Battery module

Abstract

The utility model discloses a battery module and belongs to the technical field of batteries. The battery module comprises a battery cell and a box body; a cavity body is formed in the box body, a plurality of battery cells which are arranged in parallel are placed in the cavity body, the cavity body is filled with cooling liquid, 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 so as to fill the cooling liquid into the cavity body. According to the battery module disclosed by the utility model, the cavity body, the first flow channel and the second flow channel which are matched with one another are arranged, so that the battery cell can be completely immersed in the circularly flowing cooling liquid for heat dissipation, uniform heat dissipation of each part of the battery cell can be ensured, the liquid cooling effect is relatively good, and the cost is relatively low.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery module. Background Art

[0002] In a battery module, for the liquid cooling method of battery cells, it is mostly to directly contact the battery cells with a liquid cooling pipe or a liquid cooling plate for cooling. This liquid cooling method requires the setting of a liquid cooling pipe or a liquid cooling plate, resulting in a relatively high cost of the battery module. Moreover, due to the limited contact area between the liquid cooling pipe or the liquid cooling plate and the battery cells, the liquid cooling effect on the battery cells is poor.

[0003] To solve the above problems, by directly immersing part of the structure of the battery cells in the coolant, the use of a liquid cooling pipe or a liquid cooling plate is not required, saving costs; however, since only part of the structure of the battery cells is immersed in the coolant, the liquid cooling effect on the battery cells cannot be guaranteed. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a battery module, which can completely immerse the battery cells in the circulating coolant for heat dissipation, can ensure uniform heat dissipation of each part of the battery cells, has a good liquid cooling effect, and has a relatively low cost.

[0005] To achieve the above object, the utility model adopts the following technical solutions:

[0006] A battery module, comprising:

[0007] Battery cells;

[0008] A box body, in which a cavity is formed. A plurality of the battery cells are placed side by side in the cavity. The cavity is filled with a coolant. A first flow channel and a second flow channel are respectively arranged on the bottom surface and the top surface of the box body, and the first flow channel and the second flow channel are respectively communicated with the cavity to fill the coolant into the cavity.

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

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

[0011] A box body main body, including a first side plate located on the side surface of the box body. The third flow channel is arranged in the first side plate. The third flow channel penetrates through the first side plate along the Z axis, and a liquid inlet communicated with the third flow channel is arranged on one side surface of the first side plate.

[0012] As an alternative, the box body further includes a second side plate located on the side of the box body. The second side plate is disposed opposite to the first side plate. A fourth flow channel communicating with the cavity body is provided in the second side plate, and a liquid outlet communicating with the fourth flow channel is provided on one side surface of the second side plate. The fourth flow channel is used to flow the coolant in the cavity body out to the liquid outlet.

[0013] As an alternative, the box further includes:

[0014] A top cover assembly, located on the top surface of the box and sealingly connected to the top opening of the box body. The top cover assembly includes 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 body is provided in the second flow channel.

[0015] As an alternative, the second flow channel includes:

[0016] An upper main flow channel, extending 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, extending along the X axis. The plurality of upper branch flow channels are respectively communicated with the other end of the upper main flow channel. The plurality of upper branch flow channels are arranged side by side at intervals along the Y axis, and a plurality of the first through holes are respectively arranged at intervals in each of the upper branch flow channels.

[0018] As an alternative, the top cover assembly further includes:

[0019] An upper cover plate, sealingly covering the side of the upper flow channel plate where the second flow channel is provided, and a window for injecting coolant into the cavity body is provided on the upper cover plate.

[0020] As an alternative, the box further includes:

[0021] A bottom plate assembly, located on the bottom surface of the box and sealingly connected to the bottom opening of the box body. The bottom plate assembly includes 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 body is provided in the first flow channel.

[0022] As an alternative, the first flow channel includes:

[0023] A lower main flow channel, extending 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, extending along the X axis. The plurality of lower branch flow channels are respectively communicated with the other end of the lower main flow channel. The plurality of lower branch flow channels are arranged side by side at intervals along the Y axis, and a plurality of the second through holes are respectively arranged at intervals in each of the lower branch flow channels.

