Battery pack and energy storage device

Abstract

The utility model provides a battery pack and an energy storage device, and belongs to the technical field of batteries, and the battery pack comprises a box body, a battery module, an integrated busbar and a heat conduction buffer layer. The box body is provided with a containing cavity; and the battery module, the integrated busbar and the heat-conducting buffer layer are arranged in the accommodating cavity. Wherein the integrated busbar is connected with the battery module, and the heat conduction buffer layer is located on the side, away from the battery module, of the integrated busbar. According to the battery pack provided by the embodiment of the invention, the heat conduction buffer layer is arranged on one side, deviating from the battery module, of the integrated busbar, so that heat generated by the battery module can be transmitted to the box body through the integrated busbar and the heat conduction buffer piece, and then the heat generated by the battery module is dissipated to the outside through the box body, and the heat dissipation performance of the battery pack is ensured. Meanwhile, the heat-conducting buffer layer also has a buffer effect, and when the battery cells in the battery module are heated to expand, the heat-conducting buffer layer can absorb the expansion force and expansion displacement of the battery cells, so that the influence of expansion on the box body is reduced, and the safety and stability of the battery pack are improved.

Description

Technical Field

[0001] This application relates to the field of battery technology, specifically to a battery pack and energy storage device. Background Technology

[0002] As the capacity of battery cells in battery packs continues to increase, the heat generated by these cells is also growing. If the heat dissipated by the cells within the battery pack cannot be released, it will lead to heat accumulation, affecting the battery pack's lifespan. When cells are heated or during charging and discharging, they will expand, which can easily cause deformation and damage to the battery pack casing, thus affecting the battery pack's safety performance. Utility Model Content

[0003] The embodiments of this application provide a battery pack that can reduce the impact of cell expansion on the casing while ensuring heat dissipation performance, reduce casing deformation and damage, and improve battery pack safety performance.

[0004] In a first aspect, embodiments of this application provide a battery pack, comprising:

[0005] The box has a receiving cavity;

[0006] The battery module is housed within the receiving cavity;

[0007] An integrated busbar is housed within the receiving cavity and connected to the battery module;

[0008] A thermally conductive buffer layer is disposed within the receiving cavity and located on the side of the integrated busbar away from the battery module.

[0009] In some embodiments, the thermally conductive buffer layer includes a thermally conductive silicone layer.

[0010] In some embodiments, the housing includes a first liquid cooling plate;

[0011] The first liquid cooling plate is located on the side of the thermally conductive buffer layer away from the battery module.

[0012] In some embodiments, an insulating support is provided on the side of the integrated busbar facing away from the battery module;

[0013] The insulating support has a groove structure, and the thermally conductive buffer layer is located inside the groove structure.

[0014] In some embodiments, the integrated busbar includes multiple busbars configured to connect two adjacent cells in a battery module;

[0015] The groove structure includes multiple groove sections, each corresponding to a busbar.

[0016] The thermally conductive buffer layer includes multiple thermally conductive silicone pads, which are disposed within the grooves and correspond one-to-one with the grooves.

[0017] In some embodiments, a through hole is provided in the groove, through which the thermally conductive silicone pad contacts the busbar.

[0018] In some embodiments, the housing further includes a frame structure and a second liquid cooling plate, wherein the first liquid cooling plate and the second liquid cooling plate are respectively disposed on opposite sides of the frame structure in a first direction;

[0019] The first liquid cooling plate and the second liquid cooling plate are respectively connected to the frame structure to form a box. The second liquid cooling plate is located on the side of the battery module away from the integrated busbar.

[0020] In some embodiments, a thermally conductive layer is provided between the battery module and the second liquid cooling plate.

[0021] In some embodiments, the thermally conductive layer includes a thermally conductive structural adhesive layer.

[0022] In some embodiments, the first liquid cooling plate is provided with a first liquid inlet and a first liquid outlet, which are respectively located on opposite sides of the first liquid cooling plate.

