Battery pack and electric device

Abstract

The present disclosure relates to the technical field of batteries. Disclosed are a battery pack and an electric device. The battery pack comprises a plurality of battery cells, connecting sheets and a case. Each battery cell comprises a mounting wall, poles and an explosion-proof valve, an explosion-proof hole is formed in the mounting wall, the poles are arranged on the mounting wall, and the explosion-proof valve is arranged on the mounting wall and covers the explosion-proof hole. The poles of every two adjacent battery cells are connected by means of the connecting sheets. A plurality of through holes and a plurality of placement slots are formed in the bottom wall of the case, the through holes are arranged corresponding to the explosion-proof holes, the through holes and the placement slots are arranged at intervals, and the connecting sheets are arranged in the placement slots. The battery cells are arranged in the case, the mounting walls are arranged towards the bottom wall, and the edges of the explosion-proof holes are connected in a sealed manner to the edges of the through holes.

Description

Battery packs and electrical equipment

[0001] This application claims priority to Chinese Patent Application No. 202410541168.7, filed on April 26, 2024, entitled "Battery Pack and Electrical Equipment", the entire contents of which are incorporated herein by reference. Technical Field

[0002] The embodiments of this application relate to, but are not limited to, a battery pack and an electrical device. Background Technology

[0003] Cell-to-pack (CTP) technology is a technology that directly assembles batteries into a battery pack, improving space utilization by reducing or eliminating module structures. While adjacent individual cells are connected via connectors, directly connecting the cells and connectors before placing them into the battery pack means that if one cell experiences thermal runaway, the emitted high-temperature gases can affect other cells, thus compromising the safety of the entire battery pack. Summary of the Invention

[0004] The following is an overview of the subject matter described in detail herein. This overview is not intended to limit the scope of the claims.

[0005] This application provides a battery designed to improve the safety of a battery pack; another objective of this application is to provide an electrical device.

[0006] In a first aspect, a battery pack according to an embodiment of this application includes:

[0007] Multiple individual batteries, each individual battery including a mounting wall, a terminal post, and an explosion-proof valve, the mounting wall including an explosion-proof hole, the terminal post disposed on the mounting wall, and the explosion-proof valve disposed on the mounting wall and covering the explosion-proof hole;

[0008] A connecting piece, wherein the connecting piece connects the terminals of two adjacent individual cells;

[0009] The enclosure includes a bottom wall, on which multiple through holes and multiple placement slots are provided. The through holes are corresponding to the explosion-proof holes, and the through holes and placement slots are spaced apart. The connecting piece is disposed in the placement slot.

[0010] The individual battery is disposed inside the housing, with the mounting wall facing the bottom wall. The edge of the explosion-proof hole is sealed to the edge of the through hole, so that the gas ejected by the explosion-proof valve is isolated from the inside of the housing and discharged directly into the through hole.

[0011] In some embodiments, the battery pack has a vertical orientation, the mounting wall is abutting the bottom wall, and the explosion-proof hole, when projected onto the bottom wall, falls into or coincides with the through hole. The battery pack satisfies the following conditions:

[0012] D = H1 + H2,

[0013] Wherein, D mm is the depth of the placement groove along the vertical direction, H1 mm is the height of the pole along the vertical direction, and H2 mm is the height of the connecting piece along the vertical direction. In some embodiments, it further includes:

[0014] A venting structure is provided, wherein the explosion-proof vent communicates with the through hole through the venting structure, and the venting structure is sealed to the explosion-proof vent. Simultaneously, the venting structure is sealed to the through hole, and the battery pack satisfies the following conditions:

[0015] D1>H1+H2,

[0016] Wherein, D1mm is the depth of the placement groove along the vertical direction, H1mm is the height of the pole along the vertical direction, and H2mm is the height of the connecting piece along the vertical direction.

[0017] In some embodiments, the venting structure is a protrusion surrounding the edge of the explosion-proof hole. The venting structure surrounds the edge of the through hole and is fixedly connected to the bottom wall. The height of the protrusion along the vertical direction is H3mm, and the gap between the mounting wall and the bottom wall along the vertical direction is L1mm. The battery pack satisfies:

[0018] H3=L1.

[0019] In some embodiments, the gas guiding structure is a gas guiding pipe, which has a first port and a second port. The first port surrounds the edge of the explosion-proof hole and is sealed to the single battery cell. The second port surrounds the edge of the through hole and is sealed to the bottom wall, so that a sealed gas guiding structure is formed between the explosion-proof hole and the through hole.

