Battery detection equipment

Abstract

The embodiment of the utility model provides battery detection equipment, and belongs to the technical field of batteries. The battery detection equipment comprises a detection tool and an inflation device, the detection tool forms a placement cavity and an inflation inlet, the placement cavity is used for placing a battery box body, the wall surface of the placement cavity is hermetically connected with the outer wall of the battery box body to form a detection cavity, and the inflation inlet is communicated with the detection cavity; the inflation device is connected with the inflation inlet and used for inflating the detection cavity through the inflation inlet. The detection tool can be in sealed connection with the outer wall of the battery box body to form the detection cavity, and under the conditions that the detection cavity is in positive pressure and the battery box body has an airtight failure point, air inflation can be performed from outside to inside of the battery box body, so that a sealing welding seam is exposed in a detectable space, and the detection efficiency is improved. The airtight failure point of the sealing weld joint can be detected from the inner side of the battery box body.

Description

Technical Field

[0001] This application relates to the field of battery technology, and more specifically, to a battery testing device. Background Technology

[0002] When welding the side beams of the frame using steel roll-formed profiles or aluminum extruded profiles, or when welding the frame to the base plate or the frame to the top cover, it is usually necessary to set sealing welds at the outer or inner welding points to form a sealed space inside the box. However, current battery testing equipment cannot accurately determine the airtightness failure point of the battery box, and it needs to be improved. Utility Model Content

[0003] This application provides a battery testing device for detecting airtightness failure points on the inner side of a battery casing.

[0004] In a first aspect, embodiments of this application provide a battery testing device, including:

[0005] The testing fixture forms a placement cavity and an inflation port. The placement cavity is used to place the battery box, and the wall of the placement cavity is sealed to the outer wall of the battery box to form the testing cavity. The inflation port is connected to the testing cavity.

[0006] An inflation device, connected to the inflation port, is used to inflate the detection chamber through the inflation port.

[0007] In the above technical solution, by setting up a testing fixture, the testing fixture can be sealed to the outer wall of the battery box to form a testing cavity. When the testing cavity is under positive pressure and there is an airtightness failure point in the battery box, air can be injected from the outside to the inside of the battery box, thereby exposing the sealing weld to the detectable space, and the airtightness failure point of the sealing weld can be detected from the inside of the battery box.

[0008] In some embodiments, the detection fixture includes:

[0009] The first part is enclosed outside the battery box;

[0010] The second part is detachably connected to the first part, and the first part, the second part, and the battery box are sealed together to form the detection cavity. The air inlet is located in the first part or the second part.

[0011] In some embodiments, the first portion includes a first wall and a second wall that are bent relative to each other, the first wall being for sealing connection with the top surface of the battery housing, the second wall being for sealing connection with the second portion, the second portion being for sealing connection with the bottom surface of the battery housing, and the air inlet being disposed in the second portion.

[0012] In some embodiments, the device further includes a first seal, a second seal, and a third seal, wherein the first seal is disposed between the first wall and the top surface of the battery housing, the second seal is disposed between the second wall and the second portion, and the third seal is disposed between the second portion and the bottom surface of the battery housing.

[0013] In some embodiments, with the height direction of the battery box as the projection direction, the projection of the third seal is located within the projection of the frame of the battery box, or the projection of the third seal is located within the projection of the bottom plate of the battery box.

[0014] In some embodiments, with the height direction of the battery housing as the projection direction, the projection of the air inlet is located between the projection of the second seal and the projection of the third seal.

[0015] In some embodiments, the testing fixture includes a locking assembly, which includes a connector and a clamping member. The connector extends along the distribution direction of the first portion and the second portion, and the clamping member is movably disposed on the connector. The clamping member is connected to the second portion and the first portion.

[0016] In some embodiments, the connector and the clamping member are threaded together.

[0017] In some embodiments, the second part is further provided with a support leg for raising the body of the second part.

