Battery system
By using a bidirectional explosion-proof valve and a capillary condensation structure in the battery system, gas condensation and separation are achieved, solving the problem of unstable gas pressure in the battery pack under different temperature environments and ensuring the safety and stability of the battery system.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-31
- Publication Date
- 2026-03-20
AI Technical Summary
The battery pack has difficulty maintaining internal pressure balance under different ambient temperatures, which leads to casing collapse and short circuit risks.
It adopts a two-way explosion-proof valve and capillary condensation structure, and realizes the condensation and separation of water vapor in the gas through capillary condensation technology, ensuring the balance of pressure difference between the inside and outside of the box and preventing the shell from sinking.
It effectively maintains the pressure balance of the battery system under different temperature environments, prevents casing collapse and short circuits, simplifies structural design, and saves space.
Smart Images
Figure CN224020977U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to battery technology field, concretely relates to battery system. BACKGROUND
[0002] At present, power battery pack and energy storage battery pack are applied extremely widely, and the rapid development of energy storage battery promotes the continuous research and development exploration of energy storage industry. However, for the battery pack, the seasonal temperature difference problem of each region leads to that the general battery pack is difficult to meet the demand of different environmental temperature.
[0003] When the battery pack is in a high-temperature environment, due to the gas expansion caused by the high-temperature environment, part of the gas in the battery box is discharged; when the battery pack is from a high-temperature environment to a low-temperature environment, due to the reduction of the gas amount and the influence of the low-temperature environment, the internal gas pressure of the battery pack will be reduced, which causes the shell to be inhaled and to be invaginated, the shell is made of metal material, and the invagination of the shell is easy to contact the positive and negative poles of the internal battery module and cause the short circuit of the battery pack. Therefore, there is an urgent need for a battery pack that can adapt to different environmental temperatures to meet the above demand. SUMMARY
[0004] Therefore, the utility model provides a kind of battery system to solve the problem that battery system is difficult to meet different environmental temperature demand.
[0005] The utility model provides a kind of battery system, comprising: box, two-way explosion valve and capillary condensation structure, the two-way explosion valve is set on the box, the two-way explosion valve has air inlet and exhaust port;The capillary condensation structure is at least with the air inlet can be communicated and is arranged;The battery system has air intake state and exhaust state, in the air intake state, the capillary condensation structure is communicated with the inside of the box by the air inlet, to send gas to the inside of the box;In the exhaust state, the inside of the box is exhausted by the exhaust port.
[0006] Beneficial effect: by setting capillary condensation structure, the water vapor condensation and separation of gas are realized by the capillary condensation technology of capillary condensation structure, then the gas is made to enter the box, and then the gas that enters the box by two-way explosion valve is dry gas, ensure that the pressure difference inside and outside the box is balanced, and the problem of shell invagination of the box is solved.
[0007] In an alternative embodiment, the capillary condensation structure includes a gas path pipe and a condensation valve, the gas path pipe has a first pipe opening and a second pipe opening, the first pipe opening is at least communicable with the air inlet, and the second pipe opening is adapted to input gas to the gas path pipe in the air intake state, at least part of the gas path pipe is a capillary tube, and the condensation valve is arranged on the gas path pipe.
[0008] Beneficial effects: the combination structure of the gas path pipe and the condensing valve is relatively simple and compact, facilitating installation and saving battery system space.
[0009] In an alternative embodiment, the inner diameter of the capillary pipe is d, satisfying 0.5mm≤d≤3mm.
[0010] Beneficial effects: by limiting the inner diameter of the capillary pipe, the steam pressure of the capillary pipe is reduced more obviously while the pressure resistance of the capillary pipe is ensured, ensuring the condensation effect of the capillary pipe.
[0011] In an alternative embodiment, in the gas inlet state, the pressure difference between the two ends of the capillary pipe is A, satisfying 0.3MPa≤A≤7MPa.
[0012] Beneficial effects: by limiting the pressure difference between the two ends of the capillary pipe, the water vapor separation effect of the capillary pipe is ensured.