[0020] In some embodiments, the battery pack further includes a first base plate disposed on the side of the bottom wall away from the individual battery cell, and a first venting area is formed between the first base plate and the bottom wall, the first venting area communicating with the through hole.

[0021] In some embodiments, the housing further includes a plurality of frames, which are sequentially connected to form an accommodating space, and the single battery, the bottom wall, and the first bottom plate are disposed within the accommodating space;

[0022] The enclosure also includes an isolation plate disposed within the accommodating space. A second venting area is formed between the isolation plate and the frame. The second venting area is located on the side of the isolation plate away from the individual battery and is connected to the first venting area.

[0023] In some embodiments, the frame is provided with an exhaust hole, which communicates with the second exhaust area.

[0024] In some embodiments, the frame and the bottom wall are an integral structure.

[0025] In some embodiments, the battery pack further includes a buffer plate disposed on the side of the first base plate away from the bottom wall, and the side of the buffer plate opposite to the first base plate is provided with a buffer structure, which is disposed on the surface of the buffer plate.

[0026] In some embodiments, the buffer plate has a groove on the side opposite to the first base plate, and the buffer structure is disposed in the groove.

[0027] In some embodiments, the buffer structure includes a plurality of spaced elastic protrusions, the groove has a bottom wall, the plurality of elastic protrusions are disposed in the groove, and the elastic protrusions are connected to the bottom wall.

[0028] In some embodiments, the buffer structure includes a plurality of buffer ribs, the groove has a bottom wall, the plurality of buffer ribs are disposed in the groove, the buffer ribs are connected to the bottom wall, the plurality of buffer ribs are connected to each other in a mesh-like arrangement, and form a plurality of first buffer spaces with the bottom wall.

[0029] In some embodiments, the first buffer space has a buffer opening, which is polygonal in shape.

[0030] In some embodiments, the battery pack further includes:

[0031] The second base plate is disposed on the side of the buffer plate away from the first base plate, and the second base plate is connected to the isolation plate, forming a second buffer space between the second base plate, the isolation plate and the buffer plate.

[0032] Secondly, an electrical device provided in this application includes the battery pack described in any of the above embodiments.

[0033] The battery pack of this application embodiment includes: multiple individual batteries, each individual battery including a mounting wall, a terminal post, and an explosion-proof valve. The mounting wall includes an explosion-proof hole, the terminal post is disposed on the mounting wall, and the explosion-proof valve is disposed on the mounting wall and covers the explosion-proof hole; a connecting piece, the connecting piece connecting the terminal posts of two adjacent individual batteries; a housing, the housing including a bottom wall, the bottom wall having multiple through holes and multiple placement slots, the through holes corresponding to the explosion-proof holes, the through holes and placement slots being spaced apart, and the connecting piece being disposed in the placement slot; individual batteries are disposed in the housing, the mounting wall facing the bottom wall, and the edge of the explosion-proof hole is sealed to the edge of the through hole, so that the gas ejected by the explosion-proof valve upon explosion is isolated from the interior of the housing and directly discharged into the through hole. Thus, the explosion-proof hole is on the same side as the terminal post and faces the bottom wall, and the battery pack vents through the bottom, with the venting direction away from the electrical equipment to improve the safety of the electrical equipment. In addition, the edges of the explosion-proof holes and the through holes are sealed together, allowing individual cells to discharge high-temperature gas independently in the event of thermal runaway, while adjacent cells do not affect each other, preventing high-temperature gas from escaping into the box and causing thermal runaway in cells that are in normal condition.

[0034] The electrical equipment in this application embodiment may include all the technical features and beneficial effects of the battery pack described above, which will not be repeated here. Attached Figure Description

[0035] The accompanying drawings used in the following description of the embodiments will be briefly introduced. The drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0036] Figure 1 is a schematic diagram of the exploded structure of the battery pack provided in an embodiment of this application;

[0037] Figure 2 is a schematic diagram of the exploded structure of the battery pack provided in the embodiment of this application, viewed from another angle;

[0038] Figure 3 is a three-dimensional structural diagram of a single battery cell in the battery pack of this application embodiment;

[0039] Figure 4 is a three-dimensional structural diagram of the battery pack housing in an embodiment of this application;

[0040] Figure 5 is a schematic diagram of the three-dimensional structure of the battery in the battery pack of this application viewed from another angle;

[0041] Figure 6 is a schematic diagram of the cross-sectional structure of AA in Figure 5;

[0042] Figure 7 is a three-dimensional structural diagram of the buffer plate in the battery pack according to an embodiment of this application;

