Battery pack and electric equipment

Abstract

The embodiment of the invention provides a battery pack and electric equipment, and relates to the technical field of battery packs, the battery pack comprises a shell and a battery located in the shell, an exhaust channel is arranged between the battery and the shell, the shell is provided with a first pressure release device communicated with the exhaust channel, the battery pack further comprises a filling piece, the filling piece is located in the exhaust channel, and the first pressure release device is communicated with the first pressure release device. And the filling piece can absorb water, so that a small amount of water can be directly absorbed by the filling piece when entering the exhaust channel accidentally through the first pressure release device, and the entering water is prevented from being accumulated in the exhaust channel and the influence on the battery due to shaking and splashing of the battery pack in the later period is avoided.

Description

Technical Field

[0001] The present application relates to the technical field of battery packs, and in particular to a battery pack and an electrical device. Background Art

[0002] The battery pack mainly includes an outer shell and multiple batteries placed in the outer shell. Each battery is generally provided with a corresponding battery explosion-proof valve for battery pressure relief. The outer shell is also provided with a battery pack explosion-proof valve, and an exhaust channel is provided in the outer shell. 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 thermal aging of the battery can be discharged through the battery pack explosion-proof valve.

[0003] The battery pack explosion-proof valve is not only used to release the pressure of the battery pack, but also used to allow gas to enter the battery pack when the internal pressure of the battery pack is low, so as to balance the air pressure inside and outside the battery pack. Therefore, the battery pack explosion-proof valve is not a structure that only allows gas to pass through in one direction. This results in water entering the battery pack through the battery pack explosion-proof valve during the use of the battery pack, affecting the use of the battery. However, the existing technology lacks effective measures to protect the battery pack from water ingress. Summary of the invention

[0004] The embodiments of the present application provide a battery pack and an electrical device to solve the problem of lack of effective water ingress protection measures for the battery pack in the prior art.

[0005] In a first aspect, an embodiment of the present application provides a battery pack, comprising a shell and a battery located in the shell, wherein an exhaust channel is provided between the battery and the shell, a first pressure release device connected to the exhaust channel is provided on the shell, and the shell also comprises a filler, wherein the filler is located in the exhaust channel and can absorb moisture.

[0006] In some possible designs, the first pressure release device has a first port connected to the side wall of the exhaust channel, the filling piece at least partially covers the first port, and the filling piece is a porous structure to connect the first port and the exhaust channel through the holes on the filling piece.

[0007] In some possible designs, a projection of the first port toward the filling piece is located inside the filling piece.

[0008] In some possible designs, the filling piece is foamed silica gel, foam cotton or porous fiber piece.

[0009] In some possible designs, a moisture sensor is further included. The moisture sensor is located at the bottom of the exhaust passage. The moisture sensor is configured to issue an early warning when it detects that the amount of water at the bottom of the exhaust passage is greater than a preset threshold.

[0010] In some possible designs, a battery management system is further included, the moisture sensor is communicatively connected to the battery management system, and the battery management system is configured to issue the early warning reminder when the moisture content in the filling member is greater than a preset threshold.

[0011] In some possible designs, a guide valve is further included. The guide valve is disposed in the exhaust channel, and the guide valve is used to guide the gas in the exhaust channel to flow toward the first port.

[0012] In some possible designs, the exhaust passage includes a first side wall and a second side wall that are oppositely disposed, and the first pressure release device is disposed on the first side wall;

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

[0014] In some possible designs, one end of the filling piece 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 filling piece extends to between the top of the first port and the filling piece.

[0015] In some possible designs, the guide valve also includes at least one second guide plate, one end of the second guide plate is connected to the first side wall, and the other end extends from the top of the outer shell toward the bottom of the outer shell, the angle between the second guide plate and the first side wall is less than 90°, and a gas flow path for gas to pass through is formed between the first guide plate and the second 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, a plurality of the first guide plates and a plurality of the second guide plates are provided, and the first guide plates and the second guide plates are alternately arranged in sequence along the height direction of the shell.

[0018] In some possible designs, at least one airway baffle is further included, and the airway baffle is located between the battery and the side wall of the outer shell to form the exhaust channel between the outer shell and the airway baffle, and a first through hole is provided on the airway baffle to introduce the gas discharged from the battery into the exhaust channel through the first through hole.

