Battery module and battery pack

Abstract

The utility model discloses a battery module and battery pack, the battery module includes: module shell and battery cell module, module shell is internally formed with a plurality of immersion cooling chamber along the first direction arrangement, each immersion cooling chamber is provided with the cooling liquid inlet and cooling liquid outlet on the module shell, the plurality of battery cell modules are in one-to-one correspondence with the plurality of immersion cooling cavities; and the battery cell modules are placed in the corresponding immersion cooling cavities. According to the battery module disclosed by the utility model, the cooling liquid can be simultaneously conveyed into the plurality of immersion cooling cavities through the plurality of cooling liquid inlets, so that the plurality of battery cell modules can be synchronously cooled, the uniform cooling of the plurality of battery cell modules is ensured, and meanwhile, the flowing path of the cooling liquid in each immersion cooling cavity is shorter; and the number of the battery cells needing to be cooled by the cooling liquid entering each immersion cooling cavity is smaller, so that the cooling effect of the cooling liquid on the battery cell module can be improved, and the safety of the battery module is improved.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a battery module and a battery pack. Background Technology

[0002] The contemporary automotive industry is undergoing a revolutionary change, with traditional gasoline-powered vehicles gradually being replaced by new energy vehicles, among which pure electric vehicles are emerging as a type of new energy vehicle. As people have higher demands for the range of electric vehicles, the same battery parameters mean a longer driving range. This requires more battery cells to be placed in the battery pack, and with the increase in the number of cells, the cooling requirements for the cells also increase. Various cooling methods exist, such as liquid cooling plates and immersion cooling. However, immersion cooling, among these technologies, has unsatisfactory cooling effects. If all the cells are placed in the same enclosure, uneven distribution of coolant within the enclosure will lead to poor cooling in some areas. Therefore, improvements are needed. Utility Model Content

[0003] The first aspect of this utility model proposes a battery module, which has the advantages of good cooling effect and high safety.

[0004] A battery module according to a first aspect of the present invention includes: a module housing having a plurality of immersion cooling chambers arranged along a first direction therein, each of the immersion cooling chambers having a coolant inlet and a coolant outlet formed on the module housing; and a battery cell module having a plurality of cells corresponding one-to-one with the plurality of immersion cooling chambers, the battery cell module being placed in the corresponding immersion cooling chamber.

[0005] According to the battery module of the first aspect of the present invention, coolant can be simultaneously delivered to multiple immersion cooling chambers through multiple coolant inlets, which can realize the synchronous cooling of multiple cell modules to ensure uniform cooling of multiple cell modules. At the same time, the flow path of coolant in each immersion cooling chamber is shorter, and fewer cell modules need to be cooled by coolant entering each immersion cooling chamber, thereby improving the cooling effect of coolant on cell modules and improving the safety of battery module.

[0006] According to some embodiments of the present invention, the coolant inlet is located at the bottom of the immersion cooling chamber, and the coolant outlet is located at the top of the immersion cooling chamber.

[0007] According to some embodiments of the present invention, the coolant inlet and the coolant outlet are respectively located on opposite sides of the module housing in a second direction.

[0008] According to some embodiments of the present invention, the ratio of the distance between the coolant inlet and the lower end of the module housing to the height of the module housing is no more than 0.4; and / or, the cell module includes multiple cells, and the coolant outlet is higher than the uppermost cell in the cell module.

[0009] According to some embodiments of the present invention, the battery cell module includes a plurality of battery cells arranged at intervals along the vertical direction and the second direction, and a coolant flow channel is formed between any two adjacent battery cells.

[0010] According to some embodiments of the present invention, the multiple cells of each cell module constitute multiple groups of cells arranged at intervals in a second direction. Each group of cells includes multiple cells arranged at intervals in a vertical direction. The coolant flow channel formed between two adjacent cells in the second direction is a first flow channel, and the coolant flow channel formed between two adjacent cells in the vertical direction is a second flow channel. The width of the second flow channel is greater than the width of the first flow channel.

