Battery pack and electric device

Abstract

The utility model belongs to the technical field of power batteries, and discloses a battery pack and an electric device. The battery pack comprises a shell, an immersion assembly, a liquid cooling assembly and at least one battery pack, the shell is provided with at least one accommodating cavity along a first direction for accommodating at least one battery pack, the battery pack comprises a plurality of battery cells which are sequentially arranged along a second direction, every two adjacent battery cells are conductively connected through a busbar, and body parts of the battery cells are hermetically connected to the bottom walls of the accommodating cavities; the immersion assembly comprises an immersion cavity, the immersion cavity is formed in the bottom wall of the accommodating cavity, an immersion medium circulates in the immersion cavity, the body part of the battery cell covers the immersion cavity, and the busbar is inserted in the immersion cavity so as to be in heat exchange connection with the immersion medium; the liquid cooling assembly is arranged in the accommodating cavity, the liquid cooling assembly is used for being in heat exchange connection with at least one side of the battery pack, and heat exchange is performed on the busbar and the battery cell body in an immersion cooling and liquid cooling manner, so that the heat exchange effect is improved, and the weight is not increased greatly.

Description

Technical Field

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

[0002] To meet the current demands of electric vehicles for fast charging and high-power discharge, battery packs generally need to be equipped with a liquid-cooled thermal management system to achieve rapid cooling of the battery.

[0003] Currently, liquid cooling systems typically consist of liquid cooling plates and piping, which manage the thermal performance of individual cells within each battery pack through their arrangement. However, with the increasing demands for fast charging time and discharge power in battery packs, prolonged, high-rate charging and discharging operations are becoming more common. This leads to severe overheating of the busbars connecting the cells within a limited current-carrying area, limiting battery capacity. Liquid cooling systems primarily cool the cell bodies, requiring the cooling energy to be transferred to the busbars for further cooling. This results in insufficient heat dissipation from the busbars, leading to ineffective heat dissipation. Furthermore, placing the liquid cooling system on the busbar side may also result in inadequate or untimely cooling of the cell bodies. While immersion cooling is also an option for battery packs, it significantly increases weight and requires higher sealing standards.

[0004] Therefore, there is an urgent need for a battery pack and power supply device to solve the above-mentioned technical problems. Utility Model Content

[0005] One objective of this invention is to provide a battery pack that can exchange heat between the busbar and the cell body through immersion cooling and liquid cooling respectively, thereby improving the heat exchange effect without increasing the weight significantly.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] Battery pack, including:

[0008] The housing has at least one receiving cavity along the first direction;

[0009] At least one battery pack is disposed in at least one of the aforementioned receiving cavities. The battery pack includes a plurality of cells arranged sequentially along a second direction. Two adjacent cells are electrically connected through a busbar. The second direction is perpendicular to the first direction. The body of the cells is sealed to the bottom wall of the receiving cavity.

[0010] An immersion assembly includes an immersion chamber, which is formed in the bottom wall of the receiving cavity. The body portion of the battery cell is covered in the immersion chamber. An immersion medium flows through the immersion chamber. The busbar is inserted into the immersion chamber for heat exchange connection with the immersion medium.

[0011] A liquid cooling assembly is disposed within a receiving cavity and is used for heat exchange connection with at least one side of the battery pack.

[0012] Optionally, the immersion assembly further includes a first inlet pipe and a first outlet pipe, which are respectively connected to the two ends of the housing along the second direction. Both the first inlet pipe and the first outlet pipe are connected to the immersion chamber. The first inlet pipe is used for the inflow of the immersion medium, and the first outlet pipe is used for the outflow of the immersion medium.

[0013] Optionally, the immersion assembly further includes two first manifolds, which are respectively opened at both ends of the bottom wall of the housing along the second direction. One end of one of the two first manifolds is connected to the first inlet pipe and the other end is connected to the immersion chamber. One end of the other of the two first manifolds is connected to the first outlet pipe and the other end is connected to the immersion chamber.

[0014] Optionally, each of the aforementioned receiving cavities may have two immersion cavities.

[0015] Optionally, it also includes a sealing element disposed between the body portion of the battery cell and the cavity wall of the receiving cavity to form a sealed immersion cavity.

[0016] Optionally, the aforementioned receiving cavity has at least two side plates evenly distributed along the aforementioned first direction, the side plates are fitted to the side wall of the aforementioned battery cell along the aforementioned first direction, the aforementioned liquid cooling assembly includes at least two liquid cooling channels, the aforementioned liquid cooling channels are opened in the aforementioned side plates, and a heat exchange medium flows in the aforementioned liquid cooling channels.

