A battery pack

Abstract

This application discloses a battery pack, including: a housing, a battery pack, and a top cover assembly; the housing has a receiving cavity with an opening and a bottom wall opposite to each other, the battery pack is disposed in the receiving cavity and connected to the bottom wall, and the top cover assembly is connected to the housing and covers the opening; the top cover assembly has a cooling cavity filled with a phase change material, which can undergo a phase change to absorb the heat generated by the battery pack. This allows the heat absorption characteristic of the phase change material during the phase change process to be utilized, enabling the phase change material to continuously absorb the heat from the battery pack during operation, thereby effectively slowing down the temperature rise rate of the battery pack and supporting faster charging at higher power; simultaneously, integrating the cooling cavity into the top cover assembly reduces the space occupied by the cooling system within the battery pack, significantly improving the integration of the battery pack.

Description

Technical Field

[0001] This application belongs to the field of battery technology, specifically relating to a battery pack. Background Technology

[0002] One factor limiting battery charging speed is battery temperature rise. Under high-power charging conditions, the battery pack generates a significant amount of heat, causing its temperature to rise rapidly. If this heat cannot be dissipated quickly, charging time cannot be further reduced. Currently, the industry primarily uses liquid cooling solutions to cool the battery pack and control its temperature during charging.

[0003] In related technologies, to improve the heat dissipation capacity of the battery pack, a liquid cooling plate is usually installed on top of the battery pack. However, installing a liquid cooling plate on top occupies space in the battery pack and also makes the battery pack structure more complex and has a lower integration level. Utility Model Content

[0004] This application aims to provide a battery pack that can solve the problems of complex structure, low integration, and space occupation of cooling components in the prior art.

[0005] To solve the above-mentioned technical problems, this application is implemented as follows:

[0006] This application provides a battery pack comprising: a housing, a battery pack, and a top cover assembly; the housing has a receiving cavity having an opening and a bottom wall disposed opposite to each other, the battery pack being disposed within the receiving cavity and connected to the bottom wall, and the top cover assembly being connected to the housing and covering the opening; the top cover assembly has a cooling cavity filled with a phase change material capable of undergoing a phase change to absorb the heat generated by the battery pack.

[0007] Optionally, the top cover assembly is thermally connected to the battery pack, and the top cover assembly is provided with a plurality of cooling chambers, which are spaced apart, and at least one of the cooling chambers is in contact with the battery pack.

[0008] Optionally, the battery pack has a first direction and a second direction that are perpendicular to each other, the battery pack includes a plurality of cell rows spaced apart along the first direction, each cell row includes a plurality of cells spaced apart along the second direction, and each cooling cavity corresponds to one of the cell rows.

[0009] Optionally, the top cover assembly includes a top cover body and a cover plate; the top cover body is disposed at the cavity opening, the top cover body is thermally connected to the battery pack, a cooling groove is provided on the side of the top cover body away from the cavity opening, and a slot is provided on the side of the cooling groove away from the cavity opening; the cover plate is connected to the top cover body, and the cover plate is at least disposed at the slot to form the cooling cavity, and the cooling cavity is in contact with the battery pack.

[0010] Optionally, the top cover assembly further includes a protrusion; the cooling groove also has a bottom wall disposed opposite to the groove opening; the bottom wall of the groove is provided with a plurality of spaced protrusions on the side near the cover plate, the plurality of protrusions dividing the cooling groove into a plurality of sub-grooves, at least a portion of the sub-grooves being provided with the phase change material.

[0011] Optionally, the multiple sub-grooves are interconnected.

[0012] Optionally, the battery pack includes multiple cell rows, each cell row comprising multiple cells stacked sequentially; the extension direction of the sub-groove is the same as the stacking direction of the multiple cells.

[0013] Optionally, it also includes a heat-conducting component; the heat-conducting component is disposed between the battery pack and the top cover assembly, and the heat-conducting component is thermally connected to the battery pack and the top cover assembly respectively.

