Battery pack box body and battery pack

Abstract

The embodiment of the utility model discloses a battery pack box body and a battery pack. The battery pack box body comprises a bottom plate; the edge beam is arranged on one side of the bottom plate; the cross beam is arranged on the side, close to the edge beam, of the bottom plate, at least part of the cross beam is connected with the edge beam through a welding part, and at least part of the cross beam, the edge beam and the welding part are matched to define an airtight cavity; and the detection part is arranged on at least one of the cross beam and the edge beam, the detection part is in fluid communication with the airtight cavity, and the detection part is used for detecting the airtightness of the airtight cavity. According to the air tightness detection device, the detection part is used for detecting and identifying the welding air tightness among the cross beam, the edge beam and the welding part in time, unqualified battery pack box bodies are prevented from being conveyed to the next working procedure for continuous machining, the welding effect between the cross beam and the edge beam is guaranteed, and the production efficiency and the structural reliability of the battery pack box bodies are improved; and the production efficiency and the safety of the battery pack are improved.

Description

Technical Field

[0001] The present application relates to the technical field of battery packs, and in particular to a battery pack case and a battery pack. Background Art

[0002] With the rapid development of the new energy industry, battery packs with high capacity, high cycle life and high safety performance have been widely used and developed. As one of the core parts of the battery pack, it is very important to maintain the structural reliability of the battery pack box. Some parts of the existing battery pack box are fixed by welding, but welding defects may affect the structural reliability of the box, thereby affecting the safety of the battery pack. Utility Model Content

[0003] Embodiments of the present application provide a battery pack case and a battery pack to improve the structural reliability of the battery pack case.

[0004] In order to solve the above technical problems, the embodiments of the present application disclose the following technical solutions:

[0005] In one aspect, a battery pack case is provided, comprising: a bottom plate;

[0006] A side beam, arranged on one side of the bottom plate;

[0007] A cross beam is disposed on a side of the bottom plate adjacent to the side beam, at least a portion of the cross beam is connected to the side beam via a welding portion, and at least a portion of the cross beam, the side beam and the welding portion cooperate to form an airtight cavity; and

[0008] A detection part is provided on at least one of the cross beam and the side beam, the detection part is in fluid communication with the airtight cavity, and the detection part is used to detect the airtightness of the airtight cavity.

[0009] In addition to one or more features disclosed above, or as an alternative, the detection portion is a detection hole, the detection hole is opened in at least one of the cross beam and the side beam, and the detection hole is fluidically connected to the airtight cavity, and the detection hole is fluidically connected to an external airtightness detection device.

[0010] In addition to or as an alternative to one or more of the features disclosed above, the battery pack case has a first orientation;

[0011] The crossbeam extends along the first direction, and is provided with a welded outer wall at at least one end of the crossbeam in the first direction. The side beam has a welded inner wall close to the crossbeam. The welded outer wall and the welded inner wall are welded to form the welding portion, and the detection hole is opened in the welded outer wall.

[0012] In addition to one or more of the features disclosed above, or as an alternative, the welding outer wall includes a main body and a welding skirt, the main body is connected to the crossbeam, the welding skirt is protruded along the first direction on the circumferential area of ​​the main body, the welding skirt is welded to the welding inner wall to form the welding portion, and the main body, the welding inner wall, the welding skirt and the welding portion cooperate to form an airtight cavity.

[0013] In addition to or as an alternative to one or more of the features disclosed above, the crossbeam further has a reinforcing rib portion, which is arranged in the airtight cavity and connected to the welded outer wall, and the reinforcing rib portion extends along the first direction and is spaced apart from the welded inner wall.

[0014] In addition to or as an alternative to one or more of the features disclosed above, the battery pack case has a first orientation;

[0015] The crossbeam is provided with an avoidance groove, the avoidance groove is arranged close to the detection part in the first direction, and the avoidance groove is used to avoid an external air source component.

[0016] In addition to or as an alternative to one or more of the features disclosed above, the method further includes: a sealing element, which is arranged on the welding outer wall and surrounds the detection hole.

