Explosion-proof structure for battery pack and battery pack

Abstract

The utility model provides an explosion-proof structure for a battery pack and the battery pack. The explosion-proof structure for the battery pack comprises a shell, a pressure release valve, a fire filtering component and a fan component, the shell is provided with an installation space in a surrounding mode, and the pressure release valve, the fire filtering component and the fan component are sequentially arranged in the installation space at intervals in the first direction. The fan component is provided with a driving part, a rotating part and a fan blade part connected to the rotating part; the rotating part is fixed to the fire filtering component through a bearing, the driving part is connected with the rotating part and can drive the rotating part to rotate, and the rotating part rotates to drive the fan blade part to rotate, so that the fan blade part can discharge water vapor and / or smoke in the battery pack out of the battery pack. When thermal runaway of the battery pack is caused by overcharging, overdischarging, short circuit and the like, the pressure release valve, the fire filtering component and the fan component are started at the same time, the pressure release valve is used for releasing pressure of the battery pack, the fire filtering component has a fire filtering function, and the fan component can blow away water vapor and smoke to the outer side of the battery pack in time, so that the current requirement for the battery pack is better met.

Description

Technical Field

[0001] The present application relates to the technical field of battery packs, and in particular to an explosion-proof structure for a battery pack and a battery pack. Background Art

[0002] During use, the battery pack may generate a large amount of heat instantly due to overcharging, over-discharging, short circuit, etc., causing the battery pack to experience thermal runaway. Thermal runaway of the battery pack may produce flames or even cause serious accidents such as explosions.

[0003] In order to ensure the safety of the battery pack when it goes into thermal runaway, a pressure relief valve is generally installed on the battery pack shell. The pressure relief valve has the functions of waterproofing and ventilation, as well as exhausting in case of thermal runaway. However, the existing pressure relief valve has the following defects: (1) The waterproofing ability of the pressure relief valve is limited. When a large amount of water vapor accumulates in the battery pack, condensation is likely to occur, which poses a risk of insulation failure; (2) When the battery cell goes into thermal runaway, the pressure relief valve exhausts air. When the pressure in the battery pack decreases, the exhaust rate also decreases, and the high-temperature smoke of the battery pack cannot be quickly discharged from the outside of the battery pack.

[0004] Therefore, there is an urgent need for an explosion-proof structure for a battery pack and a battery pack to solve the technical problems existing in the prior art to a certain extent. Utility Model Content

[0005] The purpose of the present application is to provide an explosion-proof structure for a battery pack and a battery pack, which can blow water vapor and smoke to the outside of the battery pack to a certain extent.

[0006] The present application provides an explosion-proof structure for a battery pack; comprising a housing, a pressure relief valve, a fire filter component and a fan component;

[0007] The housing is surrounded by an installation space, and the pressure relief valve, the fire filter component and the fan component are sequentially arranged in the installation space at intervals along a first direction;

[0008] The fan component comprises a driving part, a rotating part and a blade part connected to the rotating part;

[0009] The rotating part is fixed to the fire filter component through a bearing, and the driving part is connected to the rotating part and can drive the rotating part to rotate. The rotation of the rotating part can drive the fan blade part to rotate, so that the fan blade part can discharge water vapor and / or smoke in the battery pack to the outside of the battery pack.

[0010] In the above technical solution, further, the rotating part is a rotating shaft, the fan blade part is a fan blade, and the driving part is a driving motor;

[0011] The fan blades are provided in plurality, and the plurality of fan blades are arranged at intervals at one end of the rotating shaft along the circumferential direction of the rotating shaft;

[0012] The other end of the rotating shaft is fixed to the fire filter component through the bearing;

[0013] The output shaft of the driving motor is connected to the rotating shaft and can drive the rotating shaft to rotate.

[0014] In the above technical solution, further, the fan blades are provided with three;

[0015] The three fan blades are arranged on the rotating shaft at equal intervals.

[0016] In the above technical solution, further, the fire filtering component includes a fire filtering net;

[0017] The fire filter net comprises a body, and the body is provided with fire filter holes;

[0018] A plurality of the fire filter holes are provided, and the plurality of the fire filter holes are arranged in a matrix on the main body.