[0023] In some embodiments, it further includes a first inlet pipe and a first outlet pipe;

[0024] The first inlet pipe is connected to the first inlet port, and the first outlet pipe is connected to the first outlet port;

[0025] The inlet and outlet pipes are located outside the receiving cavity, and both the inlet and outlet pipes are located on the side of the first liquid cooling plate near the battery module.

[0026] In some embodiments, the second liquid cooling plate includes a second liquid inlet and a second liquid outlet, the second liquid inlet and the liquid outlet being disposed on the same side of the second liquid cooling plate.

[0027] Secondly, this application also provides an energy storage device, including the battery pack described above.

[0028] The beneficial effects of the embodiments of this application are as follows:

[0029] In embodiments of this application, the battery pack includes a housing, battery modules, an integrated busbar, and a thermally conductive buffer layer. The housing has a receiving cavity, within which the battery modules, integrated busbar, and thermally conductive buffer layer are all disposed. The integrated busbar is connected to the battery modules, and the thermally conductive buffer layer is located on the side of the integrated busbar facing away from the battery modules. By placing the thermally conductive buffer layer on the side of the integrated busbar facing away from the battery modules, the heat generated by the battery modules can be transferred to the housing through the integrated busbar and the thermally conductive buffer, and then dissipated to the outside by the housing, ensuring the heat dissipation performance of the battery pack. Simultaneously, the thermally conductive buffer layer also has a buffering function; when the cells in the battery modules expand due to heat, the thermally conductive buffer layer can absorb the expansion force and displacement of the cells, reducing the impact of expansion on the housing and improving the safety and stability of the battery pack. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 This is an exploded structural diagram of the battery pack provided in an embodiment of this application;

[0032] Figure 2 This is a schematic diagram of the assembly structure of the integrated busbar and insulating support provided in an embodiment of this application;

[0033] Figure 3 yes Figure 2 Enlarged view of point A in the middle;

[0034] Figure 4 This is a schematic diagram of the structure of the thermally conductive buffer layer provided in an embodiment of this application;

[0035] Figure 5 This is a schematic diagram of the structure of the first liquid cooling plate provided in the embodiments of this application. Figure 1 ;

[0036] Figure 6 This is a schematic diagram of the structure of the first liquid cooling plate provided in the embodiments of this application. Figure 2 ;

[0037] Figure 7 This is a schematic diagram of the structure of the first liquid cooling plate provided in the embodiments of this application. Figure 3 ;

[0038] Figure 8 This is a schematic diagram of the assembly structure of the frame structure and the second liquid cooling plate provided in the embodiments of this application;

[0039] Figure 9 This is a three-dimensional structural diagram of the battery pack provided in an embodiment of this application.

[0040] Explanation of reference numerals in the attached figures:

[0041] 1. Housing; 11. First liquid cooling plate; 111. First liquid inlet; 112. First liquid outlet; 113. First liquid inlet pipe; 114. First liquid outlet pipe; 115. First flow channel; 12. Frame structure; 13. Second liquid cooling plate; 131. Second liquid inlet; 132. Second liquid outlet; 2. Battery module; 3. Integrated busbar; 31. Busbar; 4. Insulating bracket; 41. Groove structure; 411. Groove section; 5. Thermally conductive buffer layer; 51. Thermally conductive silicone pad; 6. Thermally conductive layer. Detailed Implementation

[0042] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application. In addition, it should be understood that the specific embodiments described herein are only for illustration and explanation of this application and are not intended to limit this application. In this application, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the upper and lower positions of the device in actual use or operation, specifically the drawing directions in the accompanying drawings; while "inner" and "outer" refer to the outline of the device.

[0043] Firstly, such as Figure 1 As shown, an embodiment of this application provides a battery pack, including a housing 1, a battery module 2, an integrated busbar 3, and a thermally conductive buffer layer 5. The housing 1 has a receiving cavity, within which the battery module 2, the integrated busbar 3, and the thermally conductive buffer layer 5 are all disposed. The integrated busbar 3 is connected to the battery module 2, and the thermally conductive buffer layer 5 is located on the side of the integrated busbar 3 facing away from the battery module 2. By placing the thermally conductive buffer layer 5 on the side of the integrated busbar 3 facing away from the battery module 2, the heat generated by the battery module 2 can be transferred to the housing 1 through the integrated busbar 3 and the thermally conductive buffer, and then dissipated to the outside by the housing 1, ensuring the heat dissipation performance of the battery pack. Simultaneously, the thermally conductive buffer layer 5 also has a buffering function; when the cells in the battery module 2 expand due to heat, the thermally conductive buffer layer 5 can absorb the expansion force and displacement of the cells, reducing the impact of expansion on the housing 1 and improving the safety and stability of the battery pack.