[0017] Optionally, the liquid cooling assembly further includes a second inlet pipe and a second outlet pipe, which are respectively connected to the two ends of the housing along the second direction. Both the second inlet pipe and the second outlet pipe are connected to the liquid cooling channel. The second inlet pipe is used for the inflow of the heat exchange medium, and the second outlet pipe is used for the outflow of the heat exchange medium.

[0018] Optionally, the liquid cooling assembly further includes two second manifolds, which are disposed at both ends of the housing along the second direction. One end of one of the two second manifolds is connected to the second inlet pipe and the other end is connected to the liquid cooling channel; one end of the other of the two second manifolds is connected to the second outlet pipe and the other end is connected to the liquid cooling channel.

[0019] Optionally, a heat-conducting element is provided between any sidewall of the battery cell along the first direction and the corresponding side plate.

[0020] Another objective of this invention is to provide an electrical device comprising a battery pack as described in any of the above embodiments, which can exchange heat between the busbar and the battery cell body through immersion cooling and liquid cooling respectively, thereby improving the heat exchange effect without increasing the weight significantly.

[0021] The beneficial effects of this utility model are:

[0022] This invention provides a battery pack and electrical device. A liquid cooling assembly exchanges heat with the battery pack, and then an immersion assembly creates an immersion chamber on the bottom wall of the housing containing the battery pack. A busbar is inserted into the immersion chamber, achieving individual cooling of the busbar. Furthermore, the immersion chamber is sealed by a seal between the battery body and the bottom wall of the housing, ensuring that the immersion medium within the chamber only cools the busbar and does not flow to other parts of the battery, reducing the volume and weight occupied by the immersion medium. Thus, cooling of the battery cells and busbar is achieved without affecting other performance characteristics of the battery pack, thereby improving the charge and discharge performance of the battery pack. Attached Figure Description

[0023] Figure 1 This is a top view of the battery pack with the top cover hidden, provided in a specific embodiment of this utility model;

[0024] Figure 2 yes Figure 1 Cross-sectional view at point AA;

[0025] Figure 3 yes Figure 2 A magnified view of a section at point B in the middle;

[0026] Figure 4 This is a bottom view of the battery pack with the shell and top cover hidden, provided in a specific embodiment of this utility model;

[0027] Figure 5 yes Figure 4 A magnified view of a section at point C;

[0028] Figure 6 This is a top view of the housing provided in a specific embodiment of this utility model;

[0029] Figure 7 This is an isometric view of the battery pack with the top cover hidden, provided in a specific embodiment of this utility model;

[0030] Figure 8 yes Figure 7 A magnified view of a section at point D.

[0031] In the picture:

[0032] 10. Shell; 101. Receiving cavity; 11. Side plate; 12. Bottom plate; 13. End plate;

[0033] 20. Battery pack; 21. Battery cell; 211. Battery body; 212. Terminal post;

[0034] 30. Immersion assembly; 31. Immersion chamber; 32. First inlet pipe; 33. First outlet pipe; 34. First manifold;

[0035] 40. Liquid cooling assembly; 41. Liquid cooling channel; 42. Second inlet pipe; 43. Second outlet pipe; 44. Second manifold;

[0036] 50. Seals; 60. Manifolds. Detailed Implementation

[0037] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not the entire structure.

[0038] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0039] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0040] In the description of this embodiment, the terms "upper," "lower," "left," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0041] The following reference Figures 1 to 8 This invention introduces the battery pack and power supply device provided by this utility model.

[0042] It should be noted that the first direction in this embodiment is Figure 1 The X direction in the middle, the second direction is Figure 1 In the Y direction, both the first and second directions are horizontal. Figure 7 In this diagram, the Z direction is vertical, and the X, Y, and Z directions are all perpendicular to each other.

[0043] This embodiment provides a battery pack that can exchange heat between the busbar 60 and the cell 21 body through immersion cooling and liquid cooling, respectively, thereby improving the heat exchange effect without increasing the weight significantly.

