Battery pack and electric device

Abstract

The embodiment of the application provides a battery pack and an electric equipment, and relates to the technical field of the battery pack. The battery pack comprises a shell and a battery located in the shell. The battery and the shell are provided with an exhaust passage. A first pressure release device in communication with the exhaust passage is arranged on the shell. The battery pack further comprises a filling piece. The filling piece is located in the exhaust passage and can absorb moisture. Therefore, when a small amount of water enters the exhaust passage through the first pressure release device, the water can be directly absorbed by the filling piece, so that the water is prevented from being accumulated in the exhaust passage and from affecting the battery due to later shaking and splashing of the battery pack.

Description

Technical Field

[0001] This application relates to the field of battery pack technology, and more particularly to a battery pack and electrical equipment. Background Technology

[0002] The battery pack mainly consists of an outer casing and multiple batteries placed inside the casing. Each battery is generally equipped with a corresponding battery explosion-proof valve for depressurization. The outer casing is also equipped with a battery pack explosion-proof valve, and an exhaust channel is provided inside the casing. The exhaust channel connects the battery explosion-proof valve and the battery pack explosion-proof valve, so that the high-temperature and high-pressure gas released during battery thermal aging can be discharged through the battery pack explosion-proof valve.

[0003] The battery pack explosion-proof valve is used not only for depressurizing the battery pack but also to allow gas to enter the battery pack when the internal pressure is low, thus balancing the internal and external air pressure. Therefore, the battery pack explosion-proof valve is not a one-way gas passage structure. This means that during battery pack use, water may enter the battery pack through the explosion-proof valve, affecting battery performance. However, current technology lacks effective waterproofing measures for battery packs. Summary of the Invention

[0004] This application provides a battery pack and electrical equipment to solve the problem of the lack of effective waterproof protection measures for battery packs in the prior art.

[0005] In a first aspect, embodiments of this application provide a battery pack, including a housing and a battery located inside the housing, wherein the battery and the housing have an exhaust channel, the housing is provided with a first pressure relief device communicating with the exhaust channel, and the pack also includes a filler located inside the exhaust channel, and the filler is capable of absorbing moisture.

[0006] In some possible designs, the first pressure relief device has a first port connected to the sidewall of the exhaust passage, the filler at least partially covering the first port, and the filler having a porous structure to connect the first port and the exhaust passage through holes in the filler.

[0007] In some possible designs, the projection of the first port toward the filler is located within the filler.

[0008] In some possible designs, the filler is foamed silicone, foam, or porous fiber.

[0009] In some possible designs, a moisture sensor is also included, located at the bottom of the exhaust channel, and configured to issue an early warning when the amount of water at the bottom of the exhaust channel exceeds a preset threshold.

[0010] In some possible designs, a battery management system is also included, with the moisture sensor communicatively connected to the battery management system, which is configured to issue the warning alert when the moisture content in the filler exceeds a preset threshold.

[0011] In some possible designs, a flow guide valve is also included, which is disposed within the exhaust passage and is used to guide the gas in the exhaust passage toward the first port.

[0012] In some possible designs, the exhaust passage includes a first sidewall and a second sidewall disposed opposite to each other, and the first pressure relief device is disposed on the first sidewall;

[0013] The flow guide valve includes at least one first flow guide plate, one end of which is connected to the second side wall, and the other end extends from the top of the housing toward the bottom of the housing, and the angle between the first flow guide plate and the second side wall is less than 90°.

[0014] In some possible designs, the end of the filler facing away from the first port extends toward the bottom of the exhaust passage, and the end of the first guide plate adjacent to the filler extends to the top of the first port between the filler and the filler.

[0015] In some possible designs, the flow guide valve further includes at least one second flow guide plate, one end of which is connected to the first sidewall, and the other end extends from the top of the housing toward the bottom of the housing. The angle between the second flow guide plate and the first sidewall is less than 90°, and a gas flow path for gas to pass through is formed between the first flow guide plate and the second flow guide plate.

[0016] In some possible designs, the second guide plate adjacent to the first port is located above the first port.

[0017] In some possible designs, multiple first and second guide vanes are provided, and the first and second guide vanes are arranged alternately along the height direction of the housing.

[0018] In some possible designs, at least one air passage baffle is also included, which is located between the battery and the side wall of the housing to form the exhaust passage between the housing and the air passage baffle. The air passage baffle is provided with a first through hole to introduce the gas emitted by the battery into the exhaust passage through the first through hole.

