A battery pack

Abstract

This utility model discloses a battery pack, belonging to the field of battery technology. The battery pack includes a battery housing, an explosion-proof valve, and a first collecting device. The battery housing forms a receiving cavity, and the side wall of the battery housing is provided with a receiving groove communicating with the receiving cavity. The explosion-proof valve is located in the receiving groove, and the first collecting device is located at the bottom of the receiving cavity and covers at least part of the receiving groove. The first collecting device has a first collecting chamber with an upward opening. The side wall of the first collecting chamber near the receiving groove is provided with multiple filter holes, which communicate with the receiving groove. During thermal runaway, the high-temperature gas flow flows from the location of the runaway battery cell to the explosion-proof valve and is discharged from the battery housing. The high-temperature gas flow passes through the first collecting device before flowing through the explosion-proof valve. Solid particles carried in the high-temperature gas flow are retained in the first collecting chamber due to the blocking effect of the filter holes. The first collecting chamber can also contain high-temperature liquid to prevent the explosion-proof valve from being blocked and to ensure smooth exhaust.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a battery pack. Background Technology

[0002] When a power battery pack experiences thermal runaway, it generates a large amount of heat. When this heat accumulates to a certain critical value, it can trigger the explosion-proof valve to open, simultaneously ejecting a series of high-temperature explosive materials. These include high-temperature liquids such as electrolytes, high-temperature gases such as lithium battery chemical reactants, high-temperature solids such as separators, copper foil, and aluminum foil, as well as smoke from burning particles. Among these, the high-temperature solids can easily clog the explosion-proof valve when passing through it, leading to pressure buildup inside the battery pack and potentially causing an explosion, posing a significant safety hazard. Utility Model Content

[0003] This invention provides a battery pack to solve the technical problem in the prior art where high-temperature substances generated during thermal runaway can easily cause blockage of the explosion-proof valve.

[0004] Based on the above concept, the technical solution adopted by this utility model is as follows:

[0005] A battery pack, comprising:

[0006] A battery housing is provided to form a receiving cavity, and the side wall of the battery housing is provided with a receiving groove that communicates with the receiving cavity;

[0007] An explosion-proof valve is disposed in the receiving groove;

[0008] A first collecting device is disposed at the bottom of the receiving cavity and covers at least part of the receiving groove. The first collecting device has a first collecting cavity with an upward opening. A plurality of filter holes are provided on the side wall of the first collecting cavity near the receiving groove, and the filter holes are in communication with the receiving groove.

[0009] Preferably, the explosion-proof valve has an exhaust chamber communicating with the receiving groove, the diameter of a single filter hole is smaller than the maximum inner diameter of the exhaust chamber, and the total flow area of ​​all the filter holes is larger than the maximum cross-sectional area of ​​the exhaust chamber.

[0010] Preferably, the first collecting device includes a first side plate, and the filter hole is disposed on the first side plate. Along the height direction of the first side plate, the first side plate blocks the exhaust chamber of the explosion-proof valve.

[0011] Preferably, along the height direction of the first side plate, the first side plate covers 1 / 2 to 3 / 4 of the receiving groove area.

[0012] Preferably, the first collecting device further includes a second side plate, which is connected to the first side plate and is disposed on the side away from the battery box, and the second side plate is higher than the first side plate.

[0013] Preferably, a first liquid-absorbing structure is provided on the bottom wall of the first collection chamber, and the first liquid-absorbing structure extends along the length direction of the first collection chamber.

[0014] Preferably, the battery pack further includes a second collecting device, which is disposed at the bottom of the receiving cavity and has a second collecting cavity with an upward opening;

[0015] The first collecting device and the second collecting device are spaced apart along the width direction of the battery box, and the electrical components are disposed between the first collecting device and the second collecting device.

[0016] Preferably, the battery pack further includes a liquid cooling assembly, which includes a plurality of side cold plates, a first pipe connector, a second pipe connector, and a first connecting pipe connecting the plurality of side cold plates. The first pipe connector is disposed above the first collection chamber, the second pipe connector is disposed above the second collection chamber, and the first connecting pipe extends along the width direction of the battery housing.

