Battery pack

Abstract

The utility model provides a battery pack which comprises a shell, a battery cell cavity used for containing a battery cell is defined by the shell, the shell is provided with an exhaust channel, the exhaust channel extends and is provided with a first end and a second end far away from the first end, the first end is communicated with the battery cell cavity, and the second end is located outside the battery cell cavity. The exhaust passage is arranged on the shell, the first end of the exhaust passage is communicated with the battery cell cavity, the second end of the exhaust passage is positioned outside the battery cell cavity, and extruded air in the battery cell cavity can be fully exhausted into the exhaust passage and is exhausted out of the battery cell cavity from the second end, so that polystyrene foam can be smoothly foamed to effectively limit the battery cell; and the safety performance of the battery pack is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, and more particularly to a battery pack. BACKGROUND

[0002] For a conventional battery pack, foaming glue is often used to fill between multiple battery cells, so as to position the multiple battery cells and meet the lightweight requirement of the battery pack. However, when the foaming glue foams, air cavities are generated, which causes the foaming glue to be insufficiently filled, so that some battery cells cannot be effectively positioned. When the battery cells trigger thermal runaway, the battery cells are prone to be tilted, and the thermal runaway spatter of the battery cells is sprayed to the surrounding or the adjacent two battery cells to cause short circuit, which further causes thermal spread of the entire battery pack, thereby causing safety risk of the battery pack. CONTENT OF THE UTILITY MODEL

[0003] The purpose of the embodiments of the present application is to provide a battery pack with good safety performance.

[0004] The embodiments of the present application provide a battery pack, which comprises a shell, the shell surrounds a battery cell cavity for accommodating battery cells, the shell is provided with an exhaust passage, the exhaust passage extends and has a first end and a second end away from the first end, the first end is in communication with the battery cell cavity, and the second end is located outside the battery cell cavity.

[0005] In one of the embodiments, the battery pack comprises a battery cell group, the battery cell group comprises a plurality of battery cells arranged in an array, the battery cell group is divided into a peripheral region at the array edge and a middle region surrounded by the peripheral region; and the first end corresponds to the middle region.

[0006] In one of the embodiments, on the extension path of the exhaust passage, the exhaust passage is in communication with the battery cell cavity at a plurality of positions corresponding to the middle region and / or the peripheral region.

[0007] In one of the embodiments, there are a plurality of exhaust passages, and the plurality of exhaust passages are located on the same side of the plurality of battery cells.

[0008] In one of the embodiments, the first ends of the plurality of exhaust passages are in communication with each other.

[0009] In one of the embodiments, there are two exhaust passages, and the two exhaust passages jointly form a "U" shape.

[0010] In one of the embodiments, the shell is provided with an electrical cavity, the second end extends into the electrical cavity and is in communication with the electrical cavity.

[0011] In one of the embodiments, the battery pack comprises a vent valve arranged on the shell, which can communicate the electrical cavity with an external space around the shell.

[0012] In one of the embodiments, the battery pack comprises a foamed colloid filled in the cell cavity.

[0013] In one of the embodiments, the shell comprises a box body and a cover arranged on the box body, the box body has a first accommodating groove and a second accommodating groove arranged at intervals, the cover and the part of the box body surrounding the first accommodating groove jointly form the cell cavity, and the cover and the part of the box body surrounding the second accommodating groove jointly form the electrical cavity; the exhaust passage is arranged on the cover.

[0014] In one of the embodiments, the cover comprises a cover plate body and an exhaust cover plate, the exhaust cover plate is fixed on the side of the cover plate body facing the cell cavity, and at least part of the structure of the cover plate body jointly forms the exhaust passage.

[0015] In one of the embodiments, the exhaust cover plate is provided with an exhaust hole, and the exhaust passage communicates with the cell cavity through the exhaust hole.

[0016] The battery pack provided by the embodiments has the following beneficial effects: compared with the related art, by arranging the exhaust passage on the shell, and making the first end of the exhaust passage communicate with the cell cavity and the second end of the exhaust passage be located outside the cell cavity, the air in the cell cavity pressed by the foamed colloid during the continuous foaming process of the foamed colloid can enter the exhaust passage, and be gradually guided from the first end to the second end and discharged outside the cell cavity, so that the foamed colloid can be smoothly foamed to effectively limit the cells, thereby improving the safety performance of the battery pack. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or prior art description will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0018] Figure 1 The appearance structure diagram of the battery pack provided by the embodiments of the present application is shown in the figure.

