Liquid cooling structure for battery pack and battery pack

Abstract

The utility model provides a liquid cooling structure for a battery pack and the battery pack, the liquid cooling structure comprises a plurality of liquid cooling plates arranged at intervals, the two liquid cooling plates are in contact with the two side surfaces of a battery cell respectively, and when heat dissipated by the battery cell located in an accommodating space is transferred to the two liquid cooling plates in contact with the side surfaces of the battery cell, the liquid cooling plates are separated from the battery cell. The cooling liquid flowing in the liquid cooling flow channel can quickly take away heat so as to quickly cool the battery cell, and the liquid cooling plate simultaneously cools the two side surfaces of the battery cell so as to uniformly cool the battery cell in the height direction, so that the cooling performance is improved, and the condition that the cycle life is influenced due to temperature difference generated in the height direction of the battery cell is avoided; meanwhile, cooling can be achieved only through one liquid inlet end and one liquid outlet end in the whole liquid cooling structure, the manufacturing cost of the whole liquid cooling structure is greatly reduced, the number of the liquid inlet ends and the number of the liquid outlet ends are small, the leakage risk of the whole cooling structure can be reduced, and the safety of the cooling structure is improved.

Description

Technical Field

[0001] The present application relates to the technical field of energy storage, and particularly to a liquid cooling structure for a battery pack and a battery pack. Background Art

[0002] During the charging and discharging process of a battery, heat is generated. If this heat cannot be effectively dissipated, it will cause the battery temperature to rise, thereby affecting the performance and lifespan of the battery. Therefore, it is necessary to cool the battery so that the battery is at a better operating temperature, thereby improving its operating efficiency and extending the lifespan of the battery.

[0003] Currently, bottom cooling is mostly used for battery cooling. However, bottom cooling has many drawbacks. For example, there is a large temperature difference in the height direction of the battery, which affects the cycle life, or the overall flow resistance of the liquid cooling plate is relatively large and the cooling efficiency is poor. Utility Model Content

[0004] In view of this, the purpose of the present application is to provide a liquid cooling structure for a battery pack and a battery pack to solve or partially solve the problems raised in the background art.

[0005] Based on the above purpose, the first aspect of the present application provides a liquid cooling structure for a battery pack, including: at least one liquid cooling component, the liquid cooling component includes a plurality of liquid cooling plates and a plurality of transition liquid cooling plates arranged at intervals in the first direction, an accommodation space is provided between adjacent two of the liquid cooling plates, the accommodation space is used to accommodate at least one battery cell in the battery pack, the liquid cooling plate is used to contact the side surface of the battery cell, the plurality of liquid cooling plates include a first liquid cooling plate, at least one intermediate liquid cooling plate and a second liquid cooling plate that are sequentially connected end to end through the transition liquid cooling plates, a liquid inlet end is provided on the first liquid cooling plate, and a liquid outlet end is provided on the second liquid cooling plate.

[0006] Optionally, the liquid cooling plate extends in the second direction, the transition liquid cooling plate extends in the first direction, and the second direction is perpendicular to the first direction.

[0007] Optionally, a plurality of the liquid cooling components are provided, the plurality of liquid cooling components are arranged at intervals in the first direction, and an accommodation interval for accommodating at least one battery cell in the battery pack is provided between adjacent two of the liquid cooling components.

[0008] Optionally, the liquid cooling structure further includes a liquid inlet pipeline and a liquid outlet pipeline, the liquid inlet pipeline and the liquid outlet pipeline are respectively located on both sides of the liquid cooling component, the liquid inlet end of each liquid cooling component is communicated with the liquid inlet pipeline, and the liquid outlet end of each liquid cooling component is communicated with the liquid outlet pipeline.

[0009] Optionally, the liquid inlet pipe includes a liquid inlet, the liquid outlet pipe includes a liquid outlet, both the liquid inlet pipe and the liquid outlet pipe extend along the first direction, and the liquid inlet and the liquid outlet are located on the same side of the first liquid cooling plate or the second liquid cooling plate.

[0010] Optionally, each liquid cooling component further includes a liquid inlet current collector and a liquid outlet current collector. Each liquid inlet current collector is communicated with the corresponding liquid inlet end and the liquid inlet pipe, and each liquid outlet current collector is communicated with the corresponding liquid outlet end and the liquid outlet pipe.

[0011] Optionally, there is one liquid cooling component, there are multiple intermediate liquid cooling plates, and the liquid inlet end and the liquid outlet end are located on the same side of the liquid cooling component.

