Battery pack

Abstract

The utility model provides a battery pack. The battery pack comprises a box body, at least one battery cell group and an air cooling device, an accommodating cavity is formed in the box body; the at least one battery cell group is arranged in the accommodating cavity, each battery cell group comprises a plurality of battery cells, and a first flow channel is formed between every two adjacent battery cells; the air cooling device is arranged in the containing cavity and located at the first air inlets of the multiple first flow channels, and the air cooling device is used for conveying air cooling media in the multiple first flow channels. The utility model aims to solve the technical problems of non-uniform overall temperature and high possibility of thermal runaway caused by high temperature in the middle area of the battery pack in the prior art.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery pack. Background Art

[0002] Thermal management has always been the focus of new energy vehicles. As the energy density and power density of new energy vehicle power batteries become higher and higher, the heat generated by the batteries increases. Liquid cooling systems with the characteristics of fast cooling speed, large specific volume, and high heat transfer coefficient have gradually become the mainstream heat dissipation method. In related technologies, liquid cooling plates are often set above or below the battery pack to cool both ends of the battery pack, resulting in excessively high temperatures in the middle area of ​​the battery pack, uneven overall temperature of the battery pack, and prone to thermal runaway. Utility Model Content

[0003] An embodiment of the present utility model provides a battery pack, which aims to solve the technical problem in the related art that the temperature in the middle area of ​​the battery pack is high, resulting in uneven overall temperature and easy occurrence of thermal runaway.

[0004] In a first aspect, an embodiment of the present invention provides a battery pack, comprising:

[0005] The box body is formed with a receiving cavity;

[0006] At least one battery cell group is disposed in the accommodating cavity, wherein the at least one battery cell group includes a plurality of battery cells, and a first flow channel is formed between two adjacent battery cells;

[0007] An air cooling device is provided in the accommodating cavity and is located at the first air inlet of the plurality of first flow channels, for conveying air cooling medium into the plurality of first flow channels.

[0008] In one embodiment, a plurality of cooling plates are further included, wherein one cooling plate is provided between two adjacent battery cells, and the first flow channel is formed in the cooling plate.

[0009] In one embodiment, the air cooling device includes an air guide plate and a fan assembly, the air guide plate has at least one second air inlet and multiple second air outlets, at least one second air outlet is arranged in alignment with the first air inlet of each cooling plate, and the fan assembly is located at the second air inlet.

[0010] In one embodiment, the fan assembly includes a fan body and a mounting bracket, the mounting bracket is fixed in the box and is located at the second air inlet of the air guide plate, an air guide channel is formed in the mounting bracket, the air guide channel has a third air inlet and a third air outlet, the third air outlet is connected to the second air inlet of the air guide plate, and the fan body is located at the third air inlet.

[0011] In one embodiment, an electrical component is further included, wherein the electrical component is disposed on one side of the plurality of battery core groups close to the fan component and below the fan component;

[0012] The mounting bracket includes a first part and a second part connected in sequence, the fan body is mounted on the first part, the air guide channel is formed in the second part, and the first part is further provided with a first opening on a side facing the electrical component.

[0013] In one embodiment, the second portion has a first side and a second side adjacent to each other, the first side is connected to the first portion, and the third air inlet and the third air outlet are formed on the first side and the second side, respectively.

[0014] In one embodiment, a side of the second portion facing away from the first portion is in an arc shape, and the side of the second portion facing away from the first portion is curved in a direction away from the first portion.

[0015] In one embodiment, the air cooling device further includes air guide cotton, which is arranged between the air guide plate and the plurality of battery cell groups. A plurality of first air ducts are formed on the air guide cotton, and one end of each of the first air ducts is arranged to be aligned with the first air inlet, and the other end of each of the first air ducts is arranged to be aligned with the corresponding second air outlet.

[0016] In one embodiment, the side of each cooling plate away from the air guide plate is the first side, and the side of each battery cell away from the air guide plate is the second side. In the height direction of the box, the height of the first side is higher than the height of the second side.

