Battery module

Abstract

The application discloses a battery module, comprising: an electric core; a fixing part with a plurality of installation parts, the electric core is arranged on the installation part, and a channel for gas up and down circulation exists between adjacent installation parts; an upper air duct structure and a lower air duct structure, the upper air duct structure is arranged on the upper end of the fixing part, the lower air duct structure is arranged on the lower end of the fixing part, and the upper air duct structure and the lower air duct structure are respectively provided with a first ventilation opening and a second ventilation opening. The upper air duct structure and the lower air duct structure form parallel air ducts, the electric core is subjected to convection heat exchange by sucking cold air in the external environment, the temperature of the electric core is reduced, and the temperature uniformity between the electric cores is good.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of batteries, in particular to a battery module. BACKGROUND

[0002] The battery module refers to a whole power supply unit formed by a plurality of batteries in series and parallel connection. Since the number of batteries is large, a large amount of heat is generated in the process of charging and discharging of the battery module. In order to ensure the stable operation of the system, the heat needs to be dissipated in time. At present, the heat dissipation is mainly achieved by air cooling. The cooling fan is arranged on one side of the battery cell, and the cooling air duct is arranged left and right or front and back. The cooling air duct is in series, and the heat is dissipated through a plurality of battery cells. Therefore, there is a problem of temperature difference between the front and back battery cells, and the heat dissipation is uneven. SUMMARY

[0003] The present application aims to at least solve one of the problems in the prior art. To this end, the present application provides a battery module which can improve the temperature uniformity between the battery cells in the module.

[0004] According to the battery module of the present application, a plurality of battery cells are arranged in the fixing member, and a passage for the upward and downward flow of gas is arranged between adjacent battery cells. An upper air duct structure and a lower air duct structure are arranged at the upper end and the lower end of the fixing member, respectively. The upper air duct structure and the lower air duct structure are respectively provided with a first ventilation opening and a second ventilation opening. The passage and the single battery cell are connected in parallel, and the two ends of each passage are connected with the upper air duct structure and the lower air duct structure.

[0005] According to the battery module of the present application, the heat dissipation air duct is formed by the parallel passage between the upper air duct structure, the lower air duct structure and the battery cells, and the air duct is in the upward and downward ventilation mode. The air duct can be arranged in the bottom air inlet and top air outlet mode, or in the top air inlet and bottom air outlet mode. The air in the external environment is used for convective heat exchange of the battery cells, so as to reduce the temperature of the battery cells. The cold air only passes through the passage between the single battery cells and is discharged, without repeated heat dissipation through a plurality of battery cells. The temperature difference between the battery cells is avoided, and the temperature uniformity between the battery cells is good.

[0006] According to some embodiments of the present application, the upper air duct structure and the lower air duct structure are wedge-shaped, and the upper air duct structure and the lower air duct structure are arranged in opposite directions.

[0007] According to some embodiments of the present application, the fixing member comprises a fixing frame, a first partition plate and a second partition plate, the first and second partition plates are arranged in the fixing frame, the first and second partition plates divide the fixing frame into several installation parts, the installation parts are used for placing the battery cells, the adjacent installation parts have the channel for the gas to flow up and down, and the bottom of the installation part is provided with a convex edge.

[0008] According to some embodiments of the present application, the middle part of the second partition plate is a hollow structure or the second partition plate is provided with a groove penetrating up and down.

[0009] According to some embodiments of the present application, further comprising a shell, the shell is open at the upper end, the fixing member is arranged in the shell, and the bottom of the shell is provided with a through hole.

[0010] According to some embodiments of the present application, the lower air duct structure is provided with a baffle.

[0011] According to some embodiments of the present application, the first ventilation opening is arranged on the side of the upper air duct structure, and the second ventilation opening is arranged on the side of the lower air duct structure.

[0012] According to some embodiments of the present application, the first ventilation opening is arranged on the side of the upper air duct structure, and the second ventilation opening is arranged on the bottom of the lower air duct structure.

[0013] According to some embodiments of the present application, the first ventilation opening or the second ventilation opening is provided with a fan.

[0014] According to some embodiments of the present application, the upper end of the battery cell is provided with a busbar.