[0019] Figure 2 The internal structure perspective view of the battery pack shown in the figure is shown in the figure. Figure 1

[0020] The internal structure perspective view of the battery pack shown in the figure is shown in the figure. Figure 3 Figure 1 ​The diagram shows an exploded view of the battery pack structure, in which four local areas of the foamed colloid are hidden;

[0021] Figure 4 for Figure 3 A structural schematic diagram of the cover of the battery pack shown from another perspective;

[0022] Figure 5 for Figure 4 A cross-sectional view of the cover from one perspective and an enlarged schematic diagram of its partial structure.

[0023] The following are the labeling elements in the figure:

[0024] 10. Battery pack; 200. Cell assembly; 210. Cell; 220. Peripheral area; 230. Middle area; 300. Outer casing; 310. Cell cavity; 320. Exhaust channel; 321. First end; 322. Second end; 330. Exhaust port; 340. Electrical cavity; 350. Housing; 351. First receiving groove; 352. Second receiving groove; 360. Cover; 361. Cover plate body; 361a. Groove; 362. Exhaust cover plate; 400. Electrical component; 500. Vent valve; 600. Foamed gel. Detailed Implementation

[0025] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0026] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0027] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They 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. Therefore, they should not be construed as limitations on this application.

[0028] 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 technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0029] Please refer to the following: Figures 1 to 5 The battery pack 10 provided in the embodiments of this application will now be described.

[0030] The battery pack 10 includes a housing 300, which encloses a cell cavity 310 for accommodating the cell 210. The housing 300 is provided with an exhaust channel 320, which extends and has a first end 321 and a second end 322 away from the first end 321. The first end 321 is in communication with the cell cavity 310, and the second end 322 is located outside the cell cavity 310.

[0031] In this application, the battery pack 10 also includes a cell group 200, which includes a plurality of cells 210 arranged in an array, and the plurality of cells 210 of the cell group 200 are all housed in a cell cavity 310.

[0032] Research has shown that when multiple battery cells 210 are placed inside a battery cell cavity 310 and the cavity 310 is filled with expanding foam, the two or more liquid compounds within the expanding foam react with each other, causing rapid heating and expansion, typically reaching a maximum temperature of 80°C. As the temperature of the expanding foam gradually increases, its expansion rate also gradually accelerates. During the continuous foaming and expansion process, the battery cells 210 rapidly absorb the heat energy from the expanding foam, resulting in a slow temperature rise and foaming speed. However, the expanding foam at the edge of the battery cell 210 array absorbs less heat, resulting in a faster temperature rise and foaming speed. Thus, the foaming speed gradually decreases from the edge of the battery cell 210 array towards the center. The expanding foam at the edge of the battery cell 210 array first rapidly foams and compresses the inner wall of the outer shell 300, forming a ring-shaped expanding foam 600 surrounding the battery cell 210 array. This causes air to be trapped in the battery cell 210 array area, forming an initial air cavity. As the foam in the cell 210 array area continues to expand, the air in the initial foamed air cavity is continuously compressed. As the compound reaction ends and the heat dissipates, the expansion of the foam also gradually declines and ends, eventually becoming unable to compress the air. An incompressible air cavity is formed within a certain range at the center of the cell 210 array.

[0033] In the battery pack 10 of this application, by providing an exhaust channel 320 on the outer casing 300, and having the first end 321 of the exhaust channel 320 connected to the cell cavity 310, while the second end 322 is located outside the cell cavity 310, the compressed air inside the cell cavity 310 can enter the exhaust channel 320 during the continuous foaming of the foaming adhesive, and be gradually guided from the first end 321 to the second end 322 and discharged outside the cell cavity 310. In this way, the foaming adhesive can be successfully foamed to effectively limit the position of each cell 210, thereby improving the safety performance of the battery pack 10.