[0025] As an alternative, a plurality of pressure relief through holes are provided on the downstream flow channel plate, one of the battery cells corresponds to one of the pressure relief through holes, and an insulating seal is connected between the battery cell and the pressure relief through hole.

[0026] As an alternative, the bottom plate assembly further includes:

[0027] A lower cover plate, which is hermetically covered on one side of the downstream flow channel plate where the first flow channel is provided.

[0028] As an alternative, the battery cell is a cylindrical battery cell, the two ends of the battery cell along the axial direction respectively face the top surface and the bottom surface of the box body, and the side walls of adjacent battery cells in the radial direction are in contact with each other.

[0029] The beneficial effects of the present utility model are:

[0030] By filling the cavity of the box body with a coolant so that the battery cells are immersed in the coolant; and filling the second flow channel located on the top surface and the first flow channel located on the bottom surface with the coolant, so that the coolant flows at both the top end and the bottom end of the battery cells, and the coolant in the second flow channel and the first flow channel flows back into the cavity; that is, the battery cells can be completely immersed in the coolant by the coolant in the cavity, the coolant in the second flow channel, and the coolant in the first flow channel, so that the battery cells can be completely immersed in the circulating coolant for cooling, ensuring uniform heat dissipation of all parts of the battery cells, with good liquid cooling effect, thereby improving the heat dissipation efficiency of the battery cells; there is no need to use liquid cooling pipes or liquid cooling plates, saving costs; and, by integrating the first flow channel and the second flow channel on the box body, there is no need to additionally add other structures for arranging the flow channels, making the cost of the entire battery module lower. Description of the Drawings

[0031] Figure 1 is an exploded structural schematic diagram of the battery module provided by the present utility model;

[0032] Figure 2 is a structural schematic diagram of the battery module (excluding the battery cells, insulating brackets, integrated copper bars, and one third side plate) provided by the present utility model;

[0033] Figure 3 is an assembly structural schematic diagram between the first side plate, the second side plate, and the downstream flow channel plate provided by the present utility model;

[0034] Figure 4 is a structural schematic diagram of the second side plate provided by the present utility model;

[0035] Figure 5 is an exploded structural schematic diagram of the top cover assembly provided by the present utility model;

[0036] Figure 6 It is a schematic exploded view of the bottom surface of the bottom plate assembly provided by the present utility model (the lower cover plate is located above);

[0037] Figure 7 It is a schematic view of the bottom surface structure of the box body (excluding the lower cover plate) provided by the present utility model;

[0038] Figure 8 It is a schematic view of the structure of the downstream channel plate provided by the present utility model;

[0039] Figure 9 It is a schematic flow chart of the battery cell liquid cooling method provided by the present utility model.

[0040] Description of the reference numerals:

[0041] 1 - Battery cell;

[0042] 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 - Upstream channel plate; 2311 - Liquid injection hole; 232 - Upper cover plate; 2321 - Window; 2322 - Shutter; 24 - Bottom plate assembly; 241 - Downstream channel plate; 2411 - Pressure relief through hole; 2412 - Insulating seal; 242 - Lower cover plate; 2421 - Third through hole;

[0043] 3 - Third channel; 32 - Liquid inlet nozzle;

[0044] 4 - Second channel; 41 - Upper main channel; 42 - Upper branch channel; 43 - First through hole;

[0045] 5 - First channel; 51 - Lower main channel; 52 - Lower branch channel; 53 - Second through hole;

[0046] 61 - Liquid outlet; 62 - Liquid outlet nozzle; 64 - Outlet hole;

[0047] 7 - Integrated copper bar; 8 - Insulating bracket; 81 - Mounting hole; 9 - Output pole. Detailed implementation manners

[0048] All features disclosed in this specification, or all steps in the disclosed methods or processes, except for mutually exclusive features and / or steps, can be combined in any manner.

[0049] Any feature disclosed in this specification, unless specifically stated, can be replaced by other equivalent or similar-purpose alternative features. That is, unless specifically stated, each feature is only an example of a series of equivalent or similar features. Throughout the specification, the same reference numerals indicate the same elements.

