Battery pack

Abstract

The battery pack comprises a box body, a plurality of modules, a fan and a liquid cooling plate, the box body is provided with a containing cavity, an air inlet and an air outlet, the air inlet and the air outlet are formed in the two opposite ends of the box body and communicate with the containing cavity, the fan is connected with the box body and covers the air inlet and / or the air outlet, the modules are arranged in the containing cavity at intervals, and the liquid cooling plate is arranged in the containing cavity. The liquid cooling plates are arranged in the containing cavity in pairs and located between the adjacent modules, the air inlets and the air outlets are located between the paired liquid cooling plates, air channels are formed between the liquid cooling plates, the liquid cooling plates are used for being attached to the modules, and the technical problem of how to adjust the cooling effect according to parameters such as the battery running state and the environment temperature is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of battery heat dissipation, and in particular to a battery pack. Background Art

[0002] With the rapid development of electric vehicles, energy storage systems, and portable electronic devices, battery systems are being used more and more widely. However, batteries generate a lot of heat during operation, especially under conditions such as high-power discharge and fast charging. If the heat cannot be dissipated in a timely and effective manner, the battery temperature will rise rapidly, which may lead to performance degradation, capacity decay, and even serious safety issues such as thermal runaway. Therefore, optimizing the heat dissipation performance of the battery system is the key to improving its service life and operational safety.

[0003] At present, common battery cooling methods include air cooling, liquid cooling and phase change material cooling. However, existing battery systems usually use cooling devices with fixed structures, which makes it difficult to dynamically adjust the cooling effect according to actual working conditions. For example, when the battery load is light or the ambient temperature is low, a fixed cooling system may cause unnecessary energy consumption, while when the battery load increases or the ambient temperature rises, the fixed cooling capacity may not be able to meet the heat dissipation requirements, resulting in excessive battery temperature and affecting the normal operation of the system.

[0004] Therefore, how to adjust the cooling effect according to parameters such as battery operating status and ambient temperature has become a technical problem that needs to be solved urgently. Summary of the invention

[0005] An object of the present invention is to provide a battery pack, which aims to solve the technical problem of how to adjust the cooling effect according to parameters such as the battery operating state and ambient temperature.

[0006] To achieve the above-mentioned purpose, the present invention provides a solution: a battery pack, which includes a box body, a accommodating cavity, and an air inlet and an air outlet arranged at opposite ends of the box body and connected to the accommodating cavity, a fan connected to the box body, covering the air inlet and / or the air outlet, a plurality of modules arranged in the accommodating cavity at intervals, liquid cooling plates arranged in pairs in the accommodating cavity and located between adjacent modules, the air inlet and the air outlet are located between the paired liquid cooling plates, an air duct is formed between the liquid cooling plates, and the liquid cooling plates are used to fit with the modules.

[0007] Optionally, the liquid cooling plate includes a main board and a support plate connected to each other, the extension direction of the main board is a first direction, the extension direction of the support plate is a second direction, the first direction is from the air inlet to the air outlet, the second direction is perpendicular to the first direction, the main board is connected to one side of the module, and the support plate is inserted into the module.

[0008] Optionally, the module includes a plurality of battery cells, the plurality of battery cells are arranged along the thickness direction thereof, the thickness direction of the battery cells and the first direction are parallel to each other, and the support plate is disposed in the gap between adjacent battery cells and contacts the battery cells.

[0009] Optionally, the liquid cooling plate further includes a cover body, the liquid cooling plate is provided with a liquid inlet and a liquid outlet, and the cover body is used to cover and seal the liquid inlet and the liquid outlet.

[0010] Optionally, the box body is provided with a clearance opening, and the clearance opening is respectively provided at one end of the liquid cooling plate where the liquid inlet is provided and at the other end where the liquid outlet is provided.

[0011] Optionally, the liquid inlet is arranged on the liquid cooling plate close to the air outlet, and the liquid outlet is arranged on the liquid cooling plate close to the air inlet.

