An energy storage battery pack

Abstract

The utility model relates to the field of domestic battery pack heat management, concretely relates to a kind of energy storage battery pack. Including battery pack shell, its top is equipped with battery pack upper cover;Battery module is set in the battery pack shell inside, including multiple electric core;Phase change material is filled in the battery module inside, and the electric core is covered;Radiating fin plate is installed on the battery pack shell, including inside fin and outside fin, the inside fin is inserted in the phase change material, and the outside fin is exposed to outside air. The energy storage battery pack is cooled by phase change material, without relying on active temperature control strategy, significantly improve the reliability of the system and reduce energy consumption.

Description

Technical Field

[0001] This utility model relates to the field of thermal management of household battery packs, specifically to an energy storage battery pack. Background Technology

[0002] In recent years, the energy storage industry has developed rapidly. Residential energy storage, as an energy storage system for home users, is usually used in conjunction with residential photovoltaic systems to store excess electricity. When needed, it is powered by batteries to reduce electricity costs and ensure stable power supply. It occupies an important position in the global energy storage market.

[0003] With the rapid pace of technological iteration, residential energy storage cells are constantly evolving towards larger capacity and higher energy density, leading to increasing heat generation within the cells. Limited by cost, size, and application scenarios, residential energy storage battery packs currently typically employ natural heat dissipation through the outer casing. However, heat dissipation becomes extremely difficult in high-temperature environments, causing the batteries to frequently operate at high temperatures, impacting performance and lifespan. This is especially true for high-energy-density cells, where traditional natural heat dissipation methods are insufficient. Even with naturally cooled battery packs featuring heat sinks, heat easily escapes to the outside environment in low-temperature environments, resulting in slow battery heating. Utility Model Content

[0004] This utility model provides an energy storage battery pack, the purpose of which is to solve the problems of battery overheating and large temperature difference in the existing thermal management technology in the residential energy storage industry.

[0005] To achieve the above objectives, the first aspect of this utility model provides an energy storage battery pack, comprising: The battery pack casing has a battery pack cover on top; A battery module, disposed inside the battery pack housing, includes multiple battery cells; Phase change material is filled inside the battery module and covers the battery cell; A heat dissipation fin plate is installed on the battery pack housing and includes inner fins and outer fins. The inner fins are inserted into the phase change material, and the outer fins are exposed to the outside air.

[0006] Furthermore, the energy storage battery pack also includes a silicone heating film, which is adhered to the bottom of the battery cell.

[0007] Furthermore, the heat dissipation fin plate is a one-piece molded structure, the inner fins are oblique fins, and the outer fins are vertical fins.

[0008] Furthermore, the battery cells are separated by insulating shock-absorbing foam and fixed together by end plates and steel strips to form an integral structure.

[0009] Furthermore, the phase change material is a paraffin-based composite solid-liquid phase change material.

[0010] Furthermore, the phase change material has a phase change temperature of 25°C to 40°C and a latent heat of phase change of 150 kJ / kg to 250 kJ / kg.

[0011] Furthermore, the internal fins are one of corrugated, spiral, or perforated fins.

[0012] Furthermore, the battery pack outer shell and the battery pack top cover adopt a stackable convex-concave structure design.

[0013] Furthermore, the battery pack cover is provided with a carrying handle.

[0014] Furthermore, the battery module includes two sub-modules, each of which includes multiple battery cells. The battery cells of the two sub-modules are connected in series via aluminum foil.

[0015] The beneficial effects of this utility model are: Compared with existing technologies, the energy storage battery pack provided by this utility model uses phase change material to fill the battery module and cover the battery cell, utilizing its latent heat of phase change to absorb a large amount of heat, significantly improving the temperature uniformity and heat dissipation capacity of the battery pack; at the same time, the inner fins of the heat dissipation fin plate are inserted into the phase change material to increase the heat exchange area, and the outer fins enhance the heat dissipation efficiency, effectively reducing the average temperature and temperature difference during battery charging and discharging; thus comprehensively solving the problems of battery overheating and large temperature difference. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below.

