Diaphragm type battery box

Abstract

The utility model provides a diaphragm type battery box which comprises a box body, a battery module and a diaphragm structure, and the battery module is arranged in the box body; the diaphragm structure is mounted outside the battery module, the diaphragm structure, the battery module and the box body respectively form a cavity, and the diaphragm structure adjusts the volume of the cavity formed among the first diaphragm, the second diaphragm and the box body according to the air pressure difference between the inside and the outside of the box body. The diaphragm structure is arranged outside the box body, the diaphragm structure is flexible and deformable, and the volume of the cavity formed between the first diaphragm and the second diaphragm can be adjusted according to the air pressure difference between the interior and the exterior of the box body, so that air balance inside and outside the box body is adjusted. According to the battery box, a balance valve is replaced by the diaphragm structure, and circulation of gas inside and outside the box body is prevented, so that the problems of condensation, corrosion, insulation, poor high-voltage and low-voltage contact and high-voltage sparking caused by the use of the balance valve in the battery box are avoided.

Description

Technical Field

[0001] This utility model belongs to the field of battery technology, and in particular relates to a diaphragm-type battery box. Background Technology

[0002] During the charging and discharging process, new energy vehicle batteries produce gases such as hydrogen and oxygen. These gases cause the internal pressure of the battery to rise. To maintain the pressure balance inside and outside the battery pack, a balancing valve is commonly used for venting. The balancing valve usually opens when the internal pressure of the battery pack exceeds a set value and closes when the internal pressure decreases. However, during the venting process, moisture can also enter the battery pack. In low-temperature and high-humidity environments, condensation can form inside the battery pack. Long-term use can easily lead to corrosion of internal electrical connections, insulation failure, and even poor high and low voltage contact, high-voltage arcing, and other malfunctions. At the same time, the gas inside the battery pack can change volume due to factors such as temperature and altitude, causing changes in the internal pressure of the battery pack. In this case, relying on the balancing valve to balance the pressure is not very efficient. Utility Model Content

[0003] In view of the shortcomings of the prior art described above, the purpose of this utility model is to provide a diaphragm-type battery box to solve the problem that the use of a balance valve to maintain the air pressure balance inside and outside the battery pack in the prior art can easily cause a series of failures due to the battery pack being in a high humidity environment for a long time.

[0004] To achieve the above and other related objectives, this utility model provides a diaphragm-type battery box, comprising:

[0005] Box;

[0006] The battery module is installed inside the housing;

[0007] A diaphragm structure is installed outside the battery module, and the diaphragm structure, the battery module, and the housing respectively form cavities.

[0008] The diaphragm structure adjusts the volume of the cavity formed between the diaphragm structure and the box body according to the air pressure difference between the inside and outside of the box.

[0009] Furthermore, the separator includes a first separator installed on the top of the battery module and a second separator installed on the bottom of the battery module.

[0010] Furthermore, a reinforcing bracket is provided on the side of the first diaphragm away from the battery module, the reinforcing bracket is in contact with the edge of the first diaphragm, and the reinforcing bracket is connected to the housing.

[0011] Furthermore, the reinforcing bracket is provided with multiple limiting brackets at intervals; the first diaphragm is provided with multiple limiting blocks at intervals on the side near the battery module.

[0012] Furthermore, a support member is provided at the bottom of the battery module; the support member is used to provide support for the battery module and is connected to the inner wall of the housing.

[0013] Furthermore, the support member is a water-cooled plate, and the water-cooled plate is provided with at least one first vent hole; a bottom guard plate is provided on the side of the second diaphragm away from the support member, the bottom guard plate is connected to the box body, and at least one second vent hole is provided on the bottom guard plate.

[0014] Furthermore, it also includes a pressure relief structure installed on the casing, which is used to release the gas inside the casing when the gas inside the diaphragm battery box reaches a preset value.

[0015] Furthermore, the pressure relief structure includes a locking block, a pressure-bearing block, a latch, a first connecting groove, and a second connecting groove. The first connecting groove is provided along the thickness direction of the housing, and the second connecting groove is provided along the height direction of the housing. The first connecting groove connects the second connecting groove to the inner wall of the housing. The pressure-bearing block is slidably installed in the first connecting groove. A moving groove for the locking block to move up and down is provided within the pressure-bearing block, and the locking block is movably connected to the pressure-bearing block. The latch is located at the top of the locking block, a latch is provided in the moving groove, and a locking hook is provided on the locking block. After the locking hook is locked with the latch, the bottom of the latch contacts the top of the second connecting groove.

[0016] Furthermore, an elastic element is provided on the pressure block along the sliding direction of the pressure block, and the elastic element is connected to the housing and / or battery module.