[0012] Optionally, the liquid cooling component further includes a liquid inlet pipe and a liquid outlet pipe. The liquid inlet pipe is communicated with the liquid inlet end, the liquid outlet pipe is communicated with the liquid outlet end. The liquid inlet pipe includes a liquid inlet, the liquid outlet pipe includes a liquid outlet. The liquid inlet pipe or the liquid outlet pipe extends along the first direction, and the liquid inlet and the liquid outlet are located on the same side of the first liquid cooling plate or the second liquid cooling plate.

[0013] In a second aspect of the present application, a battery pack is provided, including the liquid cooling structure according to any one of the first aspects above.

[0014] Optionally, it further includes a lower box body and a battery cell stack. The battery cell stack includes a plurality of sub-stacks stacked along the second direction. Each sub-stack includes a plurality of battery cells stacked along the first direction. The first direction and the second direction are perpendicular. The liquid cooling structure is located in the lower box body. Each accommodation space of the liquid cooling structure accommodates the sub-stack, and the liquid cooling plate of the liquid cooling structure contacts the side surface of the battery cell.

[0015] From the above, it can be seen that the liquid cooling structure and battery pack for a battery pack provided by the present application, the liquid cooling structure includes a plurality of liquid cooling plates arranged at intervals, each of the liquid cooling plates is provided with a liquid cooling channel, and there is a accommodating space between each two adjacent liquid cooling plates, the accommodating space is used to accommodate at least one battery cell, and the liquid cooling plate is used to contact the side of the battery cell, so that the two liquid cooling plates are respectively in contact with the two side surfaces of the battery cell, when the heat emitted by the battery cell in the accommodating space is transferred to the two liquid cooling plates in contact with the side surfaces thereof, the cooling liquid flowing in the liquid cooling channel can quickly take away the heat, so as to achieve rapid cooling of the battery cell, and the liquid cooling plate The two sides of the battery cell are cooled simultaneously to evenly cool the battery cell in the height direction, which not only improves the cooling performance but also avoids temperature differences in the height direction of the battery cell that affect the cycle life; at the same time, the multiple liquid cooling plates include a first liquid cooling plate, at least one intermediate liquid cooling plate and a second liquid cooling plate that are sequentially connected end to end, the first liquid cooling plate is provided with a liquid inlet end, and the second liquid cooling plate is provided with a liquid outlet end, so that only one liquid inlet end and one liquid outlet end are required in the entire liquid cooling structure to achieve cooling, which greatly reduces the production cost of the entire liquid cooling structure, and the small number of liquid inlet ends and liquid outlet ends can reduce the leakage risk of the entire cooling structure and improve its safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 A first structural schematic diagram of a liquid cooling structure for a battery pack is shown;

[0018] Figure 2 A second structural schematic diagram of a liquid cooling structure for a battery pack is shown;

[0019] Figure 3 A schematic diagram of the explosion structure when the liquid cooling structure is assembled in a battery module is shown;

[0020] Figure 4 A schematic diagram showing the structure of the liquid cooling structure when it is assembled in a battery module;

[0021] Figure 5 A schematic diagram showing a first cooling principle of a liquid cooling structure is shown;

[0022] Figure 6 A third structural schematic diagram of a liquid cooling structure is shown;

[0023] Figure 7Shows a top view of the third structure of the liquid cooling structure;

[0024] Figure 8 Shows a schematic diagram of the cooling principle of the third structure of the liquid cooling structure;

[0025] Figure 9 Shows the appendix of the specification Figure 6 A partial enlarged schematic diagram of D therein;

[0026] Figure 10 Shows the appendix of the specification Figure 6 A partial enlarged schematic diagram of D therein

[0027] Figure 11 Shows a top view of the second structure of the liquid cooling structure;

[0028] Figure 12 Shows a schematic diagram of the cooling principle of the second structure of the liquid cooling structure;

[0029] Figure 13 Shows the appendix of the specification Figure 2 A partial enlarged schematic diagram of A therein;

[0030] Figure 14 Shows the appendix of the specification Figure 2 A partial enlarged schematic diagram of B therein;

[0031] Figure 15 Shows an exploded structural schematic diagram of a battery pack assembled with a second liquid cooling structure and an electrical component;

[0032] Figure 16 Shows an exploded structural schematic diagram of a battery pack assembled with a third liquid cooling structure and an electrical component.

