Cooling structure, battery pack and electric device

Abstract

The utility model provides a cooling structure, a battery pack and an electric device. The cooling structure is used for cooling a battery cell and comprises a cooling part and a first heat insulation layer, the cooling part comprises a first cooling plate, a second cooling plate and third cooling plates which are communicated with one another, the third cooling plates are clamped between the first cooling plate and the second cooling plate, a containing cavity for containing the battery cells is formed between the first cooling plate and the second cooling plate, and the third cooling plates are arranged on the two sides of each battery cell; the first heat insulation layer is arranged on the third cooling plate and is positioned between the large surface of each battery cell and the third cooling plate. According to the cooling structure, the use safety of the battery pack can be improved, and the use quality of the battery pack can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of battery packs, and in particular to a cooling structure. The present invention also relates to a battery pack equipped with the cooling structure, and an electrical device equipped with the battery pack. Background Art

[0002] In today's rapidly developing society, with growing awareness of environmental protection and the concept of sustainable development gaining widespread acceptance, electric vehicles, as a clean and efficient means of transportation, are being promoted and adopted globally at an unprecedented rate. In electric vehicles, the power battery pack is a key energy provider. However, while enjoying the advantages of efficient energy conversion and low emissions, the safety issues of power battery packs are becoming increasingly prominent.

[0003] Specifically, the safety challenges of power battery packs primarily stem from the complex chemical reactions within them. When a cell in a battery module triggers an abnormal exothermic reaction due to factors such as an internal short circuit, overcharge, overdischarge, or external physical damage, it causes a rapid temperature rise that is difficult to control through normal heat dissipation mechanisms. This phenomenon is known as "thermal runaway." Once the heat generated by the battery module exceeds the handling capacity of the cooling system, thermal runaway is inevitable, potentially leading to serious consequences such as battery casing rupture, electrolyte leakage, and even fire.

[0004] Even more problematic is that thermal runaway often has a chain reaction nature. That is, after a battery cell experiences thermal runaway, the massive amount of heat and harmful gases it releases can quickly affect adjacent cells, causing the thermal runaway phenomenon to spread rapidly within the battery module. This process is known as "thermal runaway propagation," or simply "thermal diffusion." Thermal diffusion not only significantly weakens the overall safety of the battery pack but can also trigger broader system failures, posing a direct threat to occupant safety and hindering the performance of the battery pack. Utility Model Content

[0005] In view of this, the present invention aims to provide a cooling structure to improve the safety and quality of a battery pack.

[0006] In order to achieve the above-mentioned purpose, the technical solution of the utility model is achieved as follows:

[0007] A cooling structure for cooling a battery core, comprising a cooling portion and a first heat insulation layer;

[0008] The cooling unit includes a first cooling plate, a second cooling plate, and a third cooling plate that are interconnected. The third cooling plate is sandwiched between the first cooling plate and the second cooling plate. A receiving cavity for receiving the battery cells is formed between the first cooling plate and the second cooling plate. The third cooling plate is provided on both sides of each battery cell.

[0009] The first heat insulation layer is provided on the third cooling plate and is located between the large surface of each of the battery cells and the third cooling plate.

[0010] Furthermore, a second heat insulation layer is provided on a surface of the third cooling plate facing the outside of the accommodating cavity.

[0011] Furthermore, the first thermal insulation layer and the second thermal insulation layer are both aerogel layers.

[0012] Furthermore, a plurality of temperature detection elements are spaced apart in the first heat insulation layer.

[0013] Furthermore, the temperature detection element is a temperature sensor.

[0014] Furthermore, when the battery cell is a ternary battery cell, the thickness of the first thermal insulation layer and the second thermal insulation layer ranges from 2 mm to 5 mm; and / or,

[0015] When the battery core is a lithium iron battery core, the thickness of the first thermal insulation layer and the second thermal insulation layer ranges from 0.5 mm to 2 mm.