[0017] In one embodiment, in the battery cell group, a plurality of the battery cells are spaced apart along the length direction of the box.

[0018] Beneficial effects of the embodiments of the present utility model:

[0019] In the technical solution of the present utility model, a first flow channel is formed between two adjacent battery cells, and an air cooling device is arranged at the first air inlet of the multiple first flow channels. The air cooling device transports the air cooling medium into the first flow channel to cool the battery cells. Such an arrangement can achieve cooling of each battery cell, avoid the temperature in the middle area of ​​the battery pack being too high due to the arrangement of the battery cells, reduce the temperature difference between the battery cells, and release the capacity of the battery cells to the ideal usage energy as completely as possible, so that the battery pack can work in an ideal environment as much as possible, thereby extending the service life of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0021] Figure 1 is a three-dimensional schematic diagram of a battery pack provided by an embodiment of the present utility model;

[0022] Figure 2 yes Figure 1 Schematic diagram of the explosion of the battery pack;

[0023] Figure 3 yes Figure 1 A full cross-sectional diagram of the battery pack;

[0024] Figure 4 yes Figure 3 A is an enlarged schematic diagram;

[0025] Figure 5 yes Figure 1 Schematic diagram of the coordination between the middle box and the air cooling device;

[0026] Figure 6 yes Figure 5 A magnified schematic diagram of B in the middle;

[0027] Figure 7 yes Figure 1 Schematic diagram of the structure of the fan assembly;

[0028] Figure 8 yes Figure 7 Schematic diagram of the structure of the mounting bracket.

[0029] Explanation of Figure Numbers

[0030]

[0031] DETAILED DESCRIPTION

[0032] The following will clearly and completely describe the technical solutions in the embodiments of the present invention 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, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention. In addition, it should be understood that the specific implementation methods described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention. In the present invention, unless otherwise specified, the directional words used, such as "upper" and "lower", generally refer to the upper and lower parts of the device in actual use or working state, specifically the drawing direction in the accompanying drawings; while "inside" and "outside" refer to the outline of the device.

[0033] Thermal management has always been the focus of new energy vehicles. As the energy density and power density of new energy vehicle power batteries become higher and higher, the heat generated by the batteries increases. Liquid cooling systems with the characteristics of fast cooling speed, large specific volume, and high heat transfer coefficient have gradually become the mainstream heat dissipation method. In related technologies, liquid cooling plates are often set above or below the battery pack to cool both ends of the battery pack, resulting in excessively high temperatures in the middle area of ​​the battery pack, uneven overall temperature of the battery pack, and prone to thermal runaway.

[0034] In view of this, the present invention proposes a battery pack 100. Figures 1 to 8 This is a structural schematic diagram of an embodiment of a battery pack 100 provided by the present invention. The battery pack 100 provided by the present invention has high cooling efficiency, high safety, and low probability of thermal runaway. The battery pack 100 will be described in detail below in conjunction with the main drawings.

[0035] See also Figure 1 、 Figure 2 、 Figure 3 and Figure 4 The utility model provides a battery pack 100, which includes a box body 1, at least one battery cell group 2 and an air cooling device 3; the box body 1 is formed with a accommodating cavity; multiple battery cell groups 2 are arranged in the accommodating cavity, at least one battery cell group 2 includes multiple battery cells 21, and a first flow channel 221 is formed between two adjacent battery cells 21; the air cooling device 3 is arranged in the accommodating cavity, and the air cooling device 3 is located at the first air inlet of the multiple first flow channels 221, and is used to transport air cooling medium in the multiple first flow channels 221.

[0036] In the technical solution of the present utility model, a first flow channel 221 is formed between two adjacent battery cells 21, and the air cooling device 3 is arranged at the first air inlet of the multiple first flow channels 221. The air cooling device 3 transports the air cooling medium into the first flow channel 221 to cool the battery cells 21. Such an arrangement can achieve cooling of each battery cell 21, avoid the temperature in the middle area of ​​the battery pack 100 being too high due to the arrangement of the battery cells 21, reduce the temperature difference between the battery cells 21, and release the capacity of the battery cell 21 to the ideal usage energy as completely as possible, so that the battery pack 100 can work in an ideal environment as much as possible, thereby extending the service life of the battery pack 100.

