through holes 53 are respectively arranged in each lower branch flow channel 52, so that the cooling liquid in the lower branch flow channel 52 can flow to the cavity body 21 through each second through hole 53.

[0075] By arranging the plurality of lower branch flow channels 52 in parallel and spaced along the Y axis, each lower branch flow channel 52 can cover the bottom of each battery cell 1 in the cavity body 21, ensuring that cooling liquid flows at the bottom of each battery cell 1, thereby ensuring uniform liquid cooling of each battery cell 1. In this embodiment, five lower branch flow channels 52 are provided, and seven second through holes 53 are provided in each lower branch flow channel 52. Here, the number of lower branch flow channels 52 and second through holes 53 is not limited.

[0076] Further, as shown in Figure 1 and Figure 6 , the bottom plate assembly 24 further includes a lower cover plate 242, which is sealingly arranged on the side of the lower flow channel plate 241 provided with the first flow channel 5, so as to provide a sealing effect for the first flow channel 5, ensuring that the cooling liquid can only flow along the first flow channel 5 and cannot overflow out of the lower flow channel plate 241. The lower cover plate 242 and the lower flow channel plate 241 can be sealingly connected by welding or glue, which is not limited here.

[0077] Specifically, as shown in Figures 6 to 8 , a plurality of pressure relief through holes 2411 are provided on the lower flow channel plate 241, one battery cell 1 is provided corresponding to one pressure relief through hole 2411, so that when the battery cell 1 is in thermal runaway, the high-temperature and high-pressure gas generated can be discharged out of the battery module through the corresponding pressure relief through hole 2411, ensuring the safety of the battery module in thermal runaway; correspondingly, a third through hole 2421 matched with the pressure relief through hole 2411 is provided on the lower cover plate 242, that is, one pressure relief through hole 2411 is arranged in alignment with one third through hole 2421, so that the high-temperature and high-pressure gas in the pressure relief through hole 2411 can be discharged out of the battery module through the third through hole 2421, avoiding interference of the lower cover plate 242 with the pressure relief operation.

[0078] It is worth noting that the diameter of the pressure relief through hole 2411 is slightly smaller than the diameter of the battery cell 1, so that the pressure relief valve of the battery cell 1 can be arranged in front of the pressure relief through hole 2411, and the high-temperature and high-pressure gas discharged by the pressure relief valve can be discharged in a directional manner through the pressure relief through hole 2411.

[0079] It is worth mentioning that, since the plurality of lower branch flow channels 52 and the plurality of pressure relief through holes 2411 are arranged on the lower flow channel plate 241 respectively, each lower branch flow channel 52 is arranged to be bent in the X-axis direction, as shown in Figure 6 and Figure 7 The lower branch flow channel 52 is not a straight flow channel parallel to the X-axis, but a wavy bent flow channel, so that the lower branch flow channel 52 and the pressure relief through hole 2411 can be arranged to avoid each other, and the problem of the lower branch flow channel 52 and the pressure relief through hole 2411 being connected can be avoided, thereby ensuring that the pressure relief and liquid cooling of the battery module do not interfere with each other. Here, the specific bending angle and bending amplitude of the lower branch flow channel 52 are not limited, as long as the lower branch flow channel 52 and the pressure relief through hole 2411 are not connected.

[0080] Further, as shown in Figure 3 and Figure 8 An insulating sealing member 2412 is connected between the battery cell 1 and the pressure relief through hole 2411, and the insulating sealing member 2412 can be an annular insulating sealing ring; wherein an annular groove is arranged on the top end face of the lower flow channel plate 241 close to the cavity 21, and an annular groove is arranged on the outer periphery of one pressure relief through hole 2411, and the annular insulating sealing ring is installed in the annular groove; when the battery cell 1 is installed in the cavity 21, the battery cell 1 abuts against the annular insulating sealing ring, so that the pressure relief valve of the battery cell 1 is located in the pressure relief through hole 2411.

[0081] By arranging the insulating sealing member 2412, on the one hand, the battery cell 1 and the lower flow channel plate 241 can be prevented from being in direct contact, so that the battery cell 1 and the lower flow channel plate 241 are insulated from each other; on the other hand, the gap between the battery cell 1 and the pressure relief through hole 2411 can be sealed, so that the cooling liquid in the cavity 21 cannot flow out through the gap between the battery cell 1 and the pressure relief through hole 2411.

