A battery pack with high power density and energy density

Abstract

The present invention relates to the technical field of battery packs, and discloses a battery pack with high power density and energy density, comprising: a battery housing and battery blocks. The battery blocks are provided on the inner wall of the bottom of the battery housing. An upper cover is provided on the top of the battery housing. An insulating plate is provided on the top of the battery blocks. A two-phase coolant tank is provided on one side of the inner wall of the battery housing. A cooling auxiliary tank is provided on one side of the inner wall of the battery housing, close to the two-phase coolant tank. A hollow cooling plate is provided between the battery blocks. An inlet liquid conduit and an outlet liquid conduit are provided on the top of the insulating plate. By absorbing a large amount of heat during the phase change process of the two-phase coolant and then conducting centralized heat dissipation, the present invention can significantly improve the thermal management ability of the battery, thereby ensuring that the battery can operate safely and effectively under various conditions. It can not only improve the charge and discharge efficiency, consistency and safety of the battery, but also extend the service life of the battery, thereby indirectly improving its energy density performance throughout the life cycle.

Description

Technical Field

[0001] The present invention relates to the technical field of battery packs, and particularly to a battery pack with high power density and energy density. Background Art

[0002] Energy density refers to the amount of energy that a battery can store per unit volume or per unit mass. It is usually expressed as Wh / L (watt-hour per liter) for volume energy density and Wh / kg (watt-hour per kilogram) for mass energy density. High energy density means that the battery can store more energy in a smaller space or with a lighter weight, which is crucial for applications that need to run for a long time without frequent charging; Power density refers to the maximum power that a battery can provide per unit volume or per unit mass. It is usually expressed as W / L (watt per liter) for volume power density and W / kg (watt per kilogram) for mass power density. High power density means that the battery can quickly release a large amount of energy, which is very important for applications that need to provide high power in a short time, such as the instant acceleration of an electric vehicle or the use of power tools.

[0003] The cooling system of the battery is crucial for the energy density and power density performance of the battery. Excessive temperature will accelerate battery aging and reduce its energy density. The temperature of the battery not only affects the charge and discharge efficiency, consistency and safety of the battery, but also the service life of the battery, thus directly or indirectly affecting the energy density performance of the battery throughout its life cycle. Therefore, a battery pack with high power density and energy density is provided, which can perform good battery thermal management, thereby ensuring the charge and discharge efficiency, consistency and safety of the battery, and can also extend the service life of the battery, thereby indirectly improving its energy density performance throughout its life cycle. Summary of the Invention

[0004] The purpose of the present invention is to provide a battery pack with high power density and energy density to solve the problems raised in the above background art.

[0005] To achieve the above object, the present invention provides the following technical solution: A battery pack with high power density and energy density, comprising: a battery housing and battery blocks. The inner wall of the bottom of the battery housing is provided with battery blocks, the top of the battery housing is provided with an upper cover, the top of the battery blocks is provided with an insulating plate, one side of the inner wall of the battery housing is provided with a two-phase coolant tank, and one side of the inner wall of the battery housing near the two-phase coolant tank is provided with a cooling auxiliary tank. There are several battery blocks, and a hollow cooling plate is provided between the battery blocks. The top of the insulating plate is provided with an inlet conduit and an outlet conduit. The inlet conduit is connected to the inlet end of the hollow cooling plate through a hose, and the outlet conduit is connected to the outlet end of the hollow cooling plate through a hose. A circulating inlet pipe is communicated above the inlet conduit, and a circulating outlet pipe is communicated above the outlet conduit. One end of the circulating inlet pipe communicates with the two-phase coolant tank. One side of the inner wall of the bottom of the cooling auxiliary tank is provided with a lower pipe, a condensing pipe is provided on one side of the lower pipe, the upper half of the inner wall of the cooling auxiliary tank is provided with an upper pipe, the upper pipe is connected to the condensing pipe, one end of the upper pipe is connected with an upper connecting pipe, and one end of the upper connecting pipe is connected with the circulating outlet pipe. One end of the lower pipe communicates with the upper half of the two-phase coolant tank.

[0006] As a further description of the present invention, one end of the lower pipe is provided with a connecting pipe, one end of the connecting pipe communicates with the inside of the upper half of the two-phase coolant tank, and one end of the connecting pipe is connected with a circulating pump.

[0007] As a further description of the present invention, handles are provided on both sides of the outer wall of the top of the upper cover, and external electrodes are provided on both sides of the top of the upper cover. The external electrodes are electrically connected to the battery blocks.