[0043] Figure 8 is a partial structural diagram of the battery pack containing the slot, terminal post and connecting piece according to an embodiment of this application;

[0044] The main reference numerals in the drawings of this application are explained as follows:

[0045] 100 - Single cell; 110 - Terminal post; 120 - Explosion-proof valve; 130 - Connecting piece; 140 - Mounting wall; 141 - Explosion-proof hole;

[0046] 200 - Housing; 210 - Bottom wall; 211 - Through hole; 212 - Placement slot; 220 - Frame; 221 - Exhaust hole; 230 - Accommodation space; 240 - Isolation plate; 250 - Second exhaust area; 260 - Air guiding structure;

[0047] 300 - First floor plate; 310 - First exhaust area;

[0048] 400 - Buffer plate; 410 - Buffer structure; 411 - Buffer rib; 412 - First buffer space; 420 - Groove; 500 - Second base plate;

[0049] 510 - Second buffer space;

[0050] X - Vertical direction.

[0051] After reading and understanding the accompanying diagrams and detailed descriptions, the other aspects can be understood. Embodiments of the present invention

[0052] 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 some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0053] In the description of this application, it should be understood that the terms "length," "width," "height," "upper," "lower," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are used 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 of this application. 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.

[0054] The applicant noted that in existing battery packs, adjacent individual cells need to be connected by connectors. However, if the cells are directly connected to the connectors and placed into the battery pack, and one of the individual cells experiences thermal runaway, the high-temperature gas emitted will come into contact with other individual cells along the exhaust area inside the battery pack, thereby affecting the operation of other individual cells and thus affecting the safety of the battery pack.

[0055] In view of this, embodiments of this application provide a battery pack that isolates the venting area of ​​the explosion-proof valve from the individual battery cells, thereby improving the safety of the battery pack.

[0056] Please refer to Figures 1, 2, 3, and 4 together. Figure 1 is an exploded view of the battery pack provided in an embodiment of this application; Figure 2 is a view of the exploded structure of the battery pack provided in an embodiment of this application viewed from another angle; Figure 3 is a three-dimensional view of the individual battery cells in the battery pack of an embodiment of this application; Figure 4 is a three-dimensional view of the housing in the battery pack of an embodiment of this application. In this embodiment of the application, the battery pack includes multiple individual battery cells 100, connecting pieces 130, and a housing 200.

[0057] Specifically, in some embodiments, the single cell 100 includes a mounting wall 140, a terminal post 110, and an explosion-proof valve 120. The mounting wall 140 includes an explosion-proof hole 141. The terminal post 110 is disposed on the mounting wall 140, and the explosion-proof valve 120 is disposed on the mounting wall 140 and covers the explosion-proof hole 141. A connecting piece 130 connects the terminal posts 110 of two adjacent single cells 100. A housing 200 includes a bottom wall 210, on which multiple... The device includes a through hole 211 and multiple placement slots 212. The through hole 211 is correspondingly provided with the explosion-proof hole 141, and the through hole 211 and the placement slots 212 are spaced apart. The connecting piece 130 is provided in the placement slot 212. The single battery 100 is provided in the housing 200, and the mounting wall 140 is provided facing the bottom wall 210. The edge of the explosion-proof hole 141 is sealed to the edge of the through hole 211 so that the gas ejected by the explosion-proof valve 120 is isolated from the inside of the housing 200 and is directly discharged into the through hole 211.

[0058] It should be noted that in existing battery packs, the terminals 110 and the explosion-proof vent 141 are positioned on opposite sides. After the connecting piece 130 connects the terminals 110 of two adjacent individual cells 100, one side of the terminal 110 of the individual cell 100 faces the bottom wall of the housing 200, while the explosion-proof valve 120 faces the side of the electrical equipment. Taking an electric vehicle as an example, with the above installation method, the explosion-proof valve 120 would face the direction of the driver's cab. If one of the individual cells 100 in the battery pack experiences thermal runaway, the high-temperature gas ejected through the explosion-proof valve 120 could easily penetrate the vehicle body and enter the vehicle, directly threatening the personal safety of the occupants. Therefore, in this application, the explosion-proof vent 141 is positioned on the same side as the terminal 110, so that in the event of thermal runaway of one of the individual cells 100, the high-temperature gas discharged through the explosion-proof valve 120 can be discharged from the bottom of the vehicle, providing valuable escape time for the occupants.

