Battery module and battery pack

Abstract

The utility model provides a battery module and a battery pack. The battery module comprises a plurality of battery cells which are arranged along the thickness direction of the battery cells; the heat dissipation parts are arranged on at least one side of each battery cell in the thickness direction of the battery cells, each heat dissipation part is provided with a plurality of medium flow channels, the medium flow channels are arranged at intervals in the direction forming an included angle with the thickness direction of the battery cells, cooling media are arranged in the medium flow channels, and the cooling media are made of phase change materials. According to the technical scheme provided by the utility model, the problems of high cost and complex process caused by the heat dissipation mode of the battery module in the prior art are solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery module technical field, specifically, relate to a kind of battery module and battery pack. BACKGROUND

[0002] With the rapid development of new energy vehicles and portable electronic devices, soft package battery is widely used in the market due to its lightness, high energy density, flexibility and other advantages. The traditional cooling method, such as air cooling, has limited cooling effect, especially in high-power and high-energy density use scenarios, the internal temperature of the battery pack can easily rise, leading to a decrease in battery performance, and even the risk of overheating causing safety problems.

[0003] Liquid cooling technology, as an efficient cooling method, can more effectively control the temperature of the battery and improve the stability and life of the battery. However, the complexity of the liquid cooling system and the high requirements for the production process of the liquid cooling plate, such as the need for a circulating pipeline of the liquid cooling system and the need for a mold to produce the liquid cooling plate, can increase the cost and complexity of the process, thereby limiting its widespread application in soft package batteries. SUMMARY

[0004] The main purpose of the utility model is to provide a battery module and a battery pack to solve the problem of high cost and complex process of the battery module in the prior art.

[0005] To achieve the above purpose, the utility model provides a battery module, which comprises a plurality of battery cells arranged along the thickness direction of the battery cells; a heat dissipation member is provided on at least one side of each battery cell along the thickness direction of the battery cells, and the heat dissipation member has a plurality of medium flow channels, which are arranged at an angle to the thickness direction of the battery cells; a cooling medium is provided in each medium flow channel, and the cooling medium is made of a phase change material.

[0006] Through the above arrangement, the heat dissipation member is arranged on at least one side of the battery cell, and a plurality of medium flow channels are arranged inside the heat dissipation member, and the arrangement direction of the medium flow channels is arranged at an angle to the thickness direction of the battery cell, so that the flow path of the cooling medium in the flow channel forms a more effective heat exchange interface with the surface of the battery cell, to increase the heat exchange area, thereby improving the heat conduction efficiency; and the phase change material is used as the cooling medium, which changes phase from liquid to gas when absorbing heat, and the phase change process can absorb a large amount of heat, thereby quickly and uniformly reducing the temperature of the battery cell; compared with the air cooling or liquid cooling cooling method in the prior art, the heat dissipation member of the utility model can effectively avoid the risk of overheating of the battery pack, thereby avoiding the need to set up a complex liquid cooling system, which can simplify the production process of the cooling system and reduce the production cost.

[0007] Further, the heat dissipation member comprises a heat dissipation body and a heat dissipation fin connected with the heat dissipation body, the heat dissipation fin is located above the heat dissipation body along the height direction of the battery cell, and the heat dissipation fin protrudes from the battery cell.

[0008] Through the above arrangement, the gas formed after the phase change of the liquid material can quickly release heat and recondense under the action of the heat dissipation fin, so that the rapid transfer of heat can be realized, thereby ensuring the uniform temperature performance of the battery module and the heat dissipation efficiency of the battery cell.

[0009] Further, the medium flow channel extends along the height direction of the battery cell, and the medium flow channel comprises an evaporation section and a cooling section connected in communication, and the cooling section is located above the evaporation section.

[0010] Through the above arrangement, the phase change cooling principle of the heat pipe is effectively utilized to realize efficient heat dissipation of the battery pack.

[0011] Further, at least one side of the heat dissipation body is provided with a recessed portion for forming a buffer area along the thickness direction of the battery cell.

