Airtight testing device and energy storage device

Abstract

The utility model provides an air tightness testing device and an energy storage device, belonging to the technical field of batteries, the bottom of a battery pack is provided with a closed cavity formed by a large cold plate, a sealing strip and a bottom guard plate, the air tightness testing device comprises an air tightness testing channel, one end of the air tightness testing channel is communicated with the closed cavity; the airtightness testing structure is communicated with the other end of the airtightness testing channel; the channel sealing assembly is arranged at a channel opening of the air tightness test channel at the communication part of the air tightness test channel and the air tightness test structure and is used for opening when the air tightness test structure is communicated with the air tightness test channel and closing when the air tightness test structure is disconnected from the air tightness test channel; by means of the airtight testing device, airtight detection can be conducted on the closed cavity more effectively, and it is guaranteed that the airtight state of the closed cavity can be known in time.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to an airtight testing device and an energy storage device. Background Art

[0002] As environmental pollution becomes increasingly serious, how to reduce pollution emissions and improve our living environment has become an urgent problem to be solved, and the pollution emissions of traditional fuel vehicles using fossil fuels are also the first to be solved. Therefore, a lot of manpower and material resources have been invested in the development of electric vehicle technology. The energy supply of electric vehicles comes from power battery packs, so power battery pack technology is crucial for electric vehicles.

[0003] Most of the existing power battery packs use a large cold plate solution, firstly to improve the heating and cooling efficiency of the power battery pack, and secondly to reduce parts, that is, to reduce the pipe connections between small cold plates and small cold plates, reduce parts costs and manufacturing costs, and secondly, when the large cold plate is arranged at the bottom of the battery cell and module, it also acts as a structural part to provide support and support for the battery cell and module. As a functional part for heating and cooling the battery cells and modules in the battery pack, if the large cold plate is directly exposed to the outside world, its heating and cooling functions will be greatly reduced. At this time, the bottom guard plate at the bottom of the battery pack forms a closed cavity with the large cold plate, and is filled with some heat-insulating and protective materials, which can greatly improve the heating and cooling functions of the large cold plate and the protection function of the bottom guard plate against bumps and stone strikes.

[0004] However, how to perform airtightness detection on the closed cavity has become a technical problem that needs to be solved urgently by those skilled in the art. Utility Model Content

[0005] The utility model provides an airtightness testing device and an energy storage device, which are used to solve the defect in the prior art that the airtightness test cannot be performed on the closed cavity formed by the large cold plate, the sealing strip and the bottom guard plate.

[0006] In a first aspect, the utility model provides an airtight test device, wherein a closed cavity formed by a large cold plate, a sealing strip and a bottom guard plate is arranged at the bottom of the battery pack, and the airtight test device comprises:

[0007] An airtight test channel, one end of which is connected to the closed cavity;

[0008] An airtight test structure, connected to the other end of the airtight test channel;

[0009] A channel sealing assembly is arranged at the channel opening of the airtight test channel where the airtight test channel is connected to the airtight test structure, and is used to open when the airtight test structure is connected to the airtight test channel, and to close when the airtight test structure is disconnected from the airtight test channel.

[0010] According to an airtight testing device provided by the utility model, the channel sealing assembly includes:

[0011] A fixing member, detachably fixed to the airtight test channel;

[0012] A sealing member passes through one end of the fixing member and is elastically fixed to the passage opening, and is used for opening or closing the airtight test passage.

[0013] According to an airtight testing device provided by the utility model, the sealing member comprises:

[0014] A circular sealing cover, passing through the fixing member and sealing the passage opening;

[0015] The elastic member passes through the fixing member and is disposed between the circular sealing cover and the side wall of the airtight test channel, and is used for pressing the circular sealing cover against the channel opening.

[0016] According to an airtight testing device provided by the utility model, the fixing member comprises:

[0017] A central bolt, used to fix the sealing member at the passage opening;

[0018] A sealing ring is arranged in the sealing groove of the central bolt and seals the airtight test channel together with the sealing member.