[0018] In some embodiments, the detection fixture has a detection port. When the battery box is placed in the placement cavity, with the height direction of the battery box as the projection direction, the projection of the detection port and the projection of the inner cavity of the battery box have an overlapping area. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is one of the structural schematic diagrams of the battery testing device provided in some embodiments of this application;

[0021] Figure 2 This is a second schematic diagram of the structure of a battery testing device provided in some embodiments of this application;

[0022] Figure 3 This is one of the structural schematic diagrams of the battery housing provided in some embodiments of this application;

[0023] Figure 4 This is a second schematic diagram of the structure of the battery housing provided in some embodiments of this application.

[0024] Figure label:

[0025] First part 111, first wall 1111, second wall 1112, second part 112, support leg 1121, placement cavity 113, air inlet 114, detection cavity 115, detection port 116, first seal 12, second seal 13, third seal 14, locking assembly 15, connector 151, clamping component 152;

[0026] Battery housing 2, frame 21, base plate 22, sealing weld 23, external weld 24. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0028] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0029] In this application, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments.

[0030] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0031] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0032] In this application, "multiple" refers to two or more (including two), and similarly, "multiple groups" refers to two or more (including two), and "multiple pieces" refers to two or more (including two).

[0033] In this embodiment of the application, the battery cell can be a secondary battery, which refers to a battery cell that can be recharged to activate the active materials and continue to be used after the battery cell has been discharged.

[0034] The battery cell can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and the embodiments of this application are not limited to this.

[0035] Battery cells can be cylindrical, flat, cuboid, or other shapes, and this application embodiment is not limited to any of these. Battery cells are generally classified into three types according to their packaging method: cylindrical battery cells, square battery cells, and pouch battery cells, and this application embodiment is not limited to any of these types either.

[0036] A battery cell includes a casing, electrode components, and electrolyte. The casing houses the electrode components and electrolyte. The electrode components consist of a positive electrode, a negative electrode, and a separator. The battery cell primarily functions by the movement of metal ions between the positive and negative electrode components. The positive electrode includes a positive current collector and a positive active material layer. The positive current collector includes a current collector body and a positive electrode tab. The positive active material layer is coated on the surface of the current collector body, while the positive electrode tab is not coated with the positive active material layer and protrudes from the current collector body. Taking a lithium-ion battery as an example, the material of the positive current collector can be aluminum, and the positive active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc. The negative electrode includes a negative current collector and a negative active material layer. The negative current collector includes a current collector body and a negative electrode tab. The negative active material layer is coated on the surface of the current collector body, while the negative electrode tab is not coated with the negative active material layer and protrudes from the current collector body. The negative electrode current collector can be made of copper, and the negative electrode active material can be carbon or silicon, etc. To ensure that a large current can be passed without melting, there are multiple positive electrode tabs stacked together, and there are multiple negative electrode tabs stacked together.

[0037] The separator can be made of PP (polypropylene) or PE (polyethylene), etc. Furthermore, the electrode assembly can be a wound structure or a stacked structure; the embodiments of this application are not limited to these.

[0038] The technical solutions described in the embodiments of this application are applicable to various electrical devices that use individual battery cells, such as mobile phones, portable devices, laptops, electric vehicles, electric toys, power tools, vehicles, ships, and spacecraft, including aircraft, rockets, space shuttles, and spacecraft. Individual battery cells are used to store or provide electrical energy.

[0039] The inventors discovered that when welding the side beams of a frame using rolled steel profiles or extruded aluminum profiles, or when welding the frame to the base plate or the top cover, sealing welds are typically required at the outer or inner weld seams to create a sealed space inside the enclosure. During battery assembly, the battery enclosure needs to be tested for airtightness, specifically the sealing welds, to identify potential leak points. With technological advancements, when the sealing welds are located on the outer wall of the enclosure, the enclosure can be inflated, and external leak detection can be performed to determine airtightness and leak points. However, as the frame is given more and more structural functions, such as cover bolt connections, battery pack mounting holes, and accessory mounting brackets, the number of sealing points on the outer side of the frame increases, making a good seal impossible.

