Battery pole cooling device, secondary battery and electric vehicle

Abstract

The utility model provides a battery pole column cooling device, a secondary battery and an electric car, and belongs to the technical field of secondary batteries, the battery pole column cooling device comprises an air duct, the air duct is positioned on one side of a battery cell provided with a pole column, and the air duct is opposite to the pole column; a heat pipe is arranged between the air duct and the pole, the evaporation end of the heat pipe is tightly attached to the pole, and the condensation end of the heat pipe is tightly attached to the air duct; by arranging the air duct and connecting the air duct with the pole through the heat pipe, the evaporation end of the heat pipe is connected with the pole and the condensation end of the heat pipe is connected with the air duct by utilizing the high heat transfer characteristic of the heat pipe, so that rapid heat dissipation is realized, the heat dissipation efficiency is improved, and the situation that a battery cell or a battery is damaged due to heat concentration caused by overheat is prevented.

Description

Technical Field

[0001] The utility model belongs to the technical field of secondary batteries, and in particular relates to a battery pole cooling device, a secondary battery and an electric vehicle. Background Art

[0002] During the use of lithium-ion batteries in new energy vehicles, due to differences in external environment, structural design, and operating conditions, large temperature differences often occur between battery cells. This can easily damage the battery and hinder its full potential, resulting in a good driving experience. This large temperature difference between cells is often reflected at the connection point, namely the battery post. This is because the voltage drop of the connecting cable at the battery post and assembly procedures may vary, leading to large temperature differences. A method that can partially avoid this phenomenon would be of great benefit to both the battery and the vehicle.

[0003] The existing technology directly uses a copper busbar with high conduction power to dissipate heat. Because the copper busbar is in a connected position, the contact resistance is relatively high, and there is heat concentration. This can dissipate heat when the heat is low, but when the battery heats up more, the heat dissipation is not timely, causing the temperature to rise and even fire.

[0004] Therefore, a battery pole cooling device is needed to improve heat dissipation efficiency. Utility Model Content

[0005] In view of the above problems, the present invention proposes a battery pole cooling device, including an air duct,

[0006] The air duct is located on a side of the battery cell where a pole is provided, and the air duct is directly opposite the pole; a heat pipe is provided between the air duct and the pole, the evaporation end of the heat pipe is in close contact with the pole, and the condensation end is in close contact with the air duct.

[0007] A secondary battery comprises a box and a battery cell module, wherein a plurality of battery cell modules are installed in the box, and the battery cell module is composed of a plurality of battery cells with poles arranged on the side; air ducts and heat pipes of the battery pole cooling device described in the claim are installed between adjacent battery cell modules and / or on one side of the battery cell modules.

[0008] Furthermore, end plates are respectively installed at both ends of the battery cell module.

[0009] Furthermore, foam is provided between adjacent battery cells and / or between adjacent battery cells and end plates.

[0010] Furthermore, pole pieces are installed on the outer sides of poles of two adjacent groups of battery cells, the evaporation end of the heat pipe is attached to the outer surface of the pole piece, and the condensation end of the heat pipe is close to the air duct.

[0011] Furthermore, the air duct is embedded in the box body, and vents are symmetrically arranged on both sides of the box body, and both ends of the air duct are respectively communicated with the symmetrically arranged vents.

[0012] Furthermore, the air duct is a square pipe.

[0013] Furthermore, reinforcing ribs are provided inside the air duct.

[0014] An electric vehicle comprises a frame, on which the battery according to any one of claims 1 is arranged.

[0015] Furthermore, the connecting line of the symmetrically arranged ventilation openings is parallel to the traveling direction of the tram.

[0016] Beneficial effects:

[0017] 1. The present invention provides an air duct, connects the air duct to the pole via a heat pipe, and utilizes the high heat transfer characteristics of the heat pipe to connect the evaporation end of the heat pipe to the pole, and the condensation end of the heat pipe to the air duct, thereby achieving rapid heat dissipation and improving heat dissipation efficiency, thereby preventing heat concentration caused by excessive heat, which may damage the battery cell or battery.

[0018] 2. The utility model is provided with a pole piece, which is used to connect adjacent poles. At the same time, the other side is connected to the adjacent poles through the pole piece. The pole pieces on both sides are staggered, so that all the battery cells in each group of battery cell modules are connected in series, thereby realizing the series connection of the entire battery cell and increasing the voltage in the entire battery cell module.

