Battery pack and energy storage equipment

Abstract

The utility model discloses a battery pack and energy storage equipment, and belongs to the technical field of batteries. The plurality of single batteries are arranged on the bearing part, and each single battery is provided with a pressure release valve; the explosion venting piece is arranged on the bearing piece, an exhaust channel and a fire-fighting gas channel which are communicated with each other are arranged in the explosion venting piece, a plurality of gas inlets are formed in the explosion venting piece towards the battery monomers, the gas inlets are communicated with the exhaust channel, and the gas inlets and the pressure relief valves are correspondingly arranged; and under the condition that the pressure in the single battery body exceeds a threshold value, the pressure release valve is opened so as to release pressure and exhaust gas towards the exhaust channel. High-temperature and high-pressure gas can be guided to be discharged out of the battery pack in time when the single batteries in the battery pack are in thermal runaway, meanwhile, the thermal runaway batteries and the generated high-temperature and high-pressure gas are extinguished and cooled, and the safety performance of the battery pack is improved.

Description

Technical Field

[0001] This application belongs to the technical field of batteries, and particularly relates to a battery pack and an energy storage device. Background Art

[0002] With the increasing scale of the energy storage market, the safety performance requirements for energy storage systems are becoming increasingly strict. Currently, there is a lack of fire protection configuration in the battery packs of energy storage systems. When a battery in the battery pack undergoes thermal runaway, the high-temperature and high-pressure gas is likely to cause damage to other batteries in the battery pack or even the entire energy storage system. Summary of the Utility Model

[0003] An embodiment of this application provides a battery pack, aiming to overcome the above technical problems; another object of an embodiment of this application is to provide an energy storage device.

[0004] The battery pack described in an embodiment of this application includes:

[0005] A carrier;

[0006] A plurality of battery cells, the plurality of battery cells are arranged on the carrier, and the battery cells have pressure relief valves;

[0007] An explosion venting member, the explosion venting member is arranged on the carrier, and an exhaust passage and a fire extinguishing gas passage that are communicated with each other are arranged in the explosion venting member. The explosion venting member is provided with a plurality of air inlets facing the battery cells, the air inlets are communicated with the exhaust passage, and the air inlets and the pressure relief valves are arranged corresponding to each other;

[0008] Wherein, when the pressure in the battery cell exceeds a threshold value, the pressure relief valve opens to release pressure and exhaust gas into the exhaust passage.

[0009] In some embodiments, the plurality of battery cells form a first battery group and a second battery group, and the explosion venting member is arranged between the first battery group and the second battery group;

[0010] The explosion venting member has a first surface and a second surface arranged opposite to each other. The plurality of air inlets include a first air inlet arranged on the first surface and a second air inlet arranged on the second surface. The first air inlet and the pressure relief valve of the first battery group are arranged corresponding to each other, and the second air inlet and the pressure relief valve of the second battery group are arranged corresponding to each other.

[0011] In some embodiments, the explosion-proof component includes a main body and a partition connected to the main body, the exhaust channel and the fire gas channel are respectively arranged in the main body, the partition is arranged in the main body, and the partition separates the exhaust channel and forms a first channel and a second channel, the first channel and the second channel are respectively connected to the fire gas channel, the first air inlet is connected to the first channel, and the second air inlet is connected to the second channel.

[0012] In some embodiments, the explosion relief member has a first end and a second end that are oppositely disposed in its own extension direction;

[0013] The explosion relief component is further provided with a fire gas inlet and an exhaust port, wherein the fire gas inlet is connected to the fire gas passage, and the exhaust port is connected to the exhaust passage. The fire gas inlet is arranged at the first end, and the exhaust port is arranged at the second end.

[0014] In some embodiments, the battery pack further comprises:

[0015] A gas sensing component is provided on the explosion relief component and is used to sense the gas discharged by the pressure relief valve.

[0016] In some embodiments, a plurality of the gas sensing elements are provided, and each of the gas sensing elements is correspondingly provided at each of the first air inlets.

[0017] In some embodiments, the battery cell includes a shell, the shell has a third surface facing the explosion relief component, the pressure relief valve is provided on the third surface, and the third surface is in contact with the explosion relief component.

[0018] In some embodiments, the pressure relief valve is located within an orthographic projection of the air inlet on the third surface.

[0019] In some embodiments, the battery pack further comprises:

[0020] A liquid cooling component is provided on the carrier, and the liquid cooling component has a heat exchange surface, and the battery cells and the explosion relief component are respectively provided on the heat exchange surface.

