Battery pack and electric device

Abstract

The utility model discloses a battery pack and a power utilization device, the battery pack has a first direction and comprises a box body, a plurality of single batteries and a plurality of heat insulation parts, the box body is provided with an accommodating cavity, the plurality of single batteries are arranged along the first direction, and each single battery comprises a first terminal and a second terminal which are oppositely arranged along the first direction; two adjacent single batteries comprise a first battery and a second battery, and a first terminal of the first battery is connected with a second terminal of the second battery; a heat insulation part is arranged between every two adjacent battery monomers, each heat insulation part is provided with an avoiding space penetrating in the first direction, and at least part of the first terminal and at least part of the second terminal which are connected are arranged in the avoiding space in a penetrating manner. The terminals of the two adjacent battery monomers are in butt joint and conductive connection, so that the weight of the battery pack is reduced; the heat insulation part is arranged between the two adjacent battery monomers, and the heat insulation part is provided with the avoiding space for avoiding the terminal, so that the heat insulation part and the battery monomers can be conveniently assembled, and heat transmission can be blocked.

Description

Technical Field

[0001] This application belongs to the field of battery technology, specifically relating to a battery pack and an electrical device. Background Technology

[0002] As a crucial energy storage component, the battery pack contains multiple battery cells connected in series and parallel to achieve its intended capacity. However, during charging and discharging, some individual battery cells may experience excessive temperature rise. In such cases, the heat from the overheated cell can be transferred to adjacent cells, posing a risk of thermal runaway and reducing the battery pack's safety. Utility Model Content

[0003] The purpose of this utility model is to provide a battery pack that addresses the problem that excessive temperature rise in a single battery cell can be transmitted to adjacent battery cells, leading to a risk of thermal runaway in the battery pack. Another purpose of this application is to provide an electrical device.

[0004] Technical solution: A battery pack according to an embodiment of this application has a first orientation, including:

[0005] The box-shaped enclosure has a receiving cavity;

[0006] Multiple battery cells are arranged along the first direction. Each battery cell includes a first terminal and a second terminal that are disposed opposite to each other along the first direction. Two adjacent battery cells include a first battery and a second battery. The first terminal of the first battery is connected to the second terminal of the second battery.

[0007] Multiple heat insulation components are provided, with one heat insulation component disposed between two adjacent battery cells. The heat insulation component has a clearance space that extends through the heat insulation component along the first direction. At least a portion of the first terminal and at least a portion of the second terminal are connected and pass through the clearance space.

[0008] In some embodiments, a portion of the second terminal is disposed around the outside of the first terminal, and the inner diameter of the clearance space is greater than or equal to the outer diameter of the second terminal.

[0009] In some embodiments,

[0010] The battery cell includes:

[0011] The first side, wherein the first terminal is disposed on the first side;

[0012] The second side is disposed opposite to the first side along the first direction, and the second terminal is disposed on the second side.

[0013] The heat insulation component includes:

[0014] The third side is attached to the first side of the first battery;

[0015] The fourth side is disposed opposite to the third side along the first direction, and the fourth side is attached to the second side of the second battery.

[0016] In some embodiments,

[0017] The battery cell has a first groove, which extends through the first side and the second side of the battery cell along the first direction.

[0018] The heat insulation component has a second groove that extends through the third side and the fourth side along the first direction;

[0019] Along the first direction, the orthographic projection of the third side onto the first battery is located on the first side, and the orthographic projection of the fourth side onto the second battery is located on the second side.

[0020] In some embodiments, the third side is bonded to the first side, and the fourth side is bonded to the second side.

[0021] In some embodiments, the area of ​​the first side is S1 mm. 2 The area of ​​the second side is S2 mm. 2 The area of ​​the third side is S3 mm. 2 The area of ​​the fourth side is S4 mm. 2 The following conditions must be met: 70% ≤ S3 / S1 ≤ 100%, 70% ≤ S4 / S2 ≤ 100%.

[0022] In some embodiments, the third side has the same shape as the first side, and the fourth side has the same shape as the second side.

[0023] In some embodiments, the thermal insulation component is any one of an aerogel board, a nanoboard, or a ceramic fiber board.

[0024] In some embodiments, the heat insulation element is an elastic element, and the heat insulation element is clamped between two adjacent battery cells.

[0025] Accordingly, the electrical device described in this application includes a battery pack as described in any of the foregoing embodiments.

