Battery pack with high power density and energy density

Abstract

The invention relates to the technical field of battery packs and discloses a high-power-density and high-energy-density battery pack which comprises a battery shell and a battery block, the battery block is arranged on the inner wall of the bottom of the battery shell, an upper cover is arranged on the top of the battery shell, an insulating plate is arranged on the top of the battery block, and a two-phase cooling liquid box is arranged on one side of the inner wall of the battery shell. A cooling auxiliary water tank is arranged on one side, close to one side of the two-phase cooling liquid tank, of the inner wall of the battery shell, a hollow cooling plate is arranged between the battery blocks, and a liquid inlet guide pipe and a liquid outlet guide pipe are arranged at the top of an insulating plate. The thermal management capability of the battery can be remarkably improved, so that the battery can safely and effectively operate under various conditions, the charging and discharging efficiency, the consistency and the safety of the battery can be improved, the service life of the battery can be prolonged, and the energy density performance of the battery in the whole life cycle can be indirectly improved.

Description

Technical Field

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

[0002] Energy density refers to the amount of energy that can be stored in a battery per unit volume or per unit mass. Volume energy density is usually expressed in Wh / L (watt-hours per liter), and mass energy density is expressed in Wh / kg (watt-hours per kilogram). High energy density means that the battery can store more energy in a smaller space or at a lighter weight, which is critical for applications that need to run for a long time and cannot be charged frequently; power density refers to the maximum power that a battery can provide per unit volume or per unit mass. Volume power density is usually expressed in W / L (watts per liter), and mass power density is expressed in W / kg (watts per kilogram). High power density means that the battery can release a large amount of energy quickly, which is very important for applications that require high power in a short period of time, such as the instant acceleration of starting an electric car or the use of power tools.

[0003] The battery cooling system is crucial to the battery's energy density and power density performance. Excessive temperature will accelerate battery aging and reduce its energy density. The battery temperature not only affects the battery's charging and discharging efficiency, consistency and safety, and the battery's service life, thereby directly or indirectly affecting the battery's energy density performance throughout its life cycle. To this end, a high power density and energy density battery pack is provided that can perform good battery thermal management, thereby ensuring the battery's charging and discharging efficiency, consistency and safety, and can also extend the battery's service life, thereby indirectly improving its energy density performance throughout its life cycle. Summary of the invention

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

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a high power density and energy density battery pack, comprising: a battery housing and a battery block, wherein the inner wall at the bottom of the battery housing is provided with a battery block, the top of the battery housing is provided with an upper cover, the top of the battery block is provided with an insulating plate, one side of the inner wall of the battery housing is provided with a two-phase coolant tank, one side of the inner wall of the battery housing close to the two-phase coolant tank is provided with a cooling auxiliary water tank, there are a plurality of battery blocks, hollow cooling plates are provided between the battery blocks, a liquid inlet conduit and a liquid outlet conduit are provided on the top of the insulating plate, and the liquid inlet conduit is connected to the inlet of the hollow cooling plate through a hose. The liquid end is connected, the liquid outlet conduit is connected to the liquid outlet end of the hollow cooling plate through a hose, a circulating liquid inlet pipe is connected above the liquid inlet conduit, a circulating liquid outlet pipe is connected above the liquid outlet conduit, one end of the circulating liquid inlet pipe is connected to the two-phase coolant tank, a lower pipe is provided on one side of the inner wall of the bottom of the cooling auxiliary water tank, a condenser is provided on one side of the lower pipe, an upper pipe is provided on the inner wall of the upper half of the cooling auxiliary water tank, the upper pipe is connected to the condenser, one end of the upper pipe is connected to an upper connecting pipe, one end of the upper connecting pipe is connected to the circulating liquid outlet pipe, and one end of the lower pipe is connected to the upper half of the two-phase coolant tank.

[0006] As a further explanation of the present invention, a connecting pipe is provided at one end of the lower pipe, one end of the connecting pipe is connected to the interior of the upper half of the two-phase coolant tank, and one end of the connecting pipe is connected to a circulating pump.

[0007] As a further explanation 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, and the external electrodes are electrically connected to the battery block.

[0008] As a further illustration of the present invention, the inner wall of the battery housing is located outside the battery block and is provided with a transverse support plate and a longitudinal support plate, and the transverse support plate and the longitudinal support plate limit and fix the battery block.

