Battery pack and electric device

Abstract

A battery pack and an electric device, relating to the technical field of batteries. According to the battery pack, raised portions (112) projecting toward a top plate (120) are provided on a bottom plate (110) of a box body, the raised portions (112) are connected to bottom walls (210) of battery cells, and top walls (220) of the battery cells are connected to the top plate (120) of the box body, so that the raised portions (112) can form support below the battery cells, thus the battery cells (200) can be stably mounted in an accommodating cavity (140) of the box body (100), and the stability and safety of the battery pack are improved. In addition, explosion-proof valves (230) are provided on the bottom walls (210) of the battery cells, and the bottom walls (210) of the battery cells are arranged facing toward the bottom plate (110) of the box body, so that when thermal runaway occurs in the battery cells (200), the explosion-proof valves (230) can release pressure and exhaust air toward the bottom plate (110), thereby reducing the impact on the upper part of the battery pack and improving safety.

Description

Battery packs and electrical equipment

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on October 31, 2023, with application number 202322939297.5 and application name “Battery Pack and Electrical Equipment”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The embodiments of the present application relate to, but are not limited to, the field of battery technology. Background Art

[0003] With the continuous development of the new energy vehicle market, battery packs, as the core energy storage and supply devices of new energy vehicles, have attracted increasing attention to their safety. Currently, battery packs on the market usually have multiple battery cells inside, and each battery cell is equipped with an explosion-proof valve to facilitate pressure relief through the explosion-proof valve in the event of thermal runaway. In addition, in order to ensure the stable installation of battery cells in the battery pack, the battery cells are usually upright, and their explosion-proof valves are set upward. This means that the explosion-proof valve faces the passenger compartment during pressure relief, increasing the risk to passengers. If the battery cells are inverted, the battery cell installation stability will be insufficient, which will also affect the pressure relief of the explosion-proof valve and fail to ensure the safety of the battery pack.

[0004] Summary of the Invention

[0005] The following is a summary of the subject matter described in detail herein. This summary is not intended to limit the scope of the claims.

[0006] According to a first aspect of the present application, an embodiment of the present application provides a battery pack, comprising:

[0007] A box body, the box body having a first direction, the box body comprising a bottom plate and a top plate arranged opposite to each other along the first direction, the bottom plate comprising a plate body and a protrusion connected thereto, the protrusion protruding relative to the plate body toward the top plate, the box body having a receiving cavity, the receiving cavity being arranged between the bottom plate and the top plate;

[0008] a battery cell, the battery cell being disposed in the accommodating cavity, the battery cell comprising a bottom wall and a top wall disposed opposite each other along the first direction, the bottom wall being provided with an explosion-proof valve, the bottom wall being disposed toward the bottom plate and connected to the raised portion, and the top wall being connected to the top plate;

[0009] The protrusion has an exhaust channel and an air hole connected to the exhaust channel, and the air hole is arranged toward the battery cell;

[0010] An orthographic projection of the explosion-proof valve on the protruding portion along the first direction is at least partially located within the air hole.

[0011] In some embodiments, the number of the battery cells is multiple, and the area of ​​the bottom wall of each battery cell is A mm 2 The projection area of ​​the protrusion along the first direction on the bottom wall of each battery cell is B mm 2 ,satisfy:

[0012] 0.4≤B / A≤1.

[0013] In some embodiments, the housing has a second direction perpendicular to the first direction, the second direction is the extension direction of the exhaust channel, and the hole area of ​​the air hole is E mm 2 The cross-sectional area of ​​the exhaust channel along the second direction is F mm 2 ,satisfy:

[0014] 2 / 7<E / F<1 / 2.

[0015] In some embodiments, the bottom wall has an explosion-proof hole, the explosion-proof hole is opposite to the air hole along the first direction, and the explosion-proof hole and the air hole are sealed and connected, and the explosion-proof valve cover is sealed on the explosion-proof hole.

[0016] In some embodiments, the battery cells and the air holes are both provided in plural numbers, and the explosion-proof valve of each battery cell corresponds to one air hole.

