Quick-charge type lithium ion battery pack structure

Abstract

The utility model discloses a quick-charge type lithium ion battery pack structure which comprises a shell, a battery arrangement mechanism and single batteries are mounted in the shell, and a vertical sandwich plate and a transverse sandwich plate which are used for cooling stacking gaps of the single batteries are mounted on the battery arrangement mechanism. According to the utility model, heat in the stacking gaps among the single batteries is conveyed to the two ends and the top of the interior of the shell through the vertical sandwich plates and the transverse sandwich plates, so that the situation that the local heat of the single batteries is too high due to the stacking gaps is avoided; meanwhile, the fan exhausts heat on the top of the inner side of the shell outwards, and the liquid cooling box performs liquid cooling heat dissipation on heat on the two side surfaces of the shell, so that the heat in the shell is effectively controlled, the condition that the battery capacity is attenuated due to continuous increase of the heat in the fast charging process of the battery pack is avoided, and the service life of the battery pack is prolonged.

Description

Technical Field

[0001] This utility model relates to the field of lithium-ion battery pack technology, specifically to a fast-charging lithium-ion battery pack structure. Background Technology

[0002] A lithium-ion battery pack is a battery assembly composed of multiple lithium-ion battery cells connected in series and parallel. It boasts advantages such as high energy density, long lifespan, and a high voltage platform. The operation of a lithium-ion battery pack is based on the insertion and extraction of lithium ions between the positive and negative electrodes. During charging, lithium ions are extracted from the positive electrode material, move through the electrolyte to the negative electrode, and insert into the negative electrode material, while electrons flow from the positive electrode to the negative electrode. During discharging, lithium ions are extracted from the negative electrode material, move through the electrolyte to the positive electrode, and insert into the positive electrode material, while electrons flow from the negative electrode to the positive electrode, thus generating current. Electric vehicles are one of the important application areas for lithium-ion battery packs. With global attention to environmental protection and sustainable development, the electric vehicle market is growing rapidly, and the demand for high-performance, high-energy-density lithium-ion battery packs is constantly increasing.

[0003] Currently, during fast charging of lithium-ion battery packs, the internal heat dissipation mechanism can only dissipate heat for each battery pack as a whole. The individual battery cells inside the battery pack have poor heat dissipation efficiency due to their stacked arrangement. When the individual battery cells are charged with a large current in a short period of time, the heat generated increases significantly. The high temperature will accelerate the side reactions inside the individual battery cells, such as the decomposition of the SEI film and the decomposition of the positive electrode material, which will lead to the degradation of battery capacity and affect the battery life.

[0004] Therefore, a fast-charging lithium-ion battery pack structure is proposed to solve the above problems. Utility Model Content

[0005] 1. Technical problem to be solved by the utility model

[0006] To address the shortcomings of existing technologies, the purpose of this invention is to provide a fast-charging lithium-ion battery pack structure. This structure aims to solve the problem that, in the current technology, during fast charging, the internal heat dissipation mechanism of the battery pack can only dissipate heat for each battery as a whole. The individual battery cells within the pack have poor heat dissipation efficiency due to their stacked arrangement. Furthermore, the high current charging of individual cells in a short time significantly increases heat generation, and this high temperature accelerates side reactions within the battery cells, such as the decomposition of the SE I film and the decomposition of the positive electrode material, leading to battery capacity degradation and affecting battery lifespan.

[0007] 2. Technical Solution

[0008] To achieve the above objectives, this utility model provides the following technical solution:

[0009] A fast-charging lithium-ion battery pack structure includes a housing, inside which a battery arrangement mechanism and individual battery cells are installed. The battery arrangement mechanism is equipped with vertical and horizontal sandwich plates for heat dissipation between the stacked battery cells. Liquid cooling boxes for liquid cooling of the two sides of the housing are installed at both ends of the housing.