[0019] In some possible designs, the battery is provided with a second pressure relief device, and at least one of the air passage baffles is located between the second pressure relief device and the housing. The first through hole on the air passage baffle is provided in a one-to-one correspondence with the second pressure relief device, and the first through hole is connected to the exhaust port of the second pressure relief device. The exhaust pressure of the second pressure relief device is greater than the exhaust pressure of the first pressure relief device.

[0020] In some possible designs, multiple air passage baffles are provided, and the multiple air passage baffles are connected in sequence to cooperate with the housing to form the exhaust passage surrounding the outside of the battery, and at least one of the first pressure relief devices is provided on each of the opposite sides of the housing.

[0021] In some possible designs, the housing includes a base plate and a top cover, the base plate having a first frame around its perimeter and the top cover having a second frame around its perimeter, the first frame and the second frame being connected to form a mounting cavity between the base plate and the top cover, the battery and the venting channel being located within the mounting cavity, and the first pressure relief device being disposed on the first frame.

[0022] Secondly, embodiments of this application also provide an electrical device including the battery pack described in any of the first aspects.

[0023] The battery pack and electrical device provided in this application embodiment include a filler, which is located in the venting channel and has the ability to absorb moisture. When water enters the venting channel through the first pressure release device, it absorbs the water in the venting channel. As long as the amount of water entering the venting channel through the first pressure release device does not exceed the absorption capacity of the filler, the filler can continuously absorb the water, thus preventing water from affecting the battery. Therefore, within a certain water ingress range, the filler can play a good waterproof protection role. Attached Figure Description

[0024] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0025] Figure 1 Schematic diagram of the internal structure of the battery pack provided in the embodiments of this application Figure 1 ;

[0026] Figure 2 Schematic diagram of the internal structure of the battery pack provided in the embodiments of this application Figure 2 ;

[0027] Figure 3 This is a schematic diagram of the internal structure of the exhaust channel in the battery pack provided in an embodiment of this application;

[0028] Figure 4 A schematic diagram showing the flow direction of gas and moisture in the exhaust channel of a battery pack provided in an embodiment of this application;

[0029] Figure 5 This is a schematic diagram of the air passage baffle in the battery pack provided in an embodiment of this application.

[0030] Figure label:

[0031] 100 - Outer casing; 110 - First pressure relief device; 111 - First port; 120 - Top cover; 121 - Second frame; 130 - Base plate; 131 - First frame;

[0032] 200 - Exhaust passage; 210 - First sidewall; 220 - Second sidewall;

[0033] 300 - Battery; 310 - Second pressure relief device; 320 - Connecting piece; 330 - Battery pack total negative; 340 - Battery pack total positive;

[0034] 400 - Filler;

[0035] 500-Moisture Sensor;

[0036] 600 - Flow guide valve; 610 - First flow guide plate; 620 - Second flow guide plate;

[0037] 700 - Airway baffle; 710 - First through hole.

[0038] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0039] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0040] In this application, a battery pack refers to a power supply device composed of one or more individual batteries connected in series or parallel. An individual battery refers to an independent electrochemical unit that can directly convert chemical energy into electrical energy through a chemical reaction; such units include, but are not limited to, lead-acid batteries, nickel-cadmium batteries, lithium-ion batteries, lithium iron phosphate batteries, and nickel-metal hydride batteries.

[0041] Currently, battery pack explosion-proof valves are generally located at the bottom of the battery pack for pressure relief. Related technology discloses a battery comprising multiple battery cells and a supporting component. Each battery cell includes a first pressure relief mechanism. The supporting component supports multiple battery cells and includes a first plate and a second plate, which are stacked, with the first plate positioned between the battery cells and the second plate. The first plate has a first through-hole, with the first pressure relief mechanism positioned opposite it. The second plate has a second through-hole, and a flow channel is formed between the first and second plates. This flow channel guides the discharge from the battery cells to the second through-hole when the first pressure relief mechanism is actuated. In the event of thermal runaway in a battery cell, the flow channel can cool the discharge, improving battery reliability.

[0042] While this method can cool the exhaust through the flow channel, it has at least the following drawbacks:

[0043] 1. The battery pack's explosion-proof valve failed to prevent potential external water ingress, which could lead to battery failure.

[0044] 2. The components are complex, with a multi-layered exhaust channel design, resulting in a high failure rate;

[0045] 3. The valve at the bottom of the battery opens and the exhaust is guided out to the outside of the battery pack through multiple guides. The exhaust channel is long and pressure will be lost after multiple turns, and the time is long so that timely warning cannot be given.