[0017] Preferably, the liquid cooling assembly further includes a bottom cold plate and a second connecting pipe communicating with the bottom cold plate. The second collecting device includes a second base plate with a clearance hole for the second connecting pipe to pass through. The second base plate also has a second liquid suction structure that extends along the length of the second collecting cavity.

[0018] Preferably, the second collecting device includes a second base plate and a surrounding plate, the surrounding plate extending circumferentially around the second base plate and forming a second collecting cavity with the second base plate, wherein the surrounding plate on the side of the second collecting cavity closer to the electrical component is higher than the rest of the surrounding plate.

[0019] The beneficial effects of this utility model are:

[0020] The battery pack proposed in this utility model has a battery box forming a receiving cavity, and the side wall of the battery box is provided with a receiving groove communicating with the receiving cavity. An explosion-proof valve is provided in the receiving groove. In the event of thermal runaway, the high-temperature gas flow flows from the location of the runaway cell to the explosion-proof valve and is discharged from the battery box. Since the first collecting device is provided at the bottom of the receiving cavity and blocks at least part of the receiving groove, the high-temperature gas flow passes through the first collecting device before flowing through the explosion-proof valve. The solid particles carried in the high-temperature gas flow are blocked by the filter holes and remain in the first collecting cavity. The first collecting cavity can also contain high-temperature liquid to prevent the explosion-proof valve from being blocked and ensure smooth exhaust. Attached Figure Description

[0021] Figure 1 This is a first schematic diagram of a portion of the structure of the battery pack provided in this embodiment of the present utility model;

[0022] Figure 2 yes Figure 1 Partial structural diagram;

[0023] Figure 3 yes Figure 1 Enlarged view of point A;

[0024] Figure 4 This is a second schematic diagram showing a partial structure of the battery pack provided in this embodiment of the present invention;

[0025] Figure 5 yes Figure 4 Partial structural diagram;

[0026] Figure 6 This is a third schematic diagram showing a partial structure of the battery pack provided in this embodiment of the present invention;

[0027] Figure 7 This is a schematic diagram of the first collection device and the first liquid absorption structure provided in an embodiment of the present invention;

[0028] Figure 8 This is a schematic diagram of the second collection device and the second liquid absorption structure provided in the embodiment of this utility model.

[0029] In the picture:

[0030] 10. Battery housing; 11. Receiving cavity; 12. Receiving slot;

[0031] 20. Explosion-proof valve; 21. Exhaust chamber;

[0032] 30. First collecting device; 31. First collecting chamber; 32. Filter hole; 33. First side plate; 34. Second side plate; 35. Third side plate; 36. Fourth side plate; 37. First bottom plate;

[0033] 41. First liquid absorption structure; 42. Second liquid absorption structure;

[0034] 50. Second collecting device; 51. Second collecting chamber; 52. Second bottom plate; 521. Clearance hole; 53. Enclosure plate; 54. Protective plate;

[0035] 60. Liquid cooling assembly; 61. Side cold plate; 62. First pipe joint; 63. Second pipe joint; 64. First connecting pipe; 65. Bottom cold plate; 66. Second connecting pipe;

[0036] 70. Battery module; 71. Cell assembly. Detailed Implementation

[0037] The embodiments of this utility model are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0038] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0039] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0040] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0041] See Figures 1 to 8 This embodiment provides a battery pack, including a battery housing 10, an explosion-proof valve 20, and a first collection device 30. The battery housing 10 forms a receiving cavity 11, and the side wall of the battery housing 10 is provided with a receiving groove 12 communicating with the receiving cavity 11. The explosion-proof valve 20 is disposed in the receiving groove 12. The first collection device 30 is disposed at the bottom of the receiving cavity 11 and covers at least part of the receiving groove 12. The first collection device 30 has a first collection cavity 31 with an upward opening. The side wall of the first collection cavity 31 near the receiving groove 12 is provided with a plurality of filter holes 32, and the filter holes 32 are communicating with the receiving groove 12.