[0026] Beneficial effects: Compared with the prior art, a battery pack according to an embodiment of this application has a first direction, including a housing, multiple battery cells and multiple heat insulation components. The housing has a receiving cavity. The multiple battery cells are arranged along the first direction. Each battery cell includes a first terminal and a second terminal arranged opposite to each other along the first direction. Two adjacent battery cells include a first battery and a second battery. The first terminal of the first battery is connected to the second terminal of the second battery. A heat insulation component is provided between two adjacent battery cells. The heat insulation component has a clearance space. The clearance space passes through the heat insulation component along the first direction. At least a portion of the connected first terminal and at least a portion of the second terminal pass through the clearance space. In this application, the terminals of two adjacent battery cells are connected to each other, which eliminates the need for busbars and other structures. This ensures the stability of the conductive connection of the battery cells, reduces the weight of the battery pack, and facilitates battery pack assembly. A heat insulation component is provided between two adjacent battery cells, with clearance space to avoid the battery cell terminals. This facilitates the assembly of the heat insulation component with the battery cells. Furthermore, the heat insulation component can be spaced between adjacent battery cells, blocking the heat propagation of the thermally runaway battery cell in the event of thermal runaway, thus acting as a heat barrier. At the same time, it provides expansion gaps and buffers for the battery cells, preventing terminal deformation caused by vibration during battery cell expansion from affecting the conductive connection, and distributing stress.

[0027] Compared with the prior art, an electrical device according to an embodiment of this application includes a battery pack as described in any of the foregoing embodiments. It is understood that the electrical device of this application includes all the technical features and effects of the aforementioned battery pack, which will not be repeated here. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is a schematic diagram of the overall structure of a battery pack according to an embodiment of this application;

[0030] Figure 2 This is an exploded view of a battery pack according to an embodiment of this application;

[0031] Figure 3 This is a schematic diagram of the structure of a battery cell at one angle according to an embodiment of this application;

[0032] Figure 4 This is a schematic diagram of the structure of a battery cell from another angle according to an embodiment of this application;

[0033] Figure 5 This is a schematic diagram of the overall structure of a heat insulation component according to an embodiment of this application;

[0034] Figure 6 This is a schematic diagram illustrating the positional relationship between two adjacent battery cells and a heat insulation component according to an embodiment of this application.

[0035] Figure 7 This is a cross-sectional view of two adjacent battery cells connected to a heat insulation component according to an embodiment of this application.

[0036] Explanation of reference numerals in the attached figures:

[0037] 100, housing; 110, receiving cavity; 200, battery cell; 210, first terminal; 220, second terminal; 230, first side; 240, second side; 250, first groove; 260, first battery; 270, second battery; 300, heat insulation component; 310, clearance space; 320, third side; 330, fourth side; 340, second groove; X, first direction. Detailed Implementation

[0038] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0039] In the description of this application, it should be understood that the terms "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, and "at least one" can mean one, two, or more, unless otherwise explicitly specified. In the description of this application, "perpendicular" means completely perpendicular to 90° or almost completely perpendicular, for example, the range of included angles from 80° to 100° is considered perpendicular. Similarly, "parallel" means completely parallel or almost completely parallel, for example, the range of completely parallel angles from 10° is considered parallel.

[0040] It should also be noted that, in this embodiment of the application, the arrangement direction of the multiple battery cells 200 is set as the first direction X. The first direction X is set in order to facilitate the description of the overall structural positional relationship of the battery pack.

[0041] With the continuous development of new energy vehicles, power batteries, as the power source for these vehicles, are widely used. Currently, new energy vehicle power batteries are constantly pursuing fast charging efficiency. As fast charging time decreases and efficiency increases, the heating rate of individual battery cells (200) also increases. Furthermore, there may be instances where individual battery cells (200) experience higher temperature rises. In such cases, the heat from these cells can transfer to adjacent cells, potentially leading to thermal runaway risks within the battery pack and reducing its safety.

[0042] In view of this, embodiments of this application provide a battery pack designed to solve the above-mentioned problems.

[0043] Please refer to the following: Figure 1 , Figure 2 , Figure 5 , Figure 6 and Figure 7 This application provides a battery pack having a first direction X and including a housing 100, a plurality of battery cells 200, and a plurality of heat insulation components 300. The housing 100 has a receiving cavity 110. The plurality of battery cells 200 are arranged along the first direction X. Each battery cell 200 includes a first terminal 210 and a second terminal 220 arranged opposite to each other along the first direction X. Two adjacent battery cells 200 include a first battery 260 and a second battery 270. The first terminal 210 of the first battery 260 is connected to the second terminal 220 of the second battery 270. A heat insulation component 300 is provided between two adjacent battery cells 200. The heat insulation component 300 has a clearance space 310 that extends through the heat insulation component 300 along the first direction X. At least a portion of the connected first terminal 210 and at least a portion of the second terminal 220 pass through the clearance space 310.