[0019] In some possible designs, a second pressure release device is provided on the battery, at least one airway baffle is located between the second pressure release device and the outer shell, the first through holes on the airway baffle are arranged one-to-one with the second pressure release device, and the first through holes are connected to the exhaust port of the second pressure release device, and the exhaust pressure of the second pressure release device is greater than the exhaust pressure of the first pressure release device.

[0020] In some possible designs, a plurality of the airway baffles are provided, and the plurality of the airway baffles are connected in sequence to cooperate with the outer shell to form the exhaust channel arranged in a ring around the outside of the battery, and at least one first pressure release device is provided on each of the opposite sides of the outer shell.

[0021] In some possible designs, the housing includes a base plate and an upper cover, the base plate is surrounded by a first frame, the upper cover is surrounded by a second frame, the first frame and the second frame are connected to form an installation cavity between the base plate and the upper cover, the battery and the exhaust channel are both located in the installation cavity, and the first pressure release device is arranged on the first frame.

[0022] In a second aspect, an embodiment of the present application further provides an electrical device, comprising a battery pack as described in any one of the first aspects.

[0023] In the battery pack and electrical equipment provided in the embodiments of the present application, the battery pack includes a filling piece, which is located in the exhaust channel and has the ability to absorb moisture. When water enters the exhaust channel through the first pressure release device, the filling piece absorbs the water in the exhaust channel. As long as the amount of water entering the exhaust channel through the first pressure release device does not exceed the absorption amount of the filling piece, the filling piece can continue to absorb the incoming water to avoid the impact of water on the battery, so that within a certain water inlet range, the filling piece can provide better waterproof protection. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

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

[0027] Figure 3 A schematic diagram of the internal structure of the exhaust channel in the battery pack provided in an embodiment of the present application;

[0028] Figure 4 A schematic diagram of the flow of gas and water in the exhaust channel of the battery pack provided in an embodiment of the present application;

[0029] Figure 5 A schematic diagram of the structure of the airway baffle in the battery pack provided in an embodiment of the present application.

[0030] Reference numerals:

[0031] 100 - housing; 110 - first pressure release device; 111 - first port; 120 - upper cover; 121 - second frame; 130 - bottom plate; 131 - first frame;

[0032] 200-exhaust channel; 210-first side wall; 220-second side wall;

[0033] 300 - battery; 310 - second pressure release device; 320 - connecting piece; 330 - total negative of battery pack; 340 - total positive of battery pack;

[0034] 400-filler;

[0035] 500- moisture sensor;

[0036] 600- diversion valve; 610- first diversion plate; 620- second diversion plate;

[0037] 700 - airway baffle; 710 - first through hole.

[0038] The above drawings have shown clear embodiments of the present application, which will be described in more detail later. These drawings and text descriptions are not intended to limit the scope of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0039] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the following exemplary embodiments do not represent all implementations consistent with the present application. Instead, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the appended claims.

[0040] The battery pack in this application refers to a power supply device composed of one or more single cells connected in series or in parallel. A single cell body refers to an independent electrochemical unit that can directly convert chemical energy into electrical energy through chemical reactions, including but not limited to lead-acid batteries, nickel-cadmium batteries, lithium-ion batteries, lithium iron phosphate batteries, and nickel-metal hydride batteries.

[0041] At present, the explosion-proof valve of the battery pack is generally set at the bottom of the battery pack to release pressure from the bottom. In the related art, a battery is disclosed, which includes a plurality of battery cells and a support component. The battery cell includes a first pressure relief mechanism. The support component is used to support a plurality of battery cells, and the support component includes a first plate body and a second plate body, and the first plate body and the second plate body are stacked, and the first plate body is located between the plurality of battery cells and the second plate body. Among them, the first plate body is provided with a first through hole, the first pressure relief mechanism is arranged opposite to the first through hole, the second plate body is provided with a second through hole, and a guide channel is formed between the first plate body and the second plate body, and the guide channel is used to guide the discharge of the battery cell to the second through hole when the first pressure relief mechanism is actuated. When thermal runaway occurs in the battery cell, the guide channel can cool the discharge, thereby improving the reliability of the battery.