[0082] Further, as shown in Figure 1 The battery module further comprises an insulating support 8, which is installed in the cavity 21, and each battery cell 1 is installed on the insulating support 8, that is, a plurality of mounting holes 81 are arranged on the insulating support 8, and one battery cell 1 is clamped in each mounting hole 81, that is, the diameter of the mounting hole 81 is slightly smaller than the diameter of the battery cell 1, so that the battery cell 1 can be clamped and fixed in the mounting hole 81, and the battery cell 1 can be fixed in the cavity 21. The insulating support 8 is pasted in the cavity 21 by glue, that is, the insulating support 8 is pasted to the inner wall surface of the two third side plates 223 by glue.

[0083] By setting the insulating support 8, on the one hand, the electric core 1 can be fixed, and the installation support of the electric core 1 in the cavity body 21 is ensured, and on the other hand, the electric core 1 can be insulated from the lower flow channel plate 241, and the insulation effect between the electric core 1 and the lower flow channel plate 241 is better. In the embodiment, the insulating support 8 can be a plastic support.

[0084] The battery module in the embodiment adopts the mode of simultaneously flowing into the liquid along the Z axis upward and downward and flowing out of the liquid from the side, which can make the flow path of the cooling liquid in the box body 2 shorter, ensure that the cooling liquid can cool the electric core 1 in time, has a better liquid cooling effect on the electric core 1, can ensure that the number of flow channels is smaller, reduce the processing cost of the flow channel, and ensure that the entire battery module has a better heat dissipation efficiency while the cost is lower.

[0085] Embodiment two

[0086] The embodiment proposes an electric core liquid cooling method, and the electric core 1 in the battery module is liquid cooled by using the electric core liquid cooling method. As shown in Figure 9 The electric core liquid cooling method includes the following steps:

[0087] S1: filling the cooling liquid into the cavity body 21, so that the electric core 1 is immersed in the cooling liquid;

[0088] S2: respectively filling the cooling liquid into the second flow channel 4 located on the top surface and the first flow channel 5 located on the bottom surface, so that the cooling liquid flows at the top end and the bottom end of the electric core 1 respectively, and the cooling liquid in the second flow channel 4 and the first flow channel 5 flows back to the cavity body 21.

[0089] The specific liquid cooling process of the electric core liquid cooling method in the embodiment is as follows:

[0090] First, the cooling liquid is injected into the cavity body 21 through the window 2321 on the upper cover plate 232 and the liquid injection hole 2311 on the upper flow channel plate 231, so that the cooling liquid fills the entire cavity body 21. At this time, the electric core 1 is immersed in the cooling liquid.

[0091] Then, the cooling liquid is delivered into the liquid inlet and the third flow channel 3 through the liquid inlet nozzle 32, and the cooling liquid in the third flow channel 3 flows along the Z axis upward and downward, so that the cooling liquid in the third flow channel 3 flows upward along the Z axis to the upper main flow channel 41, and then flows into each upper branch flow channel 42 through the upper main flow channel 41, so that the cooling liquid flows on the top surface of the electric core 1. At the same time, the cooling liquid in the upper branch flow channel 42 flows into the cavity body 21 through each first through hole 43.

[0092] At the same time, the cooling liquid in the third flow channel 3 flows downward along the Z axis into the lower main flow channel 51, and flows into each lower branch flow channel 52 through the lower main flow channel 51, so that the cooling liquid flows on the bottom surface of the battery cell 1; at the same time, the cooling liquid in the lower branch flow channel 52 flows into the cavity 21 through each second through hole 53.

[0093] Finally, the cooling liquid in the cavity 21 after passing through the liquid-cooled battery cell 1 flows into the liquid outlet main flow channel through each outlet hole 64, so that the cooling liquid in the liquid outlet main flow channel flows out of the battery module through the liquid outlet 61 and the liquid outlet nozzle 62 in turn, thereby realizing the circulation of the cooling liquid, so that the battery cell 1 is always completely immersed in the cooling liquid, and the liquid cooling effect on the battery cell 1 is guaranteed.

[0094] The battery cell liquid cooling method in the embodiment has a shorter cooling path for the battery cell 1, a simple cooling method, and can guarantee uniform heat dissipation of each part of the battery cell 1, has a better liquid cooling effect, and guarantees a higher heat dissipation efficiency of the battery cell 1.

[0095] The above is only a preferred embodiment of the present application, and for those skilled in the art, according to the idea of the present application, the specific implementation and application range can be changed, and the content of the specification should not be understood as a limitation of the present application.