[0017] In some embodiments, the housing further comprises:

[0018] A beam body, the beam body is connected between the bottom plate and the top plate, the beam body is provided with a confluence channel and a pressure relief device, the confluence channel has an air inlet and an air outlet, the air inlet is connected to the exhaust channel, and the pressure relief device is covered with the air outlet, wherein the air inlet is arranged on the side of the beam body close to the battery cell, the air outlet is arranged between the side of the beam body away from the battery cell, and the pressure relief device is arranged on the side of the beam body away from the battery cell.

[0019] In some embodiments, the protrusion extends along a second direction intersecting the first direction, and the protrusion has a first end and a second end oppositely disposed along the second direction, and the first end is provided with an exhaust hole;

[0020] The beam body is arranged at the first end, and the exhaust hole is communicated between the exhaust channel and the air inlet.

[0021] In some embodiments, a plurality of battery cells are disposed in the accommodating cavity, the plurality of battery cells are arranged in a row along the second direction, and a plurality of rows of battery cells are disposed in the accommodating cavity along a third direction, and the first direction, the second direction, and the third direction intersect;

[0022] The bottom plate includes a plurality of protrusions arranged along the third direction, and one protrusion is correspondingly connected to a row of battery cells.

[0023] In some embodiments, the protrusion is provided with avoidance spaces on both sides along the third direction, and the avoidance spaces are connected to the accommodating cavity;

[0024] The battery cell includes a pole arranged on the bottom wall, and the battery pack also includes a bus bar, which connects the poles of two adjacent battery cells. The poles and the bus bar are arranged in the avoidance space.

[0025] In some embodiments, a gap is provided between the pole and the plate, and the busbar is disposed in the gap.

[0026] In some embodiments, the battery pack further comprises:

[0027] A protective layer is connected between the bottom wall and the raised portion.

[0028] According to the second aspect of the present application, an embodiment of the present application provides an electrical device, comprising the battery pack described in any of the above embodiments.

[0029] The battery pack of an embodiment of the present application includes: a box body, the box body has a first direction, the box body includes a bottom plate and a top plate arranged opposite to each other along the first direction, the bottom plate includes a connected plate body and a protrusion, the protrusion protrudes toward the top plate relative to the plate body, the box body has a accommodating cavity, the accommodating cavity is arranged between the bottom plate and the top plate; a battery cell, the battery cell is arranged in the accommodating cavity, the battery cell includes a bottom wall and a top wall arranged opposite to each other along the first direction, the bottom wall is provided with an explosion-proof valve, the bottom wall is arranged toward the bottom plate and connected to the protrusion, and the top wall is connected to the top plate; the protrusion has an exhaust channel and an air hole connected to the exhaust channel, the air hole is arranged toward the battery cell; the orthographic projection of the explosion-proof valve on the protrusion along the first direction is at least partially located in the air hole. The battery pack is provided with a protruding portion protruding toward the top plate on the bottom plate of the box, and the protruding portion is used to connect the bottom wall of the battery cell, and the top wall of the battery cell is connected to the top plate of the box, so that the protruding portion can form a support under the battery cell, so that the battery cell can be firmly installed in the accommodating cavity of the box, thereby improving the stability and safety of the battery pack; on the other hand, by providing an explosion-proof valve on the bottom wall of the battery cell, and the bottom wall of the battery cell is arranged toward the bottom plate of the box, when the battery cell has thermal runaway, the explosion-proof valve can release pressure and exhaust toward the bottom plate, reducing the impact on the top of the battery pack and improving safety; and, the protruding portion is provided with an exhaust channel and an air hole, and the explosion-proof valve can release pressure toward the air hole when the valve breaks, and then the discharged high-temperature and high-pressure substances can be discharged from the exhaust channel, further ensuring the safety of the battery pack.

[0030] The electrical equipment of the embodiment of the present application may include all the technical features and beneficial effects of the above-mentioned battery pack, which will not be repeated here.