[0040] To address these issues, related technologies consider moving the sealing weld to the inside of the battery housing. However, if the original sealing detection method is still used, the problem of not being able to pinpoint the leak point arises. During airtightness testing, gas entering the profile from a leak point inside the battery housing may leak out from any gap outside the frame or machining feature point, making it impossible to trace and screen for leaks in the inner area of ​​the battery housing.

[0041] Based on the above considerations, in order to solve the problem that the airtightness testing schemes of related technologies cannot determine the leakage point of the sealing weld located inside the battery box, the inventors, after in-depth research, designed a battery testing device, including: a testing fixture and an inflation device. The testing fixture forms a placement cavity and an inflation port. The placement cavity is used to place the battery box, and the wall of the placement cavity is sealed to the outer wall of the battery box to form the testing cavity. The inflation port is connected to the testing cavity. The inflation device is connected to the inflation port and is used to inflate the testing cavity through the inflation port.

[0042] In this type of battery testing equipment, by setting up a testing fixture, the testing fixture can be sealed to the outer wall of the battery box to form a testing chamber. When the testing chamber is under positive pressure and there is an airtightness failure point in the battery box, air can be injected from the outside to the inside of the battery box, thereby exposing the sealing weld to the detectable space. The airtightness failure point of the sealing weld can be detected from the inside of the battery box.

[0043] The battery apparatus mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells connected in series, parallel, or mixed connections via a busbar.

[0044] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells.

[0045] As an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells together to form an independent module. As another example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0046] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more individual battery cells housed within the housing.

[0047] As an example, the battery cell assembly can be a battery module, which can be housed in a housing by fixing the battery module in the housing.

[0048] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0049] As an example, the enclosure may include a first part and a second part. The first part and the second part are fastened together to form a closed space inside the enclosure to house the individual battery cells. Here, "closed" refers to covering or closing, and can be either sealed or unsealed. The first part may be a top cover or a bottom plate.

[0050] As an example, the enclosure may include a top cover, a frame, and a bottom plate. The top cover and bottom plate are connected to the frame, creating an enclosed space inside the enclosure to house the individual battery cells.

[0051] In some embodiments, the housing may be part of the vehicle's chassis structure. For example, a portion of the housing may be at least a part of the vehicle's floor, or a portion of the housing may be at least a part of the vehicle's crossbeams and longitudinal beams.

[0052] The technical solutions described in the embodiments of this application are applicable to various electrical devices that use battery devices, such as mobile phones, portable devices, laptops, electric vehicles, electric toys, power tools, vehicles, ships, and spacecraft, etc. For example, spacecraft include airplanes, rockets, space shuttles, and spacecraft. The battery device is used to store or provide electrical energy.

[0053] According to some embodiments of this application, such as Figure 1 and Figure 2 As shown, this application provides a battery testing device, which includes a testing fixture and an inflation device.

[0054] The battery testing equipment is used to test the airtightness of the battery box 2.

[0055] like Figure 3 and Figure 4 As shown, the battery housing 2 may include a top cover, a frame 21, and a bottom plate 22. The top cover and the bottom plate 22 are respectively connected to the frame 21, so that the interior of the housing forms a closed space to accommodate individual battery cells or battery cell assemblies.

[0056] The frame 21 can be welded from steel roll-formed profiles or aluminum extruded profiles, and the joints of the profiles form inner welds and outer welds 24. The airtightness failure point of the battery box 2 is likely to exist in the inner weld or the outer weld 24.

[0057] like Figure 2 As shown, the testing fixture forms a placement cavity 113 and an air inlet 114. The testing fixture can be designed as a box or cabinet structure. The testing fixture has a placement cavity 113 inside for placing the battery box 2.

