Battery pack and electric device

Abstract

The utility model provides a battery pack and an electric device, and relates to the technical field of batteries. A containing cavity is defined by the box body, the supporting plate is connected with the inner side wall of the containing cavity so as to divide the containing cavity into a placement space and an exhaust space, the battery cell is arranged in the placement space and connected with the supporting plate, and the battery cell is provided with an anti-explosion valve; a pressure relief hole and a communicating hole are formed in the supporting plate, the pressure relief hole communicates with the exhaust space, the orthographic projection of the anti-explosion valve on the supporting plate in the first direction is located in the pressure relief hole, and the placement space communicates with the exhaust space through the communicating hole; the communicating holes and the battery cells are arranged at intervals. According to the battery pack, the problem that when the battery pack is subjected to thermal runaway, in the process that high-temperature gas flows to the anti-explosion valve in the box body, the high-temperature gas can influence other battery cells in the box body, so that thermal diffusion of the battery pack is caused can be solved.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery pack and an electrical device. Background Technology

[0002] With the development of battery technology, battery packs have been widely used, and more and more electrical devices are adopting battery packs as their power source. A battery pack generally consists of a housing and multiple battery cells housed within the housing. The housing is equipped with explosion-proof valves. In the event of thermal runaway in a battery cell, the high-temperature gas ejected from the cell's explosion-proof valve will be discharged through the explosion-proof valve on the housing. However, during the flow of the high-temperature gas inside the housing to the explosion-proof valve, the high-temperature gas can affect other battery cells within the housing, causing thermal diffusion within the battery pack. Utility Model Content

[0003] In view of this, this application provides a battery pack and electrical equipment to solve the problem that when thermal runaway occurs in a battery pack, the high-temperature gas flowing inside the enclosure to the explosion-proof valve will affect other cells inside the enclosure, causing thermal diffusion of the battery pack.

[0004] According to one aspect of this application, a battery pack is provided, the battery pack having a first direction, a second direction and a third direction intersecting each other, the battery pack including a housing, a support plate and battery cells, the housing having a receiving cavity, the support plate being connected to the inner sidewall of the receiving cavity to divide the receiving cavity into a placement space and a venting space, the plane of the support plate intersecting the first direction, the battery cells being disposed in the placement space and connected to the support plate, and the battery cells having an explosion-proof valve;

[0005] The support plate has a pressure relief hole and a connecting hole. The pressure relief hole is connected to the exhaust space. The orthographic projection of the explosion-proof valve on the support plate along the first direction is located in the pressure relief hole. The mounting space and the exhaust space are connected through the connecting hole. The connecting hole is spaced apart from the orthographic projection of the battery cell on the plane where the support plate is located along the first direction.

[0006] According to another aspect of this application, an electrical device is provided, the electrical device comprising the battery pack described above.

[0007] In the battery pack of this application, a pressure relief hole is provided on the support plate, which communicates with the exhaust space. The orthogonal projection of the first pressure relief valve on the support plate is located within the pressure relief hole, thus exposing the explosion-proof valve of the battery cell through the pressure relief hole. In the event of thermal runaway of the battery cell, high-temperature gas is ejected from the explosion-proof valve, then enters the exhaust space through the pressure relief hole, and is discharged through the first pressure relief valve. The high-temperature gas generated by the thermal runaway of the battery cell will not enter the mounting space and will not affect other battery cells within the mounting space, avoiding the problem of thermal diffusion in the battery pack. Simultaneously, a connecting hole is also provided on the support plate. This connecting hole is not blocked by the battery cells, and the mounting space and exhaust space are connected through the connecting hole. High-temperature gas in the mounting space can also enter the exhaust space through the connecting hole, further improving the safety of the battery pack. Attached Figure Description

[0008] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0009] Figure 1 An exploded view of the battery pack of Embodiment 1 is shown;

[0010] Figure 2 A plan view showing a portion of the battery pack structure of Embodiment 1;

[0011] Figure 3 Show Figure 2 A cross-sectional view of the battery pack obtained by cutting along A-A';

[0012] Figure 4 Show Figure 3 Enlarged view of section C;

[0013] Figure 5 Show Figure 3 An enlarged view of part D in the image;

[0014] Figure 6 Show Figure 2 A cross-sectional view of the battery pack obtained by cutting along B-B';

[0015] Figure 7 Show Figure 6 An enlarged view of part E in the image;

[0016] Figure 8 A diagram showing the relative positions of the housing and support plate in the battery pack of Embodiment 1 is provided.