[0008] As a further description of the present invention, a horizontal support plate and a vertical support plate are provided on the inner wall of the battery housing outside the battery blocks. The horizontal support plate and the vertical support plate limit and fix the battery blocks.

[0009] As a further description of the present invention, a liquid outlet pump is provided on one side of the outer wall of the bottom of the two-phase coolant tank. One end of the liquid outlet of the liquid outlet pump is connected with a liquid outlet pipe, and one end of the liquid outlet pipe is connected with the circulating inlet pipe.

[0010] As a further description of the present invention, the cooling auxiliary tank is filled with coolant, and the coolant covers the condensing pipe.

[0011] As a further description of the present invention, several battery blocks form a battery pack, and the positive and negative electrodes of the series-connected battery pack are respectively electrically connected to the two external electrodes.

[0012] As a further description of the present invention, the two-phase coolant tank is filled with two-phase coolant.

[0013] As a further illustration of the present invention, one side of the cooling auxiliary water tank is in contact with the battery housing, and a heat dissipation plate is provided on the side where the cooling auxiliary water tank is in contact with the battery housing.

[0014] As a further illustration of the present invention, thermal conductive silicone grease is applied between the outer wall of the hollow cooling plate and the outer wall of the battery block.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0016] In the present invention, by providing the battery block, the two-phase coolant tank, the cooling auxiliary water tank and the hollow cooling plate, when using a battery pack with high power density and energy density, the two-phase coolant in the two-phase coolant tank is sent into the liquid outlet pipe by the liquid outlet pump, and then the two-phase coolant is sent into the circulating inlet pipe through the liquid outlet pipe. Finally, it enters the hollow cooling plate through the hose between the circulating inlet pipe and the hollow cooling plate. After the two-phase coolant enters the hollow cooling plate, it exchanges heat with the heat generated by the battery. The heat of the battery converts the two-phase coolant from a liquid to a gas, and this process absorbs heat. Then the gaseous coolant enters the upper pipeline through the liquid outlet conduit, the circulating liquid outlet pipe and the upper connecting pipe. Subsequently, the gaseous coolant enters the condensing pipe. The spirally arranged condensing pipe enables the gaseous coolant to fully exchange heat with the coolant in the cooling auxiliary water tank, so that the gaseous coolant is re-condensed into a liquid, and this process releases heat. Finally, centralized heat dissipation is carried out through the cooling auxiliary water tank and the battery housing. The condensed coolant re-enters the two-phase coolant tank through the lower pipeline, the circulating pump and the connecting pipeline for re-circulation;

[0017] In the present invention, by absorbing a large amount of heat during the phase change process of the two-phase coolant and then performing centralized heat dissipation, the thermal management ability of the battery can be significantly improved, thereby ensuring that the battery can operate safely and effectively under various conditions. It can not only improve the charge and discharge efficiency, consistency and safety of the battery, but also extend the service life of the battery, thereby indirectly improving its energy density performance during the entire life cycle. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a perspective view of a battery pack with high power density and energy density according to the present invention;

[0019] Figure 2 is a perspective view of another angle of a battery pack with high power density and energy density according to the present invention;

[0020] Figure 3 is a perspective view of the internal structure of a battery pack with high power density and energy density according to the present invention;

[0021] Figure 4 is a perspective view of the internal structure of another angle of a battery pack with high power density and energy density according to the present invention;

[0022] Figure 5 The front view of the internal structure of a battery pack with high power density and energy density according to the present invention;

[0023] Figure 6 The schematic diagram of the connection structure of the two-phase coolant tank of a battery pack with high power density and energy density according to the present invention;

[0024] Figure 7 The schematic diagram of another perspective of the connection structure of the two-phase coolant tank of a battery pack with high power density and energy density according to the present invention;

[0025] Figure 8 The front view of the connection structure of the two-phase coolant tank of a battery pack with high power density and energy density according to the present invention;

[0026] Figure 9 The schematic diagram of another perspective of the connection structure of the two-phase coolant tank of a battery pack with high power density and energy density according to the present invention;

[0027] Figure 10 The schematic diagram of the partial sectional structure of a battery pack with high power density and energy density according to the present invention.