[0046] To avoid the aforementioned problems, this application provides a battery pack and electrical equipment. When the battery generates high-temperature and high-pressure emissions, the first pressure release device can be quickly activated to accelerate the discharge of these emissions. Additionally, it can prevent external moisture from accidentally entering the battery pack through the first pressure release device. Furthermore, any small amount of water entering will be absorbed and neutralized by the filler components, minimizing the impact on the internal battery. Finally, a moisture sensor is installed near the explosion-proof valve of the first pack in the exhaust channel. When moisture enters the exhaust channel, a warning will be issued, prompting staff to address the risk promptly and prevent damage to the internal battery.

[0047] The battery pack provided in this application embodiment can be applied to various electrical devices that require battery power, such as electric vehicles, hybrid vehicles, energy storage systems, consumer electronics, medical devices, drones, power tools, backup power systems, and other equipment.

[0048] The technical solution of this application and how the technical solution of this application solves the above-mentioned technical problems are described in detail below with specific embodiments. These specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments. The embodiments of this application will now be described with reference to the accompanying drawings.

[0049] In some embodiments, see Figure 1 and Figure 2 As shown, the battery pack includes a housing 100 and a battery 300 located inside the housing 100. There is an exhaust channel 200 between the battery 300 and the housing 100. A first pressure relief device 110 communicating with the exhaust channel 200 is provided on the housing 100.

[0050] The outer casing 100 can be a box structure, which mainly includes a bottom plate 130 and a top cover 120. The top cover 120 covers the bottom plate 130 to form a mounting cavity. A first frame 131 is provided on the bottom plate 130, and a second frame 121 is provided on the top cover 120. The ends of the first frame 131 and the second frame 121 are connected to each other, forming a mounting cavity between the bottom plate 130 and the top cover 120. The battery 300 and the exhaust channel 200 are both located in the mounting cavity, and the first pressure relief device 110 can be provided on the first frame 131 or the second frame 121.

[0051] It is understood that the upper cover 120 and the bottom plate 130 of the outer casing 100 can also be other structures. For example, the bottom plate 130 may not have a frame, while the upper cover 120 may have a frame, with the upper cover 120 covering the bottom plate 130 to form a mounting cavity. In this case, the first pressure relief device 110 is disposed on the frame of the upper cover 120. Specifically, as long as the upper cover 120 and the bottom plate 130 can be fastened together to form a mounting cavity for installing the battery 300, and the first pressure relief device 110 is disposed on the side wall of the outer casing 100, this embodiment does not impose any limitations on it.

[0052] A second pressure relief device 310 is provided on the battery 300 to release the gas inside the battery 300 when the internal pressure is too high.

[0053] The exhaust passage 200 connects the first pressure relief device 110 and the second pressure relief device 310, guiding the gas discharged from the second pressure relief device 310 to the first pressure relief device 110, and then out of the outer casing 100 through the first pressure relief device 110. Therefore, the exhaust passage 200 can take many forms, as long as it can achieve the purpose of connecting the first pressure relief device 110 and the second pressure relief device 310. This embodiment does not limit it.

[0054] It is understood that both the first pressure relief device 110 and the second pressure relief device 310 are devices used to control and release pressure within the system. They can automatically open to release excess pressure when the pressure reaches a certain value. They can be devices such as explosion-proof valves, pressure relief valves, exhaust valves, and regulating valves. This embodiment does not limit them.

[0055] In some embodiments, see Figure 3 and Figure 4 As shown, where, Figure 4 The arrows in the diagram indicate the gas flow path when the gas is discharged through the first compaction and release device, and the dashed arrows indicate the flow path when the water enters the exhaust channel 200 through the first pressure release device 110. A filler 400 is provided inside the exhaust channel 200, and the filler 400 is made of a water-absorbing material.

[0056] For example, the filler 400 is located between the first pressure relief device 110 and the battery 300. Water entering the battery pack through the first pressure relief device 110 needs to pass through the location of the filler 400 to come into contact with the battery 300 through the exhaust channel 200. The water is absorbed by the filler 400 when it passes through the location of the filler 400. At this time, space can be reserved at the bottom of the exhaust channel 200 to install other components.

[0057] For example, the first pressure relief device 110 is located on the side wall of the housing 100, and the filler 400 is located below the first pressure relief device 110. It can be fixed on the side wall of the exhaust channel 200. When water enters the exhaust channel 200 through the first pressure relief device 110 and flows downward under the action of gravity, the filler 400 can directly absorb the water.