[0011] According to some embodiments of the present invention, the ratio of the width of the first flow channel to the diameter of the battery cell is in the range of 0.02 to 0.1; and / or, the ratio of the width of the first flow channel to the diameter of the battery cell is in the range of 0.02 to 0.2.

[0012] According to some embodiments of the present invention, the width of the coolant flow channel ranges from 0.5 to 4 mm.

[0013] According to some embodiments of the present invention, the module housing includes a top cover, a box body, and partitions. An upwardly open mounting cavity is formed inside the box body. The partitions have a plurality of partitions spaced apart inside the box body along the first direction. The plurality of partitions are used to divide the mounting cavity into a plurality of immersion cooling cavities. The top cover is located at the upper end of the box body and is used to block the opening of the immersion cooling cavity. And / or, the weight ratio of the coolant in the immersion cooling cavity to the weight of the battery cell module does not exceed 1.5.

[0014] The second aspect of this utility model proposes a battery pack.

[0015] The battery pack according to a second aspect of the present invention includes: the battery module described above.

[0016] According to the battery pack of the second aspect of this utility model, coolant can be simultaneously delivered to multiple immersion cooling chambers through multiple coolant inlets, which can realize the synchronous cooling of multiple cell modules to ensure uniform cooling of multiple cell modules. At the same time, the flow path of coolant in each immersion cooling chamber is shorter, and fewer cell modules need to be cooled by coolant entering each immersion cooling chamber, thereby improving the cooling effect of coolant on cell modules and improving the safety of battery module.

[0017] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of a battery module according to an embodiment of the present utility model;

[0019] Figure 2 This is an exploded view of the battery module according to an embodiment of the present utility model;

[0020] Figure 3 This is a side view of a battery module according to an embodiment of the present utility model;

[0021] Figure 4 This is a schematic diagram of the cell module of the battery module according to an embodiment of the present utility model;

[0022] Figure 5 This is an exploded view of the cell module of the battery module according to an embodiment of the present utility model;

[0023] Figure 6 This is a cross-sectional view of the cell module of the battery module according to an embodiment of the present utility model;

[0024] Figure 7 This is a front view of the battery cell and mounting bracket of the battery module according to an embodiment of the present utility model;

[0025] Figure 8 yes Figure 7 Enlarged view of region A in the middle;

[0026] Figure 9 This is a schematic diagram of the fixing frame and some battery cells of the battery module according to an embodiment of the present utility model;

[0027] Figure 10 This is a schematic diagram of a battery pack according to an embodiment of the present utility model;

[0028] Figure 11 This is a schematic diagram of the battery pack with the upper casing removed according to an embodiment of the present invention.

[0029] Figure label:

[0030] 1000, battery pack;

[0031] 100. Battery module;

[0032] 1. Module housing; 11. Immersion cooling chamber; 12. Coolant inlet; 13. Coolant outlet; 14. Top cover; 15. Housing; 16. Partition;

[0033] 2. Battery cell module; 21. Battery cell; 22. Coolant flow channel; 22a. First flow channel; 22b. Second flow channel; 23. Mounting bracket; 231. Mounting slot; 24. Insulating cover plate; 25. Busbar;

[0034] 3. High-voltage output connector; 4. Information acquisition connector;

[0035] 200, Inlet pipe; 300, Drain pipe; 400, Battery casing; 410, Upper casing; 420, Lower casing; 500, Battery management system;

[0036] e1, first direction; e2, second direction. Detailed Implementation

[0037] The embodiments of this utility model are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0038] The following disclosure provides numerous different embodiments or examples for implementing various structures of the present invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of the invention. Furthermore, reference numerals and / or letters may be repeated in different examples. Such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, examples of various specific processes and materials are provided in this invention; however, those skilled in the art will recognize the applicability of other processes and / or the use of other materials.

[0039] The battery module 100 according to a first aspect embodiment of the present invention is described below with reference to the accompanying drawings.