[0059] Furthermore, in existing battery packs, each individual cell 100 is directly exposed to the exhaust area connected by the explosion-proof vent 141. If one of the individual cells 100 in the battery pack experiences thermal runaway, the high-temperature gas released into the exhaust area can come into contact with other normally functioning individual cells, easily triggering a chain reaction of thermal runaway and exacerbating the consequences. In contrast, the edge of the through-hole 211 in this application is sealed to the edge of the explosion-proof vent 141. After the high-temperature gas ejected by the explosion-proof valve 120 bursts, it passes through the through-hole 211 and is isolated from other individual cells 100 by the housing 200, preventing the high-temperature gas from escaping into the housing and causing thermal runaway in normally functioning individual cells.

[0060] Please refer to Figure 1 again. In some embodiments, there are multiple through holes 211, which are the same number as the number of explosion-proof valves 120. The orthographic projection of the explosion-proof valves 120 on the bottom wall 210 is at least partially located in the through holes 211.

[0061] It should be noted that there are various situations in which the edge of the explosion-proof hole 141 and the edge of the through hole 211 can be sealed. For example, the explosion-proof valve 120 may be aligned with the through hole 211, or the explosion-proof valve 120 may be misaligned with the through hole 211. It is only necessary to ensure that the orthogonal projection of the explosion-proof valve 120 on the bottom wall 210 is at least partially located inside the through hole 211, so that the edge of the explosion-proof hole 141 and the edge of the through hole 211 can still maintain communication after the sealing connection is achieved.

[0062] Please refer to Figure 8, which illustrates a partial structural diagram of the battery pack containing the slot, terminal post, and connecting piece according to an embodiment of this application. In some embodiments, the battery pack has a vertical direction X, the mounting wall 140 is attached to the bottom wall 210, and the orthogonal projection of the explosion-proof hole 141 on the bottom wall 210 falls into or coincides with the through hole 211. The battery pack satisfies the following:

[0063] D = H1 + H2;

[0064] Wherein, D mm is the depth of the placement groove 212 along the vertical direction X, H1 mm is the height of the pole post 110 along the vertical direction X, and H2 mm is the height of the connecting piece 130 along the vertical direction X.

[0065] It should be noted that in this embodiment, existing dimensional measuring tools such as vernier calipers and micrometers are used to measure H1, H2, and H3, and H1, H2, and H3 are all dimensions along the bottom wall 210 pointing towards the single battery cell 100. At this time, the sum of the heights of the terminal post 110 and the connecting piece 130 is equal to the depth of the placement groove 212, so that after the terminal post 110 and the connecting piece 130 are placed into the placement groove 212, the explosion-proof valve 120 seals the through hole 211, and the explosion-proof valve 120 is fixedly connected to the bottom wall 210. Thus, while achieving a sealed connection between the edge of the explosion-proof hole 141 and the edge of the through hole 211, the depth space of the placement groove 212 is fully utilized, saving space inside the battery pack.

[0066] In some embodiments, the explosion-proof valve 120 is welded to the bottom wall 210.

[0067] It should be noted that there are various methods of fixed connection, such as welding, bolting, bonding, orifice connection, and tight-fitting connection. Considering the limited space in the battery pack and the high requirements for the sealing connection between the edge of the explosion-proof hole 141 and the edge of the through hole 211 in this application, welding can be selected between the explosion-proof valve 120 and the bottom wall 210. Welding has the characteristics of high strength, good sealing performance, high efficiency, and wide application. Welding between the explosion-proof valve 120 and the bottom wall 210 helps the connection point to evenly bear the load and avoids the failure of the sealing connection between the explosion-proof valve 120 and the bottom wall 210 due to the impact of high-temperature gas. In addition, welding can completely seal the explosion-proof valve 120 and the bottom wall 210, improving the safety and reliability of the battery pack. Welding is also highly efficient, which helps to improve the production efficiency of the battery pack. Furthermore, welding is applicable to various fields, such as aviation, shipbuilding, and automobiles, which can broaden the application scenarios of the battery pack in this application.

[0068] In some embodiments, the battery pack further includes a venting structure 260, through which the explosion-proof vent 141 communicates with the through-hole 211. The venting structure 260 and the explosion-proof vent 141 are sealed together, and the venting structure and the through-hole 211 are also sealed together. The battery pack satisfies the following conditions:

[0069] D>H1+H2;

[0070] Wherein, D mm is the depth of the placement groove 212 along the vertical direction X, H1 mm is the height of the pole post 110 along the vertical direction X, and H2 mm is the height of the connecting piece 130 along the vertical direction X.