[0028] In the figure: 1. Battery housing; 2. Upper cover; 3. Handle; 4. External electrode; 5. Battery block; 6. Horizontal support plate; 7. Vertical support plate; 8. Two-phase coolant tank; 9. Circulation pump; 10. Connecting pipe; 11. Cooling auxiliary water tank; 12. Upper pipe; 13. Condensing pipe; 14. Upper connecting pipe; 15. Lower pipe; 16. Liquid outlet pump; 17. Liquid outlet pipe; 18. Circulation inlet pipe; 19. Insulating plate; 20. Inlet liquid conduit; 21. Outlet liquid conduit; 22. Circulation outlet liquid pipe; 23. Hollow cooling plate. Specific embodiments

[0029] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0030] Please refer to Figures 1 - 10 , the present invention provides a technical solution: a battery pack with high power density and energy density, including: a battery housing 1 and a battery block 5, the battery block 5 is provided on the inner wall of the bottom of the battery housing 1, the upper cover 2 is provided on the top of the battery housing 1, the insulating plate 19 is provided on the top of the battery block 5, the two-phase coolant tank 8 is provided on one side of the inner wall of the battery housing 1, the cooling auxiliary water tank 11 is provided on one side of the inner wall of the battery housing 1 near the two-phase coolant tank 8, there are a plurality of battery blocks 5, and the hollow cooling plate 23 is provided between the battery blocks 5.

[0031] The top of the insulating plate 19 is provided with a liquid inlet conduit 20 and a liquid outlet conduit 21. The liquid inlet conduit 20 is connected to the liquid inlet end of the hollow cooling plate 23 through a hose, and the liquid outlet conduit 21 is connected to the liquid outlet end of the hollow cooling plate 23 through a hose. Above the liquid inlet conduit 20, there is a circulating liquid inlet pipe 18 communicating, and above the liquid outlet conduit 21, there is a circulating liquid outlet pipe 22 communicating. One end of the circulating liquid inlet pipe 18 communicates with the two-phase coolant tank 8. On one side of the bottom inner wall of the cooling secondary tank 11, there is a lower pipe 15, and on one side of the lower pipe 15, there is a condenser pipe 13. On the upper half inner wall of the cooling secondary tank 11, there is an upper pipe 12, and the upper pipe 12 is connected to the condenser pipe 13. One end of the upper pipe 12 is connected with an upper connecting pipe 14, and one end of the upper connecting pipe 14 is connected to the circulating liquid outlet pipe 22. One end of the lower pipe 15 communicates with the upper half of the two-phase coolant tank 8. The two-phase coolant in the two-phase coolant tank 8 is sent into the liquid outlet pipe 17 by the liquid outlet pump 16, and then the two-phase coolant is sent into the circulating liquid inlet pipe 18 through the liquid outlet pipe 17. Finally, it enters the hollow cooling plate 23 through the hose between the circulating liquid inlet pipe 18 and the hollow cooling plate 23. After the two-phase coolant enters the hollow cooling plate 23, it exchanges heat with the heat generated by the battery. The heat of the battery converts the two-phase coolant from a liquid to a gas, and this process absorbs heat. Then the gaseous coolant enters the upper pipe 12 through the liquid outlet conduit 21, the circulating liquid outlet pipe 22, and the upper connecting pipe 14. Subsequently, the gaseous coolant enters the condenser pipe 13. The spirally arranged condenser pipe 13 enables the gaseous coolant to fully exchange heat with the coolant in the cooling secondary tank 11, causing the gaseous coolant to re-condense into a liquid, and this process releases heat. Finally, centralized heat dissipation is carried out through the cooling secondary tank 11 and the battery housing 1. The condensed coolant re-enters the two-phase coolant tank 8 through the lower pipe 15, the circulating pump 9, and the connecting pipe 10 for re-circulation. The entire system forms a closed-loop cycle, ensuring that the coolant can continuously circulate in the system, thereby continuously absorbing heat from the battery and releasing heat in the condenser. By exchanging heat between the gaseous coolant and the coolant in the cooling secondary tank in the condenser, heat can be effectively transferred from the battery to the environment. The components in the system are carefully arranged to minimize space occupancy and maximize heat exchange efficiency.

[0032] One end of the lower pipe 15 is provided with a connecting pipe 10. One end of the connecting pipe 10 communicates with the inside of the upper half of the two-phase coolant tank 8, and one end of the connecting pipe 10 is connected with a circulating pump 9. The condensed coolant re-enters the two-phase coolant tank 8 through the lower pipe 15, the circulating pump 9, and the connecting pipe 10 for re-circulation.