[0042] During thermal runaway, the high-temperature gas flow flows from the location of the runaway cell to the explosion-proof valve 20 and is discharged from the battery box 10. Since the first collecting device 30 is located at the bottom of the receiving cavity 11 and blocks at least part of the receiving groove 12, the high-temperature gas flow passes through the first collecting device 30 before flowing through the explosion-proof valve 20. The solid particles carried in the high-temperature gas flow are blocked by the filter hole 32 and remain in the first collecting cavity 31. The first collecting cavity 31 can also contain high-temperature liquid to prevent the explosion-proof valve 20 from being blocked and to ensure smooth exhaust.

[0043] Each explosion-proof valve 20 is provided with a receiving slot 12. When multiple explosion-proof valves 20 are provided, multiple receiving slots 12 are provided at intervals on the battery box 10. The first collecting device 30 can collect high-temperature solids, semi-solids, and liquids, and can be made of existing high-temperature resistant materials, such as aluminum. The first collecting device 30 can be formed by injection molding or metal stamping. The number of first collecting devices 30 can be set according to actual needs. When multiple explosion-proof valves 20 are provided, one first collecting device 30 can be set for each explosion-proof valve 20, or the first collecting device 30 can be set for some of the explosion-proof valves 20. This can buffer the high-speed ejection of solids, semi-solids, and liquids during thermal runaway, avoiding direct spraying into the external environment of the battery box 10 and causing pollution and potential damage, thereby improving the safety and reliability of the battery pack.

[0044] The explosion-proof valve 20 has an exhaust chamber 21 communicating with the receiving groove 12. The diameter of each filter hole 32 is smaller than the maximum inner diameter of the exhaust chamber 21 to ensure that ejected materials (such as high-temperature gas, high-temperature molten electrolyte, broken diaphragm material, electrode fragments, and other solid or viscous semi-solid substances) can be smoothly discharged through the exhaust chamber 21 of the explosion-proof valve 20 after filtration, thus better preventing blockage of the explosion-proof valve 20 in the event of thermal runaway. The total flow area of ​​the filter holes 32 is larger than the maximum cross-sectional area of ​​the exhaust chamber 21 to ensure exhaust efficiency and prevent high-temperature airflow from accumulating in the receiving cavity 11.

[0045] The first collecting device 30 shields at least a portion of the receiving groove 12 to prevent larger solid materials from entering the explosion-proof valve 20. The filter hole 32 is located in the area of ​​the receiving groove 12 shielded by the first collecting device 30, allowing the high-temperature airflow to enter the explosion-proof valve 20 after filtration. In this embodiment, the first collecting device 30 shields a portion of the receiving groove 12, specifically 1 / 2 to 3 / 4 of the receiving groove 12, leaving a certain exhaust space at the top of the receiving groove 12 to reduce exhaust resistance. Since the density of the metallic solid material in the thermal runaway high-temperature airflow is greater than that of air, it mainly concentrates in the lower part or bottom of the high-temperature airflow. Therefore, when the thermal runaway high-temperature airflow passes through the filter hole 32, the accompanying metallic solid material is blocked in front of the filter hole 32 and scattered at the bottom of the first collecting chamber 31. When the shielding portion is less than 1 / 2, the collection efficiency of solid ejected materials is relatively low, and the guiding and separating effect on the airflow is weak; when the shielding portion is greater than 3 / 4, the redundant exhaust area is small, and the gas emission may generate a slightly higher back pressure. Therefore, setting the ratio of the shielded portion of the first collecting device 30 to the receiving groove 12 to 1 / 2 to 3 / 4 can take into account both the collection of high-temperature solid ejected material and redundant exhaust.

[0046] It should be noted that in other embodiments, the first collecting device 30 covers the entire receiving slot 12, and the exhaust resistance can be reduced by increasing the exhaust area of ​​the explosion-proof valve 20.

[0047] For example, the first collecting device 30 includes a first side plate 33, and a filter hole 32 is disposed on the first side plate 33. Along the height direction of the first side plate 33, the first side plate 33 blocks the exhaust chamber 21. By blocking the exhaust chamber 21, larger solid materials are prevented from directly entering the exhaust chamber 21, so as to prevent clogging of the explosion-proof valve 20.