[0016] Compared with the prior art, the present invention has the following advantages:

[0017] The cooling structure described in the present invention can reduce the temperature of the battery cell before thermal runaway of the battery cell through the provision of the cooling part, thereby avoiding the occurrence of thermal runaway of the battery cell as much as possible. When thermal runaway occurs, the battery cell can be cooled in multiple directions through the cooperation of the first cooling plate, the second cooling plate and the third cooling plate, which is beneficial to improving the cooling effect of the battery cell. The provision of the first thermal insulation layer can slow down the speed of heat diffusion after thermal runaway of the battery cell, thereby improving the safety of the battery pack and improving the quality of the battery pack.

[0018] In addition, the provision of a second thermal insulation layer further enhances the protection against thermal runaway of the battery cell, and the structure is simple, facilitating design and implementation. Both the first and second thermal insulation layers are aerogel layers, making them easy to manufacture and simple in structure, facilitating design and implementation.

[0019] Furthermore, the temperature sensing element allows for real-time monitoring of the cell temperature, facilitating temperature control via the cooling unit. This simple structure facilitates design and implementation. Different insulation layer thicknesses can be configured for different cell materials, improving the cooling efficiency of the cooling unit and the protective effect of the insulation layer, further facilitating design and implementation.

[0020] The present invention further provides a battery pack, in which the cooling structure as described above is provided.

[0021] The present invention also provides an electrical device, in which the battery pack as described above is provided.

[0022] The battery pack and the electrical device described in the present invention have the same beneficial effects as the cooling structure described above compared to the prior art, so they will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings, which constitute part of the present invention, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0024] Figure 1 This is a schematic structural diagram of the cooling structure according to an embodiment of the present utility model;

[0025] Figure 2 A top view of the cooling structure according to an embodiment of the present utility model;

[0026] Figure 3 A side view of the cooling structure according to an embodiment of the present invention;

[0027] Description of reference numerals:

[0028] 1. Cooling unit;

[0029] 101, first cooling plate; 102, second cooling plate; 103, third cooling plate; 104, liquid inlet; 105, liquid outlet;

[0030] 2. First thermal insulation layer; 3. Second thermal insulation layer; s. Accommodation cavity. DETAILED DESCRIPTION

[0031] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features therein can be combined with each other.

[0032] In the description of this utility model, it should be noted that if terms such as "upper," "lower," "inner," and "outer" appear to indicate orientation or positional relationships, these are based on the orientation or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They do not indicate or imply that the device or component referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, if terms such as "first" and "second" appear, they are used solely for descriptive purposes and should not be construed as indicating or implying relative importance.

[0033] Furthermore, in the description of this utility model, unless otherwise explicitly defined, the terms "mounted," "connected," "connection," and "connector" should be interpreted broadly. For example, they can refer to fixed, removable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; and internal communication between two components. Those skilled in the art will understand the specific meanings of these terms in this utility model based on specific circumstances.

[0034] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0035] Example 1

[0036] This embodiment relates to a cooling structure, which aims to improve the safety and quality of a battery pack by optimizing the cooling structure.

[0037] In terms of overall structure, Figures 1 to 3 As shown, the cooling structure in this embodiment is used to cool the battery core, and includes a cooling part 1 and a first thermal insulation layer 2.

[0038] Among them, the cooling part 1 includes a first cooling plate 101, a second cooling plate 102 and a third cooling plate 103 that are interconnected. The third cooling plate 103 is sandwiched between the first cooling plate 101 and the second cooling plate 102, and a accommodating cavity s for accommodating battery cells is formed between the first cooling plate 101 and the second cooling plate 102. A third cooling plate 103 is provided on both sides of each battery cell. The first thermal insulation layer 2 is provided on the third cooling plate 103 and is located between the large surface of each battery cell and the third cooling plate 103.