[0044] In this embodiment, the first terminal 210 and the second terminal 220 of the battery cell 200 are disposed opposite to each other on both sides of the battery cell 200. At this time, the terminals of two adjacent battery cells 200 are connected to each other. This eliminates the need for structures such as busbars, ensuring the stability of the conductive connection of the battery cells 200, reducing the weight of the battery pack, and facilitating battery pack assembly. A heat insulation component 300 is provided between two adjacent battery cells 200, and the heat insulation component 300 is provided with a clearance space 310 to avoid the terminals of the battery cells 200. This facilitates the assembly of the heat insulation component 300 with the battery cells 200. At this time, the heat insulation component 300 can be spaced between adjacent battery cells 200. When a battery cell 200 experiences thermal runaway, it blocks the heat transmission of the thermally runaway battery cell 200, playing a role in heat isolation. At the same time, it can provide expansion gaps and buffers for the battery cells 200, preventing terminal deformation caused by vibration during the expansion of the battery cells 200 and affecting the conductive connection effect, thus dispersing the stress.

[0045] Specifically, such as Figure 3 , Figure 4 , Figure 6 and Figure 7 As shown, in this embodiment of the application, the battery cell 200 has a first terminal 210 and a second terminal 220 arranged opposite to each other along the first direction X. Thus, when multiple battery cells 200 are arranged along the first direction X, the first terminals 210 and second terminals 220 of two adjacent battery cells 200 can be directly connected and electrically conductively joined. This eliminates the need for a busbar for conductive connection between adjacent battery cells 200, effectively simplifying the internal structure of the battery pack and improving the ease of battery pack assembly. Furthermore, since there is a gap between the adjacent end faces of two adjacent battery cells 200 when their terminals are joined, a heat insulation member 300 is provided between the adjacent battery cells 200. The heat insulation member 300 is located within the gap between the end faces of the adjacent battery cells 200. This heat insulation member 300 can isolate the heat between the adjacent battery cells 200, preventing the transfer of high heat from one battery cell 200 to adjacent battery cells 200 in the event of thermal runaway, thereby reducing the possibility of thermal runaway propagation and improving the safety of the battery pack.

[0046] It should be noted that by providing a clearance space 310 in the heat insulation component 300, at least a portion of the first terminal 210 and at least a portion of the second terminal 220 are inserted into the clearance space 310. In this case, after the terminals of two adjacent battery cells 200 are fixedly connected, the heat insulation component 300 is connected to the battery cell 200 as a whole, preventing the heat insulation component 300 from falling between adjacent battery cells 200 after the battery cells 200 are assembled, thereby ensuring the stability of the structure after the battery cells 200 are assembled.

[0047] Furthermore, it should be noted that the first terminal 210 and the second terminal 220 of two adjacent battery cells 200 preferably protrude from the outer side of the end plate of the battery cell 200. When the adjacent first terminal 210 and second terminal 220 are mated, a gap exists between the adjacent end plates of the two battery cells 200, providing accommodating space for the heat insulation component 300. Preferably, the heat insulation component 300 is connected to each of the two adjacent battery cells 200, thus ensuring structural stability.

[0048] Furthermore, the heat insulation component 300 is an elastic component, and it is sandwiched between two adjacent battery cells 200. In this case, the heat insulation component 300 can be pressurized and deformed during the thermal expansion of the battery cell 200 to provide an expansion gap, enabling the normal expansion of the battery cell 200. It also has a certain buffering effect, effectively dispersing the force and preventing the first terminal 210 and the second terminal 220 from deforming under vibration or other conditions, thereby maintaining the conductive connection between the two adjacent battery cells 200.

[0049] Furthermore, the heat insulation component 300 is also an insulating component, which ensures the insulation performance between adjacent battery cells 200.

[0050] Furthermore, the heat insulation component 300 can be any one of aerogel board, nanoboard, or ceramic fiber board. The heat insulation component 300 made of the above materials can not only have a good heat insulation effect, but also be lightweight, which is conducive to the overall weight reduction of the battery pack. It also has a certain deformation energy absorption capacity, which can provide buffer energy absorption and allow the battery cells 200 to expand normally under thermal conditions.