[0048] Along the height direction of the first side plate 33, the first side plate 33 covers 1 / 2 to 3 / 4 of the receiving groove 12. This leaves a certain amount of exhaust space in the upper part of the receiving groove 12, reducing exhaust resistance. While covering the receiving groove 12, the first side plate 33 communicates with the receiving groove 12 through a filter hole 32 provided on the first side plate 33. The filter hole 32 allows high-temperature airflow and small solid substances carried in the high-temperature airflow to pass through, without causing blockage of the explosion-proof valve 20.

[0049] The diameter, number, spacing, and other parameters of the filter holes 32 can be set according to actual needs. The multiple filter holes 32 can be evenly or non-uniformly distributed on the first side plate 33. For example, the multiple filter holes 32 are arranged in a matrix on the first side plate 33.

[0050] For example, the diameter of the filter orifice 32 can be set according to the following relationship: L > D > d; D is the diameter of the filter orifice 32, L is the average size of the unmelted solid material ejected during thermal runaway of the battery cell, and d is the maximum inner diameter of the exhaust chamber 21 of the explosion-proof valve 20. This relationship ensures that most solid materials, such as copper foil, are blocked in front of the filter orifice 32 without clogging the explosion-proof valve 20. For example, n × π × r 2 ≥S; n is the number of filter holes 32, r is the radius of the filter holes 32, and S is the cross-sectional area of ​​the exhaust chamber 21 of the explosion-proof valve 20; this condition satisfies that the total flow area of ​​the filter holes 32 is not less than the cross-sectional area of ​​the exhaust chamber 21 of the explosion-proof valve 20, ensuring smooth and unobstructed exhaust. The spacing of the filter holes 32 can be calculated based on the number of filter holes 32, the diameter of the filter holes 32, and the length of the first side plate 33 where the filter holes 32 are set. △L=[L1-D×n1] / (n1+1); △L is the spacing of the filter holes 32, L1 is the length of the first side plate 33, and n1 is the number of filter holes 32 set in each row along the length direction of the first side plate 33.

[0051] The battery pack also includes a liquid cooling assembly 60, which includes multiple side cooling plates 61, a first pipe connector 62 connecting the multiple side cooling plates 61, a second pipe connector 63, and a first connecting pipe 64. The first pipe connector 62 is disposed above the first collection chamber 31. Due to the flexibility of the pipes, residual or leaked coolant can flow into the first collection chamber 31 in the event of disassembly or pipe leakage. The liquid cooling assembly 60 also includes a bottom cooling plate 65, which is disposed at the bottom of the frame and forms the bottom wall of the receiving cavity 11. A first collection device 30 is disposed within the receiving cavity 11, and exemplaryly, the first collection device 30 is connected to the bottom cooling plate 65, for example, by welding.

[0052] It should be noted that the distance H1 between the bottommost filter hole 32 and the bottom wall of the first collection chamber 31 must satisfy the requirement that the effective liquid collection volume of the first collection device 30 must be greater than the volume of coolant contained in the pipeline, in order to prevent residual coolant from overflowing through the filter hole 32 when the pipeline is disassembled. For example, V 有效 ≥Vcube, where V 有效 The effective volume of the first collecting device 30 is the product of the bottom area and the effective height of the first collecting chamber 31 of the first collecting device 30. The effective height is H1, which is to prevent the collected liquid in the first collecting chamber 31 from overflowing from the filter hole 32. The bottom area of ​​the first collecting chamber 31 is equal to the product of the length and width of the bottom wall of the first collecting chamber 31. Vcube is the effective volume inside the pipe, that is, the volume of coolant that the pipe can hold.

[0053] The first collection device 30 further includes a second side plate 34. The second side plate 34 is connected to the first side plate 33 and is disposed on the side背离 the battery box body 10, and the second side plate 34 is higher than the first side plate 33. Electrical components, such as high-voltage electrical components, are usually disposed on the side of the first collection device 30背离 the battery box body 10. By setting the second side plate 34 higher than the first side plate 33, the electrical components can be protected to prevent the liquid in the first collection chamber 31 from splashing into the area where the electrical components are located and damaging the electrical components.

[0054] The first collection device 30 further includes a third side plate 35 and a fourth side plate 36. The third side plate 35 is connected to the first side plate 33, and the fourth side plate 36 is disposed opposite to the first side plate 33 and is connected to the second side plate 34. The third side plate 35 and the fourth side plate 36 can be at the same height as the first side plate 33, which is convenient for processing and production.