[0017] Figure 9A schematic diagram of the structure of the enclosure in the battery pack of Embodiment 1 is shown;

[0018] Figure 10 Show Figure 9 Enlarged view of section F in the middle;

[0019] Figure 11 A plan view showing a portion of the battery pack structure of Embodiment 2 is shown;

[0020] Figure 12 Show Figure 11 Cross-sectional view of the inner enclosure and housing obtained by cutting along G-G';

[0021] Figure 13 The diagram shows the relative positions of two adjacent battery cells.

[0022] Icons: 11-Box body; 111-Frame; 112-Lid; 12-Base plate; 121-Mounting hole; 13-Support beam; 2-Support plate; 21-Pressure relief hole; 22-Connecting hole; 3-Battery cell; 31-Explosion-proof valve; 41-First pressure relief valve; 42-Second pressure relief valve; 5-Fire-fighting component; 61-Enclosure component; 611-Connecting channel; 62-Heat-conducting component; 63-Heat-insulating component; 71-BMS; 72-BDU; 81-First fixing component; 82-Second fixing component; 9-Accommodation cavity; 91-Placement space; 92-Exhaust space; S1-First bonding surface; S2-Second bonding surface; L1-First direction; L2-Second direction; L3-Third direction. Detailed Implementation

[0023] The following detailed embodiments are provided to help the reader gain a comprehensive understanding of the methods, apparatus, and / or systems described herein. However, various changes, modifications, and equivalents of the methods, apparatus, and / or systems described herein will be apparent after understanding the disclosure of this application. For example, the order of operations described herein is merely illustrative and is not limited to the order set forth herein; changes that will be apparent after understanding the disclosure of this application are possible, except for operations that must occur in a specific order. Furthermore, for clarity and brevity, descriptions of features known in the art may be omitted.

[0024] The features described herein may be implemented in different forms and should not be construed as being limited to the examples described herein. Rather, the examples described herein have been provided merely to illustrate some of the many feasible ways of implementing the methods, apparatus, and / or systems described herein that will be apparent upon understanding the disclosure of this application.

[0025] Throughout the specification, when an element (such as a layer, region, or substrate) is described as being "on" another element, "connected to" another element, "bonded to" another element, "on" another element, or "covering" another element, it may be directly "on" another element, "connected to" another element, "bonded to" another element, "on" another element, or "covering" another element, or there may be one or more other elements in between. In contrast, when an element is described as being "directly on" another element, "directly connected to" another element, "directly bonded to" another element, "directly on" another element, or "directly covering" another element, there may be no other elements in between.

[0026] As used herein, the term “and / or” includes any one of the relevant items listed and any combination of any two or more items.

[0027] Although terms such as “first,” “second,” and “third” may be used herein to describe individual components, assemblies, regions, layers, or parts, these components, assemblies, regions, layers, or parts are not limited by these terms. Rather, these terms are used only to distinguish one component, assembly, region, layer, or part from another. Therefore, without departing from the teachings of the examples described herein, the first component, assembly, region, layer, or part referred to as the second component, assembly, region, layer, or part may also be referred to as the second component, assembly, region, layer, or part.

[0028] For ease of description, spatial relation terms such as “above,” “upper,” “below,” and “lower” are used herein to describe the relationship between one element and another, as shown in the accompanying drawings. Such spatial relation terms are intended to include not only the orientation depicted in the drawings but also different orientations of the device during use or operation. For example, if the device in the drawings is flipped, an element described as being “above” or “upper” relative to another element will subsequently be “below” or “lower” relative to that other element. Therefore, the term “above” includes both “above” and “below” orientations depending on the spatial orientation of the device. The device may also be positioned in other ways (e.g., rotated 90 degrees or in other orientations), and the spatial relation terms used herein will be interpreted accordingly.

[0029] In this application, the term "parallel" includes not only absolute parallelism but also approximate parallelism as commonly understood in engineering. For example, "parallel" refers to the angle between two lines, a line and a surface, or a surface, where the angle is between -1° and 1°. Similarly, "perpendicular" also includes not only absolute perpendicularity but also approximate perpendicularity as commonly understood in engineering. For example, "perpendicular" refers to the angle between two lines, a line and a surface, or a surface, where the angle is between 89° and 91°. Equal distances or equal angles include not only absolute equality but also approximate equality as commonly understood in engineering, meaning there may be a certain degree of error, such as a tolerance range of -1% to 1%.