[0034] Specifically, in this application, the cell assembly 200 is divided into a peripheral region 220 located at the edge of the array (i.e., Figure 2 The area outside the dashed box) and the middle area 230 surrounded by the outer area 220 (i.e. Figure 2 The area within the dashed box), with the first end 321 corresponding to the middle area 230. It can be understood that since the first end 321 corresponds to the middle area 230 of the cell 210 array, it ensures that compressed air is fully discharged into the exhaust channel 320, allowing the foam to foam smoothly and ultimately eliminating the incompressible air cavity. This ensures that each cell 210 is effectively limited, thereby improving the safety performance of the battery pack 10.

[0035] It should be noted that the middle region 230 of the cell 210 array can be understood as the region corresponding to the incompressible air cavity. The region of the incompressible air cavity can be determined experimentally. Therefore, the division between the outer region 220 and the middle region 230 is not clearly defined and can be changed according to the size of the cell 210 array area and the shape of the array.

[0036] Combination Figures 2 to 4 As shown in this application, along the extension path of the exhaust channel 320, the exhaust channel 320 communicates with the cell cavity 310 at multiple locations corresponding to the intermediate region 230 and / or the peripheral region 220. By enabling the exhaust channel 320 to communicate with the cell cavity 310 at multiple locations, air inside the cell cavity 310 can enter the exhaust channel 320 more smoothly and be discharged, thus avoiding obstruction of the foaming of the expanding foam due to poor air discharge. An exhaust hole 330 can be provided on the outer casing 300, thereby enabling the exhaust channel 320 and the cell cavity 310 to communicate through the exhaust hole 330.

[0037] In one embodiment, the exhaust channel 320 may have exhaust holes 330 communicating with the cell cavity 310 at multiple locations on a portion corresponding to the intermediate region 230. This allows air within the cell cavity 310 to enter the exhaust channel 320 and be discharged through the multiple exhaust holes 330 corresponding to the intermediate region 230. For example, multiple exhaust holes 330 may be provided at the first end 321, thus communicating with the cell cavity 310 at multiple locations on the first end 321. Alternatively, exhaust holes 330 may be provided at both the first end 321 and multiple locations gradually moving away from the first end 321, so that all multiple exhaust holes 330 correspond to the intermediate region 230 and communicate with the cell cavity 310.

[0038] In another embodiment, based on the fact that the first end 321 of the exhaust channel 320 is connected to the cell cavity 310, the exhaust channel 320 can also have exhaust holes 330 connected to the cell cavity 310 at multiple locations corresponding to the peripheral region 220, so that the air in the cell cavity 310 can also enter the exhaust channel 320 and be discharged through the multiple exhaust holes 330 corresponding to the peripheral region 220.

[0039] Specifically, in the embodiments of this application, exhaust holes 330 are provided at multiple locations along the path of the exhaust channel 320 extending from the first end 321 to the second end 322. Among them, multiple exhaust holes 330 correspond to the middle region 230, and multiple exhaust holes 330 correspond to the outer region 220. In this way, as the foam gradually foams from the outer region 220 to the center region, the air in the cell cavity 310 can smoothly enter the exhaust channel 320 and be discharged through a large number of exhaust holes 330.

[0040] In this application, there are multiple exhaust channels 320, which are located on the same side of multiple battery cells 210. By providing multiple exhaust channels 320 on the same side of multiple battery cells 210, the multiple exhaust channels 320 can cover a larger area, thereby improving the smoothness of air discharge and preventing air from being compressed and hindering the smooth foaming of the foaming adhesive.

[0041] Furthermore, the first ends 321 of the multiple exhaust channels 320 are interconnected. This arrangement allows air to be smoothly introduced into other exhaust channels 320 and discharged when air discharge is not smooth in any exhaust channel 320.

[0042] In a specific embodiment of this application, there are two exhaust channels 320, which together form a "U" shape. It can be understood that the "U" shape arrangement of the two exhaust channels 320 not only allows for smooth air exhaust but also ensures that the second ends 322 of the two exhaust channels 320 are located on the same side of the cell cavity 310, facilitating the simultaneous processing of air exhausted from both second ends 322. In other embodiments, three exhaust channels 320 may be provided, with the first ends 321 of the three exhaust channels 320 connected and together forming an "E" shape.