[0058] For example, the filler 400 is located at the bottom of the venting channel 200, meaning the bottom of the filler 400 is in contact with the bottom of the venting channel 200. During battery pack use, water enters the venting channel 200 through the first pressure release device 110 and falls to the bottom of the venting channel 200 under gravity. The water at the bottom of the venting channel 200 is absorbed by the filler 400. Even if only a small amount of water accidentally enters the venting channel 200 through the first pressure release device 110, it will be directly absorbed by the filler 400, ensuring no free water in the venting channel 200. This prevents free water from contacting the battery 300 when the battery pack is shaken, thus providing good waterproof protection through the filler 400. Furthermore, as long as the water entering the battery pack does not exceed the water absorption threshold of the filler 400, the filler 400 can continuously absorb water. Once the absorption threshold is reached, it can be replaced.

[0059] It is understood that the above example is only an illustration of the possible installation positions of the filler 400. The filler 400 can be located at any position in the exhaust channel 200, as long as it can absorb the water entering the exhaust channel and does not affect the discharge of the gas discharged by the battery 300 through the first pressure relief device 110 during thermal runaway. This embodiment does not limit it.

[0060] In some embodiments, see Figure 3 As shown, the first pressure relief device 110 has a first port 111 connected to the exhaust channel 200. The first port 111 is located on the side wall of the exhaust channel 200. The filler 400 at least partially covers the first port 111, that is, the filler 400 is located below the first pressure relief device 110. If the bottom of the filler 400 contacts the bottom of the exhaust channel 200, then the height of the filler 400 extending upward from the bottom of the exhaust channel 200 must at least partially cover the lower part of the first port 111. Alternatively, the filler 400 may be partially below the first port 111 and not in contact with the bottom of the exhaust channel 200, while the height of the other part extending upward must at least partially cover the lower part of the first port 111. In addition, the filler 400 has a porous structure to connect the first port 111 and the exhaust channel 200 through holes in the filler 400, so as not to affect the gas discharge through the first port 111. Meanwhile, water entering the exhaust channel 200 through the first port 111 of the first pressure relief device 110 can also directly contact the filler 400 upon entry and be quickly absorbed by the filler 400, thus preventing water splashing from affecting the battery 300.

[0061] Understandably, when the filler 400 is located below the first pressure relief device 110 and does not contact the bottom of the gas channel 200, the filler 400 can fill the corresponding position of the entire exhaust channel 200 to better absorb water and prevent water from splashing upwards when it falls into the bottom of the exhaust channel 200.

[0062] When the filler 400 is located at the bottom of the gas channel 200, the filler 400 can completely cover the bottom of the exhaust channel 200, or it can be set only in a part of the exhaust channel 200. When it is set only in a part, it needs to be set at the position of each first pressure relief device 110. In this way, as long as water enters at the position of the first pressure relief device 110, the filler 400 can absorb the water, so that the battery pack has a certain defense against slight water ingress.

[0063] In addition, the filler 400 only needs to be made of a material with water absorption capacity, and the porous structure can be that the material used to make the filler 400 has pores, or the pores can be artificially made on the filler 400. This embodiment does not limit it.

[0064] For example, the filler 400 can be foamed silicone, foam, or porous fiber. These materials are both absorbent and breathable, providing waterproofing without affecting the pressure relief of the battery 300. Of course, the filler 400 can also be other absorbent materials, and this embodiment does not limit them.

[0065] In addition, the filler 400 can be of any shape, or even be foamed silicone, foam, etc., directly inserted into the corresponding position. This embodiment does not limit it.

[0066] In some embodiments, see Figure 3 As shown, the battery pack also includes a moisture sensor 500, located at the bottom of the venting channel 200. The moisture sensor 500 is used to issue a warning when the water level at the bottom of the venting channel 200 exceeds a preset threshold, so that the user is aware of water ingress into the battery pack and needs to be checked promptly. The preset threshold can be selected according to actual conditions, for example, 0, or any value greater than 0; this embodiment does not limit it. The moisture sensor 500 can determine whether the water level at the bottom of the venting channel 200 exceeds the preset threshold in at least the following ways:

[0067] In the first method, when the filler 400 is located at the bottom of the exhaust channel 200, the detection end of the moisture sensor 500 is connected to the filler 400. When the moisture content in the filler 400 is detected to be greater than a preset threshold, an early warning is issued.

[0068] At this point, the moisture sensor 500 can be a sensor that can measure the absorption of moisture by substances, such as an infrared sensor.

[0069] The second type is where the moisture sensor 500 directly detects the amount of water accumulated at the bottom of the exhaust channel 200 and issues an early warning when the amount of water exceeds a preset threshold. In this case, the moisture sensor 500 can use sensors such as capacitive sensors or resistive sensors.