[0010] As a preferred embodiment of this utility model, the top of the housing has a circular hole, a fan is installed at the bottom inside the circular hole, a double-bladed check valve that rotates upwards to open is installed at the top inside the circular hole, a heat sink is installed at the top inside the housing, and a hollow cavity is formed between the top inside the housing and the top of the heat sink, which communicates with the interior of the circular hole.

[0011] As a preferred embodiment of this utility model, the vertical sandwich panel is installed at the bottom of the inner side of the shell, and the top heat dissipation vent of the vertical sandwich panel is close to the bottom of the heat dissipation plate. Four horizontal sandwich panels are installed vertically on both sides of the vertical sandwich panel. Honeycomb-shaped heat dissipation holes are opened on both sides of the vertical sandwich panel and the horizontal sandwich panel. The heat dissipation vent of the horizontal sandwich panel is in contact with the two inner sides of the shell.

[0012] As a preferred embodiment of this utility model, the battery cells are evenly installed on the top of each horizontal sandwich panel and the bottom of the inner side of the shell, and multiple support plates for supporting the battery cells are installed between the top and bottom of the inner side of the vertical sandwich panel and the horizontal sandwich panel.

[0013] As a preferred embodiment of this utility model, fins are evenly installed inside the liquid cooling box, a sealing plate is installed on the outer side of the liquid cooling box, the inside of the liquid cooling box shares a side with the shell, coolant is provided inside the liquid cooling box, a micro pump is installed inside one of the liquid cooling boxes, a liquid guide pipe is connected to the inlet and outlet ports of the micro pump, and the liquid guide pipe passes through the hollow cavity at the top of the inner side of the shell and connects to the inside of the other liquid cooling box.

[0014] As a preferred embodiment of this utility model, multiple temperature sensors are evenly installed on the heat sink. When the temperature value detected by the temperature sensor is greater than the set temperature, the fan and micro pump automatically start; otherwise, the fan and micro pump are in a closed state.

[0015] 3. Beneficial effects

[0016] Compared with the prior art, the beneficial effects of this utility model are:

[0017] This invention uses vertical and horizontal sandwich panels to transfer heat from the stacking gaps between battery cells to the inner ends and top of the casing, preventing excessive localized heat buildup in the battery cells due to the stacking gaps. At the same time, a fan exhausts heat from the top inside the casing to the outside, while a liquid cooling box dissipates heat from both sides of the casing. This effectively controls the heat inside the casing, preventing the battery pack from experiencing continuous heat buildup and capacity degradation during fast charging, thereby extending the battery pack's lifespan. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of a fast-charging lithium-ion battery pack according to the present invention.

[0019] Figure 2 This is an exploded view of the casing of a fast-charging lithium-ion battery pack according to this utility model;

[0020] Figure 3 This is a schematic diagram of the battery arrangement mechanism of a fast-charging lithium-ion battery pack according to the present invention.

[0021] In the diagram: 1. Housing; 11. Circular hole; 12. Fan; 13. Check valve; 14. Battery cell; 15. Heat sink; 16. Temperature sensor; 2. Battery arrangement mechanism; 21. Vertical sandwich panel; 22. Horizontal sandwich panel; 23. Heat dissipation hole; 24. Support plate; 3. Liquid cooling box; 31. Fins; 32. Micro pump; 33. Sealing plate. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0023] Example:

[0024] Please see Figure 1-3 This embodiment provides a fast-charging lithium-ion battery pack structure, including a housing 1. Inside the housing 1, a battery arrangement mechanism 2 and battery cells 14 are installed. The battery arrangement mechanism 2 is equipped with a vertical sandwich plate 21 and a horizontal sandwich plate 22 for heat dissipation between the stacked gaps of the battery cells 14. Liquid cooling boxes 3 for liquid cooling of the two sides of the housing 1 are installed at both ends of the housing 1. The battery cells 14 are installed on the battery arrangement mechanism 2. The stacked gaps between the battery cells 14 can transfer heat to avoid excessive local heat. At the same time, the liquid cooling boxes 3 can liquid cool the outer side of the housing 1, thereby greatly improving the heat dissipation efficiency inside the battery pack.