[0033] In the figure: 10, liquid cooling structure; 100, liquid cooling assembly; 110, liquid cooling plate; 111, second liquid cooling plate; 1111, liquid outlet end; 112, intermediate liquid cooling plate; 113, first liquid cooling plate; 1131, liquid inlet end; 114, accommodation space; 115, transition liquid cooling plate; 116, liquid inlet pipe; 1161, liquid inlet port; 117, liquid outlet pipe; 1171, liquid outlet port; 118, liquid inlet current collector; 119, liquid outlet current collector; 120, accommodation interval;

[0034] 20, battery cell stack; 210, sub-stack; 211, battery cell; 30, lower box body. Detailed implementation manners

[0035] To make the objectives, technical solutions, and advantages of the present application clearer and more understandable, the present application will be further described in detail below with reference to specific embodiments and the accompanying drawings.

[0036] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the embodiments of this application should have the ordinary meanings understood by those of ordinary skill in the field to which this application belongs. The "first", "second" and similar terms used in this application do not denote any order, quantity or importance, but are only used to distinguish different components. Words such as "including" or "comprising" mean that the elements or objects appearing before this word cover the elements or objects listed after this word and their equivalents, without excluding other elements or objects. Words such as "connected" or "coupled" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right", etc. are only used to represent relative positional relationships, and when the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0037] A battery pack generally includes a plurality of batteries stacked in sequence. Existing cooling methods for battery packs mostly use bottom cooling. However, bottom cooling has many drawbacks, resulting in poor cooling performance.

[0038] For example, for a battery pack with a relatively high height, the bottom cooling method will cause a large temperature difference in the height direction of the battery pack, affecting the cycle life; for a battery pack with a relatively long length, the temperature consistency of the batteries at the head and tail of the module is poor, and the overall flow resistance of the liquid cooling plate is relatively large; for a fast-charging battery pack, only bottom cooling cannot meet its high-rate heat dissipation requirements.

[0039] In addition, there are too many inlet pipes, outlet pipes and inlet / outlet connectors in the existing battery pack, resulting in a relatively high cost for preparing the cooling structure, and a high leakage risk due to the large number of connectors.

[0040] Therefore, there is an urgent need to provide a new cooling structure suitable for battery packs to improve its cooling effect on battery packs and with a relatively low cost.

[0041] Based on this, the present application provides a cooling structure for a battery pack.

[0042] Figure 1 FIG. 19 shows a first schematic structural diagram of a liquid cooling structure 10 for a battery pack; Figure 2 FIG. 21 shows a second schematic structural diagram of a liquid cooling structure 10 for a battery pack; Figure 3 FIG. 23 shows an exploded schematic structural diagram of the liquid cooling structure 10 when assembled on a battery module; Figure 4 FIG. 25 shows a schematic structural diagram of the liquid cooling structure 10 when assembled on a battery module.

[0043] See Figure 1 、 Figure 2 、 Figure 3 and Figure 4As shown, the liquid cooling structure 10 for a battery pack includes at least one liquid cooling assembly 100, and the liquid cooling assembly 100 includes a plurality of liquid cooling plates 110 and a plurality of transition liquid cooling plates 115 spaced apart along a first direction, and a receiving space 114 is provided between each adjacent two liquid cooling plates 110, and the receiving space 114 is used to receive at least one battery cell 211 in the battery pack, and the liquid cooling plate 110 is used to contact the side of the battery cell 211, and the plurality of liquid cooling plates 110 include a first liquid cooling plate 113, at least one intermediate liquid cooling plate 112, and a second liquid cooling plate 111, which are sequentially connected end to end through the transition liquid cooling plate 115, and a liquid inlet end 1131 is provided on the first liquid cooling plate 113, and a liquid outlet end 1111 is provided on the second liquid cooling plate 111.

[0044] Specifically, the liquid cooling structure 10 may include only one liquid cooling component 100 , or may include a plurality of liquid cooling components 100 . The specific number of the liquid cooling components 100 is not limited herein and is selected based on actual needs.

[0045] The liquid cooling assembly 100 includes a first direction (i.e. Figure 1 A plurality of liquid cooling plates 110 are arranged at intervals in the direction (indicated by the M in FIG. 1 ), and the number of the liquid cooling plates 110 is three or more. The specific number of the liquid cooling plates 110 is not limited and is arranged according to actual needs.

