Battery shell with thermal management function, battery and battery pack

Abstract

The utility model belongs to the technical field of batteries, and discloses a battery shell with a heat management function, a battery and a battery pack. A battery case having a thermal management function, comprising: an inner case; a housing; and a reinforcing member. The battery comprises the battery shell with the heat management function. The battery pack comprises the battery. According to the battery shell with the heat management function, the hollow interlayer is divided into the plurality of hollow units by adopting the plurality of reinforcers, and the phase change materials are filled in the hollow units, so that the mechanical strength can be enhanced by utilizing the reinforcers, and the hollow units with the same shape can be provided; and the heat dissipation uniformity and the heat stability are improved. According to the utility model, the battery adopts the battery shell with a thermal management function, and the battery pack adopts the battery, so that both the battery shell and the battery shell have relatively strong mechanical stability and thermal stability.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a battery casing, battery, and battery pack with thermal management function. Background Technology

[0002] Existing batteries typically use a single-layer metal casing. During high-power charging and discharging, a large amount of heat is easily generated inside the battery, leading to temperature rise and potentially causing thermal runaway. The heat dissipation efficiency of directly exchanging heat with the surrounding environment through a single-layer metal casing is low, limiting further improvement in battery performance. Furthermore, a single-layer metal casing cannot provide sufficient mechanical protection for the battery, increasing the safety risks when the battery is subjected to impact or puncture.

[0003] Chinese utility model patent CN220873688U discloses a battery casing and a power battery. The battery casing is used to cover the entire internal cell of the power battery. The battery casing adopts a thin-walled cavity with a phase change material for heat dissipation encapsulated inside. The thin-walled double-layer cavity includes an upper wall and a lower wall, which are connected by a reinforcing structure.

[0004] The above technical solutions have the following problems: When the reinforcing structure is multiple identical cylindrical or square columnar structures, the manufacturing process is more difficult and production costs are increased because both cylindrical and square columnar structures are arranged in a point-like manner; when the reinforcing structure is a strip structure, for cylindrical batteries, the strip structure divides the bottom of the cylindrical battery into chambers of different shapes. Furthermore, regardless of whether the battery is cylindrical or square, if a strip structure is used to connect each thin-walled double-layer cavity, at least two different shaped chambers will be obtained. The flow of phase change material in chambers of different shapes affects the uniformity of heat dissipation. Utility Model Content

[0005] To overcome the shortcomings of the prior art, one of the objectives of this utility model is to provide a battery casing with thermal management function. The hollow sandwich layer is divided into multiple hollow units by multiple reinforcing members. The hollow units are filled with phase change material, and the multiple hollow units are interconnected through connecting gaps. The above structure can not only use reinforcing members to enhance mechanical strength, but also provide hollow units of the same shape to improve the uniformity of heat dissipation and thermal stability, thereby realizing the thermal management function.

[0006] The second objective of this utility model is to provide a battery that uses the aforementioned battery casing with thermal management function, thereby improving the overall impact resistance and puncture resistance of the battery, reducing the safety risks caused by mechanical damage, and having high heat dissipation efficiency to ensure the battery's performance under high load conditions.

[0007] The third objective of this utility model is to provide a battery pack that uses the aforementioned battery and has strong mechanical and thermal stability.

[0008] One of the objectives of this utility model is achieved through the following technical solution:

[0009] A battery casing with thermal management function includes:

[0010] Inner shell, which is used to cover the outside of the battery cell assembly;

[0011] The outer shell is fitted over the inner shell, and a hollow interlayer is formed between the inner shell and the outer shell;

[0012] The hollow interlayer contains multiple reinforcing members, each including a first reinforcing part and a second reinforcing part that are interconnected. The first reinforcing part extends along the axial direction of the inner shell, and the second reinforcing part extends along the radial direction of the inner shell. The multiple second reinforcing parts are arranged radially, and the ends of adjacent second reinforcing parts that are away from the first reinforcing part are separated from each other to form a communicating gap.

[0013] Multiple reinforcing members divide the hollow sandwich layer into multiple hollow units, which are filled with phase change material, and the multiple hollow units are interconnected through connecting gaps.

[0014] In a preferred embodiment, the hollow unit includes a first region and a second region that are interconnected, the first region extending axially toward the inner shell and the second region extending radially toward the inner shell.

[0015] The axial cross-section of the reinforcing member and the axial cross-section of the hollow unit are both "L" shaped, the radial cross-section of the first region is arc-shaped, and the radial cross-section of the second region is fan-shaped.

[0016] In a preferred embodiment, a plurality of second reinforcing portions are arranged radially around the central axis of the inner shell, and the connecting gap is positioned close to the central axis of the inner shell.