[0015] Additional aspects and advantages of the present application will be given in part in the following description, become apparent from the following description, or be understood through practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0016] The above and / or additional aspects and advantages of the present application will become apparent and be readily understood from the following description, taken in conjunction with the accompanying drawings, in which:

[0017] Figure 1 is an exploded view of a battery module according to an embodiment of the present application;

[0018] Figure 2 is a structural schematic view of a battery module according to an embodiment of the present application;

[0019] Figure 3 is Figure 2 an A-A sectional view of

[0020] Figure 4Exploded view of a battery module according to another embodiment of the present application;

[0021] Figure 5 Structure diagram of a battery module according to another embodiment of the present application;

[0022] Figure 6 Structure diagram of a battery module according to another embodiment of the present application; Figure 5 B-B sectional view of the battery module. DETAILED DESCRIPTION

[0023] Embodiments of the present application are described in detail below with reference to the attached drawings, which show by way of example, embodiments in which the same or similar elements or elements having the same or similar functions are denoted by the same reference numerals throughout the drawings. The embodiments described below with reference to the drawings are exemplary and are intended to explain the present application only, and are not to be understood as limiting the present application.

[0024] In the description of the present application, it should be understood that the orientation description, such as the orientation or position relationship indicated by up, down, front, back, left, right, etc. is based on the orientation or position relationship shown in the drawings, and is only for the purpose of facilitating the description of the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0025] In the description of the present application, the meaning of several is one or more, the meaning of multiple is two or more, greater than, less than, more than, etc. are understood as not including the number, above, below, etc. are understood as including the number. If the first, second, etc. are described, they are only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or the order of technical features indicated.

[0026] In the description of the present application, unless otherwise explicitly limited, the words such as setting, installing, connecting, etc. should be broadly understood, and those skilled in the art can reasonably determine the specific meaning of the above words in the present application in combination with the specific content of the technical solution.

[0027] The battery module of the embodiment of the application comprises a plurality of battery cells 1, a fixing member 2, an upper air duct structure 3 and a lower air duct structure 4. The battery cells 1 are arranged in the fixing member 2, and the adjacent battery cells have a passage 7 for the up-and-down flow of gas. The upper air duct structure 3 is arranged at the upper end of the fixing member 2, and the lower air duct structure 4 is arranged at the lower end of the fixing member 2. The upper air duct structure 3 and the lower air duct structure 4 are respectively provided with a first ventilation opening 31 and a second ventilation opening 41. The passage 7 is connected in parallel with the single battery cell 1, and the two ends of each passage 7 are respectively connected with the upper air duct structure 3 and the lower air duct structure 4. In use, the first ventilation opening 31 or the second ventilation opening 41 is directed towards the air conditioner or the cooling fan equipped in the battery management system. The parallel passages 7 between the upper air duct structure 3, the lower air duct structure 4 and the battery cells form a heat dissipation air duct in an up-and-down ventilation mode, which can be a bottom-in and top-out mode or a top-in and bottom-out mode. The single passage 7 is connected in parallel between the single battery cells 1. Therefore, the external cooling air that cools the single battery cell 1 through the parallel passage 7 flows out of the battery module. Since each battery cell 1 is equipped with a respective passage 7 for the inlet and outlet of cooling air, the cooling effect of each battery cell 1 is not much different, and the temperature difference between the front and rear batteries does not exist. The temperature uniformity between the battery cells 1 in the module is improved, and the service life of the battery is prolonged.

[0028] Referring to Figure 1 , Figure 2 and Figure 3 , in some embodiments, the upper air duct structure 3 and the lower air duct structure 4 are both wedge-shaped, and the upper air duct structure 3 and the lower air duct structure 4 are arranged in opposite directions, so that the two wedge-shaped structures are complementary to each other and form a rectangular structure as a whole. The upper air duct structure 3 and the lower air duct structure 4 can be made of metal materials, plastic materials, etc. It is recommended to use flame-retardant and insulating plastic materials, which have good safety performance. After the upper air duct structure 3 and the lower air duct structure 4 are assembled, the upper air duct structure 3 and the lower air duct structure 4 are wedged with each other, which can reduce the space occupied by the upper air duct structure 3 and the lower air duct structure 4 and effectively improve the space utilization.