[0033] On both sides of the outer wall of the top of the upper cover 2, there are handles 3. On both sides of the top of the upper cover 2, there are external electrodes 4, and the external electrodes 4 are electrically connected to the battery blocks 5. A number of battery blocks 5 form a battery pack, and the positive and negative poles of the series-connected battery pack are respectively electrically connected to the two external electrodes 4. The upper cover 2 is the top component of the battery pack, which is used to enclose the battery pack and protect the internal components from the external environment. It not only provides physical protection but also plays a sealing role to prevent moisture, dust, etc. from entering the battery interior. The design of the handle 3 enables users to conveniently lift the battery pack, especially in the case of needing to move the battery from one place to another; the external electrodes 4 are an essential part of the power transmission between the battery pack and external devices, and through these electrodes, the electrical energy of the battery can be output to the devices that need power supply.

[0034] On the inner wall of the battery housing 1, there are horizontal support plates 6 and vertical support plates 7 on the outside of the battery blocks 5. The horizontal support plates 6 and vertical support plates 7 limit and fix the battery blocks 5. The horizontal support plates 6 and vertical support plates 7 act together on the battery blocks 5 to ensure the stable position of the battery blocks 5 inside the battery pack. Even when the vehicle encounters bumps or turns during driving, they can remain stable. By restricting the displacement of the battery blocks 5, the friction and collision between the battery blocks 5 and between the battery blocks 5 and the battery pack housing can be reduced, thereby reducing the risk of short circuit and thermal runaway.

[0035] On one side of the outer wall at the bottom of the two-phase coolant tank 8, there is a liquid outlet pump 16. One end of the liquid outlet of the liquid outlet pump 16 is connected to a liquid outlet pipe 17, and one end of the liquid outlet pipe 17 is connected to a circulating inlet pipe 18. The two-phase coolant in the two-phase coolant tank 8 is sent into the liquid outlet pipe 17 through the liquid outlet pump 16, then the two-phase coolant is sent into the circulating inlet pipe 18 through the liquid outlet pipe 17, and finally enters the hollow cooling plate 23 through the hose between the circulating inlet pipe 18 and the hollow cooling plate 23.

[0036] The cooling auxiliary water tank 11 is filled with coolant, and the coolant submerges the condensing pipe 13. The two-phase coolant tank 8 is filled with two-phase coolant. The spirally arranged condensing pipe 13 enables the gaseous coolant to fully exchange heat with the coolant in the cooling auxiliary water tank 11, making the gaseous coolant re-condense into a liquid. This process releases heat, and finally, centralized heat dissipation is carried out through the cooling auxiliary water tank 11 and the battery housing 1. The spiral-shaped condensing pipe design can increase the contact area between the coolant and the coolant. The condensing pipe is used for the condensation process of the gaseous coolant to change it from a gaseous state back to a liquid state. The spiral design can maximize the heat exchange area between the gaseous coolant and the coolant, thereby improving the condensation efficiency.

[0037] One side of the cooling auxiliary water tank 11 is in contact with the battery housing 1, and a heat dissipation plate is provided on the side where the cooling auxiliary water tank 11 is in contact with the battery housing 1. By providing a heat dissipation plate between the cooling auxiliary water tank 11 and the battery housing 1, the heat exchange area is increased, thereby improving the heat exchange efficiency of the cooling system. The design of the heat dissipation plate helps to transfer heat from the cooling auxiliary water tank 11 to the battery housing 1 more quickly, and then dissipate heat to the surrounding environment through the battery housing 1. By directly using the battery housing 1 as a heat dissipation medium, the structure of the overall cooling system is simplified and the cost is reduced.

[0038] Thermal conductive silicone grease is applied between the outer wall of the hollow cooling plate 23 and the outer wall of the battery block 5. The thermal conductive silicone grease can fill the tiny gaps between the contact surfaces, reduce the thermal resistance, ensure good contact between the two, and improve the heat transfer efficiency.

[0039] When the battery pack with high power density and energy density is in use, the two-phase coolant in the two-phase coolant tank 8 is sent into the liquid outlet pipe 17 by the liquid outlet pump 16, then the two-phase coolant is sent into the circulating inlet pipe 18 through the liquid outlet pipe 17, and finally enters the hollow cooling plate 23 through the hose between the circulating inlet pipe 18 and the hollow cooling plate 23. After the two-phase coolant enters the hollow cooling plate 23, it exchanges heat with the heat generated by the battery. The heat of the battery changes the two-phase coolant from liquid to gas, and this process absorbs heat. Then the gaseous coolant enters the upper pipe 12 through the liquid outlet conduit 21, the circulating liquid outlet pipe 22, and the upper connecting pipe 14. Subsequently, the gaseous coolant enters the condensing pipe 13. The spirally arranged condensing pipe 13 enables the gaseous coolant to fully exchange heat with the coolant in the cooling auxiliary water tank 11, so that the gaseous coolant is re-condensed into a liquid, and this process releases heat. Finally, it is centrally dissipated through the cooling auxiliary water tank 11 and the battery housing 1. The condensed coolant re-enters the two-phase coolant tank 8 through the lower pipe 15, the circulating pump 9, and the connecting pipe 10 for re-circulation;

