External liquid cooling system for power battery

Abstract

The invention provides a power battery external liquid cooling system, which comprises an outer box body, liquid inlet flow channels are arranged on two side surfaces of the outer box body, the other ends of the liquid inlet flow channels are provided with condensers on the front end surface of the outer box body, a sealing cover is arranged above the outer box body, an observation cover is arranged on the upper surface of the sealing cover, and a liquid outlet is formed in the observation cover. An inner circulation liquid cooling pipe is arranged in the outer box body, and a power battery insertion cylinder is arranged on the inner surface of the inner circulation liquid cooling pipe, so that the problem that the damage position cannot be quickly determined when a single power battery is damaged and leaks liquid in the process of cooling the power battery by the external liquid cooling system is solved.

Description

Technical Field

[0001] The present invention mainly relates to the field of protective film manufacturing, and in particular to an external liquid cooling system for a power battery. Background Art

[0002] The continuous development and progress of new energy vehicles has promoted the increase in the demand for power battery temperature control, and the proportion of power battery systems equipped with liquid cooling systems has increased year by year. As the current mainstream active thermal management system, the liquid cooling system has the characteristics of high heat exchange efficiency and good temperature difference control. However, due to the large number of components in the liquid cooling system assembly, if the quality of the components themselves is not well controlled, there is a certain risk of coolant leakage, causing insulation problems in the power battery system, and even fire.

[0003] In the utility model patent application with application number CN201821451745.X and application publication date 2019.07.12, entitled "A Power Battery External Liquid Cooling System", the invention comprises a box body and an upper cover detachably connected to the upper end of the box body, at least one crossbeam is arranged in the box body, and a tray is detachably connected to the lower end of the box body, characterized in that a liquid cooling plate is arranged between the box body and the tray, a thermal conductive pad is arranged between the liquid cooling plate and the box body, a coolant flow channel is arranged in the liquid cooling plate, a coolant inlet and a coolant outlet are arranged at both ends of the coolant flow channel, and a plurality of spoilers are arranged on the coolant flow channel. The device effectively separates the liquid cooling plate from the power battery through the thermal conductive pad and the bottom plate of the box body, and at the same time, the thermal conductive pad and the bottom plate of the box body can also ensure the heat transfer capability between the power battery and the liquid cooling plate, thereby effectively avoiding the influence of coolant leakage in the liquid cooling plate on the power battery under the premise of ensuring the heat dissipation capability of the power battery.

[0004] The inventor discovered the following defects during the operation of the specific embodiment: When the external liquid cooling system described above is cooling the power battery, if a single power battery is damaged and leaks, the damage location cannot be quickly determined. Summary of the invention

[0005] 1. Technical problem to be solved by the invention: The present invention provides an external liquid cooling system for a power battery, which is used to solve the technical problems existing in the above-mentioned background technology.

[0006] 2. Technical solution: To achieve the above-mentioned purpose, the technical solution provided by the present invention is: an external liquid cooling system for a power battery, comprising an outer box body, liquid inlet channels are arranged on the surfaces of both sides of the outer box body, a condenser is arranged on the other end of the liquid inlet channel at the front end surface of the outer box body, a sealing cover is installed above the outer box body, an observation cover is arranged on the surface above the sealing cover, an internal circulation liquid cooling pipe is arranged inside the outer box body, and a power battery insert is arranged on the inner surface of the internal circulation liquid cooling pipe.

[0007] Furthermore, the outer box body is provided with a liquid outlet channel on the other side surface of the liquid inlet channel, and the internal circulation liquid cooling pipe, the liquid inlet channel, the power battery insert, the liquid outlet channel, and the condenser constitute a refrigerant circulation structure. The observation cover is installed on the surface of the sealing cover through the screws arranged in a ring on its surface, and the sealing cover is installed on the top of the outer box body through the screws around it.

[0008] Furthermore, the internal circulation liquid cooling tube includes a liquid inlet arrangement tube, a series tube one is arranged between the liquid inlet arrangement tubes, an inner isolation cover is arranged on one side of the series tubes, an annular hollow disk is arranged on the lower end surface of the liquid inlet arrangement tube, a bottom plug rod is arranged on the upper surface of the annular hollow disk, an upper through disk is arranged on one side of the inner isolation cover, a liquid outlet arrangement tube is arranged on the other side surface of the upper through disk, a series tube two is arranged between the liquid outlet arrangement tubes, and a transparent observation plate is arranged on the surface of the upper through disk.

