Heat dissipation structure of lithium ion battery and lithium ion battery

Abstract

The utility model provides a heat dissipation structure of a lithium ion battery and the lithium ion battery, and relates to the field of lithium ion batteries. The heat dissipation structure of the lithium ion battery comprises a battery shell, a battery module and pouring sealant, one end of the battery shell is provided with an opening, the battery module is arranged in the battery shell through the opening, a pouring gap is formed between the battery module and the battery shell, and the pouring sealant is arranged in the battery shell. And the pouring height of the pouring sealant is higher than the mounting height of the battery module. The encapsulation gap between the battery module and the battery shell is encapsulated by the encapsulation adhesive, and the heat of the battery module is transferred to the battery shell through the encapsulation adhesive, so that an efficient heat dissipation effect can be realized.

Description

Technical Field

[0001] This application relates to the field of lithium-ion batteries, and more specifically, to a heat dissipation structure for a lithium-ion battery and a lithium-ion battery. Background Technology

[0002] With the rapid development of new energy vehicles, consumer electronics, and energy storage, lithium batteries, as a highly efficient and environmentally friendly energy storage device, are finding increasingly wider applications. Lithium batteries possess advantages such as high energy density, long cycle life, and low self-discharge rate, making them a core energy component in modern electronic devices and electric vehicles. However, lithium batteries generate a significant amount of heat during operation, especially under high-rate charging / discharging or high-temperature environments, where the internal temperature rises rapidly. If this heat cannot be dissipated effectively and promptly, it can lead to uneven temperature distribution within the battery, affecting its performance and lifespan. More seriously, localized overheating can trigger thermal runaway, potentially causing battery fires, explosions, and other safety accidents, posing a threat to personal safety and property.

[0003] Currently, there are three main heat dissipation technologies for lithium batteries: air cooling, liquid cooling, and phase change material (PCM) cooling. Air cooling systems remove heat generated by the battery through airflow, offering advantages such as simple structure and low cost. However, as battery energy density increases, the heat dissipation capacity of air cooling systems can no longer meet the heat dissipation requirements of high-power batteries. Liquid cooling systems exchange heat through a liquid medium, achieving high cooling efficiency. However, their system structure is complex, resulting in high manufacturing and maintenance costs. Furthermore, they place stringent requirements on system sealing and coolant performance, increasing the difficulty and cost of use. Phase change material (PCM) cooling utilizes the property of PCM to absorb or release a large amount of latent heat during phase change to regulate battery temperature. However, PCM has a low thermal conductivity, and its phase change temperature is greatly affected by the environment, making it difficult to achieve stable and efficient heat dissipation under complex operating conditions.

[0004] Therefore, existing heat dissipation technologies still have many shortcomings when dealing with high-power, high-energy-density applications of lithium batteries, and need to be further optimized and improved. Utility Model Content

[0005] The purpose of this application is to provide a heat dissipation structure for a lithium-ion battery and a lithium-ion battery that can achieve stable and efficient heat dissipation under complex working conditions.

[0006] In a first aspect, this utility model provides a heat dissipation structure for a lithium-ion battery. The heat dissipation structure for the lithium-ion battery includes a battery casing, a battery module, and a potting compound. One end of the battery casing is open, and the battery module is installed inside the battery casing through the opening. A potting gap is formed between the battery module and the battery casing, and the potting height of the potting compound is higher than the installation height of the battery module.

[0007] In an optional embodiment, the bottom surface of the battery module and the bottom surface of the housing form a first potting gap, the outer peripheral surface of the battery module and the inner side surface of the battery housing form a second potting gap, and the top surface of the battery module and the opening end of the battery housing form a third potting gap, and the potting adhesive fills the first potting gap, the second potting gap and the third potting gap.

[0008] In an optional embodiment, the outer peripheral surface of the battery module is provided with a plurality of grooves, and the groove wall of each groove forms a fourth potting gap with the battery housing, and the potting adhesive is also filled in the fourth potting gap.

[0009] In an optional embodiment, the potting compound includes silicone and a phase change heat-absorbing material, wherein the silicone coats the outer surface of the phase change heat-absorbing material.