[0031] Still other aspects will become apparent upon reading and understanding the accompanying drawings and detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0033] FIG1 is a schematic diagram of the three-dimensional structure of a battery pack provided in an embodiment of the present application;

[0034] FIG2 is a schematic diagram of the exploded structure of the battery pack components in FIG1 ;

[0035] FIG3 is a schematic diagram of the exploded structure of parts of the battery pack according to an embodiment of the present application viewed from another angle;

[0036] FIG4 is a schematic diagram of the front structure of a battery pack according to an embodiment of the present application;

[0037] FIG5 is a schematic cross-sectional view of the battery pack along line AA in FIG4 ;

[0038] FIG6 is a schematic diagram of a partially enlarged structure of area A in FIG5 ;

[0039] FIG7 is a schematic perspective view of the cross-sectional structure in FIG5 ;

[0040] FIG8 is a schematic diagram of a partially enlarged structure of area B in FIG7 ;

[0041] FIG9 is a schematic cross-sectional view of the battery pack along line BB in FIG4 ;

[0042] FIG10 is a schematic diagram of a partially enlarged structure of area C in FIG9 ;

[0043] FIG11 is a schematic perspective view of the cross-sectional structure in FIG9 ;

[0044] FIG12 is a schematic diagram of a partially enlarged structure of area D in FIG11;

[0045] FIG13 is a schematic diagram of an exploded structure of some parts of a box in a battery pack according to an embodiment of the present application;

[0046] FIG14 is a schematic diagram of the three-dimensional structure of a battery cell in a battery pack according to an embodiment of the present application;

[0047] Figure markings: 100-box; 110-bottom plate; 111-plate; 112-raised portion; 113-exhaust channel; 114-air hole; 115-exhaust hole; 120-top plate; 130-beam; 131-convex channel; 132-pressure relief device; 133-air inlet; 134-air outlet; 140-accommodating chamber; 150-adhesive layer; 160-avoidance space; 200-battery cell; 210-bottom wall; 220-top wall; 230-explosion-proof valve; 240-pole; 250-bus; 260-explosion-proof hole; 300-protective layer; 310-insulating layer; 320-flame retardant and heat-insulating layer.

[0048] Implementation Methods of the Application

[0049] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the embodiments described are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative efforts are within the scope of protection of this application.

[0050] In the description of this application, it should be understood that the terms "length", "width", "thickness", "upper", "lower", "top", "bottom", "inner", "outer", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended only to facilitate the description of this application and simplify the description. They do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as limiting this application. In the description of this application, "plurality" means two or more, and "at least one" means one, two, or more than two, unless otherwise clearly and specifically defined.

[0051] It should also be noted that in the drawings of the embodiments of the present application, arrows marked X, Y, and Z respectively represent a first direction X, a second direction Y, and a third direction Z. The description of the present application introduces the first direction X, the second direction Y, and the third direction Z to more clearly illustrate the structure and relative positional relationships of the components in the battery pack. The first direction X, the second direction Y, and the third direction Z are three relative directions that intersect with each other, rather than absolute directions. In actual applications, the first direction X, the second direction Y, and the third direction Z can point to any direction in space as long as the intersection relationship between the three is maintained. Optionally, the first direction X, the second direction Y, and the third direction Z are perpendicular to each other.

[0052] An embodiment of the present application provides a battery pack that can realize inverted installation of battery cells, thereby avoiding safety hazards above the battery pack and ensuring the stability of battery cell installation.

[0053] Specifically, referring to Figures 1, 2, and 3, the battery pack of the present embodiment includes a housing 100 and battery cells 200. The battery cells 200 are the core components of the battery pack, used to store and release electrical energy, while the housing 100 is the outer shell used to protect and secure the battery cells 200. It provides protection and support for the battery cells 200, while also providing heat insulation, waterproofing, and fire protection, ensuring battery safety.