[0042] Although this method can cool the exhaust through the guide channel, it has at least the following disadvantages:

[0043] 1. The explosion-proof valve of the battery pack fails to prevent possible external water ingress, which may cause battery failure;

[0044] 2. The components are complex, the exhaust channel is designed with multiple layers, and the failure rate is high;

[0045] 3. A valve is opened at the bottom of the battery, which is guided out to the outside of the battery pack after multiple times. The exhaust passage is long, and the pressure will be lost after multiple turns, and it will take a long time for an early warning to be issued.

[0046] In order to avoid the above-mentioned problems, the embodiments of the present application provide a battery pack and an electrical equipment. When the battery generates high temperature and high pressure emissions, the battery pack can quickly start a first pressure release device to accelerate the discharge of high temperature and high pressure emissions; in addition, it can prevent moisture from outside the battery pack from accidentally entering the battery pack through the first pressure release device, and a small amount of incoming water will be absorbed and offset by the filling member, thereby minimizing the impact on the internal battery. Finally, a moisture sensor is reserved in the exhaust channel near the first explosion-proof valve. When moisture enters the exhaust channel, an early warning reminder will be issued to remind the staff to deal with the risk as soon as possible to avoid damage to the internal battery.

[0047] The battery pack provided in the embodiments of the present application can be applicable to various electrical devices that need to be powered by a battery pack, such as electric vehicles, hybrid vehicles, energy storage systems, consumer electronic products, medical equipment, drones, power tools, backup power systems and other equipment.

[0048] The technical solution of the present application and how the technical solution of the present application solves the above-mentioned technical problems are described in detail below with specific embodiments. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments. The embodiments of the present application will be described below in conjunction with 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 in the housing 100 , an exhaust channel 200 is provided between the battery 300 and the housing 100 , and a first pressure release device 110 connected to the exhaust channel 200 is provided on the housing 100 .

[0050] Among them, the shell 100 can be a box structure, which mainly includes a bottom plate 130 and an upper cover 120. The upper cover 120 is covered on the bottom plate 130 to form an installation cavity. A first frame 131 is set on the bottom plate 130, and a second frame 121 is set on the upper cover 120. The ends of the first frame 131 and the second frame 121 are connected to each other to form an installation cavity between the bottom plate 130 and the upper cover 120. The battery 300 and the exhaust channel 200 are both located in the installation cavity, and the first pressure release device 110 can be set on the first frame 131 or the second frame 121.

[0051] It is understandable that the upper cover 120 and the bottom plate 130 of the housing 100 may also be other structures, for example, the bottom plate 130 does not have a frame, while the upper cover 120 has a frame, and the upper cover 120 is covered on the bottom plate 130 to form a mounting cavity, and in this case, the first pressure release device 110 is arranged on the frame of the upper cover 120. Specifically, as long as the upper cover 120 and the bottom plate 130 are buckled together to form a mounting cavity for installing the battery 300, and the first pressure release device 110 is arranged on the side wall of the housing 100, this embodiment is not limited thereto.

[0052] The battery 300 is correspondingly provided with a second pressure release device 310 for releasing the gas inside the battery 300 when the internal pressure of the battery 300 is too high.

[0053] The exhaust passage 200 is connected to the first pressure release device 110 and the second pressure release device 310, and guides the gas discharged from the second pressure release device 310 to the first pressure release device 110, and then is discharged from the housing 100 through the first pressure release device 110. Therefore, the exhaust passage 200 can be in various forms, as long as it can achieve the purpose of connecting the first pressure release device 110 and the second pressure release device 310, and this embodiment does not limit it here.

[0054] It can be understood that the first pressure release device 110 and the second pressure release device 310 are both devices for controlling and releasing the pressure in the system. When the pressure reaches a certain value, they can automatically open to release excess pressure. They can be explosion-proof valves, pressure relief valves, exhaust valves, regulating valves and other devices, and this embodiment does not limit them here.

[0055] In some embodiments, see Figure 3 and Figure 4 As shown, Figure 4 The arrow in the figure indicates the gas flow path when the gas is discharged through the first compaction release device, and the dotted arrow indicates the flow path when water enters the exhaust channel 200 through the first pressure release device 110. A filling member 400 is provided in the exhaust channel 200, and the filling member 400 is located in the exhaust channel 200 and is made of a water-absorbent material.