[0017] In addition to or as an alternative to one or more of the features disclosed above, the battery pack case further includes a sealing element, which blocks the detection hole.

[0018] In addition to or as an alternative to one or more of the features disclosed above, the battery pack case further has a second direction intersecting with the first direction;

[0019] The crossbeam comprises: a first crossbeam portion, a second crossbeam portion and a third crossbeam portion;

[0020] The first cross beam portion, the second cross beam portion and the third cross beam portion all extend along the first direction, the first cross beam portion, the second cross beam portion and the third cross beam portion are arranged at intervals in the second direction, and the first cross beam portion, the second cross beam portion and the third cross beam portion are all welded to the side beam, and the first cross beam portion, the second cross beam portion and the side beam cooperate to form a accommodating cavity for accommodating a single battery.

[0021] On the other hand, an electrical device is further disclosed. In addition to or instead of one or more of the features disclosed above, the electrical device includes a battery pack case as described in any one of the above items; and a single cell housed in the battery pack case.

[0022] One of the above technical solutions has the following advantages or beneficial effects: In the present application, a detection part is arranged on at least one of the crossbeam and the side beam, and the detection part is connected to the fluid of the airtight cavity, so that after the welding of the crossbeam and the side beam is completed, the detection part can be used in time to detect and identify the welding airtightness between the crossbeam, the side beam and the welding part, thereby avoiding unqualified battery pack bodies from being transported to the next process for further processing, ensuring the welding effect between the crossbeam and the side beam, improving the structural reliability of the battery pack body, and thereby improving the safety of battery pack use. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The technical solution and other beneficial effects of the present application will be made apparent by describing in detail the specific implementation methods of the present application in conjunction with the accompanying drawings.

[0024] Figure 1 is a three-dimensional structural view of a battery pack box provided according to an embodiment of the present application;

[0025] Figure 2 is a cross-sectional view of a battery pack box along the AA direction according to an embodiment of the present application;

[0026] Figure 3 is a cross-sectional view of a battery pack box along the AA direction according to another embodiment of the present application;

[0027] Figure 4 is an exploded structural view of a battery pack box provided according to an embodiment of the present application;

[0028] Figure 5 yes Figure 2 A partial enlarged view of point B in the middle;

[0029] Figure 6 yes Figure 2 A partial enlarged view of point C in the middle;

[0030] Figure 7 yes Figure 2 A partial enlarged view of point D in the middle;

[0031] Figure 8 This is an exploded structural view of a cross beam and a side beam provided according to an embodiment of the present application.

[0032] Description of reference numerals:

[0033] 100. Battery pack box;

[0034] 110, side beam; 111, welded inner wall;

[0035] 120, bottom plate;

[0036] 130, beam; 131, airtight cavity; 132, welding portion; 133, welded outer wall; 134, welded skirt; 135, reinforcing rib portion; 136, avoidance groove; 137, first beam portion; 138, second beam portion; 139, third beam portion;

[0037] 140. detection unit; 141. detection hole;

[0038] 150. Sealing element;

[0039] 160, longitudinal beam; 161, avoidance groove;

[0040] 170, bottom cold plate; 171, liquid cooling channel;

[0041] 180, accommodating chamber;

[0042] 190. Fixing elements. DETAILED DESCRIPTION

[0043] In order to make the purpose, technical solution and beneficial effects of this application more clear, the following further describes this application in detail in conjunction with the accompanying drawings and specific implementation methods. It should be understood that the specific implementation methods described in this specification are only for explaining this application, not for limiting this application.

[0044] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" refers to two or more, unless otherwise clearly and specifically defined.

[0045] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0046] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0047] The term "parallel" in this application includes not only the absolute parallel situation, but also the generally parallel situation conventionally recognized in engineering, such as "parallel" refers to the state where the angle formed by a straight line, a straight line and a plane, or a plane and a plane is -1° to 1°; at the same time, "vertical" also includes not only the absolute vertical situation, but also the generally vertical situation conventionally recognized in engineering, such as "vertical" refers to the state where the angle formed by a straight line, a straight line and a plane, or a plane and a plane is 89° to 91°. Equal distances or equal angles include not only the absolute equal situation, but also the generally equal situation conventionally recognized in engineering, that is, there may be a certain error, such as the state where the tolerance range is -1% to 1%.