[0054] In the embodiment of the present application, the housing 100 includes a bottom plate 110 and a top plate 120 disposed opposite each other along a first direction X. The bottom plate 110 includes a plate body 111 and a raised portion 112. The plate body 111 and the raised portion 112 are connected, and the raised portion 112 is disposed to protrude relative to the plate body 111 toward the top plate 120. The housing 100 defines a receiving cavity 140 disposed between the bottom plate 110 and the top plate 120. A battery cell 200 is disposed within the receiving cavity 140. The battery cell 200 includes a bottom wall 210 and a top wall 220 disposed opposite each other along the first direction X. The bottom wall 210 is provided with an explosion-proof valve 230. The bottom wall 210 is disposed toward the bottom plate 110 and connected to the raised portion 112. The top wall 220 is connected to the top plate 120.

[0055] That is, in the battery pack of the embodiment of the present application, the explosion-proof valve 230 of the battery cell 200 faces the bottom plate 110 of the housing 100. Therefore, when thermal runaway occurs, the explosion-proof valve 230 ruptures, discharging high-temperature, high-pressure air toward the bottom plate 110 without impacting the top plate 120, thereby avoiding impacts on the top of the battery pack and reducing safety risks. Furthermore, the raised portion 112 of the bottom plate 110 connects to the bottom wall 210 of the battery cell 200, providing support for the battery cell 200 from below. Simultaneously, the top plate 120 connects to the top wall 220 of the battery cell, thereby working together with the raised portion 112 of the bottom plate 110 to clamp and secure the battery cell 200 between them, further enhancing the installation stability of the battery cell 200.

[0056] Specifically, the battery cell 200 includes a shell, and a storage space is formed inside the shell. The electrode assembly of the battery cell 200 is arranged in the storage space. The bottom wall 210 of the battery cell 200 is a part of the shell, that is, the bottom wall 210 can be any wall of the shell, and the top wall 220 is another wall of the shell arranged opposite the bottom wall 210. The bottom wall 210 and the top wall 220 can be an integral structure, or a detachable structure or a welded fixed structure. In other words, the shell can include a main body and a cover. The main body forms a storage space with an open end. The cover is connected to the main body by a detachable manner or a welding manner and covers the opening. The bottom wall 210 can be the cover part or any wall of the main body. The specific configuration can be made according to actual needs.

[0057] Referring to Figures 2 to 12 , in some embodiments, the raised portion 112 has an exhaust passage 113 and an air hole 114 communicating with the exhaust passage 113 . The air hole 114 is disposed toward the battery cell 200 . Furthermore, the orthographic projection of the explosion-proof valve 230 on the raised portion 112 along the first direction X is at least partially located within the air hole 114 . Therefore, when the explosion-proof valve 230 ruptures, high-temperature, high-pressure gas within the battery cell 200 is discharged externally through the explosion-proof valve 230 . Because the orthographic projection of the explosion-proof valve 230 on the raised portion 112 along the first direction X is at least partially located within the air hole 114 , at least a portion of the high-temperature, high-pressure gas is discharged directly toward the air hole 114 and then rapidly discharged externally through the exhaust passage 113 within the raised portion 112 of the base plate 110 . This allows the gas discharge path to be controlled, preventing any impact on adjacent battery cells 200 and improving safety.

[0058] In an optional embodiment, the number of battery cells 200 is multiple, and the area of ​​the bottom wall 210 of each battery cell 200 is A mm 2The projection area of ​​the protrusion 112 on the bottom wall 210 of each battery cell 200 along the first direction X is B mm 2 , meeting: 0.4≤B / A≤1. Within this ratio range, the battery pack can meet the vibration test and ensure the stability and safety of the internal structure of the battery pack. Please refer to the following test table for details.

[0059] The vibration tests in the above table are conducted in accordance with the 8.2.1 test standard in the national standard GB 38031-2020 Safety requirements for power batteries for electric vehicles.