[0071] It should be noted that in this embodiment, existing dimensional measuring tools such as vernier calipers and micrometers are used to measure H1, H2, and H3, and H1, H2, and H3 are all dimensions along the bottom wall 210 pointing towards the single battery cell 100. At this time, the sum of the heights of the terminal post 110 and the connecting piece 130 is greater than the depth of the placement groove 212, resulting in a certain gap between the edge of the explosion-proof hole 141 and the edge of the through hole 211 after the terminal post 110 and the connecting piece 130 are placed into the placement groove 212. To achieve a sealed connection between the explosion-proof valve 120 and the through hole 211, an additional venting structure 260 (not shown in the figure) is required. The venting structure 260 needs to be sealed to both the explosion-proof valve 120 and the through hole 211. Thus, while achieving a sealed connection between the explosion-proof hole 141 and the through hole 211, the depth of the placement groove 212 is reduced, saving space inside the battery pack.

[0072] In some embodiments, the venting structure 260 is a protrusion surrounding the edge of the explosion-proof hole 141. The venting structure 260 surrounds the edge of the through hole 211 and is fixedly connected to the bottom wall 210. The height of the protrusion along the vertical direction X is H3mm, and the gap between the mounting wall 140 and the bottom wall 210 along the vertical direction X is L1mm. The battery pack satisfies:

[0073] H3=L1;

[0074] It should be noted that in this embodiment, existing dimensional measuring tools such as vernier calipers and micrometers are used to measure L1 and H3, and both L1 and H3 are dimensions along the bottom wall 210 pointing towards the single cell 100. At this time, the gas guiding structure 260 and the explosion-proof valve 120 are integrally formed, and the height of the protrusion of the gas guiding structure 260 is equal to the gap between the mounting wall 140 and the bottom wall 210. This achieves a sealed connection between the explosion-proof hole 141 and the through hole 211 while increasing the load capacity of the gas guiding structure 260. Combined with the welding between the gas guiding structure 260 and the through hole 211, the impact of high-temperature gas can prevent the sealing connection between the explosion-proof valve 120 and the bottom wall 210 from failing.

[0075] In some embodiments, the gas guiding structure 260 is a gas guiding pipe with a first port and a second port. The first port surrounds the edge of the explosion-proof hole 141 and is sealed to the single cell 100. The second port surrounds the edge of the through hole 211 and is sealed to the bottom wall 210, so that a sealed gas guiding is formed between the explosion-proof hole 141 and the through hole 211.

[0076] It should be noted that when the gas guiding structure 260 is a gas guiding pipe, the first port of the gas guiding pipe surrounds the explosion-proof valve 120, and the second port surrounds the through hole 211, so that a sealed gas guiding system is formed between the explosion-proof hole 141 and the through hole 211. In this case, attention should also be paid to the material selection of the gas guiding structure 260. A material that is resistant to high temperature and high pressure and has good sealing properties should be selected, such as fluororubber (FKM), fluoropolymer (FFKM), or polytetrafluoroethylene (PTFE). In this way, while achieving a sealed connection between the explosion-proof hole 141 and the through hole 211, the impact of high-temperature gas can prevent the sealing connection between the explosion-proof valve 120 and the bottom wall 210 from failing.

[0077] Please refer to Figures 4, 5, and 6. Figure 4 is a three-dimensional structural diagram of the battery pack housing in an embodiment of this application; Figure 5 is a three-dimensional structural diagram of the battery in the battery pack in an embodiment of this application viewed from another angle; Figure 6 is a cross-sectional structural diagram of AA in Figure 5; In some embodiments of this application, the battery pack further includes a first bottom plate 300, which is disposed on the side of the bottom wall 210 away from the individual battery 100. A first venting area 310 is formed between the first bottom plate 300 and the bottom wall 210, and the first venting area 310 communicates with the through hole 211.

[0078] It should be noted that the first exhaust zone 310 is the first exhaust zone into which the high-temperature gas enters after being discharged from the explosion-proof valve 120. When the high-temperature gas discharged from a certain explosion-proof valve 120 passes through the through hole 211 and enters the first exhaust zone 310, the high-temperature gas is isolated from the individual battery 100 by the bottom wall 210, preventing the high-temperature gas from escaping into the box and causing thermal runaway of the normally functioning individual battery.

