Battery pack and electric device

Abstract

The utility model discloses a battery pack and an electric device, relates to the technical field of battery packs, and is used for solving the problem that a series of in-pack heat diffusion can be caused to cause battery failure when thermal runaway occurs in an existing battery cell. The battery pack provided by the utility model has a first direction, the battery pack comprises a bottom cover, the bottom cover comprises a bottom plate and a side plate, the side plate is connected to one side of the bottom plate in the first direction, and an accommodating cavity is defined by the side plate and the bottom plate; the battery cell is arranged in the accommodating cavity; wherein the bottom plate is provided with an exhaust channel, the side plate is provided with a through side exhaust port, and the exhaust channel and the side exhaust port can be communicated with the containing cavity and the outside of the bottom cover. The device is used for discharging high-temperature and high-pressure gas generated by thermal runaway of the battery cell to the outside of the bottom cover.

Description

TECHNICAL FIELD

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

[0002] In recent years, the emergence of new energy vehicles has played a huge role in promoting social development and environmental protection. As a rechargeable battery, a power battery is a power source of a new energy vehicle and is widely used in the field of new energy vehicles.

[0003] With the development of new energy vehicles, the safety performance requirements of the power battery are becoming higher and higher, and more and more enterprises develop battery safety and thermal diffusion protection as core technology. When the battery cell is in thermal runaway, a large amount of high-temperature and high-pressure gas is generated, causing the internal pressure of the battery pack to become larger and larger. Moreover, the high-temperature and high-pressure gas has a large amount of heat, which is easy to cause thermal runaway of other battery cells in the pack, and then a series of thermal diffusion in the pack is caused, resulting in battery failure. CONTENT OF THE UTILITY MODEL

[0004] The present application provides a battery pack and an electric device, which can solve the problem that a series of thermal diffusion in the pack is caused when the existing battery cell is in thermal runaway, and then the battery fails.

[0005] To achieve the above purpose, on the one hand, the battery pack provided by the present application has a first direction, and the battery pack comprises:

[0006] a bottom cover comprising a bottom plate and a side plate, the side plate being connected to one side of the bottom plate in the first direction and enclosing the bottom plate to form an accommodating cavity;

[0007] a battery cell arranged in the accommodating cavity;

[0008] wherein the bottom plate is provided with an exhaust passage, and the side plate is provided with a through side exhaust port, and the exhaust passage and the side exhaust port can communicate the accommodating cavity and the outside of the bottom cover.

[0009] In some embodiments of the present application,

[0010] a first sealing structure is arranged in the exhaust passage or at the end of the exhaust passage, and the first sealing structure has a first sealing thickness D1 mm in the exhaust direction of the exhaust passage;

[0011] a second sealing structure is arranged in the side exhaust port or at the end of the side exhaust port, and the second sealing structure has a second sealing thickness D2 mm in the exhaust direction of the side exhaust port, and satisfies D1>D2.

[0012] In some embodiments of the application, the battery pack has the first direction and the second direction intersecting, the bottom plate has an outer side facing away from the battery cell, the first sealing structure is a sealing plate connected to the outer side, the exhaust passage has an exhaust port located on the outer side, at least part of the sealing plate shields the exhaust port, the side plate is connected to at least one side of the bottom plate in the second direction, the second sealing structure is a weak area provided on the side plate, and the part of the sealing plate covering the exhaust port has the first sealing thickness D1 mm, and the side plate has the second sealing thickness D2 mm at the weak area.

[0013] In some embodiments of the application, the sealing plate comprises a connecting area and a sealing area, the connecting area is annularly arranged at the outer periphery of the sealing area and connected to the outer side, and the sealing area covers the exhaust port, and a first annular notch is provided on the side of the sealing area close to the connecting area.

[0014] In some embodiments of the application, the battery pack has the first direction and the second direction intersecting, the bottom plate has an outer side facing away from the battery cell, the first sealing structure is a sealing plate connected to the outer side, the exhaust passage has an exhaust port located on the outer side, at least part of the sealing plate shields the exhaust port, the side plate is connected to at least one side of the bottom plate in the second direction, the second sealing structure is a weak area provided on the side plate, and the part of the sealing plate covering the exhaust port has the first sealing thickness D1 mm, and the side plate has the second sealing thickness D2 mm at the weak area.