[0017] Figure 1 This is a schematic diagram of a battery pack structure disclosed in an embodiment of the present utility model.

[0018] Figure 2 This is an exploded view of a battery pack structure disclosed in an embodiment of this utility model.

[0019] Figure 3 This is an exploded view of a battery pack module disclosed in an embodiment of this utility model.

[0020] Figure 4 This is an exploded view of a battery pack module disclosed in an embodiment of this utility model.

[0021] Reference numerals: 1. Battery pack top cover; 2. Battery module; 3. Heat sink fin plate; 4. Battery pack outer shell; 101. Handle structure; 201. Aluminum bar; 202. End plate; 203. Shock-absorbing and cushioning foam; 204. Phase change material; 205. Silicone heating film; 206. Steel strip; 207. Battery cell; 301. Inner fin; 302. Outer fin. Detailed Implementation

[0022] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0023] A schematic diagram of the energy storage battery pack involved in this utility model is shown below. Figure 1 As shown, the exploded view of the main structure of the energy storage battery pack is as follows: Figure 2 As shown, it includes a battery pack cover 1, a battery module 2, a heat dissipation fin plate 3, and a battery pack outer shell 4.

[0024] like Figure 3 As shown, the battery pack casing 4 constitutes the main structure of the energy storage battery pack, and its top is equipped with an openable battery pack cover 1. Inside, there is a battery module 2, which includes multiple battery cells 207, and phase change material 204 is filled around the battery cells 207 to cover the side of each battery cell 207, which plays a role in heat storage and temperature equalization.

[0025] like Figure 2 and Figure 4 As shown, the heat dissipation fin plate 3 is fixedly mounted on the battery pack casing 4. Its inner fins 301 extend into the phase change material 204 to enhance heat conduction, while the outer fins 302 are exposed to the air, utilizing natural convection to enhance heat dissipation. This structure effectively improves the overall thermal management performance, taking into account both high-temperature heat dissipation and low-temperature insulation requirements.

[0026] See Figure 3 The energy storage battery pack also features a silicone heating film 205, attached to the bottom of the battery cell 207, for heating the battery in low-temperature environments. To further optimize heating uniformity, the silicone heating film 205 has a heating power 5% to 15% higher in the area near the end plates 202 on both sides than in the middle of the module. This differentiated power design is designed to address the phenomenon that heat dissipation is greater at the ends and the temperature is usually lower in actual heat conduction, effectively compensating for heat loss at the ends, thereby significantly improving the temperature consistency of the entire battery module 2 under low-temperature heating conditions.

[0027] Preferably, the heat dissipation fin plate 3 adopts an integral molding structure. Its inner fins 301 are designed as slanted fins that extend into the phase change material 204 to effectively increase the heat exchange area and enhance heat conduction; the outer fins 302 adopt a vertical fin layout to improve heat dissipation efficiency by utilizing natural air convection and accelerate the diffusion of heat into the environment.

[0028] Furthermore, the thickness and spacing of the heat dissipation fin plate 3 provided in this solution can be modified and increased or decreased according to the actual situation. The inner fins 301 can be selected to adopt fin structures with complex geometric shapes such as corrugations, spirals or perforations to adapt to different heat dissipation requirements.

[0029] Preferably, insulating shock-absorbing foam 203 is provided between the battery cells 207 to provide isolation and cushioning. The entire battery module 2 is secured by end plates 202 at both ends and a surrounding steel strip 206, forming a stable overall structure to prevent displacement and deformation caused by vibration or impact. The battery module 2 consists of two sub-modules, each containing several battery cells 207. The two sub-modules are connected in series by an aluminum bar 201 to form a complete electrical circuit. In this embodiment, the battery pack contains 32 battery cells 207, divided into two modules, with 16 battery cells 207 per module. Of course, the battery packing method and cell capacity provided in this solution can be selected and changed according to actual conditions.