[0070] In addition, the moisture sensor 500 can issue early warnings on its own, for example, by directly connecting to the backend of a mobile terminal and the power supply of the device using the battery pack, and sending an early warning to the mobile terminal or the backend when the warning conditions are met.

[0071] The battery pack typically also includes a battery management system (BMS), which monitors and manages the battery's status. The moisture sensor 500 can also connect to the BMS. When the moisture sensor 500 detects a leak, the BMS can issue a warning, alerting the user or backend to check the electrical equipment. If it receives information about battery pack insulation failure or leakage, it can determine that the first pressure relief device 110 has failed to seal and is leaking water.

[0072] The number of moisture sensors 500 can be determined based on the actual situation. If the moisture sensors 500 determine whether to issue a warning by detecting the moisture content of the filler 400, then when the filler 400 completely covers the bottom of the exhaust channel 200, a moisture sensor 500 can be installed at certain intervals for detection. However, if the filler 400 is only installed in certain areas, it is advisable to install at least one moisture sensor 500 at each location of the filler 400 to issue a timely warning when there is a large amount of water entering, so as to prevent damage to the battery 300 due to excessive water intake.

[0073] Of course, if the moisture sensor 500 determines whether to issue a warning based on the amount of water accumulated at the bottom of the exhaust channel 200, then the moisture sensor 500 can be installed at any position at the bottom of the exhaust channel 200.

[0074] During battery pack use, if only a trace amount of water accidentally enters the venting channel 200 through the first pressure release device 110, it will be directly absorbed by the filler 400. If the water absorbed by the filler 400 does not reach a preset threshold, or if all the water is absorbed by the filler 400 and no water accumulates at the bottom of the venting channel 200, the moisture sensor 500 will not issue a warning, thus avoiding false alarms. However, if the first pressure release device 110 fails for an extended period or aging and fatigue causes sealing failure, more water will enter. In this case, the moisture sensor 500 can quickly detect it and issue a warning, allowing the user to take timely action and prevent irreversible accidents.

[0075] In some embodiments, see Figure 3 As shown, the projection of the first port 111 toward the filler 400 is located within the filler 400. It can be understood that the first port 111 has a certain width in the horizontal direction, and the portion of the filler 400 that covers the first port 111 has a width greater than the width at the first port 111.

[0076] When water enters the venting channel 200 through the first pressure relief device 110, it can be better absorbed by the filler 400, thereby further improving the waterproof capability of the battery pack and providing better protection for the internal battery 300.

[0077] In some embodiments, see Figure 3 As shown, the battery pack also includes a flow guide valve 600, which is disposed in the exhaust channel 200. The flow guide valve 600 is used to guide the gas in the exhaust channel 200 to flow toward the first port 111, so that when the battery 300 discharges high-temperature and high-pressure gas, it can assist the first pressure relief device 110 to quickly discharge the gas.

[0078] Specifically, the internal structure of the exhaust passage 200 can be designed to form a flow guide valve 600 that helps increase the speed or pressure of the gas reaching the first pressure relief device 110. Of course, the flow guide valve 600 can also be an additional structure added to the exhaust passage 200, and this embodiment does not limit it.

[0079] For example, the exhaust passage 200 includes a first sidewall 210 and a second sidewall 220 disposed opposite to each other, and a first pressure relief device 110 is disposed on the first sidewall 210.

[0080] The flow guide valve 600 includes at least one first flow guide plate 610. One end of the first flow guide plate 610 is connected to the second side wall 220, and the other end extends from the top of the housing 100 toward the bottom of the housing 100. The angle between the first flow guide plate 610 and the second side wall 220 is less than 90°, that is, the first flow guide plate 610 is inclined toward the first pressure relief device 110. The gas discharged from the battery 300 can be guided and accelerated by the first flow guide plate 610 during the process of passing through the exhaust channel 200 to reach the first pressure relief device 110, so as to start the first pressure relief device 110 more quickly, accelerate the discharge of gas inside the battery pack, and improve the pressure relief speed.

[0081] One or more first guide vanes 610 can be provided. When multiple first guide vanes 610 are provided, they can be arranged sequentially along the height of the second sidewall 220. Of course, the included angle between different first guide vanes 610 and the second sidewall 220 can be the same or different, as long as adjacent first guide vanes 610 do not intersect. This embodiment does not limit this.

[0082] In addition, to improve the waterproof effect of the battery pack, the end of the first guide plate 610 adjacent to the filler 400 can be extended to the top of the first port 111 between the filler 400 and the filler 400. The side of the first guide plate 610 away from the second side wall 220 extends towards the first side wall 210, forming a triangular structure with the filler 400 and the second side wall 220. This can achieve a certain water-blocking effect through the first guide plate 610, preventing water from contacting the battery 300 when a small amount of water enters.