[0044] Among them, the thermally conductive buffer layer 5 refers to a composite structural layer that combines thermal conductivity and buffering performance. The thermally conductive buffer layer 5 can transfer the heat generated by the battery module 2 to the housing 1 or heat dissipation components, improving the heat dissipation performance of the battery pack. At the same time, it can also provide a buffering effect for the integrated busbar 3 and the housing 1. When the cells in the battery module 2 expand, it can at least offset part of the expansion force and expansion displacement, improving the stability and safety of the battery pack.

[0045] For example, the thermally conductive buffer layer 5 includes at least one of silicon-based thermally conductive buffer layer 5, graphite-based thermally conductive buffer layer 5, metal composite thermally conductive buffer layer 5, and ceramic-based thermally conductive buffer layer 5.

[0046] In some embodiments, the thermally conductive buffer layer 5 includes a thermally conductive silicone layer. The thermally conductive silicone layer has excellent thermal conductivity, enabling it to rapidly conduct heat generated by the battery module 2 to the external heat dissipation system, thereby effectively reducing the internal temperature of the battery pack and preventing localized overheating. The thermally conductive silicone layer also improves the tightness of the connection between the housing 1 and the integrated busbar 3, reducing thermal resistance and improving thermal contact efficiency, thus enhancing heat dissipation. The thermally conductive silicone layer has good softness and elasticity, enabling it to absorb and alleviate mechanical stress generated during charging, discharging, and vibration of the battery pack, enhancing the mechanical stability of the battery pack. When the battery pack expands due to charging, discharging, or thermal expansion, and the cells in the battery module 2 expand due to heat, the thermally conductive silicone layer can absorb at least part of the expansion force or expansion capacity, reducing the occurrence of deformation and damage to the housing 1 caused by expansion.

[0047] In some embodiments, such as Figure 1 As shown, the housing 1 includes a first liquid cooling plate 11, which is disposed on the side of the thermally conductive buffer layer 5 away from the battery module 2. The first liquid cooling plate 11 utilizes the high heat transfer coefficient of liquid flow to rapidly absorb and dissipate the heat generated by the battery module 2 through the circulating coolant. Compared to air cooling, it has higher heat transfer efficiency and lower thermal resistance.

[0048] In this embodiment, the first liquid cooling plate 11 is disposed on the side of the thermally conductive buffer layer 5 away from the battery module 2. The first liquid cooling plate 11 can serve as the top plate of the housing 1, ensuring the heat dissipation effect of the battery pack while simplifying the structure of the housing 1. The thermally conductive buffer layer 5 is disposed between the first liquid cooling plate 11 and the integrated busbar 3. On the one hand, the thermally conductive buffer layer 5 can improve the tightness of the connection between the first liquid cooling plate 11 and the integrated busbar 3, so that the heat generated by the battery module 2 can be better conducted to the first liquid cooling plate 11. On the other hand, the thermally conductive buffer layer 5 has a buffering effect, which can reduce the deformation and damage of the first liquid cooling plate 11 caused by the expansion of the battery module 2, thereby improving the heat dissipation stability and safety of the battery pack.

[0049] In some embodiments, such as Figure 1 and Figure 2As shown, an insulating support 4 is provided on the side of the integrated busbar 3 away from the battery module 2. A groove structure 41 is provided on the insulating support 4, and a thermally conductive buffer layer 5 is located in the groove structure 41.