[0017] Furthermore, the top of the latch is provided with a first guide slope, and the hook is provided with a second guide slope.

[0018] As described above, this utility model has the following beneficial effects: By setting a diaphragm structure outside the battery module, this application provides a flexible and deformable diaphragm structure that adjusts the volume of the cavity formed between the diaphragm structure and the housing according to the pressure difference between the inside and outside of the housing, thereby regulating the gas balance inside and outside the housing. This application uses a diaphragm structure instead of a balance valve, preventing the flow of gas between the inside and outside of the housing. Therefore, it avoids the problems of condensation, corrosion, insulation issues, poor high and low voltage contact, and high-voltage arcing that can occur with battery boxes using balance valves. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the diaphragm battery box provided by this utility model;

[0020] Figure 2 for Figure 1 A schematic diagram of the exploded structure;

[0021] Figure 3 for Figure 1 Top view;

[0022] Figure 4 for Figure 3 Sectional view along the middle AA;

[0023] Figure 5 for Figure 3 A sectional view along the middle edge BB;

[0024] Figure 6 This is a structural diagram of the bottom protective plate;

[0025] Figure 7 This is a schematic diagram of the water-cooled plate structure;

[0026] Figure 8 This is a schematic diagram of the structure of the first diaphragm from below;

[0027] Figure 9 Schematic diagram of the pressure relief structure in the locked state;

[0028] Figure 10 This is a schematic diagram of the structure before or after the pressure relief mechanism is locked.

[0029] Figure 11 This is a schematic diagram of the initial state of the first and second diaphragms;

[0030] Figure 12 This is a schematic diagram showing the compressed state of the first and second diaphragms;

[0031] Figure 13 This is a schematic diagram showing the expansion state of the first and second diaphragms.

[0032] Label Explanation

[0033] 1-Bottom protective plate, 11-Second vent, 2-Second diaphragm, 3-Water-cooled plate, 31-First vent, 4-Box body, 41-First connecting groove, 42-Second connecting groove, 43-First boss, 5-Battery module, 6-First diaphragm, 7-Reinforcing bracket, 71-Limiting bracket, 72-Limiting block, 8-Pressure relief structure, 80-Spring, 81-Locking block, 82-Pressure-bearing block, 83-Latch, 84-Moving groove, 85-Lock, 86-Locking hook, 87-Second boss, 88-First guide slope, 89-Second guide slope. Detailed Implementation

[0034] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification.

[0035] It should be understood that the structures, proportions, sizes, etc., illustrated in the accompanying drawings of this specification are only for illustrative purposes to aid those skilled in the art and are not intended to limit the implementation of this utility model. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effects and objectives of this utility model, should still fall within the scope of the technical content disclosed in this utility model. Furthermore, the terms such as "upper," "lower," "left," "right," "middle," and "one" used in this specification are merely for clarity of description and are not intended to limit the scope of implementation of this utility model. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of implementation of this utility model.

[0036] In order to describe this utility model in detail, the following is a specific description of a diaphragm-type battery box provided by this utility model.

[0037] like Figures 1 to 10 As shown, this utility model provides a diaphragm-type battery box, including a box body 4, a battery module 5 and a diaphragm structure. The diaphragm structure is installed on the outside of the battery module 5, which is equivalent to the diaphragm structure wrapping the battery module 5.

[0038] In some embodiments, the diaphragm structure includes a first diaphragm 6 mounted on top of the battery module 5 and a second diaphragm 2 mounted on the bottom of the battery module 5. The battery module 5 is installed inside a housing 4, and the first diaphragm 6 and the second diaphragm 2 are respectively mounted on both sides of the housing 4. A cavity is formed between the first diaphragm 6, the second diaphragm 2, and the housing 4, which means that the first diaphragm 6, the second diaphragm 2, and the housing 4 enclose the battery module 5. The edges of the first diaphragm 6 and the second diaphragm 2 are connected to the housing 4 by bolts.

[0039] The first diaphragm 6 and the second diaphragm 2 are made of flexible materials. The first diaphragm 6 and the second diaphragm 2 can adjust the volume of the cavity formed between the first diaphragm 6, the second diaphragm 2, and the housing 4 according to the pressure difference between the inside and outside of the housing 4. When there is a temperature difference between the inside and outside of the housing 4, the temperature change will also cause a pressure difference between the inside and outside of the housing 4. Therefore, regardless of whether there is a pressure difference or a temperature difference between the inside and outside of the housing 4, the volume of the cavity formed between the first diaphragm 6, the second diaphragm 2, and the housing 4 will be adjusted to balance the pressure inside and outside of the battery pack.