[0043] Combination Figure 2 and Figure 3 As shown, specifically in this application, the outer casing 300 is provided with an electrical cavity 340, and the second end 322 extends into and communicates with the electrical cavity 340. It can be understood that the electrical cavity 340 is used to accommodate the electrical component 400. After the electrical component 400 is placed inside the electrical cavity 340, it can achieve electrical connection with the battery cell 210 inside the battery cell cavity 310. Air discharged from the second end 322 of the exhaust channel 320 can enter the electrical cavity 340. Thus, in addition to achieving the purpose of venting air from the battery cell cavity 310 through the second end 322, the outer casing 300 surrounding the electrical cavity 340 can also enclose the second end 322, providing protection for it. This overcomes the problem that water, mist, etc., from the external environment may enter the battery cell cavity 310 along the exhaust channel 320 and damage the battery cell 210 when the second end 322 is exposed on the outer surface of the outer casing 300 for air discharge.

[0044] like Figures 1 to 3 As shown, the battery pack 10 further includes a vent valve 500 disposed on the housing 300, which connects the electrical cavity 340 to the external space surrounding the housing 300. It is understood that air discharged from the second end 322 into the electrical cavity 340 can be further discharged to the external environment through the vent valve 500. Normally, the vent valve 500 is closed; when the air pressure inside the electrical cavity 340 reaches a certain level, it will force the vent valve 500 to open, thereby releasing pressure.

[0045] In this application, the foaming adhesive inside the cell cavity 310 eventually forms a foamed adhesive 600 after foaming, which fills the cell cavity 310. It can be understood that after foaming, the foamed adhesive 600 fills the gaps between the multiple cells 210, thereby fixing the multiple cells 210. Due to the arrangement of the venting channel 320, air inside the cell cavity 310 can be fully expelled, which helps the foaming adhesive to fully foam, ultimately allowing the foamed adhesive to fully fill the cell cavity. Furthermore, on the side of the cell 210 array facing the venting channel 320, the foamed adhesive 600 protrudes above the cell 210 array to fully cover the surface of the cell 210 array, and the foamed adhesive 600 adheres tightly to the outer casing 300, maintaining a firm bond with the outer casing 300.

[0046] Combination Figures 1 to 3 As shown, specifically in this application, the outer casing 300 includes a housing 350 and a cover 360 covering the housing 350. The housing 350 has a first receiving groove 351 and a second receiving groove 352 spaced apart. The cover 360 and the portion of the housing 350 surrounding the first receiving groove 351 together form a cell cavity 310, and the cover 360 and the portion of the housing 350 surrounding the second receiving groove 352 together form an electrical cavity 340. An exhaust channel 320 is provided on the cover 360. It can be understood that multiple cells 210 are initially arranged in an array in the first receiving groove 351, and electrical components 400 are installed in the second receiving groove 352. After the cover 360 and the housing 350 are properly connected, the cover 360 covers the first receiving groove 351 to obtain the cell cavity 310, and the cover 360 covers the second receiving groove 352 to obtain the electrical cavity 340, and the electrical cavity 340 is separated from the cell cavity 310.

[0047] It is understood that in this application, all of the multiple battery cells 210 are located inside the housing 350, thus the exhaust channel 320 is disposed on the cover 360. In other embodiments, both the housing 350 and the cover 360 may have groove structures formed, so that a portion of the battery cell 210 is accommodated in the groove structure on the housing 350, and another portion of the battery cell 210 is accommodated in the groove structure on the cover 360. In this case, the exhaust channel 320 may be disposed on the cover 360 or on the housing 350.

[0048] Combination Figures 3 to 5As shown, specifically in this application, the cover 360 includes a cover body 361 and an exhaust cover 362. The exhaust cover 362 is fixed to the cover body 361 on the side facing the cell cavity 310, and together with at least a portion of the structure of the cover body 361, it forms an exhaust channel 320. It can be understood that the cover body 361 is connected to the housing 350 to form the cell cavity 310 and the electrical cavity 340, while the exhaust cover 362 is connected to the cover body 361 and together with the cover body 361 forms the exhaust channel 320. In other embodiments, the cover body 361 and the exhaust cover 362 can also be an integral structure, so that the cover 360, as a single unit, has an exhaust channel 320 inside.