[0014] Optionally, the heat-conducting component has a positioning groove at a position corresponding to the cooling cavity, and the portion of the top cover assembly having the cooling cavity is embedded in the positioning groove.

[0015] Optionally, the battery pack further includes multiple battery cells and multiple busbars; the multiple battery cells are stacked in the receiving cavity, and the busbars are provided between two adjacent battery cells, and the two adjacent battery cells are electrically connected through the busbars;

[0016] The heat-conducting component has a groove at a position corresponding to the busbar, and the busbar is at least partially embedded in the groove.

[0017] In the embodiments of this application, the battery pack is disposed within the housing cavity, and a top cover assembly is connected to the housing and covers the cavity opening. A cooling cavity is provided in the top cover assembly, and the cooling cavity is filled with phase change material. This allows the heat absorption property of the phase change material during phase change to be utilized. During battery pack operation, the phase change material continuously absorbs heat from the battery pack through phase change, effectively slowing down the rate of temperature rise in the battery pack and thus supporting faster charging at higher power. Simultaneously, integrating the cooling cavity into the top cover assembly reduces the space occupied by the cooling system within the battery pack, significantly improving the integration of the battery pack.

[0018] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0019] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0020] Figure 1 This is an exploded view of a battery pack according to an embodiment of this application;

[0021] Figure 2 This is a partial cross-sectional view of a battery pack according to an embodiment of this application;

[0022] Figure 3 This is a partial top view of the top cover body according to an embodiment of this application;

[0023] Figure 4 This is a partial enlarged view of the top cover body according to an embodiment of this application;

[0024] Figure 5 This is a schematic diagram of a heat-conducting component according to an embodiment of this application.

[0025] Figure label:

[0026] 1-Shell; 2-Battery pack; 21-Battery cell; 22-Busbar; 3-Top cover assembly; 31-Top cover body; 32-Cover plate; 33-Protrusion; 34-Cooling cavity; 4-Cooling groove; 41-Sub-groove; 5-Heat conductive component; 51-Positioning groove; 52-Groove; 53-Protrusion; 6-Fast charging interface; 7-High voltage output port; 8-Communication interface; 9-Water inlet; 10-Water outlet; X-First direction; Y-Second direction. Detailed Implementation

[0027] The embodiments of this application will now be described in detail. Examples of these embodiments are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0028] The terms "first" and "second" in the specification and claims of this application may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise stated, "multiple" means two or more. Furthermore, "and / or" in the specification and claims indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0029] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, 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, and therefore should not be construed as a limitation of this application.

[0030] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0031] The current pain points in the electric vehicle industry are concentrated on range and supercharging capabilities. Numerous problems arise when developing large-capacity super-fast charging products. For example, large capacity requires high volumetric energy density, while super-fast charging necessitates enhanced thermal management. To improve heat dissipation, the cooling area of ​​the battery cells is typically increased, leading to a higher number of cooling plates, increased space requirements, increased battery pack complexity, and increased number, types, and costs of components. Furthermore, supercharging causes significant temperature rises and differences in the battery cells within the pack. Especially with a large number of cells, large temperature differences can lead to decreased cell lifespan and a reduced overall battery pack lifespan.

[0032] The battery pack provided in this application will be described in detail below with reference to the accompanying drawings, through specific embodiments and application scenarios.

[0033] This application provides a battery pack comprising: a housing 1, a battery pack 2, and a top cover assembly 3; the housing 1 has a receiving cavity with an opening and a bottom wall disposed opposite to each other, the battery pack 2 is disposed in the receiving cavity and connected to the bottom wall, and the top cover assembly 3 is connected to the housing 1 and covers the opening; the top cover assembly 3 has a cooling cavity 34 filled with a phase change material, which can undergo a phase change to absorb the heat generated by the battery pack 2.