[0017] In a preferred embodiment, multiple reinforcing members uniformly divide the hollow interlayer into multiple hollow units of the same shape and size.

[0018] In a preferred embodiment, the included angle between two adjacent second reinforcing portions is 30°-45°.

[0019] In a preferred embodiment, the reinforcing member is rib-shaped or strip-shaped, with the inner side of the reinforcing member connected to the inner shell and the outer side of the reinforcing member connected to the outer shell.

[0020] In a preferred embodiment, both the inner shell and the outer shell are cylindrical or square sleeves.

[0021] In a preferred embodiment, the phase change material is a hydrated salt phase change material or a waxy phase change material.

[0022] The second objective of this utility model is achieved by the following technical solution:

[0023] A battery comprising the aforementioned battery casing with thermal management function.

[0024] The third objective of this utility model is achieved by the following technical solution:

[0025] A battery pack comprising the aforementioned battery.

[0026] In summary, this utility model has the following technical effects:

[0027] 1. The battery casing with thermal management function in this utility model uses multiple reinforcing members to divide the hollow sandwich layer into multiple hollow units. The hollow units are filled with phase change material, and the multiple hollow units are interconnected through connecting gaps. The above structure can not only use reinforcing members to enhance mechanical strength, but also provide hollow units of the same shape to improve the uniformity of heat dissipation and thermal stability, thereby realizing the thermal management function.

[0028] 2. The battery in this utility model adopts the above-mentioned battery casing with thermal management function, which improves the overall impact resistance and puncture resistance of the battery, reduces the safety risks caused by mechanical damage, and has high heat dissipation efficiency, ensuring the performance of the battery under high load conditions.

[0029] 3. The battery pack in this utility model uses the above-mentioned battery, which has strong mechanical stability and thermal stability. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the external structure of an embodiment of the present utility model;

[0031] Figure 2 This is a schematic diagram of the internal structure of an embodiment of the present utility model;

[0032] Figure 3 This is a top-view structural diagram of the first region of the hollow unit in this embodiment of the present invention;

[0033] Figure 4 This is an embodiment of the present utility model. Figure 3 An enlarged structural diagram;

[0034] Figure 5 This is a top-view structural diagram of the second region of the hollow unit in this embodiment of the present invention;

[0035] Figure 6This is a schematic diagram of the heat dissipation path when used in an embodiment of this utility model.

[0036] The meanings of the reference numerals in the attached figures are as follows:

[0037] 10. Inner shell; 20. Outer shell; 30. Reinforcing member; 301. First reinforcing part; 302. Second reinforcing part; 40. Hollow unit; 401. First region; 402. Second region; 50. Connecting gap; 60. Connecting hole; a. Angle between adjacent second reinforcing parts. Detailed Implementation

[0038] To better understand and implement this invention, the technical solutions in the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings.

[0039] In the description of this utility model, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model 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. Therefore, they should not be construed as limitations on this utility model.

[0040] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0041] See Figures 1-6 A battery casing with thermal management function includes: an inner shell 10, which is fitted over the outside of a battery cell assembly; an outer shell 20, which is fitted over the outside of the inner shell 10, and a hollow interlayer is formed between the inner shell 10 and the outer shell 20; and reinforcing members 30, a plurality of reinforcing members 30 arranged within the hollow interlayer, each reinforcing member 30 including a first reinforcing portion 301 and a second reinforcing portion 302 connected to each other. The first reinforcing portion 301 extends along the axial direction of the inner shell 10, and the second reinforcing portion 302 extends along the radial direction of the inner shell 10. The plurality of second reinforcing portions 302 are arranged radially, and the ends of adjacent second reinforcing portions 302 away from the first reinforcing portion 301 are separated from each other to form a communication gap 50. The plurality of reinforcing members 30 divide the hollow interlayer into a plurality of hollow units 40, each hollow unit 40 being filled with a phase change material, and the plurality of hollow units 40 being interconnected through the communication gaps 50.

[0042] The battery casing with thermal management function in this utility model uses multiple reinforcing members 30 to divide the hollow sandwich layer into multiple hollow units 40. The hollow units 40 are filled with phase change material, and the multiple hollow units 40 are interconnected through connecting gaps 50. The phase change material absorbs and releases heat during battery operation. The above structure can not only use the reinforcing members 30 to enhance mechanical strength, but also provide hollow units 40 of the same shape to improve the uniformity of heat dissipation and thermal stability, thereby realizing the thermal management function.

[0043] In this embodiment of the utility model, the hollow unit 40 includes a first region 401 and a second region 402 that are interconnected. The first region 401 extends axially toward the inner shell 10, and the second region 402 extends radially toward the inner shell 10. The axial cross-section of the reinforcing member 30 and the axial cross-section of the hollow unit 40 are both "L" shaped. The radial cross-section of the first region 401 is arc-shaped, and the radial cross-section of the second region 402 is fan-shaped.