[0046] The accommodation space 114 is used to accommodate at least one battery cell 211. For example, the accommodation space 114 may accommodate only one battery cell 211, or may accommodate two or more battery cells 211 at the same time. When the accommodation space 114 accommodates two or more battery cells 211, the two or more battery cells 211 are stacked in sequence.

[0047] Liquid cooling channels (not shown in the figure) are provided in the liquid cooling plates 110, and the liquid cooling channels are used for the flow of cooling liquid. In this way, when the heat emitted by the battery cell 211 located in the accommodating space 114 is transferred to the two liquid cooling plates 110 in contact with the sides thereof, the cooling liquid flowing in the liquid cooling channels can quickly take away the heat to achieve rapid cooling of the battery cell 211. In addition, the liquid cooling plate 110 cools the two sides of the battery cell 211 at the same time to uniformly cool the battery cell 211 in the height direction, which not only improves the cooling performance, but also avoids temperature differences in the height direction of the battery cell 211 that affect the cycle life.

[0048] The plurality of liquid cooling plates 110 include a first liquid cooling plate 113 , at least one intermediate liquid cooling plate 112 , and a second liquid cooling plate 111 which are sequentially connected end to end via a transition liquid cooling plate 115 .

[0049] The number of the intermediate liquid cooling plates 112 may be one, two, or more than two. Figure 1As shown, the number of intermediate liquid cooling plates 112 is two. At this time, the entire liquid cooling structure 10 can form three accommodation spaces 114. As Figure 2 shown, the number of intermediate liquid cooling plates 112 is twenty-two. At this time, the entire liquid cooling structure 10 can form twenty-three accommodation spaces 114. Obviously, the more the number of intermediate liquid cooling plates 112 is, the more accommodation spaces 114 the entire liquid cooling structure 10 can form, and the more the number of battery cells 211 that the liquid cooling structure 10 can cool simultaneously.

[0050] The transition liquid cooling plate 115 is used to connect two adjacent liquid cooling plates 110, making the connection between two adjacent liquid cooling plates 110 more firm. Further, multiple liquid cooling plates 110 and multiple transition liquid cooling plates 115 can be an integrally formed structure, so as to further improve the structural stability of the entire liquid cooling structure 10 and greatly reduce its leakage risk.

[0051] The first liquid cooling plate 113, at least one intermediate liquid cooling plate 112 and the second liquid cooling plate 111 are connected end to end in sequence. In this way, multiple liquid cooling plates 110 can form a structure similar to an "S shape". Such a structure, on the one hand, enables there to be an accommodation space 114 between two liquid cooling plates 110, and two adjacent liquid cooling plates 110 can be in contact with two sides of the battery cell 211 located in the accommodation space 114 at the same time. When the battery cell 211 dissipates heat, its heat can be transferred from two sides to the two liquid cooling plates 110 respectively, and the two liquid cooling plates 110 can cool two sides of the battery cell 211 at the same time to uniformly cool the height direction of the battery cell 211, which not only improves the cooling performance but also avoids generating a temperature difference in the height direction of the battery cell 211 so as not to affect the cycle life.

[0052] Figure 5 Fig. shows the first cooling principle schematic diagram of the liquid cooling structure 10.

[0053] As Figure 5 shown, multiple liquid cooling plates 110 form a structure similar to an "S shape". In this way, the liquid flow channels in multiple liquid cooling plates 110 are sequentially connected, and multiple liquid cooling plates 110 can share one liquid inlet end 1131 and one liquid outlet end 1111. The cooling liquid enters from one liquid inlet end 1131, sequentially flows through the liquid flow channels in multiple liquid cooling plates 110, and finally flows out from the liquid outlet end 1111.

[0054] In this way, in the present application, only one liquid inlet end 1131 and one liquid outlet end 1111 are required in the entire liquid cooling structure 10 to achieve cooling, greatly reducing the number of liquid inlet ends 1131 and liquid outlet ends 1111, thereby reducing the manufacturing cost of the entire liquid cooling structure 10, and the small number of liquid inlet ends 1131 and liquid outlet ends 1111 can reduce the leakage risk of the entire liquid cooling structure 10 and improve its safety.

[0055] In some embodiments, with continued reference to Figure 1 as shown, the liquid cooling plate 110 extends along the second direction (i.e., Figure 1 the direction shown by L therein), and the transition liquid cooling plate 115 extends along the first direction (i.e., Figure 1 the direction shown by M therein), and the first direction and the second direction are perpendicular.