[0012] Through the above arrangement, the expansion pressure of the battery cell during charging and discharging can be effectively absorbed, and damage caused by direct contact between the battery cell and the heat dissipation member can be prevented, thereby protecting the battery cell and the heat dissipation member, and further prolonging the service life of the battery module.

[0013] Further, the battery module further comprises a connecting member for connecting the heat dissipation member and the battery cell, or the phase change material is any one of pentane, paraffin, n-octadecane and n-nonadecane.

[0014] Through the above arrangement, the structural stability between the battery cell and the heat dissipation member can be enhanced through the connecting effect of the connecting member, especially when the battery pack is subjected to vibration or impact, the relative displacement between the battery cell and the heat dissipation member can be effectively reduced, thereby avoiding the problem of reduced heat dissipation efficiency caused by poor contact, and further ensuring the overall stability and safety of the battery module.

[0015] Further, the connecting member is located between the heat dissipation member and the battery cell, and the connecting member is made of heat-conducting structural adhesive.

[0016] Through the above arrangement, the thermal resistance between the battery cell and the heat dissipation member can be significantly reduced, and the rapid conduction of heat can be promoted. When the battery cell generates heat during operation, the heat can be quickly transferred to the heat dissipation member through the heat-conducting structural adhesive, and then efficiently dissipated through the heat pipe and the cooling medium in the heat dissipation member, thereby effectively controlling the temperature of the battery cell, prolonging the service life of the battery, and improving safety.

[0017] Further, the battery module further comprises a plurality of heat runaway prevention devices, and the heat runaway prevention devices and the heat dissipation member are alternately arranged along the thickness direction of the battery cell.

[0018] Through the above arrangement, by setting the heat loss prevention component, effective thermal isolation can be formed between the two battery cells, and once thermal runaway occurs in a certain battery cell, the heat loss prevention component can prevent the heat from rapidly spreading to the adjacent battery cell, thereby avoiding thermal runaway of the entire battery module, and significantly improving the safety of the battery module under extreme conditions.

[0019] Further, the heat loss prevention component is made of aerogel material.

[0020] Through the above arrangement, the aerogel material has excellent thermal stability and high-temperature resistance, can maintain structural stability under high-temperature environment, is not damaged by thermal runaway behavior, ensures the safety and reliability of the battery module under extreme conditions, effectively isolates the heat transfer between the battery cells, and once thermal runaway occurs in a certain battery cell, the aerogel can quickly prevent the heat from spreading to the adjacent battery cell, thereby reducing the impact of thermal runaway on the entire battery module and improving the safety of the battery system.

[0021] Further, the battery module further comprises two end plates, which are arranged in the thickness direction of the battery cell and are spaced apart, and the plurality of battery cells are located between the two end plates;Two side plates are arranged in a direction at an angle to the thickness direction of the battery cell, and are spaced apart, and the plurality of battery cells are located between the two side plates, and each side plate is connected with the two end plates.

[0022] Through the above arrangement, by setting two end plates and two side plates, a stable frame structure can be formed to wrap the plurality of battery cells, providing firm support for the battery cells, so that the battery module can effectively resist external impact and vibration during transportation and use, protecting the battery cells from physical damage and prolonging the service life of the battery.

[0023] According to another aspect of the present application, the present application provides a battery pack comprising a shell and the above-mentioned battery module located in the shell.

[0024] The technical scheme of the present application sets the heat dissipation member on at least one side of the battery cell, sets a plurality of medium flow channels inside the heat dissipation member, and arranges the plurality of medium flow channels at an angle to the thickness direction of the battery cell, so that the flow path of the cooling medium in the flow channel forms a more effective heat exchange interface with the surface of the battery cell, thereby increasing the heat exchange area and improving the heat conduction efficiency;And the phase change material is used as the cooling medium, which changes phase from liquid to gas when absorbing heat, and the phase change process can absorb a large amount of heat, thereby quickly and uniformly reducing the temperature of the battery cell;Compared with the air cooling or liquid cooling heat dissipation mode in the prior art, the heat dissipation member of the present application can effectively avoid the risk of over-temperature of the battery pack, thereby avoiding the setting of a complex liquid cooling system, and further simplifying the production process of the heat dissipation system and reducing the production cost. BRIEF DESCRIPTION OF DRAWINGS