[0048] In the embodiments of the present application, refer to Figures 1 to 8 The present application provides a battery pack, which may include: a battery pack case 100, a single cell (not shown in the figure) and a top cover (not shown in the figure), the single cell is accommodated in the battery pack case 100, and the top cover is connected to the battery pack case 100 to seal the battery pack case 100.

[0049] The battery pack may be a battery pack with three levels of single cell-battery module-battery pack, or a module-free battery pack with two levels of single cell-battery pack, but is not limited thereto.

[0050] The single cell may be a secondary battery, which refers to a single cell that can be used continuously by activating the active material by charging after the single cell is discharged. Exemplarily, the single cell may be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel metal hydride battery or a nickel cadmium battery, but is not limited thereto.

[0051] The single battery may be cylindrical, flat, rectangular or other shapes, but is not limited thereto.

[0052] Specifically, in one embodiment, the battery pack body 100 includes side beams 110 , a bottom plate 120 , a cross beam 130 and a detection unit 140 .

[0053] The side beam 110 is arranged on one side of the bottom plate 120; the cross beam 130 is arranged on one side of the bottom plate 120 adjacent to the side beam 110, at least part of the cross beam 130 is connected to the side beam 110 via a welding portion 132, and at least part of the cross beam 130, the side beam 110 and the welding portion 132 cooperate to form an airtight cavity 131; the detection portion 140 is arranged on at least one of the cross beam 130 and the side beam 110, that is, the detection portion 140 can be arranged on the cross beam 130, the detection portion 140 can be arranged on the side beam 110, and the detection portion 140 can also be arranged on the cross beam 130 and the side beam 110 at the same time.

[0054] The detection part 140 is fluidically connected to the airtight cavity 131 , and is used to detect the airtightness of the airtight cavity 131 , that is, the detection part 140 is used to detect whether there are welding defects in the welding part 132 . Exemplarily, the detection part 140 is used to detect whether there are cracks in the welding part 132 that affect the airtightness of the airtight cavity 131 .

[0055] The bottom plate 120 can be formed integrally with the side beam 110 and the cross beam 130, or the bottom plate 120 can be separately provided with the side beam 110 and the cross beam 130, and the two are fixedly connected, for example, the bottom plate 120, the side beam 110 and the cross beam 130 are fixedly connected by welding, screwing and other processes, which are not specifically limited in this application and can be specifically provided according to actual circumstances. For example, the bottom plate 120, the side beam 110 and the cross beam 130 are separately provided, and the bottom plate 120, the side beam 110 and the cross beam 130 are fixedly connected by welding processes.

[0056] The bottom plate 120 , the side beam 110 and the cross beam 130 are all made of common steel or aluminum, but are not limited thereto.

[0057] The side beam 110 and the cross beam 130 can be formed by different molding processes according to different materials. Specifically, for example, when the side beam 110 and the cross beam 130 are made of ordinary steel, the steel can be bent multiple times by using a bending device, and then welded to form the side beam 110 and the cross beam 130 after the multiple bending. When the side beam 110 and the cross beam 130 are made of aluminum, the side beam 110 and the cross beam 130 can be formed by using molding equipment such as extrusion and die casting.

[0058] The bottom plate 120 can be formed by punching a steel plate using a punching device.

[0059] The cross beam 130 and the side beam 110 are welded by cold metal transition welding technology, but the invention is not limited thereto.

[0060] It is understandable that since the cross beam 130 and the side beam 110 are connected by the welding part 132, the defects such as cracks that may exist on the welding part 132 will affect the welding reliability between the two, and further affect the structural reliability of the battery pack case 100, and even affect the safety of the battery pack. However, the reliability identification of the existing battery pack case 100 can only be identified in the final inspection process of the finished product of the battery pack case 100, which can easily lead to rework or scrapping of the battery pack case 100, reduce the manufacturing efficiency of the battery pack case 100, and further lead to low production efficiency of the battery pack.