[0060] After the vibration test, the test is considered to have passed if the following requirements are met:

[0061] (1) No fire, no explosion, no leakage in thermal management, and the battery cell structure is intact;

[0062] (2) The connection is reliable, the structure is intact, there is no shell cracking, and the thermal management function is intact (no debonding);

[0063] (3) Insulation resistance greater than 100Ω / V, leakage current less than 1mA;

[0064] (4) During the test, there is no sharp change in voltage of the minimum monitoring unit (the absolute value of the voltage difference is not greater than 0.15V);

[0065] (5) The airtightness test meets the test requirements;

[0066] (6) After the test, the battery BMS function should be normal, and there should be no errors in the collection of voltage, temperature, etc.

[0067] The vibration test results show that in the ratio range of 0.4≤B / A≤1, the battery pack can meet the vibration test and ensure the stability and safety of the internal structure of the battery pack.

[0068] In one embodiment, the housing 100 has a second direction Y perpendicular to the first direction X. The second direction Y is the extension direction of the exhaust passage 113. The area of ​​the air hole 114 is E mm. 2 The cross-sectional area of ​​the exhaust channel 113 along the second direction Y is F mm 2 , meeting: 2 / 7<E / F<1 / 2; within this ratio range, the battery pack can meet the safety test of GB / T 31467.3-2015. Please refer to the following test table for details.

[0069] The safety test results show that in the ratio range of 2 / 7<E / F<1 / 2, the battery pack can meet the safety test and ensure the exhaust safety when the battery cell 200 inside the battery pack explodes.

[0070] Furthermore, referring to Figure 14 , in some embodiments, an explosion-proof hole 260 is provided through the bottom wall 210. The explosion-proof hole 260 is arranged directly opposite the air hole 114 along the first direction X, and the explosion-proof hole 260 and the air hole 114 are sealed and connected. The explosion-proof valve 230 is sealed to the explosion-proof hole 260. Therefore, when a battery cell 200 experiences thermal runaway and the explosion-proof valve 230 ruptures, high-temperature, high-pressure airflow can be directly ejected toward the air hole 114. The airflow can directly enter the exhaust channel 113 without overflowing from the space between the explosion-proof valve 230 and the air hole 114, thereby preventing it from affecting adjacent battery cells 200 and further improving safety.

[0071] Furthermore, in some embodiments, there are multiple battery cells 200 and multiple air holes 114, and the explosion-proof valve 230 of each battery cell 200 corresponds to one air hole 114. Thus, each battery cell 200 has a corresponding air hole 114 to avoid mutual influence between the battery cells 200. For example, please refer to Figures 2 and 3 together, and multiple battery cells 200 are arranged in an array along the second direction Y and the third direction Z. A plurality of protrusions 112 are provided along the third direction Z, and the protrusions 112 extend along the second direction Y. Each protrusion 112 is provided with a plurality of air holes 114, and the plurality of air holes 114 are arranged at intervals along the second direction Y. In the first direction X, the explosion-proof valve 230 of each battery cell 200 is arranged opposite to a vent 114 , so that when any battery cell 200 experiences thermal runaway, the pressure released by its explosion-proof valve 230 can be discharged from the corresponding vent 114 to avoid affecting other battery cells 200 .

[0072] In some embodiments, the cross-sectional area of ​​the air hole 114 perpendicular to the first direction X is S1, and the cross-sectional area of ​​the explosion-proof hole 260 perpendicular to the first direction X is S2, satisfying the following: S1 ≥ S2. Thus, when the explosion-proof valve 230 is opened, the ejected material can directly enter the air hole 114 without being obstructed, ensuring pressure relief efficiency and improving safety.

[0073] In some embodiments, the exhaust channel 113 extends along the second direction Y, and the cross-sectional area of ​​the exhaust channel 113 perpendicular to the second direction Y is S3, satisfying the condition: S3 ≥ S1. Thus, when the explosion-proof valve 230 is opened, the ejected material from the battery cell 200 can be more effectively channeled and discharged, effectively preventing the valve opening speed from exceeding the discharge speed, thus preventing the accumulation of ejected material and reducing safety hazards.