[0013] In an alternative embodiment, in the gas inlet state, the temperature of the gas entering the capillary pipe from the second pipe opening is T, satisfying 5℃≤T≤40℃.
[0014] Beneficial effects: by limiting the temperature of the gas entering the capillary pipe from the second pipe opening, the water vapor separation effect of the capillary pipe is ensured.
[0015] In an alternative embodiment, the capillary condensing structure is arranged in communication with the gas outlet at the same time, and in the gas outlet state, the inside of the box is in communication with the capillary condensing structure through the gas outlet.
[0016] Beneficial effects: the capillary condensing structure simultaneously realizes the gas outlet and gas inlet in the box, and the structure is simple without the need for additional gas outlet structure.
[0017] In an alternative embodiment, the battery system further comprises an exhaust pipe, the exhaust pipe is arranged in communication with the gas outlet, and in the gas outlet state, the inside of the box is in communication with the exhaust pipe through the gas outlet.
[0018] In an alternative embodiment, the battery system further comprises a cooling plate, the cooling plate is arranged in the box, the cooling plate and the inner wall of one side of the box are arranged in a spaced manner to form a flow passage, and / or the cooling plate is formed with a flow passage, and the flow passage is in communication with the capillary condensing structure.
[0019] Beneficial effects: the flow passage is arranged close to the cooling plate, and the ambient gas entering the box is further cooled by the cooling plate, ensuring the rapid condensation and separation of the gas in the capillary pipe; the flow passage and the cooling plate are integrally arranged, without the need for a dedicated passage for gas flow in the box, the structure is compact and space-saving.
[0020] In an alternative embodiment, the battery system comprises a plurality of said boxes, each of which is provided with said bidirectional explosion-proof valve, and said bidirectional explosion-proof valve is correspondingly provided with said capillary condensation structure.
[0021] Beneficial effects: Each box is provided with a bidirectional explosion-proof valve to ensure the balance of air pressure in each box, thereby ensuring the balance of air pressure of the whole battery system.
[0022] In an alternative embodiment, the battery system comprises a plurality of said boxes, the plurality of said boxes are connected in communication, said bidirectional explosion-proof valve is arranged on at least one of said boxes, and said bidirectional explosion-proof valve is correspondingly provided with said capillary condensation structure.
[0023] Beneficial effects: The plurality of boxes are connected in communication, and the pressure balance in all the boxes can be maintained by fewer bidirectional explosion-proof valves, and the structure is simple. BRIEF DESCRIPTION OF DRAWINGS
[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the description of the embodiments or the prior art will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.
[0025] Figure 1 is a front view structural schematic diagram of the battery system of the embodiment of the present application;
[0026] Figure 2 is a side cross-sectional structural schematic diagram of the battery system of the embodiment of the present application;
[0027] Figure 3 is Figure 2 is a local enlarged schematic diagram of X;
[0028] Figure 4 is a three-dimensional structural schematic diagram of the battery system of the embodiment of the present application.
[0029] EXPLANATION OF REFERENCE NUMERALS:
[0030] 10, box; 20, bidirectional explosion-proof valve; 30, capillary condensation structure; 31, air path pipe; 311, first pipe opening; 312, second pipe opening; 32, condensation valve; 40, battery cell; 50, cooling plate; 60, flow-through channel; 70, connecting pipe. DETAILED DESCRIPTION
[0031] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described in combination with the drawings in the embodiments of the utility model below. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without creative labor belong to the protection scope of the utility model.
[0032] The embodiments of the utility model will be described below in combination with Figures 1 to 4
[0033] According to the embodiments of the utility model, a battery system is provided, comprising: a box body 10, a bidirectional explosion-proof valve 20 and a capillary condensation structure 30, the bidirectional explosion-proof valve 20 is arranged on the box body 10, the bidirectional explosion-proof valve 20 has an air inlet and an air outlet; the capillary condensation structure 30 is arranged in communication with at least the air inlet; the battery system has an air inlet state and an air outlet state, in the air inlet state, the capillary condensation structure 30 is in communication with the inside of the box body 10 through the air inlet to send air to the inside of the box body 10; in the air outlet state, the inside of the box body 10 is exhausted through the air outlet.