[0034] In this embodiment, the battery pack 2 is housed within the cavity of the housing 1, and the top cover assembly 3 is connected to the housing 1 and covers the cavity opening. A cooling cavity 34 is provided in the top cover assembly 3, and the cooling cavity 34 is filled with a phase change material. This allows the phase change material to absorb heat during phase change, effectively slowing down the rate of temperature rise and supporting faster charging at higher power. Simultaneously, integrating the cooling cavity 34 into the top cover assembly 3 reduces the space occupied by the cooling system within the battery pack, significantly improving the integration of the battery pack.

[0035] Furthermore, the top cover assembly 3, being in direct contact with the external environment, can rapidly conduct heat to the outside of the battery pack through the phase change material, forming a dual thermal management path of "internal heat absorption - top cover heat dissipation," thereby improving overall heat dissipation efficiency. Moreover, compared to existing technologies, it reduces the complexity of the cooling system's piping and auxiliary equipment, lowering the overall weight and production cost of the battery pack, and reducing the maintenance requirements of the cooling system. Simultaneously, by placing the cooling chamber 34 outside the battery pack, it prevents leakage of the phase change material from entering the battery pack, further ensuring the battery pack's safety performance.

[0036] As can be understood, phase change materials refer to substances that change their state of matter and provide latent heat while maintaining a constant temperature. The process of changing physical properties is called a phase change process, during which the phase change material absorbs or releases a large amount of latent heat.

[0037] For example, the phase change material can be sodium sulfate decahydrate, graphene, metal foam, etc., and the embodiments of this application are not limited thereto.

[0038] It is understandable that if the initial state of the phase change material is solid, it changes from solid to liquid after absorbing heat. Driven by thermal convection, the liquid phase change material flows, thereby absorbing heat for battery pack 2.

[0039] In some embodiments, the relationship between the heat generated by the battery pack 2 and the amount of phase change material used is as follows: When the battery pack 2 reaches its upper limit temperature during charging, the heat generated is Q, and the charging time at this point is T. After using the phase change material, the heat absorbed by the phase change material is Q1, which must satisfy Q1≥Q. The heat absorbed by the phase change material is Q1=m*L, where m is the mass of the phase change material in g; L is the latent heat of phase change of the phase change material, i.e., the heat that the phase change material can absorb or release per unit mass, in J / g. The volume of phase change material that can be stored in the top cover assembly is V, thus Q1=V / ρ*L, where ρ is the density of the phase change material. After using the top cover assembly of this application, the charging time of the battery pack 2 is T1. Subtracting T from T1 gives ΔT. That is, the top cover assembly 3 of this application can reduce the charging time by ΔT.

[0040] In specific applications, the battery pack can be at least one of lithium-ion battery packs, solid-state battery packs, lead-acid battery packs, and nickel-metal hydride battery packs. Those skilled in the art can choose according to actual needs, and this application does not impose any restrictions on this.

[0041] Optionally, such as Figure 1 As shown, the top cover assembly 3 is thermally connected to the battery pack 2, and the top cover assembly 3 is provided with multiple cooling chambers 34, which are spaced apart.

[0042] In this embodiment, multiple cooling chambers 34 are provided in the top cover assembly 3, and the multiple cooling chambers 34 are spaced apart. In this way, the spaced cooling chambers 34 can perform targeted heat dissipation for different areas of the battery pack 2, avoiding heat accumulation and the risk of thermal runaway. In addition, the multiple cooling chambers 34 can work independently or work together to dissipate heat, and the heat dissipation intensity can be dynamically adjusted according to the temperature gradient distribution of the battery pack 2 to achieve overall temperature balance of the battery pack.

[0043] It should be noted that thermally conductive connection refers to establishing an effective heat conduction path between battery pack 2 and top cover assembly 3, so that the heat of battery pack 2 can be transferred to the phase change material in cooling cavity 34. Thermally conductive connection can be formed by direct contact between battery pack 2 and top cover assembly 3, or it can be formed indirectly through other thermally conductive media.

[0044] Optionally, such as Figure 1 and Figure 2 As shown, the battery pack has a first direction X and a second direction Y that are perpendicular to each other. The battery pack 2 includes a plurality of cell rows 23 spaced apart along the first direction X. Each cell row 23 includes a plurality of cells 21 spaced apart along the second direction Y. Each cooling cavity 34 corresponds to one cell row 23.