[0040] like Figures 1 to 11As shown, the battery module 100 according to a first aspect embodiment of the present invention includes: a module housing 1 and a cell module 2. The module housing 1 has a plurality of immersion cooling chambers 11 arranged along a first direction e1. Each immersion cooling chamber 11 has a coolant inlet 12 and a coolant outlet 13 formed on the module housing 1. The cell module 2 has a plurality of cells corresponding one-to-one with the plurality of immersion cooling chambers 11, and the cell module 2 is placed in the corresponding immersion cooling chamber 11. The first direction e1 is perpendicular to the vertical direction, such as the length direction of the battery module 100.

[0041] In other words, multiple battery cell modules 2 are placed in multiple separate immersion cooling chambers 11. Each immersion cooling chamber 11 is equipped with an independent coolant inlet 12 and a coolant outlet 13, thereby providing an independent cooling space for each battery cell module 2. The coolant can enter the immersion cooling chamber 11 through the coolant inlet 12 and flow out through the coolant outlet 13. During the flow of the coolant in the immersion cooling chamber 11, it can absorb the heat of the battery cell module 2 through heat exchange with the battery cell module 2, thereby cooling the battery cell module 2.

[0042] It is understandable that when multiple battery cell modules are installed in the same cavity, as the coolant flows into and out of the cavity, the cooling effect gradually weakens due to the continuous absorption of heat by the coolant during the flow. This results in the battery cell modules closer to the coolant inflow position having a much higher cooling effect than those closer to the coolant outflow position.

[0043] Therefore, in this application, by placing multiple battery cell modules 2 in multiple separate immersion cooling chambers 11, and simultaneously supplying coolant to the multiple immersion cooling chambers 11 through multiple coolant inlets 12, synchronous cooling of multiple battery cell modules 2 can be achieved to ensure uniform cooling of multiple battery cell modules 2. At the same time, the flow path of coolant in each immersion cooling chamber 11 is shorter, and fewer battery cells 21 need to be cooled by the coolant entering each immersion cooling chamber 11, thereby improving the cooling effect of coolant on battery cell modules 2 and improving the safety of battery module 100.

[0044] According to the battery module 100 of the first aspect of the present invention, coolant can be simultaneously delivered to multiple immersion cooling chambers 11 through multiple coolant inlets 12, which can realize the synchronous cooling of multiple cell modules 2 to ensure uniform cooling of multiple cell modules 2. At the same time, the flow path of coolant in each immersion cooling chamber 11 is shorter, and fewer cell modules 21 need to be cooled by coolant entering each immersion cooling chamber 11, thereby improving the cooling effect of coolant on cell modules 2 and improving the safety of battery module 100.

[0045] According to some embodiments of this utility model, the coolant inlet 12 is located at the bottom of the immersion cooling chamber 11, and the coolant outlet 13 is located at the top of the immersion cooling chamber 11. That is, the coolant enters the immersion cooling chamber 11 from the bottom and exits through the top, meaning the overall flow trend of the coolant within the immersion cooling chamber 11 is from bottom to top. Therefore, as the coolant flows from bottom to top, it can gradually cool the battery cell module 2, while ensuring that the coolant can better fill the immersion cooling chamber 11. This avoids the risk that the portion of the battery cell module 2 near the top of the immersion cooling chamber 11 cannot contact the coolant, thus ensuring the effective cooling of the battery cell module 2 through immersion cooling.

[0046] According to some embodiments of this utility model, the coolant inlet 12 and the coolant outlet 13 are located on opposite sides of the module housing 1 in the second direction e2. That is, the coolant inlet 12 and the coolant outlet 13 are approximately diagonally distributed. Therefore, after the coolant enters the immersion cooling chamber 11 through the coolant inlet 12, in addition to flowing from bottom to top, it also needs to flow along the second direction e2 towards the coolant outlet 13 before being discharged through the coolant outlet 13. This ensures that the coolant flow path within the immersion cooling chamber 11 can better cover the battery cell module 2, thereby improving the cooling effect on the battery cell module 2.