[0025] The drawings accompanying the specification of this application serve to provide further understanding of the present application, the illustrative embodiments of the present application and their descriptions serve to explain the present application, and do not constitute an improper limitation on the present application. In the drawings:

[0026] Figure 1 A structural schematic view of an embodiment of the battery module of the present application is shown;

[0027] Figure 2 A partial structural schematic view of the battery module of Figure 1 is shown;

[0028] Figure 3 A partial structural schematic view of the battery module of Figure 1 is shown;

[0029] Figure 4 A structural schematic view of the heat dissipation member of the battery module of Figure 1 is shown;

[0030] Figure 5 A front view of the heat dissipation member of Figure 4 is shown; (the internal structure of the heat dissipation member is shown)

[0031] Figure 6 A heat transfer schematic view of the battery module of Figure 1 is shown.

[0032] Among the above drawings, the following reference signs are included:

[0033] 1, foam; 2, battery cell; 3, heat dissipation member; 4, side plate; 5, end plate; 6, heat runaway prevention member; 7, connecting member; 8, heat dissipation fin; 9, recessed portion; 10, medium flow channel; 11, heat conduction and heat dissipation direction; 12, convection heat dissipation direction. DETAILED DESCRIPTION

[0034] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the drawings and in combination with embodiments.

[0035] It should be noted that the battery pack of the embodiments of the present application is a soft-pack battery.

[0036] As Figures 1 to 5As shown, an embodiment of this utility model provides a battery module. The battery module includes: a plurality of battery cells 2 arranged along the thickness direction of the battery cells 2; a heat sink 3 arranged along the thickness direction of the battery cells 2, with at least one side of each battery cell 2 having a heat sink 3, the heat sink 3 having a plurality of medium flow channels 10, the plurality of medium flow channels 10 being spaced apart along a direction that is at an angle to the thickness direction of the battery cells 2, and each medium flow channel 10 containing a cooling medium made of a phase change material.

[0037] In the above technical solution, by providing a heat sink 3 on at least one side of the battery cell 2, and providing multiple medium flow channels 10 inside the heat sink 3, with the arrangement direction of the multiple medium flow channels 10 forming an angle with the thickness direction of the battery cell 2, the flow path of the cooling medium in the flow channel forms a more effective heat exchange interface with the surface of the battery cell, thereby increasing the heat exchange area and improving the heat conduction efficiency; and by using a phase change material as the cooling medium, it undergoes a phase change when absorbing heat, changing from a liquid state to a gas state. The phase change process can absorb a large amount of heat, thereby rapidly and uniformly reducing the temperature of the battery cell; compared with the air cooling or liquid cooling methods in the prior art, the heat sink 3 of this utility model can effectively avoid the risk of battery pack overheating, thereby avoiding the need to set up a complex liquid cooling system, simplifying the production process of the heat dissipation system, and reducing production costs.

[0038] Preferably, in the embodiments of this utility model, the phase change material is any one of pentane, paraffin, n-octadecane, and n-nonadecane.

[0039] It should be noted that, in the embodiments of this utility model, technicians can set the cross-sectional area of ​​the medium flow channel 10 according to the thickness of the heat sink 3 and their experience.

[0040] like Figure 4 and Figure 5 As shown in the embodiment of this utility model, the heat sink 3 includes a heat sink body and heat sink fins 8 connected to the heat sink body. Along the height direction of the battery cell 2, the heat sink fins 8 are located above the heat sink body and protrude from the battery cell 2.

[0041] With the above settings, the gas formed after the phase change of the liquid material can quickly release heat and recondense under the action of the heat dissipation fins 8, thereby achieving rapid heat transfer and ensuring the uniform temperature performance of the battery module and the heat dissipation efficiency of the cell.