[0040] In the present invention, by absorbing a large amount of heat during the phase change process of the two-phase coolant and then performing centralized heat dissipation, the thermal management ability of the battery can be significantly improved, thereby ensuring that the battery can operate safely and effectively under various conditions. It can not only improve the charge and discharge efficiency, consistency and safety of the battery, but also extend the service life of the battery, thereby indirectly improving its energy density performance during the entire life cycle.

[0041] Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

Claims

1. A battery pack with high power density and energy density, comprising: Battery housing (1) and battery block (5), characterized in that: a battery block (5) is provided on the inner wall of the bottom of the battery housing (1), an upper cover (2) is provided on the top of the battery housing (1), an insulating plate (19) is provided on the top of the battery block (5), a two-phase coolant tank (8) is provided on one side of the inner wall of the battery housing (1), and a cooling auxiliary tank (11) is provided on one side of the inner wall of the battery housing (1) close to the two-phase coolant tank (8). There are several battery blocks (5), a hollow cooling plate (23) is provided between the battery blocks (5), a liquid inlet conduit (20) and a liquid outlet conduit (21) are provided on the top of the insulating plate (19), the liquid inlet conduit (20) is connected to the liquid inlet end of the hollow cooling plate (23) through a hose, the liquid outlet conduit (21) is connected to the liquid outlet end of the hollow cooling plate (23) through a hose, a circulating liquid inlet pipe (18) is communicated above the liquid inlet conduit (20), a circulating liquid outlet pipe (22) is communicated above the liquid outlet conduit (21), one end of the circulating liquid inlet pipe (18) communicates with the two-phase coolant tank (8), one side of the inner wall of the bottom of the cooling auxiliary tank (11) is provided with a lower pipe (15), a condensation pipe (13) is provided on one side of the lower pipe (15), an upper pipe (12) is provided on the inner wall of the upper half of the cooling auxiliary tank (11), the upper pipe (12) is connected to the condensation pipe (13), one end of the upper pipe (12) is connected with an upper connecting pipe (14), one end of the upper connecting pipe (14) is connected with the circulating liquid outlet pipe (22), and one end of the lower pipe (15) communicates with the upper half of the two-phase coolant tank (8); One end of the lower pipe (15) is provided with a connecting pipe (10), one end of the connecting pipe (10) communicates with the inside of the upper half of the two-phase coolant tank (8), and one end of the connecting pipe (10) is connected with a circulating pump (9); One side of the outer wall of the bottom of the two-phase coolant tank (8) is provided with a liquid outlet pump (16), the liquid outlet of the liquid outlet pump (16) is connected with a liquid outlet pipe (17), and one end of the liquid outlet pipe (17) is connected with the circulating liquid inlet pipe (18); The cooling auxiliary tank (11) is filled with a coolant, and the coolant covers the condensation pipe (13); The two-phase coolant tank (8) is filled with a two-phase coolant.

2. A high-power density and energy density battery pack according to claim 1, characterized in that: On both sides of the outer wall of the top of the upper cover (2), there are handles (3), and on both sides of the top of the upper cover (2), there are external electrodes (4), and the external electrodes (4) are electrically connected to the battery blocks (5).

3. A high-power-density and high-energy-density battery pack according to claim 1, characterized in that: On the inner wall of the battery housing (1) outside the battery block (5), there are a horizontal support plate (6) and a vertical support plate (7), and the horizontal support plate (6) and the vertical support plate (7) limit and fix the battery block (5).

4. A high-power density and energy density battery pack according to claim 2, characterized in that: Several battery blocks (5) form a battery pack, and the positive and negative electrodes of the series-connected battery pack are electrically connected to the two external electrodes (4) respectively.

5. A high-power density and energy density battery pack according to claim 1, characterized in that: One side of the cooling auxiliary tank (11) is in contact with the battery housing (1), and a heat dissipation plate is provided on the side of the cooling auxiliary tank (11) in contact with the battery housing (1).

6. A high power density and energy density battery pack according to claim 1, characterized in that: Thermal conductive silicone grease is applied between the outer wall of the hollow cooling plate (23) and the outer wall of the battery block (5).

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