[0030] Preferably, the phase change material 204 used in this solution is a paraffin-based composite solid-liquid phase change material, but other suitable materials can also be selected according to actual application requirements. Its phase change temperature is preferably between 25℃ and 40℃, and its latent heat of phase change ranges from 150 to 250 kJ / kg, which can well match the battery's operating temperature range and efficiently absorb the heat generated during charging and discharging. Furthermore, the phase change material 204 has a thermal conductivity of less than 0.1 W / (m·K) in its low-temperature solidification state. This characteristic helps reduce heat loss during the heating stage, thereby improving thermal management efficiency in low-temperature environments.

[0031] Preferably, the battery pack outer shell 4 and the battery pack top cover 1 adopt a convex-concave mating structure design, which facilitates the stable stacking of multiple battery pack units and saves storage and usage space. In addition, a carrying handle 101 is provided on the top of the battery pack top cover 1 to facilitate user handling and movement.

[0032] This invention achieves passive heat dissipation by employing phase change material 204, eliminating the need for active temperature control strategies, significantly improving system reliability and reducing energy consumption. The phase change material 204 fills the interior of the battery module 2, effectively improving the temperature uniformity of the battery pack and reducing the overall operating temperature. Simultaneously, the heat dissipation fin plate 3 employs a composite structure where inner fins 301 (slanted fins) are inserted into the phase change material 204, and outer fins 302 (vertical fins) conform to air convection, efficiently dissipating heat to the external environment and significantly reducing the average temperature of the battery during charging and discharging. Furthermore, the use of a silicone heating film 205 with differentiated power distribution enhances heating in the end region to reduce temperature differences, and utilizes the low thermal conductivity of the phase change material 204 after low-temperature solidification to effectively reduce heat loss and lower low-temperature heating energy consumption, resulting in a more efficient and balanced thermal management effect overall.

[0033] In the above embodiments of this utility model, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0034] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. An energy storage battery pack, characterized in that, include: The battery pack casing (4) has a battery pack cover (1) on its top. The battery module (2) is disposed inside the battery pack housing (4) and includes multiple battery cells (207). Phase change material (204) is filled inside the battery module (2) and covers the battery cell (207). A heat dissipation fin plate (3) is installed on the battery pack housing (4) and includes an inner fin (301) and an outer fin (302). The inner fin (301) is inserted into the phase change material (204), and the outer fin (302) is exposed to the outside air.

2. The energy storage battery pack as described in claim 1, characterized in that, The energy storage battery pack also includes a silicone heating film (205), which is attached to the bottom of the battery cell (207).

3. The energy storage battery pack as described in claim 1, characterized in that, The heat dissipation fin plate (3) is an integrally formed structure, the inner fin (301) is an oblique fin, and the outer fin (302) is a vertical fin.

4. The energy storage battery pack as described in claim 1, characterized in that, The cells (207) are separated by insulating shock-absorbing foam (203) and fixed to form an integral structure by end plates (202) and steel strips (206).

5. The energy storage battery pack as described in claim 1, characterized in that, The phase change material (204) is a paraffin-based composite solid-liquid phase change material.

6. The energy storage battery pack as described in claim 5, characterized in that, The phase change material (204) has a phase change temperature of 25°C to 40°C and a latent heat of phase change of 150 kJ / kg to 250 kJ / kg.

7. The energy storage battery pack as described in claim 1, characterized in that, The inner fins are one of corrugated, spiral, or perforated fins.

8. The energy storage battery pack as described in claim 1, characterized in that, The battery pack outer shell (4) and the battery pack top cover (1) adopt a stackable convex-concave structure design.

9. The energy storage battery pack as described in claim 1 or 8, characterized in that, The battery pack cover (1) is provided with a handle structure (101).

10. The energy storage battery pack as described in claim 1, characterized in that, The battery module (2) includes two sub-modules, each of which includes multiple cells (207). The cells (207) between the two sub-modules are connected by aluminum bars (201) to connect the cells (207) of the two sub-modules in series.

Images