[0083] In some embodiments, see Figure 3 As shown, the flow guide valve 600 also includes at least one second flow guide plate 620. One end of the second flow guide plate 620 is connected to the first side wall 210, and the other end extends from the top of the housing 100 toward the bottom of the housing 100. The angle between the second flow guide plate 620 and the first side wall 210 is less than 90°. A gas flow path for gas to pass through is formed between the first flow guide plate 610 and the second flow guide plate 620.

[0084] Both the first guide plate 610 and the second guide plate 620 extend in the direction of the gas flow discharged from the battery 300 toward the first pressure relief device 110, which can quickly activate the first pressure relief device 110 to release pressure. At the same time, the second guide plate 620 and the first guide plate 610 work together to block water on the side facing the bottom of the exhaust channel 200, preventing water from splashing upwards and affecting the battery 300.

[0085] It is understood that one or more second guide vanes 620 may be provided. The included angle between different second guide vanes 620 and the first sidewall 210 may be the same or different. This embodiment does not limit this.

[0086] The second guide plate 620, which is adjacent to the first port 111, is located above the first port 111 to avoid affecting the gas entering and exiting the first pressure relief device 110.

[0087] In some embodiments, multiple first guide plates 610 and second guide plates 620 are provided, and the first guide plates 610 and second guide plates 620 are arranged alternately along the height direction of the housing 100. This allows the gas discharged from the battery 300 to be accelerated through the exhaust channel 200 via the first guide plates 610 and second guide plates 620, thereby activating the first pressure relief device 110 more quickly for rapid pressure relief.

[0088] When multiple first guide vanes 610 and multiple second guide vanes 620 are provided, the second guide vanes 620 have multiple different tilt angles, that is, the angle between the second guide vanes 620 and the first sidewall 210 has multiple different values. The first guide vanes 610 also have multiple different tilt angles, that is, the angle between the first guide vanes 610 and the second sidewall 220 also has multiple different values, thereby further accelerating the gas discharge.

[0089] If the first pressure relief device 110 fails due to prolonged malfunction or aging fatigue leading to seal failure, and if the battery pack is submerged in water or the electrical equipment is used in rainy weather, external water will enter the battery pack through the first pressure relief device 110. At this time, both the first guide plate 610 and the second guide plate 620 will have a decelerating and reverse effect on the entering water, preventing the water from splashing upwards or moving rapidly, and guiding the water downwards into the lower area of ​​the exhaust channel 200 where the filler 400 is located. At this time, the filler 400 will absorb some water, and the excess water will overflow to other positions at the bottom of the exhaust channel 200 and come into contact with the moisture sensor 500. At this time, the moisture sensor 500 will issue a warning, informing the user or the backend that the battery pack needs to be inspected and verified as soon as possible to prevent irreparable major accidents.

[0090] In some embodiments, see Figure 1 , Figure 2 and Figure 5 As shown, the battery pack also includes at least one air passage baffle 700, which is located between the battery 300 and the side wall of the housing 100 to form an exhaust passage 200 between the housing 100 and the air passage baffle 700. The air passage baffle 700 is provided with a first through hole 710 to introduce the gas emitted by the battery 300 into the exhaust passage 200 through the first through hole 710.

[0091] Specifically, the base plate 130 in the housing 100 is provided with multiple mounting parts, each of which can fix one battery 300. Multiple batteries 300 are connected together by connecting pieces 320. The connecting pieces 320 can achieve the required pressure and capacitance by connecting multiple batteries 300 in series or parallel. In series connection, the connecting pieces 320 connect the positive terminals of multiple batteries 300 to the negative terminal of the last battery 300, ultimately forming a battery pack with a higher voltage. In this case, the connecting pieces 320 need to connect the positive terminal of the last battery 300 to the total positive terminal 340 of the battery pack and the negative terminal of the first battery 300 to the total negative terminal 330 of the battery pack. In parallel connection, the connecting pieces 320 connect the positive terminals and negative terminals of multiple batteries 300 together to increase the capacity of the battery pack. In this case, the connecting pieces 320 need to connect the positive terminals of all batteries 300 to the total positive terminal 340 of the battery pack and the negative terminals of all batteries 300 to the total negative terminal 330 of the battery pack.