[0079] Please refer again to Figures 4, 5, and 6. In some embodiments, the housing 200 further includes multiple side frames 220 and a partition plate 240. The multiple side frames 220 are connected in sequence to form a receiving space 230, in which the single battery 100, the bottom wall 210, and the first bottom plate 300 are disposed. The partition plate 240 is disposed in the receiving space 230, and a second exhaust area 250 is formed between the partition plate 240 and the side frames 220. The second exhaust area 250 is located on the side of the partition plate 240 away from the single battery 100, and the second exhaust area 250 communicates with the first exhaust area 310.

[0080] It should be noted that the second exhaust zone 250 is the second exhaust zone into which high-temperature gas enters after being discharged from the explosion-proof valve 120. When high-temperature gas discharged from a certain explosion-proof valve 120 passes through the through hole 211 and enters the first exhaust zone 310, the high-temperature gas then enters the second exhaust zone 250 from the first exhaust zone 310. In this way, an additional exhaust zone is added to accommodate high-temperature gas in the event of thermal runaway. At the same time, the isolation plate 240 ensures that the high-temperature gas remains isolated from other individual cells 100 after entering the second exhaust zone 250, preventing high-temperature gas from escaping into the casing and causing thermal runaway in the normally functioning individual cells.

[0081] In some embodiments, the frame 220 is provided with an exhaust hole 221, which communicates with the second exhaust region 250.

[0082] It should be noted that when the high-temperature gas discharged from a certain explosion-proof valve 120 passes through the through hole 211 and enters the first exhaust area 310, the high-temperature gas then enters the second exhaust area 250 from the first exhaust area 310, and then exits the battery pack from the exhaust port 221. Throughout the exhaust process, due to the sealed connection between the explosion-proof port 141 and the through hole 211, and the design of the bottom wall 210, the high-temperature gas is isolated from other individual batteries after entering the first exhaust area 310; the isolation plate 240 ensures that the high-temperature gas remains isolated from other individual batteries 100 after entering the second exhaust area 250; and the exhaust port 221 determines the exhaust direction and position of the entire battery pack. In actual use, the direction and position of the exhaust port 221 can be flexibly set according to the structure of the electrical equipment and the usage scenario, thereby reducing the impact of the high-temperature gas discharge on the electrical equipment and improving the safety of the battery pack.

[0083] In some embodiments, the frame 220 and the bottom wall 210 are an integral structure.

[0084] It should be noted that by integrating the frame 220 and the bottom wall 210 into a single structure, the structure of the battery pack is simplified. At the same time, the single structure eliminates gaps and cracks at the contact surfaces and joints, improving the strength, water resistance, sealing, and fatigue resistance of the battery pack housing 200. In addition, the single structure also reduces the production cost of the battery pack.

[0085] Please refer again to Figures 1 and 2, and then to Figure 7. Figure 7 is a three-dimensional structural diagram of the buffer plate in the battery pack according to an embodiment of this application. In some embodiments of this application, the battery pack further includes a buffer plate 400. The buffer plate 400 is disposed on the side of the first base plate 300 away from the bottom wall 210, and a buffer structure 410 is provided on the side of the buffer plate 400 opposite to the first base plate 300.

[0086] It should be noted that, since the internal structure of the battery pack is subject to various factors such as vibration, collision, and temperature changes, which may impact the battery's base plate, this application includes a buffer plate 400 to reduce the impact of the impact on the first base plate 300. Furthermore, to enhance the buffering effect of the buffer plate 400, a buffer structure 410 is also provided. Specifically, when the first base plate 300 deforms under impact, it causes the buffer structure 410 to deform appropriately. The buffer structure 410 then absorbs the energy from the impact on the first base plate 300 through deformation, thereby reducing the impact force received by the first base plate 300.

[0087] In some embodiments, the buffer structure 410 may be disposed on the surface of the buffer plate 400 to improve the buffering effect of the buffer plate 400.

[0088] In some embodiments, the buffer plate 400 has a groove 420 on the side opposite to the first base plate 300, and the buffer structure 410 is disposed in the groove 420. The groove 420 provides a buffer area for the buffer structure 410 to improve the buffering effect of the buffer plate 400.

[0089] In some embodiments, the buffer structure 410 includes a plurality of spaced elastic protrusions (not shown in the figure), the groove 420 has a bottom wall, and the plurality of elastic protrusions are disposed within the groove 420. The elastic protrusions are connected to the bottom wall of the groove. Specifically, the elastic protrusions and the bottom wall of the groove can be integral, or the elastic protrusions can be connected and fixed to the bottom wall of the groove by means of adhesive, screw fixing, plugging, etc., which is not limited here. The elasticity of the elastic protrusions themselves provides a buffering effect for the buffer plate 400.