[0056] Exemplarily, the filling piece 400 is located between the first pressure release device 110 and the battery 300. If the water that enters the battery pack through the first pressure release device 110 wants to contact the battery 300 through the exhaust channel 200, it needs to pass through the position of the filling piece 400 and be absorbed by the filling piece 400 when passing through the position of the filling piece 400. At this time, space can be reserved at the bottom of the exhaust channel 200 for installing other components.

[0057] Exemplarily, the first pressure release device 110 is located on the side wall of the outer shell 100, and the filling piece 400 is located below the first pressure release device 110, which can be fixed on the side wall of the exhaust channel 200. When water enters the exhaust channel 200 through the first pressure release device 110 and flows downward under the action of gravity, the filling piece 400 can directly absorb the water.

[0058] Exemplarily, the filler 400 is located at the bottom of the exhaust channel 200, that is, the bottom of the filler 400 contacts the bottom of the exhaust channel 200. During the use of the battery pack, after water enters the exhaust channel 200 through the first pressure release device 110, it will fall to the bottom of the exhaust channel 200 under the action of gravity. At this time, the water falling on the bottom of the exhaust channel 200 will be absorbed by the filler 400, that is, if only a trace amount of water accidentally enters the exhaust channel 200 through the first pressure release device 110, it will be directly absorbed by the filler 400, so that there is no free water in the exhaust channel 200, avoiding the free water from contacting the battery 300 when the battery pack is shaken, so that the filler 400 plays a better waterproof protection role. At the same time, as long as the water entering the battery pack does not exceed the water absorption threshold of the filler 400, the filler 400 can continue to absorb water, and after reaching the absorption threshold, it can also be replaced.

[0059] It can be understood that the above example is only an illustration of the possible installation position of the filling piece 400. The filling piece 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 thermal runaway of the battery 300 through the first pressure release device 110. This embodiment does not limit it here.

[0060] In some embodiments, see Figure 3 As shown, the first pressure release 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, and the filler 400 at least partially covers the first port 111, that is, the filler 400 is located below the first pressure release device 110. If the bottom of the filler 400 contacts the bottom of the exhaust channel 200, the height of the filler 400 extending upward from the bottom of the exhaust channel 200 needs to at least partially cover the lower part of the first port 111, or the filler 400 is partially located below the first port 111 and does not contact the bottom of the exhaust channel 200, and the height of the other part extending upward needs to at least partially cover the lower part of the first port 111. In addition, the filler 400 is a porous structure, so that the first port 111 and the exhaust channel 200 are connected through the holes on the filler 400, so as not to affect the discharge of gas through the first port 111. At the same time, water entering the exhaust channel 200 through the first port 111 of the first pressure release device 110 can also directly contact the filling member 400 when entering, and be quickly absorbed by the filling member 400, thereby preventing water splashing and affecting the battery 300.

[0061] It can be understood that when the filling piece 400 is located below the first pressure release device 110 and does not contact the bottom of the gas channel 200, the filling piece 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 filling piece 400 is located at the bottom of the gas channel 200, the filling piece 400 can completely cover the bottom of the exhaust channel 200, or it can be only provided in a part of the exhaust channel 200. When it is only provided in a part, it needs to be provided at the position of each first pressure release device 110. In this way, as long as water enters the position of the first pressure release device 110, the moisture can be adsorbed by the filling piece 400, so that the battery pack has a certain defense capability against slight water ingress.

[0063] In addition, the filling piece 400 only needs to be made of a material with water absorption ability, and the porous structure can be the material of the filling piece 400 itself with holes, or it can be artificially opened on the filling piece 400, which is not limited in this embodiment.

[0064] For example, the filler 400 may be foamed silica gel, foam or porous fiber. These materials are both water-absorbent and breathable, and while playing a waterproof role, they will not affect the pressure relief of the battery 300. Of course, the filler 400 may also be other water-absorbent materials, which are not limited in this embodiment.

[0065] In addition, the filling piece 400 can also be of any shape, and can even be foamed silica gel, foam cotton, etc., which is directly stuffed into the corresponding position, and this embodiment does not limit it here.