[0019] According to an airtightness testing device provided by the utility model, the structure of the central bolt is a stepped structure;

[0020] The stepped structure includes a thick rod, a middle rod and a thin rod;

[0021] The thick rod and the middle rod are used to limit the seal, and the thin rod is used to be fixed on the side wall of the airtight test channel.

[0022] According to an airtight test device provided by the utility model, the airtight test structure comprises:

[0023] The test fixture is provided with a gas source end and a clamping end;

[0024] A clamping tooth, arranged at the clamping end, for clamping and communicating with the airtight test channel;

[0025] The supporting teeth are arranged at the clamping end and are used to open the channel sealing assembly when communicating with the airtight test channel.

[0026] According to an airtight test device provided by the utility model, the airtight test structure further includes:

[0027] A snap-fit ​​sealing ring is arranged at the snap-fit ​​end and is used to seal the connection after the snap-fit ​​connection.

[0028] According to an airtightness testing device provided by the utility model, the airtightness testing device is integrated on the water inlet and outlet modules.

[0029] According to an airtight testing device provided by the utility model, the device also includes:

[0030] A cover plate is detachably disposed on the airtight test channel and is used to seal the channel sealing assembly within the airtight test channel.

[0031] In a second aspect, the utility model also protects an energy storage device, including an airtight testing device as described in any one of the above items.

[0032] The utility model provides an airtight test device and an energy storage device, wherein a closed cavity formed by a large cold plate, a sealing strip and a bottom guard plate is arranged at the bottom of a battery pack, and the airtight test device comprises: an airtight test channel, one end of which is connected to the closed cavity; an airtight test structure, which is connected to the other end of the airtight test channel; a channel sealing component, which is arranged at the channel opening of the airtight test channel at the connection between the airtight test channel and the airtight test structure, and is used to open when the airtight test structure is connected to the airtight test channel, and to close when the airtight test structure is disconnected from the airtight test channel. The airtight test device can more effectively perform airtight detection on the closed cavity, thereby ensuring that the airtightness status of the closed cavity can be learned in time. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the present invention or the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0034] Figure 1 is a schematic diagram of the structure of the closed cavity provided in this embodiment;

[0035] Figure 2 is a schematic diagram of the internal structure of the airtight testing device provided in this embodiment;

[0036] Figure 3 is a schematic diagram of the internal structure of a partial airtightness testing device provided in this embodiment;

[0037] Figure 4 is an exploded view of the channel sealing assembly in 3;

[0038] Figure 5 yes Figure 4A schematic diagram of the structure of the fixing parts;

[0039] Figure 6 yes Figure 4 A schematic diagram of the structure of a circular sealing cover;

[0040] Figure 7 yes Figure 4 A schematic diagram of the structure of the elastic member in FIG.

[0041] Figure 8 is a schematic diagram of the airtight test structure provided in this embodiment;

[0042] Fig. 9 is with Figure 8 The interface diagram corresponding to the card connection terminal;

[0043] Fig.10 is a schematic diagram of a partial three-dimensional structure of the airtightness testing device provided in this embodiment;

[0044] Fig.11 yes Fig.10 A schematic diagram from another angle;

[0045] Fig.12 It is a partial exploded schematic diagram of the airtightness testing device provided in this embodiment.