[0050] To make the technical problems solved, the technical solutions adopted, and the technical effects achieved by the present utility model clearer, the technical solutions of the present utility model will be further described below with reference to the accompanying drawings and through specific embodiments.

[0051] Embodiment 1

[0052] In this embodiment, a battery module is proposed. The battery module has a high heat dissipation efficiency, a simple structure, and a low cost. The battery module in this embodiment can specifically be a lithium battery module, and the specific type of the battery module is not limited herein.

[0053] Specifically, as Figures 1 to 8 shown, the battery module includes a box body 2 and a plurality of battery cells 1; wherein, an empty cavity 21 is formed inside the box body 2, and a plurality of battery cells 1 arranged side by side are placed inside the empty cavity 21. A coolant is filled inside the empty cavity 21. 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 first flow channel 5 and the second flow channel 4 are respectively communicated with the empty cavity 21 to fill the coolant into the empty cavity 21. Among them, the empty cavity 21 is filled with the coolant.

[0054] Compared with the prior art, the battery module in this embodiment changes the liquid cooling method for the battery cells 1; by filling the coolant into the empty cavity 21 of the box body 2, the battery cells 1 are immersed in the coolant; and the coolant is filled 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 coolant flows at both the top end and the bottom end of the battery cells 1, and the coolant in the second flow channel 4 and the first flow channel 5 flows back into the empty cavity 21; that is, through the coolant in the empty cavity 21, the coolant in the second flow channel 4, and the coolant in the first flow channel 5, the battery cells 1 can be completely immersed in the coolant, so that the battery cells 1 can be completely immersed in the circulating coolant for cooling, ensuring uniform heat dissipation for each part of the battery cells 1, with a good liquid cooling effect, thereby improving the heat dissipation efficiency of the battery cells 1; there is no need to use liquid cooling pipes or liquid cooling plates, with a simple structure and cost savings; and, the second flow channel 4 and the first flow channel 5 are integrally arranged on the box body 2, without the need to additionally increase other structures for arranging the flow channels, making the structure of the entire battery module simpler and the cost lower.

[0055] It is worth noting that the battery cells 1 in this embodiment are specifically cylindrical battery cells. The two ends of the battery cells 1 along the axial direction respectively face the top surface and the bottom surface of the box body 2, and the side walls of adjacent battery cells 1 in the radial direction are in contact with each other, so as to improve the energy density of the battery module while ensuring heat dissipation.

[0056] Specifically, as Figures 1 to 3As shown, a third flow channel 3 is provided on the side surface of the box body 2. The third flow channel 3 is respectively communicated with the second flow channel 4 and the first flow channel 5, so that the coolant in the third flow channel 3 flows into the second flow channel 4 and the first flow channel 5 respectively.

[0057] Further, as Figures 1 to 3 shown, 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. The third flow channel 3 is provided in the first side plate 221. The third flow channel 3 penetrates through the first side plate 221 along the Z axis, and a liquid inlet communicating with the third flow channel 3 is provided on one side surface of the first side plate 221.

[0058] Specifically, as Figure 1 and Figure 2 shown, the box body main body 22 further includes a second side plate 222 and two third side plates 223 respectively located on the side surface of the box body 2. The second side plate 222 is disposed opposite to the first side plate 221, and the two third side plates 223 are disposed opposite to each other. The first side plate 221, the second side plate 222 and the two third side plates 223 are surrounded and connected to form a square structure. That is, the box body main body 22 is a square structure with an opening. The box body main body 22 specifically has a top opening and a bottom opening that are communicated with each other.

[0059] Specifically, as Figure 1 and Figure 3 shown, a liquid inlet nozzle 32 is connected to the liquid inlet. That is, the liquid inlet nozzle 32 passes through one of the third side plates 223 and then is connected to the liquid inlet, so that the coolant can be conveyed to the liquid inlet and the third flow channel 3 through the liquid inlet nozzle 32. The coolant in this embodiment may specifically be silicone oil.

[0060] Further, as Figures 1 to 4 shown, a fourth flow channel communicating with the cavity body 21 is provided in the second side plate 222, and a liquid outlet 61 communicating with the fourth flow channel is provided on one side surface of the second side plate 222. The fourth flow channel is used to flow out the coolant in the cavity body 21 to the liquid outlet 61.