[0030] The terminology used herein is for the purpose of describing various examples only and is not intended to limit this disclosure. Unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. The terms “comprising,” “including,” and “having” enumerate the stated features, quantities, operations, components, elements, and / or combinations thereof, but do not exclude the presence or addition of one or more other features, quantities, operations, components, elements, and / or combinations thereof.

[0031] Variations in the shapes shown in the accompanying drawings may occur due to manufacturing techniques and / or tolerances. Therefore, the examples described herein are not limited to the specific shapes shown in the accompanying drawings, but include changes in shape that may occur during manufacturing.

[0032] The features of the examples described herein can be combined in various ways that will be apparent upon understanding the disclosure of this application. Furthermore, although the examples described herein have a wide variety of constructions, other constructions are possible, as will be apparent upon understanding the disclosure of this application.

[0033] The following will combine Figures 1 to 13 The battery pack of this application is described below. Figures 1 to 13 In the configuration, the first direction L1 intersects with the second direction L2, and the plane defined by the first direction L1 and the second direction L2 intersects with the third direction L3. Preferably, the first direction L1, the second direction L2, and the third direction L3 are all perpendicular to each other. The following description of the battery pack will be based on the example of the first direction L1, the second direction L2, and the third direction L3 being perpendicular to each other.

[0034] According to one aspect of this application, a battery pack is provided, such as... Figures 1 to 13As shown, the battery pack includes a housing 11, a base plate 12, a support plate 2, battery cells 3, and a first pressure relief valve 41. The base plate 12 is connected to the housing 11. The housing 11 has a receiving cavity 9. The support plate 2 is connected to the inner wall of the receiving cavity 9 to divide the receiving cavity 9 into a placement space 91 and an exhaust space 92. The support plate 2 is perpendicular to the first direction L1. The placement space 91 and the exhaust space 92 are located on both sides of the support plate 2 in the first direction L1, respectively. The battery cell 3 is installed in the mounting space 91 and connected to the support plate 2. The battery cell 3 has an explosion-proof valve 31. The support plate 2 has a pressure relief hole 21 and a connecting hole 22. The pressure relief hole 21 is connected to the exhaust space 92. The orthogonal projection of the explosion-proof valve 31 along the first direction L1 on the support plate 2 is located in the pressure relief hole 21. The mounting space 91 and the exhaust space 92 are connected through the connecting hole 22. The connecting hole 22 and the orthogonal projection of the battery cell 3 along the first direction L1 on the plane of the support plate 2 are spaced apart. Since the orthogonal projection of the first pressure relief valve 41 on the support plate 2 is located in the pressure relief hole 21, the explosion-proof valve 31 of the battery cell 3 is exposed through the pressure relief hole 21. Thus, in the event of thermal runaway of the battery cell 3, high-temperature gas is ejected from the explosion-proof valve 31, then enters the exhaust space 92 through the pressure relief hole 21, and is discharged from the first pressure relief valve 41. The high-temperature gas generated by the thermal runaway of cell 3 will not enter the mounting space 91 and will not affect other cells 3 within the mounting space 91, thus avoiding the problem of thermal diffusion in the battery pack. Simultaneously, the support plate 2 also has a connecting hole 22, which is spaced apart from the cell 3. This ensures that the connecting hole 22 is not blocked by the cell 3, and the mounting space 91 and the exhaust space 92 can also be connected through the connecting hole 22. High-temperature gas within the mounting space 91 can also enter the exhaust space 92 through the connecting hole 22, further enhancing the safety of the battery pack.

[0035] Understandably, the battery pack may also have a corresponding pressure relief valve to discharge emissions from the exhaust space 92 into the battery pack.

[0036] In some embodiments, the base plate 12 is connected to the housing 11 and defines an exhaust space 92 with the housing 11 and the support plate 2. The base plate 12 has a mounting hole 121 that communicates with the exhaust space 92. A first pressure relief valve 41 is provided on the mounting hole 121 to discharge the emissions in the exhaust space 92 from the bottom of the battery pack, so as to prevent the emissions from affecting the electrical devices (such as vehicles) above the battery pack.

[0037] Optionally, the support plate 2 can be a liquid cooling plate, which allows the liquid cooling plate to cool the battery cell 3 while having the function of separating the installation space 91 and the exhaust space 92.