[0047] According to some embodiments of this utility model, the distance between the coolant inlet 12 and the lower end of the module housing 1 (e.g.) Figure 2 The height of h1 shown is the same as the height of the module housing 1 (as shown in the figure). Figure 2 The ratio of h2 shown does not exceed 0.4. It can be understood that the smaller the ratio of the distance between the coolant inlet 12 and the lower end of the module housing 1 to the height of the module housing 1, the closer the coolant inlet 12 is to the inner bottom surface of the immersion cooling cavity 11 in the vertical direction. Conversely, the greater the ratio, the larger the flow dead zone within the immersion cooling cavity 11 located below the coolant inlet 12. Therefore, by controlling the ratio of the distance between the coolant inlet 12 and the lower end of the module housing 1 to the height of the module housing 1 to not exceed 0.4, it is possible to avoid an excessively large flow dead zone within the immersion cooling cavity 11 caused by an excessively large vertical distance between the coolant inlet 12 and the inner bottom surface of the immersion cooling cavity 11. This prevents poor cooling performance in the area of ​​the battery cell module 2 located below the coolant inlet 12, ensuring uniform cooling of the battery cell module 2.

[0048] According to some embodiments of this utility model, the battery cell module 2 includes multiple battery cells 21, and the coolant outlet 13 is higher than the uppermost battery cell 21 in the battery cell module 2. That is, the coolant outlet 13 is located above the uppermost battery cell 21 in the corresponding battery cell module 2. Therefore, before the coolant is discharged from the immersion cooling chamber 11 through the coolant outlet 13, the coolant in the immersion cooling chamber 11 can completely immerse all the battery cells 21 in the battery cell module 2, thereby avoiding the problem that some of the higher-positioned battery cells 21 cannot be cooled due to the coolant outlet 13 being too low, thus ensuring the cooling effect of the coolant on the battery cell module 2.

[0049] According to some embodiments of this utility model, the battery module 2 includes a plurality of battery cells 21 arranged at intervals along the vertical direction and the second direction e2, and a coolant flow channel 22 is formed between any two adjacent battery cells 21. Therefore, when the coolant enters the immersion cooling chamber 11, it can flow through the coolant flow channel 22 in the gaps between the plurality of battery cells 21. When the coolant enters the coolant flow channel 22, it can fully contact the outer peripheral surface of the battery cell 21 for heat exchange, which can better increase the contact area between the coolant and the battery cell 21 to improve the heat exchange efficiency, thereby improving the cooling effect of the coolant on the battery module 2.

[0050] In some embodiments, the number of battery cells 21 through which the coolant flows from the coolant inlet 12 to the coolant outlet 13 does not exceed 10. It is understood that the more battery cells 21 the coolant flows through, the worse the cooling capacity becomes when the coolant reaches the cells 21 near the coolant outlet 13. Therefore, by controlling the number of battery cells 21 through which the coolant flows to no more than 10, the problem of a large difference in cooling effect between the cells 21 near the coolant inlet 12 and the cells 21 near the coolant outlet 13 can be avoided, thus ensuring uniform cooling of the battery cell module 2. The number of battery cells 21 through which the coolant flows can be 5, 6, 7, 8, 9, 10, etc., and no specific limitation is made here.

[0051] According to some embodiments of this utility model, the multiple cells 21 of each cell module 2 constitute multiple groups of cells arranged at intervals in the second direction e2. Each group of cells includes multiple cells 21 arranged at intervals in the vertical direction. The coolant flow channel 22 formed between two adjacent cells 21 in the second direction e2 is the first flow channel 22a, and the coolant flow channel 22 formed between two adjacent cells 21 in the vertical direction is the second flow channel 22b. The width of the second flow channel 22b is greater than the width of the first flow channel 22a. The cells 21 are placed horizontally and are cylindrical. The central axis of the cells 21 extends along the first direction e1. The width of the first flow channel 22a refers to the radial distance between the outer peripheral surfaces of two adjacent cells 21 in the second direction e2, and the width of the second flow channel 22b refers to the radial distance between the outer peripheral surfaces of two adjacent cells 21 in the vertical direction.