[0061] Specifically, as Figure 1 and Figure 4 shown, a liquid outlet nozzle 62 is connected to the liquid outlet 61. The liquid outlet nozzle 62 and the liquid inlet nozzle 32 are located on the same side surface. 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 coolant can be conveyed out of the box body main body 22 through the liquid outlet nozzle 62.

[0062] Further, as Figure 3 and Figure 4As shown, the fourth flow channel includes a main liquid outlet flow channel and a plurality of liquid outlet holes 64. The main liquid outlet flow channel extends along the Y-axis. The plurality of liquid outlet holes 64 are evenly and spaced along the Y-axis. Each liquid outlet hole 64 is respectively communicated with the cavity body 21 and the main liquid outlet flow channel. One end of the main liquid outlet flow channel is located inside the second side plate 222, and the other end of the main liquid outlet flow channel is communicated with the liquid outlet 61. That is, the main liquid outlet flow channel does not penetrate the entire second side plate 222 along the Y-axis.

[0063] Specifically, as Figure 3 and Figure 4 shown, in the direction of the Y-axis and close to the liquid outlet 61, the aperture diameters of the respective liquid outlet holes 64 gradually decrease, so as to ensure that the flow rates of the coolant entering the respective liquid outlet holes 64 are relatively uniform, thereby ensuring the flow uniformity of the coolant in the entire box body 2, ensuring the liquid cooling uniformity of the respective battery cells 1 located at different positions, and avoiding the problem that some battery cells 1 are over-cooled while some other battery cells 1 are over-heated.

[0064] It should be noted that, as Figure 2 shown, the first side plate 221, the second side plate 222, and the two third side plates 223 are hermetically connected to each other to ensure the overall sealing performance of the box body main body 22; specifically, glue grooves 224 are respectively provided on the first side plate 221, the second side plate 222, and the third side plates 223. First, a sealing glue is applied in the glue grooves 224, and then the first side plate 221, the second side plate 222, and the two third side plates 223 are surrounded and connected to 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. Among them, in order to ensure the connection stability of the entire box body main body 22, bolts are connected between the first side plate 221, the second side plate 222, and the two third side plates 223 while performing the sealing connection. Further, as Figure 1 and Figure 5 shown, the box body 2 further includes a top cover assembly 23. The top cover assembly 23 is located on the top surface of the box body 2 and is hermetically connected to the top opening of the box body main body 22 to ensure the sealing performance between the top cover assembly 23 and the box body main body 22; the top cover assembly 23 includes an upper flow channel plate 231. A second flow channel 4 is provided on the top surface of the upper flow channel plate 231, and a first through hole 43 communicated with the cavity body 21 is provided in the second flow channel 4 to ensure the communication between the second flow channel 4 and the cavity body 21 through the first through hole 43.

[0065] Specifically, as Figure 1 and Figure 5As shown, the upper flow channel plate 231 is horizontally arranged, and the upper flow channel plate 231 is hermetically connected to the top surfaces of the first side plate 221, the second side plate 222, and the two third side plates 223 respectively; and, an integrated copper row 7 is arranged below the upper flow channel plate 231, and the integrated copper row 7 is electrically connected to each battery cell 1 respectively, so as to be able to connect each battery cell 1 in series or in parallel. Wherein, two output poles 9 are respectively connected to the two output ends of the integrated copper row 7, and the two output poles 9 are located on the same side and are both mounted on the third side plate 223, that is, the conveying pole and the above-mentioned liquid inlet nozzle 32 / liquid outlet nozzle 62 are respectively located on the two third side plates 223. Wherein, the hermetic connection between the upper flow channel plate 231 and the top surfaces of the first side plate 221, the second side plate 222, and the two third side plates 223 can adopt the above-mentioned glue groove 224 sealing method, and here, the specific sealing method is not limited.