[0012] Optionally, the liquid inlet is arranged in a region of the liquid cooling plate close to the bottom of the box body, and the liquid outlet is arranged in a region of the liquid cooling plate close to the top of the box body.

[0013] Optionally, the liquid cooling plate is slidably connected to the box body, and the sliding direction is perpendicular to the direction from the air inlet to the air outlet, and the paired liquid cooling plates can be close to or away from each other.

[0014] Optionally, the box body is provided with through grooves at opposite ends of the air duct, and connecting blocks are provided at opposite ends of the liquid cooling plate. The connecting blocks pass through the through grooves and are slidably connected to the through grooves.

[0015] Optionally, the battery pack further includes a fixing member, which connects the liquid cooling plate and the box body and is used to fix the position of the liquid cooling plate.

[0016] Optionally, the liquid cooling plate further includes a plurality of protrusions, which are arranged on a side of the liquid cooling plate close to the air duct and are spaced apart from each other.

[0017] The beneficial effects of the present invention are:

[0018] Compared with the single heat dissipation mode in the prior art, the present application provides a variety of optional heat dissipation modes for the battery pack by combining a liquid cooling plate with an air cooling structure, and can dynamically adjust the heat dissipation mode according to the battery working state and ambient temperature. The first heat dissipation mode is that the liquid cooling plate is connected to the liquid cooling unit for forced liquid cooling, which is suitable for situations with high heat dissipation requirements. The second heat dissipation mode is to use an air cooling system to cool the liquid cooling plate, and the liquid cooling plate then dissipates the heat from the battery module, which is suitable for situations with low heat dissipation requirements. The third heat dissipation mode is to cool the liquid cooling plate by natural air flow, which saves energy and reduces noise. At the same time, compared with the combination of air cooling and liquid cooling in the prior art, the air cooling system in the present application only cools the liquid cooling plate, and does not directly act on the module. It avoids the difference in heat dissipation efficiency that may occur when air cooling and liquid cooling act on different areas, thereby avoiding the problem of temperature differences in the heat dissipation area that may be caused by uneven heat dissipation. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention 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 invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0020] Figure 1 is an overall schematic diagram of a battery pack provided by an embodiment of the present invention;

[0021] Figure 2 is a schematic structural diagram of a battery pack provided by an embodiment of the present invention;

[0022] Figure 3 is a top view of a battery pack provided by an embodiment of the present invention;

[0023] Figure 4 The embodiment of the present invention provides Figure 3 Sectional view in the AA direction;

[0024] Figure 5 is a schematic diagram of the internal structure of another battery pack provided by an embodiment of the present invention;

[0025] Figure 6 The embodiment of the present invention provides Figure 3 Cross-sectional view in the BB direction;

[0026] Figure 7 The embodiment of the present invention provides Figure 6 A partial enlarged view of the middle A area;

[0027] Figure 8 is a schematic diagram of a state of another battery pack provided by an embodiment of the present invention;

[0028] Fig. 9 is a schematic diagram of another state of a battery pack provided by an embodiment of the present invention;

[0029] Fig.10 It is a structural schematic diagram of a liquid cooling plate provided in an embodiment of the present invention.

[0030] Description of Figure Numbers:

[0031] 10. Box body; 11. Accommodating cavity; 12. Air inlet; 13. Air outlet; 14. Make way; 15. Through slot; 16. Air duct; 20. Module; 21. Battery cell; 30. Liquid cooling plate; 31. Main board; 32. Support plate; 33. Cover body; 34. Liquid inlet; 35. Liquid outlet; 36. Connecting block; 37. Protrusion; 40. Fixing piece; 50. Fan. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] See also Figure 1 and Figure 2 , Figure 1 is an overall schematic diagram of a battery pack provided by an embodiment of the present invention, Figure 2 It is a schematic diagram of the structure of a battery pack provided by an embodiment of the present invention.