[0034] The battery system of the embodiment is applied, by arranging the capillary condensation structure 30, the water vapor condensation and separation of the gas are realized through the capillary condensation technology of the capillary condensation structure 30, then the gas enters the box body 10, and the gas entering the box body 10 through the bidirectional explosion-proof valve 20 is dry gas, so that the pressure difference between the inside and outside of the box body 10 is balanced, and the problem of the box body 10 shell sinking is solved.
[0035] It should be noted that when the battery system is in a high-temperature environment, the pressure inside the box body 10 increases, and part of the gas needs to be exhausted outside the box body 10; when the battery system is transferred from a high-temperature environment to a low-temperature environment, due to the influence of the low-temperature environment and the fact that part of the gas in the box body 10 has been exhausted, the pressure inside the box body 10 is less than the environmental pressure, the gas in the box body 10 is insufficient to maintain pressure balance, and the box body 10 will sink to cause the risk of short circuit.
[0036] It should be noted that in the related art, a one-way explosion-proof valve is arranged to realize one-way ventilation, that is, only the gas in the box body is released when the internal pressure is too large or the internal pressure increases suddenly due to thermal runaway, but this will cause the gas in the box body to leak; if a bidirectional explosion-proof valve is arranged, the air inlet will be actively opened when the pressure inside and outside the box body is equivalent or the external pressure is greater than the internal pressure, causing the environmental gas to enter the box body and causing the water vapor to enter, damaging the electrical elements and circuit contacts in the box body and causing the battery to be scrapped.
[0037] In the embodiment, when the battery system is in a high-temperature environment, the pressure inside the box 10 increases, and the exhaust port of the bidirectional explosion-proof valve 20 opens due to the pressure difference between the inside and outside of the box 10, so that part of the gas is discharged outside the box 10 through the exhaust port; when the pressure outside the box 10 is greater than the pressure inside the box 10, the gas inlet of the bidirectional explosion-proof valve 20 automatically opens, so that the ambient gas is supplied into the box 10. Moreover, the gas first passes through the capillary condensation structure 30, and the capillary condensation technology of the capillary condensation structure 30 is used to condense and recover the water vapor in the ambient gas, so that the separated dry gas enters the box 10, the gas amount in the box 10 is supplemented, and the pressure balance between the inside and outside of the box 10 is achieved, thereby solving the short circuit risk caused by the sinking of the box 10.
[0038] It should be noted that the capillary condensation technology mainly uses the micro channels in the capillary condensation structure 30 to condense the gas by reducing the temperature; when the gas passes through the micro channels, the interaction between the gas molecules is enhanced due to the size effect and surface tension of the channels, so that the gas is more prone to condensation.
[0039] In one embodiment, as shown in FIGS. 1 to 3, the capillary condensation structure 30 includes a gas path pipe 31 and a condensation valve 32. Figure 1 and Figure 2 The gas path pipe 31 has a first pipe opening 311 and a second pipe opening 312, the first pipe opening 311 is at least communicatively arranged with the gas inlet, and the second pipe opening 312 is adapted to input the gas into the gas path pipe 31 in the gas inlet state. At least part of the gas path pipe 31 is a capillary tube, and the condensation valve 32 is arranged on the gas path pipe 31. The combined structure of the gas path pipe 31 and the condensation valve 32 is relatively simple and compact, which is convenient for installation and saves the space occupied by the battery system.
[0040] Specifically, in the embodiment, the gas path pipe 31 is a capillary tube, and the capillary tube is a copper capillary tube.
[0041] It should be noted that in other alternative embodiments, only part of the gas path pipe 31 can be arranged as a capillary tube, so that the gas entering the box 10 through the first pipe opening 311 can pass through the capillary tube.