[0044] Please refer to Figures 1 to 6 Specifically, the battery pack includes a housing 10, an immersion assembly 30, a liquid cooling assembly 40, and at least one battery pack 20. The housing 10 has at least one receiving cavity 101 along a first direction; at least one battery pack 20 is disposed in at least one receiving cavity 101, and the battery pack 20 includes a plurality of cells 21 arranged sequentially along a second direction. Adjacent cells 21 are electrically connected through a busbar 60. The second direction is perpendicular to the first direction. The body portion 211 of the cell 21 is sealed to the bottom wall of the receiving cavity 101. The immersion assembly 30 includes an immersion cavity 31, which is opened in the bottom wall of the receiving cavity 101. An immersion medium flows through the immersion cavity 31. The body portion 211 of the cell 21 covers the immersion cavity 31. The busbar 60 is inserted into the immersion cavity 31 for heat exchange connection with the immersion medium. The liquid cooling assembly 40 is disposed in the receiving cavity 101 and is used for heat exchange connection with at least one side of the battery pack 20.

[0045] In this embodiment, the battery pack uses a liquid cooling assembly 40 to exchange heat with the battery pack 20. Then, an immersion assembly 30 creates an immersion cavity 31 on the bottom wall of the receiving cavity 101 containing the battery pack 20, and a busbar 60 is inserted into the immersion cavity 31, achieving separate cooling of the busbar 60. Furthermore, the immersion cavity 31 is sealed by the seal between the battery body 211 and the bottom wall of the receiving cavity 101, ensuring that the immersion medium within the immersion cavity 31 only cools the busbar 60 and does not flow to other parts of the battery, reducing the volume and weight occupied by the immersion medium. Thus, cooling of the battery cells 21 and the busbar 60 is achieved without affecting other performance characteristics of the battery pack, thereby improving the charge and discharge performance of the battery pack.

[0046] Please refer to Figure 6 and Figure 7 In this embodiment, the housing 10 includes a bottom plate 12, at least two side plates 11 and two end plates 13. The at least two side plates 11 are spaced apart on the bottom plate 12 along a first direction, and the two end plates 13 are disposed at both ends of the bottom plate 12 along a second direction to form at least one receiving cavity 101.

[0047] Optionally, the housing 10 can be formed by welding multiple sheet metal parts, die casting, or extruding aluminum profiles, all of which can form the housing 10 for accommodating the battery pack 20. For example, in this embodiment, the housing 10 is formed by extruding aluminum profiles, which facilitates the arrangement of the immersion assembly 30 and the liquid cooling assembly 40. Specifically, the immersion assembly 30 and the liquid cooling assembly 40 are integrated onto the aluminum profile extruded housing 10, further simplifying the complexity of the component structure and reducing the weight of the battery pack.

[0048] Please refer to Figure 3 , Figure 4 and Figure 6 Furthermore, in this embodiment, the battery cell 21 is inverted so that the busbar 60 can be inserted into the immersion cavity 31.

[0049] Optionally, the battery cell 21 in this embodiment is a square battery cell 21, which includes a body portion 211 and two terminals 212, the two terminals 212 being arranged on the same side and having opposite polarities. Adjacent battery cells 21 are electrically connected through two busbars 60, so that each battery pack 20 has two sets of busbars 60 arranged on the terminal 212 side. Therefore, optionally, each receiving cavity 101 has two immersion chambers 31 to correspond to the cooling of the two sets of busbars 60.

[0050] Furthermore, the immersion assembly 30 is formed on the base plate 12, and the top wall of the portion of the base plate 12 on which the battery pack 20 is mounted is removed, thus forming the immersion chamber 31 in the cavity above the base plate 12.

[0051] Of course, the base plate 12 has at least two rows of cavities along the Z direction. The cavity near the receiving cavity 101 is used to form the immersion cavity 31. The arrangement of multiple rows of cavities can not only improve the structural strength of the base plate 12, but also prevent the bottom of the battery pack from being damaged by external impacts such as stone impacts, thus avoiding leakage of the immersion medium and causing pollution to the electrical device.

[0052] Optionally, the immersion medium can be an insulating immersion coolant to ensure insulation between the terminals 212 of the cells 21. For example, an oil-based coolant is selected as the immersion medium, as it has good insulating properties.

[0053] Please refer to Figure 1 , Figures 6 to 8 Specifically, the immersion assembly 30 also includes a first inlet pipe 32 and a first outlet pipe 33. The first inlet pipe 32 and the first outlet pipe 33 are respectively connected to the two ends of the housing 10 along the second direction. The first inlet pipe 32 and the first outlet pipe 33 are both connected to the immersion chamber 31. The first inlet pipe 32 is used for the inflow of the immersion medium, and the first outlet pipe 33 is used for the outflow of the immersion medium, so that the immersion medium circulates in the immersion chamber 31.

[0054] More specifically, the first inlet pipe 32 and the first outlet pipe 33 are respectively sealed and connected to the two end plates 13 to facilitate connection with the external plug-in end.