[0038] like Figure 1 and Figure 3As shown, the housing 11 includes a frame 111 and a cover 112. The housing 11 is rectangular and has two openings facing each other in a first direction L1. The bottom plate 12 can be bolted to the housing 11 to close one of the openings, and the cover 112 can also be bolted to the housing 11 to close the other opening. The bottom plate 12, frame 111, and cover 112 enclose a receiving cavity 9. The support plate 2 can be fixed to the inner wall of the frame 111 by welding or bolting to divide the receiving cavity 9 into a placement space 91 and an exhaust space 92.

[0039] Preferably, the distance e between the support plate 2 and the base plate 12 in the first direction L1 is 5mm-20mm. For example, the distance e between the support plate 2 and the base plate 12 in the first direction L1 can be 5mm, 6mm, 7mm, 8mm, 10mm, 12mm, or 15mm, etc. By setting the distance e between the support plate 2 and the base plate 12 in the first direction L1 within the above range, it can be ensured that the high-temperature gas can flow to the first pressure relief valve 41 through the exhaust space 92, while providing sufficient space for the installation of the first pressure relief valve 41 and the second pressure relief valve 42.

[0040] In addition, the battery pack also includes BMS71 (Battery Management System), BDU72 (Battery Energy Distribution Unit) and support beam 13. Specifically, support beam 13 can be part of the housing 11. The two ends of support beam 13 can be connected to frame 111 by welding, and the bottom of support beam 13 can be connected to support plate 2 by welding. BMS71 and BDU72 are mounted on support plate 2.

[0041] like Figure 2 , Figure 11 and Figure 13 As shown, the battery pack may include multiple battery cells 3, which can be divided into multiple groups. The battery cells 3 within each group are stacked along a third direction L3, and the multiple groups of battery cells 3 are spaced apart along a second direction L2. A heat insulation element 63 is provided between two adjacent battery cells 3 to prevent thermal runaway of one battery cell 3 from causing thermal runaway of other battery cells 3. Optionally, the heat insulation element 63 can be aerogel.

[0042] Furthermore, the battery pack also includes a heat-conducting component 62, which includes a first adhesive surface S1 and a second adhesive surface S2 that are opposite to each other in the first direction L1. The first adhesive surface S1 is bonded to the battery cell 3, and the second adhesive surface S2 is bonded to the support plate 2. In this way, the heat-conducting component 62 can fix the battery cell 3 to the support plate 2. At the same time, the heat-conducting component 62 has good thermal conductivity, which can transfer the heat generated by the battery cell 3 to the support plate 2, so as to better cool the battery cell 3.

[0043] Preferably, the dimension d of the heat-conducting component 62 in the first direction L1 is 1mm-2mm, that is, the distance between the first bonding surface S1 and the second bonding surface S2 in the first direction L1 is 1mm-2mm. For example, the dimension d of the heat-conducting component 62 in the first direction L1 can be 1mm, 1.2mm, 1.5mm, 1.7mm, 1.9mm, or 2mm, etc. By setting the dimension d of the heat-conducting component 62 in the first direction L1 within the above range, the stability of the fixation between the support plate 2 and the battery cell 3 can be ensured, while ensuring the heat conduction capability of the heat-conducting component 62 to the heat generated by the battery cell 3.

[0044] Optionally, the thermally conductive component 62 is a thermally conductive structural adhesive layer.

[0045] like Figure 7 and Figure 8 As shown, the support plate 2 has multiple pressure relief holes 21, and multiple battery cells 3 correspond one-to-one with the multiple pressure relief holes 21. The orthogonal projection of the battery cell 3 along the first direction L1 on the support plate 2 is located in the pressure relief hole 21 corresponding to the battery cell 3. When a battery cell 3 experiences thermal runaway, high-temperature and high-pressure gas is ejected from the explosion-proof valve 31, and then enters the exhaust space 92 through the pressure relief hole 21 corresponding to the battery cell 3, and is discharged from the first pressure relief valve 41.

[0046] Optionally, a pressure relief hole 21 can be provided for each group of battery cells 3. When a battery cell 3 in the group experiences thermal runaway, the high-temperature gas enters the exhaust space 92 through the pressure relief hole 21 corresponding to the battery cell 3 in the group and is then discharged from the first pressure relief valve 41.

[0047] like Figure 4 As shown, a first fixing member 81 is welded to the side of the base plate 12 facing the exhaust space 92. The first fixing member 81 is a hollow structure. A fixing hole is opened on the base plate 12 along the first direction L1, which is connected to the space inside the first fixing member 81. A part of the first pressure relief valve 41 passes through the fixing hole and the first fixing member 81 from the side of the base plate 12 away from the exhaust space 92, and is threadedly connected to the first fixing member 81, thereby fixing the first pressure relief valve 41.