[0044] See Figure 5 Specifically, the second region 402 gradually increases in size along the direction from the center of the inner shell 10 to its edge.

[0045] In this embodiment of the utility model, a plurality of second reinforcing parts 302 are arranged radially around the central axis of the inner shell 10, and the connecting gap 50 is located near the central axis of the inner shell 10.

[0046] Specifically, the inner shell 10 and the outer shell 20 are coaxially arranged.

[0047] More specifically, the length of the second reinforcing part 302 is less than the radius of the outer shell 20, and a gap is formed between the inner endpoints of each second reinforcing part 302. That is, a connecting hole 60 is formed in the center of the hollow interlayer, which connects all the hollow units 40, and all the hollow units 40 are interconnected through the connecting hole 60.

[0048] In this embodiment of the invention, multiple reinforcing members 30 uniformly divide the hollow interlayer into multiple hollow units 40 of the same shape and size, which is conducive to achieving uniform heat dissipation.

[0049] Based on the above structure, when the liquid phase change material in each hollow unit 40 absorbs heat and expands, or absorbs heat and vaporizes, the phase change material in each hollow unit 40 flows along the direction from the second region 402 to the first region 401, and continues to flow from bottom to top along the first region 401. Since the diameter of the second region 402 gradually increases from the center of the inner shell 10 to its edge, it reaches its maximum at the intersection of the second region 402 and the first region 401, that is, at the corner of the hollow unit 40, which facilitates the flow of the phase change material.

[0050] The above structure forms a self-heating mechanism to protect the battery. The hollow unit 40 works in conjunction with the phase change material to reduce dependence on the external cooling system. The optimized heat conduction path effectively transfers heat to the hollow unit and is absorbed by the phase change material, improving heat dissipation efficiency.

[0051] Continue reading Figure 5 In this embodiment of the invention, the included angle between two adjacent second reinforcing portions 302 is 30°-45°.

[0052] Preferably, the included angle between two adjacent second reinforcing portions 302 is 36°.

[0053] It should be noted that as the number of reinforcing members 30 increases, the mechanical strength of the battery casing with thermal management function increases. Furthermore, the number of hollow units 40 obtained by dividing the hollow interlayer with the reinforcing members 30 increases. Since the size of the hollow interlayer is fixed, as the number of hollow units 40 increases, the volume of each hollow unit 40 decreases, and the volume of the phase change material contained within it decreases, thereby reducing the efficiency of heat dissipation using the phase change material. Conversely, as the number of reinforcing members 30 decreases, the mechanical strength of the battery casing with thermal management function decreases. Also, since the size of the hollow interlayer is fixed, as the number of hollow units 40 decreases, the volume of each hollow unit 40 increases, and the volume of the phase change material contained within it increases, thereby improving the efficiency of heat dissipation using the phase change material.

[0054] Calculations show that when the included angle between two adjacent second reinforcing parts 302 is 36°, that is, when 10 reinforcing members 30 are provided, the above structure can balance the mechanical strength and heat dissipation efficiency of the battery casing with thermal management function, so that the battery casing with thermal management function has both high mechanical strength and high heat dissipation efficiency.

[0055] In this embodiment of the utility model, the reinforcing member 30 is rib-shaped or strip-shaped, the inner side of the reinforcing member 30 is connected to the inner shell 10, and the outer side of the reinforcing member 30 is connected to the outer shell 20; by setting the rib-shaped or strip-shaped reinforcing member 30, the mechanical strength of the battery shell with thermal management function is provided, and the above structural design is relatively simple, optimizing the manufacturing process of the battery shell and reducing production costs.

[0056] The hollow units 40 are connected only through the connecting gap 50, and the remaining parts of the hollow units 40 are covered by the reinforcing member 30, the inner shell 10 and the outer shell 20; the top of the hollow unit 40 can be covered by the inner shell 10 extending outward or the outer shell 20 extending inward, so that the hollow interlayer is a closed interlayer.

[0057] Specifically, the inner shell 10, the outer shell 20, and the reinforcing member 30 can be made of metal, plastic, or other materials, depending on the actual situation, and are not limited thereto.

[0058] More specifically, the reinforcing member 30 is integrally formed with at least one of the inner shell 10 and the outer shell 20; when the reinforcing member 30 is formed separately from the inner shell 10, the reinforcing member 30 can be connected and fixed to the inner shell 10 by welding, bonding or snap-fitting to improve the connection stability of the reinforcing member 30; when the reinforcing member 30 is formed separately from the outer shell 20, the reinforcing member 30 can be connected and fixed to the outer shell 20 by welding, bonding or snap-fitting to improve the connection stability of the reinforcing member 30; the connection method of the reinforcing member 30 depends on the material of the inner shell 10, the material of the outer shell 20, the material of the reinforcing member 30 and the actual situation, and is not limited thereto.