[0009] Furthermore, the liquid inlet arrangement pipes are provided with two groups, which are respectively arranged on both sides of the power battery insert, and the liquid inlet arrangement pipes are provided with a plurality of branch pipes, and each branch pipe is interconnected by a series pipe, and the refrigerant is transported to the branch pipes at the bottom of the inner wall of the outer box body, and the branch pipes at the bottom of the inner wall of the outer box body are connected to each other through an annular hollow disk, and a plurality of bottom plug rods are provided.

[0010] Furthermore, the upper through-disk is connected to each other at the uppermost liquid inlet arrangement pipes, and the refrigerant enters the upper through-disk through the power battery insert and the second series pipe, and is finally transported to the condenser through the liquid outlet channel to form an internal circulation. The top of the power battery insert can be observed through the transparent observation plate on the surface of the upper through-disk, and the lower end of the upper through-disk is provided with a bottom plug rod that is the same as the upper surface of the annular hollow disk.

[0011] Furthermore, the power battery insert comprises an outer annular shell, a plurality of single battery tubes are arranged on the inner wall of the outer annular shell, hexagonal partitions are arranged between the single battery tubes, and a flow rod insertion hole is arranged at the connecting part of the hexagonal partition.

[0012] Furthermore, a plurality of single cell tubes are provided, and are mounted on the inner wall of the outer annular shell through hexagonal partitions, the power battery is mounted inside the single cell tube, and the distribution position of the flow rod plug hole is consistent with the bottom plug rod position.

[0013] Furthermore, the refrigerant flows between the single cell tubes through the flow rod insertion hole, and is discharged from the interior of the outer annular shell through the flow rod insertion hole at the upper end and the upper through plate.

[0014] 3. Beneficial effects: The present invention has a reasonable design. When cooling the power battery, the refrigerant enters the liquid inlet arrangement pipe through the liquid inlet flow channel, and then flows to the branch pipe at the bottom of the inner wall of the outer box body through the series pipe 1. The refrigerant of several branch pipes enters the branch pipe at the bottom of the inner wall of the outer box body through the series pipe 1 and then converges inside the annular hollow disk. It enters the gap between the single cell tubes in the power battery plug tube through the bottom insert pipe above it, and cools the surface of the single cell tube. Finally, the refrigerant enters the upper through disk through the flow rod plug hole at the upper end of the single cell tube and the bottom insert pipe, and enters the condenser through the series pipe 2, the liquid outlet arrangement pipe and the liquid outlet flow channel to complete the circulation. In this process, on the one hand, the number of liquid inlet pipes and liquid outlet pipes is increased to increase the flow rate and improve the cooling effect. On the other hand, the power battery and the liquid cooling system are isolated to avoid the influence of battery liquid or refrigerant leakage on both. When the power battery is damaged, the observation cover is removed from the surface of the sealing cover, and the batteries arranged in the single cell tube on the surface of the power battery plug-in tube are observed through the transparent observation plate provided on the surface of the upper through-disk, so that the damaged battery can be quickly identified. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the present invention; Figure 2 It is a schematic diagram of the internal three-dimensional structure of the present invention; Figure 3 It is a schematic diagram of the internal circulation liquid cooling tube in the present invention; Figure 4 It is a schematic plan view of the internal circulation liquid cooling tube of the present invention; Figure 5 It is a three-dimensional schematic diagram of the upper through plate of the present invention; Figure 6 This is a schematic diagram of a power battery insert of the present invention; Figure 7 For the present invention Figure 6 Schematic diagram of A in the figure; Figure 8 Schematic diagram of a single-cell cartridge of the present invention.

[0016] Reference numerals: 1. Outer box; 2. Liquid inlet channel; 3. Condenser; 4. Sealing cover; 5. Observation cover; 6. Internal circulation liquid cooling tube; 601. Liquid inlet arrangement tube; 602. Series tube one; 603. Inner isolation cover; 604. Annular hollow disk; 605. Bottom insert; 606. Upper through disk; 607. Liquid outlet arrangement tube; 608. Series tube two; 609. Transparent observation plate; 7. Power battery insert tube; 701. Outer annular shell; 702. Single battery tube; 703. Hexagonal partition; 704. Flow rod plug hole. DETAILED DESCRIPTION

[0017] To facilitate understanding of the present invention, the present invention will be described more comprehensively below with reference to the relevant drawings. Several embodiments of the present invention are shown in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive.