[0029] In some embodiments of the application, the second ventilation opening 41 is arranged on the side surface of the lower air duct structure 4, which facilitates the up-and-down stacking of the battery module. The second ventilation opening 41 is provided with a fan 42, which draws in the cooling air in the external environment to perform convective heat exchange with the battery cells 1 and reduce the temperature of the battery cells 1. This embodiment does not need to rely on external air conditioners or cooling fans, but draws in or exhausts air through the fan 42 provided by itself. The fan 42 can also be provided in one or more. The first ventilation opening 31 is arranged on the side surface of the thicker wedge-shaped structure, which can be circular, rectangular or other shapes, or the thicker side surface can be removed to form a larger air outlet surface. In some embodiments, the fan 42 can also be arranged on the first ventilation opening 31.

[0030] The lower air duct structure 4 is provided with baffles 43, and the number of the baffles 43 is several. The baffles 43 can be curved surface structures or flat plate structures, which are used for adjusting air flow and enabling air to be uniformly distributed into the channels 7 between each battery cell 1 for convection heat exchange. The baffles 43 can be separately installed or integrally formed with the lower air duct structure 4, for example, integrally formed by mold injection

[0031] In some embodiments of the present application, the fixing member 2 comprises a fixing frame 21, a first partition plate 22 and a second partition plate 23, the first partition plate 22 and the second partition plate 23 are arranged in the fixing frame 21, the first partition plate 22 is arranged on the second partition plate 23 or the fixing frame 21 and perpendicular to the second partition plate 23, the first partition plate 22 and the second partition plate 23 divide the fixing frame 21 into several rectangular mounting portions, the battery cell 1 is placed in the mounting portion, the second partition plate 23 is provided with the channels 7 for gas to flow up and down, and the bottom of the mounting portion is provided with a convex edge 24 for abutting against the bottom of the battery cell 1 to prevent the battery cell 1 from sliding down.

[0032] Referring to Figure 1 , the middle part of the second partition plate 23 is a hollow structure, which constitutes the channels 7 for gas to flow up and down when the battery cell 1 is placed. It is conceivable that the second partition plate 23 is provided with a recess penetrating up and down, which also constitutes the channels 7 for gas to flow up and down.

[0033] The battery module of the embodiment of the present application further comprises a shell 5, the shell 5 is open at the upper end, the fixing member 2 is arranged in the shell 5, the bottom of the shell 5 is provided with a through hole 51, the lower end of the shell 5 is provided with the lower air duct structure 4, and the upper end of the shell 5 is provided with the upper air duct structure 3. The shell 5 is used for protecting the fixing member 2 and the internal battery cell 1. Specifically, the through hole 51 can be one or more, the through hole 51 is located below the channel 7, and the shape of the through hole 51 is not limited, for example, the shape of the through hole 51 is strip-shaped, circular or square. The through hole 51 is arranged to make the lower air duct structure 4, the shell 5, the fixing member 2 and the upper air duct structure 3 communicate with each other at the upper and lower ends, so as to facilitate the flow of gas.

[0034] In some embodiments of the present application, the upper end of the battery cell 1 is provided with a busbar 6. The busbar 6 can be made of materials with good conductivity, such as aluminum bars or copper bars, and is used for connecting the battery cell 1 and external wires.

[0035] Referring to Figures 4 to 6Another embodiment of the present application includes several battery cells 1, a fixing member 2, an upper air duct structure 3 and a lower air duct structure 4. The battery cells 1 are arranged in the fixing member 2, and the adjacent battery cells have a passage 7 for the up-and-down flow of gas; the upper air duct structure 3 is arranged at the upper end of the fixing member 2, and the lower air duct structure 4 is arranged at the lower end of the fixing member 2, and the upper air duct structure 3 and the lower air duct structure 4 are respectively provided with a first air vent 31 and a second air vent 41; the passage 7 is connected in parallel with the single battery cell 1, and the two ends of each passage 7 are respectively connected with the upper air duct structure 3 and the lower air duct structure 4. The battery module of the embodiment further includes a shell 5, the shell 5 is open at the upper end, the fixing member 2 is arranged in the shell 5, the shell 5 is provided with a through hole 51 at the bottom, the lower end of the shell 5 is provided with the lower air duct structure 4, and the upper end of the shell 5 is provided with the upper air duct structure 3. The shell 5 is used for protecting the fixing member 2 and the internal battery cells 1.