[0061] In the present application, the detection part 140 is arranged on at least one of the crossbeam 130 and the side beam 110, and the detection part 140 is fluidically connected to the airtight cavity 131, so that after the crossbeam 130 and the side beam 110 are welded, the detection part 140 can be used in time to detect and identify the welding airtightness between the crossbeam 130, the side beam 110 and the welding part 132, so as to identify the welding reliability, avoid unqualified battery pack case 100 from being conveyed to the next process for further processing, ensure the welding effect between the crossbeam 130 and the side beam 110, improve the production efficiency of the battery pack case 100, and then improve the production efficiency of the battery pack, while reducing the production cost of the battery pack case 100, and also ensure the structural reliability of the battery pack case 100 and the safety of the battery pack.

[0062] In one embodiment, referring to Figures 2 to 7 The detection portion 140 is a detection hole 141, which is opened in at least one of the cross beam 130 and the side beam 110, that is, the detection hole 141 can be set on the cross beam 130, the detection hole 141 can also be set on the side beam 110, and the detection hole 141 can also be set on both the cross beam 130 and the side beam 110. The detection hole 141 is in fluid communication with the airtight cavity 131, and the detection hole 141 is in fluid communication with an external airtightness detection device.

[0063] The detection hole 141 may be integrally formed with the cross beam 130 and / or the side beam 110 , or the cross beam 130 and the side beam 110 may be formed first, and then the detection hole 141 may be processed on the cross beam 130 and / or the side beam 110 using processing equipment.

[0064] The detection hole 141 may be polygonal, circular or other irregular shapes, but is not limited thereto.

[0065] The external airtightness detection device may be an air pump, but is not limited thereto. The airtightness detection device may have an air nozzle to be inserted into the detection hole 141 to communicate with the airtight cavity 131 .

[0066] It can be understood that after the welding between the cross beam 130 and the side beam 110 is completed to form the welding portion 132, the staff can connect the output end of the external airtightness detection device (such as an air nozzle) to the detection hole 141 to connect the airtightness detection element with the fluid of the airtight cavity 131, and realize the airtightness identification and detection of the airtight cavity 131 by identifying whether the air pressure drops or applying bubbling water to the weld to see whether bubbles are generated.

[0067] Specifically, after the external gas source delivers gas to the airtight cavity 131 through the detection hole 141 for a period of time, if the air pressure in the airtight cavity 131 drops, the weld 132 has defects such as cracks, and the welding air tightness between the cross beam 130, the side beam 110 and the weld 132 is poor. After the external gas source delivers gas to the airtight cavity 131 through the detection hole 141 for a period of time, if the air pressure in the airtight cavity 131 remains unchanged, the weld 132 does not have defects such as cracks, and the cross beam 130, the side beam 110 and the weld 132 have excellent welding air tightness.

[0068] The present application sets a detection hole 141 to connect the air source component with the fluid of the airtight cavity 131, and timely utilizes the detection hole 141 to detect and identify the welding air tightness between the cross beam 130, the side beam 110 and the welding part 132, so as to avoid unqualified battery pack body 100 being transported to the next process for further processing, ensure the welding effect between the cross beam 130 and the side beam 110, improve the production efficiency of the battery pack body 100, and further improve the production efficiency of the battery pack; at the same time, the detection hole 141 is simple in structure and easy to process and shape.

[0069] Furthermore, in the present application, an airtight detection layer may be coated on the outer surface of the welding portion 132. For example, in the present application, a bubble water layer may be coated on the outer surface of the welding portion 132. When the external gas source component delivers gas to the airtight cavity 131 through the detection hole 141, it is possible to observe whether bubbles are generated in the bubble water layer to determine whether the welding portion 132 has defects such as cracks that cause air leakage, so as to identify the airtightness of the welding between the cross beam 130, the side beam 110 and the welding portion 132.