[0010] In an optional embodiment, the potting compound is formed by mixing the silicone and the phase change heat-absorbing material in a preset ratio.

[0011] In an optional embodiment, the phase change heat-absorbing material is a paraffin phase change heat-absorbing material.

[0012] In an optional embodiment, the battery casing is made of a metallic material.

[0013] Secondly, this utility model provides a lithium-ion battery, which includes a battery management system and a heat dissipation structure for the lithium-ion battery as described in the foregoing embodiments. The battery management system is installed inside the battery housing and electrically connected to the battery module. The battery management system is located near the opening end of the battery housing relative to the battery module. The potting height of the potting compound is higher than the installation height of the battery management system.

[0014] In an optional embodiment, the lithium-ion battery further includes a top cover and a battery output connector, the battery output connector being disposed on the top cover and electrically connected to the battery management system, the top cover being disposed on the opening end, and the upper surface of the potting compound being adhered to the lower surface of the top cover.

[0015] In an optional embodiment, the lithium-ion battery further includes multiple fasteners. The inner side of the battery housing is provided with multiple protruding posts, each of which is provided with a threaded hole. The top cover is provided with multiple through holes, the number of which is the same as the number of the threaded holes and they correspond one-to-one. One of the fasteners passes through a corresponding through hole and is screwed into a corresponding threaded hole.

[0016] Compared to existing technologies, the beneficial effects of this application are:

[0017] This application uses potting compound to seal the gap between the battery module and the battery casing. The heat of the battery module is transferred to the battery casing through the potting compound, which can achieve efficient heat dissipation. In this application, the potting height of the potting compound is higher than the installation height of the battery module, which can ensure that the potting compound fixes the battery module as a whole in the battery casing. While maintaining a stable heat dissipation effect, this application improves the shock resistance and durability of the lithium-ion battery. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 Exploded views of the lithium battery structure in some embodiments are shown;

[0020] Figure 2 A cross-sectional schematic diagram of the lithium battery before potting with potting compound is shown in some embodiments;

[0021] Figure 3 A cross-sectional schematic diagram of a lithium battery after potting with potting compound is shown in some embodiments;

[0022] Figure 4 It shows Figure 3 Enlarged view of section A in the middle;

[0023] Figure 5 It shows Figure 1 Enlarged view of section B;

[0024] Figure 6 It shows Figure 1 Enlarged view of section C.

[0025] Explanation of key component symbols:

[0026] 10-Heat dissipation structure; 100-Battery housing; 110-Protruding post; 111-Threaded hole; 200-Battery module; 210-First potting gap; 220-Second potting gap; 230-Third potting gap; 240-Fourth potting gap; 300-Potting adhesive; 310-Silicone; 320-Phase change heat-absorbing material; 301-Through groove; 20-Battery management system; 30-Top cover; 31-Through hole; 40-Battery output connector; 50-Fastener. Detailed Implementation

[0027] The embodiments of this application are described in detail below. Examples of these embodiments are shown 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.

[0028] 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.

[0029] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0030] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., 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 mechanical connection or an electrical connection; 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 application according to the specific circumstances.

[0031] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0032] Example 1

[0033] This embodiment is applicable to

[0034] Please see Figure 1 This embodiment provides a heat dissipation structure 10 for a lithium-ion battery, which includes a battery casing 100, a battery module 200, and a potting compound 300.

[0035] One end of the battery casing 100 is open. In this embodiment, the battery casing 100 can be set to be a cuboid with a cuboid-shaped internal space. That is, the battery casing 100 is a thin-walled structure. In actual use, the battery casing 100 is made of metal material, which has good thermal conductivity.

[0036] In practical applications, the battery module 200 includes multiple battery cells, which are connected in series or in parallel and bundled together as a whole by steel cable ties.