[0092] An air duct baffle 700 can be installed between the outermost mounting section and the first frame 131 and the second frame 121. The air duct baffle 700 can be directly connected to the base plate 130, the top cover 120, the first frame 131, and the second frame 121, creating an exhaust channel 200 within the mounting cavity that is separated from the area where the battery 300 is installed. Alternatively, the air duct baffle 700 can simply be connected to the first frame 131 and the second frame 121, creating an exhaust channel 200 that is slightly lower than the height of the mounting cavity.

[0093] Understandably, the second pressure relief device 310 on the battery 300 is generally located at the end of the terminal post of the battery 300. When the battery 300 is installed in the mounting cavity, the terminal post generally faces the side wall of the outer casing 100. However, when installing the battery 300, the positive and negative terminals of the battery 300 may need to face different directions. Therefore, the second pressure relief device 310 may exist on both sides of the battery 300 with the terminal post. Regardless of whether there is a second pressure relief device 310 on both sides or only on one side, for the side with the second pressure relief device 310, an exhaust channel 200 needs to be provided between the side wall of the outer casing 100 and the battery 300. This arrangement allows the gas discharged through the second pressure relief device 310 on the battery 300 to be directly discharged from the exhaust channel 200 located on the outside of the battery 300, shortening the gas flow path and accelerating gas discharge.

[0094] In some embodiments, at least one airway baffle 700 is located between the second pressure relief device 310 and the housing 100. The first through hole 710 on the airway baffle 700 is provided in a one-to-one correspondence with the second pressure relief device 310, and the first through hole 710 is connected to the exhaust port of the second pressure relief device 310. The exhaust pressure of the second pressure relief device 310 is greater than the exhaust pressure of the first pressure relief device 110.

[0095] Specifically, at least on the side of the battery 300 where the second pressure relief device 310 is located, a gas passage baffle 700 needs to be provided. The first through hole 710 on the gas passage baffle 700 is directly connected to the exhaust port of each second pressure relief device 310. Of course, the gas passage baffles 700 at other locations do not need to be provided with the first through hole 710, so that when a battery 300 discharges high-temperature and high-pressure gas through the second pressure relief device 310, the high-temperature and high-pressure gas can directly enter the exhaust channel 200 through the first through hole 710, reducing its impact on adjacent batteries 300.

[0096] Meanwhile, the exhaust pressure of the second pressure release device 310 is greater than that of the first pressure release device 110. When the high-temperature and high-pressure gas passes through the exhaust channel 200, it will not cause the second pressure release device 310 of other batteries 300 to open. The high-temperature and high-pressure gas will be directly discharged from the battery pack through the first pressure release device 110, which can further reduce the impact on the surrounding batteries 300.

[0097] In addition, multiple gas baffles can be provided, and multiple gas baffles 700 can be connected in sequence to form an exhaust channel 200 on any one or more sides of the battery 300.

[0098] Of course, please see Figure 1As shown, the air passage baffle 700 can also be directly fitted with the housing 100 to form an exhaust passage 200 that is arranged around the outside of the battery 300. In this case, at least one first pressure relief device 110 is provided on each of the opposite sides of the housing 100.

[0099] Of course, the first pressure relief device 110 can also be provided on each side wall of the outer casing 100, but this embodiment does not limit it.

[0100] For example, two first pressure relief devices 110 can be provided on each of the two opposite sidewalls of the housing 100. These two sidewalls are adjacent to the sidewalls of the housing 100 corresponding to the second pressure relief device 310. Thus, the gas discharged from the battery 300 through the second pressure relief device 310 can be temporarily stored and guided through the exhaust channel 200 surrounding all batteries 300. Then, the pressure can be released by multiple first pressure relief devices 110 together, which can effectively improve the pressure release speed and avoid excessive internal pressure of the battery pack due to slow pressure release speed.

[0101] According to some embodiments of this application, this application also provides an electrical device, which includes the battery pack in the above embodiments. The battery pack is mainly used to supply power to the electrical device. The electrical device can be an electric vehicle, a hybrid vehicle, an energy storage system, a consumer electronics product, a medical device, a drone, a power tool, a backup power system, or other devices that require electricity. This embodiment does not limit such devices.

[0102] Finally, it should be noted that other embodiments of this application will readily conceive of by those skilled in the art upon consideration of the specification and practice of the application disclosed herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein, and is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and alterations may be made without departing from its scope. The scope of this application is limited only by the appended claims.