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

[0010] As a further explanation of the present invention, the cooling auxiliary water tank is filled with coolant, and the coolant covers the condenser.

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

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

[0013] As a further explanation of the present invention, one side of the cooling auxiliary water tank is in contact with the battery casing, and a heat sink is provided on the side of the cooling auxiliary water tank in contact with the battery casing.

[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 present invention has the following beneficial effects: The present invention realizes that when a high power density and energy density battery pack is used, the two-phase coolant in the two-phase coolant tank is sent to the liquid outlet pipe through the liquid outlet pump, and then the two-phase coolant is sent to the circulating liquid inlet pipe through the liquid outlet pipe, and finally enters the hollow cooling plate through the hose between the circulating liquid inlet pipe and the hollow cooling plate. After entering the hollow cooling plate, the two-phase coolant exchanges heat with the heat generated by the battery, and the heat of the battery converts the two-phase coolant from liquid to The process absorbs heat, and then the gaseous coolant enters the upper pipe through the liquid outlet conduit, the circulating liquid outlet pipe, and the upper connecting pipe, and then the gaseous coolant enters the condenser. The spirally arranged condenser allows 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 liquid. This process releases heat, and finally the cooling auxiliary water tank and the battery shell are used for centralized heat dissipation. The condensed coolant re-enters the two-phase coolant tank through the lower pipe, the circulating pump and the connecting pipe for re-circulation; The present invention absorbs a large amount of heat during the phase change process of the two-phase coolant and then dissipates the heat in a centralized manner, which can significantly improve the thermal management capability of the battery, thereby ensuring that the battery can operate safely and effectively under various conditions. It can not only improve the battery's charging and discharging efficiency, consistency and safety, but also extend the battery's service life, thereby indirectly improving its energy density performance throughout its entire life cycle. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A three-dimensional diagram of a high power density and energy density battery pack of the present invention; Figure 2 A three-dimensional diagram of a high power density and energy density battery pack of the present invention from another perspective; Figure 3 A three-dimensional diagram of the internal structure of a high power density and energy density battery pack of the present invention; Figure 4 A three-dimensional diagram of the internal structure of a high power density and energy density battery pack of the present invention from another perspective; Figure 5 A front view of the internal structure of a high power density and energy density battery pack of the present invention; Figure 6It is a schematic diagram of a two-phase coolant tank connection structure of a high power density and energy density battery pack of the present invention; Figure 7 A schematic diagram of a two-phase coolant tank connection structure of a high power density and energy density battery pack of the present invention from another perspective; Figure 8 A front view of a two-phase coolant tank connection structure of a high power density and energy density battery pack of the present invention; Fig. 9 A schematic diagram of a two-phase coolant tank connection structure of a high power density and energy density battery pack of the present invention from another perspective; Fig.10 It is a schematic diagram of a partial cross-sectional structure of a high power density and energy density battery pack of the present invention.

[0017] In the figure: 1. battery casing; 2. upper cover; 3. handle; 4. external electrode; 5. battery block; 6. horizontal support plate; 7. longitudinal support plate; 8. two-phase coolant tank; 9. circulation pump; 10. connecting pipe; 11. cooling auxiliary water tank; 12. upper pipe; 13. condenser; 14. upper connecting pipe; 15. lower pipe; 16. liquid outlet pump; 17. liquid outlet pipe; 18. circulating liquid inlet pipe; 19. insulating plate; 20. liquid inlet conduit; 21. liquid outlet conduit; 22. circulating liquid outlet pipe; 23. hollow cooling plate. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0019] See also Figure 1-Figure 10 The present invention provides a technical solution: a high power density and energy density battery pack, comprising: a battery housing 1 and a battery block 5, the battery housing 1 is provided with a battery block 5 on the inner wall at the bottom, the battery housing 1 is provided with an upper cover 2 on the top, 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, a cooling auxiliary water 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 a plurality of battery blocks 5, and hollow cooling plates 23 are 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, and 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 connected above the liquid inlet conduit 20, and a circulating liquid outlet pipe 22 is connected above the liquid outlet conduit 21. One end of the circulating liquid inlet pipe 18 is connected to the two-phase coolant tank 8. A lower pipe 15 is provided on one side of the inner wall at the bottom of the cooling auxiliary water tank 11, and a condenser 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 water tank 11, and the upper pipe 12 is connected to the condenser 13. One end of the upper pipe 12 is connected to an upper connecting pipe 14, and one end of the upper connecting pipe 14 is connected to the circulating liquid outlet pipe 22, and one end of the lower pipe 15 is connected to the upper half of the two-phase coolant tank 8. The two-phase coolant in the two-phase coolant tank 8 is sent to the outlet pipe 17 through the outlet pump 16, and then sent to the circulating inlet pipe 18 through the 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 entering the hollow cooling plate 23, the two-phase coolant exchanges heat with the heat generated by the battery. The heat of the battery converts the two-phase coolant from liquid to gas. This process absorbs heat, and then the gaseous coolant passes through the outlet pipe 21 and the circulating pipe 23. The liquid outlet pipe 22 and the upper connecting pipe 14 enter the upper pipe 12, and then the gaseous coolant enters the condenser 13. The spirally arranged condenser 13 allows 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 liquid. This process releases heat, and finally the cooling auxiliary water tank 11 and the battery housing 1 are centrally dissipated. 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 recirculation. The entire system forms a closed-loop cycle to ensure 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 auxiliary water tank in the condenser, heat can be effectively transferred from the battery to the environment. The various components in the system are carefully arranged to minimize space occupancy and maximize heat exchange efficiency.