[0015] In some embodiments of the application, the bottom plate has an inner side facing the battery cell, the exhaust passage has an air inlet port, the air inlet port is located on the inner side, the battery cell has a first side facing the bottom plate, the first side is provided with a pressure relief valve, and a projection area of the pressure relief valve on the bottom plate overlaps at least part of the air inlet port.

[0016] In some embodiments of the application, the bottom plate has an outer side and an inner side facing in the first direction, the exhaust passage has an air inlet port and an exhaust port, the air inlet port is located on the inner side, the exhaust port is located on the outer side, and at least part of the projection area of the air inlet port on the outer side is located outside the exhaust port.

[0017] In some embodiments of the application, the battery pack has the first direction and the third direction intersecting with each other, the air inlet port has a first size L1 mm in the third direction, the exhaust port has a second size L2 mm in the third direction, and L1 > L2 is satisfied.

[0018] In some embodiments of the application, the battery pack has the first direction, the second direction and the third direction intersecting with each other two by two, the battery cell has a first side facing the bottom plate, the bottom plate has a plurality of support bosses on a side facing the first side, the plurality of support bosses are arranged in the third direction, and the first side is supported on two adjacent support bosses.

[0019] In some embodiments of the application, a plurality of battery cells are arranged in the third direction, and at least one support boss supports two battery cells adjacent in the third direction.

[0020] In some embodiments of the application, the bottom plate is connected with a side plate on each side in the second direction, each support boss extends in the second direction and is connected with a corresponding side plate at both ends thereof, and at least one side exhaust port is arranged between each two adjacent support bosses.

[0021] In some embodiments of the application, a plurality of battery cells are arranged in the second direction, and each support boss extends in the second direction to simultaneously support all battery cells in the second direction.

[0022] The bottom plate is provided with a plurality of exhaust channels, and the plurality of exhaust channels are arranged between two adjacent support bosses and correspond to a plurality of battery cells.

[0023] In some embodiments of the application, the bottom plate has an outer side opposite the battery cell, the exhaust channel includes a plurality of sub-channels and at least one collection channel, the plurality of sub-channels are arranged in the second direction, at least part of the sub-channels communicate with the same collection channel, the collection channel extends in the second direction and has an exhaust port opposite the sub-channels, and the exhaust port is located on the outer side.

[0024] In some embodiments of the application, the exhaust channel is truncated along a reference plane perpendicular to the second direction, and the cross-sectional shape of the collection channel is arranged obliquely relative to the first direction.

[0025] In some embodiments of the application, the battery pack has the first direction, the second direction and the third direction intersecting with each other two by two, the bottom plate is connected with a side plate on each side in the second direction, and each side plate is provided with a side exhaust port penetrating in the second direction.

[0026] The bottom plate has an outer side face facing away from the battery cell, and a current collecting piece is connected to the outer side face. The current collecting piece comprises a protruding part and a groove part which are alternately arranged in sequence along the third direction. The protruding part is connected to the bottom plate, so that the groove part and the outer side face are connected to form a current collecting channel. The current collecting channel penetrates along the second direction. The exhaust passage has an exhaust port located on the outer side face, and the exhaust port is in communication with the current collecting channel.

[0027] In another aspect, the application also provides a battery pack for a use electric device, which comprises the battery pack as described in any of the above technical solutions.

[0028] The above technical solutions of the application have at least the following beneficial effects: the exhaust passage is arranged on the bottom plate, and the side exhaust port is arranged on the side plate. By arranging multiple exhaust paths, the high-temperature and high-pressure gas generated when the battery cell is in thermal runaway can be quickly discharged to the outside of the bottom cover, so that the pressure inside the battery pack can be quickly reduced. Therefore, the above arrangement can avoid the problem that the high-temperature and high-pressure gas causes other battery cells in the battery pack to be in thermal runaway, thereby improving the working efficiency and service life of the battery pack. BRIEF DESCRIPTION OF DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative effort.