[0058] The placement cavity 113 is used to place the battery box 2. Part or all of the battery box 2 can be placed in the placement cavity 113. The size of the placement cavity 113 is set according to the specifications of the battery box 2 to be tested.

[0059] like Figure 2 As shown, the wall of the placement cavity 113 is sealed to the outer wall of the battery box 2 to form a detection cavity 115. When the detection cavity 115 is under positive pressure and there is an airtightness failure point in the battery box 2, air can be injected from the outside to the inside of the battery box 2, thereby exposing the sealing weld 23 in the detectable space, and the airtightness failure point of the sealing weld 23 can be detected from the inside of the battery box 2.

[0060] In this embodiment, the airtightness failure point can be checked inside the battery box 2 using conventional airtightness failure point checking methods. For example, the airtightness failure point can be checked by spraying foam water or using a nitrogen-hydrogen detector, which is simple to operate.

[0061] The detection chamber 115 can surround the periphery of the battery box 2. The unsealed outer weld 24 is located inside the detection chamber 115, while the sealed inner weld is located outside the detection chamber 115. In other words, the outer peripheral wall of the battery box 2 is set inside the detection chamber 115, thereby reducing the leakage of gas from the unsealed outer weld 24 or the machined part of the outer wall after entering the profile, which would affect the airtightness test of the inner weld.

[0062] In some embodiments, such as Figure 2 As shown, a sealing element is designed between the wall of the placement cavity 113 and the outer wall of the battery box 2. The sealing element can be an elastic sealing strip or a sealing gasket.

[0063] In some embodiments, such as Figure 2 As shown, the testing fixture also includes a locking assembly 15. When the battery box 2 is placed into the placement cavity 113, the outer wall of the battery box 2 can be tightly fitted to the wall of the placement cavity 113 by the locking assembly 15, thereby increasing the sealing of the two and forming a sealed testing cavity 115.

[0064] For example, the locking component 15 can be a bolt fastener, a quick-clamp mechanism, or a C-clamp, etc.

[0065] The air inlet 114 is connected to the detection chamber 115 and penetrates the side wall of the detection fixture. The air inflation device is connected to the air inlet 114 and is used to inflate the detection chamber 115 through the air inlet 114 to create a positive pressure inside the detection chamber 115.

[0066] The inflation device can be a gas compressor, air pump or hydraulic pump or other equipment with inflation function. The air outlet of the inflation device is connected to the inflation port 114. The inflation device can directly fill the detection chamber 115 with air or other gases, which is low cost.

[0067] According to some embodiments of this application, such as Figure 2 As shown, the testing fixture has a testing port 116. When the battery box 2 is placed in the placement cavity 113, the projection of the testing port 116 is connected to the inner cavity of the battery box 2.

[0068] According to some embodiments of this application, with the height direction of the battery box 2 as the projection direction, the projection of the detection port 116 and the projection of the inner cavity of the battery box 2 have an overlapping area.

[0069] For example, the projection of the detection port 116 falls within the projection of the inner cavity of the battery box 2, or the projection of the inner cavity of the battery box 2 falls within the projection of the detection port 116; or the projection of the detection port 116 and the projection of the inner cavity of the battery box 2 partially overlap.

[0070] In this embodiment, the inner wall of the battery box 2 can be observed through the detection port 116, which makes it convenient for staff to check the airtightness failure points of the inner wall of the battery box 2 through the detection port 116.

[0071] For example, the detection port 116 is an open through hole, or the detection port 116 is provided with a window that allows the detection port 116 to be opened and closed.

[0072] The testing fixtures include at least the following two structures.

[0073] Firstly, such as Figure 1 and Figure 2 As shown, the testing fixture can be a split structure.

[0074] In this embodiment, the testing fixture includes a first part 111 and a second part 112, which are detachably connected. The first part 111 is covered outside the battery box 2, and the sealed connection of the first part 111, the second part 112 and the battery box 2 forms a testing cavity 115. An air inlet 114 is provided in the first part 111 or the second part 112.