[0046] Reference numerals:

[0047] 1. Airtight test channel; 2. Airtight test structure; 21. Air source end; 22. Snap-on teeth; 23. Support teeth; 24. Snap-on sealing ring; 3. Channel sealing assembly; 31. Fixing piece; 311. Center bolt; 3111. Thick rod; 3112. Middle rod; 3113. Thin rod; 312. Sealing ring; 32. Sealing piece; 321. Round sealing cover; 322. Elastic piece; 4. Cover plate; A. Large cold plate; B. Sealing strip; C. Bottom guard plate; D. Thermal insulation material; E. Closed cavity; F. Mounting bolt; G. Inlet and outlet modules. DETAILED DESCRIPTION

[0048] In order to make the purpose, technical solution and advantages of the utility model clearer, the technical solution of the utility model will be described clearly and completely in conjunction with the drawings in the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0049] When the airtightness problem occurs in the closed cavity E in the power battery pack, the following problems will occur: the insulation capacity of the large cold plate A is reduced, thereby reducing the heating and cooling functions of the battery pack. When the whole vehicle wades through water, liquid will enter the cavity and cannot be discharged, reducing the insulation safety of the battery pack. Corrosive liquid entering the cavity may cause immersion corrosion of the large cold plate A, reducing the life of the battery pack. If the leak point is larger, sand and pebbles enter the cavity, which will cause abnormal noise at the bottom of the battery pack. If the bottom guard plate C has damage or gaps that are not easy to detect, the protective function of the bottom guard plate C for the battery pack will be greatly reduced, reducing the safety of the battery pack. Therefore, the utility model uses an airtight testing device to perform an airtightness test on the closed cavity E, so that the current airtight state of the closed cavity E can be more clearly understood, and maintenance can be performed in time when airtightness problems occur.

[0050] Figure 1 is a schematic diagram of the structure of the closed cavity provided in this embodiment; Figure 2 It is a schematic diagram of the internal structure of the airtight testing device provided in this embodiment.

[0051] like Figure 1 As shown, a closed cavity E formed by a large cold plate A, a sealing strip B and a bottom guard plate C is provided at the bottom of the battery pack. Specifically, the bottom guard plate C is installed on the lower shell by using mounting bolts F, and the bottom guard plate C and the large cold plate A are sealed by using sealing strips B to form a closed cavity. The thermal insulation and protective material D is filled in the gap of the closed cavity E to provide thermal insulation and structural protection for the large cold plate A. The bottom surface of the bottom guard plate C is sprayed with primer, which also plays a role in thermal insulation and stone impact prevention.

[0052] like Figure 2 As shown, this embodiment provides an airtight testing device, comprising:

[0053] An airtight test channel 1, one end of which is connected to the closed cavity E;

[0054] An airtight test structure 2, connected to the other end of the airtight test channel 1;

[0055] The channel sealing component 3 is arranged at the channel opening of the airtight test channel where the airtight test channel 1 is connected to the airtight test structure 2, and is used to open when the airtight test structure 2 is connected to the airtight test channel 1, and to close when the airtight test structure 2 is disconnected from the airtight test channel 1.

[0056] In a specific implementation process, the airtight test channel 1 is connected to the closed cavity E, and the airtight test is connected to the airtight test structure 2, the airtight test structure 2 is connected to the airtight detector or other instruments, and the closed cavity E is inflated through the airtight test interface. The inflation process is that when the airtight test structure 2 is connected to the airtight test channel 1, the channel sealing component 3 located between the airtight test channel 1 and the airtight test structure 2 is opened, and at this time, the inflation gas smoothly enters the closed cavity E. When the internal pressure of the closed cavity E reaches the preset requirement, the inflation is stopped, and the airtight test structure 2 is disconnected from the airtight test channel 1. At this time, the channel sealing component 3 is closed, and the connection between the gas test channel 1 and the outside world is closed, so that the closed cavity E and the airtight test channel 1 are an integral closed space, ensuring the overall airtightness. During the next airtightness test, the airtightness detector or other equipment is connected to the closed cavity E through the airtightness test structure 2. At this time, the airtightness detector can determine the pressure in the closed cavity E by reading the numerical value. After comparing it with the pressure after the previous inflation, it can determine whether the closed cavity E has a leak.