[0019] In the above technical solution, further, the rotation axis is arranged at the center position of the body.

[0020] In the above technical solution, further, the fire filter hole is prismatic.

[0021] In the above technical solution, further, the explosion-proof structure for the battery pack also includes a power switch;

[0022] The power switch is arranged on the housing, and the power switch is connected to the driving motor through a power supply line;

[0023] The outer layer of the power supply line is provided with a fireproof layer.

[0024] In the above technical solution, further, a passing space is formed between the pressure relief valve and the fire filter component;

[0025] The power supply line is located in the through space.

[0026] In the above technical solution, further, the fire filter hole is not provided at the position of the main body corresponding to the power supply line.

[0027] The present application also provides a battery pack, comprising the above-mentioned explosion-proof structure for the battery pack.

[0028] Compared with the prior art, this application has the following beneficial effects:

[0029] The present application also provides an explosion-proof structure for a battery pack; comprising a housing, a pressure relief valve, a fire filter component and a fan component;

[0030] The housing is surrounded by an installation space, and the pressure relief valve, the fire filter component and the fan component are sequentially arranged in the installation space at intervals along a first direction;

[0031] The fan component comprises a driving part, a rotating part and a blade part connected to the rotating part;

[0032] The rotating part is fixed to the fire filter component through a bearing, and the driving part is connected to the rotating part and can drive the rotating part to rotate. The rotation of the rotating part can drive the fan blade part to rotate, so that the fan blade part can discharge water vapor and / or smoke in the battery pack to the outside of the battery pack.

[0033] In summary, when the battery pack suffers from thermal runaway due to overcharging, over-discharging, short circuit, etc., the pressure relief valve, fire filter component and fan component are activated at the same time. The pressure relief valve and fire filter component can achieve double-layer pressure relief for the battery pack, and the fan component can blow water vapor and smoke to the outside of the battery pack in time, which is more in line with contemporary needs for battery packs.

[0034] The present application also provides a battery pack, including the above-mentioned explosion-proof structure for battery packs. Therefore, it has all the beneficial effects of the explosion-proof structure for battery packs, which will not be elaborated in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0036] Figure 1 This is a schematic structural diagram of the explosion-proof structure for a battery pack provided in Example 1 of the present application at a first viewing angle;

[0037] Figure 2 This is a schematic structural diagram of the explosion-proof structure for a battery pack provided in Example 1 of the present application at a second viewing angle;

[0038] Figure 3 for Figure 2 Schematic diagram of the structure of the hidden fire filter component.

[0039] Figure markings: 1-housing; 2-pressure relief valve; 3-fire filter component; 4-fan component; 5-installation space; 6-first direction; 7-rotation axis; 8-fan blades; 9-fire filter hole; 10-main body; 11-power switch; 12-power line; 13-shielding portion. DETAILED DESCRIPTION

[0040] The following specific embodiments are provided to help the reader obtain a comprehensive understanding of the methods, devices and / or systems described herein. However, after understanding the disclosure of the present application, various changes, modifications and equivalents of the methods, devices and / or systems described herein will be apparent. For example, the order of operations described herein is merely an example, and is not limited to the order set forth herein, but in addition to the operations that must occur in a particular order, changes that will be apparent after understanding the disclosure of the present application may be made. In addition, in order to improve clarity and brevity, descriptions of features known in the art may be omitted.

[0041] The features described herein may be implemented in different forms and should not be interpreted as being limited to the examples described herein. Rather, the examples described herein have been provided only to illustrate some of the many possible ways of implementing the methods, devices and / or systems described herein that will be apparent after understanding the disclosure of the present application.

[0042] Throughout the specification, when an element (such as a layer, a region, or a substrate) is described as being “on”, “connected to”, “bound to”, “over”, or “covering” another element, it may be directly “on”, “connected to”, “bound to”, “over”, or “covering” another element, or one or more other elements may be present between them. In contrast, when an element is described as being “directly on”, “directly connected to”, “directly bound to”, “directly over”, or “directly covering” another element, there may be no other elements present between them.

[0043] As used herein, the term "and / or" includes any one of the associated listed items and any combination of any two or more items.