[0019] 3. In the present invention, foam is provided between adjacent battery cells and / or between adjacent battery cells and end plates. The foam reduces the stress between adjacent battery cells and at the same time acts as an insulator, and acts as a heat insulator when the battery cells generate less heat.

[0020] 4. The utility model sets the ventilation opening to be the same as the direction of travel of the tram. When the power device accelerates, the pole temperature rises, the pole temperature rises, and the heat pipe is used to transfer the heat to the air duct. The heat increase is related to the high discharge characteristics of the power battery. At this time, the speed of the power device is getting faster and faster, the wind in the air duct is stronger, and the heat dissipation is also enhanced.

[0021] Other features and advantages of the present invention will be described in the following description, and in part will become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention can be achieved and obtained by the structures indicated in the description, claims and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0023] Figure 1 A schematic diagram of a secondary battery in an embodiment of the present utility model is shown.

[0024] Figure 2 The diagram shows a schematic top view of a partial structure of a secondary battery in an embodiment of the present utility model.

[0025] Figure 3 Shown Figure 2 A magnified schematic diagram of the local structure at point A.

[0026] Figure 4 The figure shows a schematic structural diagram of the battery cell module in an embodiment of the present utility model.

[0027] Figure 5 A partial explosion diagram of a battery cell module in an embodiment of the present utility model is shown.

[0028] In the figure, 1. Box; 2. Battery cell; 3. Pole; 4. Air duct; 5. Heat pipe; 6. Reinforcement rib; 7. End plate; 8. Foam; 9. Pole; 11. Vent. DETAILED DESCRIPTION

[0029] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0030] refer to Figure 3 A battery pole cooling device includes an air duct 4 located on the side of a battery cell 2 where a pole 9 is located, and directly facing the pole 9. A heat pipe 5 is disposed between the air duct 4 and the pole 9, with the evaporation end of the heat pipe 5 in close contact with the pole 9 and the condensation end of the heat pipe 5 in close contact with the air duct 4. The heat pipe 5 utilizes its high heat transfer properties to transfer heat generated by the pole 9 to the air duct 4, where it dissipates heat, thereby improving cooling efficiency.

[0031] Specifically, the battery pole cooling device uses the heat pipe 5 to transfer the heat generated by the battery pole 9 to the air duct 4, and the heat is quickly dissipated through the air duct 4, thereby improving the heat dissipation efficiency.

[0032] like Figure 1 As shown, Figure 1 Schematic diagram of a secondary battery in an embodiment of the present invention is shown. Figure 1 A secondary battery comprises a box body 1 and a battery cell module. Several groups of battery cell modules are installed in the box body 1. The battery cell module is composed of several battery cells 2 with poles 9 arranged on the side; and the same poles 9 of the battery cells 2 are located on the same side to connect the battery cells 2 in parallel, or the poles 9 on the same side of adjacent battery cells 2 are different (that is, one positive and one negative are arranged in sequence), and the battery cells 2 are connected in series; the above-mentioned battery pole cooling device is installed between adjacent battery cell modules, that is, an air duct 4 is installed between adjacent battery cell modules, and several heat pipes 5 are arranged on the side of the air duct 4 close to the battery cell module, and the evaporation end of the heat pipe 5 is in close contact with the pole 9, and the condensation end is in close contact with the air duct 4 to complete heat dissipation.

[0033] Another embodiment of the present invention is a secondary battery, comprising a housing 1 and a battery cell module, wherein a plurality of battery cell modules are installed in the housing 1, and the battery cell module is composed of a plurality of battery cells 2 with poles 9 arranged on the side thereof; and the same poles 9 of the battery cells 2 are located on the same side to connect the battery cells 2 in parallel, or the poles 9 on the same side of adjacent battery cells 2 are different (i.e., one positive and one negative are arranged in sequence), and the battery cells 2 are connected in series; the above-mentioned battery pole cooling device is installed on one side of the battery cell module, that is, an air duct 4 is installed on the side of the battery cell module where the pole 9 is provided, and a plurality of heat pipes 5 are arranged on the side of the air duct 4 close to the battery cell module, and the evaporation ends of the heat pipes 5 are respectively in close contact with the poles 9, and the condensation ends are in close contact with the air duct 4 to complete heat dissipation.