[0051] In some embodiments, a portion of the second terminal 220 is disposed around the outside of the first terminal 210, and the inner diameter of the clearance space 310 is greater than or equal to the outer diameter of the second terminal 220.

[0052] In this embodiment, by partially surrounding the first terminal 210, the second terminal 220 forms a accommodating space, within which a portion of the first terminal 210 is inserted. This allows the second terminal 220 to position and limit the first terminal 210, preventing relative displacement between them along a direction perpendicular to the first direction X, thus maintaining the structural stability of the assembled battery cells 200. The inner diameter of the clearance space 310 is greater than or equal to the outer diameter of the second terminal 220. This allows the second terminal 220 to first pass through the clearance space 310 before docking with the first terminal 210, enabling effective assembly of the battery cell 200 and the heat insulation component 300.

[0053] Please refer to the following: Figure 3 , Figure 5 and Figure 7 In some embodiments, the battery cell 200 includes a first side 230 and a second side 240, a first terminal 210 is disposed on the first side 230, the second side 240 is disposed opposite to the first side 230 along a first direction X, and a second terminal 220 is disposed on the second side 240; the heat insulation member 300 includes a third side 320 and a fourth side 330, the third side 320 is attached to the first side 230 of the first battery 260, the fourth side 330 is disposed opposite to the third side 320 along the first direction X, and the fourth side 330 is attached to the second side 240 of the second battery 270.

[0054] In this embodiment, by setting the third side 320 of the heat insulation component 300 to be attached to the first side 230 of the first battery 260, and the fourth side 330 of the heat insulation component 300 to be attached to the second side 240 of the second battery 270, it is possible to achieve complete attachment between the two adjacent battery cells 200 and both sides of the heat insulation component 300. This facilitates effective heat insulation, provides more uniform force distribution, and improves stability and safety.

[0055] Please refer to the following: Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7 In some embodiments, the battery cell 200 has a first groove 250 that extends through a first side 230 and a second side 240 of the battery cell 200 along a first direction X; the heat insulation member 300 has a second groove 340 that extends through a third side 320 and a fourth side 330 along a first direction X; along the first direction X, the orthographic projection of the third side 320 on the first battery 260 is located on the first side 230, and the orthographic projection of the fourth side 330 on the second battery 270 is located on the second side 240.

[0056] In this embodiment, the first groove 250 of the battery cell 200 corresponds to the second groove 340 of the heat insulation member 300. Since the orthographic projection of the third side surface 320 on the first battery 260 is located on the first side surface 230 along the first direction X, and the orthographic projection of the fourth side surface 330 on the second battery 270 is located on the second side surface 240, it can be understood that the inner diameter of the second groove 340 is greater than or equal to the inner diameter of the first groove 250, thus preventing the heat insulation member 300 from obstructing the first groove 250. The second groove 340 and the first groove 250 provide accommodating space for the thermal management component. The thermal management component can then pass through the first groove 250 and the second groove 340, exchanging heat with the inner wall of the first groove 250, thereby effectively heat-exchanging the battery cell 200 and improving the thermal management efficiency of the battery pack.

[0057] In some embodiments, the third side 320 is adhesively bonded to the first side 230, and the fourth side 330 is adhesively bonded to the second side 240.

[0058] In this embodiment, by bonding the third side 320 to the first side 230 and the fourth side 330 to the second side 240, it can be understood that the heat insulation component 300 is bonded to the two adjacent battery cells 200, which facilitates the effective assembly and fixation between the heat insulation component 300 and the battery cells 200, and avoids relative displacement or skewing of the heat insulation component 300 during the battery pack assembly process, thereby ensuring the contact area and heat insulation area between the heat insulation component 300 and the battery cells 200.

[0059] In some embodiments, the area of ​​the first side surface 230 is S1 mm. 2 The area of ​​the second side 240 is S2mm. 2 The area of ​​the third side 320 is S3 mm. 2 The area of ​​the fourth side 330 is S4 mm. 2 The following conditions must be met: 70% ≤ S3 / S1 ≤ 100%, 70% ≤ S4 / S2 ≤ 100%.

[0060] In this embodiment, the area ratio of the third side 320 to the area of ​​the first side 230 is set between 70% and 100%, and the area ratio of the fourth side 330 to the second side 240 is set between 70% and 100%. This ensures that there is sufficient contact area between the heat insulation component 300 and the battery cell 200, thereby achieving a better heat insulation effect and a better buffering and energy absorption effect.