[0034] The embodiment of the present invention provides a battery pack, which aims to effectively solve the problem of a single heat dissipation mode of the existing battery system. The battery pack includes a box 10, a plurality of modules 20, a fan 50 and a liquid cooling plate 30, wherein a receiving chamber 11 is provided inside the box 10 of the battery pack, and an air inlet 12 and an air outlet 13 are provided at both ends of the receiving chamber 11, and the air inlet 12 and the air outlet 13 are interconnected through the receiving chamber 11 to form an air circulation channel. The fan 50 is connected to the box 10 and covers the air inlet 12. A plurality of battery modules 20 are arranged in the receiving chamber 11 at intervals, and the liquid cooling plate 30 is arranged in pairs inside the receiving chamber 11, located between adjacent modules 20, and closely fits the modules 20. The function of the liquid cooling plate 30 is to take away the heat generated by the module 20 through liquid circulation, thereby preventing the battery from overheating and ensuring the safety and efficient operation of the battery.

[0035] See also Figure 3 and Figure 4 , Figure 3 is a top view of a battery pack provided by an embodiment of the present invention, Figure 4 The embodiment of the present invention provides Figure 3 Cross-sectional view along the AA direction. In this embodiment, the accommodating cavity 11 of the battery case 10 is divided into three areas by the liquid cooling plate 30. The two sides of the liquid cooling plate 30 are the module 20 placement areas, which are used to place the battery module 20; and the air duct 16 area is formed between the liquid cooling plates 30, and the air duct 16 provides a channel for air circulation. The module 20 is arranged close to the liquid cooling plate 30 to achieve more efficient heat conduction and heat dissipation. Through this special layout, the battery pack can flexibly adjust its heat dissipation mode to meet different heat dissipation requirements.

[0036] Specifically, the present embodiment provides a variety of heat dissipation modes. When the heat dissipation demand of the battery pack is low, the air cooling system cools the liquid cooling plate 30, and then the liquid cooling plate 30 dissipates heat for the battery module 20. The fan 50 is turned on, and air is introduced from the air inlet 12, and the heat is taken away through the surface of the liquid cooling plate 30. The air flows through the liquid cooling plate 30 and is discharged through the air outlet 13. The liquid cooling plate 30 conducts the heat in the module 20 to the coolant through close contact with the module 20, thereby achieving effective temperature control. In this mode, the cooling of the liquid cooling plate 30 is achieved by the air cooling system. Suitable for low load or normal working conditions.

[0037] When the heat dissipation demand of the battery pack increases, the battery pack is connected to the liquid cooling unit for forced liquid cooling. At this time, the fan 50 is not turned on, and the flowing coolant continues to dissipate heat for the battery module 20. When the heat dissipation demand of the battery pack increases further, the fan 50 is started while the battery pack is connected to the liquid cooling unit. The liquid cooling unit and the air cooling system cool the liquid cooling plate 30 at the same time, improving the heat exchange efficiency of the liquid cooling plate 30 itself, thereby greatly improving the overall heat dissipation capacity. Through this dual heat dissipation mode of air cooling and liquid cooling, the battery pack can maintain a low temperature under high load or extreme working conditions, preventing performance degradation or safety hazards caused by excessive temperature.

[0038] See also Figure 5 , Figure 5 3 is a schematic diagram of the internal structure of another battery pack provided by an embodiment of the present invention. In some embodiments, the liquid cooling plate 30 includes a main board 31 and a support plate 32, and the main board 31 and the support plate 32 are connected to each other and together form the liquid cooling plate 30. The main board 31 extends in a first direction, and the support plate 32 extends in a second direction, and the first direction is perpendicular to the second direction. Figure 5 The direction A is the first direction, and the direction B is the second direction.