[0034] The utility model provides that the battery cells 2 in the battery cell module are connected in series, such as Figure 4 or Figure 5 As shown, the poles 9 on the same side of adjacent battery cells 2 are different (i.e., one positive and one negative are arranged in sequence), and the adjacent poles 9 are connected by pole pieces 3, which are used to connect adjacent poles 9. At the same time, the adjacent poles 9 on the other side are connected by pole pieces 3 (the pole pieces 3 on both sides are staggered), thereby connecting all the battery cells 2 in each group of battery cell modules in series, thereby realizing the series connection of the entire battery cell 2 and increasing the voltage in the entire battery cell module.

[0035] Specifically, pole pieces 3 are installed on the outside of poles 9 of two adjacent groups of battery cells 2. The evaporation end of a heat pipe 5 is attached to the middle of the outer surface of the pole piece 3, and the condensation end of the heat pipe 5 is closely attached to the air duct 4. This reduces the number of heat pipes 5 installed and saves costs, while also connecting two adjacent groups of battery cells 2 in series.

[0036] In the above embodiment, another optional implementation is that the battery cells 2 in the battery cell module are connected in parallel, and the poles 9 on the same side of adjacent battery cells 2 have the same polarity (i.e. one side is negative and the other side is positive), and the poles 9 on the same side are connected through the pole piece 3, thereby connecting all the battery cells 2 in each group of battery cell modules in parallel, thereby realizing the parallel connection of the battery cells 2 as a whole, improving the fault tolerance of the battery cells 2 in the overall battery cell module, and preventing the battery cells 2 from being separated from the pole piece 3 due to vibration or bumps, thereby causing the entire battery cell module to stop working.

[0037] Specifically, a pole piece 3 is mounted on the outside of the pole 9 of each group of battery cells 2. The evaporation end of the heat pipe 5 is attached to the middle of the outer surface of the pole piece 3, and the condensation end of the heat pipe 5 is close to the air duct 4. This reduces the number of heat pipes 5 installed and saves costs, while also connecting two adjacent groups of battery cells 2 in series.

[0038] In the above embodiment, another optional implementation is that the battery cells 2 in the battery cell module are connected in parallel, and the poles 9 on the same side of adjacent battery cells 2 have the same polarity (i.e. one side is negative and the other side is positive), and the poles 9 on the same side are connected through the pole piece 3, thereby connecting all the battery cells 2 in each group of battery cell modules in parallel, thereby realizing the parallel connection of the battery cells 2 as a whole, improving the fault tolerance of the battery cells 2 in the overall battery cell module, and preventing the battery cells 2 from being separated from the pole piece 3 due to vibration or bumps, thereby causing the entire battery cell module to stop working.

[0039] Specifically, a pole piece 3 is installed on the outside of the pole 9 of each group of battery cells 2, and a plurality of heat pipes 5 are equidistantly attached to the outer surface of the pole piece 3 (for example, they are arranged according to the number of poles 9 on the battery cell 2, each pole 9 corresponds to a heat pipe 5, and the heat pipe 5 is facing the pole 9), and the evaporation end of the heat pipe 5 and the condensation end of the heat pipe 5 are close to the air duct 4.

[0040] In another specific solution, a pole piece 3 is installed outside the pole 9 of each group of battery cells 2. Multiple heat pipes 5 are equidistantly attached to the outer surface of the pole piece 3 (for example, they are arranged according to the number of poles 9 on the battery cells 2, with one heat pipe 5 corresponding to every two poles 9, and the heat pipe 5 faces the pole piece 3 between the two poles 9). The evaporation end and the condensation end of the heat pipe 5 are closely attached to the air duct 4. This solution reduces the number of heat pipes 5 installed, saves costs, and simultaneously connects two adjacent groups of battery cells 2 in series.

[0041] In the above embodiment, another optional implementation is that end plates 7 are respectively installed at both ends of the battery module, and the end plates 7 are installed in the box body 1 (refer to Figure 4 and Figure 5 The end plates 7 are mounted on the large surfaces of the battery cells 2 at both ends of the battery cell module. The end plates 7 play a protective role and improve the strength of the battery cell module.