[0055] Optionally, the immersion assembly 30 further includes two first manifolds 34, which are respectively opened at both ends of the bottom wall of the housing 10 along the second direction. One end of one of the two first manifolds 34 is connected to the first inlet pipe 32, and the other end is connected to the immersion chamber 31; one end of the other of the two first manifolds 34 is connected to the first outlet pipe 33, and the other end is connected to the immersion chamber 31. The first manifolds 34 are used to connect the first inlet pipe 32 and the immersion chamber 31 or to connect the first outlet pipe 33 and the immersion chamber 31, so as to realize the supply and discharge of the immersion medium in the immersion chamber 31.

[0056] Specifically, the connection between the first inlet pipe 32 and the first manifold 34, as well as the connection between the first outlet pipe 33 and the first manifold 34, can be achieved through the cavity corresponding to the end plate 13, connected via the connection point between the end plate 13 and the bottom plate 12, thereby realizing the connection between the first inlet pipe 32 and the first manifold 34, and the connection between the first outlet pipe 33 and the first manifold 34. Of course, in other embodiments, the connection between the first inlet pipe 32 and the first manifold 34, and the connection between the first outlet pipe 33 and the first manifold 34, can also be achieved by providing corresponding pipelines, which is not specifically limited here.

[0057] Please refer to Figure 5Specifically, the battery pack also includes a seal 50, which is disposed between the body portion 211 of the cell 21 and the cavity wall of the receiving cavity 101 to form a sealed immersion cavity 31. Optionally, the seal 50 may be a sealing strip or a sealant, etc., and is not specifically limited here.

[0058] In this embodiment, the liquid cooling component 40 can be in the form of a liquid cooling plate and piping, or it can be directly integrated into the housing 10; no specific limitation is made here. For example, in this embodiment, the liquid cooling component 40 is integrated into the housing 10.

[0059] Please refer to Figure 1 and Figure 3 Specifically, the receiving cavity 101 has at least two side plates 11 evenly distributed along the first direction. The side plates 11 are attached to the side wall of the battery cell 21 along the first direction. The liquid cooling assembly 40 includes at least two liquid cooling channels 41. The liquid cooling channels 41 are opened in the side plates 11. A heat exchange medium flows in the liquid cooling channels 41 to achieve heat exchange on the side wall of the battery cell 21. This not only improves the structural strength of the housing 10, but also integrates the liquid cooling assembly 40 into the housing 10, reducing the number of parts and the weight of the battery pack.

[0060] Of course, the two outermost side plates 11 are provided with at least two rows of cavities along the first direction, and the cavity near the receiving cavity 101 is used to form the liquid cooling channel 41. The arrangement of multiple rows of cavities can not only improve the structural strength of the side plates 11, but also play a certain buffering role when the side of the battery pack is impacted, so as to avoid squeezing and damaging the liquid cooling channel 41, thereby avoiding the leakage of heat exchange medium and causing pollution to the electrical device.

[0061] Alternatively, a commonly used coolant can be used as the heat exchange medium. For example, water + ethylene glycol can be used as the heat exchange medium, which has excellent low-temperature performance and corrosion resistance, and is relatively inexpensive.

[0062] Please refer to Figure 1 , Figure 6 and Figure 8 Specifically, the liquid cooling assembly 40 also includes a second inlet pipe 42 and a second outlet pipe 43. The second inlet pipe 42 and the second outlet pipe 43 are respectively connected to the two ends of the housing 10 along the second direction. The second inlet pipe 42 and the second outlet pipe 43 are both connected to the liquid cooling channel 41. The second inlet pipe 42 is used for the inflow of heat exchange medium, and the second outlet pipe 43 is used for the outflow of heat exchange medium, so that heat exchange medium circulates in the liquid cooling channel 41.

[0063] More specifically, the second inlet pipe 42 and the second outlet pipe 43 are respectively sealed and connected to the two end plates 13 to facilitate connection with the external plug-in end.

[0064] Optionally, the liquid cooling assembly 40 further includes two second manifolds 44. One end of one of the two second manifolds 44 is connected to the second inlet pipe 42, and the other end is connected to the liquid cooling channel 41; one end of the other of the two second manifolds 44 is connected to the second outlet pipe 43, and the other end is connected to the liquid cooling channel 41. The second manifolds 44 are used to connect the second inlet pipe 42 and the liquid cooling channel 41 or to connect the second outlet pipe 43 and the liquid cooling channel 41, so as to supply and discharge the heat exchange medium in the liquid cooling channel 41.