[0066] Further, as Figure 5 shown, the second flow channel 4 includes an upper main flow channel 41 and a plurality of upper branch flow channels 42; wherein, the upper main flow channel 41 extends along the Y axis, and one end of the upper main flow channel 41 is communicated with the third flow channel 3; the upper branch flow channels 42 extend along the X axis, and a plurality of upper branch flow channels 42 are respectively communicated with the other end of the upper main flow channel 41, and the plurality of upper branch flow channels 42 are arranged side by side at intervals along the Y axis, and a plurality of first through holes 43 are respectively arranged at intervals in each upper branch flow channel 42, so as to be able to make the coolant in the upper branch flow channel 42 flow to the cavity body 21 through each first through hole 43.

[0067] By arranging a plurality of upper branch flow channels 42 arranged side by side at intervals along the Y axis, it is possible to cover the tops of each battery cell 1 in the cavity body 21 through each upper branch flow channel 42, ensuring that coolant flows on the tops of each battery cell 1, so as to ensure the liquid cooling uniformity 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. Here, the setting numbers of the upper branch flow channels 42 and the first through holes 43 are not limited.

[0068] Further, as Figure 1 and Figure 5 shown, the top cover assembly 23 further includes an upper cover plate 232, and the upper cover plate 232 is hermetically covered on the side surface of the upper flow channel plate 231 where the second flow channel 4 is provided, so as to be able to provide a sealing effect for the second flow channel 4, ensuring that the coolant can only flow along the second flow channel 4 and will not overflow outside the upper flow channel plate 231. Wherein, the upper cover plate 232 and the upper flow channel plate 231 can be hermetically connected by welding or glue fixing, and here, it is not specifically limited.

[0069] Specifically, as Figure 5As shown, a window 2321 for injecting coolant into the cavity 21 is provided on the upper cover plate 232. And a baffle plate 2322 is detachably covered at the window 2321. When it is necessary to inject coolant into the cavity 21 through the window 2321, the baffle plate 2322 is removed to open the window 2321. After the injection is completed, the baffle plate 2322 is covered on the window 2321 again to close the window 2321 and prevent impurities such as dust from entering the cavity 21 through the window 2321.

[0070] It should be noted that, as Figure 5 shown, a liquid injection hole 2311 is also provided on the upstream flow channel plate 231. The liquid injection hole 2311 is correspondingly arranged below the window 2321 so as to be able to inject coolant into the cavity 21 successively through the window 2321 and the liquid injection hole 2311. And the baffle plate 2322 can cover the liquid injection hole 2311 while blocking the window 2321.

[0071] Furthermore, as Figure 1 、 Figure 6 and Figure 7 shown, the box body 2 further includes a bottom plate assembly 24. The bottom plate assembly 24 is located at the bottom surface of the box body 2 and is hermetically connected to the bottom opening of the box body main body 22 to ensure the hermetic connection between the box body main body 22 and the bottom plate assembly 24. And the bottom plate assembly 24 includes a downstream flow channel plate 241. A first flow channel 5 is provided on the bottom end surface of the downstream flow channel plate 241. A second through hole 53 communicating with the cavity 21 is provided 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.

[0072] Specifically, as Figure 1 and Figure 6 shown, the downstream flow channel plate 241 is horizontally arranged. The downstream flow channel plate 241 is hermetically 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. Among them, the hermetic connection between the downstream 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 adopt the above-mentioned glue groove 224 hermetic sealing method. Here, the specific sealing method is not limited.

[0073] Furthermore, 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, and 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, and the plurality of lower branch flow channels 52 respectively communicate with the other end of the lower main flow channel 51, and the plurality of lower branch flow channels 52 are arranged side by side at intervals along the Y-axis, and a plurality of second through holes 53 are respectively arranged at intervals in each lower branch flow channel 52, so that the coolant in the lower branch flow channel 52 can flow through each second through hole 53 to the cavity body 21.

[0074] By arranging a plurality of lower branch flow channels 52 arranged side by side at intervals along the Y-axis, the bottom of each battery cell 1 in the cavity body 21 can be covered by each lower branch flow channel 52, ensuring that coolant flows at the bottom of each battery cell 1, thereby ensuring the liquid cooling uniformity 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 setting numbers of the lower branch flow channels 52 and the second through holes 53 are not limited.