[0059] In this embodiment of the utility model, both the inner shell 10 and the outer shell 20 are cylindrical sleeves or square sleeves.

[0060] Specifically, when both the inner shell 10 and the outer shell 20 are cylindrical sleeves, the battery housing with thermal management function is suitable for cylindrical batteries; when both the inner shell 10 and the outer shell 20 are square sleeves, the battery housing with thermal management function is suitable for square batteries.

[0061] In this embodiment of the invention, the phase change material is a hydrated salt phase change material or a waxy phase change material.

[0062] For example, depending on the actual application scenario, crystalline hydrated salts, molten salts, metals or alloys, paraffin, acetic acid, water, ethanol, and other organic substances can be selected.

[0063] The phase change material filled in the hollow unit 40 absorbs a large amount of heat during the phase change process, reducing the battery temperature, improving thermal stability, and reducing the battery's dependence on the active cooling system.

[0064] This utility model discloses a battery (not shown in the accompanying drawings), which includes the battery casing with thermal management function described above.

[0065] It should be noted that the battery also includes battery cell assemblies, which can adopt existing structures. Of course, the battery can also include other existing structures that can work with the battery casing with thermal management functions to realize the battery function, which will not be elaborated here.

[0066] The battery in this invention uses a battery casing with thermal management function, which improves the overall impact resistance and puncture resistance of the battery, reduces the safety risks caused by mechanical damage, and has high heat dissipation efficiency, ensuring the battery's performance under high load conditions.

[0067] This utility model discloses a battery pack (not shown in the accompanying drawings), which includes the battery described above.

[0068] It should be noted that the battery pack may also include other existing structures that can work with the above-mentioned batteries to achieve the functions of the battery pack, which will not be described in detail here.

[0069] The battery pack in this invention uses the aforementioned battery, which has strong mechanical and thermal stability.

[0070] The technical means disclosed in this utility model are not limited to those disclosed in the above embodiments, but also include technical solutions composed of any combination of the above technical features. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of this utility model, and these improvements and modifications are also considered within the scope of protection of this utility model.

Claims

1. A battery case having a heat management function, characterized by, The battery shell with heat management function comprises: an inner shell, which is arranged outside a battery cell assembly; an outer shell, which is arranged outside the inner shell, and a hollow interlayer is formed between the inner shell and the outer shell; a plurality of reinforcing members arranged in the hollow interlayer, each of the reinforcing members comprising a first reinforcing portion and a second reinforcing portion, the first reinforcing portion extending along an axial direction of the inner shell, and the second reinforcing portion extending along a radial direction of the inner shell, and a plurality of the second reinforcing portions are arranged radially, and adjacent second reinforcing portions are separated from each other to form a communication gap; a plurality of the reinforcing members divide the hollow interlayer into a plurality of hollow units, each of the hollow units is filled with a phase change material, and the hollow units are communicated with each other through the communication gap.

2. The battery case having a thermal management function according to claim 1, characterized by: The hollow unit comprises a first region and a second region, the first region extending along the axial direction of the inner shell, and the second region extending along the radial direction of the inner shell. The axial cross section of the reinforcing member and the axial cross section of the hollow unit are both "L" shaped, the radial cross section of the first region is arc-shaped, and the radial cross section of the second region is fan-shaped. 3.The battery case having a thermal management function according to claim 1, characterized in that: The plurality of second reinforcing portions are arranged radially around a central axis of the inner shell, and the communication gap is arranged close to the central axis of the inner shell. 4.The battery case having a thermal management function according to claim 1, characterized in that: The plurality of reinforcing members uniformly divide the hollow interlayer into a plurality of hollow units with the same shape and size.

5. The battery case having a thermal management function according to claim 4, characterized by: The included angle between two adjacent second reinforcing portions is 30°-45°.

6. The battery case having a thermal management function according to any one of claims 1 to 4, characterized by: The reinforcing member is in the shape of a rib or a strip, the inner side of the reinforcing member is connected to the inner shell, and the outer side of the reinforcing member is connected to the outer shell.

7. The battery case having a thermal management function according to any one of claims 1 to 4, characterized by: The inner shell and the outer shell are both cylindrical sleeves or square sleeves.

8. The battery case having a thermal management function according to any one of claims 1 to 4, characterized by: The phase change material is a hydrated salt phase change material or a waxy phase change material.

9. A battery, characterized by The battery shell with heat management function comprises:

10. A battery pack, characterized by, The battery comprises:

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