[0049] In this application, the exhaust cover plate 362 has an exhaust hole 330, and the exhaust channel 320 communicates with the cell cavity 310 through the exhaust hole 330. The exhaust cover plate 362 is a flat plate structure with an exhaust hole 330, and the cover plate body 361 is recessed on the side away from the cell 210 at the position corresponding to the extension path of the exhaust channel 320. Thus, after the exhaust cover plate 362 covers the groove 361a and is connected to the cover plate body 361, the two form the aforementioned exhaust channel 320, and the air in the cell cavity 310 can enter the exhaust channel 320 through the exhaust hole 330 on the exhaust cover plate 362.

[0050] It is understood that the exhaust cover 362 can be a flat structural component such as a PC board, PP board, aluminum sheet, or steel sheet. After the exhaust cover 362 covers the groove 361a, its two edges protruding from both sides of the groove 361a are connected to the cover body 361, and the exhaust cover 362 can be glued or welded to the cover body 361. Furthermore, the edges of the exhaust cover 362 can be tightly attached to the cover body 361 without any gap between them. In this case, the air in the cell cavity 310 can only enter the exhaust channel 320 through the exhaust hole 330. In other embodiments, the edges of the exhaust cover 362 can be connected to the cover body 361 at multiple intervals, thereby forming a ventilation gap between the edges of the exhaust cover 362 and the cover body 361. In this case, the air in the cell cavity 310 can enter the exhaust channel 320 through the exhaust hole 330 and the ventilation gap.

[0051] In the battery pack 10 of this application, since the outer casing 300 is provided with an exhaust channel 320 that communicates with the cell cavity 310, during the continuous foaming of the foam in the cell cavity 310, the air in the cell cavity 310 can be discharged to the outside of the cell cavity 310 under the pressure of the foam. Thus, the foam can be successfully foamed and finally fully fill the originally incompressible air cavity, and each cell 210 can be effectively limited, thereby improving the safety performance of the battery pack 10.

[0052] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A battery pack, characterized in that, The device includes a housing that encloses a cell cavity for accommodating a battery cell. The housing has an exhaust channel that extends and has a first end and a second end away from the first end. The first end communicates with the cell cavity, and the second end is located outside the cell cavity.

2. The battery pack according to claim 1, characterized in that, The battery pack includes a cell assembly, which includes a plurality of cells arranged in an array. The cell assembly is divided into an outer region at the edge of the array and an inner region surrounded by the outer region; the first end corresponds to the inner region.

3. The battery pack according to claim 2, characterized in that, Along the extension path of the exhaust channel, the exhaust channel is connected to the cell cavity at multiple locations corresponding to the intermediate region and / or the peripheral region.

4. The battery pack according to claim 1, characterized in that, There are multiple exhaust channels, and the multiple exhaust channels are located on the same side of the multiple battery cells.

5. The battery pack according to claim 4, characterized in that, The first ends of the plurality of exhaust passages are interconnected.

6. The battery pack according to claim 5, characterized in that, There are two exhaust channels, which together form a "U" shape.

7. The battery pack according to claim 1, characterized in that, The outer casing has an electrical cavity, and the second end extends into the electrical cavity and communicates with the electrical cavity.

8. The battery pack according to claim 7, characterized in that, The battery pack includes a vent valve on the housing, which enables communication between the electrical cavity and the external space surrounding the housing.

9. The battery pack according to claim 7, characterized in that, The outer casing includes a housing and a cover covering the housing. The housing has a first receiving groove and a second receiving groove spaced apart. The cover and the portion of the housing that forms the first receiving groove together form the cell cavity, and the cover and the portion of the housing that forms the second receiving groove together form the electrical cavity. The exhaust channel is located on the cover.

10. The battery pack according to claim 9, characterized in that, The cover includes a cover body and an exhaust cover. The exhaust cover is fixed to the cover body on the side facing the cell cavity and together with at least a portion of the structure of the cover body, forms the exhaust channel.

11. The battery pack according to claim 10, characterized in that, The exhaust cover plate has an exhaust hole, and the exhaust channel is connected to the cell cavity through the exhaust hole.

12. The battery pack according to claim 1, characterized in that, The battery pack includes a foamed gel that fills the cell cavity.

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