[0050] By setting an insulating support 4 on the side of the integrated busbar 3 away from the battery module 2, and placing the thermally conductive buffer layer 5 in the groove structure 41 between the insulation, on the one hand, the thermally conductive buffer layer 5 can directly contact the integrated busbar 3 that needs heat dissipation, thereby improving heat dissipation efficiency; on the other hand, the groove structure 41 limits the thermally conductive buffer layer 5, thereby improving the structural stability of the battery pack.

[0051] In some embodiments, such as Figure 3 and Figure 4 As shown, the integrated busbar 3 includes multiple busbars 31, which are configured to connect two adjacent cells in the battery module 2. The groove structure 41 includes multiple groove portions 411, which are correspondingly arranged with the busbars 31. The thermally conductive buffer layer 5 includes multiple thermally conductive silicone pads 51, which are disposed within the groove portions 411 and are correspondingly arranged with the groove portions 411.

[0052] Busbar 31 connects the battery cells in battery module 2 to transmit current. During the charging and discharging process of the battery pack, the battery cells in battery module 2 generate a large amount of heat, which is transferred to the busbar 31 in contact with them through thermal conduction. At the same time, as a current transmission medium, busbar 31 also generates Joule heat due to its resistance when a large current passes through it, further increasing the temperature of busbar 31. By aligning the recessed portion 411 with the busbar 31 one-to-one and the thermally conductive silicone pad 51 with the recessed portion 411 one-to-one, the thermally conductive silicone pad 51 can effectively conduct heat to the corresponding busbar 31, improving the targeted heat dissipation.

[0053] In some embodiments, such as Figure 3 As shown, a through hole is provided in the groove 411, through which the thermally conductive silicone pad 51 contacts the busbar 31. That is, by providing a through hole in the groove 411, the thermally conductive silicone pad 51 can directly contact the busbar 31, reducing the thermal resistance between the thermally conductive silicone pad 51 and the busbar 31 and improving heat dissipation performance.

[0054] For example, such as Figure 3 As shown, the groove 411 is provided corresponding to the busbar 31, and the bottom of the groove 411 is hollowed out so that the busbar 31 is exposed at the bottom of the groove 411. Since the thermally conductive silicone pad 51 is provided in the groove 411, the thermally conductive silicone pad 51 can directly contact the busbar 31, thereby reducing thermal resistance and improving the efficiency of heat conduction.

[0055] In some embodiments, such as Figure 1 and Figure 8 As shown, the housing 1 also includes a frame structure 12 and a second liquid cooling plate 13. The first liquid cooling plate 11 and the second liquid cooling plate 13 are respectively disposed on opposite sides of the frame structure 12 in the first direction Z. The first liquid cooling plate 11 and the second liquid cooling plate 13 are respectively connected to the frame structure 12 to form the housing 1. The second liquid cooling plate 13 is disposed on the side of the battery module 2 away from the integrated busbar 3.

[0056] In other words, the top and bottom of the battery pack housing 1 are respectively provided with a first liquid cooling plate 11 and a second liquid cooling plate 13. The first liquid cooling plate 11 and the second liquid cooling plate 13 can dissipate heat from the top and bottom of the battery module 2 respectively, increasing the heat dissipation area of ​​the battery module 2, thereby improving the heat dissipation performance of the battery pack.

[0057] It is understood that the frame structure 12 can be arranged around the battery module 2, and the frame structure 12 has openings on both sides of the first direction Z. The first liquid cooling plate 11 and the second liquid cooling plate 13 are respectively arranged at the openings on both sides of the frame structure 12 in the first direction, forming a box 1 with a receiving cavity.

[0058] The shape of the frame structure 12 can be configured to correspond to the shape of the battery module 2. For example, the frame structure 12 can be a cuboid, a cube, a cylinder, or other shapes. The first liquid cooling plate 11 and the second liquid cooling plate 13 can be configured according to the shape of the frame structure 12. For example, when the frame structure 12 is a cuboid, the first liquid cooling plate 11 and the second liquid cooling plate 13 can be configured to be rectangular; when the frame structure 12 is a cylinder, the first liquid cooling plate 11 and the second liquid cooling plate 13 can be configured to be circular.