[0070] Specifically, when the external gas source delivers gas to the airtight cavity 131 through the detection hole 141 , if bubbles are generated in the bubble water layer, the welding portion 132 has defects such as cracks, and the welding air tightness between the cross beam 130 , the side beam 110 and the welding portion 132 is poor.

[0071] When the external gas source delivers gas to the airtight cavity 131 through the detection hole 141 , if the bubble water layer does not generate bubbles, the welding portion 132 does not have defects such as cracks, and the cross beam 130 , the side beam 110 and the welding portion 132 have excellent welding air tightness.

[0072] In one embodiment, the battery pack case 100 has a first direction X, a second direction Y, and a third direction Z that intersect in pairs. Exemplarily, the battery pack case 100 has a first direction X, a second direction Y, and a third direction Z that are perpendicular to each other in pairs.

[0073] The first direction X is the width direction of the battery pack case 100 , the second direction Y is the length direction of the battery pack case 100 , and the third direction Z is the height direction of the battery pack case 100 .

[0074] Specifically, refer to Figure 2 , the crossbeam 130 extends along the first direction X, and the crossbeam 130 is provided with a welded outer wall 133 at at least one end in the first direction X, the side beam 110 has a welded inner wall 111 close to the crossbeam 130, the welded outer wall 133 and the welded inner wall 111 are welded to form a welded portion 132, and the detection hole 141 is opened in the welded outer wall 133. Preferably, the crossbeam 130 is provided with a welded outer wall 133 at both ends in the first direction X. The present application forms a welded portion 132 by welding the welded outer wall 133 and the welded inner wall 111 to facilitate the welding between the crossbeam 130 and the side beam 110, thereby improving the welding efficiency between the crossbeam 130 and the side beam 110, and thereby improving the production efficiency of the battery pack case 100.

[0075] In this embodiment, the orthographic projection area of ​​the welding outer wall 133 in the first direction perpendicular to X is larger than the orthographic projection area of ​​the beam 130 in the first direction perpendicular to X, so as to increase the volume of the airtight cavity 131, thereby facilitating the setting of the detection unit 140 and improving the detection accuracy.

[0076] It should be understood that the detection hole 141 is not limited to being opened on the welding outer wall 133. Other arrangements, for example, the detection hole 141 is opened on the welding inner wall 111, or the detection hole 141 is opened on both the welding outer wall 133 and the welding inner wall 111, can also achieve the effect of the present application and should also be regarded as the technical solution of the present application.

[0077] In one embodiment, referring to Figure 3The welding outer wall 133 includes a main body and a welding skirt 134. The main body is connected to the cross beam 130. The welding skirt 134 is protruded along the first direction X in the circumferential area of ​​the main body. The welding skirt 134 and the welding inner wall 111 are welded to form a welding portion 132. The main body, the welding inner wall 111, the welding skirt 134 and the welding portion 132 cooperate to form an airtight cavity 131.

[0078] The present application forms a welding portion 132 by welding the welding skirt 134 to the welding inner wall 111, so as to further facilitate the welding between the cross beam 130 and the side beam 110, improve the welding efficiency and welding reliability between the cross beam 130 and the side beam 110, and thus improve the production efficiency of the battery pack case 100 and the safety of the battery pack.

[0079] In one embodiment, referring to Figures 2 to 3 The crossbeam 130 also has a reinforcing rib 135, which is disposed in the airtight cavity 131 and connected to the welded outer wall 133. The reinforcing rib 135 extends along the first direction X, and the reinforcing rib 135 is spaced apart from the welded inner wall 111. In the present application, the reinforcing rib 135 is provided on the crossbeam 130 to improve the side collision resistance of the battery pack box 100, thereby improving the safety performance of the battery pack box 100, avoiding damage to the battery pack when a collision occurs, and improving the safety performance of the battery pack.