[0030] Figure 1 is a perspective view of a battery pack in the embodiments of the application;

[0031] Figure 2 is one of the perspective views of a bottom cover in the battery pack in the embodiments of the application;

[0032] Figure 3 is another perspective view of the bottom cover in the battery pack in the embodiments of the application;

[0033] Figure 4 is a sectional view of the battery pack along the third direction X in the embodiments of the application;

[0034] Figure 5 is an enlarged view of part A in Figure 4 ;

[0035] Figure 6 is a sectional view of the battery pack along the second direction Y in the embodiments of the application;

[0036] Figure 7 is an enlarged view of part C in Figure 6 ;

[0037] Figure 8 is Figure 5 is an enlarged view of part B in Fig.

[0038] The main reference signs in the drawings that accompany the present application specification are explained below:

[0039] 1-bottom cover; 11-bottom plate; 111-exhaust passage; 1111-inlet port; 1112-exhaust port; 1113-sub passage; 1114-converging passage; 112-first sealing structure; 1121-connection area; 1122-sealing area; 1123-first annular score; 113-outer side surface; 114-inner side surface; 115-support boss; 12-side plate; 121-side exhaust port; 122-second sealing structure; 1221-second annular score; 13-accommodation cavity;

[0040] 2-battery cell; 21-first side part; 211-explosion-proof valve;

[0041] 3-current collector; 31-protruding part; 32-groove part; 33-current collection passage;

[0042] D1-first sealing thickness; D2-second sealing thickness; L1-first dimension; L2-second dimension; Z-first direction; Y-second direction; X-third direction. DETAILED DESCRIPTION

[0043] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0044] In the description of the present application, it should be understood that the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0045] The terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second", etc. can explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise stated, the meaning of "multiple" is two or more.

[0046] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting" should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, it can be direct connection, or indirect connection through intermediate medium, it can be internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0047] The present application provides a battery pack and an electric device, which are described in detail below. It should be noted that the order of the following embodiments is not limited as the preferred order of the embodiments of the present application. Moreover, in the following embodiments, the description of each embodiment has its own emphasis, and the parts not described in detail in a certain embodiment can be referred to the related description of other embodiments.

[0048] Referring to Figure 1 and Figure 2 The battery pack provided by the present application has a first direction Z, a second direction Y and a third direction X intersecting with each other, and the battery pack comprises a bottom cover 1 and a battery cell 2. The bottom cover 1 comprises a bottom plate 11 and a side plate 12, the side plate 12 is connected to one side of the bottom plate 11 in the first direction Z and forms an accommodating cavity 13 together with the bottom plate 11. The battery cell 2 is arranged in the accommodating cavity 13. Among them, the bottom plate 11 is provided with an exhaust passage 111, and the side plate 12 is provided with a through side exhaust port 121. The exhaust passage 111 and the side exhaust port 121 can communicate the accommodating cavity 13 and the outside of the bottom cover 1.

[0049] In this technical solution, the present application is provided with the exhaust passage 111 on the bottom plate 11 and the side exhaust port 121 on the side plate 12, by arranging multiple exhaust paths, the large amount of high-temperature and high-pressure gas generated when the battery cell 2 occurs thermal runaway can be quickly discharged to the outside of the bottom cover 1, which can quickly reduce the pressure inside the battery pack. Therefore, the above arrangement can avoid the problem that the high-temperature and high-pressure gas causes other battery cells in the battery pack to generate thermal runaway and leads to the failure of the battery pack, thereby facilitating to improve the working efficiency and service life of the battery pack.

[0050] For example, the above-mentioned bottom cover 1 has a rectangular box-shaped structure. In some embodiments, the above-mentioned battery pack further comprises a top cover, the top cover and the bottom cover 1 are covered together along the first direction Z to form a sealed cavity structure, a part of the space of the cavity structure is defined by the accommodating cavity 13 in the bottom cover 1, and another part of the space of the cavity structure is defined by the top cover. Among them, the top cover and the bottom cover 1 can be fixedly connected together by clamping or threaded connection.