[0036] Referring to Figure 4 The upper air duct structure 3 and the lower air duct structure 4 are both rectangular frames, and the upper air duct structure 3 is provided with a first air vent 31 on one side. The second air vent 41 is arranged at the bottom of the lower air duct structure 4, and specifically, the bottom of the lower air duct structure 4 is provided with four second air vents 41, and each second air vent 41 is provided with a fan 42 at the bottom. The fan 42 sucks the external air and makes it flow through the passage 7 and the upper air duct structure 3 to be discharged, and the external air cools each battery cell 1 through the parallel passage 7.

[0037] The embodiment adopts the mode of bottom air inlet and top air outlet, and the single passage 7 is connected in parallel between the single battery cell 1, so that the external cooling air cools the single battery cell 1 through the parallel passage 7 and then flows out of the battery module. Since each battery cell 1 is equipped with its own passage 7 for cooling air inlet and outlet, the cooling effect of each battery cell 1 is not much different, and there is no problem of temperature difference between the front and rear batteries, which can improve the temperature uniformity between the battery cells 1 in the module and improve the service life of the battery.

Claims

1. A battery module, characterized by, The application relates to a battery cell fixing device. The battery cell fixing device comprises: a plurality of battery cells (1); a fixing member (2), wherein the battery cells (1) are arranged in the fixing member (2), and a channel (7) for the up-and-down circulation of gas is arranged between adjacent battery cells; the fixing member (2) comprises a fixing frame (21), a first partition plate (22) and a second partition plate (23), the first partition plate (22) and the second partition plate (23) are arranged in the fixing frame (21), the fixing frame (21) is divided into a plurality of mounting portions by the first partition plate (22) and the second partition plate (23), the mounting portions are used for placing the battery cells (1), the channel (7) for the up-and-down circulation of gas is arranged between adjacent mounting portions, and a convex edge (24) is arranged at the bottom of the mounting portion; an upper air duct structure (3) and a lower air duct structure (4), wherein the upper air duct structure (3) is arranged at the upper end of the fixing member (2), the lower air duct structure (4) is arranged at the lower end of the fixing member (2), and a first air vent (31) and a second air vent (41) are respectively arranged on the upper air duct structure (3) and the lower air duct structure (4); wherein the channel (7) and the single battery cell (1) are connected in parallel, the two ends of each channel (7) are communicated with the upper air duct structure (3) and the lower air duct structure (4) respectively, and a plurality of baffles are arranged on the lower air duct structure, the baffles are used for adjusting the air flow, and the air can be uniformly distributed into the channel between each battery cell for convection heat exchange. The upper air duct structure (3) and the lower air duct structure (4) are wedge-shaped, and the upper air duct structure (3) and the lower air duct structure (4) are arranged in opposite directions.

2. The battery module of claim 1, wherein: The middle part of the second partition plate (23) is a hollow structure, or a recess penetrating through the upper and lower parts of the second partition plate (23) is arranged on the second partition plate (23).

3. The battery module of claim 1, wherein: The battery cell fixing device further comprises a shell (5), the shell (5) is open at the upper end, the fixing member (2) is arranged in the shell (5), and a through hole (51) is arranged at the bottom of the shell (5).

4. The battery module of claim 1, wherein: The first air vent (31) is arranged on the side surface of the upper air duct structure (3), and the second air vent (41) is arranged on the side surface of the lower air duct structure (4).

5. The battery module of claim 1, wherein: The first air vent (31) is arranged on the side surface of the upper air duct structure (3), and the second air vent (41) is arranged on the bottom surface of the lower air duct structure (4).

6. The battery module of claim 1, wherein: A fan (42) is arranged on the first air vent (31) or the second air vent (41).

7. The battery module of claim 1 or 5 or 6, wherein: The upper end of the battery cell (1) is provided with a busbar (6).

8. The battery module of claim 1, wherein: ​

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