[0037] Please see Figure 2 and Figure 3 The battery module 200 is installed inside the battery housing 100 through an opening, and a potting gap is formed between the battery module 200 and the battery housing 100. In this embodiment, the bottom surface of the battery module 200 and the bottom surface of the housing can be configured to form a first potting gap 210, the outer peripheral surface of the battery module 200 and the inner surface of the battery housing 100 can form a second potting gap 220, and the top surface of the battery module 200 and the opening end of the battery housing 100 can form a third potting gap 230.

[0038] Encapsulating adhesive 300 is filled into the first encapsulation gap 210, the second encapsulation gap 220, and the third encapsulation gap 230. The encapsulation height of the encapsulating adhesive 300 is higher than the installation height of the battery module 200, that is, the encapsulating adhesive 300 fixes the battery module 200 as a whole within the battery housing 100. While maintaining a stable heat dissipation effect, this embodiment increases the structural strength and fixation of the lithium-ion battery, improves the shock resistance and durability of the lithium-ion battery, and extends the battery's service life.

[0039] The outer peripheral surface of the battery module 200 is provided with multiple grooves, and the groove wall of each groove forms a fourth potting gap 240 with the battery housing 100. The potting compound 300 also fills the fourth potting gap 240.

[0040] Please see Figure 4 The potting compound 300 includes silicone 310 and phase change heat-absorbing material 320. The silicone 310 covers the outer surface of the phase change heat-absorbing material 320, thereby preventing the phase change heat-absorbing material 320 from scattering, so that the silicone 310 and the phase change heat-absorbing material 320 are mixed into a whole material.

[0041] The potting compound 300 is formed by mixing silicone 310 and phase change heat-absorbing material 320 in a preset ratio, wherein the phase change heat-absorbing material 320 is a paraffin phase change heat-absorbing material. Before potting, the phase change heat-absorbing material 320 is uniformly dispersed on the silicone 310, and the potting compound 300 after mixing the phase change heat-absorbing material 320 and silicone 310 is in a liquid state and has a certain degree of fluidity. After potting, the potting compound 300 hardens.

[0042] Please see Figures 1 to 3 In this embodiment, potting compound 300 is used to seal the potting gap between the battery module 200 and the battery housing 100. The heat of the battery module 200 is transferred to the battery housing 100 through the potting compound 300, which can achieve a high-efficiency heat dissipation effect.

[0043] When the temperature is higher than the preset temperature, the phase change heat-absorbing material 320 in the potting compound 300 begins to absorb the heat of the battery, achieving the dual effect of heat dissipation and heat absorption. When the battery temperature is much higher than the preset temperature, the heat is quickly transferred to the battery casing 100 through the potting compound 300 for heat dissipation, avoiding overheating or low temperature affecting the battery performance of the lithium-ion battery, thereby improving the safety and performance of the battery.

[0044] In summary, this embodiment not only utilizes the latent heat of phase change of the phase change heat-absorbing material 320 to absorb battery heat, but also uses the good thermal conductivity of silicone 310 to quickly transfer heat to the outer shell for heat dissipation, achieving the dual effect of heat dissipation and heat absorption.

[0045] In addition, the structure of this embodiment is simple, the manufacturing cost is low, and it does not require a complex liquid cooling system or air cooling system, making it widely applicable.

[0046] This embodiment also provides a lithium-ion battery, which includes a battery management system 20 and the heat dissipation structure 10 of the lithium-ion battery described above. The battery management system 20 is installed inside the battery housing 100 and electrically connected to the battery module 200. The battery management system 20 is located near the opening end of the battery housing 100 relative to the battery module 200. The potting height of the potting compound 300 is higher than the installation height of the battery management system 20.

[0047] The lithium-ion battery also includes a top cover 30 and a battery output connector 40. The battery output connector 40 is disposed on the top cover 30 and is electrically connected to the battery management system 20. The top cover 30 is disposed on the open end, and the upper surface of the potting compound 300 is attached to the lower surface of the top cover 30.

[0048] Please see Figure 1 , Figure 5 and Figure 6The lithium-ion battery also includes multiple fasteners 50. The inner side of the battery housing 100 is provided with multiple protruding posts 110. Each protruding post 110 is provided with a threaded hole 111. The top cover 30 is provided with multiple through holes 31. The number of through holes 31 and threaded holes 111 are the same and correspond one-to-one. A fastener 50 passes through a corresponding through hole 31 and is screwed into a corresponding threaded hole 111.