[0074] Please refer to Figures 2, 3 and 13 together. In some embodiments, the box body 100 also includes a beam body 130, which is connected between the bottom plate 110 and the top plate 120. The beam body 130 is provided with a confluence channel 131 and a pressure relief device 132. The confluence channel 131 has an air inlet 133 and an air outlet 134. The air inlet 133 is connected to the exhaust channel 113, and the pressure relief device 132 is covered with the air outlet 134. The air inlet 133 is arranged on the side of the beam body 130 close to the battery cell 200, and the air outlet 134 is arranged on the side of the beam body 130 away from the battery cell 200. Therefore, when a battery cell 200 experiences thermal runaway, the high-temperature, high-pressure gas discharged from the explosion-proof valve 230 enters the confluence channel 131 through the exhaust channel 113 and is discharged through the pressure relief device 132. Because the pressure relief device 132 is located on the side facing away from the battery cell 200, the high-temperature, high-pressure gas discharged from the pressure relief device 132 will not affect the battery cell 200, thus ensuring safety. Specifically, the beam 130 is formed by connecting multiple plates to form a hollow structure. The confluence channel 131 is a hollow pipe formed inside the beam 130. The beam 130 is fixedly connected to the bottom plate 110 and the plate body 111 of the box body 100. One end of the raised portion 112 is sealed to the beam 130, so that the exhaust channel 113 in the raised portion 112 communicates with the confluence channel 131 in the beam 130.

[0075] Specifically, in some embodiments, the raised portion 112 extends along the second direction Y and has a first end and a second end oppositely disposed along the second direction Y. The first end is sealedly connected to the beam body 130 and is provided with an exhaust hole 115. The beam body 130 is disposed at the first end, and the exhaust hole 115 communicates between the exhaust channel 113 and the air inlet 133. Therefore, airflow entering the exhaust channel 113 can enter the air inlet 133 through the exhaust hole 115, and then enter the converging channel 131 through the air inlet 133, and finally be discharged through the pressure relief device 132. Furthermore, along the third direction Z, the beam body 130 is provided with a plurality of air inlets 133, each air inlet 133 corresponds to a protrusion 112, and is sealed and connected to the exhaust hole 115 on the corresponding protrusion 112, so that the plurality of exhaust channels 113 spaced apart along the third direction Z are all connected to the corresponding air inlets 133, and can all be connected to the confluence channel 131 through the corresponding air inlets 133, and thus the discharged high-temperature and high-pressure airflow can all flow from the confluence channel 131 to the pressure relief device 132, and be discharged through the pressure relief device 132.

[0076] Referring to Figures 2, 11, and 12, in some embodiments, a plurality of battery cells 200 are disposed within the accommodating cavity 140, the plurality of battery cells 200 being arranged in a row along the second direction Y, and a plurality of rows of battery cells 200 are disposed within the accommodating cavity 140 along the third direction Z. The bottom plate 110 includes a plurality of protrusions 112 arranged along the third direction Z, with each protrusion 112 correspondingly connected to a row of battery cells 200. Thus, each module comprising a row of battery cells 200 is supported by its corresponding protrusion 112. In particular, in embodiments in which exhaust passages 113 are disposed within the protrusions 112, when thermal runaway occurs in a battery cell 200 in each row, high-temperature, high-pressure airflow is preferentially exhausted from the corresponding exhaust passage 113, thereby preventing impact on adjacent rows of battery cells 200.

[0077] Referring to Figures 9, 10, 11, and 12, in some embodiments, the raised portion 112 is provided with escape spaces 160 on both sides along the third direction Z. The escape spaces 160 communicate with the accommodating cavity 140. The battery cells 200 include posts 240 disposed on the bottom wall 210. The battery pack also includes a busbar 250 that connects the posts 240 of two adjacent battery cells 200. The posts 240 and busbar 250 are disposed within the escape spaces 160. Forming the escape spaces 160 on both sides of the raised portion 112 allows for the posts 240 and busbar 250 to be avoided, thereby providing space for connecting adjacent battery cells 200. This facilitates series and parallel connection of the battery cells 200, prevents the raised posts 240 and busbar 250 from interfering with the fixation of the battery cells 200, and improves the stability of the battery cell 200 installation. Moreover, by setting the avoidance space 160, on the one hand, the pole 240 and the bus 250 can be avoided, providing space for electrical connection, thereby reducing the space occupied by the battery cell 200 in the first direction X; on the other hand, a bottom impact space is provided for the battery pack, and the bottom impact space, exhaust space and electrical connection space of the battery pack are overlapped together, thereby improving the rationality of the battery pack space utilization.