[0039] Specifically, the first direction refers to the direction of air flow from the air inlet 12 to the air outlet 13 in the battery pack, that is, the main flow direction of the heat dissipation channel where the liquid cooling plate 30 is located. The main board 31 is connected to one side of the module 20, and is mainly responsible for the task of heat exchange with the surface of the module 20, effectively transferring the heat generated by the module 20 to the liquid cooling plate 30, and then taking away the heat through the coolant in the liquid cooling plate 30. The second direction is a direction perpendicular to the first direction. The support plate 32 extends along this direction and is interspersed between the battery modules 20, so that the liquid cooling plate 30 can be flexibly arranged between the modules 20 and ensure a good contact surface. The coolant can more fully contact the surface of the module 20, thereby enhancing the heat conduction effect.

[0040] In this embodiment, the main board 31 and the support plate 32 cooperate with each other and act together on the module 20. The connection between the main board 31 and the module 20 ensures the conduction of heat, so that the liquid cooling plate 30 can efficiently complete the heat dissipation task of the module 20. The support plate 32 increases the contact area between the liquid cooling plate 30 and the module 20 through the plug-in layout, further optimizing the efficiency of heat exchange. In addition, the setting of the support plate 32 also enhances the stability and support force of the liquid cooling plate 30, improves the stability and durability of the structure, and can maintain good heat dissipation performance, especially when the battery pack is in long-term operation and high-load working conditions.

[0041] Furthermore, the battery module 20 includes a plurality of battery cells 21, which are arranged in the accommodating cavity 11 along the thickness direction, and the thickness direction is parallel to the first direction (i.e., the air flow direction from the air inlet 12 to the air outlet 13). This arrangement enables the battery cells 21 to be arranged at a high density in a limited space, and provides favorable conditions for the arrangement of the heat dissipation structure.

[0042] In order to improve the heat dissipation effect, the support plate 32 of the liquid cooling plate 30 is arranged in the gap between adjacent battery cells 21 and directly contacts the side of the battery cell 21. The support plate 32 contacts the side of the battery cell 21 to increase the contact area with the battery cell 21. This helps to achieve efficient heat conduction, quickly transfer the heat generated by the battery cell 21 during operation to the liquid cooling plate 30, and discharge it in time through the circulation of the coolant, thereby effectively reducing the temperature of the battery cell 21.

[0043] In the present embodiment, the support plate 32 is inserted between adjacent battery cells 21, occupying the gap space that is usually ignored, which not only improves the heat exchange efficiency between the liquid cooling plate 30 and the battery cell 21, but also enhances the stability of the internal structure of the module 20. After the support plate 32 is inserted into the gap between the battery cells 21, it can play a supporting and fixing role to a certain extent, reduce the displacement of the battery cells 21 caused by vibration or thermal expansion during operation, and maintain the overall structural stability of the module 20. At the same time, through the close contact between the support plate 32 and the battery cell 21, the heat inside the battery pack can be transferred and dissipated in a more efficient manner. Under high-load working conditions, even if the battery cell 21 generates a lot of heat, the support plate 32 can quickly direct the heat to the liquid cooling plate 30, and cooperate with the air cooling system to further enhance the heat dissipation effect.

[0044] In some embodiments, see Figure 6 , Figure 6 The embodiment of the present invention provides Figure 3A cross-sectional view in the middle BB direction. The liquid cooling plate 30 is provided with a liquid inlet 34 and a liquid outlet 35, which are respectively located at the two ends of the liquid cooling plate 30, and are used to connect the coolant circulation system so that the coolant can circulate inside the liquid cooling plate 30, taking away the heat generated during the operation of the module 20, and ensuring that the battery module 20 maintains a low operating temperature when under high load or working for a long time. At the same time, the liquid cooling plate 30 also includes a cover 33, which is used to close the liquid inlet 34 and the liquid outlet 35 on the liquid cooling plate 30, so as to realize flexible cooling function configuration.

[0045] In this embodiment, the liquid cooling plate 30 can be connected to the external coolant circulation pipeline through the liquid inlet 34 and the liquid outlet 35 to form a complete liquid cooling circuit, thereby realizing the dynamic cooling function of the liquid cooling plate 30, so that the coolant can circulate during operation and quickly take away the heat generated by the module 20.