[0040] In some embodiments, the first diaphragm 6 and the second diaphragm 2 are made of silicone rubber or similar polymer materials with certain elasticity and high thermal insulation properties. When the battery box is in a high-temperature or low-temperature environment, due to the strong thermal insulation properties of the diaphragm material and the high sealing properties of the structure, the operation of the battery cells and other electrical components inside the battery box is protected from interference and influence by the external ambient temperature, and the battery box can be precisely controlled by the thermal management system.

[0041] In some embodiments, the box 4 is a U-shaped structure, with one side of the box 4 being closed and the other side being open.

[0042] The first diaphragm 6 is installed on top of the battery module 5. After the battery box is installed on the vehicle body, the first diaphragm 6 comes into contact with the vehicle body components. The bottom of the battery box is located at the bottom of the vehicle body, which is essentially exposed.

[0043] To prevent excessive deformation of the first diaphragm 6 and the second diaphragm 2, a reinforcing bracket 7 was added to the edge of the first diaphragm 6, and a bottom protective plate 1 was installed at the bottom of the second diaphragm 2. The reinforcing bracket 7 is a hollow frame that presses and fixes the edge of the first diaphragm 6 to the housing 4. Similarly, the bottom protective plate 1 also presses and fixes the edge of the second diaphragm 2 to the housing 4. Figure 2 As shown, the bottom protective plate 1 not only fixes the second diaphragm 2 but also protects it, preventing the second diaphragm 2 from being scratched or torn.

[0044] The top of the first diaphragm 6 is located inside the vehicle body. Therefore, to prevent damage to the first diaphragm 6, multiple limiting brackets 71 are also provided on the top of the reinforcing bracket 7. The two ends of the limiting brackets 71 are connected to the reinforcing bracket 7. The limiting brackets 71 can not only protect the first diaphragm 6, but also save materials and reduce the weight of the entire battery box compared to the solution of using a limiting plate to protect the entire first diaphragm 6.

[0045] When there is a pressure difference and / or temperature difference between the inside and outside of the housing 4, the edges of the first diaphragm 6 are pressed down because it is soft. When the first diaphragm 6 deforms, the deformation is greatest in the middle, forming an arch. This results in a large deformation in the middle and a smaller deformation at the edges, leading to greater force on the edges and increasing the likelihood of breakage. To limit excessive deformation in the middle of the first diaphragm 6, a limiting block 72 is provided. The limiting block 72 can be located on the side of the first diaphragm 6 away from the battery module 5; in some embodiments, it is preferred to be located on the side of the first diaphragm 6 closer to the battery module 5. The limiting block 72 effectively divides the entire first diaphragm 6 into multiple regions, thus limiting the expansion and deformation of the first diaphragm 6, reducing the deformation at the very center. The limiting block 72 is made of a material slightly harder than the first diaphragm 6 and can be adhered to the first diaphragm 6.

[0046] like Figure 8 As shown, in some embodiments, the multiple limiting blocks 72 are evenly arranged, and the two ends of the limiting blocks 72 do not exceed the width of the first diaphragm 6. That is, after the first diaphragm 6 is installed, the two ends of the limiting blocks 72 are not connected to the reinforcing bracket 7.

[0047] The second diaphragm 2 is constrained and protected by the bottom protective plate 1. To allow the second diaphragm 2 to adjust the volume of the cavity according to the pressure difference and / or temperature difference between the inside and outside of the housing 4, at least one second vent hole 11 is provided on the bottom protective plate 1. The second vent hole 11 allows the bottom of the second diaphragm 2 to communicate with the atmosphere.

[0048] In some embodiments, the battery modules 5 can be interconnected, and the battery modules 5 are connected to the inner wall of the housing 4, so that both sides of the housing 4 can be designed as open. Alternatively, a support member can be provided at the bottom of the housing 4 to support the battery modules 5. The support member can be multiple spaced strips or a single plate. If the support member is a strip, the distance between adjacent strips forms a first vent 31; if the support member is a plate, multiple first vents 31 are provided on the support member. The first vents 31 allow communication between the gas inside the housing 4 and the second diaphragm 2.

[0049] The first vent 31 connects the inner surface of the second diaphragm 2 to the interior of the housing 4, and the second vent 11 connects the outer surface of the second diaphragm 2 to the outside. This allows for the adjustment of the gas balance inside the housing 4 through the deformation of the second diaphragm 2. The number of first vents 31 and second vents 11 can be the same or different. Similarly, the positions of the first vents 31 and second vents 11 relative to the second diaphragm 2 can be the same or different.