[0055] A liquid cooling pipeline is disposed above the second side plate 34, and the distance between the upper end of the second side plate 34 and the pipeline is greater than 5 mm to ensure that there is no contact between the pipeline and the second side plate 34 during vibration. The height h of the second side plate 34 should satisfy: h1 + d × m ≤ h < h2, where h1 is the maximum height of the other three side plates, d is the outer diameter of the pipeline, and m is the design margin coefficient taken as 1 to 1.5; h2 is the lowest height of the pipeline above the first collection device 30; it can ensure that the residual liquid in the pipeline will not splash into the electrical component area during disassembly, playing a safety protection role.

[0056] A first liquid absorption structure 41 is disposed on the bottom wall of the first collection chamber 31, and the first liquid absorption structure 41 extends along the length direction of the first collection chamber 31. By setting the first liquid absorption structure 41, the liquid in the first collection chamber 31 can be absorbed to prevent the liquid from overflowing during use. In other embodiments, the first liquid absorption structure 41 can be set to cover the bottom wall of the first collection chamber 31. Since covering the bottom wall has a higher cost, in this application, the first liquid absorption structure 41 is set to extend along the length direction of the first collection chamber 31. Since the surface tension of the first collection chamber 31 is small, during the use of the battery pack, due to shaking, the liquid droplets scattered in the first collection chamber 31 roll freely in the first collection chamber 31 under the action of inertia. The first liquid absorption structure 41 extends along the length direction of the first collection chamber 31, and can absorb the freely moving liquid to the greatest extent, achieving the maximum adsorption effect.

[0057] Exemplarily, the first liquid absorption structure 41 is located in the central area of the first collection chamber 31 and can be in an S shape or a long strip shape, extending from one end to the other end along the length direction of the first collection chamber 31, taking into account both cost and the effect of adsorbing residual liquid.

[0058] In some embodiments, the first collecting device 30 further includes a first base plate 37. The first base plate 37, the first side plate 33, the second side plate 34, the third side plate 35, and the fourth side plate 36 together form a first collecting cavity 31. The first base plate 37 is connected to the bottom cold plate 65. The first side plate 33 covers the receiving groove 12 and is provided with filter holes 32. The second side plate 34 is higher than the first side plate 33. By setting the first collecting device 30 on the bottom cold plate 65, the surface of the bottom cold plate 65 is prevented from being directly exposed to the air area, reducing the risk of condensation on the surface of the bottom cold plate 65 during the cooling process.

[0059] In some embodiments, the first side plate 33, the second side plate 34, the third side plate 35, and the fourth side plate 36 are all disposed on the bottom cold plate 65 and together with the bottom cold plate 65 form the first collection cavity 31. The first side plate 33 covers the receiving groove 12 and is provided with filter holes 32, and the second side plate 34 is higher than the first side plate 33. By providing a first liquid absorption structure 41 on the bottom cold plate 65, the first liquid absorption structure 41 covers part of the bottom cold plate 65, avoiding direct exposure of the surface of the bottom cold plate 65 to the air area, and reducing the risk of condensation on the surface of the bottom cold plate 65 during the cooling process.

[0060] The battery pack also includes a second collecting device 50, which is disposed at the bottom of the receiving cavity 11 and has an upward-facing second collecting chamber 51. The first collecting device 30 and the second collecting device 50 are spaced apart along the width direction of the battery housing 10, and electrical components are disposed between the first collecting device 30 and the second collecting device 50. The first collecting device 30 and the second collecting device 50 cooperate to protect the electrical components. By collecting the solids and liquids generated during thermal runaway, liquid damage to the electrical components can be prevented.

[0061] In this embodiment, as Figure 4 As shown, X represents the width direction of the battery box 10, Y represents the length direction of the battery box 10, and Z represents the height direction of the battery box 10.