[0066] In some embodiments, see Figure 3 As shown, the battery pack also includes a moisture sensor 500, which is located at the bottom of the exhaust channel 200. The moisture sensor 500 is used 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, so that the user knows that water has entered the battery pack and needs to be checked in time. The preset threshold can be selected according to actual conditions, such as 0, or any value greater than 0, and this embodiment does not limit it here. The moisture sensor 500 can at least determine whether the amount of water at the bottom of the exhaust channel 200 is greater than the preset threshold in the following ways:

[0067] First, when the filling piece 400 is located at the bottom of the exhaust passage 200, the detection end of the moisture sensor 500 is connected to the filling piece 400, and when it is detected that the moisture content in the filling piece 400 is greater than a preset threshold, an early warning is issued.

[0068] At this time, the moisture sensor 500 may be an infrared sensor or other sensor that can measure the moisture absorption of a substance.

[0069] Second, the moisture sensor 500 directly detects the amount of water accumulated at the bottom of the exhaust passage 200, and issues an early warning when the amount of water accumulated is greater than a preset threshold. At this time, the moisture sensor 500 may use sensors such as capacitive sensors and resistive sensors.

[0070] In addition, the moisture sensor 500 can perform early warning reminders on its own, for example, directly connecting to the background of the mobile terminal and the power-consuming device using the battery pack, and directly sending an early warning reminder to the mobile terminal or the background when the early warning conditions are met.

[0071] The battery pack generally also includes a battery management system, which is used to monitor and manage the status of the battery. The moisture sensor 500 can also be connected to the battery management system. When the moisture sensor 500 detects a water leak, the battery management system can issue an early warning reminder to prompt the user or the backend to check the electrical equipment. If the battery pack insulation failure or leakage information is received, it can be determined that the first pressure release device 110 has failed to seal and water has entered.

[0072] The number of moisture sensors 500 to be set can be determined according to actual conditions. If the moisture sensor 500 determines whether to issue an early warning by detecting the water content of the filling member 400, then when the filling member 400 completely covers the bottom of the exhaust passage 200, a moisture sensor 500 can be set at a certain distance for detection. If the filling member 400 is only set locally, it is advisable to set at least one moisture sensor 500 at each location where the filling member 400 is set, so as to issue an early warning in time when the amount of water inflow is large, so as to avoid damage to the battery 300 due to excessive water inflow.

[0073] Of course, if the moisture sensor 500 directly determines whether to issue an early warning reminder based on the amount of water accumulated at the bottom of the exhaust passage 200 , the moisture sensor 500 can be set at any position at the bottom of the exhaust passage 200 .

[0074] During the use of the battery pack, if only a small amount of water accidentally enters the exhaust channel 200 through the first pressure release device 110, it will be directly absorbed by the filler 400. When the water adsorbed in the filler 400 does not reach the preset threshold, or the water is absorbed by the filler 400 and there is no water accumulation at the bottom of the exhaust channel 200, the moisture sensor 500 will not issue an early warning, thereby avoiding false alarms. When the first pressure release device 110 fails for a long time or the seal fails due to aging fatigue, more water will enter. At this time, the moisture sensor 500 can quickly detect it and issue an early warning, so that the user can deal with it in time to prevent irreversible accidents.

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

[0076] When water enters the exhaust channel 200 through the first pressure release device 110 , it can be better absorbed by the filling member 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 guide valve 600, which is arranged in the exhaust channel 200. The 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 release device 110 to quickly discharge the gas.

[0078] Specifically, the structure inside the exhaust channel 200 can be designed to form a diverter valve 600 that helps to increase the speed or pressure of the gas reaching the first pressure release device 110. Of course, the diverter valve 600 can also be an additional structure added inside the exhaust channel 200, and this embodiment is not limited thereto.

[0079] Exemplarily, the exhaust passage 200 includes a first side wall 210 and a second side wall 220 that are oppositely disposed, and the first pressure release device 110 is disposed on the first side wall 210 .

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

[0081] Among them, one or more first guide plates 610 can be set. When multiple first guide plates 610 are set, they can be arranged in sequence along the height of the second side wall 220. Of course, the angles between different first guide plates 610 and the second side wall 220 can be the same or different, as long as adjacent first guide plates 610 do not cross each other. This embodiment does not limit it here.

[0082] In addition, in order to improve the waterproof effect of the battery pack, the end of the first guide plate 610 adjacent to the filling piece 400 can be extended to between the top of the first port 111 and the filling piece 400, and the side of the first guide plate 610 away from the second side wall 220 extends toward the first side wall 210, and a triangle-like structure is formed between it and the filling piece 400 and the second side wall 220, so that the first guide plate 610 has a certain water-blocking effect, and when a small amount of water enters, it prevents the water from contacting the battery 300 upward.