[0042] In the implementation of the present invention, foam 8 is provided between adjacent battery cells 2 and / or between adjacent battery cells 2 and end plates 7. The foam 8 reduces the force between adjacent battery cells 2 and at the same time plays an insulating role. When the battery cells 2 generate less heat, it plays a heat-insulating role.

[0043] In the above embodiment, another optional implementation is that pole pieces 3 are installed on the outer sides of the poles 9 of two adjacent groups of battery cells 2, the evaporation end of the heat pipe 5 is attached to the middle position of the outer surface of the pole piece 3, and the condensation end of the heat pipe 5 is closely attached to the air duct 4. This reduces the number of heat pipes 5 installed and saves costs, while also connecting the two adjacent groups of battery cells 2 in series.

[0044] The air duct 4 is embedded in the housing 1, and vents 11 are symmetrically arranged on both sides of the housing 1. The symmetrical vents 11 are connected to both ends of the air duct 4, allowing air to enter the air duct 4 through the vents 11 for heat dissipation. The air duct 4 is a square or circular pipe, and can be configured into pipes of different shapes as needed. Specifically, a reinforcing rib 6 is provided inside the air duct 4, which divides the air duct 4 into two air ducts to increase the shear stress of the air duct 4. A tram includes a frame, on which the aforementioned secondary battery is arranged. The line connecting the symmetrical vents 11 is parallel to the direction of travel of the tram.

[0045] Working principle: Under normal working conditions, when the tram is running, the power battery discharges at a high rate, the power becomes stronger and stronger, the speed of the tram becomes faster and faster, the temperature of the battery cell 2 rises faster, and then the temperature of the pole 9 rises faster, and then the temperature of the pole piece 3 connected to the pole 9 becomes higher and higher, and a phase change occurs in the heat pipe 5 that is close to the pole piece 3, and the heat is transferred to the air duct 4, and the air duct 4 releases heat. The connecting line of the symmetrically arranged vents 11 is parallel to the running direction of the tram, that is, the vents 11 move in the direction of the wind; then the wind speed in the air duct 4 becomes larger and larger, ensuring the heat dissipation of the pole piece 3, and then ensuring the normal temperature of the pole piece 3, thereby ensuring the normal temperature of the pole piece 3.

[0046] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A battery pole cooling device, characterized in that: including air duct (4), The air duct (4) is located on a side of the battery core (2) where the pole (9) is provided, and the air duct (4) is directly opposite the pole (9); a heat pipe (5) is provided between the air duct (4) and the pole (9), the evaporation end of the heat pipe (5) is in close contact with the pole (9), and the condensation end of the heat pipe (5) is in close contact with the air duct (4).

2. A secondary battery, characterized in that: The invention comprises a box body (1) and a battery cell module, wherein a plurality of battery cell modules are installed in the box body (1), and the battery cell module is composed of a plurality of battery cells (2) with poles (9) arranged on the side thereof; and air ducts (4) and heat pipes (5) of the battery pole cooling device according to claim 1 are installed between adjacent battery cell modules and / or on one side of the battery cell modules.

3. A secondary battery according to claim 2, characterized in that: End plates (7) are respectively installed at both ends of the battery core module.

4. A secondary battery according to claim 3, characterized in that: Foam (8) is provided between adjacent battery cells (2) and / or between adjacent battery cells (2) and end plates (7).

5. A secondary battery according to claim 2, characterized in that: Pole pieces (3) are installed on the outsides of poles (9) of two groups of battery cells (2) that are adjacent to each other in sequence. The evaporation end of a heat pipe (5) is attached to the outer surface of the pole piece (3), and the condensation end of the heat pipe (5) is closely attached to the air duct (4).

6. A secondary battery according to claim 2, characterized in that: The air duct (4) is embedded in the box body (1), and ventilation openings (11) are symmetrically arranged on both sides of the box body (1). Both ends of the air duct (4) are respectively connected to the symmetrically arranged ventilation openings (11).

7. A secondary battery according to claim 6, characterized in that: The air duct (4) is a square pipe.

8. A secondary battery according to claim 7, characterized in that: Reinforcement ribs (6) are provided inside the air duct (4).

9. A tram, characterized in that: The vehicle comprises a frame, on which the battery according to any one of claims 2 to 8 is arranged.

10. The electric vehicle according to claim 9, characterized in that: The connecting line of the symmetrically arranged ventilation openings (11) is parallel to the running direction of the tram.

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