[0075] Furthermore, as Figure 1 and Figure 6 shown, the bottom plate assembly 24 further includes a lower cover plate 242, and the lower cover plate 242 is hermetically covered on one side of the lower flow channel plate 241 where the first flow channel 5 is provided, so as to provide a sealing effect for the first flow channel 5, ensuring that the coolant can only flow along the first flow channel 5 and will not overflow outside the lower flow channel plate 241. Among them, the lower cover plate 242 and the lower flow channel plate 241 can be hermetically connected by welding or glue fixing, and the specific limitation is not made here.

[0076] Specifically, as Figures 6 to 8 shown, a plurality of pressure relief through holes 2411 are provided on the lower flow channel plate 241, and one battery cell 1 is correspondingly arranged with one pressure relief through hole 2411, so that when the battery cell 1 has a thermal runaway, the generated high-temperature and high-pressure gas can be discharged outside the battery module through the corresponding pressure relief through hole 2411, ensuring the safety of the battery module during thermal runaway; correspondingly, a third through hole 2421 matching the pressure relief through hole 2411 is provided on the lower cover plate 242, that is, one pressure relief through hole 2411 is aligned with one third through hole 2421, so as to ensure that the high-temperature and high-pressure gas in the pressure relief through hole 2411 can be discharged outside the battery module through the third through hole 2421, avoiding interference of the lower cover plate 242 with the pressure relief operation.

[0077] It should be noted that the diameter of the pressure relief through hole 2411 is slightly smaller than the diameter of the battery cell 1, so as to ensure that the pressure relief valve of the battery cell 1 is directly opposite to the pressure relief through hole 2411, ensuring that the high-temperature and high-pressure gas discharged by the pressure relief valve can be directionally discharged through the pressure relief through hole 2411.

[0078] It should be noted that since a plurality of lower branch channels 52 and a plurality of pressure relief through holes 2411 are respectively provided on the lower runner plate 241, each lower branch channel 52 is bent on the X-axis, as Figure 6 and Figure 7 shown. The lower branch channel 52 is not a straight channel parallel to the X-axis, but a bent channel in a wavy line, so that the lower branch channel 52 and the pressure relief through hole 2411 can be avoided from each other through the bending setting, and the problem that the lower branch channel 52 is communicated with the pressure relief through hole 2411 will not occur, thereby ensuring that the pressure relief work and the liquid cooling work of the battery module do not interfere with each other. Here, the specific bending angle and bending amplitude of the lower branch channel 52 are not limited, as long as it is ensured that the lower branch channel 52 is not communicated with the pressure relief through hole 2411.

[0079] Furthermore, as Figure 3 and Figure 8 shown, an insulating seal 2412 is connected between the battery cell 1 and the pressure relief through hole 2411. The insulating seal 2412 can specifically be an annular insulating sealing ring; wherein, an annular groove is provided on the top surface of the lower runner plate 241 close to the cavity body 21. An annular groove is provided around the outer circumference of a 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 body 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.

[0080] By providing the insulating seal 2412, on the one hand, it can avoid the direct contact between the battery cell 1 and the lower runner plate 241, so that the battery cell 1 and the lower runner plate 241 are insulated from each other; on the other hand, it can seal the gap between the battery cell 1 and the pressure relief through hole 2411, and avoid the coolant in the cavity body 21 from flowing out through the gap between the pressure relief through hole 2411 and the battery cell 1.

[0081] Furthermore, as Figure 1 shown, the battery module further includes an insulating bracket 8. The insulating bracket 8 is installed in the cavity body 21, and each battery cell 1 is installed on the insulating bracket 8. That is, a plurality of mounting holes 81 are provided on the insulating bracket 8, and a battery cell 1 is clamped in one mounting hole 81. That is, the diameter of the mounting hole 81 is slightly smaller than the diameter of the battery cell 1, so as to be able to clamp and fix the battery cell 1 in the mounting hole 81 to fix the battery cell 1 in the cavity body 21. Among them, the insulating bracket 8 is pasted in the cavity body 21 by glue, that is, the insulating bracket 8 is adhesively bonded to the inner wall surfaces of the two third side plates 223 by glue respectively.