[0051] Specifically, the side plates 12 are four in number, two of the four side plates 12 being connected to opposite sides of the bottom plate 11 in the second direction Y, and the other two of the four side plates 12 being connected to opposite sides of the bottom plate 11 in the third direction X.

[0052] In combination Figures 3-7 , specifically refer to Figure 5 and Figure 7 , the first sealing structure 112 is provided in the exhaust passage 111 or at the end of the exhaust passage 111. The first sealing structure 112 has a first sealing thickness D1 mm in the exhaust direction of the exhaust passage 111. The second sealing structure 122 is provided in the side exhaust port 121 or at the end of the side exhaust port 121, and has a second sealing thickness D2 mm in the exhaust direction of the side exhaust port 121, and satisfies D1>D2. Through the above arrangement, different exhaust modes are designed for the severity of thermal runaway in the battery pack. That is, different exhaust structures are set according to different pressure levels to achieve graded exhaust of the battery pack, so that the gas can be discharged step by step, thereby effectively controlling the internal pressure of the battery pack and reducing the safety risk. Moreover, the first sealing structure 112 and the second sealing structure 122 can form a barrier to prevent external substances from entering the bottom cover 1.

[0053] Specifically, the first sealing thickness D1 of the first sealing structure 112 is greater than the second sealing thickness D2 of the second sealing structure 122, in other words, the gas pressure required to break the second sealing structure 122 is less than the gas pressure required to break the first sealing structure 112. Therefore, when thermal runaway occurs in one cell 2 in the battery pack, the explosion-proof valve 211 of the cell 2 is opened, and the amount of gas is small at the initial stage of the exhaust of the explosion-proof valve 211, so that the gas will only break through the second sealing structure 122 and be discharged to the outside of the bottom shell 1 through the side exhaust port 121. When thermal runaway occurs in multiple cells 2 in the battery pack, the instantaneous gas pressure in the battery pack is very high, at which time the gas will break through the first sealing structure 112 and be discharged to the outside of the bottom shell 1 through the exhaust passage 111.

[0054] Based on the above embodiments, as Figure 3 , Figure 5 and Figure 7As shown, the bottom plate 11 has an outer side surface 113 facing away from the battery cell 2, and the exhaust passage 111 has an exhaust port 1112 located on the outer side surface 113. The first sealing structure 112 is a sealing plate connected to the outer side surface 113, and at least part of the sealing plate covers the exhaust port 1112. The side plate 12 is connected to at least one side of the bottom plate 11 in the second direction Y, and the second sealing structure 122 is a weak area provided on the side plate 12. The part of the sealing plate covering the exhaust port 1112 has a first sealing thickness D1 mm, and the side plate 12 has a second sealing thickness D2 mm at the weak area. Through the above arrangement, it is ensured that the manufacturing process of the first sealing structure 112 and the second sealing structure 122 is relatively simple, and thus easy to implement.

[0055] For embodiments that include both "the first sealing structure 112 is a sealing plate connected to the outer side surface 113, and at least part of the sealing plate covers the exhaust port 1112" and "a plurality of battery cells 2 are arranged in the second direction Y, and a plurality of exhaust passages 111 are provided on the bottom plate 11, and the plurality of exhaust passages 111 are arranged corresponding to the plurality of battery cells 2", the plurality of exhaust passages 111 arranged in sequence in the second direction Y can be sealed by one sealing plate, thereby facilitating the manufacturing difficulty and assembly difficulty of the above-mentioned first sealing structure 112.

[0056] Of course, without considering the manufacturing difficulty, the above-mentioned first sealing structure 112 can also be a weak area provided on the bottom plate 11, and the second sealing structure 122 is a sealing plate provided on the side plate 12, which is provided on the outer side surface or the inner side surface of the side plate 12.