[0018] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "page", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicating orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0019] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0020] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed", "provided with", etc. should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be internal communication between two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. Example

[0021] See attached Figure 1-6, comprising an outer box body 1, liquid inlet channels 2 are arranged on both sides of the outer box body, a condenser 3 is arranged on the other end of the liquid inlet channel 2 at the positive end surface of the outer box body 1, a sealing cover 4 is installed on the top of the outer box body 1, an observation cover 5 is arranged on the upper surface of the sealing cover 4, an inner circulation liquid cooling pipe 6 is arranged inside the outer box body 1, a power battery insert 7 is arranged on the inner surface of the inner circulation liquid cooling pipe 6, a liquid outlet channel is arranged on the other side surface of the liquid inlet channel 2 of the outer box body 1, a refrigerant circulation structure is formed between the inner circulation liquid cooling pipe 6, the liquid inlet channel 2, the power battery insert 7, the liquid outlet channel, and the condenser 3, the observation cover 5 is installed on the surface of the sealing cover 4 by means of screws arranged in an annular manner on its surface, and the sealing cover 4 is installed on the top of the outer box body 1 by means of screws around it, and the device observes the batteries arranged in the single battery tube 702 on the surface of the power battery insert 7 through the transparent observation plate 609 arranged on the surface of the upper through disk 606, so as to quickly identify the damaged batteries.

[0022] The inner circulation liquid cooling tube 6 includes a liquid inlet arrangement tube 601, a series tube 1 602 is arranged between the liquid inlet arrangement tubes 601, an inner isolation cover 603 is arranged on one side of the series tube 602, an annular hollow disk 604 is arranged on the lower end surface of the liquid inlet arrangement tube 601, a bottom insert 605 is arranged on the upper surface of the annular hollow disk 604, an upper through disk 606 is arranged on one side of the inner isolation cover 603, a liquid outlet arrangement tube 607 is arranged on the other side surface of the upper through disk 606, a series tube 2 608 is arranged between the liquid outlet arrangement tubes 607, and a transparent observation plate 609 is arranged on the surface of the upper through disk 606. The liquid inlet arrangement pipe 601 is provided with two groups, which are respectively arranged on both sides of the power battery insert 7, and the liquid inlet arrangement pipe 601 is provided with a plurality of branch pipes, and each branch pipe is interconnected through a series pipe 1 602, and the refrigerant is transported to the branch pipe at the bottom of the inner wall of the outer box body 1, and the branch pipes at the bottom of the inner wall of the outer box body 1 are interconnected through an annular hollow disk 604, and the bottom insert pipe 605 is provided with a plurality of roots, and the upper through disk 606 is respectively connected to the uppermost liquid inlet arrangement pipe 601, and the refrigerant enters the upper through disk 606 and the series pipe 2 608 through the power battery insert 7, and is finally transported to the condenser 3 through the liquid outlet channel to form an internal circulation, and the top of the power battery insert 7 can be observed through the transparent observation plate 609 on the surface of the upper through disk 606, and the lower end of the upper through disk 606 is provided with a bottom insert pipe 605 that is the same as the upper surface of the annular hollow disk 604.

[0023] In this embodiment, when cooling the power battery, the refrigerant enters the liquid inlet arrangement tube 601 through the liquid inlet flow channel 2, and then flows to the branch tube at the bottom of the inner wall of the outer box body 1 through the series tube 1 602. After entering the branch tube at the bottom of the inner wall of the outer box body 1 through the series tube 1 602, the refrigerant of several branch tubes converges inside the annular hollow disk 604, and enters the gap between the single cell tubes 702 in the power battery insert 7 through the bottom insert tube 605 above it, and cools the surface of the single cell tube 702. Finally, the refrigerant enters the upper through disk 606 through the flow rod plug hole 704 and the bottom insert tube 605 at the upper end of the single cell tube 702, and enters the condenser 3 through the series tube 2 608, the liquid outlet arrangement tube 607 and the liquid outlet flow channel to complete the circulation. In this process, on the one hand, by increasing the number of liquid inlet pipes and liquid outlet pipes, the flow rate is increased to improve the cooling effect. On the other hand, by isolating the power battery and the liquid cooling system, the influence of battery liquid or refrigerant leakage on both is avoided.

[0024] The power battery insert 7 includes an outer annular shell 701, and a plurality of single cell tubes 702 are arranged on the inner wall of the outer annular shell 701. Hexagonal partitions 703 are arranged between the single cell tubes 702. The connecting part of the hexagonal partition 703 is provided with a flow rod socket 704. There are a plurality of single cell tubes 702, and they are mounted on the inner wall of the outer annular shell 701 through the hexagonal partitions 703. The power battery is installed inside the single cell tube 702. The distribution position of the flow rod socket 704 is consistent with the position of the bottom insert 605. The refrigerant flows between the single cell tubes 702 through the flow rod socket 704, and is discharged from the outer annular shell 701 through the flow rod socket 704 at the upper end and the upper through disk 606.