[0042] Specifically, in the gas inlet state, the external gas enters the capillary tube through the second pipe opening 312, and then enters the gas inlet of the bidirectional explosion-proof valve 20 through the first pipe opening 311 after condensation in the capillary tube, and then supplies the gas into the box 10.
[0043] In one embodiment, the inner diameter of the capillary tube is d, and satisfies 0.5mm≤d≤3mm. By limiting the inner diameter of the capillary tube, the steam pressure of the capillary tube is reduced more obviously while the pressure resistance of the capillary tube is ensured, so as to ensure the condensation effect of the capillary tube.
[0044] It should be noted that the smaller the inner diameter of the capillary tube, the more obvious the steam pressure reduction effect, and the better the condensation effect.
[0045] It should be further noted that when d < 0.5 mm, the pipe diameter is too small, which weakens the structural strength of the capillary tube and reduces the actual pressure resistance; when d > 3 mm, the flow rate in the capillary tube is reduced, which affects the heat exchange of the gas in the capillary tube and affects the condensation effect.
[0046] It should be noted that in other alternative embodiments, a plurality of capillary channels can be formed in the capillary tube, each capillary channel having a diameter d0, satisfying 0.5 mm ≤ d0 ≤ 3 mm.
[0047] In one embodiment, in the gas inlet state, the pressure difference between the two ends of the capillary tube is A, satisfying 0.3 MPa ≤ A ≤ 7 MPa. By limiting the pressure difference between the two ends of the capillary tube, the water vapor separation effect of the capillary tube is ensured.
[0048] It should be noted that the greater the pressure difference between the two ends of the capillary tube, the better the water vapor separation effect.
[0049] It should be further noted that when A < 0.3 MPa, the pressure difference between the first pipe port 311 and the second pipe port 312 is too small, the flow rate of the gas in the capillary tube is slow, which affects the water vapor separation effect of the capillary tube; when A > 7 MPa, the high pressure difference can cause the flow field in the capillary tube to be turbulent, and the turbulent flow field can increase the collision frequency between water vapor molecules and between water vapor and the inner wall of the capillary tube, which can interfere with the normal separation process of water vapor and reduce the separation effect.
[0050] In one embodiment, in the gas inlet state, the temperature of the gas entering the capillary tube from the second pipe port 312 is T, satisfying 5℃ ≤ T ≤ 40℃. By limiting the temperature of the gas entering the capillary tube from the second pipe port 312, the water vapor separation effect of the capillary tube is ensured.
[0051] It should be noted that the lower the temperature of the gas entering the capillary tube from the second pipe port 312, the better the water vapor separation effect.
[0052] It should be further noted that when T < 5℃, the temperature is too low, the water droplets condensed on the wall of the capillary tube can freeze, which can hinder the normal flow of the gas and affect the separation effect of the water vapor; when T > 40℃, the diffusion speed of the water vapor molecules in the capillary tube is accelerated, the diffusion of the water vapor molecules can hinder the condensation and separation of the water vapor on the wall of the capillary tube, the water vapor molecules are not easy to gather and reach the saturation state in the local area, which can affect the separation effect.
[0053] It should be noted that the specific separation efficiency of the capillary tube depends on the pipe diameter of the capillary channel, the pressure difference at both ends of the capillary tube, and the temperature of the gas entering the capillary tube through the second pipe opening 312, so that better separation efficiency can be achieved by different combinations of the pipe diameter of the capillary channel, the pressure difference at both ends of the capillary tube, and the temperature of the gas entering the capillary tube through the second pipe opening 312.
[0054] In one embodiment, the capillary condensation structure 30 is arranged in communication with the exhaust port at the same time, and in the exhaust state, the inside of the box 10 is communicated with the capillary condensation structure 30 through the exhaust port. The exhaust and intake of the box 10 are realized at the same time through the capillary condensation structure 30, which is simple in structure and does not need to additionally arrange an exhaust structure.