[0057] Specifically, as shown, Figure 8 The sealing plate includes a connecting area 1121 and a sealing area 1122. The connecting area 1121 is annularly provided on the outer periphery of the sealing area 1122 and is connected to the outer side surface 113. The sealing area 1122 covers the exhaust port 1112, and the side of the sealing area 1122 close to the connecting area 1121 is provided with a first annular notch 1123. The edge of the weak area is provided with a second annular notch 1221. The application can further reduce the connection strength of the sealing plate at this position by providing the first annular notch 1123, and further reduce the connection strength of the weak area at this position by providing the second annular notch 1221, thereby facilitating the deformation or fracture of the sealing plate and the weak area at the corresponding notch position when the air pressure in the battery pack is too large, so as to realize the communication between the accommodating cavity 13 and the outside of the bottom cover 1. In some embodiments, the above-mentioned connecting area 1121 and the outer side surface 113 are welded together.

[0058] Meanwhile, please continue to refer to Figure 2In order to further optimize the exhaust effect on the bottom cover 1, the bottom plate 11 is connected with a side plate 12 on each of the opposite sides in the second direction Y, and each side plate 12 is provided with a weak area. The weak areas on the two side plates 12 are opposite each other in the second direction Y. Through the opposite weak areas on the two side plates 12, the structural balance of the battery pack in the second direction Y can be achieved, which helps to disperse and balance the stress and load of the battery pack during use, reduces uneven deformation and damage of the structure, and improves the stability and reliability of the battery pack.

[0059] Please continue to refer to Figure 4 and 5 The bottom plate 11 has an inner side 114 facing the battery cell 2, and the exhaust passage 111 has an air inlet port 1111 located on the inner side 114. The battery cell 2 has a first side 21 facing the bottom plate 11, and the first side 21 is provided with a pressure relief valve 211. The projection area of the pressure relief valve 211 on the bottom plate 11 overlaps at least part of the air inlet port 1111. The presence of the pressure relief valve 211 can release gas when the internal pressure of the battery cell 2 is too high, to prevent safety problems such as battery swelling, rupture or explosion. Further, by overlapping the pressure relief valve 211 with at least part of the air inlet port 1111, the gas released by the battery cell 2 through the pressure relief valve 211 can be directly discharged from the battery pack through the corresponding air inlet port 1111, avoiding the accumulation of gas inside the battery, improving the exhaust efficiency, and further enhancing the safety of the battery pack.

[0060] In addition, the bottom plate 11 has an outer side 113 and an inner side 114 opposite each other in the first direction Z, and the exhaust passage 111 has an air inlet port 1111 and an exhaust port 1112. The air inlet port 1111 is located on the inner side 114, and the exhaust port 1112 is located on the outer side 113. The projection area of at least part of the air inlet port 1111 on the outer side 113 is located outside the exhaust port 1112. In other words, the above-mentioned exhaust passage 111 is not through the bottom plate 11 along the first direction Z, but at least part or all of its extension path is inclined relative to the first direction Z, so that the projection area of at least part of the air inlet port 1111 on the outer side 113 is located outside the exhaust port 1112.

[0061] In this way, the length of the exhaust path of the exhaust passage 111 can be increased, and the gas can be more fully diffused and flowed during the exhaust process, which helps to speed up the exhaust speed of the gas and improve the exhaust efficiency.

[0062] Based on the above embodiment, the air inlet port 1111 has a first size L1 mm in the third direction X, the air outlet port 1112 has a second size L2 mm in the third direction X, and L1 > L2 is satisfied. In this way, the flow area at the air outlet port 1112 can be ensured to be smaller than the flow area of the air inlet port 1111, so as to accelerate the flow speed and pressure of the gas, and facilitate the gas to break through the first sealing structure 112 and be discharged from the bottom cover 1 in time.

[0063] In some embodiments, the projection area of the explosion-proof valve 211 on the bottom plate 11 is located within the area enclosed by the air inlet port 1111, and is located directly below the explosion-proof valve 211. In this way, the gas discharged through the explosion-proof valve 211 can flow quickly into the exhaust passage 111, which is beneficial to shorten the gathering time of high-temperature and high-pressure gas in the bottom cover 1, thereby improving the exhaust efficiency.