[0056] Specifically, the extending direction of the liquid cooling plate 110 and the extending direction of the transition liquid cooling plate 115 are perpendicular, so that the accommodation space 114 formed between two adjacent liquid cooling plates 110 and transition liquid cooling plates 115 is a regular cuboid space, which is convenient for accommodating the battery cells 211 with regular structures. At the same time, it also makes the entire liquid cooling structure 10 a regular structure, which is convenient for subsequently assembling the liquid cooling structure 10 with the battery cells 211 to form a battery pack.

[0057] Figure 6 Fig. shows a third schematic structural view of the liquid cooling structure 10.

[0058] In some embodiments, as Figure 6 shown, a plurality of liquid cooling assemblies 100 are provided, and the plurality of liquid cooling assemblies 100 are arranged at intervals along the first direction, and an accommodation interval 120 for accommodating at least one battery cell 211 in the battery pack is provided between two adjacent liquid cooling assemblies 100.

[0059] In this way, on the one hand, based on the accommodation space 114 already existing in each liquid cooling assembly 100, the accommodation interval 120 can be additionally increased, and the accommodation interval 120 can also be used to accommodate at least one battery cell 211 in the battery pack, so that the number of battery cells 211 that the liquid cooling structure 10 can cool simultaneously is more, further improving the cooling efficiency.

[0060] On the other hand, each liquid cooling assembly 100 includes a liquid inlet end 1131 and a liquid outlet end 1111, and the plurality of liquid cooling assemblies 100 include a plurality of liquid inlet ends 1131 and a plurality of liquid outlet ends 1111. In this way, the liquid inlet efficiency and the liquid outlet efficiency of the entire liquid cooling structure 10 can be improved, so as to further improve the cooling efficiency.

[0061] Figure 7 Fig. shows a top view of the third structure of the liquid cooling structure 10, Figure 8 Fig. shows a schematic diagram of the cooling principle of the third structure of the liquid cooling structure 10.

[0062] In some embodiments, refer to Figure 7 and Figure 8As shown, the liquid cooling structure 10 further includes an inlet pipe 116 and an outlet pipe 117. The inlet pipe 116 and the outlet pipe 117 are respectively located on both sides of the liquid cooling assembly 100. The inlet end 1131 of each liquid cooling assembly 100 is communicated with the inlet pipe 116, and the outlet end 1111 of each liquid cooling assembly 100 is communicated with the outlet pipe 117.

[0063] Specifically, the inlet pipe 116 and the outlet pipe 117 are respectively located on both sides of the liquid cooling assembly 100. On the one hand, it can increase the distance from the inlet end 1131 to the outlet end 1111, thereby increasing the length of the path for the cooling liquid to flow in the liquid cooling plate 110 to improve the cooling effect. On the other hand, the inlet pipe 116 and the outlet pipe 117 are respectively located on both sides of the liquid cooling assembly 100, which can avoid interference between the inlet pipe 116 and the outlet pipe 117, improve the safety of the liquid cooling structure 10, and can also reduce the complexity of the manufacturing process.

[0064] The inlet end 1131 of each liquid cooling assembly 100 is communicated with the inlet pipe 116, and the outlet end 1111 of each liquid cooling assembly 100 is communicated with the outlet pipe 117. In this way, only one inlet pipe 116 and one outlet pipe 117 are needed to realize the inlet and outlet of all liquid cooling assemblies 100. On the premise of ensuring the cooling effect, the cost of manufacturing the pipes can be reduced, and at the same time, the leakage risk caused by too many pipes can be avoided.

[0065] In some embodiments, continue to refer to Figure 7 and Figure 8 As shown, the inlet pipe 116 includes an inlet 1161, the outlet pipe 117 includes an outlet 1171. The inlet pipe 116 and the outlet pipe 117 both extend along the first direction. The inlet 1161 and the outlet 1171 are located on the same side of the first liquid cooling plate 113 or the second liquid cooling plate 111. In this way, on the premise of ensuring the cooling effect and manufacturing cost, the inlet 1161 and the outlet 1171 being located on the same side can reduce the length of the entire liquid cooling structure 10 in the first direction, thereby reducing the volume occupied by the liquid cooling structure 10 when assembled into a battery pack, which is convenient for subsequent assembly processes. At the same time, the inlet 1161 and the outlet 1171 being located on the same side is also convenient for connecting the inlet 1161, the outlet 1171 to an external water source or a water collection device, and is also convenient for operation by an operator.