[0057] The entire airtight test device can be tested repeatedly for multiple times, and by opening and closing the channel sealing assembly 3, the operation of inflating the closed cavity E can be effectively completed. The closed cavity E can be tested quickly and effectively, further improving the safety and performance of the power battery.

[0058] Figure 3 is a schematic diagram of the partial structure of the airtightness testing device provided in this embodiment, Figure 4 This is an exploded view of the channel sealing assembly in 3. Figure 5 yes Figure 4 Schematic diagram of the structure of the fixing parts in FIG. Figure 6 yes Figure 4 The schematic diagram of the structure of the circular sealing cover in FIG. Figure 7 yes Figure 4 Schematic diagram of the structure of the elastic member.

[0059] like Figure 3 As shown, the channel sealing assembly 3 includes: a fixing member 31, which is detachably fixed on the airtight test channel 1;

[0060] The sealing member 32 passes through one end of the fixing member 31 and is elastically fixed on the channel opening to open or close the airtight test channel 1 .

[0061] Specifically, the function of the fixing member 31 is to fix the sealing member 32 stably and firmly on the airtight test channel 1, so that the sealing member 32 can maintain a relatively stable position when it is closed or opened. The function of the sealing member 32 is to ensure that it can be opened to inflate the closed cavity E. When the inflation is completed, the inflation port can be effectively sealed to ensure that the closed cavity E and the airtight test channel 1 are in a closed state. Due to the mutual cooperation between the fixing member 31 and the sealing member 32, it is ensured that the inflation port can be accurately sealed at the beginning and end of inflation. At the same time, during the inflation process, the position of the sealing member 32 can also be fixed, and it will not cause poor inflation effect or poor inflation port sealing effect due to random shaking.

[0062] like Figure 4-Figure 7 As shown, the sealing member 32 includes: a circular sealing cover 321, which passes through the fixing member 31 and seals the channel opening;

[0063] The elastic member 322 passes through the fixing member 31 and is disposed between the circular sealing cover 321 and the side wall of the airtight test channel 1 , so as to press the circular sealing cover 321 against the channel opening.

[0064] Specifically, the front of the circular sealing cover 321 is designed with a sealing groove and a sealing ring 312. The radial dimension of the sealing ring 312 is larger than the front circular hole at the air inlet of the airtight test structure 2, ensuring that the circular sealing cover 321 can complete the sealing of the inflation port. The elastic member 322 is used to hold the circular sealing cover 321 against the airtight test channel 1 to ensure good airtightness between the circular sealing cover 321 and the airtight test channel 1. The elastic member 322 can be a spring or the like.

[0065] The fixing member 31 includes: a central bolt 311, which is used to fix the sealing member 32 at the channel opening; a sealing ring 312, which is arranged in the sealing groove of the central bolt 311 and seals the airtight test channel 1 together with the sealing member 32. Among them, the front of the central bolt is designed with an inner hexagonal groove, which is convenient for tools to assemble and disassemble. The inner flange surface of the central bolt 311 is designed with a sealing groove and a sealing ring 312; the structure of the central bolt 311 is a stepped structure; the stepped structure includes a thick rod 3111, a middle rod 3112 and a thin rod 3113; the thick rod 3111 and the middle rod 3112 are used to limit the sealing member 32, and the thin rod 3113 is used to be fixed at the threaded hole of the sealing groove on the side wall of the airtight test channel 1. After the central bolt 311 is installed, the spring is in a compressed state, the circular sealing cover 321 is lifted by the spring, and the stepped surface of the circular sealing cover 321 can fit with the inner flange of the central bolt 311, and the sealing is achieved under the action of the sealing ring 312.