[0090] In some embodiments, the buffer structure 410 includes a plurality of buffer ribs 411, the groove 420 has a bottom wall, the plurality of buffer ribs 411 are disposed within the groove 420 and connected to the bottom wall, the plurality of buffer ribs 411 are interconnected in a mesh-like arrangement, and form a plurality of first buffer spaces 412 between themselves and the bottom wall. The first buffer spaces 412 are designed to provide deformation space for the buffer ribs 411. When the battery pack encounters strong vibration or sudden thermal runaway, the design of the buffer plate 400 can effectively mitigate the impact force on the first base plate 300, thereby improving the safety of the battery pack.

[0091] It should be noted that the multiple buffer ribs 411 are interconnected in a mesh-like arrangement, which increases the elasticity and freedom of the buffer plate 400 and enhances its cushioning effect. Furthermore, the mesh structure strengthens the connection between the individual buffer ribs 411, increasing the strength of the buffer plate 400.

[0092] In some embodiments, the first buffer space 412 has a buffer opening, which is polygonal in shape. It should be noted that when the buffer opening is polygonal, the stability of the mesh-like buffer ribs 411 can be improved. Optionally, the buffer opening is hexagonal in shape, in which case the buffer ribs 411 have triaxial stability, i.e., stability from top to bottom, from left to right, and from inside to outside. Thus, when the buffer plate 400 deforms, the buffer ribs 411 will generate triaxial supporting forces, improving the structural stability of the buffer plate 400, thereby enhancing the buffering effect on the entire battery pack. At the same time, the polygonal design can also save material for the buffer ribs 411, reducing the weight of the battery pack.

[0093] Furthermore, to achieve the functions of the aforementioned buffer plate 400, the materials of the buffer plate 400 and the buffer structure 410 need to be impact-resistant, deformation-resistant, and heat-resistant. In some embodiments of this application, materials such as silicone, rubber, and polyurethane can be used, or certain high-strength, wear-resistant, and chemically stable plastics, such as polycarbonate (PC), polyethylene (PE), and polypropylene (PP). If necessary, appropriate processes can also be combined to improve the performance of the buffer plate 400.

[0094] In some embodiments, the battery pack further includes a second base plate 500, which is disposed on the side of the buffer plate 400 away from the first base plate 300, and the second base plate 500 is connected to the separator plate 240, forming a second buffer space 510 between the second base plate 500, the separator plate 240 and the buffer plate 400.

[0095] It should be noted that the second base plate 500 is the outermost base plate of the entire battery pack. The second buffer space 510 formed between it and the buffer plate 400 not only reserves deformation space for the buffer plate 400, but also avoids the impact of the deformation of the buffer plate 400 on the external electrical equipment of the battery pack.

[0096] In some embodiments, the housing 200 is made of non-metallic material.

[0097] It should be noted that the casing 200 in this application is made of non-metallic material, which can effectively reduce the overall weight of the battery pack. Non-metallic materials have the advantages of corrosion resistance, good damping, strong plasticity and good heat insulation, which can effectively improve the performance and safety of the battery pack and ensure the reliability and stability of the battery pack during use.

[0098] Accordingly, this application provides an electrical device, which includes the secondary battery provided in the embodiment. The electrical device can be a vehicle, mobile phone, portable device, laptop, ship, spacecraft, electric toy, and power tool, 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, etc.; electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc.; 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, etc. This application does not impose any special limitations on the above-mentioned electrical device. It is understood that the electrical device can include all the technical features and beneficial effects of the above-mentioned battery pack, which will not be repeated here.

[0099] The battery pack and electrical equipment 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, comprising: Multiple individual batteries, each individual battery including a mounting wall, a terminal post, and an explosion-proof valve, the mounting wall including an explosion-proof hole, the terminal post disposed on the mounting wall, and the explosion-proof valve disposed on the mounting wall and covering the explosion-proof hole; A connecting piece, wherein the connecting piece connects the terminals of two adjacent individual cells; The enclosure includes a bottom wall, on which multiple through holes and multiple placement slots are provided. The through holes are corresponding to the explosion-proof holes, and the through holes and placement slots are spaced apart. The connecting piece is disposed in the placement slot. The individual battery is disposed inside the box, the mounting wall is positioned facing the bottom wall, and the explosion-proof hole is sealed to the through hole so that the gas ejected by the explosion-proof valve can be directly discharged into the through hole.

2. The battery pack according to claim 1, wherein, The mounting wall is attached to the bottom wall, and the edge of the explosion-proof hole is sealed to the edge of the through hole.