[0025] In this embodiment, as Figure 2 As shown, a circular hole 11 is provided on the top of the housing 1. A fan 12 is installed on the bottom inner side of the circular hole 11. A double-bladed check valve 13 that rotates upwards to open is installed on the top inner side of the circular hole 11. A heat sink 15 is installed on the top inner side of the housing 1. A hollow cavity is formed between the top inner side of the housing 1 and the top of the heat sink 15. This cavity is connected to the inside of the circular hole 11. The heat generated inside the housing 1 is transferred upwards to the heat sink 15. After the fan 12 is started, it exhausts the heat sink 15 to dissipate heat, thereby reducing the temperature of the top inner side of the housing 1.

[0026] In this embodiment, as Figure 2 and Figure 3 As shown, the vertical sandwich panel 21 is installed on the bottom inner side of the housing 1, and the top heat dissipation vent of the vertical sandwich panel 21 is close to the bottom of the heat dissipation plate 15. Four horizontal sandwich panels 22 are installed vertically on both sides of the vertical sandwich panel 21. Honeycomb-shaped heat dissipation holes 23 are opened on both sides of the vertical sandwich panel 21 and the horizontal sandwich panel 22. The heat dissipation vents of the horizontal sandwich panel 22 are in contact with the inner two sides of the housing 1. The battery cells 14 are evenly installed on the top of each horizontal sandwich panel 22 and on the bottom inner side of the housing 1. Multiple support plates 24 for supporting the battery cells 14 are installed between the top and bottom of the inner side of the vertical sandwich plate 21 and the horizontal sandwich plate 22. The battery cells 14 are separated by the vertical sandwich plate 21 and the horizontal sandwich plate 22. When heat is generated on the surface of the battery cell 14 that is in contact with the vertical sandwich plate 21 and the horizontal sandwich plate 22, the heat enters the interior of the vertical sandwich plate 21 and the horizontal sandwich plate 22 through the heat dissipation holes 23 and is transferred to the top and side surfaces of the inner side of the housing 1.

[0027] In this embodiment, as Figure 1 As shown, fins 31 are evenly installed inside the liquid cooling box 3, and a sealing plate 33 is installed on the outer side of the liquid cooling box 3. The interior of the liquid cooling box 3 shares a side with the shell 1. Coolant is stored inside the liquid cooling box 3. A micro pump 32 is installed inside one of the liquid cooling boxes 3. A liquid guide pipe is connected to the inlet and outlet ports of the micro pump 32, and the liquid guide pipe passes through the hollow cavity at the top of the inner side of the shell 1 and connects to the interior of the other liquid cooling box 3. The micro pump 32 inputs the coolant inside one liquid cooling box 3 into the interior of the other micro pump 32 to realize the circulation of coolant and improve the heat dissipation efficiency on both sides of the shell 1.

[0028] In this embodiment, as Figure 1 and Figure 2As shown, multiple temperature sensors 16 are evenly installed on the heat sink 15. When the temperature value detected by the temperature sensor 16 is higher than the set temperature, the fan 12 and the micro pump 32 will start automatically. Otherwise, the fan 12 and the micro pump 32 will be turned off. Adaptive heat dissipation control is achieved by monitoring the temperature inside the casing 1 to ensure the temperature of the battery cell 14 during fast charging.