[0048] Preferably, the first fastener 81 is a nut.

[0049] like Figure 2 and Figure 11 As shown, the battery pack also includes a second pressure relief valve 42, which is disposed on the connecting hole 22 to discharge high-temperature gas in the housing space 91 to the exhaust space 92. When the battery pack is compressed, the battery cell 3 may discharge high-temperature gas into the housing space 91. At this time, the high-temperature gas can flow to the second pressure relief valve 42, and then be discharged through the second pressure relief valve 42, the exhaust space 92, and the first pressure relief valve 41. In this way, the high-temperature gas in the housing space 91 is discharged, further improving the safety of the battery pack.

[0050] Furthermore, such as Figure 5 and Figure 8 As shown, a second fixing member 82 is welded to the side of the support plate 2 facing away from the exhaust space 92. The second fixing member 82 is a hollow structure. The connecting hole 22 is connected to the space inside the second fixing member 82. A part of the second pressure relief valve 42 passes through the connecting hole 22 and the second fixing member 82 from the side of the support plate 2 facing the exhaust space 92, and is threadedly connected to the second fixing member 82, thereby fixing the second pressure relief valve 42.

[0051] Preferably, the second fastener 82 is a nut.

[0052] like Figure 6 and Figure 12 As shown, the battery pack also includes a fire extinguishing device 5, which is cylindrical and fixed to the housing 11. The fire extinguishing device 5 is connected to the housing space 91. In the event of severe thermal runaway, fire extinguishing fluid or fire-fighting liquid can be injected into the housing space 91 through the fire extinguishing device 5 to prevent the battery cell 3 from burning.

[0053] Preferably, the distance a between the fire-fighting component 5 and the support plate 2 in the first direction L1 is greater than the dimension b of the battery cell 3 in the first direction L1. This can prevent the fire-fighting liquid from leaking as it is injected into the fire-fighting object through the fire-fighting component 5, so as to ensure that the battery cell 3 can be completely submerged in the injected fire-fighting liquid.

[0054] It should be noted that the battery cell 3 includes a housing, an electrode group, and a terminal post. The electrode group is located inside the housing, the explosion-proof valve 31 is located on the housing, the terminal post is connected to the electrode group, and part of the terminal post extends out of the housing. Here and the "dimension b of the battery cell 3 in the first direction L1" mentioned below only refers to the dimension of the housing in the first direction L1, and does not include the dimension of the terminal post of the battery cell 3 in the first direction L1.

[0055] In addition, the orthographic projection of the battery cell 3 along the first direction L1 on the support plate 2 and the orthographic projection of the fire-fighting component 5 along the first direction L1 on the support plate 2 are arranged at intervals, that is, the fire-fighting component 5 cannot be located directly above any battery cell 3. This ensures that the fire-fighting liquid injected through the fire-fighting component 5 will not directly rush towards the battery cell 3 directly opposite it, but will gradually submerge the battery cell 3, thereby ensuring the fire-fighting effect.

[0056] In some embodiments, the opening pressure of the first pressure relief valve 41 is greater than the opening pressure of the second pressure relief valve 42, so that the emissions in the housing space 91 can enter the exhaust space 92 and be discharged from the battery pack.

[0057] Optionally, the installation positions of the second pressure relief valve 42 and the fire-fighting component 5 can be selected according to requirements. The installation positions of the second pressure relief valve 42 and the fire-fighting component 5 will be described below in conjunction with Embodiment 1, Embodiment 2 and Embodiment 3.

[0058] Example 1

[0059] In this embodiment, as Figure 5 , Figure 8 , Figure 9 and Figure 10 As shown, the pressure relief hole 21 is located on the support plate 2 near the frame 111. The battery pack also includes an enclosure 61, which is L-shaped. The enclosure 61 is welded to the frame 111 and the support plate 2. The enclosure 61, the inner wall of the housing 11, and the support plate 2 form a connecting channel 611. The connecting channel 611 is connected to the installation space 91. Part of the second pressure relief valve 42 is located in the connecting channel 611, which allows the high-temperature gas in the installation space 91 to flow to the second pressure relief valve 42 through the connecting channel 611, and then be discharged through the second pressure relief valve 42, the exhaust space 92, and the first pressure relief valve 41.

[0060] Preferably, the dimension c of the connecting channel 611 in the first direction L1 is greater than the dimension b of the battery cell 3 in the first direction L1, so as to ensure that the battery cell 3 can be completely submerged in the fire-fighting liquid.