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

[0084] The first guide plate 610 and the second guide plate 620 both extend in the direction of the gas discharged from the battery 300 toward the first pressure release device 110, so that the first pressure release device 110 can be activated as soon as possible to release the pressure. At the same time, the second guide plate 620 cooperates with the first guide plate 610, and the sides of the second guide plate 620 and the first guide plate 610 facing the bottom of the exhaust channel 200 can block the water, so as to prevent the water from splashing upward and affecting the battery 300.

[0085] It is understandable that one or more second guide plates 620 may be provided, and the angles between different second guide plates 620 and the first side wall 210 may be the same or different, which is not limited in this embodiment.

[0086] The second guide plate 620 adjacent to the first port 111 is located above the first port 111 so as not to affect the flow of gas into and out of the first pressure release device 110 .

[0087] In some embodiments, a plurality of first guide plates 610 and second guide plates 620 are provided, and the first guide plates 610 and second guide plates 620 are alternately arranged in sequence along the height direction of the housing 100. Thus, the gas discharged from the battery 300 is accelerated through the exhaust channel 200 by the first guide plates 610 and the second guide plates 620, and the first pressure release device 110 is activated more quickly to release pressure quickly.

[0088] Among them, when multiple first guide plates 610 and multiple second guide plates 620 are set, the second guide plates 620 have a plurality of different inclination angles, that is, the angle between the second guide plates 620 and the first side wall 210 has a plurality of different values, and the first guide plates 610 also have a plurality of different inclination angles, that is, the angle between the first guide plates 610 and the second side wall 220 also has a plurality of different values, thereby further accelerating the gas discharge.

[0089] When the first pressure release device 110 fails for a long time or the seal fails due to aging fatigue, if the battery pack is wading or the electrical equipment is used in rainy days, the external water enters the battery pack through the first pressure release device 110. At this time, the first guide plate 610 and the second guide plate 620 will have a deceleration reverse effect on the incoming water, preventing the water from splashing upward or moving quickly, and guiding the water downward into the lower area of ​​the exhaust channel 200 where the filling piece 400 is located. At this time, the filling piece 400 will absorb part of the water, and the excess water will overflow to other positions at the bottom of the exhaust channel 200 and contact the moisture sensor 500. At this time, the moisture sensor 500 will issue an early warning reminder to inform the user or the background that the battery pack needs to be inspected and verified as soon as possible to prevent irreversible major accidents.

[0090] In some embodiments, see Figure 1 , Figure 2 and Figure 5 As shown, the battery pack also includes at least one airway baffle 700, which is located between the battery 300 and the side wall of the outer shell 100 to form an exhaust channel 200 between the outer shell 100 and the airway baffle 700, and a first through hole 710 is provided on the airway baffle 700 to introduce the gas discharged from the battery 300 into the exhaust channel 200 through the first through hole 710.

[0091] Specifically, a plurality of mounting parts are provided on the bottom plate 130 in the housing 100, each mounting part can fix a battery 300, and the plurality of batteries 300 are connected by a connecting piece 320, and the connecting piece 320 can achieve the required pressure and capacitance by connecting the plurality of batteries 300 in series or in parallel. When connected in series, the connecting piece 320 connects the positive poles of the plurality of batteries 300 to the negative pole of the last battery 300, and finally forms a battery pack with a higher voltage. In this case, the connecting piece 320 needs to connect the positive pole of the last battery 300 to the total positive pole 340 of the battery pack, and the negative pole of the first battery 300 to the total negative pole 330 of the battery pack. When connected in parallel, the connecting piece 320 connects the positive poles of the plurality of batteries 300 together, and the negative poles are also connected together to increase the capacity of the battery pack. In this case, the connecting piece 320 needs to connect the positive poles of all batteries 300 to the total positive pole 340 of the battery pack, and the negative poles of all batteries 300 to the total negative pole 330 of the battery pack.

[0092] An airway baffle 700 may be disposed between the mounting portion at the edge and the first frame 131 and the second frame 121. The airway baffle 700 may be directly connected to the bottom plate 130, the upper cover 120, the first frame 131 and the second frame 121, and isolate an exhaust passage 200 in the mounting cavity that is separated from the area where the battery 300 is mounted. Of course, the airway baffle 700 may also be connected only to the first frame 131 and the second frame 121, and isolate an exhaust passage 200 that is slightly lower than the height of the mounting cavity.