[0020] A connecting pipe 10 is provided at one end of the lower pipe 15, one end of the connecting pipe 10 is connected to the interior of the upper half of the two-phase coolant tank 8, and one end of the connecting pipe 10 is connected to 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.

[0021] Handles 3 are provided on both sides of the outer wall of the top of the upper cover 2, and external electrodes 4 are provided on both sides of the top of the upper cover 2, 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 battery pack connected in series are electrically connected to the two external electrodes 4 respectively. The upper cover 2 is the top component of the battery pack, which is used to close the battery pack and protect the internal components from the influence of the external environment. It not only provides physical protection, but also plays a sealing role to prevent moisture, dust, etc. from entering the battery. The design of the handle 3 allows the user to easily lift the battery pack, especially when the battery needs to be moved from one place to another; the external electrodes 4 are a necessary component for power transmission between the battery pack and external devices, and the battery's electrical energy can be output to the device that needs power through these electrodes.

[0022] The inner wall of the battery housing 1 is provided with a transverse support plate 6 and a longitudinal support plate 7 on the outside of the battery block 5, and the transverse support plate 6 and the longitudinal support plate 7 limit and fix the battery block 5. The transverse support plate 6 and the longitudinal support plate 7 act together on the battery block 5 to ensure that the position of the battery block 5 inside the battery pack is stable, and it can remain stable even when the vehicle encounters bumps or turns during driving. By limiting the displacement of the battery block 5, the friction and collision between the battery blocks 5 and between the battery block 5 and the battery pack housing can be reduced, thereby reducing the risk of short circuit and thermal runaway.

[0023] A liquid outlet pump 16 is provided on one side of the bottom outer wall of the two-phase coolant tank 8, and a liquid outlet pipe 17 is connected to one end of the liquid outlet of the liquid outlet pump 16, and one end of the liquid outlet pipe 17 is connected to a circulating liquid inlet pipe 18. The two-phase coolant in the two-phase coolant tank 8 is sent to the liquid outlet pipe 17 through the liquid outlet pump 16, and then sent to the circulating liquid inlet pipe 18 through the liquid outlet pipe 17, and finally enters the hollow cooling plate 23 through the hose between the circulating liquid inlet pipe 18 and the hollow cooling plate 23.

[0024] The cooling auxiliary water tank 11 is filled with coolant, and the coolant covers the condenser 13. The two-phase coolant tank 8 is filled with two-phase coolant. The spirally arranged condenser 13 allows 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 liquid. This process releases heat, and finally the heat is concentratedly dissipated through the cooling auxiliary water tank 11 and the battery housing 1. The spiral condenser design can increase the contact area between the coolant and the coolant. The condenser is used in the condensation process of the gaseous coolant, so that it changes from gas back to liquid. The spiral design can maximize the heat exchange area between the gaseous coolant and the coolant, thereby improving the condensation efficiency.