3. The battery pack according to claim 2, wherein, The explosion-proof hole's orthogonal projection onto the bottom wall falls into or coincides with the through hole.

4. The battery pack according to claim 1, wherein, The mounting wall includes a main body and a first protrusion. The protrusion protrudes towards the bottom wall. The pole is disposed on the main body. The explosion-proof hole is disposed on the first protrusion. The bottom wall is provided with a first recess at a position corresponding to the position of the protrusion.

5. The battery pack according to claim 1, wherein, The mounting wall includes a main body and a second recessed portion. The second recessed portion is recessed in a direction away from the bottom wall. The pole is disposed on the main body and the explosion-proof hole is disposed on the second recessed portion. The main body is attached to the bottom wall. The edge of the second recessed portion is sealed to the bottom wall. The second recessed portion and the bottom wall form a first sealed space so that the gas ejected by the explosion-proof valve can be discharged into the through hole through the first sealed space.

6. The battery pack according to claim 1, wherein, The mounting wall includes a main body and a second recessed portion. The second recessed portion is recessed in a direction away from the bottom wall. The pole is disposed in the main body and the explosion-proof hole is disposed in the second recessed portion. The bottom wall is provided with a second protrusion at a position corresponding to the second recessed portion. The through hole is disposed in the second protrusion. The second protrusion is inserted into the second recessed portion so that the explosion-proof hole and the through hole are sealed together.

7. The battery pack according to claim 6, wherein, A second sealing space is formed between the second protrusion and the second recess, so that the gas ejected by the explosion-proof valve can be discharged into the through hole through the second sealing space.

8. The battery pack according to any one of claims 1 to 7, wherein, The battery pack has a vertical orientation, and the projection of the explosion-proof hole onto the bottom wall falls into or coincides with the through hole. The battery pack satisfies the following: H2≤D≤H1+H2, Wherein, D mm is the depth of the placement groove along the vertical direction, H1 mm is the height of the pole along the vertical direction, and H2 mm is the height of the connecting piece along the vertical direction.

9. The battery pack according to claim 8, wherein, The connecting piece has a groove, and the pole is inserted into the groove. The height of the groove along the vertical direction is less than H2mm.

10. The battery pack according to claim 8, wherein, The connecting piece has through holes extending through its opposite sides along the vertical direction, and the pole piece is sleeved onto the connecting piece through the through holes.

11. The battery pack according to claim 1, wherein, The battery pack also includes a first base plate, which is disposed on the side of the bottom wall away from the individual battery cell. A first venting area is formed between the first base plate and the bottom wall, and the first venting area communicates with the through hole.

12. The battery pack according to claim 11, wherein, The housing also includes multiple frames, which are connected sequentially to form an accommodating space. The single battery, the bottom wall, and the first bottom plate are disposed within the accommodating space. The enclosure also includes an isolation plate disposed within the accommodating space. A second venting area is formed between the isolation plate and the frame, and the second venting area is located on the side of the isolation plate away from the individual battery. The second venting area is connected to the first venting area. The frame is provided with vent holes, which are connected to the second venting area.

13. The battery pack according to claim 12, wherein, The battery pack also includes a buffer plate, which is disposed on the side of the first base plate away from the bottom wall. The side of the buffer plate opposite to the first base plate has a buffer structure, which is disposed on the surface of the buffer plate.

14. The battery pack according to claim 13, wherein, The buffer plate has a groove on the side opposite to the first base plate, and the buffer structure is disposed in the groove.

15. The battery pack according to claim 14, wherein, The buffer structure includes a plurality of spaced elastic protrusions, the groove has a bottom wall, the plurality of elastic protrusions are disposed in the groove, and the elastic protrusions are connected to the bottom wall of the groove.

16. The battery pack according to claim 14, wherein, The buffer structure includes multiple buffer ribs, the groove has a bottom wall, the multiple buffer ribs are all disposed in the groove, the buffer ribs are connected to the bottom wall of the groove, the multiple buffer ribs are connected to each other in a mesh-like arrangement, and multiple first buffer spaces are formed between the buffer ribs and the bottom wall of the groove.

17. The battery pack according to claim 13, wherein, The battery pack also includes: The second base plate is disposed on the side of the buffer plate away from the first base plate, and the second base plate is connected to the isolation plate, forming a second buffer space between the second base plate, the isolation plate and the buffer plate.

18. An electrical appliance comprising a battery pack as described in any one of claims 1 to 17.

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