[0082] By setting the insulating bracket 8, on the one hand, it can be used to fix the battery cell 1 to ensure the installation and support of the battery cell 1 in the cavity 21, and on the other hand, it can insulate the battery cell 1 from the downstream flow channel plate 241 to ensure better insulation between the battery cell 1 and the downstream flow channel plate 241. In this embodiment, the insulating bracket 8 can specifically be a plastic bracket.

[0083] In this embodiment, the battery module adopts the method of simultaneously feeding liquid from above and below along the Z-axis and discharging liquid from the side, which can make the flow path of the coolant in the box body 2 shorter, ensure that the coolant can cool the battery cell 1 in time, so as to have a better liquid cooling effect on the battery cell 1, and at the same time, it can ensure that the number of flow channels is less, reduce the processing cost of the flow channels, and ensure that the entire battery module has better heat dissipation efficiency while having a lower cost.

[0084] Embodiment Two

[0085] In this embodiment, a battery cell liquid cooling method is proposed, and the battery cell 1 in the above battery module is liquid-cooled by adopting this battery cell liquid cooling method. As Figure 9 shown, the battery cell liquid cooling method includes the following steps:

[0086] S1: Fill the cavity 21 with coolant so that the battery cell 1 is immersed in the coolant;

[0087] S2: Supply coolant to the third flow channel 3 so that the coolant in the third flow channel 3 flows into the second flow channel 4 located on the top surface and the first flow channel 5 located on the bottom surface respectively, so that there is coolant flowing at the top and bottom ends of the battery cell 1, and the coolant in the second flow channel 4 and the first flow channel 5 flows back into the cavity 21.

[0088] The specific liquid cooling process of the battery cell liquid cooling method in this embodiment is as follows:

[0089] First, inject coolant into the cavity 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 coolant fills the entire cavity 21. At this time, the battery cell 1 is immersed in the coolant.

[0090] Then, transport the coolant to the liquid inlet and the third flow channel 3 through the liquid inlet nozzle 32, and make the coolant in the third flow channel 3 flow up and down along the Z-axis, so that the coolant in the third flow channel 3 flows upward along the Z-axis into the upper main flow channel 41 and flows into each upper branch flow channel 42 through the upper main flow channel 41, so that there is coolant flowing on the top surface of the battery cell 1; at the same time, the coolant in the upper branch flow channel 42 flows into the cavity 21 through each first through hole 43.

[0091] Meanwhile, the coolant in the third flow channel 3 flows downward along the Z-axis into the lower main flow channel 51, and then flows into each lower branch flow channel 52 through the lower main flow channel 51, so that the coolant flows on the bottom surface of the battery cell 1; meanwhile, the coolant in the lower branch flow channel 52 flows into the cavity 21 through each second through hole 53.

[0092] Finally, the coolant in the cavity 21 after passing through the liquid-cooled battery cell 1 flows through each outlet hole 64 into the liquid outlet main flow channel, so that the coolant 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 sequence, thereby realizing the circulating flow of the coolant, making the battery cell 1 always completely immersed in the coolant, and ensuring the liquid cooling effect on the battery cell 1.

[0093] In the battery cell liquid cooling method of this embodiment, the cooling path for the battery cell 1 is short, the cooling method is simple, and it can ensure uniform heat dissipation for each part of the battery cell 1, with a good liquid cooling effect and a high heat dissipation efficiency for the battery cell 1.

[0094] The above content is only the preferred embodiment of the present utility model. For those of ordinary skill in the art, according to the idea of the present utility model, there will be changes in the specific implementation manner and application scope. The content of this specification should not be construed as a limitation to the present utility model.

Claims

1. A battery module, characterized in that: include: Battery cell (1); A box (2) is formed with a cavity (21) therein, a plurality of battery cells (1) arranged in parallel are placed in the cavity (21), the cavity (21) is filled with a cooling liquid, a first flow channel (5) and a second flow channel (4) are respectively provided on the bottom surface and the top surface of the box (2), and the first flow channel (5) and the second flow channel (4) are respectively connected to the cavity (21) so as to fill the cavity (21) with cooling liquid.