[0093] It is understandable that the second pressure release device 310 on the battery 300 is generally arranged at the end of the battery 300 where the pole is arranged, and when the battery 300 is installed in the installation cavity, the pole is generally facing the side wall of the shell 100, and when the battery 300 is installed, the positive pole and the negative pole of the battery 300 may need to face different directions, so the second pressure release device 310 may exist on both sides of the battery 300 with poles. Regardless of whether there are second pressure release devices 310 on both sides or only on one side, for the side where the second pressure release device 310 is arranged, it is necessary to arrange an exhaust channel 200 between the side wall of the shell 100 and the battery 300, and such an arrangement also allows the gas discharged through the second pressure release device 310 on the battery 300 to be discharged directly from the exhaust channel 200 located outside the battery 300, shortening the distance of gas flow and accelerating gas discharge.

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

[0095] Specifically, an airway baffle 700 needs to be set at least on one side of the battery 300 where the second pressure release device 310 is set. The first through hole 710 on the airway baffle 700 directly corresponds to and is connected to the exhaust port of each second pressure release device 310. Of course, the airway baffle 700 at other positions does not need to be set with the first through hole 710, so that when a battery 300 discharges high-temperature and high-pressure gas through the second pressure release device 310, the high-temperature and high-pressure gas can directly enter the exhaust channel 200 through the first through hole 710, thereby reducing its impact on the adjacent battery 300.

[0096] At the same time, the exhaust pressure of the second pressure release device 310 is greater than the exhaust pressure of the first pressure release device 110. When the high-temperature and high-pressure gas passes through the exhaust channel 200, the second pressure release devices 310 of other batteries 300 will not be opened. The high-temperature and high-pressure gas will be directly discharged out of the battery pack through the first pressure release device 110, which can further reduce the impact on the surrounding batteries 300.

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

[0098] Of course, see Figure 1As shown, the airway baffle 700 may also directly cooperate with the housing 100 to form an exhaust channel 200 arranged around the outside of the battery 300. In this case, at least one first pressure release device 110 is provided on each of the two opposite sides of the housing 100.

[0099] Of course, the first pressure release device 110 may also be provided on each side wall of the housing 100 , which is not limited in this embodiment.

[0100] Exemplarily, two first pressure release devices 110 may be provided on two opposite side walls of the outer shell 100, respectively. These two side walls are adjacent to the side walls of the outer shell 100 corresponding to the second pressure release devices 310, so that the gas discharged from the battery 300 through the second pressure release device 310 can be temporarily stored and guided by the exhaust channel 200 arranged around the outside of all batteries 300, and then the pressure is released together through multiple first pressure release devices 110, which can effectively increase 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 the present application, an electrical device is further provided, which includes the battery pack in the above embodiments. The battery pack is mainly used to power the electrical device. The electrical device may be an electric vehicle, a hybrid vehicle, an energy storage system, a consumer electronic product, a medical device, an unmanned aerial vehicle, an electric tool, a backup power supply system, or other equipment that requires electricity, which is not limited in the present embodiment.

[0102] Finally, it should be noted that those skilled in the art will easily think of other embodiments of the present application after considering the specification and practicing the application content disclosed herein. The present application is intended to cover any modification, use or adaptation of the present application, which follows the general principles of the present application and includes common knowledge or customary technical means in the art that are not disclosed in the present application, is not limited to the precise structure described above and shown in the drawings, and can be modified and changed in various ways without departing from the scope thereof. The scope of the present application is limited only by the appended claims.

Claims

1. A battery pack, comprising a housing (100) and a battery (300) located in the housing (100), wherein an exhaust passage (200) is provided between the battery (300) and the housing (100), and the housing (100) is provided with a first pressure release device (110) connected to the exhaust passage (200), characterized in that: It also includes a filling piece (400), wherein the filling piece (400) is located in the exhaust passage (200), and the filling piece (400) can absorb moisture.