[0046] When the liquid inlet 34 and the liquid outlet 35 of the liquid cooling plate 30 are closed by the cover 33 and are not connected to the cooling liquid circulation system, the liquid cooling plate 30 can be used as a static cooling plate. In this state, the liquid cooling plate 30 is in close contact with the battery module 20 through its own high thermal conductivity material, and the heat generated by the module 20 is diffused to the entire surface of the liquid cooling plate 30 by heat conduction, thereby naturally dissipating the heat.

[0047] At the same time, when the liquid cooling plate 30 is used as a static cold plate, it can be operated in combination with an air cooling structure. When the fan is turned on, the air cooling system cools the liquid cooling plate 30 , and the liquid cooling plate 30 and the battery module 20 dissipate heat.

[0048] In some embodiments, to facilitate installation of the liquid cooling plate 30 and connection of pipelines, a clearance opening 14 corresponding to the positions of the liquid inlet 34 and the liquid outlet 35 of the liquid cooling plate 30 is opened on the box body 10 .

[0049] In this embodiment, the clearance opening 14 enables the liquid cooling plate 30 to be stably installed inside the box body 10 of the battery pack, and allows the cooling liquid pipeline to be introduced from the outside of the box body 10, avoiding spatial conflicts and structural interferences.

[0050] Furthermore, in order to optimize the flow path of the coolant and the heat conduction effect, the liquid inlet 34 is arranged at a position of the liquid cooling plate 30 close to the air outlet 13, and the liquid outlet 35 is arranged at a position of the liquid cooling plate 30 close to the air inlet 12. The coordination between the air flow and the flow direction of the liquid cooling liquid is utilized to improve the overall heat exchange efficiency.

[0051] In this embodiment, after the coolant enters the liquid cooling plate 30 from the liquid inlet 34, the liquid cooling plate 30 absorbs and takes away the heat generated by the module 20 through close contact with the surface of the battery module 20. In this process, the coolant and the heat source in the battery module 20 perform efficient heat exchange, and the temperature gradually increases. The liquid inlet 34 is set at the liquid cooling plate 30 near the air outlet 13, and the liquid outlet 35 is set at the liquid cooling plate 30 near the air inlet 12, so that the flow direction of the coolant is opposite to the flow direction of the wind. The heat dissipation efficiency of the coolant gradually decreases due to the increase in temperature, while the efficiency of air cooling in this direction gradually increases, thereby compensating for the decrease in heat dissipation efficiency and making the overall heat dissipation efficiency more uniform.

[0052] Furthermore, in order to optimize the heat conduction effect, the liquid inlet 34 is disposed at a position of the liquid cooling plate 30 close to the bottom of the box 10 , and the liquid outlet 35 is disposed at a position of the liquid cooling plate 30 close to the top of the box 10 .

[0053] In this embodiment, it is considered that the liquid will release bubbles as the temperature rises during the flow process, especially after contacting the heat source. Therefore, in this embodiment, the liquid inlet 34 is arranged at the position of the liquid cooling plate 30 close to the bottom of the box 10, and the liquid outlet 35 is arranged at the position of the liquid cooling plate 30 close to the top of the box 10. The liquid outlet 35 is arranged at the top to help discharge these bubbles from the system and prevent the bubbles from accumulating at the bottom, thereby affecting the normal operation of the liquid cooling system.

[0054] See also Figure 7 , Figure 7 The embodiment of the present invention provides Figure 6 A partial enlarged view of area A in the middle. In some embodiments, the liquid cooling plate 30 is slidably connected to the battery pack, and the liquid cooling plate 30 can move in a direction perpendicular to the air inlet 12 to the air outlet 13, so as to adjust the distance between the paired liquid cooling plates 30, so that the paired liquid cooling plates 30 can be moved closer to or farther from each other, thereby achieving a more flexible heat dissipation method.