[0062] The battery pack includes a liquid cooling assembly 60, which includes multiple side cooling plates 61, a first pipe connector 62, a second pipe connector 63, and a first connecting pipe 64 connecting the multiple side cooling plates 61. The first pipe connector 62 is located above the first collection chamber 31, the second pipe connector 63 is located above the second collection chamber 51, and the first connecting pipe 64 extends along the width direction of the battery box 10. This facilitates the distribution of pipes in the accommodating cavity 11, making the space more compact and improving space utilization. Because of the flexibility of the pipeline, when the pipeline is disassembled, the coolant remaining in the first connecting pipeline 64 can be discharged to the first collection chamber 31 and the second collection chamber 51 through the first pipeline joint 62 and the second pipeline joint 63; when the first pipeline joint 62 or the second pipeline joint 63 leaks, the leaked coolant can be collected by the first collection chamber 31 and the second collection chamber 51 to prevent high-voltage short circuits and arcing, which could endanger the safety of operators; in the event of thermal runaway, even if the first pipeline joint 62 and the second pipeline joint 63 burn out, the coolant can be collected by the first collection chamber 31 and the second collection chamber 51, which will not lead to a large amount of coolant leakage and avoid short circuits.

[0063] The battery pack also includes a battery module 70, which is disposed within the accommodating cavity 11. Side cooling plates 61 are disposed on both sides of the battery module 70 in the width direction. When the battery module 70 includes multiple sets of battery cells 71, the multiple sets of battery cells 71 are arranged along the X direction, and a side cooling plate 61 is disposed between two adjacent sets of battery cells 71.

[0064] The liquid cooling assembly 60 includes a bottom cooling plate 65 and a second connecting pipe 66 communicating with the bottom cooling plate 65. The second collecting device 50 includes a second base plate 52 with a clearance hole 521 for the second connecting pipe 66 to pass through. A second liquid-absorbing structure 42 is also provided on the second base plate 52, extending along the length of the second collecting chamber 51. The clearance hole 521 allows the second connecting pipe 66 to pass through, facilitating its connection with the bottom cooling plate 65. The second liquid-absorbing structure 42 absorbs liquid from the second collecting chamber 51, preventing liquid overflow during use.

[0065] In other embodiments, a second liquid-absorbing structure 42 may be provided to cover the bottom wall of the second collection cavity 51. Since covering the bottom wall is costly, this application provides that the second liquid-absorbing structure 42 extends along the length of the second collection cavity 51. Since the surface tension of the second collection cavity 51 is small, during the use of the battery pack, the droplets scattered in the second collection cavity 51 due to shaking will roll freely in the second collection cavity 51 under the action of inertia. The second liquid-absorbing structure 42 extends along the length of the second collection cavity 51, which can absorb the freely moving liquid to the maximum extent and achieve the maximum adsorption effect.

[0066] For example, the second liquid absorption structure 42 is located in the central region of the second collection cavity 51, and can be S-shaped or elongated, extending from one end to the other along the length of the second collection cavity 51.

[0067] The second collection device 50 also includes a protective plate 54, which is disposed in the second collection chamber 51 and extends circumferentially around the relief hole 521 to prevent liquid in the second collection chamber 51 from leaking from the relief hole 521.

[0068] The second collecting device 50 includes a second base plate 52 and a surrounding plate 53. The surrounding plate 53 extends circumferentially around the second base plate 52 and together with the second base plate 52 forms a second collecting cavity 51. The side of the surrounding plate 53 near the electrical component in the second collecting cavity 51 is higher than the other surrounding plates 53 to protect the electrical component from liquid splashing into the area where the electrical component is located and damaging it. A liquid cooling pipeline is provided above the surrounding plate 53, and the distance between the upper end of the surrounding plate 53 and the pipeline is greater than 5 mm to ensure that the pipeline does not come into contact with the surrounding plate 53 during vibration.

[0069] Protective sleeves are fitted onto the first connecting pipe 64 and / or the second connecting pipe 66. In the event of thermal runaway, high-temperature gas flows from the location of the runaway cell to the explosion-proof valve 20 for discharge to the outside. Therefore, the temperature in the flow path area reaches hundreds of degrees Celsius, especially in the area in front of the explosion-proof valve 20. If the pipes in this area are not protected, they will melt and break under high temperature, causing a large amount of coolant to flow into the battery box 10, creating a safety hazard. Protective sleeves are installed to protect the pipes and prevent them from breaking.