[0052] It is understandable that the width of the second flow channel 22b is greater than the width of the first flow channel 22a, so that the second flow channel 22b has a larger flow area than the first flow channel 22a. That is, the flow rate of coolant flowing along the second flow channel 22b is larger, thereby ensuring that the coolant flow rate at the multiple cells 21 arranged along the second direction e2 can be more evenly distributed, so as to avoid the occurrence of coolant flow dead zones that affect the local cooling effect of the cell module 2.

[0053] In a specific example, the cell module 2 further includes a mounting bracket 23, an insulating cover plate 24, and a busbar 25. The mounting bracket 23 has two pieces arranged along the first direction e1, and mounting grooves 231 are formed on the opposite sides of the two mounting brackets 23. The two ends of the cell 21 are respectively installed in the corresponding two mounting grooves 231 and glued to the mounting bracket 23. The two mounting brackets 23 define the liquid inlet channel and the liquid outlet channel on both sides of the second direction e2 to ensure that the coolant can enter between the two mounting brackets 23 and contact the cell 21. The insulating cover plate 24 has two pieces located on the side of the two mounting brackets 23 away from the cell 21, and the two insulating cover plates 24 are spaced apart. The positive and negative poles of multiple cells 21 in the same group of cells are oriented in the same direction, and the positive and negative poles of cells 21 in two adjacent groups of cells are oriented in opposite directions. The positive and negative poles of two adjacent groups of cells are connected in series through the busbar 25, and the positive and negative poles of multiple cells 21 in the same group of cells are connected in parallel through the same busbar 25. The module housing 1 is also equipped with a high-voltage output connector 3 and an information acquisition connector 4. The high-voltage output connector 3 is electrically connected to multiple battery cell modules 2 to output electrical energy to the outside. The information acquisition connector 4 is used to output parameters such as the temperature of the battery cell modules 2 that have been collected.

[0054] According to some embodiments of this utility model, the ratio of the width of the first flow channel 22a to the diameter of the cell 21 ranges from 0.02 to 0.1. It can be understood that, based on a fixed battery diameter, a larger ratio of the width of the first flow channel 22a to the diameter of the cell 21 results in a wider first flow channel 22a, a larger flow area, and lower resistance to coolant flow along the first flow channel 22a. However, this also occupies more space for cell 21 installation, and the fewer cells 21 can be arranged. Conversely, a smaller ratio of the width of the first flow channel 22a to the diameter of the cell 21 results in a narrower first flow channel 22a, a smaller flow area, and higher resistance to coolant flow along the first flow channel 22a. However, this also occupies less space for cell 21 installation, and the more cells 21 can be arranged.

[0055] Therefore, by controlling the ratio of the width of the first flow channel 22a to the diameter of the battery cell 21 within the range of 0.02 to 0.1, it is possible to avoid the first flow channel 22a being too wide and occupying too much space, thus affecting the number of battery cells 21 that can be arranged. At the same time, it is possible to avoid the first flow channel 22a being too narrow and increasing the flow resistance. This ensures that the coolant can flow smoothly along the first flow channel 22a while reserving more installation space for the battery cells 21. The ratio of the width of the first flow channel 22a to the diameter of the battery cell 21 can be 0.02, 0.03, 0.04, 0.05, 0.06, 0.07, 0.08, 0.09, 0.1, etc., and no specific limitation is made here.

[0056] According to some embodiments of this utility model, the ratio of the width of the second flow channel 22b to the diameter of the cell 21 ranges from 0.02 to 0.2. It can be understood that, based on a fixed battery diameter, a larger ratio of the width of the second flow channel 22b to the diameter of the cell 21 results in a wider second flow channel 22b, a larger flow area, and lower resistance to coolant flow along the second flow channel 22b. However, this also occupies more space for cell 21 installation, and the fewer cells 21 can be arranged. Conversely, a smaller ratio of the width of the second flow channel 22b to the diameter of the cell 21 results in a narrower second flow channel 22b, a smaller flow area, and higher resistance to coolant flow along the second flow channel 22b. However, this also occupies less space for cell 21 installation, and the more cells 21 can be arranged.