[0075] When in use, the battery box 2 can be placed on the second part 112 first, and then the first part 111 can be placed over the battery box 2. The first part 111 and the battery box 2 are sealed together, the second part 112 and the first part 111 are sealed together, and the second part 112 and the battery box 2 are sealed together.

[0076] By setting the testing fixture as a split structure, it is easier to assemble the battery box 2 with the testing fixture, thus reducing the difficulty of installation.

[0077] According to some embodiments of this application, such as Figure 2As shown, the first part 111 includes a first wall 1111 and a second wall 1112 that are bent relative to each other. The first wall 1111 is used to seal the connection with the top surface of the battery box 2, and the second wall 1112 is sealed to the second part 112. The second part 112 is used to seal the connection with the bottom surface of the battery box 2.

[0078] The first wall 1111 and the second wall 1112 may be bent at an angle or in an arc shape relative to each other. For example, the first wall 1111 and the second wall 1112 may be bent at 90° relative to each other.

[0079] For example, the first wall 1111 and the second wall 1112 can be integrally formed structures, or they can be connected by welding or gluing.

[0080] The first wall 1111 can be sealed to the top cover of the battery box 2 or the top surface of the frame 21; the second part 112 is sealed to the bottom plate 22 of the battery box 2 or the bottom surface of the frame 21.

[0081] In this embodiment, the locking assembly 15 can press the first part 111 and the second part 112 together to achieve a sealed connection between the first part 111, the second part 112 and the battery box 2.

[0082] According to some embodiments of this application, such as Figure 2 As shown, the locking assembly 15 includes a connector 151 and a clamping member 152. The connector 151 extends along the distribution direction of the first part 111 and the second part 112. The clamping member 152 is movably disposed on the connector 151. The clamping member 152 is connected to the second part 112 and the first part 111.

[0083] For example, the locking assembly 15 can be bolted, and the connector 151 and the clamping member 152 are threadedly connected. When the clamping member 152 moves on the connector 151 in the direction close to the second part 112, it can press the first part 111 towards the second part 112 and press the first part 111 towards the battery box 2, thereby achieving a sealed connection between the first part 111, the second part 112 and the battery box 2.

[0084] For example, the locking assembly 15 can be a clamping mechanism. The locking assembly 15 includes a first clamp and a second clamp, which are respectively connected to the first part 111 and the second part 112, and are used to clamp the first part 111 and the second part 112 to achieve a sealed connection between the first part 111, the second part 112 and the battery box 2.

[0085] According to some embodiments of this application, such as Figure 2As shown, the second part 112 is also provided with a support leg 1121. The support leg 1121 is used to raise the body of the second part 112 to reduce the difficulty for staff to check the airtightness of the inner wall of the battery box 2.

[0086] For example, the support legs 1121 may be arranged at intervals along the periphery of the body of the second part 112, or they may be connected to the center of the body of the second part 112.

[0087] According to some embodiments of this application, such as Figure 2 As shown, the testing fixture also includes a first seal 12, a second seal 13 and a third seal 14. The first seal 12 is disposed between the first wall 1111 and the top surface of the battery box 2, the second seal 13 is disposed between the second wall 1112 and the second part 112, and the third seal 14 is disposed between the second part 112 and the bottom surface of the battery box 2.

[0088] For example, the first seal 12, the second seal 13 and the third seal 14 can be structures such as sealing strips or sealing rings.

[0089] In this embodiment, the first sealing member 12 is disposed between the first wall 1111 and the top cover of the battery box 2, or between the first wall 1111 and the top surface of the frame 21.

[0090] The third seal 14 may be installed in at least two of the following locations.

[0091] First, the third seal 14 is disposed between the second part 112 and the bottom plate 22 of the battery box 2.

[0092] With the height direction of the battery box 2 as the projection direction, the projection of the third seal 14 is located within the projection of the bottom plate 22 of the battery box 2.