[0042] Specifically, in the embodiment of the utility model, the heat dissipation piece 3 is provided with independent and parallel multiple micro grooves, the multiple micro grooves form multiple medium flow channels 10, and cooling medium is introduced into the micro grooves. At this time, the heat dissipation piece 3 is equivalent to multiple heat pipes integrated together, and the heat dissipation piece 3 is improved in heat conduction performance by using the high-efficiency heat conduction and phase change cooling principle of the heat pipes, so that the heat dissipation performance and safety of the soft package battery are improved. The heat pipe is used to rapidly transfer the heat of a heating object to the outside of a heat source by heat conduction and phase change.

[0043] Preferably, in the embodiment of the utility model, the 1-series aluminum is used as the material of the heat dissipation piece 3, so that the heat conduction performance of the heat dissipation piece 3 can be improved, the structural strength of the entire battery module can be improved, the stability of the heat dissipation piece 3 under the battery expansion pressure can be ensured, and the service life and safety of the battery module are improved.

[0044] As shown in Figure 5 In the embodiment of the utility model, the medium flow channel 10 extends along the height direction of the battery cell 2, and the medium flow channel includes an evaporation section and a cooling section connected in series, and the cooling section is located above the evaporation section.

[0045] By the above arrangement, the phase change cooling principle of the heat pipe is effectively used to achieve efficient heat dissipation of the battery pack.

[0046] Specifically, in the embodiment of the utility model, when the battery cell 2 generates heat during operation, the cooling medium is evaporated by heat in the evaporation section, the evaporation section located below can rapidly absorb heat to form steam, the steam rises along the height direction of the battery cell 2 and enters the cooling section located above, in the cooling section, the steam contacts the relatively low-temperature heat dissipation fins 8 to release heat and recondense into liquid, this process rapidly transfers the heat of the battery cell 2 to the heat dissipation fins 8, the heat is dissipated to the environment through natural convection and forced air cooling of the heat dissipation fins 8, and the rapid cooling of the battery cell 2 can be achieved.

[0047] Further, the vertical design of the medium flow channel 10 fully utilizes the auxiliary effect of gravity and natural convection, reduces the demand for an additional power system, simplifies the design and production process of the heat dissipation piece 3, reduces the cost, and improves the practicability and reliability of the heat dissipation piece.

[0048] As shown in Figure 4 In the embodiment of the utility model, at least one side of the heat dissipation body is provided with a recessed part 9 for forming a buffer area along the thickness direction of the battery cell 2. In this way, the expansion pressure of the battery cell 2 during charging and discharging can be effectively absorbed, damage caused by direct contact between the battery cell 2 and the heat dissipation piece 3 can be prevented, so that the battery cell 2 and the heat dissipation piece 3 can be protected, and the service life of the battery module can be prolonged.

[0049] Preferably, the utility model discloses the both sides of the heat radiating body are equipped with recess 9, and recess 9 is the recess.

[0050] As Figure 6 The utility model discloses the embodiment, the battery module still includes connecting piece 7, and connecting piece 7 is used for connecting heat radiating part 3 and electric core 2.

[0051] Through the above-mentioned setting, through the connecting effect of connecting piece 7, the structural stability between electric core 2 and heat radiating part 3 can be enhanced, especially when battery pack is subjected to vibration or impact, the relative displacement between electric core 2 and heat radiating part 3 can be effectively reduced, thereby the problem of the decline of heat dissipation efficiency caused by poor contact can be avoided, and further the overall stability and safety of battery module can be guaranteed.

[0052] Preferably, the utility model discloses the embodiment, and connecting piece 7 is located between heat radiating part 3 and electric core 2, and connecting piece 7 is made of heat conducting structural glue. In this way, the thermal resistance between electric core 2 and heat radiating part 3 can be significantly reduced, and the rapid conduction of heat can be promoted. When electric core 2 generates heat in the working process, heat can be rapidly transferred to heat radiating part 3 through heat conducting structural glue, and then high-efficiency heat dissipation is carried out through the heat pipe and cooling medium in heat radiating part 3, so that the temperature of electric core can be effectively controlled, the service life of battery is prolonged, and safety is improved.