[0037] In this embodiment, for the convenience of description, Figure 1 Taking the first direction as an example, the first direction is the length direction of the box 1, the second direction is the width direction of the box 1, and the third direction is the height direction of the box 1.

[0038] It should be noted that the number of cell groups 2 is not limited and can be set according to actual circumstances. In this embodiment, four cell groups 2 are provided, arranged in a matrix. To improve cooling efficiency, a second flow channel can also be provided between two adjacent cell groups 2. The flow channel inlet of the second flow channel is connected to the air cooling device 3, so that the air cooling device 3 can transport air cooling medium into the second flow channel. The second flow channel cools multiple sides of the cell group 2, improving cooling efficiency and preventing heat concentration in the central area of ​​the battery pack 100, which cannot be smoothly discharged and can cause thermal runaway.

[0039] It should be noted that the formation method of the first flow channel 221 is not limited. In some embodiments, a plurality of battery cells 21 are arranged at intervals, and a certain gap is reserved between two adjacent battery cells 21. This gap is the first flow channel 221. Such an arrangement can save space and improve space utilization. In another embodiment, a plurality of cooling plates 22 are provided in the battery pack 100, and a first flow channel 221 is formed in each cooling plate 22. A cooling plate 22 is provided between two adjacent battery cells 21. The provision of the cooling plate 22 can facilitate the fixation of the battery cell group 2. The plurality of battery cells 21 and the plurality of cooling plates 22 are arranged in sequence. After the arrangement is completed, a clamping force is applied thereto so that the battery cells 21 and the cooling plates 22 are in close contact with each other, and then fixed with a cable tie to complete the assembly of the battery cell group 2. Such an arrangement facilitates the fixation and assembly of the battery cells 21. At the same time, the battery cells 21 and the cooling plates 22 are in close contact with each other, which can improve the cooling efficiency.

[0040] Furthermore, each cooling plate 22 is internally provided with multiple partitions, which are spaced apart to separate the first flow channel 221 into multiple first sub-flow channels. The partitions are provided to enhance the structural strength of the cooling plate 22 and prevent deformation of the cooling plate 22 when a clamping force is applied, which could block the first flow channel 221 and reduce cooling efficiency. Furthermore, the partitions transfer heat, increasing the contact area between the cooling plate 22 and the air-cooling medium, thereby improving the heat dissipation efficiency of the air-cooling device 3 and enhancing the safety of the battery pack 100.

[0041] Please continue reading Figure 3 In this embodiment, the air cooling device 3 includes an air guide plate 31 and a fan assembly 32. The specific position of the air guide plate 31 is not limited, as long as it can transmit the air-cooling medium delivered by the fan assembly 32 to the cooling plate 22. Taking into account the issue of space utilization, the air guide plate 31 is set at the top of the box body 1, and the air guide plate 31 is located between the top of the box body 1 and the multiple battery cell groups 2. The air guide plate 31 has at least one second air inlet 311 and multiple second air outlets 312. Each second air outlet 312 is arranged in alignment with the first air inlet of each cooling plate 22, and the fan assembly 32 is located at the second air inlet 311. During the actual heat dissipation process, the air-cooling medium delivered by the fan assembly 32 enters the cooling plate 22 from the second air inlet 311, flows out from the multiple second air outlets 312 of the cooling plate 22, and flows into the cooling plate 22 through the first air inlet of the cooling plate 22, thereby cooling the multiple battery cells 21.