[0061] Furthermore, such as Figure 3 and Figure 6 As shown, the fire-fighting component 5 is welded onto the frame 111, and part of the fire-fighting component 5 is located outside the frame 111, while the other part extends into the installation space 91 to facilitate the injection of fire-fighting liquid or fire-fighting gas into the installation space 91.

[0062] Furthermore, in this embodiment, the orthographic projection of the second pressure relief valve 42 along the first direction L1 onto the support plate 2 and the orthographic projection of the fire-fighting component 5 along the first direction L1 onto the support plate 2 are located on different sides of the support plate 2 in the second direction L2. Additionally, the orthographic projection of the second pressure relief valve 42 along the first direction L1 onto the support plate 2 and the orthographic projection of the fire-fighting component 5 along the first direction L1 onto the support plate 2 are located on different sides of the support plate 2 in the third direction L3. That is, the second pressure relief valve 42 and the fire-fighting component 5 are arranged diagonally to prevent the fire-fighting gas from being directly discharged from the second pressure relief valve 42 into the exhaust space 92 when fire-fighting gas is injected into the installation space 91.

[0063] Alternatively, in this embodiment, the fire-fighting component 5 can also be welded to the cover plate.

[0064] In addition, the fire-fighting component 5 can also be arranged in the following two ways. In the first arrangement, the orthographic projection of the fire-fighting component 5 along the first direction L1 onto the support plate 2 is located on different sides of the support plate 2 in the second direction L2, and the orthographic projection of the second pressure relief valve 42 along the first direction L1 onto the support plate 2 and the orthographic projection of the fire-fighting component 5 along the first direction L1 onto the support plate 2 are located on the same side of the support plate 2 in the third direction L3. That is, the fire-fighting component 5 and the second pressure relief valve 42 are arranged at two corners on the same side of the second direction L2. In the second arrangement, the orthographic projection of the fire-fighting component 5 along the first direction L1 onto the support plate 2 is located on the same side of the support plate 2 in the second direction L2, and the orthographic projection of the second pressure relief valve 42 along the first direction L1 onto the support plate 2 and the orthographic projection of the fire-fighting component 5 along the first direction L1 onto the support plate 2 are located on different sides of the support plate 2 in the third direction L3. That is, the fire-fighting component 5 and the second pressure relief valve 42 are arranged at two corners on the same side of the third direction L3. The above two arrangements can also prevent the fire-fighting gas from being directly discharged from the second pressure relief valve 42 to the exhaust space 92 when the fire-fighting gas is injected.

[0065] Example 2

[0066] In this embodiment, as Figure 11 and Figure 12 As shown, the pressure relief hole 21 is located on the support plate 2 near the support beam 13. The battery pack also includes a surrounding member 61, which is welded to the support beam 13. The surrounding member 61 surrounds the connecting hole 22 and is welded to the support plate 2. The surrounding member 61, the support plate 2, and the support beam 13 form a connecting channel 611, which communicates with the mounting space 91. A portion of the second pressure relief valve 42 is located within the connecting channel 611. High-temperature gas generated by thermal runaway can flow through the connecting channel 611 to the second pressure relief valve 42, and then be discharged through the second pressure relief valve 42, the exhaust space 92, and the first pressure relief valve 41.

[0067] Preferably, the dimension c of the connecting channel 611 in the first direction L1 is greater than the dimension b of the battery cell 3 in the first direction L1, which allows the battery cell 3 to be completely submerged in the fire-fighting liquid.

[0068] Furthermore, such as Figure 11 and Figure 12 As shown, fire-fighting component 5 is welded to the cover plate, and part of fire-fighting component 5 is located outside the cover plate, while the other part extends into the installation space 91 to facilitate the injection of fire-fighting liquid or fire-fighting gas into the installation space 91.

[0069] It should be noted that, in order to clearly illustrate the internal structure of the battery pack housing 11, in Figure 11 and Figure 12 The cover plate was concealed within the battery pack, and the fire-fighting component 5 was welded to the cover plate.

[0070] Furthermore, in this embodiment, the orthographic projection of the second pressure relief valve 42 along the first direction L1 onto the support plate 2 and the orthographic projection of the fire-fighting component 5 along the first direction L1 onto the support plate 2 are located on different sides of the support plate 2 in the second direction L2. Moreover, the orthographic projection of the second pressure relief valve 42 along the first direction L1 onto the support plate 2 and the orthographic projection of the fire-fighting component 5 along the first direction L1 onto the support plate 2 are located on different sides of the support plate 2 in the third direction L3. That is, the second pressure relief valve 42 and the fire-fighting component 5 are arranged diagonally. This can prevent the fire-fighting gas from being directly discharged from the second pressure relief valve 42 to the exhaust space 92 when the fire-fighting gas is injected into the installation space 91.