[0050] In some embodiments, the support is a water-cooled plate 3, which not only provides support for the battery module 5 but also regulates the temperature of the battery module 5. For example, Figure 7 As shown, the first vent 31 can be evenly spaced along the middle of the water-cooled plate 3.

[0051] Specifically, the inner wall of the housing 4 is provided with a first protrusion 43, and the edge of the water-cooling plate 3 is located within the first protrusion 43. In some embodiments, in the cross-sectional view of the housing 4, the width of the upper part of the housing 4 above the first protrusion 43 is smaller than the width of the lower part of the first protrusion 43, and the water-cooling plate 3 can be located at the lower part of the first protrusion 43, that is, the shape of the first protrusion 43 is as follows. Figure 5 As shown, it is shaped like a "┐". In some other embodiments, the width of the upper part of the housing 4 of the first boss 43 is greater than the width of the lower part of the first boss 43, and the water-cooling plate 3 is located on the first boss 43.

[0052] According to the ideal gas law PV = nRT, where P is pressure, V is gas volume, T is temperature, n is the amount of substance of the gas, and R is the molar gas constant. Figure 11 The diagram shows the initial states of the first diaphragm 6 and the second diaphragm 2. The amount of gas, n, remains constant. When the battery box changes from a normal temperature environment to a low temperature environment, the temperature outside the battery box is lower than the temperature inside, causing T to decrease. To keep p constant, V will decrease. Therefore, the first diaphragm 6 will deform towards the second diaphragm 2, and the second diaphragm 2 will deform towards the first diaphragm 6, as shown. Figure 12 As shown, this reduces the volume of the cavity formed between the first diaphragm 6, the second diaphragm 2, and the housing 4. Similarly, when the battery box moves from a high-altitude region to a low-altitude region, the temperature T remains constant while the pressure P increases. To maintain balance, the gas volume V decreases, thus balancing the gas pressure inside and outside the battery box.

[0053] When the battery box changes from a normal temperature environment to a high temperature environment, the temperature T increases while the pressure P remains constant. Therefore, the volume V increases with the increase of temperature T, and the first diaphragm 6 and the second diaphragm 2 will change from... Figure 11 become Figure 13 This increases the internal volume to maintain pressure balance inside and outside the battery pack. Similarly, when the battery pack moves from a low-altitude area to a high-altitude area, the temperature T remains constant, but the pressure P decreases, so the volume V will increase to maintain equilibrium.

[0054] When a cell in the battery pack malfunctions, the internal temperature rises, causing the volume V to increase. However, if a cell experiences thermal runaway, even if the first diaphragm 6 and the second diaphragm 2 deform to their maximum extent, they cannot maintain balance, requiring pressure relief. Traditionally, an explosion-proof valve is installed on each cell, which effectively removes gas in the event of a single cell's thermal runaway. However, when multiple cells experience thermal runaway sequentially, the runaway products from the earlier failed cells can easily clog the outlet of the explosion-proof valve, preventing the effective removal of runaway products from the battery pack and increasing the internal pressure, potentially leading to an explosion. Therefore, this application provides a first connecting groove 41 along the thickness direction of the housing 4 and a second connecting groove 42 along the height direction of the housing 4. The first connecting groove 41 and the second connecting groove 42 are interconnected. In this embodiment, the thickness direction is as follows: Figure 5 The horizontal and vertical directions are as follows Figure 5 The vertical direction.

[0055] In some embodiments, in order to prevent the air pressure inside the housing 5 from being too high, a pressure relief structure is installed on the housing 5. When the air pressure inside the housing 5 exceeds a preset value, the pressure relief structure opens to release the gas from the housing 5, so that the inside and outside of the housing 5 reach equilibrium.

[0056] A pressure relief structure 8 is installed in the first connecting slot 41 and the second connecting slot 42. Under normal circumstances, the pressure relief structure 8 blocks the second connecting slot 42, isolating the inside of the housing 4 from the outside. When the battery cell inside the housing 4 runs out of control, the pressure relief structure 8 is opened, connecting the inside of the housing 4 with the outside through the second connecting slot 42 and the first connecting slot 41, forming a pressure relief channel to discharge thermal runaway products and prevent the inside of the housing 4 from running out of control.

[0057] The pressure relief structure 8 includes a locking block 81, a pressure-bearing block 82, and a latch 83. The pressure-bearing block 82 is slidably installed in the first connecting groove 41, such as... Figure 9 and Figure 10 As shown, the first connecting groove 41 extends outward from the inner wall of the housing 4 without penetrating through it. The pressure block 82 can slide within the first connecting groove 41. The height of the pressure block 82 can be the same as the height of the first connecting groove 41, or it can be lower.