[0061] Specifically, the value of S3 / S1 can be any value from 70%, 71%, 72%, 73%, 74%, 75%, 76%, 77%, 78%, 79%, 80%, 81%, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, 100% or a range between any two numbers. The value of S4 / S2 can be any value from 70%, 71%, 72%, 73%, 74%, 75%, 76%, 77%, 78%, 79%, 80%, 81%, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, 100%, or a range between any two numbers. A higher value corresponds to a larger contact area and better heat insulation and cushioning effects. When S3 / S1 < 70% and S4 / S2 < 70%, and these ratios decrease, the exposed portions of the first battery 260 and the second battery 270 become larger. Consequently, the uninsulated area between the first battery 260 and the second battery 270 becomes larger. On the one hand, the insulation effect is reduced, and the possibility of thermal runaway of a certain battery cell 200 being transmitted to an adjacent battery cell 200 increases. At the same time, the buffering and energy absorption effect of the heat insulation component 300 will decrease accordingly, and its ability to disperse stress will also decrease.

[0062] In some embodiments, the third side 320 has the same shape as the first side 230, and the fourth side 330 has the same shape as the second side 240.

[0063] In this embodiment of the application, by setting the first side 230 and the third side 320 to have the same shape, and the second side 240 and the fourth side 330 to have the same shape, it is easier to achieve complete fit between the first side 230 and the third side 320, and between the second side 240 and the fourth side 330, thereby achieving better heat insulation and cushioning effects.

[0064] This application also provides an electrical device, including a battery pack as described in any of the foregoing embodiments.

[0065] It is understood that the electrical device of this application includes all the technical features and effects of the aforementioned battery pack, which will not be repeated here.

[0066] Of course, the electrical devices referred to in this application can be vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools, etc. Vehicles can be new energy vehicles, including pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles; spacecraft include airplanes, rockets, space shuttles, and spacecraft; electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys; power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers. This application does not impose any special limitations on the above-mentioned electrical devices.

[0067] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0068] The battery pack and power device provided in the embodiments of this application have been described in detail above, and specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the technical solutions and core ideas of this application. Those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A battery pack, characterized in that, Having a first direction, including: The box-shaped enclosure has a receiving cavity; Multiple battery cells are arranged along the first direction. Each battery cell includes a first terminal and a second terminal that are disposed opposite to each other along the first direction. Two adjacent battery cells include a first battery and a second battery. The first terminal of the first battery is connected to the second terminal of the second battery. Multiple heat insulation components are provided, with one heat insulation component disposed between two adjacent battery cells. The heat insulation component has a clearance space that extends through the heat insulation component along the first direction. At least a portion of the first terminal and at least a portion of the second terminal are connected and pass through the clearance space.

2. The battery pack according to claim 1, characterized in that, The second terminal is partially arranged around the outside of the first terminal, and the inner diameter of the clearance space is greater than or equal to the outer diameter of the second terminal.

3. The battery pack according to claim 1, characterized in that, The battery cell includes: The first side, wherein the first terminal is disposed on the first side; The second side is disposed opposite to the first side along the first direction, and the second terminal is disposed on the second side. The heat insulation component includes: The third side is attached to the first side of the first battery; The fourth side is disposed opposite to the third side along the first direction, and the fourth side is attached to the second side of the second battery.

4. The battery pack according to claim 3, characterized in that, The battery cell has a first groove, which extends through the first side and the second side of the battery cell along the first direction. The heat insulation component has a second groove that extends through the third side and the fourth side along the first direction; Along the first direction, the orthographic projection of the third side onto the first battery is located on the first side, and the orthographic projection of the fourth side onto the second battery is located on the second side.

5. The battery pack according to claim 3, characterized in that, The third side is bonded to the first side, and the fourth side is bonded to the second side.

6. The battery pack according to claim 3, characterized in that, The area of ​​the first side is S1mm. 2 The area of ​​the second side is S2 mm. 2 The area of ​​the third side is S3 mm. 2 The area of ​​the fourth side is S4 mm. 2 The following conditions must be met: 70% ≤ S3 / S1 ≤ 100%, 70% ≤ S4 / S2 ≤ 100%.

7. The battery pack according to claim 6, characterized in that, The third side has the same shape as the first side, and the fourth side has the same shape as the second side.

8. The battery pack according to claim 1, characterized in that, The heat insulation component is any one of aerogel board, nanoboard, or ceramic fiber board.

9. The battery pack according to claim 1, characterized in that, The heat insulation component is an elastic component, and it is sandwiched between two adjacent battery cells.

10. An electrical device, characterized in that, Includes the battery pack as described in any one of claims 1-9.

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