[0042] Further, in some embodiments, see Figure 5 and Figure 6 The fan assembly 32 includes a fan body 321 and a mounting bracket 322. The fan body 321 is mounted on the mounting bracket 322, and the mounting bracket 322 is fixed in the box 1. In this way, the fan body 321 can be fixed in the box 1. More specifically, the mounting bracket 322 is located at the second air inlet 311 of the air guide plate 31, so that the air-cooling medium delivered by the fan body 321 can flow into the air guide plate 31. Figure 7 An air guide channel 323 is formed in the mounting bracket 322. The air guide channel 323 has a third air inlet 3231 and a third air outlet 3232. The third air outlet 3232 is connected to the second air inlet 311 of the air guide plate 31, and the fan body 321 is located at the third air inlet 3231. During the actual heat dissipation process, the cooling medium delivered by the fan body 321 enters the air guide channel 323 through the third air inlet 3231, then flows out from the third air outlet 3232, flows into the air guide plate 31, and then flows out from the multiple second air outlets 312 of the cooling plate 22. It then flows into the cooling plate 22 through the first air inlet of the cooling plate 22, thereby cooling the multiple battery cells 21.

[0043] It should be noted that the specific type of the fan body 321 is not limited, as long as it can transport the cold air medium. In this embodiment, the fan body 321 is a turbo fan.

[0044] In some embodiments, see Figure 3 The battery pack 100 also includes an electrical component, which is arranged on one side of the multiple battery cell groups 2 close to the fan component 32 and is located below the fan component 32. This arrangement allows part of the air-cooling medium output by the fan component 32 to be transmitted to the electrical component to cool the electrical component, so that the overall temperature of the battery pack 100 is balanced and local overtemperature is avoided.

[0045] More specifically, in some embodiments, see Figure 7 The mounting bracket 322 includes a first portion 3221 and a second portion 3222 connected in sequence. The fan body 321 is mounted on the first portion 3221 . An air guide channel 323 is formed in the second portion 3222 . The third air inlet 3231 of the air guide channel 323 corresponds to the first portion 3221 . There is no limitation on the specific type of the first part 3221, as long as the fan body 321 can be installed and fixed. In this embodiment, the first part 3221 includes four support plates, which are installed on the box body 1. A accommodating cavity is formed between the four support plates and the box wall of the box body 1. The fan body 321 is installed in the accommodating cavity. The four support plates form a first opening a on the side of the box wall facing away from the box body 1. The first opening a is set toward the electrical component. Part of the air-cooling medium output by the fan body 321 flows from the first opening a to the electrical component to cool the electrical component. A second opening is provided on a support plate connected to the second part 3222, and the second opening corresponds to the dot air inlet, so that the air-cooling medium output by the fan body 321 can enter the air guide channel 323.

[0046] It should be noted that the specific locations of the third air inlet 3231 and the third air outlet 3232 are not limited and can be arranged according to the position of the fan body 321. In this embodiment, the second portion 3222 has a first side b and a second side c adjacent to each other. More specifically, the first side b corresponds to the first portion 3221. The first side b is the side of the second portion 3222 arranged along the width of the housing 1, and the second side c is the side of the second portion 3222 arranged along the length of the housing 1. The third air inlet 3231 and the third air outlet 3232 are formed on the first side b and the second side c, respectively. This arrangement allows the first portion 3221 and the second portion 3222 to be arranged side by side, saving space. It also ensures that the cooling medium output from the fan body 321 is smoothly transferred to the air guide plate 31.

[0047] Furthermore, to ensure that the cooling medium can flow smoothly into the air guide plate 31, a diversion structure is provided on the second portion 3222. Specifically, the side of the second portion 3222 facing away from the first portion 3221 is arc-shaped, and the side of the second portion 3222 facing away from the first portion 3221 is curved in a direction away from the first portion 3221. Because one side of the second portion 3222 is arc-shaped, when the cooling medium enters the air guide channel 323, it contacts the arc-shaped sidewall, changing the wind direction and flowing toward the third air outlet 3232, outflowing from the third air outlet 3232. The arc shape can change the flow direction of the cooling medium, preventing the cooling medium from being retained in the air guide channel 323, thereby forming a wind vortex. This can reduce air volume loss to a certain extent, thereby improving the cooling efficiency of the battery pack 100.