[0059] The first liquid cooling plate 11 and the second liquid cooling plate 13 are respectively connected to the frame structure 12. Exemplarily, the first liquid cooling plate 11 and the frame structure 12 can be connected by screws. The first liquid cooling plate 11 has a first connecting hole in its circumferential direction, and the corresponding position of the frame structure 12 also has a second connecting hole. The first connecting hole and the second connecting hole are connected by screws. The second liquid cooling plate 13 and the frame structure 12 can be connected by welding.

[0060] In some embodiments, such as Figure 1 As shown, a thermally conductive layer 6 is provided between the battery module 2 and the second liquid cooling plate 13. By providing the thermally conductive layer 6 between the battery module 2 and the second liquid cooling plate 13, the thermal conductivity between the battery module 2 and the second liquid cooling plate 13 can be improved, the thermal resistance can be reduced, and the heat dissipation performance of the second liquid cooling plate 13 on the battery module 2 can be improved.

[0061] In some embodiments, the thermally conductive layer 6 includes a thermally conductive structural adhesive layer. This layer has high thermal conductivity, effectively transferring heat generated by the battery module 2 to the second liquid cooling plate 13, thereby achieving rapid heat dissipation and improving the heat dissipation performance of the second liquid cooling plate 13 on the battery module 2. Furthermore, the thermally conductive adhesive layer also has an adhesive effect, tightly bonding the battery module 2 and the second liquid cooling plate 13 together, improving the structural strength and stability of the battery pack and reducing loosening or damage caused by vibration or impact. The thermally conductive adhesive layer also has some cushioning properties, which can mitigate the impact of battery module 2 expansion on the second liquid cooling plate 13 to a certain extent.

[0062] In some embodiments, such as Figure 5 and Figure 6 As shown, the first liquid cooling plate 11 is provided with a first liquid inlet 111 and a first liquid outlet 112, which are respectively located on opposite sides of the first liquid cooling plate 11.

[0063] like Figure 5 and Figure 6 As shown, the first inlet 111 and the first outlet 112 are respectively located on opposite sides in the second direction X, facilitating the formation of a first flow channel 115 extending along the second direction X in the first liquid cooling plate 11. Coolant enters the first liquid cooling plate 11 through the first inlet 111, passes through the first flow channel 115, and then flows out through the first outlet 112 on the other side. This shortens the flow path of the coolant within the first liquid cooling plate 11, allowing it to flow through the plate more quickly and improving cooling efficiency. Simultaneously, the shorter flow path also reduces flow resistance, making the coolant flow more smoothly within the first liquid cooling plate 11 and further enhancing the cooling and heat dissipation effect.

[0064] In some embodiments, such as Figure 5 As shown, the first liquid cooling plate 11 includes multiple first flow channels 115, all of which extend along the second direction X. When the coolant, which has a lower temperature, enters the first liquid cooling plate 11 through the first inlet 111, it is dispersed into each of the first flow channels 115 to absorb the heat generated by the battery module 2, and then flows out from the first outlet 112 on the other side. Since the coolant does not need to circulate repeatedly within the first liquid cooling plate 11, the temperature uniformity throughout the first liquid cooling plate 11 is improved.

[0065] In some embodiments, such as Figure 7 As shown, the battery pack also includes a first liquid inlet pipe 113 and a first liquid outlet pipe 114. The first liquid inlet pipe 113 is connected to the first liquid inlet 111, and the first liquid outlet pipe 114 is connected to the first liquid outlet 112. The liquid inlet pipe and the liquid outlet pipe are located outside the receiving cavity, and both the liquid inlet pipe and the liquid outlet pipe are disposed on the side of the first liquid cooling plate 11 near the battery module 2.

[0066] like Figure 7 As shown, the first liquid inlet pipe 113 is connected to the first liquid inlet port 111, and the first liquid outlet pipe 114 is connected to the first liquid outlet port 112, facilitating the liquid inlet and outlet of the first liquid cooling plate 11. By placing the first liquid inlet pipe 113 and the first liquid outlet pipe 114 outside the receiving cavity, the convenience of connecting to external pipelines is improved. Furthermore, by placing both the first liquid inlet pipe 113 and the first liquid outlet pipe 114 on the side of the first liquid cooling plate 11 closer to the battery module 2, the risk of impact can be reduced, and the stability of the battery pack can be improved.