[0064] In some embodiments of the present application, the battery cell 2 has a first side 21 facing the bottom plate 11. The bottom plate 11 has a plurality of support bosses 115 on one side facing the first side 21, and the first side 21 is supported on two adjacent support bosses 115. In the first direction Z, the side exhaust port 121 is closer to the bottom plate 11 relative to the first side 21. In other words, the first side 21 of the present application is supported on two adjacent support bosses 115, so that the first side 21 and the bottom plate 11 are not in contact and there is a certain gap between them, which is the height of the support boss 115 in the first direction Z. The first side 21, the two adjacent support bosses 115 in the first direction Z, and the part of the bottom plate 11 between the two adjacent support bosses 115 enclose a cavity, and the side exhaust port 121 and the exhaust passage 111 can communicate the cavity with the outside of the bottom cover 1.

[0065] In this way, by providing the support boss 115, on the one hand, it can avoid the bottom plate 11 of the bottom cover 1 from being damaged by the impact force from the bottom to the top when the components (such as the explosion-proof valve 211) installed on the first side 21 are damaged. On the other hand, it can also increase the exhaust space so that the gas can diffuse and flow more fully during the exhaust process, which helps to accelerate the exhaust speed of the gas and improve the exhaust efficiency.

[0066] Furthermore, the presence of the support boss 115 can increase the gap between the battery cell 2 and the bottom plate 11, promote air circulation, help improve the heat dissipation effect of the battery pack, effectively reduce the temperature of the battery cell 2, and thus prolong the service life of the battery pack and improve its performance and safety.

[0067] In some embodiments, the bottom plate 11, the side plate 12, and the support boss 115 are of an integrated structure.

[0068] In order to simplify the arrangement of the support bosses 115, a plurality of battery cells 2 are arranged in the third direction X, and at least one support boss 115 supports two battery cells 2 adjacent in the third direction X.

[0069] Please continue to refer to Figure 2 The bottom plate 11 is connected with a side plate 12 on each of the opposite sides in the second direction Y, each support boss 115 extends in the second direction Y, and its two ends are connected with the corresponding side plate 12, and at least one side exhaust port 121 is arranged between each two adjacent support bosses 115, so that the support boss 115 can enhance the structural stability and structural strength of the bottom cover 1 to a certain extent. When the battery pack is subjected to external impact or vibration, the support boss 115 can bear part of the stress and reduce the load of the battery cell 2, preventing the battery cell 2 from being damaged.

[0070] Please refer to Figure 1 and Figure 2 A plurality of battery cells 2 are arranged in the second direction Y, and each support boss 115 extends in the second direction Y to support all battery cells 2 in the second direction Y. The bottom plate 11 is provided with a plurality of exhaust channels 111, and the plurality of exhaust channels 111 are located between the adjacent two support bosses 115 and are arranged correspondingly with the plurality of battery cells 2, so as to ensure that each battery cell 2 has a corresponding exhaust channel 111. The plurality of exhaust channels 111 can provide multiple gas discharge paths to ensure that each battery cell 2 has a corresponding exhaust channel 111 to discharge gas in time, thereby reducing the gas pressure inside the battery pack and reducing the potential impact on the battery cell 2 and other components, which helps to maintain the balance of the gas pressure inside the battery pack and maintain the stability and safety of the battery pack.

[0071] Based on the above embodiment, the bottom plate 11 has an outer side 113 facing away from the battery cell 2, and the exhaust channel 111 includes a plurality of sub-channels 1113 and at least one collection channel 1114. The plurality of sub-channels 1113 are arranged at intervals in the second direction Y and do not penetrate the bottom plate 11. At least part of the sub-channels 1113 communicate with the same collection channel 1114, the collection channel 1114 extends in the second direction Y and has an exhaust port 1112 facing away from the sub-channel 1113, and the exhaust port 1112 is located on the outer side 113, so that fewer collection channels 1114 can be made relative to the number of sub-channels 1113 to simplify the manufacturing difficulty of the collection channel 1114.

[0072] It should be noted that the present application Figure 2 and Figure 3Only an embodiment in which a plurality of sub-paths 1113 spaced apart in the second direction Y are communicated by one collection path 1114 is shown in the drawings. Of course, in other embodiments not shown in the drawings, two collection paths 1114 can be provided, a part of the plurality of sub-paths 1113 are communicated with one of the two collection paths 1114, and another part of the plurality of sub-paths 1113 are communicated with the other of the two collection paths 1114.