2. The battery module according to claim 1, characterized in that: A third flow channel (3) is provided on the side of the box body (2), and the third flow channel (3) is connected to the second flow channel (4) and the first flow channel (5) respectively, so that the coolant in the third flow channel (3) flows to the second flow channel (4) and the first flow channel (5) respectively.

3. The battery module according to claim 2, characterized in that: The housing (2) comprises: The box body (22) comprises a first side plate (221) located on the side of the box body (2), the third flow channel (3) being arranged in the first side plate (221), the third flow channel (3) penetrating the first side plate (221) along the Z axis, and a liquid inlet communicating with the third flow channel (3) being arranged on one side of the first side plate (221).

4. The battery module according to claim 3, characterized in that: The box body (22) further comprises a second side plate (222) located on a side of the box body (2); the second side plate (222) is arranged opposite to the first side plate (221); a fourth flow channel connected to the cavity (21) is arranged in the second side plate (222); and a liquid outlet (61) connected to the fourth flow channel is arranged on one side of the second side plate (222); the fourth flow channel is used to allow the cooling liquid in the cavity (21) to flow out to the liquid outlet (61).

5. The battery module according to claim 3 or 4, characterized in that: The box (2) also includes: A top cover assembly (23) is located on the top surface of the box body (2) and is sealed to the top end opening of the box body main body (22), the top cover assembly (23) comprising an upper flow channel plate (231), the top end surface of the upper flow channel plate (231) being provided with the second flow channel (4), and the second flow channel (4) being provided with a first through hole (43) communicating with the cavity (21).

6. The battery module according to claim 5, characterized in that: The second flow channel (4) comprises: An upper main flow channel (41) extends along the Y axis, and one end of the upper main flow channel (41) is connected to the third flow channel (3); A plurality of upper branch flow channels (42), the upper branch flow channels (42) extending along the X-axis, the plurality of upper branch flow channels (42) being respectively connected to the other end of the upper main flow channel (41), the plurality of upper branch flow channels (42) being arranged side by side at intervals along the Y-axis, and a plurality of the first through holes (43) being respectively arranged at intervals in each of the upper branch flow channels (42).

7. The battery module according to claim 5, characterized in that: The top cover assembly (23) further comprises: An upper cover plate (232), a sealing cover is arranged on a side of the upper flow channel plate (231) on which 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).

8. The battery module according to claim 3 or 4, characterized in that: The box (2) also includes: A bottom plate assembly (24) is located on the bottom surface of the box body (2) and is sealed to the bottom opening of the box body main body (22), the bottom plate assembly (24) comprising a lower flow channel plate (241), the lower end surface of the lower flow channel plate (241) being provided with the first flow channel (5), and the first flow channel (5) being provided with a second through hole (53) communicating with the cavity (21).

9. The battery module according to claim 8, characterized in that: The first flow channel (5) comprises: A lower main flow channel (51) extending along the Y axis, one end of the lower main flow channel (51) being connected to the third flow channel (3); A plurality of lower branch flow channels (52), the lower branch flow channels (52) extending along the X-axis, the plurality of lower branch flow channels (52) respectively connected to the other end of the lower main flow channel (51), the plurality of lower branch flow channels (52) arranged side by side at intervals along the Y-axis, and a plurality of second through holes (53) respectively arranged at intervals in each of the lower branch flow channels (52).

10. The battery module according to claim 8, characterized in that: A plurality of pressure relief through holes (2411) are provided on the lower flow channel plate (241), one of the battery cells (1) is provided 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).

11. The battery module according to claim 8, characterized in that: The base plate assembly (24) further comprises: A lower cover plate (242), the lower cover plate (242) being a sealing cover and arranged on a side surface of the lower flow channel plate (241) on which the first flow channel (5) is arranged.

12. The battery module according to any one of claims 1 to 4, characterized in that: The battery core (1) is a cylindrical battery core, and the two ends of the battery core (1) along the axial direction face the top surface of the box body (2) and the bottom surface of the box body (2) respectively, and the radial side walls of adjacent battery cores (1) abut against each other.

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