[0067] In some embodiments, such as Figure 8 As shown, the second liquid cooling plate 13 includes a second liquid inlet 131 and a second liquid outlet 132, which are located on the same side of the second liquid cooling plate 13. Coolant flows in from the second liquid inlet 131 and flows out from the second liquid outlet 132, thereby achieving coolant circulation. The second liquid cooling plate 13 includes multiple second flow channels, which can be connected end to end. Coolant flows out from the second liquid outlet 132 along the connected second flow channels to achieve heat dissipation.

[0068] like Figure 9 As shown, in the battery pack provided in this embodiment, the first liquid cooling plate 11, the frame structure 12, and the second liquid cooling plate 13 are arranged sequentially along the first direction Z and connected to form a whole. This forms a closed receiving cavity, in which the battery module 2, the integrated busbar 3, the insulating support 4, the thermally conductive buffer layer 5, and the thermally conductive layer 6 are all located.

[0069] Secondly, embodiments of this application also provide an energy storage device, including the battery pack described above. The energy storage device provided in the embodiments of this application has all the beneficial effects of the aforementioned battery pack, which will not be repeated here.

[0070] The embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A battery pack, characterized in that, include: The box has a receiving cavity; The battery module is disposed within the receiving cavity; An integrated busbar is disposed within the receiving cavity and connected to the battery module; A thermally conductive buffer layer is disposed within the receiving cavity and located on the side of the integrated busbar facing away from the battery module; the thermally conductive buffer layer includes a thermally conductive silicone layer.

2. The battery pack according to claim 1, characterized in that, The enclosure includes a first liquid cooling plate; The first liquid cooling plate is disposed on the side of the thermally conductive buffer layer away from the battery module.

3. The battery pack according to claim 2, characterized in that, An insulating support is provided on the side of the integrated busbar that is away from the battery module. The insulating support has a groove structure, and the thermally conductive buffer layer is located within the groove structure.

4. The battery pack according to claim 3, characterized in that, The integrated busbar includes multiple busbars, which are configured to connect two adjacent cells in the battery module; The groove structure includes multiple groove portions, and each groove portion is provided in a one-to-one correspondence with the busbar; The thermally conductive buffer layer includes multiple thermally conductive silicone pads, which are disposed within the groove and correspond one-to-one with the groove.

5. The battery pack according to claim 4, characterized in that, The groove is provided with a through hole, through which the thermally conductive silicone pad contacts the busbar.

6. The battery pack according to claim 2, characterized in that, The enclosure also includes a frame structure and a second liquid cooling plate, wherein the first liquid cooling plate and the second liquid cooling plate are respectively disposed on opposite sides of the frame structure in a first direction; The first liquid cooling plate and the second liquid cooling plate are respectively connected to the frame structure to form the housing, and the second liquid cooling plate is disposed on the side of the battery module away from the integrated busbar.

7. The battery pack according to claim 6, characterized in that, A heat-conducting layer is provided between the battery module and the second liquid cooling plate.

8. The battery pack according to claim 7, characterized in that, The thermally conductive layer includes a thermally conductive structural adhesive layer.

9. The battery pack according to any one of claims 2-8, characterized in that, The first liquid cooling plate is provided with a first liquid inlet and a first liquid outlet, which are respectively located on opposite sides of the first liquid cooling plate.

10. The battery pack according to claim 9, characterized in that, It also includes a first inlet pipe and a first outlet pipe; The first inlet pipe is connected to the first inlet port, and the first outlet pipe is connected to the first outlet port; The liquid inlet pipe and the liquid outlet pipe are located outside the receiving cavity, and both the liquid inlet pipe and the liquid outlet pipe are disposed on the side of the first liquid cooling plate near the battery module.

11. The battery pack according to claim 6 or 7, characterized in that, The second liquid cooling plate includes a second liquid inlet and a second liquid outlet, which are located on the same side of the second liquid cooling plate.

12. An energy storage device, characterized in that, Includes the battery pack as described in any one of claims 1-11.

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