[0073] For example, as shown in Figure 5 The cross-sectional shape of the collection path 1114 is inclined with respect to the first direction Z when the exhaust path 111 is truncated along a reference plane perpendicular to the second direction Y. The collection path 1114 is linear and is inclined with respect to the first direction Z to increase the exhaust path length of the exhaust path 111. Of course, in other embodiments, the collection path 1114 can also be S-shaped and meandering. In the present application, it is only required that the extension direction of the collection path 1114 is different from the extension direction of the sub-path 1113.

[0074] In some embodiments of the present application, with reference to Figure 2 and Figure 4 The bottom plate 11 is connected with one side plate 12 on each of the opposite sides in the second direction Y, and each side plate 12 is provided with a side exhaust port 121 penetrating in the second direction Y. The bottom plate 11 has an outer side surface 113 facing away from the battery cell 2. The outer side surface 113 is connected with a current collecting member 3 including protruding portions 31 and recessed portions 32 alternately arranged in the third direction X. The protruding portions 31 are connected with the bottom plate 11, so that the recessed portions 32 and the outer side surface 113 are connected to form a current collecting path 33 penetrating in the second direction Y. The exhaust path 111 has an exhaust port 1112 located at the outer side surface 113, and the exhaust port 1112 is communicated with the current collecting path 33.

[0075] In other words, the side exhaust port 121 and the current collecting path 33 described above both extend and penetrate in the second direction Y. Thus, the exhaust direction of the side plate 12 and the exhaust direction of the bottom plate 11 are kept consistent, which facilitates the unified management of the exhaust of the battery pack. In addition, the current collecting member 3 is connected with the outer side surface 113, the current collecting member 3 includes protruding portions 31 and recessed portions 32 alternately arranged in the third direction X, which can also be used to protect the exhaust port 1112 from damage due to foreign object invasion. At the same time, the bottom of the bottom plate 11 can also be protected from impact.

[0076] In some embodiments of the present application, the present application also provides a power-using device comprising the battery pack as claimed in any of the above technical solutions, and the battery pack is used to supply power to the power-using device. Since the battery pack in the power-using device provided by the present application and the above-mentioned battery pack have the same structure, both can solve the same technical problems and achieve the same technical effects.

[0077] In the description of the present specification, specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in a suitable manner.

[0078] The above is merely specific implementation of the present application, but the protection scope of the present application is not limited thereto, any person skilled in the art can easily think of changes or replacements within the technical scope disclosed by the present application, which should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims. In addition, the present specification applies specific examples to describe the principles and implementation of the present application, and the above examples are only used to help understand the method and core idea of the present application, and the content of the present specification should not be understood as a limitation of the present application.

Claims

1. A battery pack, characterized in that, The battery pack has a first orientation, and the battery pack includes: The bottom cover includes a bottom plate and a side plate, wherein the side plate is connected to one side of the bottom plate in the first direction and surrounds it to form a receiving cavity; The battery cell is disposed within the receiving cavity; The bottom plate is provided with an exhaust channel, and the side plate is provided with a through side exhaust port. Both the exhaust channel and the side exhaust port can connect to the outside of the receiving cavity and the bottom cover.

2. The battery pack according to claim 1, characterized in that, A first sealing structure is provided inside the exhaust channel or at the end of the exhaust channel, and the first sealing structure has a first sealing thickness D1mm along the exhaust direction of the exhaust channel; A second sealing structure is provided inside the side exhaust port or at the end of the side exhaust port. Along the exhaust direction of the side exhaust port, the second sealing structure has a second sealing thickness D2mm and satisfies: D1>D2.

3. The battery pack according to claim 2, characterized in that, The battery pack has intersecting first and second directions. The base plate has an outer side facing away from the battery cell. The first sealing structure is a sealing plate connected to the outer side. The exhaust channel has an exhaust port located on the outer side. At least a portion of the sealing plate covers the exhaust port. The side plate is connected to at least one side of the base plate in the second direction. The second sealing structure is a weak area provided on the side plate. The portion of the sealing plate covering the exhaust port has a first sealing thickness D1 mm. The side plate has a second sealing thickness D2 mm in the weak area.