[0066] Figure 9 shows a partial enlarged schematic diagram of D in the attached drawings of the specification, Figure 6 and Figure 10 shows a partial enlarged schematic diagram of D in the attached drawings of the specification. Figure 6 and

[0067] In some embodiments, refer to Figure 6 and Figure 9and Figure 10 As shown, each liquid cooling component 100 further includes an inlet liquid collector 118 and an outlet liquid collector 119. Each inlet liquid collector 118 is communicated with the corresponding inlet end 1131 and the inlet pipeline 116, and each outlet liquid collector 119 is communicated with the corresponding outlet end 1111 and the outlet pipeline 117.

[0068] Specifically, the inlet liquid collector 118 is used to communicate the corresponding inlet end 1131 and the inlet pipeline 116, and the outlet liquid collector 119 is used to communicate the corresponding outlet end 1111 and the outlet pipeline 117. In this way, the inlet pipeline 116 and the outlet pipeline 117 only need to be connected to the inlet liquid collector 118 and the outlet liquid collector 119, and there is no need to be directly connected to the liquid cooling plate 110. On the one hand, there is no need to make special design for the liquid cooling plate 110 so that it can be connected to the pipeline, which simplifies the manufacturing process, and the liquid cooling plate 110 can also be continuously used in other liquid cooling structures 10. On the other hand, the liquid cooling plate 110 is not directly connected to the pipeline, but is connected to the pipeline through the inlet liquid collector 118 or the outlet liquid collector 119, which can improve the connection stability between the liquid cooling plate 110, the inlet liquid collector 118 and the inlet pipeline 116, and between the liquid cooling plate 110, the outlet liquid collector 119 and the outlet pipeline 117, and avoid the risk of leakage.

[0069] In some embodiments, continue to refer to Figure 1 and Figure 2 As shown, there is one liquid cooling component 100, and there are multiple intermediate liquid cooling plates 112. The inlet end 1131 and the outlet end 1111 are located on the same side of the liquid cooling component 100, which is convenient for the connection between the inlet end 1131, the outlet end 1111 and the external water source or water collection device, and is also convenient for the operator to operate.

[0070] Specifically, the number of the intermediate liquid cooling plates 112 is multiple. In this way, the multiple intermediate liquid cooling plates 112 are connected in series in turn to form multiple accommodating spaces 114, so that the entire liquid cooling structure 10 can cool multiple battery cells 211 simultaneously. Exemplarily, as Figure 2 shown, the number of the intermediate liquid cooling plates 112 is twenty-two. At this time, the entire liquid cooling structure 10 can form twenty-three accommodating spaces 114. Obviously, the more the number of the intermediate liquid cooling plates 112 is, the more the accommodating spaces 114 that the entire liquid cooling structure 10 can form are, and the more the number of the battery cells 211 that the liquid cooling structure 10 can cool simultaneously is.

[0071] Meanwhile, although there are multiple intermediate liquid cooling plates 112, the entire liquid cooling structure has only one liquid inlet end 1131 and one liquid outlet end 1111, greatly reducing the number of liquid inlet ends 1131 and liquid outlet ends 1111, thereby reducing the manufacturing cost of the entire liquid cooling structure 10. Moreover, the small number of liquid inlet ends 1131 and liquid outlet ends 1111 can reduce the leakage risk of the entire liquid cooling structure 10 and improve its safety.

[0072] Figure 11 Fig. 4 shows a top view of the second structure of the liquid cooling structure 10. Figure 12 Fig. 5 shows a schematic diagram of the cooling principle of the second structure of the liquid cooling structure 10.

[0073] In some embodiments, referring to Figure 11 and Figure 13 as shown, the liquid cooling assembly 100 further includes a liquid inlet pipeline 116 and a liquid outlet pipeline 117. The liquid inlet pipeline 116 is communicated with the liquid inlet end 1131, and the liquid outlet pipeline 117 is communicated with the liquid outlet end 1111. The liquid inlet pipeline 116 includes a liquid inlet 1161, and the liquid outlet pipeline 117 includes a liquid outlet 1171. The liquid inlet pipeline 116 or the liquid outlet pipeline 117 extends along the first direction, and the liquid inlet 1161 and the liquid outlet 1171 are located on the same side of the first liquid cooling plate 113 or the second liquid cooling plate 111.