[0093] With the third seal 14 in this position, the outer weld 24 between the base plate 22 and the frame 21 is located in the detection chamber 115, which allows for airtightness testing and troubleshooting of airtightness failure points of the inner weld between the base plate 22 and the frame 21.

[0094] Second, the third seal 14 is disposed between the second part 112 and the bottom surface of the frame 21.

[0095] With the height direction of the battery box 2 as the projection direction, the projection of the third seal 14 is located within the projection of the frame 21 of the battery box 2.

[0096] With the third seal 14 in this position, the outer weld 24 between adjacent side beams in the frame 21 is located in the detection chamber 115, thereby enabling the airtightness test and airtightness failure point investigation of the inner weld between adjacent side beams.

[0097] According to some embodiments of this application, the air inlet 114 is disposed in the second part 112, which serves to support the battery box 2. When placing the battery box 2, the air inlet 114 can be clearly avoided, reducing the risk of the air inlet 114 being blocked and improving the success of the air tightness test.

[0098] In this embodiment, the projection direction is the height direction of the battery box 2. The projection of the air inlet 114 is located between the projection of the second seal 13 and the projection of the third seal 14. When placing the battery box 2, the air inlet 114 can be avoided intuitively, reducing the risk of the air inlet 114 being blocked and improving the success of the air tightness test.

[0099] Secondly, the testing fixture can be an integral structure.

[0100] In this embodiment, the testing fixture may have a placement port, through which the battery box 2 can be inserted into the testing cavity 115. The sealing element provided on the inner wall of the testing cavity 115 can be squeezed to form a seal between the testing fixture and the battery box 2.

[0101] In related technologies, when welding the side beams of the frame using steel roll-formed profiles or aluminum extruded profiles, or when welding the frame to the base plate or the frame to the top cover, it is usually necessary to use sealing welds on the inner or outer sides to form a sealed space inside the casing. During the battery assembly process, the battery casing needs to be tested for airtightness, specifically the sealing welds on the casing, to determine the points of airtightness failure.

[0102] The airtightness failure points of the enclosure are usually located at the welds between the side beams of the frame, the welds between the frame and the bottom plate, and the welds between the frame and the top cover.

[0103] With technological advancements, when the sealing weld is located on the outer wall of the enclosure, the enclosure can be inflated, and external leak detection can be performed to determine airtightness and identify leak points. However, as the frame is given more and more structural functions, such as cover plate bolt connections, battery pack and vehicle body locking holes, and accessory mounting brackets, the number of sealing points on the outer area of ​​the frame increases, making it impossible to achieve a good seal.

[0104] To address these issues, related technologies consider moving the sealing weld to the inside of the battery housing, such as the inside of the frame. However, if the original sealing detection method is still used, the problem of not being able to pinpoint the leak point arises. During airtightness testing, gas entering the profile from a leak point on the inside of the battery housing may leak out from any gap outside the frame or machining feature point, making it impossible to trace and screen for leaks in the inner area of ​​the battery housing.

[0105] The battery testing equipment provided in this application, by setting up a testing fixture, can be sealed to the outer wall of the battery box 2 to form a testing chamber 115. When the testing chamber 115 is under positive pressure and there is an airtightness failure point in the battery box 2, air can be injected from the outside to the inside of the battery box 2, thereby exposing the sealing weld 23 inside the battery box 2 to the detectable space. The airtightness failure point of the sealing weld 23 can be detected from the inside of the battery box 2. The operation is simple, the structure is simple, and the cost is low.

[0106] According to some embodiments of this application, such as Figures 1-4 As shown, this application provides a battery testing device, including: a testing fixture and an inflation device. The testing fixture includes a first part 111, a second part 112, a first seal 12, a second seal 13 and a third seal 14.

[0107] During testing, the battery box 2 under test is placed on the second part 112. If the entire battery box 2 is being tested, the bottom plate 22 of the battery box 2 under test is pressed onto the third seal 14 on the second part 112. If only the frame 21 of the battery box 2 is being tested, the bottom surface of the frame 21 under test is pressed onto the third seal 14 on the second part 112.