[0053] Further, the heat conducting structural glue not only has good thermal conductivity, but also has certain adhesive strength and elasticity, can firmly fix electric core 2 on heat radiating part 3, simultaneously provides a buffering action when electric core 2 expands, reduces the relative displacement between electric core 2 and heat radiating part 3, protects electric core 2 from mechanical damage, and enhances the overall structural strength and stability of battery module.

[0054] As Figure 2 The utility model discloses the embodiment, the battery module still includes a plurality of heat run away prevention 6, and heat run away prevention 6 and heat radiating part 3 are alternately arranged along the thickness direction of electric core 2.

[0055] In the above technical scheme, by setting heat run away prevention 6, effective thermal isolation can be formed between two electric cores 2, once heat run away occurs in a certain electric core 2, heat run away prevention 6 can prevent heat from rapidly spreading to adjacent electric core 2, so that the heat run away of the whole battery module is avoided, and the safety of battery module under extreme conditions is significantly improved.

[0056] Further, the alternate layout of heat radiating part 3 and heat run away prevention 6 not only makes the heat generated by electric core 2 can be more evenly distributed and transferred, but also makes full use of the space in battery module, realizes effective heat management and heat run away protection, ensures the compactness of battery module, and is beneficial to maximizing battery energy density in limited space.

[0057] Preferably, in the embodiment of the utility model, the heat runaway prevention part 6 is made of aerogel material. In this way, the aerogel material has excellent thermal stability and high-temperature resistance, can maintain structural stability under high-temperature environment, is not damaged by heat runaway behavior, ensures the safety and reliability of the battery module under extreme conditions, effectively isolates the heat transfer between the battery cells 2, and once heat runaway occurs in a certain battery cell, the aerogel can quickly prevent the heat from spreading to the adjacent battery cells 2, thereby reducing the influence of heat runaway on the entire battery module and improving the safety of the battery system.

[0058] As shown in Figure 1 the embodiment of the utility model, the battery module further comprises: two end plates 5, which are arranged at intervals along the thickness direction of the battery cells 2, and the plurality of battery cells 2 are located between the two end plates 5; two side plates 4, which are arranged at intervals along a direction at an angle to the thickness direction of the battery cells 2, and the plurality of battery cells 2 are located between the two side plates 4, and each side plate 4 is connected with the two end plates 5.

[0059] In the above technical solution, by arranging the two end plates 5 and the two side plates 4, a stable frame structure can be formed to wrap the plurality of battery cells 2, providing firm support for the battery cells 2, so that the battery module can effectively resist external impact and vibration during transportation and use, protecting the battery cells from physical damage and prolonging the service life of the battery.

[0060] Specifically, in the embodiment of the utility model, the battery module can be fixed with the box through the end plate 5, and the foam 1 is installed between the end plate 5 and the battery cell 2, which can play a buffering and insulating protection role.

[0061] Specifically, the heat transfer direction can be seen from Figure 6 In the working process of the battery cell 2, heat is generated, part of the heat is dissipated through air convection, that is, the heat is transferred along the convection heat dissipation direction 12. Most of the heat is transferred to the heat dissipation piece 3 through the heat conduction structure glue, that is, the heat is transferred along the heat conduction heat dissipation direction 11, the cooling medium in the medium flow channel 10 undergoes phase change to take away the heat of the battery cell 2, and the heat dissipation fin 8 cools the heat dissipation piece 3 through self-heat convection, finally reducing the temperature of the module.

[0062] It should be noted that, in the embodiment of the utility model, compared with the traditional heat dissipation mode, the heat dissipation piece 3 in contact with the large surface of the battery cell 2 is provided with a plurality of medium flow channels 10 to form a plurality of heat pipes, which can improve the uniform temperature performance of the module and increase the heat dissipation efficiency of the battery cell.