[0048] See also Figure 1 In some embodiments, the air cooling device 3 further includes air guides 33, which are positioned between the air guide plate 31 and the multiple battery cell groups 2. The air guides 33 can act as a buffer to prevent damage to the internal structure of the battery pack 100 during transportation or installation. Furthermore, to ensure that the cooling medium can flow smoothly into the first flow channel 221 to cool the battery cell groups 2, the air guides 33 are formed with multiple first air channels 331, each corresponding to a first flow channel 221. Specifically, one end of each first air channel 331 is aligned with the first air inlet, and the other end of each first air channel 331 is aligned with the corresponding second air outlet 312. During the actual heat dissipation process, the air-cooling medium in the air guide plate 31 flows out from the multiple second air outlets 312 respectively, flows into the multiple first air ducts 331 of the air guide cotton 33, and then flows into the first flow channel 221 from the multiple first air ducts 331 of the air guide cotton 33, cooling the multiple battery cells 21, avoiding the temperature of the battery pack 100 from being too high, reducing the temperature difference between the battery cells 21, and allowing the capacity of the battery cells 21 to be released as completely as possible to the ideal usage energy, so that the battery pack 100 can work in an ideal environment as much as possible, thereby extending the service life of the battery pack 100.

[0049] In some embodiments, the battery pack 100 also includes a liquid cooling plate, multiple battery cell groups 2 are arranged on the liquid cooling plate, and the box body 1 cover is arranged on the liquid cooling plate. In this way, by combining air cooling and liquid cooling, the cooling efficiency of the battery is improved, so that the battery pack 100 can work in an ideal environment as much as possible, thereby extending the service life of the battery pack 100.

[0050] In some embodiments, each cooling plate 22 is further provided with a first air outlet. After the cooling plate 22 cools the battery cells 21, the higher-temperature cooling medium flows out of the first air outlet, thereby forming a cooling cycle. Specifically, the side of each cooling plate 22 away from the air guide plate 31 is a first side, and the side of each battery cell 21 away from the air guide plate 31 is a second side. In the height direction of the housing 1, the first side is higher than the second side. As a result, since the battery cell group 2 is disposed on the liquid cooling plate, the battery cell group 2 is generally in close contact with the liquid cooling plate to ensure a tight connection. Therefore, when the height of the first side is higher than the height of the second side, a gap is formed between the cooling plate 22 and the liquid cooling plate. This gap serves as the first air outlet. With this arrangement, when the higher-temperature cooling medium flows out of the cooling plate 22, it can come into contact with the liquid cooling plate, which can reduce the temperature of the cooling medium, thereby improving the cooling effect of the cooling cycle, allowing the battery pack 100 to operate in an ideal environment as much as possible, thereby extending the service life of the battery pack 100.

[0051] It should be noted that the specific shape of the battery cell 21 is not limited. It can be a cylindrical battery cell, a square battery cell, or a long blade battery cell. It can be selected according to actual conditions. In this embodiment, the battery cell 21 is a long blade battery cell. In the battery cell group 2, multiple long blade battery cells are arranged at intervals along the length direction of the box 1. Such an arrangement makes the two large sides of the long blade battery cell relatively arranged along the length direction of the box 1, and the two small sides of the long blade battery cell are relatively arranged along the width direction of the box 1. Multiple cooling plates are arranged along the length direction of the box, so that the cooling plate 22 can contact the large sides of two adjacent battery cells 21, so that the cooling plate 22 can contact more volume of battery cells 21, improve the cooling efficiency of the cooling plate 22, reduce the temperature difference between the battery cells 21, and make the capacity of the battery cell 21 as completely as possible released to the ideal usage energy, so that the battery pack 100 can work in an ideal environment as much as possible, thereby extending the service life of the battery pack 100.

[0052] The present invention also provides an electrical device including the battery pack 100. The specific structure of the battery pack 100 is described in detail in the above embodiments. Since the present electrical device utilizes all the technical solutions of all the above embodiments, it at least has all the beneficial effects brought about by the technical solutions of the above embodiments, and therefore will not be described in detail here.