[0055] Specifically, see Figure 8 and Fig. 9 , Figure 8 is a schematic diagram of another state of a battery pack provided by an embodiment of the present invention, Fig. 9It is a schematic diagram of another state of the battery pack provided by an embodiment of the present invention. When the paired liquid cooling plates 30 slide against each other through the slide rails and are adjusted to a position close to or fitted to each other, the liquid cooling plates 30 will no longer be in direct contact with the battery module 20, nor will the heat be taken away by the coolant. At this time, the cooling effect of the liquid cooling plate 30 stops completely. At this time, the battery pack switches to the air cooling mode. As the distance between the liquid cooling plates 30 decreases or even completely approaches, the air duct 16 space between the liquid cooling plates 30 also shrinks or disappears, so that the cooling wind can no longer flow through the inside of the liquid cooling plate 30. On the contrary, the cooling airflow directly acts on the surface of the battery module 20 through both sides of the liquid cooling plate 30, and begins to rely on the air cooling system for heat dissipation. In some embodiments, the battery cells 21 in the battery pack are arranged along the thickness direction, and the thickness direction is perpendicular to the wind flow direction, and there are gaps between the battery cells 21, so that when the battery pack is switched to the air cooling mode, the wind flow can pass through the gap between the batteries and pass through the module 20 to dissipate heat, greatly improving the heat dissipation efficiency.

[0056] In this embodiment, by adjusting the position of the liquid cooling plate 30, a third cooling mode is provided for the battery pack: air cooling mode, that is, the cooling air directly acts on the surface of the battery module 20, taking away the heat generated by the module 20, and the liquid cooling plate 30 no longer participates in heat dissipation. The entire heat dissipation process depends only on the air cooling system. When the heat dissipation demand is low, relying entirely on the air cooling system can save energy and avoid unnecessary operation of the liquid cooling system.

[0057] Furthermore, in this embodiment, in order to realize the sliding connection between the liquid cooling plate 30 and the slide rail, a specific sliding connection setting is provided, and the box body 10 of the battery pack is provided with through grooves 15 at opposite ends of the air duct 16. Connecting blocks 36 are provided at opposite ends of the liquid cooling plate 30, and the connecting blocks 36 pass through the through grooves 15 and are slidably connected with the through grooves 15, so that the liquid cooling plate 30 can slide along the through grooves 15 inside the box body 10, thereby adjusting the distance between the liquid cooling plates 30 and realizing flexible switching of the heat dissipation mode.

[0058] In this embodiment, the connection block 36 matches the structure of the through slot 15 and can freely pass through the through slot 15, so that the liquid cooling plate 30 can stably move along the direction of the through slot 15 without being separated from the slide rail due to external force. It also has sufficient mechanical strength to support the load generated by the liquid cooling plate 30 during the adjustment process.

[0059] Furthermore, in order to improve the stability of the liquid cooling plate 30 in the battery pack, a fixing member 40 is introduced in this embodiment. The fixing member 40 is used to connect the liquid cooling plate 30 and the box body 10, and ensure that the liquid cooling plate 30 can be firmly maintained at a predetermined position during the adjustment process, and prevent the liquid cooling plate 30 from being displaced or loosened due to external force during use.

[0060] In this embodiment, the fixing member 40 is made of an elastic material and includes a free end and a fixed end. The fixed end of the fixing member 40 is connected to the liquid cooling plate 30, and the free end is in contact with the box body 10. The arrangement of the fixing member 40 ensures that a certain contact pressure is always maintained between the liquid cooling plate 30 and the box body 10, and can provide sufficient locking force when the liquid cooling plate 30 is slidably adjusted, so that the liquid cooling plate 30 can be stably maintained in the adjusted position.

[0061] See also Fig.10 , Fig.10 3 is a schematic diagram of the structure of a liquid cooling plate 30 provided in an embodiment of the present invention. In some embodiments, the liquid cooling plate 30 further includes a plurality of protrusions 37, which are generally protrusion structures formed on the surface of the liquid cooling plate 30 and can take different shapes such as columnar, conical, and strip-shaped. The protrusions 37 are distributed on the surface of the liquid cooling plate 30, especially on the side of the liquid cooling plate 30 close to the air duct 16, and are arranged at intervals from each other.