[0058] The pressure block 82 has a moving groove 84 for the locking block 81 to move up and down, meaning the middle of the pressure block 82 is hollow and the overall structure is U-shaped. The locking block 81 is movably connected to the pressure block 82, the latch 83 is located on the top of the locking block 81, the moving groove 84 has a latch 85, and the locking block 81 has a locking hook 86; after the locking hook 86 and the latch 85 are locked together, the bottom of the latch 83 contacts the top of the second connecting groove 42.

[0059] Under normal circumstances, the locking block 81 is connected to the pressure block 82, the locking hook 86 is hooked by the latch 85, the locking block 81 cannot be moved out, and the latch 83 blocks the second connecting groove 42, thus isolating the inside of the housing 4 from the outside. When thermal runaway occurs inside the housing 4, and the deformation of the first diaphragm 6 and the second diaphragm 2 can no longer maintain equilibrium, the pressure block 82 is pushed by the gas towards the outer wall of the housing 4. The position of the locking block 81 remains unchanged, the pressure block 82 moves, the locking hook 86 separates from the latch 85, and under the action of air pressure, the locking block 81 is ejected, and the airflow inside the housing 4 is discharged through the first connecting groove 41 and the second connecting groove 42. To ensure sealing, a sealing ring can be provided at the bottom of the latch 83.

[0060] The first diaphragm 6 and the reinforcing bracket 7 are provided with perforations at positions corresponding to the second connecting groove 42. After the locking block 81 passes through the perforation, the bottom of the latch 83 contacts the reinforcing bracket 7. In order to prevent the pressure block 82 from moving under normal conditions, a second boss 87 is provided between the latch 83 and the locking block 81. After the locking block 81 is locked with the latch 85, the bottom of the second boss 87 contacts the top of the pressure block 82.

[0061] In some embodiments, to prevent the pressure block 82 from moving and to keep the locking hook 86 and the latch 85 from moving relative to each other, an elastic element is connected to the pressure block 82. In some embodiments, the elastic element is a spring 80. The spring 80 only needs to contact the pressure block 82, or it can be welded together.

[0062] Spring 80 can be positioned on the side of the pressure block 82 away from the battery module 5. One end of spring 80 is connected to the pressure block 82, and the other end is connected to the inner wall of the housing 4, thus the latch 85 is positioned on the side of the moving groove 84 away from the battery module 5. Under normal circumstances, after the latch 86 and the latch 85 are locked together, the spring 80 is compressed, and the spring 80 applies a force towards the battery module 5 to the pressure block 82, thereby locking the latch 85 and the latch 86 together.

[0063] Alternatively, a spring 80 can be provided on the side of the pressure block 82 facing the battery module 5. One end of the spring 80 is connected to the pressure block 82, and the other end is connected to the battery module 5. The tension of the spring 80 pulls the pressure block 82 toward the battery module, thereby locking the latch 85 and the hook 86.

[0064] To ensure smooth descent of the locking hook 86 upon contact, a first guide ramp 88 is provided on the top of the locking buckle 85, and a second guide ramp 89 is provided on the locking hook 86. Upon initial contact, the second guide ramp 89 and the first guide ramp 88 cooperate to allow the locking block 81 to descend smoothly.

[0065] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. A battery compartment of the diaphragm type, characterized in that, The application relates to a battery box. The application relates to a battery box. The application relates to a battery box. The application relates to a battery box. The application relates to a battery box.

2. The battery box of claim 1, wherein, The application relates to a battery box.

3. The battery box of claim 2, wherein, The application relates to a battery box.

4. The battery box of claim 3, wherein The application relates to a battery box.

5. The battery box of claim 2, wherein, The application relates to a battery box.

6. The battery box of claim 5, wherein, The application relates to a battery box.

7. The battery box of any one of claims 1-6, wherein, The application relates to a battery box.

8. The battery box of claim 7, wherein, The application relates to a battery box.

9. The battery box of claim 8, wherein, The application relates to a battery box.

10. The battery box of claim 9, wherein, The application relates to a battery box. The application relates to a battery box. The application relates to a battery box. The application relates to a battery box. The application relates to a battery box. The application relates to a battery box. The application relates to a battery box. The application relates to a battery box. The application relates to a battery box. The application relates to a battery box. The application relates to a battery box. The application relates to a battery box. The application relates to a battery box. The application relates to a battery box. The application relates to a battery box. The application relates to a battery box. The application relates to a battery box. The application relates to a battery box. The application relates to a battery box. The application relates to a battery box. The application relates to a battery box. The application relates to a battery box. 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