[0045] It is understandable that the first direction X is the width direction of the battery pack, and the second direction Y is the length direction of the battery pack.

[0046] In this embodiment, multiple cell rows 23 are arranged at intervals along a first direction X, and multiple cells 21 are arranged at intervals along a second direction Y in each cell row 23. Each cooling cavity 34 corresponds to one cell row 23. This allows the heat from each cell row 23 to be directly conducted to the corresponding cooling cavity 34, thereby reducing the length of the heat transfer path and improving the heat absorption efficiency of the phase change material.

[0047] In some embodiments, such as Figure 1 As shown, the battery cell arrays 23 are spaced apart along the first direction X, and the corresponding cooling chambers 34 are also spaced apart along the first direction X. Of course, multiple cooling chambers 34 can also be spaced apart along the second direction Y, and this embodiment does not limit this.

[0048] Optionally, such as Figure 1 and Figure 2 As shown, the top cover assembly 3 includes a top cover body 31 and a cover plate 32; the top cover body 31 is thermally connected to the battery pack 2, the top cover body 31 is placed at the cavity opening, the top cover body 31 is provided with a cooling groove 4 on the side away from the cavity opening, the cooling groove 4 is provided with a slot on the side away from the cavity opening, and the cover plate 32 is connected to the top cover body 31, and the cover plate 32 is at least placed at the slot opening to form a cooling cavity 34.

[0049] In this embodiment, the top cover body 31 is placed over the cavity opening, and the cover plate 32 is connected to the top cover body 31 and placed over the groove. This separate design of the cover plate 32 and the top cover body 31 facilitates manufacturing and maintenance.

[0050] Specifically, when the phase change material in the top cover assembly 3 leaks, the cover plate 32 where the phase change material leaks can be removed and replaced separately, thus avoiding the need to disassemble the entire top cover assembly 3 and reducing maintenance costs. Furthermore, the split design allows for flexible adjustment of the size or number of cooling chambers 34 to accommodate different battery pack models, improving production compatibility.

[0051] In some embodiments, to improve the sealing between the cover plate 32 and the top cover body 31, welding, adhesive bonding, or other methods with good sealing properties can be used to connect the cover plate 32 and the top cover body 31.

[0052] Optionally, such as Figures 2 to 4 As shown, the top cover assembly 3 also includes a protrusion 33, and the cooling tank 4 also has a bottom wall disposed opposite to the opening of the tank; the bottom wall of the tank is provided with a plurality of spaced protrusions 33 on the side near the cover plate 32, and the plurality of protrusions 33 divide the cooling tank 4 into a plurality of sub-grooves 41, at least some of the sub-grooves 41 are provided with phase change material.

[0053] In this embodiment, by providing multiple spaced protrusions 33 at the bottom of the cooling tank, the cooling tank 4 is divided into multiple sub-grooves 41, some of which are provided with phase change material. This allows for localized temperature control of the battery cell array 23 by covering the surface of the battery cell array 23 with multiple sub-grooves 41, thereby precisely controlling heat dissipation. Simultaneously, the protrusions 33 themselves increase the surface area, promoting heat conduction. Furthermore, the spaced protrusions 33 act as reinforcing ribs, improving the mechanical strength of the top cover assembly 3.

[0054] In some embodiments, phase change material may be provided in all sub-grooves 41 or in some sub-grooves 41. This application embodiment does not impose any limitations on this.

[0055] Furthermore, this application does not limit the number and shape of the sub-grooves 41; for example, each cooling groove 4 is provided with four sub-grooves 41, and the sub-grooves 41 are set in a straight line.

[0056] Optionally, such as Figure 3 As shown, multiple sub-grooves 41 are interconnected.

[0057] In this embodiment, multiple sub-grooves 41 are interconnected. This facilitates the flow of phase change material within the sub-grooves 41, reduces localized hot spots in the battery pack 2, and makes heat dissipation in the battery pack 2 more uniform. Furthermore, the interconnection of the sub-grooves 41 allows...