[0044] Although terms such as "first," "second," and "third" may be used herein to describe various members, components, regions, layers, or portions, these members, components, regions, layers, or portions are not limited by these terms. Rather, these terms are only used to distinguish one member, component, region, layer, or portion from another member, component, region, layer, or portion. Therefore, without departing from the teachings of the examples described herein, the first member, component, region, layer, or portion referred to may also be referred to as the second member, component, region, layer, or portion.

[0045] For ease of description, spatial relational terms such as "above", "upper", "below", and "lower" may be used herein to describe the relationship of one element to another element as shown in the accompanying drawings. Such spatial relational terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the accompanying drawings. For example, if the device in the accompanying drawings is turned over, an element described as being "above" or "upper" relative to another element will subsequently be "below" or "lower" relative to the other element. Therefore, the term "above" includes both "above" and "below" orientations depending on the spatial orientation of the device. The device may also be positioned in other ways (e.g., rotated 90 degrees or in other orientations), and the spatial relational terms used herein will be interpreted accordingly.

[0046] The terms used herein are only used to describe various examples and are not used to limit the present disclosure. Unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. The terms "include", "comprise" and "have" list the stated features, quantities, operations, components, elements and / or their combinations that exist, but do not exclude the existence or addition of one or more other features, quantities, operations, components, elements and / or their combinations.

[0047] Variations in the shapes shown in the drawings may occur due to manufacturing techniques and / or tolerances. Therefore, the examples described herein are not limited to the specific shapes shown in the drawings but include variations in shapes that occur during manufacturing.

[0048] The features of the examples described herein may be combined in various ways that will be apparent after understanding the disclosure of the present application. In addition, although the examples described herein have various configurations, other configurations are possible as will be apparent after understanding the disclosure of the present application.

[0049] Embodiment 1

[0050] Combine the following Figure 1-Figure 3 An explosion-proof structure for a battery pack provided in this embodiment of the present application is described in detail.

[0051] In this embodiment, an explosion-proof structure for a battery pack is provided; the explosion-proof structure for a battery pack includes a housing 1 , a pressure relief valve 2 , a fire filter component 3 and a fan component 4 .

[0052] Specifically, the shell 1 is surrounded by an installation space 5, and the pressure relief valve 2, the fire filter component 3 and the fan component 4 are arranged in the installation space 5 in sequence along a first direction 6; the first direction 6 here refers to the thickness direction of the shell 1, that is, the fire filter component 3 is arranged between the pressure relief valve 2 and the fan component 4.

[0053] Furthermore, there is a passing space between the fire filter component 3 and the pressure relief valve 2, and between the fire filter component 3 and the fan component 4. The setting of the passing space can ensure that the pressure relief valve 2, the filter component and the fan component 4 can all work normally without interfering with each other.

[0054] Furthermore, when the battery pack is in use and thermal runaway occurs due to overcharging, overdischarging, short circuit, etc., the pressure relief valve 2 opens to discharge the gas generated in the battery pack to the outside of the battery pack, thereby relieving pressure. In addition, the fire filter component 3 can further discharge the gas generated in the battery pack to the outside of the battery pack, thereby reducing the internal pressure of the battery pack.

[0055] Specifically, the fan component 4 has a driving part, a rotating part and a fan blade 8 connected to the rotating part; the rotating part is fixed to the fire filter component 3 through a bearing, that is, the rotation of the rotating part will not drive the rotation of the fire filter component 3; the driving part is connected to the rotating part, and can drive the rotating part to rotate, and the rotation of the rotating part can drive the fan blade 8 to rotate, so that the fan blade 8 can discharge the water vapor and / or smoke in the battery pack to the outside of the battery pack.

[0056] Furthermore, when thermal runaway is caused by overcharging, over-discharging, short circuit, etc., the fan component 4 is turned on to discharge the high-temperature smoke of the battery pack to the outside of the battery pack. In addition, the water vapor can be directly blown to the outside of the battery pack to prevent a large amount of water vapor from accumulating in the battery pack and generating condensation, thereby preventing the insulation failure of the battery pack.