[0055] Specifically, the first pipe opening 311 of the gas path pipe 31 is in communication with the exhaust port and the intake port of the bidirectional explosion-proof valve 20 at the same time.
[0056] It should be noted that under normal circumstances, the exhaust port and the intake port of the bidirectional explosion-proof valve 20 are in a closed state, and the exhaust port and the intake port are not opened at the same time; in the exhaust state, the first pipe opening 311 of the gas path pipe 31 is communicated with the inside of the box 10 through the exhaust port to exhaust the gas in the box 10; in the intake state, the first pipe opening 311 of the gas path pipe 31 is communicated with the inside of the box 10 through the intake port to supply gas to the inside of the box 10.
[0057] In another embodiment, the battery system further comprises an exhaust pipe arranged in communication with the exhaust port, and in the exhaust state, the inside of the box 10 is communicated with the exhaust pipe through the exhaust port. That is, the first pipe opening 311 of the gas path pipe 31 is arranged in communication with the intake port only, and by arranging an additional exhaust pipe in communication with the exhaust port, the inside of the box is supplied with gas through the gas path pipe 31, and the gas in the box is exhausted through the exhaust pipe.
[0058] In one embodiment, the battery system further comprises a cooling plate 50 arranged in the box 10, the cooling plate 50 and the inner wall of one side of the box 10 are arranged in a spaced manner to form a flow channel 60, and / or the cooling plate 50 is formed with the flow channel 60, and the flow channel 60 is communicated with the capillary condensation structure 30. The flow channel 60 is arranged close to the cooling plate 50, and the ambient gas entering the box 10 is further cooled through the cooling plate 50, so as to ensure that the gas is quickly condensed and separated in the capillary tube.
[0059] Specifically, in the first embodiment, as shown in FIG. 1, Figure 2 and Figure 3As shown, the battery system further comprises the battery cell 40 and the cooling plate 50, both of which are arranged in the box 10, the cooling plate 50 is arranged in the box 10 in a spaced manner with the inner wall of one side of the box 10 to form the flow passage 60, the battery cell 40 is arranged on the side of the cooling plate 50 away from the flow passage 60, and the flow passage 60 is in communication with the capillary condensation structure 30. The flow passage 60 is arranged close to the cooling plate 50, and the ambient gas entering the box 10 is further cooled by the cooling plate 50, so as to ensure that the gas is quickly condensed and separated in the capillary tube.
[0060] In the second embodiment, the flow passage 60 is formed on the cooling plate 50, that is, the flow passage 60 is arranged in an integrated manner with the cooling plate 50. The flow passage 60 is arranged in an integrated manner with the cooling plate 50, and there is no need to arrange a special passage for gas flow in the box 10, so the structure is compact and space-saving.
[0061] It should be noted that the gas inlet pipeline can also be arranged separately, and the connecting pipeline is in communication with the second pipe opening 312 of the gas pipeline 31, so that the connecting pipeline is arranged close to the cooling plate 50.
[0062] In one embodiment, as shown in Figure 1 and Figure 4 , the box 10 is provided with a plurality of boxes 10, each of which is provided with the bidirectional explosion-proof valve 20, and the bidirectional explosion-proof valve 20 is provided with the capillary condensation structure 30. Each of the boxes 10 is provided with the bidirectional explosion-proof valve 20, so as to ensure the balance of the gas pressure in each of the boxes 10, and further ensure the balance of the gas pressure of the whole battery system.
[0063] Specifically, as shown in Figure 1 , the box 10, the capillary condensation structure 30 and the bidirectional explosion-proof valve 20 are all provided with five, and each of the boxes 10 is provided with one bidirectional explosion-proof valve 20 and one capillary condensation structure 30.
[0064] It should be noted that, as shown in Figure 1 , the battery system can also be provided with the connecting pipe 70, and the two ends of the connecting pipe 70 are in communication with the flow passage 60 and the second pipe opening 312 of the gas pipeline 31, respectively.