[0058] Specifically, such as Figure 3 As shown, multiple sub-grooves 41 are connected end-to-end as indicated by the arrows to form a flow channel, making it easier for the heat of the battery pack 2 to be transferred along the flow channel and improving the uniformity of heat dissipation. Of course, multiple connecting holes can be provided in the protrusion 33, and two adjacent sub-grooves 41 can be connected through the connecting holes.

[0059] Optionally, such as Figure 1 and Figure 3 As shown, the battery pack 2 includes multiple cell rows 23, and each cell row 23 includes multiple cells 21 stacked sequentially; the extension direction of the sub-groove 41 is the same as the stacking direction of the multiple cells 21.

[0060] In this embodiment, the extension direction of the sub-groove 41 is set to be the same as the stacking direction of the multiple battery cells 21. In this way, one sub-groove 41 can cover multiple battery cells 21, so that the heat generated by the multiple battery cells 21 in each battery cell row 23 is directly introduced into the phase change material of the corresponding sub-groove 41, thereby improving the heat dissipation efficiency.

[0061] It is understandable that multiple cell rows 23 can be arranged at intervals along the first direction X, and multiple cells 21 in each cell row 23 can be arranged along the second direction Y, and the corresponding sub-grooves 41 can also extend along the second direction Y; of course, the extension direction of the sub-grooves 41 can also intersect with the stacking direction of the multiple cells 21; for example, multiple cells 21 are arranged along the second direction Y, and the sub-grooves 41 extend along the first direction X.

[0062] Of course, multiple cell rows 23 can be arranged at intervals along the second direction Y, and multiple cells 21 in each cell row 23 can be arranged along the first direction X, and the corresponding sub-grooves 41 can also extend along the first direction X; of course, the extension direction of the sub-grooves 41 can also intersect with the stacking direction of the multiple cells 21; for example, multiple cells 21 are arranged along the first direction X, and the sub-grooves 41 extend along the second direction Y.

[0063] Optionally, such as Figure 1 As shown, it also includes a heat-conducting component 5; the heat-conducting component 5 is disposed between the battery pack 2 and the top cover assembly 3, and the heat-conducting component 5 is thermally connected to the battery pack 2 and the top cover assembly 3 respectively.

[0064] In this embodiment, a heat-conducting element 5 is provided between the battery pack 2 and the top cover assembly 3. This reduces the thermal resistance between the battery pack 2 and the top cover assembly 3, allowing the battery pack 2 to better transfer heat to the phase change material located in the cooling cavity 34 via the heat-conducting element 5, thereby improving heat dissipation efficiency. Furthermore, the heat-conducting element 5 can also improve the modal characteristics of the battery pack, preventing resonance during vehicle operation and avoiding structural damage and abnormal noises.

[0065] In some embodiments, the thermally conductive component 5 may include at least one of thermally conductive structural adhesive, thermally conductive foam, and thermally conductive silicone.

[0066] Optionally, such as Figure 1 , Figure 2 and Figure 5 As shown, the heat-conducting component 5 has a positioning groove 51 at a position corresponding to the cooling cavity 34, and the part of the top cover assembly 3 that has the cooling cavity 34 is embedded in the positioning groove 51.

[0067] In this embodiment, the portion of the top cover assembly 3 containing the cooling cavity 34 is embedded within the positioning groove 51. This allows the positioning groove 51 to serve as a positional reference for the portion of the top cover assembly 3 containing the cooling cavity 34, ensuring precise alignment between the heat-conducting component 5 and the cooling cavity 34, thereby reducing contact thermal resistance and improving heat dissipation efficiency. Furthermore, it simplifies the assembly process, reduces costs, and enhances the overall structural stability.