[0039] As configured above, the cooling structure in this embodiment can reduce the temperature of the battery cell before thermal runaway occurs through the setting of the cooling part 1, so as to avoid the occurrence of thermal runaway of the battery cell as much as possible. When thermal runaway occurs, the battery cell can be cooled in multiple directions through the cooperation of the first cooling plate 101, the second cooling plate 102 and the third cooling plate 103, which is beneficial to improving the cooling effect of the battery cell, and the setting of the first thermal insulation layer 2 can slow down the speed of heat diffusion after thermal runaway of the battery cell, thereby improving the safety of the battery pack and improving the quality of the battery pack.

[0040] Specifically, in this embodiment, as an exemplary structure, combined with Figures 1 to 3 As shown, in order to better improve the protection effect of thermal runaway of the battery cell, the third cooling plate 103 of the cooling structure in this embodiment is provided with a second thermal insulation layer 3 on the side facing the outside of the accommodating cavity s. By setting the second thermal insulation layer 3, the protection effect of thermal runaway of the battery cell is better improved, the structure is simple, and it is conducive to design and implementation.

[0041] More specifically, in this embodiment, both the first insulation layer 2 and the second insulation layer 3 are aerogel layers. This makes both the first insulation layer 2 and the second insulation layer 3 easy to manufacture, simple in structure, and convenient for design and implementation. Furthermore, the aerogel layer can slow heat loss from the module, thereby helping to maintain the optimal temperature range for unleashing the battery cell's performance.

[0042] In addition, to facilitate real-time detection of the battery cell temperature, in this embodiment, multiple temperature detection elements are spaced apart within the first insulation layer 2. Preferably, the temperature detection elements can be, for example, temperature sensors in the prior art. By providing the temperature detection elements, the battery cell temperature can be detected in real time, thereby facilitating temperature regulation of the battery cell through the cooling unit 1. The structure is simple and easy to design and implement. The number of temperature sensors can be, for example, six, spaced apart and embedded within the aerogel layer. The six temperature sensors are evenly arranged within the aerogel layer to monitor the temperature of the battery cell. Of course, the number of temperature sensors can also be four, eight, ten, etc., as long as they can monitor the battery cell temperature at multiple locations.

[0043] In order to better adapt to different types of battery cells, the thickness of the first insulation layer 2 and the second insulation layer 3 of the cooling structure in this embodiment can also be set accordingly. When the battery cell is a ternary battery cell, the thickness of the first insulation layer 2 and the second insulation layer 3 ranges from 2mm to 5mm. Specifically, the thickness of the first insulation layer 2 and the second insulation layer 3 can be, for example, 2mm, 2.5mm, 3mm, 3.5mm, etc. When the battery cell is a lithium iron battery cell, the thickness of the first insulation layer 2 and the second insulation layer 3 ranges from 0.5mm to 2mm. Specifically, the thickness of the first insulation layer 2 and the second insulation layer 3 can be, for example, 0.5mm, 1mm, 1.5mm, 2mm, etc. It is only necessary to adjust the thickness of the first insulation layer 2 and the second insulation layer 3 according to the type of battery cell. It is worth mentioning that the thickness of the first insulation layer 2 and the second insulation layer 3 can be the same or different, as long as it is within the thickness range corresponding to the type of battery cell.

[0044] In addition, combined Figures 1 to 3 As shown, the third cooling plate 103 in this embodiment is sandwiched between the first cooling plate 101 and the second cooling plate 102, and the accommodating cavity s is formed between the first cooling plate 101, the second cooling plate 102 and the two third cooling plates 103. The number of third cooling plates 103 can be set accordingly according to the number of battery cells. Specifically, in this embodiment, a liquid inlet 104 is provided on the first cooling plate 101, and a liquid outlet 105 is provided on the second cooling plate 102. The first cooling plate 101, the second cooling plate 102 and the third cooling plate 103 are all provided with flow channels, and the flow channels of the first cooling plate 101, the second cooling plate 102 and the third cooling plate 103 are interconnected. Liquid flows in through the liquid inlet 104 and flows out through the liquid outlet 105 after flowing through each cooling plate. The connection method of the liquid inlet 104, the flow channel and the liquid outlet 105 in this embodiment can refer to the connection method in the prior art.