[0057] Therefore, by controlling the ratio of the width of the second flow channel 22b to the diameter of the battery cell 21 within the range of 0.02 to 0.2, it is possible to avoid the second flow channel 22b being too wide and occupying too much space, affecting the number of battery cells 21. At the same time, it is possible to avoid the second flow channel 22b being too narrow and increasing the flow resistance. This ensures that the coolant can flow smoothly along the second flow channel 22b while reserving more installation space for the battery cells 21. The ratio of the width of the second flow channel 22b to the diameter of the battery cell 21 can be 0.02, 0.03, 0.05, 0.07, 0.1, 0.12, 0.15, 0.17, 0.2, etc., and no specific limitation is made here.

[0058] According to some embodiments of this utility model, the width of the coolant flow channel 22 ranges from 0.5 to 4 mm. A wider coolant flow channel 22 results in a larger flow area and lower resistance to coolant flow, but also occupies more space for battery cell 21 installation, allowing for a smaller number of battery cells 21 to be arranged. Conversely, a narrower coolant flow channel 22 results in a smaller flow area and higher resistance to coolant flow, but occupies less space for battery cell 21 installation, allowing for a larger number of battery cells 21 to be arranged.

[0059] Therefore, by controlling the width of the coolant flow channel 22 within the range of 0.5mm to 4mm, it is possible to avoid the coolant flow channel 22 being too wide and occupying too much space, affecting the number of battery cells 21. At the same time, it is possible to avoid the coolant flow channel 22 being too narrow and increasing the flow resistance. This ensures that the coolant can flow smoothly along the coolant flow channel 22 while reserving more installation space for the battery cells 21. The width of the coolant flow channel 22 can be 0.5mm, 0.7mm, 1mm, 1.2mm, 1.5mm, 1.8mm, 2.4mm, 2.8mm, 3.2mm, 3.5mm, 4mm, etc., and no specific limitation is made here.

[0060] In some embodiments, the length of the battery cell 21 in the first direction e1 does not exceed 100 mm. Therefore, by limiting the length of the battery cell 21 in the first direction e1, it is possible to avoid the immersion cooling cavity 11 being too large in the first direction e1, which would affect the uniformity of the coolant flow in different areas within the immersion cooling cavity 11, thus ensuring that the coolant in each immersion cooling cavity 11 can uniformly cool the battery cell module 2. The length of the battery cell 21 in the first direction e1 can be 50 mm, 60 mm, 70 mm, 80 mm, 90 mm, 100 mm, etc., and no specific limitation is made here.

[0061] According to some embodiments of the present invention, the module housing 1 includes a top cover 14, a box body 15, and a partition 16. An upwardly open mounting cavity is formed inside the box body 15. The partition 16 has a plurality of partitions arranged at intervals along the first direction e1 inside the box body 15. The plurality of partitions 16 are used to divide the mounting cavity into a plurality of immersion cooling cavities 11. The top cover 14 is disposed at the upper end of the box body 15 and is used to block the opening of the immersion cooling cavity 11. In other words, the partition 16 can effectively separate two adjacent immersion cooling chambers 11, so that the immersion cooling chambers 11 form independent coolant flow spaces. During the process of installing the battery cell module 2 into the module housing 1, multiple battery cell modules 2 are placed into multiple immersion cooling chambers 11 respectively, and then the upper cover 14 is placed on the upper opening of the housing 15. Through the sealing treatment between the upper cover 14 and the housing 15 and the partition 16, such as setting a sealing element at the contact position between the upper cover 14 and the housing 15 and the partition 16, it can be ensured that the multiple immersion cooling chambers 11 can be completely separated.

[0062] According to some embodiments of this utility model, the weight ratio of the coolant in the immersion cooling chamber 11 to the weight of the battery cell module 2 does not exceed 1.5. This avoids excessive weight of the battery module 100 due to excessive coolant weight in the immersion cooling chamber 11, thus better controlling the weight of the battery module 100 and improving its lightweight design. The weight ratio of the coolant in the immersion cooling chamber 11 to the weight of the battery cell module 2 can be 0.9, 1, 1.1, 1.2, 1.3, 1.4, 1.5, etc., and no specific limitation is made here.