[0080] Among them, the reinforcing rib portion 135 can be integrally formed with the beam 130, and the reinforcing rib portion 135 can also be separately set from the beam 130. Exemplarily, the reinforcing rib portion 135 is fixedly connected to the beam by welding and other processes, but is not limited to this. No specific limitation is made in this application and it can be specifically set according to actual circumstances.

[0081] In one embodiment, referring to Figures 5 to 7 An avoidance groove 136 is provided on the crossbeam 130 and is arranged near the detection part 140 in the first direction X. The avoidance groove 136 is used to avoid an external air tightness detection device so that the staff can operate the external air tightness detection device to perform air tightness identification detection after welding is completed, thereby improving the detection efficiency.

[0082] In one embodiment, referring to Figures 5 to 7 The battery pack case 100 further includes a sealing element 150, which is disposed on the welded outer wall 133 and surrounds the detection hole 141. In the present application, the sealing element 150 is disposed at the detection hole 141 to ensure the airtightness of the detection hole 141 when the air source component is connected to the detection hole 141, thereby ensuring the accuracy of the detection result.

[0083] The sealing element 150 may be a sealing ring, but is not limited thereto.

[0084] In other embodiments, the sealing element 150 is at least partially disposed in the detection hole 141 to block the detection hole 141, so as to ensure the sealing of the airtight cavity 131 when the airtightness test is not performed, and to prevent other impurities from entering the airtight cavity 131 and affecting the welding reliability of the cross beam 130 and the side beam 110.

[0085] In one embodiment, referring to Figure 1 The cross beam 130 includes a first cross beam portion 137 , a second cross beam portion 138 and a third cross beam portion 139 .

[0086] The first cross beam portion 137, the third cross beam portion 139 and the second cross beam portion 138 all extend along the first direction X and are arranged at intervals in the second direction Y, and the first cross beam portion 137, the second cross beam portion 138 and the third cross beam portion 139 are all welded to the side beam 110, and the first cross beam portion 137, the second cross beam portion 138 and the side beam 110 cooperate to form a accommodating cavity 180, which is used to accommodate single cells.

[0087] It can be understood that in the present application, the first cross beam portion 137, the second cross beam portion 138 and the third cross beam portion 139 are all welded to the side beam 110 to ensure the number of welding positions of the battery pack case 100 as a whole, reduce the impact of welding deformation on the battery pack case 100 as a whole, ensure the structural stability of the battery pack case 100, and further ensure the safety performance of the battery pack case 100.

[0088] In one embodiment, referring to Figure 4 The battery pack body 100 further includes: a longitudinal beam 160 , a bottom cold plate 170 and a fixing element 190 .

[0089] The longitudinal beam 160 extends along the second direction Y, and the two ends of the longitudinal beam 160 along the second direction Y are respectively screwed to the first cross beam portion 137 and the second cross beam portion 138, and the longitudinal beam 160 is screwed to the third cross beam portion 139, further improving the overall strength of the battery pack case 100 and enhancing the impact and extrusion resistance of the battery pack case 100.

[0090] The bottom cold plate 170 is connected to the side of the bottom plate 120 away from the accommodating cavity 180, and a liquid cooling channel 171 is provided on the bottom cold plate 170. The bottom cold plate 170 is screwed to the bottom plate 120 through a fixing element 190. The present application arranges the bottom cold plate 170 on the side of the bottom plate 120 away from the accommodating cavity 180, so as to utilize the bottom cold plate 170 to perform liquid cooling and heat dissipation on the single battery, thereby ensuring the normal operation of the single battery and improving the safety performance of the battery pack.

[0091] The fixing element 190 is a bolt, but is not limited thereto.

[0092] It should be understood that the longitudinal beam 160 in the present application is not limited to being screwed with the first cross beam portion 137, the second cross beam portion 138 and the third cross beam portion 139. Other connection methods, for example, the longitudinal beam 160 is welded to the first cross beam portion 137, the second cross beam portion 138 and the third cross beam portion 139, or the longitudinal beam 160 is clamped to the first cross beam portion 137, the second cross beam portion 138 and the third cross beam portion 139, etc., can also achieve a fixed connection between the longitudinal beam 160 and the first cross beam portion 137, the second cross beam portion 138 and the third cross beam portion 139, which should also be regarded as embodiments of the present application.