[0045] It should be noted that if the liquid flowing through the cooling structure in this embodiment is a low-temperature liquid, it can be used to cool the battery cell. When the liquid flowing through the cooling structure is a high-temperature liquid, it can be used to heat the low-temperature battery cell to increase the battery cell temperature to a suitable operating temperature. The provision of the first thermal insulation layer 2 and the second thermal insulation layer 3 can prevent the battery cell temperature from dissipating too quickly, thereby facilitating the maintenance of the battery cell's operating temperature. In addition, when thermal runaway occurs in the battery cell, the provision of the first thermal insulation layer 2 and the second thermal insulation layer 3 can help limit the thermal diffusion of the battery cell, thereby improving the safety and quality of the battery pack.

[0046] In this embodiment, taking the number of battery cells as two as an example, the number of third cooling plates 103 is three, and only one third cooling plate 103 is provided between the two battery cells. At this time, the first thermal insulation layer 2 is facing the large surface of each battery cell, and the second thermal insulation layer 3 is provided on the outward-facing surface of the third cooling plates 103 located at both ends.

[0047] The cooling structure of this embodiment can reduce the temperature of the battery cell before thermal runaway occurs, thereby avoiding the occurrence of thermal runaway of the battery cell as much as possible. After thermal runaway occurs, the battery cell can be cooled in multiple directions through the cooperation of the cooling part 1 and the thermal insulation layer, which is beneficial to improving the cooling effect of the battery cell. The setting of the thermal insulation layer can slow down the speed of heat diffusion after thermal runaway of the battery cell, thereby improving the safety of the battery pack and improving the quality of the battery pack.

[0048] Example 2

[0049] This embodiment relates to a battery pack, in which the cooling structure of the first embodiment is provided.

[0050] The battery pack in this embodiment can reduce the risk of thermal runaway and heat diffusion by providing the cooling structure in the first embodiment, which is beneficial to improving the safety and quality of the battery pack.

[0051] Example 3

[0052] This embodiment relates to an electrical device, in which the battery pack of the second embodiment is provided.

[0053] The electrical device in this embodiment, through the arrangement of the battery pack in Example 2, can reduce the risk of thermal runaway and thermal diffusion of the battery pack, which is beneficial to improving the safety and quality of use of the battery pack and thus improving the safety and quality of use of the electrical device.

[0054] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A cooling structure for cooling a battery cell, characterized in that: comprising a cooling portion and a first heat insulating layer; The cooling unit includes a first cooling plate, a second cooling plate, and a third cooling plate that are interconnected. The third cooling plate is sandwiched between the first cooling plate and the second cooling plate. A receiving cavity for receiving the battery cells is formed between the first cooling plate and the second cooling plate. The third cooling plate is provided on both sides of each battery cell. The first heat insulation layer is provided on the third cooling plate and is located between the large surface of each of the battery cells and the third cooling plate.

2. The cooling structure according to claim 1, characterized in that: A second heat insulation layer is provided on a surface of the third cooling plate facing the outside of the accommodating cavity.

3. The cooling structure according to claim 2, characterized in that: The first thermal insulation layer and the second thermal insulation layer are both aerogel layers.

4. The cooling structure according to claim 1, wherein: A plurality of temperature detection elements are spaced apart in the first heat insulation layer.

5. The cooling structure according to claim 4, characterized in that: The temperature detection element is a temperature sensor.

6. The cooling structure according to claim 2, characterized in that: When the battery cell is a ternary battery cell, the thickness of the first thermal insulation layer and the second thermal insulation layer ranges from 2 mm to 5 mm; and / or, When the battery core is a lithium iron battery core, the thickness of the first thermal insulation layer and the second thermal insulation layer ranges from 0.5 mm to 2 mm.

7. A battery pack, characterized in that: The battery pack is provided with a cooling structure according to any one of claims 1 to 6.

8. An electrical device, characterized in that: The electrical device is provided with the battery pack as claimed in claim 7.

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