[0068] In addition, by embedding the top cover assembly 3 with the cooling cavity 34 into the positioning groove 51 of the heat-conducting component 5, a three-dimensional nested heat conduction channel is formed, so that the heat of the battery pack 2 can be directly transferred from the side wall of the positioning groove 51 to the phase change material in the cooling cavity 34, thereby achieving the shortest heat flow path and improving heat conduction efficiency.

[0069] In some embodiments, when there are multiple cooling chambers 34, there may also be multiple positioning slots 51, with each cooling chamber 34 located in a corresponding positioning slot 51.

[0070] Optionally, such as Figure 1 , Figure 2 and Figure 5 As shown, the battery pack 2 also includes multiple battery cells 21 and multiple busbars 22; the multiple battery cells 21 are stacked in the receiving cavity, and a busbar 22 is provided between two adjacent battery cells 21, and the two adjacent battery cells 21 are electrically connected through the busbar 22; the heat-conducting component 5 is provided with a groove 52 at a position corresponding to the busbar 22, and the busbar 22 is at least partially embedded in the groove 52.

[0071] In this embodiment, multiple battery cells 21 are stacked and arranged in a receiving cavity, with adjacent battery cells 21 electrically connected via a busbar 22. The heat-conducting component 5 has a groove 52 at a position corresponding to the busbar 22, and the busbar 22 is at least partially embedded within the groove 52. This allows the groove 52 to serve as a positional reference for the busbar 22, ensuring precise alignment between the busbar 22 and the groove 52, thereby reducing contact thermal resistance and improving heat dissipation efficiency. Furthermore, the heat generated by the busbar 22 is directly transferred to the heat-conducting component 5 through the sidewall of the groove 52, eliminating air gap thermal resistance and significantly improving heat dissipation efficiency under high current conditions.

[0072] In some embodiments, multiple busbars 22 are configured, arranged in a row along the length of the battery pack, with each busbar 22 spaced apart along the width of the battery pack. The extending direction of the groove 52 is the same as the extending direction of each busbar 22. In this way, each busbar 22 can be disposed in a groove 52, thereby facilitating installation and positioning.

[0073] In some embodiments, such as Figure 5 As shown, the heat-conducting component 5 is also provided with a protrusion 53, which corresponds to the groove 52, and a positioning groove 51 is provided between the two protrusions 53. The protrusion 53 is used to fit and contact with the cover plate 32.

[0074] In some embodiments, the heat-conducting component 5 and the battery pack 2 not only meet the heat exchange requirements but also the assembly and compression functions. To accommodate the assembly requirements, the gap between the sidewall of the groove 52 and the busbar 22 along the width direction of the battery pack can be set between 0mm and 2mm, which can ensure assembly while maintaining a large heat exchange area. To accommodate the compression requirements, the maximum thickness of the heat-conducting component 5 along the height direction of the battery pack before compression is t, and the thickness after compression is 0.5t to t. This can ensure a certain compression performance while maintaining a tight fit with the cover plate 32, and also improve the overall rigidity and modal characteristics of the battery pack.

[0075] It should be noted that the maximum thickness of the pre-compression heat-conducting component 5 along the height direction of the battery pack is t, which is the sum of the depth of the groove 52 along the height direction of the battery pack and the thickness of the protrusion 53 along the height direction of the battery pack.

[0076] The depth of the groove 52 along the height of the battery pack is equal to the sum of the height of the busbar along the height of the battery pack and the height of the terminal post of the cell 21 along the height of the battery pack. Generally speaking, the depth of the groove 52 along the height of the battery pack is between 1mm and 6mm, which satisfies the current requirements of the cell and allows the heat-conducting component 5 to fit tightly with the cover plate 32.

[0077] In some embodiments, such as Figure 1 As shown, the battery pack also includes a fast charging interface 6, which is electrically connected to the battery pack 2 and is used to charge the battery pack 2.

[0078] In some embodiments, such as Figure 1 As shown, the battery pack also includes a high-voltage output port 7. One end of the high-voltage output port 7 is electrically connected to the battery pack 2, and the other end is electrically connected to other electrical equipment in the vehicle to supply power to the electrical equipment.