[0025] One side of the cooling auxiliary water tank 11 is in contact with the battery housing 1, and a heat sink is provided on the side of the cooling auxiliary water tank 11 in contact with the battery housing 1. By providing a heat sink 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 sink 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.

[0026] 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 gap between the contact surfaces, reduce thermal resistance, ensure good contact between the two, and improve heat transfer efficiency.

[0027] When a high power density and energy density battery pack is used, the two-phase coolant in the two-phase coolant tank 8 is sent to the liquid outlet pipe 17 through the liquid outlet pump 16, and then sent to the circulating liquid inlet pipe 18 through the liquid outlet pipe 17, and finally enters the hollow cooling plate 23 through the hose between the circulating liquid inlet pipe 18 and the hollow cooling plate 23. After entering the hollow cooling plate 23, the two-phase coolant exchanges heat with the heat generated by the battery. The heat of the battery converts the two-phase coolant from liquid to gas. This process absorbs heat, and then the gaseous coolant passes through The liquid outlet conduit 21, the circulating liquid outlet pipe 22, and the upper connecting pipe 14 enter the upper pipe 12, and then the gaseous coolant enters the condenser pipe 13. The spirally arranged condenser pipe 13 allows 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 liquid. This process releases heat, and finally the cooling auxiliary water tank 11 and the battery housing 1 are used for centralized heat dissipation. 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 present invention absorbs a large amount of heat during the phase change process of the two-phase coolant and then dissipates the heat in a centralized manner, which can significantly improve the thermal management capability of the battery, thereby ensuring that the battery can operate safely and effectively under various conditions. It can not only improve the battery's charging and discharging efficiency, consistency and safety, but also extend the battery's service life, thereby indirectly improving its energy density performance throughout its entire life cycle.

[0028] Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without making any creative work shall fall within the scope of protection of the present invention.

Claims

1. A high power density and energy density battery pack, comprising: A battery housing (1) and a battery block (5), characterized in that: a battery block (5) is provided on the inner wall at 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 water 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 a plurality of battery blocks (5), and hollow cooling plates (23) are 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, and 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 connected above the liquid inlet conduit (20), and a circulating liquid outlet pipe (22) is connected above the liquid outlet conduit (21). The circulating liquid inlet pipe (18) is connected to the liquid outlet pipe (22). ) is connected to the two-phase coolant tank (8); a lower pipe (15) is provided on one side of the inner wall of the bottom of the cooling auxiliary water tank (11); a condenser (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 water tank (11); the upper pipe (12) is connected to the condenser (13); one end of the upper pipe (12) is connected to an upper connecting pipe (14); one end of the upper connecting pipe (14) is connected to the circulating liquid outlet pipe (22); one end of the lower pipe (15) is connected to the upper half of the two-phase coolant tank (8).

2. A high power density and energy density battery pack according to claim 1, characterized in that: A connecting pipe (10) is provided at one end of the lower pipe (15), one end of the connecting pipe (10) is connected to the interior of the upper half of the two-phase coolant tank (8), and one end of the connecting pipe (10) is connected to a circulating pump (9).

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

4. A high power density and energy density battery pack according to claim 1, characterized in that: The inner wall of the battery housing (1) is provided with a transverse support plate (6) and a longitudinal support plate (7) on the outside of the battery block (5); the transverse support plate (6) and the longitudinal support plate (7) are used to position and fix the battery block (5).

5. A high power density and energy density battery pack according to claim 1, characterized in that: A liquid outlet pump (16) is provided on one side of the bottom outer wall of the two-phase coolant tank (8); one end of the liquid outlet of the liquid outlet pump (16) is connected to a liquid outlet pipe (17); one end of the liquid outlet pipe (17) is connected to a circulating liquid inlet pipe (18).

6. A high power density and energy density battery pack according to claim 1, characterized in that: The cooling auxiliary water tank (11) is filled with cooling liquid, and the cooling liquid covers the condenser tube (13).

7. A high power density and energy density battery pack according to claim 1, characterized in that: A plurality of the battery blocks (5) form a battery pack, and the positive and negative electrodes of the battery pack connected in series are electrically connected to the two external electrodes (4) respectively.

8. A high power density and energy density battery pack according to claim 1, characterized in that: The two-phase coolant tank (8) is filled with two-phase coolant.

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

10. A high power density and energy density battery pack according to claim 1, characterized in that: Thermally 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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