[0063] The battery pack 1000 according to a second aspect embodiment of the present invention is described below with reference to the accompanying drawings.

[0064] According to a second aspect of the present invention, a battery pack 1000 includes a battery module 100.

[0065] According to the battery pack 1000 of the second aspect of the present invention, coolant can be simultaneously delivered to multiple immersion cooling chambers 11 through multiple coolant inlets 12, which can realize the synchronous cooling of multiple cell modules 2 to ensure uniform cooling of multiple cell modules 2. At the same time, the flow path of coolant in each immersion cooling chamber 11 is shorter, and fewer cell modules 21 need to be cooled by coolant entering each immersion cooling chamber 11, thereby improving the cooling effect of coolant on cell modules 2 and improving the safety of battery module 100.

[0066] In some embodiments, the battery pack 1000 further includes an inlet pipe 200, an outlet pipe 300, a battery housing 400, and a battery management system 500. Multiple coolant inlets 12 are connected to the inlet pipe 200, and multiple coolant outlets 13 are connected to the outlet pipe 300. That is, multiple coolant inlets 12 share the same inlet pipe 200, and multiple coolant outlets 13 share the same outlet pipe 300, thus saving the number of inlet pipes 200 and outlet pipes 300. Furthermore, the battery housing 400 includes an upper housing 410 and a lower housing 420. The battery module 100 is mounted on the lower housing 420 and located within the space enclosed by the upper housing 410 and the lower housing 420. The battery management system 500 is disposed on the side of the module housing 1 in the second direction e2.

[0067] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0068] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0069] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and purpose of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A battery module, characterized in that, include: The module housing has a plurality of immersion cooling chambers arranged along a first direction, each of the immersion cooling chambers having a coolant inlet and a coolant outlet formed on the module housing; A battery cell module, wherein the battery cell module has a plurality of corresponding immersion cooling chambers, and the battery cell module is placed in the corresponding immersion cooling chamber.

2. The battery module according to claim 1, characterized in that, The coolant inlet is located at the bottom of the immersion cooling chamber, and the coolant outlet is located at the top of the immersion cooling chamber.

3. The battery module according to claim 2, characterized in that, The coolant inlet and the coolant outlet are located on opposite sides of the module housing in a second direction.

4. The battery module according to claim 2, characterized in that, The ratio of the distance between the coolant inlet and the lower end of the module housing to the height of the module housing is no more than 0.4; and / or, the cell module includes multiple cells, and the coolant outlet is higher than the uppermost cell in the cell module.

5. The battery module according to claim 2, characterized in that, The battery cell module includes multiple battery cells arranged at intervals along the vertical direction and the second direction, and a coolant flow channel is formed between any two adjacent battery cells.

6. The battery module according to claim 5, characterized in that, The multiple cells of each cell module constitute multiple groups of cells arranged at intervals in the second direction. Each group of cells includes multiple cells arranged at intervals in the vertical direction. The coolant flow channel formed between two adjacent cells in the second direction is the first flow channel, and the coolant flow channel formed between two adjacent cells in the vertical direction is the second flow channel. The width of the second flow channel is greater than the width of the first flow channel.

7. The battery module according to claim 6, characterized in that, The ratio of the width of the first flow channel to the diameter of the battery cell is in the range of 0.02 to 0.1; and / or, the ratio of the width of the first flow channel to the diameter of the battery cell is in the range of 0.02 to 0.

2.

8. The battery module according to claim 5, characterized in that, The width of the coolant flow channel ranges from 0.5 to 4 mm.

9. The battery module according to claim 1, characterized in that, The module housing includes a top cover, a box body, and partitions. An upwardly open mounting cavity is formed inside the box body. The partitions have a plurality of partitions spaced apart inside the box body along the first direction. The plurality of partitions are used to divide the mounting cavity into a plurality of immersion cooling cavities. The top cover is located at the upper end of the box body and is used to block the openings of the immersion cooling cavities. And / or, the weight ratio of the coolant in the immersion cooling cavity to the weight of the battery cell module does not exceed 1.

5.

10. A battery pack, characterized in that, include: The battery module according to any one of claims 1-9.

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