[0079] In some embodiments, such as Figure 1 As shown, the battery pack also includes a communication interface 8, which is connected to the controller in the battery pack for transmitting signals.

[0080] In some embodiments, such as Figure 1 As shown, the battery pack also includes an inlet 9, an outlet 10, and a cold plate; the cold plate is located at the bottom of the battery pack 2, and a cooling channel is provided in the cold plate. The inlet 9 and the outlet 10 are respectively connected to the cooling channel, and a cooling medium is provided in the cooling channel. The cooling medium is used to dissipate heat from the bottom of the battery pack 2.

[0081] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0082] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A battery pack, characterized in that, include: The casing (1), the battery pack (2), and the top cover assembly (3); The housing (1) has a receiving cavity, the receiving cavity has an opening and a bottom wall that are arranged opposite to each other, the battery pack (2) is disposed in the receiving cavity and connected to the bottom wall of the cavity, and the top cover assembly (3) is connected to the housing (1) and covers the opening of the cavity; The top cover assembly (3) is provided with a cooling cavity (34), which is filled with a phase change material. The phase change material is capable of generating a phase change to absorb the heat generated by the battery pack (2).

2. The battery pack according to claim 1, characterized in that, The top cover assembly (3) is thermally connected to the battery pack (2), and the top cover assembly (3) is provided with a plurality of cooling chambers (34), which are spaced apart.

3. The battery pack according to claim 2, characterized in that, The battery pack has a first direction (X) and a second direction (Y) that are perpendicular to each other. The battery pack (2) includes a plurality of cell rows (23) spaced apart along the first direction (X). Each cell row (23) includes a plurality of cells (21) spaced apart along the second direction (Y). Each cooling cavity (34) corresponds to one of the cell rows (23).

4. The battery pack according to claim 1, characterized in that, The top cover assembly (3) includes a top cover body (31) and a cover plate (32); The top cover body (31) is placed over the cavity opening. The top cover body (31) is thermally connected to the battery pack (2). A cooling groove (4) is provided on the side of the top cover body (31) away from the cavity opening. A slot is provided on the side of the cooling groove (4) away from the cavity opening. The cover plate (32) is connected to the top cover body (31). The cover plate (32) covers at least the slot to form the cooling cavity (34).

5. The battery pack according to claim 4, characterized in that, The top cover assembly (3) also includes a protrusion (33); The cooling tank (4) also has a bottom wall opposite to the opening of the tank; the bottom wall near the cover plate (32) is provided with a plurality of spaced protrusions (33), the plurality of protrusions (33) divide the cooling tank (4) into a plurality of sub-grooves (41), and at least a portion of the sub-grooves (41) are provided with the phase change material.

6. The battery pack according to claim 5, characterized in that, The multiple sub-grooves (41) are interconnected.

7. The battery pack according to claim 5, characterized in that, The battery pack (2) includes multiple cell rows (23), each cell row (23) including multiple cells (21) stacked sequentially; the extension direction of the sub-groove (41) is the same as the stacking direction of the multiple cells (21).

8. The battery pack according to claim 1, characterized in that, It also includes heat-conducting components (5); The heat-conducting component (5) is disposed between the battery pack (2) and the top cover assembly (3), and the heat-conducting component (5) is thermally connected to the battery pack (2) and the top cover assembly (3) respectively.

9. The battery pack according to claim 8, characterized in that, The heat-conducting component (5) has a positioning groove (51) at a position corresponding to the cooling cavity (34), and the part of the top cover assembly (3) that has the cooling cavity (34) is embedded in the positioning groove (51).

10. The battery pack according to claim 8, characterized in that, The battery pack (2) also includes multiple battery cells (21) and multiple busbars (22); Multiple battery cells are stacked in the receiving cavity, and a busbar (22) is provided between two adjacent battery cells (21), and the two adjacent battery cells (21) are electrically connected through the busbar (22); The heat-conducting component (5) has a groove (52) at a position corresponding to the busbar (22), and the busbar (22) is at least partially embedded in the groove (52).

Images