[0053] It is understood that electrical equipment includes, but is not limited to, electric toys, power tools, electric vehicles, cars, ships, spacecraft, and the like. Electric toys may include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys. Spacecraft may include airplanes, rockets, space shuttles, and spacecraft. Cars may include gasoline-powered cars, gas-powered cars, and new energy vehicles.

[0054] The above is a detailed introduction to the embodiments of the present invention. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there may be changes in the specific implementation methods and application scope. In summary, the contents of this specification should not be understood as limiting the present invention.

Claims

1. A battery pack, characterized in that: include: A box body (1) is formed with a receiving cavity; At least one battery cell group (2) is disposed in the accommodating cavity, wherein the at least one battery cell group (2) includes a plurality of battery cells (21), and a first flow channel (221) is formed between two adjacent battery cells (21); An air cooling device (3) is provided in the accommodating cavity, and the air cooling device (3) is located at the first air inlet (2211) of the plurality of first flow channels (221), and is used to transport air cooling medium in the plurality of first flow channels (221).

2. The battery pack according to claim 1, wherein: It also includes a plurality of cooling plates (22), one cooling plate (22) being provided between two adjacent battery cells (21), and the first flow channel (221) being formed in the cooling plate (22).

3. The battery pack according to claim 2, wherein: The air cooling device (3) comprises an air guide plate (31) and a fan assembly (32); the air guide plate (31) has at least one second air inlet (311) and a plurality of second air outlets (312); at least one second air outlet (312) is arranged in alignment with the first air inlet (2211) of each cooling plate (22); and the fan assembly (32) is located at the second air inlet (311).

4. The battery pack according to claim 3, wherein: The fan assembly (32) includes a fan body (321) and a mounting bracket (322), wherein the mounting bracket (322) is fixed in the box (1) and is located at the second air inlet (311) of the air guide plate (31), and an air guide channel (323) is formed in the mounting bracket (322), wherein the air guide channel (323) has a third air inlet (3231) and a third air outlet (3232), wherein the third air outlet (3232) is connected to the second air inlet (311) of the air guide plate (31), and the fan body (321) is located at the third air inlet (3231).

5. The battery pack according to claim 4, characterized in that: It also includes an electrical component (5), which is arranged on one side of the plurality of battery core groups (2) close to the fan component (32) and is located below the fan component (32); The mounting bracket (322) comprises a first portion (3221) and a second portion (3222) connected in sequence, the fan body (321) is mounted on the first portion (3221), the air guide channel (323) is formed in the second portion (3222), and the first portion (3221) is further provided with a first opening (a) on a side facing the electrical component (5).

6. The battery pack according to claim 5, characterized in that: The second part (3222) has an adjacent first side (b) and a second side (c), the first side (b) is connected to the first part (3221), and the third air inlet (3231) and the third air outlet (3232) are respectively formed on the first side (b) and the second side (c).

7. The battery pack according to claim 6, characterized in that: The side of the second portion (3222) away from the first portion (3221) is in an arc shape, and the side of the second portion (3222) away from the first portion (3221) is bent in a direction away from the first portion (3221).

8. The battery pack according to any one of claims 3 to 7, characterized in that: The air cooling device (3) further comprises an air guide cotton (33), the air guide cotton (33) being arranged between the air guide plate (31) and the plurality of battery cell groups (2), and a plurality of first air ducts (331) being formed on the air guide cotton (33), one end of each of the first air ducts (331) being arranged in alignment with the first air inlet (2211), and the other end of each of the first air ducts (331) being arranged in alignment with the corresponding second air outlet (312).

9. The battery pack according to any one of claims 3 to 7, characterized in that: The side of each cooling plate (22) away from the air guide plate (31) is a first side, and the side of each battery cell (21) away from the air guide plate (31) is a second side. In the height direction of the box body (1), the height of the first side is higher than the height of the second side.

10. The battery pack according to any one of claims 1 to 7, characterized in that: In the battery cell group (2), a plurality of battery cells (21) are arranged at intervals along the length direction of the box (1).

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