[0071] Optionally, in this embodiment, the fire-fighting component 5 can also be installed on the cover plate. The fire-fighting component 5 and the second pressure relief valve 42 can be arranged at two corners on the same side of the second direction L2, or the fire-fighting component 5 and the second pressure relief valve 42 can also be arranged at two corners on the same side of the third direction L3. In this case, it can also be avoided that the fire-fighting gas is directly discharged from the second pressure relief valve 42 to the exhaust space 92 when the fire-fighting gas is injected.

[0072] Example 3

[0073] In this embodiment, the support beam 13 has a connecting channel 611 extending along the first direction L1, and the support beam 13 has an opening, so that the connecting channel 611 is connected to the placement space 91 through the opening. Part of the second pressure relief valve 42 is located in the connecting channel 611. The high-temperature gas generated by thermal runaway can flow through the opening, the connecting channel 611 and the second pressure relief valve 42 to the exhaust space 92 and then be discharged through the first pressure relief valve 41.

[0074] Preferably, the dimension of the connecting channel 611 in the first direction L1 is larger than the dimension b of the battery cell 3 in the first direction L1, so as to ensure that the battery cell 3 can be completely submerged in the fire-fighting liquid.

[0075] Furthermore, in this embodiment, the support beam 13 integrates the function of the surrounding member 61 in Embodiments 1 and 2, eliminating the need for the surrounding member 61, thus saving internal space in the battery pack housing 11 and improving the space utilization of the battery pack. Simultaneously, it reduces the weight of the battery pack and increases its energy density.

[0076] In this embodiment, the fire-fighting component 5 is welded to the cover plate or frame 111, and part of the fire-fighting component 5 is located outside the cover plate, while the other part extends into the installation space 91 to facilitate the injection of fire-fighting liquid or fire-fighting gas into the installation space 91.

[0077] Furthermore, in this embodiment, the second pressure relief valve 42 and the fire-fighting component 5 can be arranged diagonally, or the fire-fighting component 5 and the second pressure relief valve 42 can be arranged at two corners on the same side of the second direction L2, or the fire-fighting component 5 and the second pressure relief valve 42 can also be arranged at two corners on the same side of the third direction L3, so as to avoid the fire-fighting gas being directly discharged from the second pressure relief valve 42 to the exhaust space 92 when the fire-fighting gas is injected.

[0078] When cell 3 in the battery pack of this application experiences thermal runaway, high-temperature gas is ejected from the explosion-proof valve 31, then enters the exhaust space 92 through the pressure relief hole 21, and is discharged through the first pressure relief valve 41. When the battery pack is compressed, cell 3 may discharge high-temperature gas into the housing space 91. At this time, the high-temperature gas can flow to the second pressure relief valve 42, and then be discharged through the second pressure relief valve 42, the exhaust space 92, and the first pressure relief valve 41. In the event of severe thermal runaway, fire-fighting liquid or fire-fighting gas can be injected into the housing space 91 through the fire-fighting component 5 to achieve flame retardancy of cell 3.

[0079] According to another aspect of this application, an electrical device is provided, which includes the aforementioned battery pack and has the same technical effects as the aforementioned battery pack, which will not be repeated here.

[0080] Alternatively, the electrical device can be a vehicle, an energy storage power source, etc.

[0081] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such 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 utility model.

Claims

1. A battery pack having a first direction (LI), a second direction (L2), and a third direction (L3) that intersect two by two, characterized by, The battery pack comprises a box body (11) having a containing cavity (9), a support plate (2) connected with the inner side wall of the containing cavity (9) to divide the containing cavity (9) into a placing space (91) and an exhaust space (92), the plane of the support plate (2) intersects the first direction (L1), and an electric core (3) disposed in the placing space (91) and connected with the support plate (2), the electric core (3) has an explosion-proof valve (31). The support plate (2) is provided with a pressure relief hole (21) and a communication hole (22), the pressure relief hole (21) communicates with the exhaust space (92), the normal projection of the explosion-proof valve (31) on the support plate (2) along the first direction (L1) is located in the pressure relief hole (21), the placing space (91) and the exhaust space (92) communicate through the communication hole (22), and the normal projection of the communication hole (22) and the electric core (3) on the plane of the support plate (2) along the first direction (L1) is spaced apart.