Claims

1. A battery module, characterized by, The utility model relates to a battery pack cooling device, including: Electricity core (1); Box (2), form inside cavity body (21) in it, the electricity core (1) of a plurality of parallel arrangement is placed in the cavity body (21), the cavity body (21) is filled with cooling liquid, the bottom surface and the top surface of the box (2) are provided with first flow channel (5) and second flow channel (4) respectively, and the first flow channel (5) and the second flow channel (4) are communicated with the cavity body (21) respectively to fill the cooling liquid in the cavity body (21); The side surface of the box (2) is provided with third flow channel (3), and the third flow channel (3) is communicated with the second flow channel (4) and the first flow channel (5) respectively, so that the cooling liquid in the third flow channel (3) flows to the second flow channel (4) and the first flow channel (5) respectively; The box (2) includes: Box main body (22), including the first side plate (221) in the side surface of the box (2), the first side plate (221) is provided with the third flow channel (3), the third flow channel (3) penetrates the first side plate (221) along the Z axle, and one side surface of the first side plate (221) is provided with the liquid inlet that communicates with the third flow channel (3); The box main body (22) further includes the second side plate (222) in the side surface of the box (2), the second side plate (222) is provided opposite the first side plate (221), the second side plate (222) is provided with the fourth flow channel that communicates with the cavity body (21), and one side surface of the second side plate (222) is provided with the liquid outlet (61) that communicates with the fourth flow channel, and the fourth flow channel is used for flowing the cooling liquid in the cavity body (21) to the liquid outlet (61); The box (2) further includes: Top cover assembly (23), located in the top surface of the box (2) and sealedly connected to the top end opening of the box main body (22), the top cover assembly (23) includes the upper flow channel plate (231), and the top end surface of the upper flow channel plate (231) is provided with the second flow channel (4), and the second flow channel (4) is provided with the first through hole (43) that communicates with the cavity body (21); The box (2) further includes: Bottom plate assembly (24), located in the bottom surface of the box (2) and sealedly connected to the bottom end opening of the box main body (22), the bottom plate assembly (24) includes the lower flow channel plate (241), and the bottom end surface of the lower flow channel plate (241) is provided with the first flow channel (5), and the first flow channel (5) is provided with the second through hole (53) that communicates with the cavity body (21).

2. The battery module of claim 1, wherein, The second flow channel (4) includes: Upper main flow channel (41), extend along Y axle, and one end of the upper main flow channel (41) is communicated with the third flow channel (3); A plurality of upper branch flow channels (42) extend along the X axis, and the plurality of upper branch flow channels (42) are respectively communicated with the other end of the upper main flow channel (41), the plurality of upper branch flow channels (42) are arranged in parallel along the Y axis and are spaced apart, and a plurality of first through holes (43) are respectively and spaced apart arranged in each of the upper branch flow channels (42).

3. The battery module of claim 1, wherein, The top cover assembly (23) further comprises: An upper cover plate (232) is arranged on the side of the upper flow channel plate (231) where the second flow channel (4) is arranged, and a window (2321) for injecting cooling liquid into the cavity (21) is arranged on the upper cover plate (232).

4. The battery module of claim 1, wherein, The first flow channel (5) comprises: A lower main flow channel (51) extends along the Y axis, and one end of the lower main flow channel (51) is communicated with the third flow channel (3); A plurality of lower branch flow channels (52) extend along the X axis, and the plurality of lower branch flow channels (52) are respectively communicated with the other end of the lower main flow channel (51), the plurality of lower branch flow channels (52) are arranged in parallel along the Y axis and are spaced apart, and a plurality of second through holes (53) are respectively and spaced apart arranged in each of the lower branch flow channels (52).

5. The battery module of claim 1, wherein, A plurality of pressure relief through holes (2411) are arranged on the lower flow channel plate (241), one of the battery cells (1) is arranged corresponding to one of the pressure relief through holes (2411), and an insulating sealing member (2412) is connected between the battery cell (1) and the pressure relief through hole (2411).

6. The battery module of claim 1, wherein, The battery cell (1) is a cylindrical battery cell, and the two ends of the battery cell (1) along the axial direction are respectively directed to the top surface of the box (2) and the bottom surface of the box (2), and the side walls of adjacent battery cells (1) along the radial direction abut each other.

7. A method of liquid cooling a cell, the method comprising: The battery cell (1) in the battery module according to any one of claims 1-6 is liquid-cooled by the battery cell liquid cooling method, comprising the following steps: S1: filling the cavity (21) with cooling liquid so that the battery cell (1) is immersed in the cooling liquid; S2: filling the second flow channel (4) on the top surface and the first flow channel (5) on the bottom surface with cooling liquid respectively, so that cooling liquid flows at the top end and the bottom end of the battery cell (1) respectively, and the cooling liquid in the second flow channel (4) and the first flow channel (5) flows back to the cavity (21).

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