[0074] Specifically, the liquid inlet pipeline 116 or the liquid outlet pipeline 117 extending along the first direction can make the liquid inlet 1161 and the liquid outlet 1171 located on the same side of the first liquid cooling plate 113 or the second liquid cooling plate 111. In this way, on the premise of ensuring the cooling effect, the liquid inlet 1161 and the liquid outlet 1171 being on the same side can reduce the length of the entire liquid cooling structure 10 in the first direction, and further reduce the volume occupied by the liquid cooling structure 10 when assembled into a battery pack, facilitating subsequent assembly processes.

[0075] Figure 13 Fig. 6 shows a partially enlarged schematic diagram of A in the accompanying drawings of the specification. Figure 2 Fig. 7 shows a partially enlarged schematic diagram of B in the accompanying drawings of the specification. Figure 14 Fig. 8 shows a partially enlarged schematic diagram of C in the accompanying drawings of the specification. Figure 2 Fig. 9 shows a partially enlarged schematic diagram of D in the accompanying drawings of the specification.

[0076] In some embodiments, referring to Figure 13 and Figure 14 as shown, the liquid cooling assembly 100 further includes a liquid inlet current collector 118 and a liquid outlet current collector 119. The liquid inlet current collector 118 is communicated with the liquid inlet pipeline 116 and the liquid inlet end 1131, and the liquid outlet current collector 119 is communicated with the liquid outlet pipeline 117 and the liquid outlet end 1111.

[0077] Specifically, the liquid inlet current collector 118 is used to connect the corresponding liquid inlet end 1131 and the liquid inlet pipe 116, and the liquid outlet current collector 119 is used to connect the corresponding liquid outlet end 1111 and the liquid outlet pipe 117. In this way, the liquid inlet pipe 116 and the liquid outlet pipe 117 only need to be connected to the liquid inlet current collector 118 and the liquid outlet current collector 119, and there is no need to be directly connected to the liquid cooling plate 110. On the one hand, there is no need to make special design for the liquid cooling plate 110 to enable it to be connected to the pipe, which simplifies the manufacturing process, and the liquid cooling plate 110 can also be continuously used in other liquid cooling structures 10. On the other hand, the liquid cooling plate 110 is not directly connected to the pipe, but is connected to the pipe through the liquid inlet current collector 118 or the liquid outlet current collector 119, which can improve the connection stability between the liquid cooling plate 110, the current collector and the pipe, and avoid the risk of leakage.

[0078] Figure 15 Fig. shows an exploded schematic view of a battery pack formed by assembling the second liquid cooling structure 10 with electricity; Figure 16 Fig. shows an exploded schematic view of a battery pack formed by assembling the third liquid cooling structure 10 with electricity.

[0079] See Figure 15 and Figure 16 , the present application also provides a battery pack, including the liquid cooling structure 10 of any of the above embodiments.

[0080] Specifically, the liquid cooling structure 10 further includes a lower box body 30 and a stack 20 of battery cells 211. The stack 20 of battery cells 211 includes a plurality of sub-stacks 210 stacked along the second direction (i.e., the direction shown by L in Figure 15 and Figure 16 ), and each sub-stack 210 includes a plurality of battery cells 211 stacked along the first direction (i.e., the direction shown by M in Figure 15 and Figure 16 ). The first direction and the second direction are perpendicular. The liquid cooling structure 10 is located in the lower box body 30, and each accommodation space 114 of the liquid cooling structure 10 accommodates a sub-stack 210. The liquid cooling plate 110 of the liquid cooling structure 10 is in contact with the side surface of the battery cell 211.

[0081] In the present application, the side surface refers to any one of the four side surfaces of the battery cell 211. That is, the liquid cooling plate 110 can be used to cool the two large surfaces (the large surfaces refer to the two side surfaces with relatively large areas among the four side surfaces of the battery cell 211) of the battery cell 211, or can be used to cool the small surfaces (the small surfaces refer to the two side surfaces with relatively small areas among the four side surfaces of the battery cell 211) of the battery cell 211.

[0082] The liquid cooling plate 110 is in contact with the side surface of the battery cell 211, so that the two liquid cooling plates 110 can cool the two side surfaces of the battery cell 211 simultaneously, and the cooling effect is better. In this way, the heat dissipation requirements for the high-rate fast charging of the battery module can be supported.

[0083] For a sub-stack 210, it is within the accommodation space 114 formed by two adjacent liquid cooling plates 110. Its two opposite side surfaces are respectively in contact with these two liquid cooling plates 110. In this way, the two liquid cooling plates 110 can simultaneously cool the two side surfaces of each battery cell 211 in the sub-stack 210. Thus, not only can the temperature uniformity of each battery cell 211 in the height direction be ensured, effectively reducing the temperature difference of the battery cells 211, but also the cooling effect between the head and tail battery cells 211 can be made uniform in the length direction of the entire battery module (i.e., Figure 15 the direction shown by M in the figure), improving the temperature consistency of each battery cell 211 in the entire battery module.