2. The battery pack of claim 1, wherein, The battery pack further comprises a second pressure relief valve (42) disposed in the communication hole (22).

3. The battery pack of claim 2, wherein, The battery pack further comprises a fire-fighting member (5) fixed on the box body (11), and the fire-fighting member (5) communicates with the placing space (91).

4. The battery pack of claim 3, wherein, The distance (a) between the fire-fighting member (5) and the support plate (2) along the first direction (L1) is greater than the size (b) of the electric core (3) along the first direction (L1).

5. The battery pack of claim 1, wherein, The battery pack further comprises a surrounding member (61) connected with the box body (11) and the support plate (2) respectively, and the surrounding member (61), the inner side wall of the containing cavity (9) and the support plate (2) surround a connecting channel (611) which communicates with the placing space (91). The size (c) of the connecting channel (611) along the first direction (L1) is greater than the size (b) of the electric core (3) along the first direction (L1).

6. The battery pack of claim 1, wherein, The battery pack further comprises a support beam (13) disposed in the placing space (91) and connected with the support plate (2) and the box body (11). The support beam (13) is provided with a connecting channel (611) extending along the first direction (L1), and the connecting channel (611) communicates with the placing space (91). The size (c) of the connecting channel (611) along the first direction (L1) is greater than the size (b) of the electric core (3) along the first direction (L1).

7. The battery pack of claim 1, wherein, The battery pack further comprises a heat-conducting member (62) comprising a first bonding surface (S1) and a second bonding surface (S2) opposite to each other along the first direction (L1), the first bonding surface (S1) is bonded with the electric core (3), and the second bonding surface (S2) is bonded with the support plate (2).

8. The battery pack of any one of claims 1-7, wherein, The number of the electric cells is multiple, multiple relief holes (21) are arranged on the support plate (2), multiple electric cells (3) correspond to the multiple relief holes (21) one by one, and the orthographic projection of the electric cell (3) on the support plate (2) in the first direction (L1) is located in the relief hole (21) corresponding to the electric cell (3).

9. The battery pack of claim 3, wherein, The orthographic projection of the second relief valve (42) on the support plate (2) in the first direction (L1) and the orthographic projection of the fire-fighting element (5) on the support plate (2) in the first direction (L1) are located on different sides of the support plate (2) in the second direction (L2) and / or the third direction (L3).

10. The battery pack of claim 3, wherein, The orthographic projection of the electric cell (3) on the support plate (2) in the first direction (L1) and the orthographic projection of the fire-fighting element (5) on the support plate (2) in the first direction (L1) are arranged at intervals.

11. The battery pack of claim 2, wherein, The battery pack further comprises a bottom plate (12) and a first relief valve (41), the bottom plate (12) is connected to the box (11) and defines the exhaust space (92) with the box (11) and the support plate (2), the bottom plate (12) is provided with a mounting hole (121), the mounting hole (121) is in communication with the exhaust space (92), and the first relief valve (41) is mounted in the mounting hole (121), the opening pressure of the first relief valve (41) is greater than the opening pressure of the second relief valve (42).

12. An electrical device, characterized by The power consumption device comprises the battery pack of any one of claims 1-11. The number of the electric cells is multiple, multiple relief holes (21) are arranged on the support plate (2), multiple electric cells (3) correspond to the multiple relief holes (21) one by one, and the orthographic projection of the electric cell (3) on the support plate (2) in the first direction (L1) is located in the relief hole (21) corresponding to the electric cell (3). The orthographic projection of the second relief valve (42) on the support plate (2) in the first direction (L1) and the orthographic projection of the fire-fighting element (5) on the support plate (2) in the first direction (L1) are located on different sides of the support plate (2) in the second direction (L2) and / or the third direction (L3). The orthographic projection of the electric cell (3) on the support plate (2) in the first direction (L1) and the orthographic projection of the fire-fighting element (5) on the support plate (2) in the first direction (L1) are arranged at intervals. The battery pack further comprises a bottom plate (12) and a first relief valve (41), the bottom plate (12) is connected to the box (11) and defines the exhaust space (92) with the box (11) and the support plate (2), the bottom plate (12) is provided with a mounting hole (121), the mounting hole (121) is in communication with the exhaust space (92), and the first relief valve (41) is mounted in the mounting hole (121), the opening pressure of the first relief valve (41) is greater than the opening pressure of the second relief valve (42). The power consumption device comprises the battery pack of any one of claims 1-11.

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