[0025] In this embodiment, when the power battery is damaged, the observation cover 5 is removed from the surface of the sealing cover 4, and the batteries arranged in the single cell tube 702 on the surface of the power battery insert 7 are observed through the transparent observation plate 609 provided on the surface of the upper through disk 606, so that the damaged battery can be quickly identified.

[0026] The above-described embodiments only express a certain implementation mode of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the patent scope of the present invention. It should be pointed out that, for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be based on the attached claims.

Claims

1. A power battery external liquid cooling system, characterized in that: The invention comprises an outer box (1), liquid inlet channels (2) are arranged on both side surfaces of the outer box, a condenser (3) is arranged at the other end of the liquid inlet channel (2) on the front end surface of the outer box (1), a sealing cover (4) is installed above the outer box (1), an observation cover (5) is arranged on the upper surface of the sealing cover (4), an internal circulation liquid cooling pipe (6) is arranged inside the outer box (1), and a power battery insert (7) is arranged on the inner surface of the internal circulation liquid cooling pipe (6).

2. The external liquid cooling system for a power battery according to claim 1, characterized in that: The outer box body (1) is provided with a liquid outlet channel on the other side surface of the liquid inlet channel (2); the inner circulation liquid cooling pipe (6), the liquid inlet channel (2), the power battery insert (7), the liquid outlet channel, and the condenser (3) form a refrigerant circulation structure; the observation cover (5) is mounted on the surface of the sealing cover (4) via screws arranged in an annular manner on its surface; and the sealing cover (4) is mounted on the top of the outer box body (1) via screws arranged around it.

3. The external liquid cooling system for a power battery according to claim 2, characterized in that: The internal circulation liquid cooling tube (6) comprises a liquid inlet arrangement tube (601), a series tube one (602) is arranged between the liquid inlet arrangement tubes (601), an inner isolation cover (603) is arranged on one side of the series tube (602), an annular hollow disk (604) is arranged on the lower end surface of the liquid inlet arrangement tube (601), a bottom insert tube (605) is arranged on the upper surface of the annular hollow disk (604), an upper through disk (606) is arranged on one side of the inner isolation cover (603), a liquid outlet arrangement tube (607) is arranged on the other side surface of the upper through disk (606), a series tube two (608) is arranged between the liquid outlet arrangement tubes (607), and a transparent observation plate (609) is arranged on the surface of the upper through disk (606).

4. The external liquid cooling system for a power battery according to claim 3, characterized in that: The liquid inlet arrangement pipes (601) are provided with two groups, which are respectively provided on both sides of the power battery insert (7), and the liquid inlet arrangement pipes (601) are provided with a plurality of branch pipes, and each branch pipe is interconnected through a series pipe (602), and the refrigerant is transported to the branch pipes at the bottom of the inner wall of the outer box body (1), and the branch pipes at the bottom of the inner wall of the outer box body (1) are interconnected through an annular hollow disk (604), and the bottom insert pipes (605) are provided with a plurality of.

5. The external liquid cooling system for a power battery according to claim 4, characterized in that: The upper through disk (606) is respectively connected to each other at the uppermost liquid inlet arrangement pipe (601), and the refrigerant enters the upper through disk (606) and the second series pipe (608) through the power battery plug-in tube (7) and is finally transported to the condenser (3) through the liquid outlet flow channel to form an internal circulation. The top of the power battery plug-in tube (7) can be observed through a transparent observation plate (609) on the surface of the upper through disk (606). The lower end of the upper through disk (606) is provided with a bottom plug-in tube (605) which is the same as the upper surface of the annular hollow disk (604).

6. The external liquid cooling system for a power battery according to claim 1, characterized in that: The power battery insert (7) comprises an outer annular shell (701), a plurality of single battery cylinders (702) are arranged on the inner wall of the outer annular shell (701), hexagonal partitions (703) are arranged between the single battery cylinders (702), and a flow rod insertion hole (704) is arranged at the connecting part of the hexagonal partition (703).

7. The external liquid cooling system for a power battery according to claim 6, characterized in that: A plurality of single cell cylinders (702) are provided and are mounted on the inner wall of the outer annular shell (701) via hexagonal partitions (703); the power battery is mounted inside the single cell cylinder (702); and the distribution position of the flow rod insertion holes (704) is consistent with the position of the bottom insertion tube (605).

8. The external liquid cooling system for a power battery according to claim 6, characterized in that: The refrigerant flows between the single cell cylinders (702) through the flow rod insertion hole (704), and is discharged from the interior of the outer annular shell (701) through the flow rod insertion hole (704) at the upper end and the upper through plate (606).

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