[0029] Working principle: The battery cells 14 are separated by vertical sandwich plates 21 and horizontal sandwich plates 22. When heat is generated on the surfaces where the battery cells 14 are in contact with the vertical sandwich plates 21 and horizontal sandwich plates 22, the heat enters the interior of the vertical sandwich plates 21 and horizontal sandwich plates 22 through the heat dissipation holes 23, and is transferred to the inner top and side surfaces of the housing 1. At the same time, the temperature sensor 16 monitors the temperature of the heat dissipation plate 15. When the temperature value detected by the temperature sensor 16 is higher than the set temperature, the fan 12 and the micro pump 32 are automatically started. After the fan 12 starts, it exhausts the heat dissipation plate 15 to reduce the temperature of the inner top of the housing 1. The micro pump 32 inputs the coolant from one liquid cooling box 3 into the interior of another micro pump 32 to realize the circulation of coolant, improve the heat dissipation efficiency of the two sides of the housing 1, and effectively control the heat inside the housing. This avoids the battery pack from continuously increasing in heat during fast charging, which would cause the battery capacity to decrease, thereby improving the service life of the battery pack.

[0030] All technical features in this embodiment can be freely combined according to actual needs.

[0031] The above embodiments are preferred implementations of this utility model. In addition, this utility model can also be implemented in other ways. Any obvious substitutions without departing from the concept of this technical solution are within the protection scope of this utility model.

Claims

1. A fast-charging lithium-ion battery pack structure, comprising a casing (1), characterized in that: The housing (1) is equipped with a battery arrangement mechanism (2) and a battery cell (14). The battery arrangement mechanism (2) is equipped with a vertical sandwich plate (21) and a horizontal sandwich plate (22) for heat dissipation of the gap between the stacked battery cells (14). The housing (1) is equipped with a liquid cooling box (3) for liquid cooling of the two sides of the housing (1).

2. The fast-charging lithium-ion battery pack structure according to claim 1, characterized in that: The top of the housing (1) has a circular hole (11), a fan (12) is installed at the bottom inside the circular hole (11), a double-bladed check valve (13) that rotates upwards is installed at the top inside the circular hole (11), a heat sink (15) is installed at the top inside the housing (1), and a hollow cavity is formed between the top inside the housing (1) and the top of the heat sink (15), which communicates with the inside of the circular hole (11).

3. The fast-charging lithium-ion battery pack structure according to claim 1, characterized in that: The vertical sandwich panel (21) is installed on the bottom of the inner side of the shell (1), and the top heat dissipation port of the vertical sandwich panel (21) is close to the bottom of the heat dissipation plate (15). Four horizontal sandwich panels (22) are installed vertically on both sides of the vertical sandwich panel (21). Both sides of the vertical sandwich panel (21) and the horizontal sandwich panel (22) are provided with honeycomb-shaped heat dissipation holes (23). The heat dissipation port of the horizontal sandwich panel (22) is in contact with the two inner sides of the shell (1).

4. The fast-charging lithium-ion battery pack structure according to claim 1, characterized in that: The battery cells (14) are evenly installed on the top of each horizontal sandwich panel (22) and the bottom of the inner side of the housing (1). Multiple support plates (24) for supporting the battery cells (14) are installed between the top and bottom of the inner side of the vertical sandwich panel (21) and the horizontal sandwich panel (22).

5. The fast-charging lithium-ion battery pack structure according to claim 1, characterized in that: The liquid cooling box (3) has fins (31) evenly installed inside. A sealing plate (33) is installed on the outer side of the liquid cooling box (3). The interior of the liquid cooling box (3) shares a side with the shell (1). The interior of the liquid cooling box (3) contains coolant. One of the liquid cooling boxes (3) has a micro pump (32) installed inside. The inlet and outlet ports of the micro pump (32) are respectively connected to liquid guide pipes, and the liquid guide pipes pass through the hollow cavity at the top of the inner side of the shell (1) and connect to the interior of the other liquid cooling box (3).

6. The fast-charging lithium-ion battery pack structure according to claim 2, characterized in that: Multiple temperature sensors (16) are evenly installed on the heat sink (15). When the temperature value detected by the temperature sensor (16) is greater than the set temperature, the fan (12) and the micro pump (32) start automatically; otherwise, the fan (12) and the micro pump (32) are in the off state.

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