[0049] Understandably, at the location of the protruding post 110, the potting compound 300 forms a corresponding through groove 301.

[0050] Please see Figures 1 to 3 Based on the above, this embodiment further explains the installation principle of lithium-ion batteries as follows:

[0051] S100. First, place the battery module 200 inside the battery housing 100, then the battery management system...

[0052] After the battery module 200 is electrically connected to the battery module 200, the battery output connector 40 installed on the top cover 30 is finally electrically connected to the battery management system 20.

[0053] S200. Fill the potting compound 300 into the potting gap through the opening of the battery housing 100 until the height of the potting compound 300 is higher than the installation height of the battery module 200.

[0054] S300. Place the battery management system 20 on top of the potting compound 300, and continue pouring the potting compound 300 until the height of the potting compound 300 is higher than the installation height of the battery management system 20.

[0055] S400. Place the top cover 30 at the open end of the housing and lock the top cover 30 and the battery housing 100 together with the fastener 50.

[0056] The lithium battery installation method in this embodiment is simple and has the dual effects of heat dissipation and heat absorption, thus extending its service life.

[0057] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are 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. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0058] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A heat dissipation structure for a lithium-ion battery, characterized in that, The device includes a battery housing, a battery module, and a potting compound. One end of the battery housing is open, and the battery module is installed inside the battery housing through the opening. A potting gap is formed between the battery module and the battery housing, and the potting height of the potting compound is higher than the installation height of the battery module.

2. The heat dissipation structure of the lithium-ion battery as described in claim 1, characterized in that, The bottom surface of the battery module and the bottom surface of the housing form a first potting gap, the outer peripheral surface of the battery module and the inner side surface of the battery housing form a second potting gap, and the top surface of the battery module and the opening end of the battery housing form a third potting gap. The potting compound fills the first potting gap, the second potting gap and the third potting gap.

3. The heat dissipation structure of the lithium-ion battery as described in claim 2, characterized in that, The outer peripheral surface of the battery module is provided with multiple grooves, and the groove wall of each groove forms a fourth potting gap with the battery casing. The potting adhesive is also filled in the fourth potting gap.

4. The heat dissipation structure of the lithium-ion battery as described in any one of claims 1 to 3, characterized in that, The potting compound includes silicone and a phase change heat-absorbing material, with the silicone coating the outer surface of the phase change heat-absorbing material.

5. The heat dissipation structure of the lithium-ion battery as described in claim 4, characterized in that, The potting compound is made by mixing the silicone and the phase change heat-absorbing material in a preset ratio.

6. The heat dissipation structure of the lithium-ion battery as described in claim 4, characterized in that, The phase change heat-absorbing material is a paraffin phase change heat-absorbing material.

7. The heat dissipation structure of the lithium-ion battery as described in any one of claims 1 to 3, characterized in that, The battery casing is made of metal.

8. A lithium-ion battery, characterized in that, The invention includes a battery management system and a heat dissipation structure for a lithium-ion battery as described in any one of claims 1 to 7. The battery management system is installed inside the battery housing and electrically connected to the battery module. The battery management system is located near the opening end of the battery housing relative to the battery module. The potting height of the potting compound is higher than the installation height of the battery management system.

9. The lithium-ion battery as described in claim 8, characterized in that, It also includes a top cover and a battery output connector, wherein the battery output connector is disposed on the top cover and is electrically connected to the battery management system, the top cover is disposed on the opening end, and the upper surface of the potting compound is attached to the lower surface of the top cover.

10. The lithium-ion battery as described in claim 9, characterized in that, It also includes multiple fasteners. The inner side of the battery housing is provided with multiple protruding posts, each of which is provided with a threaded hole. The top cover is provided with multiple through holes. The number of through holes and threaded holes are the same and correspond one-to-one. One of the fasteners passes through a corresponding through hole and is screwed into a corresponding threaded hole.

Images