[0066] The spring and the circular sealing cover 321 are sleeved on the middle rod 3112 of the center bolt 311, and the circular sealing cover 321 is squeezed on the thick rod 3111 of the center bolt 311 by the spring. Since the spring is always in a compressed state, each circular sealing cover 321 fits tightly, ensuring that the airtight test channel 1 is always in a sealed state. When inflation is required, the circular sealing cover 321 is pushed by an external force, and the spring is further compressed, so that a gap is formed between the circular sealing ring 312 and the airtight test channel 1, and the gas successfully enters the closed cavity E. After inflation is completed, the circular sealing cover 321 loses the external force, and the spring at this time will relax, and the circular sealing cover 321 will be squeezed again on the airtight test channel 1 to complete the sealing of the closed cavity E.

[0067] Figure 8 is a schematic diagram of the airtight test structure provided in this embodiment, Fig. 9 is with Figure 8 The interface diagram corresponding to the card connection terminal;

[0068] like Figure 8 and Fig. 9 As shown, the airtight test structure 2 provided in this embodiment includes:

[0069] The test fixture is provided with a gas source end 21 and a clamping end;

[0070] The engaging teeth 22 are arranged at the engaging end and are used for engaging and communicating with the airtight test channel 1;

[0071] The supporting teeth 23 are arranged at the clamping end and are used to open the channel sealing assembly 3 when communicating with the airtight test channel 1;

[0072] The clamping sealing ring 24 is arranged at the clamping end and is used to seal the connection after the clamping connection.

[0073] Specifically, the snap-in end of the airtight test structure is inserted into the circular hole at the interface 12 of the airtight test channel 1, and the snap-in tooth 22 is rotated to complete the snap-in connection with the snap-in structure, and the snap-in tooth 22 is connected to the corresponding position of the airtight test channel 1 to form a complete inflation channel. The circular hole sealing ring 312 at the interface 12 forms a sealing structure with the inner wall of the airtight test circular hole. As the test tool is pressed in, the supporting tooth 23 will contact and lift the circular sealing cover 321 to achieve the connection between the air source end 21 and the closed cavity E. In addition, this design method lifts the circular sealing cover 321 by the pressing action, and the structural design is simple and reliable, and is not limited by special operating techniques. At the same time, since the circular sealing cover 321 is supported by the compressed spring, this reaction force will be transmitted to the snap-in tooth 22 of the airtight test tool, so as to achieve the fit between the tool snap-in tooth 22 and the snap-in part of the test circular hole, avoid the shaking and displacement of the snap-in end during the airtight test, and improve the stability and reliability of the airtight test. After the test is completed and the test fixture is removed, the circular sealing cover 321 is re-secured on the side wall of the airtight test channel 1 under the action of the spring to form a complete sealed space. Figure 1 The diagram shows a circular sealing cover 321 being lifted up, and an inflation test is performed at this time. Figure 3 This is a schematic diagram without the inflation test, in which the circular sealing cover 321 is tightly fitted to the side wall of the airtight test channel 1 .

[0074] Fig.10 is a schematic diagram of a partial three-dimensional structure of the airtightness testing device provided in this embodiment, Fig.11 yes Fig.10 Schematic diagram from another angle.

[0075] like Fig.10 and Fig.11 As shown, the airtight test device in this embodiment is integrated on the water inlet and outlet module G. The water inlet and outlet module G is integrated with the large cold plate A, which reduces the pipeline connection, reduces the parts cost and the risk of pipeline connection failure, and improves the reliability of cooling and heating of the large cold plate A. The left and right interfaces of the water inlet and outlet module G are the coolant inlet and outlet. These two pipelines pass through the upper plate of the large cold plate A and communicate with the flow channel formed by the upper plate of the large cold plate A and the flow channel plate to exchange and flow the coolant. The middle part is the airtight test channel 1 of the bottom guard plate C. The pipeline passes through the large cold plate A and communicates with the closed cavity E formed by the large cold plate A and the bottom guard plate C.

[0076] By integrating the airtight test device on the water inlet and outlet module G, the overall design is facilitated, and the one-piece design can also save space.

[0077] Fig.12 It is a partial exploded schematic diagram of the airtightness testing device provided in this embodiment.