[0057] Furthermore, when thermal runaway is caused by overcharging, over-discharging, short circuit, etc., the fan component 4 is turned on to discharge high-temperature smoke from the battery pack; when the humidity in the battery pack is too high, the fan component can discharge water vapor out of the battery pack to prevent a large amount of water vapor from accumulating in the battery pack and generating condensation, thereby preventing insulation failure of the battery pack.

[0058] In summary, when the battery pack suffers from thermal runaway due to overcharging, over-discharging, short circuit, etc., the pressure relief valve 2, the fire filter component 3 and the fan component 4 are started simultaneously. The pressure relief valve 2 is used to relieve the pressure on the battery pack, the fire filter component plays a fire filtering function, and the fan component 4 can blow the water vapor and smoke to the outside of the battery pack in time, which is more in line with the contemporary demand for battery packs.

[0059] In this embodiment, the rotating part is the rotating shaft 7, the fan blade 8 is the fan blade 8, and the driving part is the driving motor.

[0060] Specifically, a plurality of fan blades 8 are provided, and the plurality of fan blades 8 are arranged at intervals at one end of the rotating shaft 7 along the circumferential direction of the rotating shaft 7; preferably, the rotating shaft 7 is cylindrical, so the plurality of fan blades 8 are arranged at intervals at one end of the rotating shaft 7 along the circumferential direction of the rotating shaft 7.

[0061] Specifically, the output shaft of the driving motor is connected to the rotating shaft 7, and can drive the rotating shaft 7 to rotate. When there is water vapor in the battery pack, the driving motor starts, drives the fan blades 8 to rotate, and blows the water vapor to the outside of the battery pack; in addition, when there is smoke in the battery pack, the driving motor will also start, drives the fan blades 8 to rotate, and blows the smoke to the outside of the battery pack.

[0062] Specifically, the other end of the rotating shaft 7 is fixed to the fire filter component 3 through a bearing; when the driving motor drives the rotating shaft 7 to rotate, the rotating shaft 7 will rotate, while the fire filter component 3 will not rotate at all.

[0063] In this embodiment, three fan blades 8 are provided; the three fan blades 8 are arranged at equal intervals on the rotating shaft 7; that is, there is an angle of 120° between adjacent fan blades 8. After repeated experiments and simulation experiments, it is found that when there are three fan blades 8, the efficiency of blowing away water vapor and smoke is the highest.

[0064] It is worth noting that: due to structural differences, for battery packs of different models, the fan blades 8 can be set to four, five, etc., all within the protection scope of the present application.

[0065] In this embodiment, the fire filtering component 3 comprises a body 10, and a fire filtering hole 9 is provided on the body 10. Preferably, the fire filtering hole 9 is prismatic.

[0066] Specifically, a plurality of fire filter holes 9 are provided, and the plurality of fire filter holes 9 are arranged in a matrix arrangement on the main body 10 .

[0067] In actual application: When the battery pack is in operation, due to overcharging, over-discharging, short circuit and other reasons, a large amount of high-temperature and high-pressure gas is generated inside the battery pack, causing the internal pressure of the battery pack to rise sharply. When the internal pressure of the battery pack is higher than a certain threshold, the high-temperature and high-pressure gas will be ejected from the inside of the battery pack and an open flame will burst out; after the high-temperature and high-pressure gas is ejected from the inside of the battery pack to the main body 10, the fire filter hole 9 on the main body 10 will filter the fire. In addition, there are multiple fire filter holes 9, and the multiple fire filter holes 9 are arranged at intervals on the main body 10. The part of the main body 10 without the fire filter hole 9 (such as the main body 10 around the fire filter hole 9 or the edge of the main body 10) can also block part of the flame that bursts out of the battery pack.

[0068] In this embodiment, the rotating shaft 7 is disposed at the center of the body 10 to ensure that the force acting on the fan component 4 in the housing 1 is balanced and to prevent stress concentration at a certain location.

[0069] In this embodiment, the explosion-proof structure for the battery pack also includes a power switch 11; the power switch 11 is arranged in the shell 1, and the power switch 11 is connected to the drive motor through a power supply line 12; when the power switch 11 is turned on, the drive motor can be started, and when the power switch 11 is turned off, the drive motor is stopped.