4. The battery pack according to claim 3, characterized in that, The sealing plate includes a connecting area and a sealing area. The connecting area is arranged around the outer periphery of the sealing area and connected to the outer side. The sealing area covers the exhaust port. The sealing area has a first annular groove on the side near the connecting area and a second annular groove at the edge of the weak area.

5. The battery pack according to claim 3, characterized in that, The battery pack has intersecting first and second directions. The base plate is connected to a side plate on each of its opposite sides in the second direction. Each side plate is provided with a weak area. In the second direction, the weak areas on the two side plates are arranged opposite to each other.

6. The battery pack according to any one of claims 1 to 5, characterized in that, The base plate has an inner side facing the battery cell, the exhaust channel has an air inlet port located on the inner side, the battery cell has a first side facing the base plate, the first side is provided with an explosion-proof valve, and the orthogonal projection area of ​​the explosion-proof valve on the base plate coincides with at least part of the air inlet port.

7. The battery pack according to claim 1, characterized in that, The base plate has an outer side and an inner side that are opposite to each other in the first direction. The exhaust channel has an air inlet port and an exhaust port. The air inlet port is located on the inner side, and the exhaust port is located on the outer side. At least a portion of the orthographic projection area of ​​the air inlet port on the outer side is located outside the exhaust port.

8. The battery pack according to claim 7, characterized in that, The battery pack has a first direction and a third direction that intersect each other in pairs. The air intake port has a first dimension L1mm in the third direction, and the exhaust port has a second dimension L2mm in the third direction, satisfying that: L1>L2.

9. The battery pack according to claim 1 or 7, characterized in that, The battery pack has a first direction, a second direction, and a third direction that intersect each other in pairs. The battery cell has a first side facing the base plate. The base plate has a plurality of support protrusions on the side facing the first side. The plurality of support protrusions are arranged at intervals along the third direction. The first side is supported on two adjacent support protrusions. In the first direction, the side exhaust port is close to the base plate relative to the first side.

10. The battery pack according to claim 9, characterized in that, A plurality of said battery cells are arranged along the third direction, and at least one of said support bosses simultaneously supports two battery cells adjacent to each other in the third direction.

11. The battery pack according to claim 9, characterized in that, The base plate is connected to a side plate on each of its opposite sides in the second direction. Each support boss extends along the second direction and its two ends are respectively connected to the corresponding side plate. At least one side exhaust port is provided between each two adjacent support bosses.

12. The battery pack according to claim 9, characterized in that, A plurality of said battery cells are arranged along the second direction, and each said support boss extends along the second direction to simultaneously support all said battery cells in the second direction; The base plate is provided with a plurality of exhaust channels, each of which is located between two adjacent support bosses and is correspondingly arranged with a plurality of battery cells.

13. The battery pack according to claim 12, characterized in that, The base plate has an outer side facing away from the battery cell. The exhaust channel includes a plurality of sub-channels and at least one converging channel. The plurality of sub-channels are arranged at intervals along the second direction. At least some of the sub-channels are connected to the same converging channel. The converging channel extends along the second direction and has an exhaust port facing away from the sub-channels. The exhaust port is located on the outer side.

14. The battery pack according to claim 13, characterized in that, The exhaust passage is cut off along a reference plane perpendicular to the second direction, and the cross-sectional shape of the collecting passage is inclined relative to the first direction.

15. The battery pack according to claim 1, characterized in that, The battery pack has a first direction, a second direction and a third direction that intersect each other in pairs. The bottom plate is connected to a side plate on each of the opposite sides in the second direction. Each side plate is provided with a side exhaust port that runs through the second direction. The base plate has an outer side facing away from the battery cell. A current collector is connected to the outer side. The current collector includes protrusions and grooves that are alternately designed along the third direction. The protrusions are connected to the base plate so that the grooves and the outer side are connected to form a current collection channel. The current collection channel is through along the second direction. The exhaust channel has an exhaust port located on the outer side and is connected to the current collection channel.

16. An electrical appliance, characterized in that, Includes the battery pack as described in any one of claims 1 to 15.

Images