Claims

1. A battery pack, comprising a housing (100) and a battery (300) located within the housing (100), wherein a venting channel (200) is provided between the battery (300) and the housing (100), and a first pressure relief device (110) communicating with the venting channel (200) is provided on the housing (100), the first pressure relief device (110) being disposed on a side wall of the housing (100), characterized in that, It also includes a filler (400) located within the exhaust channel (200) and the filler (400) is capable of absorbing moisture; The first pressure relief device (110) has a first port (111) connected to the side wall of the exhaust passage (200), the filler (400) at least partially covers the first port (111), and the filler (400) has a porous structure to connect the first port (111) and the exhaust passage (200) through holes in the filler (400); It also includes a flow guide valve (600), which is disposed in the exhaust passage (200) and is used to guide the gas in the exhaust passage (200) toward the first port (111); The flow guide valve (600) includes at least one first flow guide plate (610), the filler (400) extends away from the first port (111) toward the bottom of the exhaust passage (200), and the end of the first flow guide plate (610) adjacent to the filler (400) extends to the top of the first port (111) between the filler (400) and the filler (400); The exhaust passage (200) includes a second sidewall (220), which is disposed opposite to the sidewall of the housing (100). One end of the first guide plate (610) is connected to the second sidewall (220), and the other end extends from the top of the housing (100) toward the bottom of the housing (100). The included angle between the first guide plate (610) and the second sidewall (220) is less than 90°.

2. The battery pack according to claim 1, characterized in that, The projection of the first port (111) toward the filler (400) is located within the filler (400).

3. The battery pack according to claim 1, characterized in that, The filler (400) is foamed silicone, foam, or porous fiber.

4. The battery pack according to claim 1, characterized in that, It also includes a moisture sensor (500) located at the bottom of the exhaust channel (200), which is configured to issue an early warning when it detects that the amount of water at the bottom of the exhaust channel (200) is greater than a preset threshold.

5. The battery pack according to claim 4, characterized in that, It also includes a battery management system, the moisture sensor (500) being communicatively connected to the battery management system, the battery management system being configured to issue the warning alert when the amount of water at the bottom of the venting channel (200) exceeds a preset threshold.

6. The battery pack according to claim 5, characterized in that, The exhaust passage (200) also includes a first sidewall (210) disposed opposite to the second sidewall (220), and the first pressure relief device (110) is disposed on the first sidewall (210).

7. The battery pack according to claim 6, characterized in that, The flow guide valve (600) further includes at least one second flow guide plate (620), one end of which is connected to the first sidewall (210), and the other end extends from the top of the housing (100) toward the bottom of the housing (100). The angle between the second flow guide plate (620) and the first sidewall (210) is less than 90°, and a gas flow path for gas to pass through is formed between the first flow guide plate (610) and the second flow guide plate (620).

8. The battery pack according to claim 7, characterized in that, The second guide plate (620) adjacent to the first port (111) is located above the first port (111).

9. The battery pack according to claim 7, characterized in that, Multiple first guide plates (610) and second guide plates (620) are provided, and the first guide plates (610) and second guide plates (620) are arranged alternately along the height direction of the outer shell (100).

10. The battery pack according to any one of claims 1-9, characterized in that, It also includes at least one air passage baffle (700) located between the battery (300) and the housing (100) to form the exhaust passage (200) between the housing (100) and the air passage baffle (700). The air passage baffle (700) is provided with a first through hole (710) to introduce the gas emitted by the battery (300) into the exhaust passage (200) through the first through hole (710).

11. The battery pack according to claim 10, characterized in that, The battery (300) is provided with a second pressure relief device (310), and at least one of the air passage baffles (700) is located between the second pressure relief device (310) and the outer casing (100). The first through hole (710) on the air passage baffle (700) is provided in a one-to-one correspondence with the second pressure relief device (310), and the first through hole (710) is connected to the exhaust port of the second pressure relief device (310). The exhaust pressure of the second pressure relief device (310) is greater than the exhaust pressure of the first pressure relief device (110).

12. The battery pack according to claim 10, characterized in that, Multiple airway baffles (700) are provided, and the multiple airway baffles (700) are connected in sequence to cooperate with the housing (100) to form the exhaust channel (200) surrounding the battery (300). At least one first pressure relief device (110) is provided on each of the opposite sides of the housing (100).

13. The battery pack according to any one of claims 1-9, characterized in that, The housing (100) includes a base plate (130) and a top cover (120). The base plate (130) has a first frame (131) around its perimeter, and the top cover (120) has a second frame (121) around its perimeter. The first frame (131) and the second frame (121) are connected to form a mounting cavity between the base plate (130) and the top cover (120). The battery (300) and the exhaust channel (200) are both located in the mounting cavity. The first pressure relief device (110) is disposed on the first frame (131).

14. An electrical appliance, characterized in that, Includes the battery pack as described in any one of claims 1-13.

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