[0108] Then, the first part 111 is placed on the battery box 2 under test, so that the first seal 12 on the first part 111 is pressed against the top surface of the battery box 2, and the bottom end of the first part 111 is pressed against the second seal 13. Finally, the locking assembly 15 is used to press the first part 111 and the second part 112 tightly against the top surface and bottom plate 22 of the battery box 2 under test, forming the detection cavity 115.

[0109] After the testing fixture and the battery box 2 under test are installed, the air inlet 114 is connected to the airtightness device. Upon starting the airtightness test, pressurized air is injected into the testing chamber 115 to create positive pressure. Gas can enter the sealing weld 23 through weld failure points and machining openings on the outside of the battery box 2. If there are no sealing failure points in the sealing weld 23, the airtightness device will pass the test. If there are sealing failure points in the sealing weld 23, the airtightness device will fail the test, and the airtightness failure points in the sealing weld 23 can be investigated using methods or equipment such as spraying foam water or a nitrogen-hydrogen detector.

[0110] Unless otherwise specified, all embodiments and optional embodiments of this application can be combined to form new technical solutions.

[0111] Unless otherwise specified, all technical features and optional technical features of this application may be combined to form new technical solutions.

[0112] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A battery detection device, characterized by, The detection tool comprises: a detection tool, which forms a placing cavity for placing a battery box and a gas inlet, a wall surface of the placing cavity is sealingly connected with an outer wall of the battery box to form a detection cavity, and the gas inlet is communicated with the detection cavity; a gas filling device connected with the gas inlet and used for filling gas into the detection cavity through the gas inlet.

2. The battery detection apparatus according to claim 1, characterized by, The detection tool comprises: a first part covering the battery box; a second part detachably connected with the first part, the first part, the second part and the battery box are sealingly connected to form the detection cavity, and the gas inlet is arranged on the first part or the second part.

3. The battery detection apparatus according to claim 2, characterized by The first part comprises a first wall and a second wall which are oppositely bent, the first wall is used for sealingly connecting with a top surface of the battery box, and the second wall is sealingly connected with the second part, the second part is used for sealingly connecting with a bottom surface of the battery box, and the gas inlet is arranged on the second part.

4. The battery detection apparatus according to claim 3, characterized by Further comprising a first sealing member, a second sealing member and a third sealing member, the first sealing member is arranged between the first wall and the top surface of the battery box, the second sealing member is arranged between the second wall and the second part, and the third sealing member is arranged between the second part and the bottom surface of the battery box.

5. The battery detection apparatus according to claim 4, characterized by In a projection direction of a height direction of the battery box, a projection of the third sealing member is located within a projection of a frame of the battery box, or the projection of the third sealing member is located within a projection of a bottom plate of the battery box.

6. The battery detection apparatus according to claim 4, characterized by In the projection direction of the height direction of the battery box, a projection of the gas inlet is located between a projection of the second sealing member and a projection of the third sealing member.

7. The battery testing apparatus of claim 2, wherein The detection tool further comprises a locking assembly, the locking assembly comprises a connecting piece and a pressing piece, the connecting piece extends along a distribution direction of the first part and the second part, the pressing piece is movably arranged on the connecting piece, the pressing piece is connected with the second part, and the pressing piece is connected with the first part.

8. The battery detection apparatus according to claim 7, characterized by The connecting piece and the pressing piece are screw-connected.

9. The battery testing apparatus of claim 2, wherein, The second part is further provided with a supporting leg, and the supporting leg is used for lifting a body of the second part.

10. The battery detection apparatus according to any one of claims 1-9, wherein, The detection tool has a detection port, and in a case where the battery box is placed in the placing cavity, in a projection direction of a height direction of the battery box, a projection of the detection port has an overlapping area with a projection of an inner cavity of the battery box.

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