[0078] like Fig.12 As shown, the airtight testing device in this embodiment further includes:

[0079] The cover plate 4 is detachably disposed on the airtight test channel 1 and is used to seal the channel sealing assembly 3 in the airtight test channel 1 .

[0080] Specifically, by designing the sealing groove and the upper cover sealing ring 312, the cover plate 4 can be installed on the airtight test channel 1 integrated with the water inlet and outlet module G using small screws, and the airtight test channel 1 is sealed under the action of the upper cover sealing ring 312. The cover plate 4 is also convenient for observation during the installation of the center bolt 311, which improves the installation efficiency of the center bolt 311 and related components, and also facilitates the placement and removal of the circular sealing cover 321.

[0081] Based on the same general utility model concept, the utility model also protects an energy storage device, including an airtight testing device as described in any of the above embodiments, and the energy storage device includes a vehicle, an operating machine, and the like.

[0082] The device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Ordinary technicians in this field can understand and implement it without paying creative labor.

[0083] Through the description of the above implementation methods, those skilled in the art can clearly understand that each implementation method can be implemented by means of software plus a necessary general hardware platform, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solution is essentially or the part that contributes to the prior art can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a disk, an optical disk, etc., including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or some parts of the embodiments.

[0084] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the utility model.

Claims

1. An airtight testing device, characterized in that: The bottom of the battery pack is provided with a closed cavity formed by a large cold plate, a sealing strip and a bottom guard plate. The airtight test device includes: An airtight test channel, one end of which is connected to the closed cavity; An airtight test structure, connected to the other end of the airtight test channel; A channel sealing assembly is arranged at the channel opening of the airtight test channel where the airtight test channel is connected to the airtight test structure, and is used to open when the airtight test structure is connected to the airtight test channel, and to close when the airtight test structure is disconnected from the airtight test channel.

2. The airtight testing device according to claim 1, characterized in that: The channel sealing assembly comprises: A fixing member, detachably fixed to the airtight test channel; A sealing member passes through one end of the fixing member and is elastically fixed to the passage opening, and is used for opening or closing the airtight test passage.

3. The airtight testing device according to claim 2, characterized in that: The sealing member comprises: A circular sealing cover, passing through the fixing member and sealing the passage opening; The elastic member passes through the fixing member and is arranged between the circular sealing cover and the side wall of the airtight test channel, and is used for pressing the circular sealing cover against the channel opening.

4. The airtight testing device according to claim 2, characterized in that: The fixing member comprises: A central bolt, used to fix the sealing member at the passage opening; The sealing ring is arranged in the sealing groove of the central bolt and seals the airtight test channel together with the sealing member.

5. The airtight testing device according to claim 4, characterized in that: The structure of the central bolt is a stepped structure; The stepped structure includes a thick rod, a middle rod and a thin rod; The thick rod and the middle rod are used to limit the seal, and the thin rod is used to be fixed on the side wall of the airtight test channel.

6. The airtight testing device according to claim 1, characterized in that: The airtight test structure comprises: The test fixture is provided with an air source end and a clamping end; A clamping tooth, arranged at the clamping end, for clamping and communicating with the airtight test channel; The supporting teeth are arranged at the clamping end and are used to open the channel sealing assembly when communicating with the airtight test channel.

7. The airtight testing device according to claim 6, characterized in that: The airtight test structure also includes: A snap-fit ​​sealing ring is arranged at the snap-fit ​​end and is used to seal the connection after the snap-fit ​​connection.

8. The airtightness testing device according to any one of claims 1 to 7, characterized in that: The airtightness testing device is integrated on the water inlet and outlet modules.

9. The airtightness testing device according to any one of claims 1 to 7, characterized in that: Also includes: A cover plate is detachably disposed on the airtight test channel and is used to seal the channel sealing assembly within the airtight test channel.

10. An energy storage device, characterized in that: Comprising the airtight testing device as described in any one of claims 1-9.

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