[0063] The embodiment of the utility model provides a kind of battery pack. Battery pack includes box and the above-mentioned battery module in box.

[0064] The above battery pack has all the advantages of the above battery module, which will not be repeated here.

[0065] From the above description, it can be seen that the above-mentioned embodiments of the utility model realize the following technical effects: by setting the heat dissipation piece on at least one side of the battery cell, and setting multiple medium flow channels inside the heat dissipation piece, and setting the multiple medium flow channels in an angle with the thickness direction of the battery cell, the flow path of the cooling medium in the flow channel and the surface of the battery cell form a more effective heat exchange interface, so as to increase the heat exchange area, so that the heat conduction efficiency can be improved; and the phase change material is used as the cooling medium, which changes phase when absorbing heat, changes from liquid state to gaseous state, and the phase change process can absorb a large amount of heat, so that the temperature of the battery cell can be quickly and uniformly reduced; compared with the air cooling or liquid cooling heat dissipation mode in the prior art, the heat dissipation piece of the utility model can effectively avoid the risk of over-temperature of the battery pack, so that the complex liquid cooling system can be avoided, and the production process of the heat dissipation system can be simplified, and the production cost can be reduced.

[0066] The above only describes the preferred embodiments of the utility model and is not used to limit the utility model, and the utility model can have various changes and changes for the person skilled in the art. Any modification, equivalent replacement, improvement, etc. within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A battery module, characterized by, The battery module comprises: a plurality of battery cells (2) arranged along the thickness direction of the battery cells (2); a plurality of heat dissipation members (3) arranged on at least one side of each battery cell (2) along the thickness direction of the battery cells (2), wherein each heat dissipation member (3) comprises a plurality of medium flow channels (10) arranged along a direction at an angle to the thickness direction of the battery cells (2), and each medium flow channel (10) is filled with a cooling medium made of a phase change material.

2. The battery module of claim 1, wherein, The heat dissipation member (3) comprises a heat dissipation body and a heat dissipation fin (8) connected to the heat dissipation body, wherein the heat dissipation fin (8) is located above the heat dissipation body along the height direction of the battery cells (2), and the heat dissipation fin (8) protrudes from the battery cells (2).

3. The battery module of claim 2, wherein, The medium flow channel (10) extends along the height direction of the battery cells (2), and comprises an evaporation section and a cooling section connected in series, wherein the cooling section is located above the evaporation section.

4. The battery module of claim 2, wherein, At least one side of the heat dissipation body is provided with a recess (9) for forming a buffer area along the thickness direction of the battery cells (2).

5. The battery module according to any one of claims 1 to 4, characterized in that, The battery module further comprises a connecting member (7) for connecting the heat dissipation member (3) and the battery cells (2), or the phase change material is any one of pentane, paraffin, n-octadecane and n-nonadecane.

6. The battery module of claim 5, wherein, The connecting member (7) is located between the heat dissipation member (3) and the battery cells (2), and is made of a heat-conducting structural adhesive.

7. The battery module according to any one of claims 1 to 4, characterized by, The battery module further comprises a plurality of thermal runaway prevention members (6) arranged alternately with the heat dissipation members (3) along the thickness direction of the battery cells (2).

8. The battery module of claim 7, wherein, The thermal runaway prevention member (6) is made of aerogel material.

9. The battery module of any one of claims 1 to 4, wherein, The battery module further comprises: two end plates (5) arranged along the thickness direction of the battery cells (2) and spaced apart, and a plurality of battery cells (2) are located between the two end plates (5); two side plates (4) arranged along a direction at an angle to the thickness direction of the battery cells (2) and spaced apart, and a plurality of battery cells (2) are located between the two side plates (4), and each side plate (4) is connected to the two end plates (5).

10. A battery pack, characterized by, The battery module comprises a box body and the battery module according to any one of claims 1 to 9 arranged in the box body.

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