[0078] Referring again to Figure 12 , in some embodiments, a gap is provided between the post 240 and the plate 111, and the busbar 250 is disposed within the gap. In other words, the gap formed between the post 240 and the plate 111 of the base plate 110 provides ample space for the busbar 250, thereby improving space utilization within the battery pack.

[0079] It should be noted that in the above embodiment, the explosion-proof valve 230 and the pole 240 of the battery cell 200 are both arranged on the bottom wall 210, that is, the battery cell 200 is completely inverted. In this solution, the top wall 220 of the battery cell 200 is connected to the top plate 120 of the box body 100 by means of an adhesive connection. The adhesive connection method itself has a certain fixing effect, but as the use time passes or the temperature of the battery pack changes, the reliability of the adhesive connection will decrease. In the embodiment of the present application, due to the provision of the raised portion 112, a fixing effect can be provided at the bottom of the battery cell 200, reducing the reliance on the top connection, reducing the probability of failure, and improving the reliability of the battery and extending the service life.

[0080] 2 and 3 , in some embodiments, the battery pack further includes a protective layer 300 connected between the bottom wall 210 and the raised portion 112. The protective layer 300 is used to further protect the battery pack and enhance the safety of the battery pack.

[0081] The protective layer 300 can be a single-layer structure. For example, the protective layer 300 can be a flame-retardant insulation layer, such as a mica board or a spray coating, which can provide further protection against thermal runaway. Because when the explosion-proof valve 230 erupts, the temperature of the reactants is extremely high. Providing a flame-retardant insulation layer as the protective layer 300 can prevent the excessive temperature from affecting the surrounding materials, avoid ignition and fire, and further reduce the risk of safety accidents. For example, the protective layer 300 can also be an insulating layer. The insulating layer can provide electrical insulation protection, eliminating the problems of electrical clearance and creepage distance, while preventing the occurrence of short circuit problems caused by insulation failure, thereby affecting the electrical safety of the entire package. It should be noted that the battery cell 200 is often provided with insulation protection measures, such as an external insulating blue film, an insulating top cover, etc. However, since the battery cell 200 needs to be clamped under force, insulation damage may occur during use. Therefore, providing an insulating layer as the protective layer 300 can further improve its insulation protection performance.

[0082] Of course, the protective layer 300 can be a multi-layer laminated structure. That is, for example, the flame retardant and heat-insulating layers and the insulating layer can be combined, i.e., a layer can be provided between the two. Of course, a single protective layer 300 can also be provided that has both insulating and heat-insulating flame retardant functions.

[0083] In addition, the protective layer 300 may also include an adhesive layer to further secure the connection between the battery cell 200 and the bottom plate 110. Furthermore, an adhesive layer 150 may be provided between the battery cell 200 and the top plate 120 to strengthen the connection between the top plate 120 and the battery cell 200 and enhance the installation stability of the battery cell 200.

[0084] Accordingly, an embodiment of the present application provides an electrical device, which can be various types of equipment such as new energy vehicles, computers, energy storage and power supply devices, etc. It can be 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.

[0085] In the above embodiments, the description of each embodiment has its own focus. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0086] The above is a detailed introduction to the battery pack and electrical equipment provided in the embodiments of the present application, and specific examples are used to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the technical solutions and core ideas of the present application; ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery pack, wherein: include: A box body, the box body has a first direction, the box body comprises a bottom plate and a top plate arranged opposite to each other along the first direction, the bottom plate comprises a plate body and a protrusion connected to each other, the protrusion protrudes toward the top plate relative to the plate body, the box body has a receiving cavity, and the receiving cavity is arranged between the bottom plate and the top plate; A battery cell, the battery cell is arranged in the accommodating cavity, the battery cell comprises a bottom wall and a top wall arranged opposite to each other along the first direction, the bottom wall is provided with an explosion-proof valve, the bottom wall is arranged toward the bottom plate and connected to the protruding portion, and the top wall is connected to the top plate; The convex portion has an exhaust channel and an air hole connected to the exhaust channel, and the air hole is arranged toward the battery cell; An orthographic projection of the explosion-proof valve on the protruding portion along the first direction is at least partially located within the air hole.