[0065] Specifically, the connection between the second inlet pipe 42 and the second manifold 44, as well as the connection between the second outlet pipe 43 and the second manifold 44, can be achieved through the connection of the cavity corresponding to the end plate 13, the end plate 13, and the side plate 11. Of course, the connection between the second inlet pipe 42 and the second manifold 44, as well as the connection between the second outlet pipe 43 and the second manifold 44, can also be achieved by setting corresponding pipelines, which is not specifically limited here.

[0066] For example, in this embodiment, the outer side plate 11 and the end plate 13 are connected by a cavity, while the inner side plate 11 is connected to the liquid cooling channel 41 in the outermost side plate 11 by a connecting pipe. A second manifold 44 is formed in the connecting pipe to realize the supply and discharge of heat exchange medium in each liquid cooling channel 41.

[0067] Specifically, a heat-conducting element (not shown in the figure) is provided between any side wall of the battery cell 21 along the first direction and the corresponding side plate 11 to improve the heat exchange effect between any side wall of the battery cell 21 along the first direction and the corresponding liquid cooling channel, thereby improving the heat exchange effect of the liquid cooling assembly 40 on the battery cell 21.

[0068] This embodiment also provides an electrical device that includes the battery pack described in any of the above-described solutions. Specifically, this electrical device can be an electric vehicle, a hybrid electric vehicle, an electric ship, an electric bicycle, an energy storage device, etc., as long as it uses the aforementioned battery pack for power supply or energy storage; no specific limitations are imposed here.

[0069] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A battery pack, characterized in that, include: The housing has at least one receiving cavity along the first direction; At least one battery pack is disposed in at least one of the receiving cavities. The battery pack includes a plurality of cells arranged sequentially along a second direction. Two adjacent cells are electrically connected through a busbar. The second direction is perpendicular to the first direction. The body of the cell is sealed to the bottom wall of the receiving cavity. An immersion assembly includes an immersion chamber, which is formed in the bottom wall of the receiving cavity. An immersion medium flows through the immersion chamber. The body of the battery cell is covered in the immersion chamber. A busbar is inserted into the immersion chamber for heat exchange connection with the immersion medium. A liquid cooling assembly is disposed within a receiving cavity and is used for heat exchange connection with at least one side of the battery pack.

2. The battery pack according to claim 1, characterized in that, The immersion assembly further includes a first inlet pipe and a first outlet pipe, which are respectively connected to the two ends of the housing along the second direction. Both the first inlet pipe and the first outlet pipe are connected to the immersion chamber. The first inlet pipe is used for the inflow of the immersion medium, and the first outlet pipe is used for the outflow of the immersion medium.

3. The battery pack according to claim 2, characterized in that, The immersion assembly further includes two first manifolds, which are respectively opened at both ends of the bottom wall of the housing along the second direction. One end of one of the two first manifolds is connected to the first inlet pipe, and the other end is connected to the immersion chamber. One end of the other of the two first manifolds is connected to the first outlet pipe, and the other end is connected to the immersion chamber.

4. The battery pack according to claim 1, characterized in that, Each of the aforementioned receiving cavities has two immersion cavities.

5. The battery pack according to claim 1, characterized in that, It also includes a sealing element disposed between the body portion of the battery cell and the cavity wall of the receiving cavity to form a sealed immersion cavity.

6. The battery pack according to any one of claims 1-5, characterized in that, The receiving cavity has at least two side plates evenly distributed along the first direction. The side plates are attached to the side wall of the battery cell along the first direction. The liquid cooling assembly includes at least two liquid cooling channels, which are opened in the side plates and contain heat exchange medium.

7. The battery pack according to claim 6, characterized in that, The liquid cooling assembly further includes a second inlet pipe and a second outlet pipe, which are respectively connected to the two ends of the housing along the second direction. Both the second inlet pipe and the second outlet pipe are connected to the liquid cooling channel. The second inlet pipe is used for the inflow of the heat exchange medium, and the second outlet pipe is used for the outflow of the heat exchange medium.

8. The battery pack according to claim 7, characterized in that, The liquid cooling assembly further includes two second manifolds, which are disposed at both ends of the housing along the second direction. One end of one of the two second manifolds is connected to the second inlet pipe, and the other end is connected to the liquid cooling channel. One end of the other of the two second manifolds is connected to the second outlet pipe, and the other end is connected to the liquid cooling channel.

9. The battery pack according to claim 6, characterized in that, A heat-conducting element is provided between any sidewall of the battery cell along the first direction and the corresponding side plate.

10. An electrical appliance, characterized in that, Includes the battery pack as described in any one of claims 1-9.

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