2. The battery pack according to claim 1, characterized in that: The first pressure release device (110) has a first port (111) connected to the side wall of the exhaust channel (200), the filling piece (400) at least partially covers the first port (111), and the filling piece (400) is a porous structure so that the first port (111) and the exhaust channel (200) are connected through the holes on the filling piece (400).

3. The battery pack according to claim 2, characterized in that: A projection of the first port (111) toward the filling piece (400) is located inside the filling piece (400).

4. The battery pack according to claim 1, characterized in that: The filling piece (400) is foamed silica gel, foam cotton or a porous fiber piece.

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

6. The battery pack according to claim 5, characterized in that: A battery management system is also included, the moisture sensor (500) is communicatively connected to the battery management system, and the battery management system is configured to issue the warning reminder when the amount of water at the bottom of the exhaust channel (200) is greater than a preset threshold.

7. The battery pack according to claim 1, characterized in that: It also includes a guide valve (600), which is arranged in the exhaust channel (200) and is used to guide the gas in the exhaust channel (200) to flow toward the first port (111).

8. The battery pack according to claim 7, characterized in that: The exhaust passage (200) comprises a first side wall (210) and a second side wall (220) which are arranged opposite to each other, and the first pressure release device (110) is arranged on the first side wall (210); The guide valve (600) comprises at least one first guide plate (610), one end of the first guide plate (610) is connected to the second side wall (220), and the other end extends from the top of the shell (100) toward the bottom of the shell (100), and the angle between the first guide plate (610) and the second side wall (220) is less than 90°.

9. The battery pack according to claim 8, characterized in that: One end of the filling piece (400) facing away from the first port (111) extends toward the bottom of the exhaust channel (200), and an end of the first guide plate (610) adjacent to the filling piece (400) extends to between the top of the first port (111) and the filling piece (400).

10. The battery pack according to claim 8, characterized in that: The guide valve (600) further comprises at least one second guide plate (620), one end of the second guide plate (620) being connected to the first side wall (210), and the other end of the second guide plate (620) extending from the top of the shell (100) toward the bottom of the shell (100), the angle between the second guide plate (620) and the first side wall (210) being less than 90°, and a gas flow path for gas to pass through is formed between the first guide plate (610) and the second guide plate (620).

11. The battery pack according to claim 10, characterized in that: The second guide plate (620) adjacent to the first port (111) is located above the first port (111).

12. The battery pack according to claim 10, characterized in that: A plurality of the first guide plates (610) and the second guide plates (620) are provided, and the first guide plates (610) and the second guide plates (620) are alternately arranged in sequence along the height direction of the housing (100).

13. The battery pack according to any one of claims 1 to 12, characterized in that: The invention also includes at least one airway baffle (700), wherein the airway baffle (700) is located between the battery (300) and the housing (100) so as to form the exhaust channel (200) between the housing (100) and the airway baffle (700), and the airway baffle (700) is provided with a first through hole (710) so as to introduce the gas discharged from the battery (300) into the exhaust channel (200) through the first through hole (710).

14. The battery pack according to claim 13, characterized in that: The battery (300) is provided with a second pressure release device (310), at least one of the airway baffles (700) is located between the second pressure release device (310) and the housing (100), the first through holes (710) on the airway baffle (700) are arranged in a one-to-one correspondence with the second pressure release device (310), and the first through holes (710) are connected to the exhaust port of the second pressure release device (310), and the exhaust pressure of the second pressure release device (310) is greater than the exhaust pressure of the first pressure release device (110).

15. The battery pack according to claim 13, characterized in that: A plurality of the airway baffles (700) are provided, and the plurality of the airway baffles (700) are connected in sequence to cooperate with the housing (100) to form the exhaust channel (200) arranged in a ring outside the battery (300), and at least one of the first pressure release devices (110) is provided on opposite sides of the housing (100).

16. The battery pack according to any one of claims 1 to 12, characterized in that: The housing (100) comprises a bottom plate (130) and an upper cover (120), wherein the bottom plate (130) is surrounded by a first frame (131), and the upper cover (120) is surrounded by a second frame (121), wherein the first frame (131) and the second frame (121) are connected to form an installation cavity between the bottom plate (130) and the upper cover (120), wherein the battery (300) and the exhaust passage (200) are both located in the installation cavity, and the first pressure release device (110) is arranged on the first frame (131).

17. An electrical equipment, characterized in that: Comprising a battery pack as described in any one of claims 1-16.

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