[0062] In this embodiment, the presence of the protrusions 37 can significantly improve the heat dissipation capacity of the battery pack. On the one hand, the protrusions 37 can effectively increase the surface area of ​​the liquid cooling plate 30 in contact with the airflow in the air duct 16, thereby enhancing the heat exchange effect between the liquid cooling plate 30 and the air flow and improving the heat dissipation efficiency. On the other hand, the spacing between the protrusions 37 and the plane portion of the liquid cooling plate 30 allows the airflow to generate eddies through these protrusions 37 when flowing on the surface of the liquid cooling plate 30, thereby increasing the time and area of ​​contact between the airflow and the liquid cooling plate 30.

[0063] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0064] It should also be noted that when an element is referred to as being "fixed on" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element at the same time. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or may be indirectly connected to the other element through an intermediate element.

[0065] In addition, the descriptions of "first", "second", etc. in the present invention are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0066] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A battery pack, characterized in that: include: A box body is provided with a receiving cavity, and an air inlet and an air outlet are arranged at opposite ends of the box body and communicated with the receiving cavity; A fan connected to the box body and covering the air inlet and / or the air outlet; A plurality of modules are arranged in the accommodating cavity at intervals; Liquid cooling plates are arranged in pairs in the accommodating cavity and located between adjacent modules. The air inlet and the air outlet are located between the paired liquid cooling plates. Air ducts are formed between the liquid cooling plates. The liquid cooling plates are used to fit the modules.

2. A battery pack according to claim 1, characterized in that: The liquid cooling plate includes a main board and a support plate connected to each other, the main board extends in a first direction, the support plate extends in a second direction, the first direction is from the air inlet to the air outlet, the second direction is perpendicular to the first direction, the main board is connected to one side of the module, and the support plate is inserted into the module.

3. A battery pack according to claim 2, characterized in that: The module includes a plurality of battery cells, which are arranged along the thickness direction thereof. The thickness direction of the battery cells and the first direction are parallel to each other. The support plate is arranged in the gap between adjacent battery cells and contacts the battery cells.

4. A battery pack according to claim 1, characterized in that: The liquid cooling plate further comprises a cover body. The liquid cooling plate is provided with a liquid inlet and a liquid outlet. The cover body is used to cover and seal the liquid inlet and the liquid outlet.

5. A battery pack according to claim 4, characterized in that: The box body is provided with a clearance opening, and the clearance opening is respectively penetrated at one end of the liquid cooling plate where the liquid inlet is provided and at the other end where the liquid outlet is provided.

6. A battery pack according to claim 4, characterized in that: The liquid inlet is arranged on the liquid cooling plate near the air outlet, and the liquid outlet is arranged on the liquid cooling plate near the air inlet.

7. A battery pack according to claim 4, characterized in that: The liquid inlet is arranged at a region where the liquid cooling plate is close to the bottom of the box, and the liquid outlet is arranged at a region where the liquid cooling plate is close to the top of the box.

8. The battery pack according to claim 1, characterized in that: The liquid cooling plates are slidably connected to the box body, and the sliding direction is perpendicular to the direction from the air inlet to the air outlet. The paired liquid cooling plates can be close to or away from each other.

9. A battery pack according to claim 8, characterized in that: The box body is provided with through slots at opposite ends of the air duct, and connecting blocks are arranged at opposite ends of the liquid cooling plate. The connecting blocks pass through the through slots and are slidably connected with the through slots.

10. A battery pack according to claim 8, characterized in that: The battery pack also includes a fixing member, which connects the liquid cooling plate and the box body and is used to fix the position of the liquid cooling plate.

11. A battery pack according to any one of claims 1 to 10, characterized in that: The liquid cooling plate further includes a plurality of protrusions, which are arranged on a side of the liquid cooling plate close to the air duct and are spaced apart from each other.

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