[0084] Those of ordinary skill in the art should understand that: The discussion of any of the above embodiments is only exemplary and is not intended to imply that the scope of the present application (including the claims) is limited to these examples; Under the concept of the present application, the technical features in the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations in different aspects of the present application as described above, which are not provided in detail for the sake of brevity.

[0085] The embodiments of the present application are intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present application shall be included within the protection scope of the present application.

Claims

1. A liquid cooling structure for a battery pack, characterized in that, Comprising: At least one liquid cooling component, the liquid cooling component includes a plurality of liquid cooling plates and a plurality of transition liquid cooling plates arranged at intervals in a first direction. An accommodation space is provided between adjacent two of the liquid cooling plates, and the accommodation space is used to accommodate at least one battery cell in the battery pack. The liquid cooling plate is used to contact the side surface of the battery cell. The plurality of liquid cooling plates include a first liquid cooling plate, at least one intermediate liquid cooling plate, and a second liquid cooling plate that are sequentially connected end to end through the transition liquid cooling plates. The first liquid cooling plate is provided with a liquid inlet end, and the second liquid cooling plate is provided with a liquid outlet end.

2. The liquid cooling structure according to claim 1, wherein, The liquid cooling plate extends in a second direction, the transition liquid cooling plate extends in the first direction, and the second direction is perpendicular to the first direction.

3. The liquid cooling structure according to claim 2, wherein, A plurality of the liquid cooling components are provided, and the plurality of liquid cooling components are arranged at intervals in the first direction. An accommodation interval for accommodating at least one battery cell in the battery pack is provided between adjacent two of the liquid cooling components.

4. The liquid cooling structure according to claim 3, wherein The liquid cooling structure further includes a liquid inlet pipeline and a liquid outlet pipeline. The liquid inlet pipeline and the liquid outlet pipeline are respectively located on two sides of the liquid cooling component. The liquid inlet end of each liquid cooling component is communicated with the liquid inlet pipeline, and the liquid outlet end of each liquid cooling component is communicated with the liquid outlet pipeline.

5. The liquid cooling structure according to claim 4, wherein The liquid inlet pipeline includes a liquid inlet, the liquid outlet pipeline includes a liquid outlet. The liquid inlet pipeline and the liquid outlet pipeline both extend in the first direction, and the liquid inlet and the liquid outlet are located on the same side of the first liquid cooling plate or the second liquid cooling plate.

6. The liquid cooling structure according to claim 4, wherein, Each of the liquid cooling components further includes a liquid inlet current collector and a liquid outlet current collector. Each liquid inlet current collector is communicated with the corresponding liquid inlet end and the liquid inlet pipeline, and each liquid outlet current collector is communicated with the corresponding liquid outlet end and the liquid outlet pipeline.

7. The liquid cooling structure according to claim 2, characterized in that One liquid cooling component is provided, a plurality of the intermediate liquid cooling plates are provided, and the liquid inlet end and the liquid outlet end are located on the same side of the liquid cooling component.

8. The liquid cooling structure according to claim 7, wherein The liquid cooling component further includes a liquid inlet pipeline and a liquid outlet pipeline. The liquid inlet pipeline is communicated with the liquid inlet end, the liquid outlet pipeline is communicated with the liquid outlet end. The liquid inlet pipeline includes a liquid inlet, the liquid outlet pipeline includes a liquid outlet. The liquid inlet pipeline or the liquid outlet pipeline extends along the first direction, and the liquid inlet and the liquid outlet are located on the same side of the first liquid cooling plate or the second liquid cooling plate.

9. A battery pack, characterized in that, Comprising the liquid cooling structure according to any one of claims 1 to 8.

10. The battery pack according to claim 9, wherein Further including a lower box body and a battery cell stack. The battery cell stack includes a plurality of sub-stacks stacked in a second direction. Each sub-stack includes a plurality of battery cells stacked in a first direction. The first direction and the second direction are perpendicular. The liquid cooling structure is located in the lower box body. Each accommodation space of the liquid cooling structure accommodates the sub-stack, and the liquid cooling plate of the liquid cooling structure contacts the side surface of the battery cell.

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