[0093] On the other hand, in an embodiment of the present application, the present application further provides an electrical device, comprising a battery pack as described in any of the above embodiments, wherein the battery pack serves as a power supply for the electrical device.

[0094] Among them, electrical devices may be, but are not limited to, mobile devices (such as mobile phones, laptops, etc.), electric vehicles (such as pure electric vehicles, hybrid electric vehicles, plug-in hybrid electric vehicles, electric bicycles, electric scooters, electric golf carts, electric trucks, etc.), electric trains, ships and satellites, energy storage systems, etc.

[0095] The introduction provided in the above steps is only used to help understand the method, structure and core idea of ​​the present application. For ordinary technicians in this technical field, without departing from the principles of the present application, several improvements and modifications can be made to the present application, and these improvements and modifications also fall within the scope of protection of the claims of the present application.

Claims

1. A battery pack box, characterized in that: include: Base plate; A side beam, arranged on one side of the bottom plate; A cross beam is arranged on one side of the bottom plate adjacent to the side beam, at least part of the cross beam is connected to the side beam via a welding portion, and at least part of the cross beam, the side beam and the welding portion cooperate to form an airtight cavity; as well as A detection part is provided on at least one of the cross beam and the side beam, the detection part is in fluid communication with the airtight cavity, and the detection part is used to detect the airtightness of the airtight cavity.

2. The battery pack box according to claim 1, characterized in that: The detection portion is a detection hole, which is opened in at least one of the cross beam and the side beam, and the detection hole is in fluid communication with the airtight cavity, and the detection hole is in fluid communication with an external airtightness detection device.

3. The battery pack box according to claim 2, characterized in that: The battery pack case has a first direction; The crossbeam extends along the first direction, and is provided with a welded outer wall at at least one end of the crossbeam in the first direction. The side beam has a welded inner wall close to the crossbeam. The welded outer wall and the welded inner wall are welded to form the welding portion, and the detection hole is opened in the welded outer wall.

4. The battery pack box according to claim 3, characterized in that: The welding outer wall includes a main body and a welding skirt, the main body is connected to the crossbeam, the welding skirt is protruded along the first direction on the circumferential area of ​​the main body, the welding skirt is welded to the welding inner wall to form the welding part, and the main body, the welding inner wall, the welding skirt and the welding part cooperate to form an airtight cavity.

5. The battery pack box according to claim 3, characterized in that: The cross beam further comprises a reinforcing rib portion, wherein the reinforcing rib portion is disposed in the airtight cavity and connected to the welded outer wall, and the reinforcing rib portion extends along the first direction and is spaced apart from the welded inner wall.

6. The battery pack case according to claim 1, characterized in that: The battery pack case has a first direction; The crossbeam is provided with an avoidance groove, the avoidance groove is arranged close to the detection part in the first direction, and the avoidance groove is used to avoid an external air source component.

7. The battery pack box according to claim 3, characterized in that: The battery pack case further includes: a sealing element, which is arranged on the welding outer wall and surrounds the detection hole.

8. The battery pack case according to claim 2, characterized in that: The battery pack case further includes a sealing element, which blocks the detection hole.

9. The battery pack case according to claim 3, characterized in that: The battery pack case also has a second direction intersecting with the first direction; The crossbeam comprises: a first crossbeam portion, a second crossbeam portion and a third crossbeam portion; The first cross beam portion, the third cross beam portion and the second cross beam portion all extend along the first direction and are arranged at intervals in the second direction, and the first cross beam portion, the second cross beam portion and the third cross beam portion are all welded to the side beam, and the first cross beam portion, the second cross beam portion and the side beam cooperate to form a accommodating cavity for accommodating a single battery.

10. A battery pack, characterized in that: include: The battery pack box according to any one of claims 1 to 9; as well as The single cell is housed in the battery pack box.

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