[0065] Further, as shown in Figure 1 , the gas pipelines 31 corresponding to the plurality of boxes 10 are arranged in a communication manner, and therefore, all the gas pipelines 31 share the same condensation valve 32, so as to optimize the structure composition.
[0066] In other alternative embodiments, the number of the box 10, the capillary condensation structure 30 and the bidirectional explosion-proof valve 20 can be selected according to actual conditions.
[0067] In another embodiment, the box 10 is provided with several, the several boxes 10 are communicated, the bidirectional explosion-proof valve 20 is arranged on at least one box 10, and the bidirectional explosion-proof valve 20 is correspondingly provided with the capillary condensation structure 30. The several boxes 10 are communicated, and the pressure balance in all the boxes 10 can be maintained through fewer bidirectional explosion-proof valves 20, and the structure is simple. Exemplarily, the several boxes 10 are communicated, the bidirectional explosion-proof valve 20 is arranged on only one of the boxes 10, and the capillary condensation structure 30 is arranged correspondingly to the bidirectional explosion-proof valve 20.
[0068] Although the embodiments of the present application are described in conjunction with the drawings, various modifications and changes can be made by those skilled in the art without departing from the spirit and scope of the present application, and such modifications and changes fall within the scope defined by the present application.
Claims
1. A battery system, characterized in that, include: Box (10), A two-way explosion-proof valve (20) is provided on the housing (10) and has an air inlet and an exhaust outlet. A capillary condensation structure (30) is provided, which is at least communicatively connected to the air inlet; The battery system has an intake state and an exhaust state. In the intake state, the capillary condensation structure (30) communicates with the interior of the housing (10) through the intake port to supply air into the housing (10). In the exhaust state, the interior of the housing (10) exhausts air through the exhaust port.
2. The battery system according to claim 1, characterized in that, The capillary condenser structure (30) includes a gas pipe (31) and a condenser valve (32). The gas pipe (31) has a first port (311) and a second port (312). The first port (311) is at least connected to the air inlet. The second port (312) is adapted to input gas into the gas pipe (31) in the air inlet state. At least part of the gas pipe (31) is a capillary tube. The condenser valve (32) is disposed on the gas pipe (31).
3. The battery system according to claim 2, characterized in that, The inner diameter of the capillary is d, which satisfies 0.5mm≤d≤3mm.
4. The battery system according to claim 2, characterized in that, In the air intake state, the pressure difference across the capillary is A, which satisfies 0.3MPa≤A≤7MPa.
5. The battery system according to claim 2, characterized in that, In the air intake state, the temperature of the gas entering the capillary from the second port (312) is T, which satisfies 5℃≤T≤40℃.
6. The battery system according to any one of claims 1-5, characterized in that, The capillary condensation structure (30) is also connected to the exhaust port. In the exhaust state, the interior of the housing (10) is connected to the capillary condensation structure (30) through the exhaust port.
7. The battery system according to any one of claims 1-5, characterized in that, The battery system also includes an exhaust pipe, which is connected to the exhaust port. In the exhaust state, the interior of the housing (10) is connected to the exhaust pipe through the exhaust port.
8. The battery system according to any one of claims 1-5, characterized in that, The battery system further includes a cooling plate (50) disposed inside the housing (10). The cooling plate (50) and one side inner wall of the housing (10) are spaced apart to form a flow channel (60), and / or, a flow channel (60) is formed on the cooling plate (50), and the flow channel (60) is connected to the capillary condensation structure (30).
9. The battery system according to any one of claims 1-5, characterized in that, The enclosure (10) is provided in several parts, and each enclosure (10) is provided with the bidirectional explosion-proof valve (20), and the bidirectional explosion-proof valve (20) is provided with the capillary condensation structure (30).
10. The battery system according to any one of claims 1-5, characterized in that, The enclosure (10) is provided in a plurality of ways, and the plurality of enclosures (10) are connected in a manner. The bidirectional explosion-proof valve (20) is provided on at least one of the enclosures (10), and the bidirectional explosion-proof valve (20) is provided with the capillary condensation structure (30) corresponding to it.