[0070] Specifically, the outer layer of the power supply line 12 is provided with a fireproof layer, and the fireproof layer is made of fireproof material. The fireproof material is preferably a high-temperature resistant fiber or mica material to avoid being burned by high-temperature smoke during thermal runaway.

[0071] In this embodiment, a through space is formed between the pressure relief valve 2 and the fire filter component 3, and the power supply line 12 is located in the through space.

[0072] Specifically, the position of the main body 10 corresponding to the power supply line 12 does not have a fire filter hole 9 ; it can be understood that the portion without the fire filter hole 9 is a shielding portion 13 , which protects and shields the power supply line 12 .

[0073] In this embodiment, the power switch 11 is communicatively connected with the control unit of the battery pack. When the humidity in the battery pack is too high or thermal runaway occurs, the control unit can close the power switch 11 of the pressure relief valve 2 and start the fan. The rotation of the fan generates negative pressure here, which can quickly draw the water vapor or high-temperature smoke in the battery pack out of the battery pack for active protection.

[0074] Furthermore, the control unit of the battery pack is understandable to those skilled in the art, such as the battery PLC controller (preferably, the control unit of the battery pack adopts the CMC8.3.3 new generation high-performance battery pack control unit), which is no longer within the scope of protection of the present application because it is not elaborated in detail.

[0075] Embodiment 2

[0076] In this embodiment, a battery pack is provided, including the above-mentioned explosion-proof structure for the battery pack. Therefore, all the beneficial effects of the explosion-proof structure for the battery pack are not elaborated in detail here.

[0077] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. An explosion-proof structure for a battery pack; characterized in that: It includes a shell, a pressure relief valve, a fire filter component and a fan component; The housing is surrounded by an installation space, and the pressure relief valve, the fire filter component and the fan component are sequentially arranged in the installation space at intervals along a first direction; The fan component comprises a driving part, a rotating part and a blade part connected to the rotating part; The rotating part is fixed to the fire filter component through a bearing, and the driving part is connected to the rotating part and can drive the rotating part to rotate. The rotation of the rotating part can drive the fan blade part to rotate, so that the fan blade part can discharge water vapor and / or smoke in the battery pack to the outside of the battery pack.

2. The explosion-proof structure for a battery pack according to claim 1, characterized in that: The rotating part is a rotating shaft, the fan blade part is a fan blade, and the driving part is a driving motor; The fan blades are provided in plurality, and the plurality of fan blades are arranged at intervals at one end of the rotating shaft along the circumferential direction of the rotating shaft; The other end of the rotating shaft is fixed to the fire filter component through the bearing; The output shaft of the driving motor is connected to the rotating shaft and can drive the rotating shaft to rotate.

3. The explosion-proof structure for a battery pack according to claim 2, characterized in that: The fan blades are provided with three; The three fan blades are arranged on the rotating shaft at equal intervals.

4. The explosion-proof structure for a battery pack according to claim 2, characterized in that: The fire filtering component comprises a body, and the body is provided with a fire filtering hole; A plurality of the fire filter holes are provided, and the plurality of the fire filter holes are arranged in a matrix on the main body.

5. The explosion-proof structure for a battery pack according to claim 4, characterized in that: The rotating shaft is arranged at the center of the body.

6. The explosion-proof structure for a battery pack according to claim 4, characterized in that: The fire filter hole is prismatic.

7. The explosion-proof structure for a battery pack according to claim 4, characterized in that: The explosion-proof structure for the battery pack also includes a power switch; The power switch is arranged on the housing, and the power switch is connected to the driving motor through a power supply line; The outer layer of the power supply line is provided with a fireproof layer.

8. The explosion-proof structure for a battery pack according to claim 7, characterized in that: A passing space is formed between the pressure relief valve and the fire filter component; The power supply line is located in the through space.

9. The explosion-proof structure for a battery pack according to claim 7, characterized in that: The fire filter hole is not provided at a position of the main body corresponding to the power supply line.

10. A battery pack, characterized in that: An explosion-proof structure for a battery pack comprising any one of claims 1 to 9.

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