[0070] Yes, all pipelines can be fitted with protective sleeves. To save costs, the pipelines at the top and near the explosion-proof valve 20 are mainly affected by the high-temperature airflow, so only a portion of the pipelines can be fitted with protective sleeves.

[0071] The thickness of the pipe protective sleeve ranges from 0.35mm to 1.5mm, and the design length can be calculated using the following formula: Lt = λ × Lcube; Lt is the length of the pipe protective sleeve; λ is the design coefficient, which is taken as 0.85 to 0.95, mainly to ensure installation margin; Lcube is the pipe length.

[0072] The above embodiments merely illustrate the basic principles and characteristics of this utility model. This utility model is not limited to the above embodiments. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A battery pack, characterized by, include: A battery box (10) is provided to form a receiving cavity (11), and the side wall of the battery box (10) is provided with a receiving groove (12) that communicates with the receiving cavity (11); An explosion-proof valve (20) is disposed in the receiving groove (12); A first collecting device (30) is disposed at the bottom of the receiving cavity (11) and covers at least part of the receiving groove (12). The first collecting device (30) has a first collecting cavity (31) with its opening facing upward. A plurality of filter holes (32) are provided on the side wall of the first collecting cavity (31) near the receiving groove (12). The filter holes (32) are connected to the receiving groove (12).

2. The battery pack of claim 1, wherein, The explosion-proof valve (20) has an exhaust chamber (21) communicating with the receiving groove (12), the diameter of a single filter hole (32) is smaller than the maximum inner diameter of the exhaust chamber (21), and the total flow area of ​​all the filter holes (32) is greater than the maximum cross-sectional area of ​​the exhaust chamber (21).

3. The battery pack of claim 1, wherein, The first collecting device (30) includes a first side plate (33), and the filter hole (32) is disposed on the first side plate (33). Along the height direction of the first side plate (33), the first side plate (33) blocks the exhaust chamber (21) of the explosion-proof valve (20).

4. The battery pack of claim 3, wherein, Along the height direction of the first side plate (33), the first side plate (33) covers 1 / 2 to 3 / 4 of the receiving groove (12).

5. The battery pack of claim 3, wherein, The first collecting device (30) further includes a second side plate (34), which is connected to the first side plate (33) and is disposed on the side away from the battery box (10). The second side plate (34) is higher than the first side plate (33).

6. The battery pack of claim 1, wherein, A first liquid absorption structure (41) is provided on the bottom wall of the first collection chamber (31), and the first liquid absorption structure (41) extends along the length direction of the first collection chamber (31).

7. The battery pack of any one of claims 1-6, wherein, The battery pack also includes a second collection device (50), which is disposed at the bottom of the receiving cavity (11) and has an upward-facing second collection cavity (51). The first collecting device (30) and the second collecting device (50) are spaced apart along the width direction of the battery box (10), and electrical components are disposed between the first collecting device (30) and the second collecting device (50).

8. The battery pack of claim 7, wherein, The battery pack also includes a liquid cooling assembly (60), which includes a plurality of side cooling plates (61), a first pipe connector (62) connecting the plurality of side cooling plates (61), a second pipe connector (63) and a first connecting pipe (64). The first pipe connector (62) is disposed above the first collection chamber (31), the second pipe connector (63) is disposed above the second collection chamber (51), and the first connecting pipe (64) extends along the width direction of the battery housing (10).

9. The battery pack of claim 8, wherein, The liquid cooling assembly (60) further includes a bottom cold plate (65) and a second connecting pipe (66) connecting the bottom cold plate (65). The second collecting device (50) includes a second base plate (52), on which a clearance hole (521) is provided. The clearance hole (521) is used to pass through the second connecting pipe (66). A second liquid suction structure (42) is provided on the second base plate (52), and the second liquid suction structure (42) extends along the length direction of the second collecting cavity (51).

10. The battery pack of claim 7, wherein, The second collecting device (50) includes a second base plate (52) and a surrounding plate (53), the surrounding plate (53) extending circumferentially around the second base plate (52) and forming a second collecting cavity (51) with the second base plate (52), the surrounding plate (53) on the side of the second collecting cavity (51) closer to the electrical component is higher than the other surrounding plates (53).

Images