2. The battery pack according to claim 1, wherein: The number of the battery cells is multiple, and the area of ​​the bottom wall of each battery cell is A mm 2 The projection area of ​​the protrusion along the first direction on the bottom wall of each battery cell is B mm 2 , satisfying: 0.4≤B / A≤1.

3. The battery pack according to claim 1, wherein: The box body has a second direction perpendicular to the first direction, the second direction is the extension direction of the exhaust channel, and the hole area of ​​the air hole is E mm 2 The cross-sectional area of ​​the exhaust passage along the second direction is F mm 2 , satisfying: 2 / 7<E / F<1 / 2.

4. The battery pack according to claim 1, wherein: The bottom wall has an explosion-proof hole, the explosion-proof hole is directly opposite to the air hole along the first direction, and the explosion-proof hole is sealed and connected to the air hole, and the explosion-proof valve cover is sealed on the explosion-proof hole.

5. The battery pack according to claim 4, wherein: The battery cells and the air holes are both provided in plurality, and the explosion-proof valve of one battery cell corresponds to one air hole.

6. The battery pack according to claim 1, wherein: The box also includes: The beam body is connected between the bottom plate and the top plate, the beam body is provided with a confluence channel and a pressure relief device, the confluence channel has an air inlet and an air outlet, the air inlet is connected to the exhaust channel, the pressure relief device is sealed at the air outlet, the air inlet is arranged on the side of the beam body close to the battery cell, and the air outlet is arranged on the beam body. The battery body is away from the side of the battery cell.

7. The battery pack according to claim 6, wherein: The protrusion extends along a second direction intersecting the first direction, and the protrusion has a first end and a second end oppositely disposed along the second direction, and the first end is provided with an exhaust hole; The beam body is arranged at the first end, and the exhaust hole is communicated between the exhaust channel and the air inlet.

8. The battery pack according to any one of claims 1 to 7, wherein: A plurality of battery cells are arranged in the accommodating cavity, and the plurality of battery cells are arranged in a row along a second direction, and a plurality of rows of battery cells are arranged in the accommodating cavity along a third direction, and the first direction, the second direction, and the third direction intersect; The bottom plate includes a plurality of the protrusions, the plurality of the protrusions are arranged along the third direction, and one of the protrusions is correspondingly connected to a row of the battery cells.

9. The battery pack according to claim 8, wherein: The protruding portion is provided with avoidance spaces on both sides along the third direction, and the avoidance spaces are connected to the accommodating cavity; The battery cell includes a pole arranged on the bottom wall, and the battery pack also includes a bus bar, which connects the poles of two adjacent battery cells, and the poles and the bus bar are arranged in the avoidance space.

10. The battery pack according to claim 9, wherein: There is a gap between the pole and the plate body, and the busbar is arranged in the gap.

11. The battery pack according to claim 8, wherein: The battery pack further comprises: A protective layer is connected between the bottom wall and the protruding portion.

12. The battery pack according to claim 11, wherein: The protective layer comprises: A flame retardant heat insulating layer is configured to provide heat insulation and flame retardancy between the bottom wall and the raised portion.

13. The battery pack according to claim 11, wherein: The protective layer comprises: An insulating layer is configured to provide insulation protection between the bottom wall and the protruding portion.

14. The battery pack according to claim 11, wherein: The protective layer comprises: The adhesive layer is configured to bond the battery cell and the bottom plate.

15. An electrical device, wherein: A battery pack comprising any one of claims 1 to 14.

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