[0021] In some embodiments, the battery pack further comprises:

[0022] A crossbeam is provided on the bearing component, and an extension direction of the crossbeam intersects with an extension direction of the explosion relief component.

[0023] In some embodiments, a plurality of cross beams are provided, and the plurality of cross beams are arranged at intervals. The battery cells are arranged between adjacent cross beams, and the explosion relief component is connected to at least a portion of the cross beams.

[0024] Correspondingly, an energy storage device provided by an embodiment of the present application includes the above battery pack.

[0025] The battery pack of the embodiment of the present application includes a carrier, a plurality of battery cells, and an explosion venting member. The plurality of battery cells are arranged on the carrier, and the battery cells have pressure relief valves. The explosion venting member is arranged on the carrier. An exhaust passage and a fire extinguishing gas passage that communicate with each other are provided in the explosion venting member. The explosion venting member is provided with a plurality of air inlets facing the battery cells. The air inlets communicate with the exhaust passage, and the air inlets and the pressure relief valves are arranged corresponding to each other. When the pressure in the battery cell exceeds a threshold value, the pressure relief valve opens to release pressure and exhaust gas into the exhaust passage. When a thermal runaway occurs in the battery cells in the accommodation cavity, the pressure relief valve communicates with the air inlet and discharges high-temperature and high-pressure gas into the exhaust passage. The exhaust passage is conducive to centrally guiding the high-temperature and high-pressure gas out of the battery pack. Fire extinguishing gas is input into the exhaust passage through the fire extinguishing gas passage, so that the fire extinguishing gas mixes with the high-temperature and high-pressure gas discharged from the pressure relief valve in the exhaust passage, thereby achieving the effect of extinguishing fire and reducing temperature. At the same time, continuously introducing the fire extinguishing gas can reach the battery cell with thermal runaway, thereby extinguishing fire and reducing temperature for the battery cell with thermal runaway, which is beneficial to reducing the risk that the high-temperature and high-pressure gas ejected by the battery cell with thermal runaway damages other battery cells and improving the safety performance of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present application. For those skilled in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0027] Figure 1 It is a schematic structural diagram of the battery pack provided by the embodiment of the present application;

[0028] Figure 2 It is a schematic structural diagram of the battery cell detaching from the explosion venting member provided by the embodiment of the present application;

[0029] Figure 3 It is a schematic structural diagram of the carrier, the liquid cooling member, the explosion venting plate and the cross beam provided by the embodiment of the present application;

[0030] Figure 4 It is a partial schematic structural diagram of the pressure relief valve, the exhaust passage and the fire extinguishing gas passage provided by the embodiment of the present application;

[0031] Figure 5 It is a schematic structural diagram of the exhaust port provided by the embodiment of the present application;

[0032] Figure 6 It is a schematic diagram of the gas flow of the exhaust passage and the fire extinguishing gas passage provided by the embodiment of the present application;

[0033] Figure 7 The structural schematic diagram of the explosion venting component provided by the embodiment of the present application;

[0034] Figure 8 is Figure 7 the enlarged view of part A in

[0035] Reference numerals: 1, carrier; 11, bottom plate; 12, frame; 2, battery cell; 20, housing; 200, third surface; 201, fourth surface; 21, pressure relief valve; 22, terminal; 23, first battery pack; 24, second battery pack; 3, explosion venting component; 30, exhaust passage; 300, first passage; 301, second passage; 31, fire gas passage; 32, air inlet; 320, first air inlet; 321, second air inlet; 33, body; 330, first surface; 331, second surface; 332, first end; 333, second end; 34, partition; 35, fire gas inlet; 36, exhaust port; 360, first exhaust port; 361, second exhaust port; 4, gas sensing component; 5, liquid cooling component; 50, heat exchange surface; 6, cross beam; X, first direction; Y, second direction; Z, third direction. Detailed implementation manners

[0036] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts fall within the protection scope of the present application.

[0037] In the description of the present application, it should be understood that the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more features. In the description of the present application, "a plurality of" means two or more, and at least one means one, two or more, unless otherwise specifically defined.

[0038] Currently, the battery pack of the energy storage system does not take the fire protection configuration as a standard configuration. When a battery in the battery pack undergoes a thermal runaway, most rely on the pressure relief structure of the battery pack to discharge the ejected high-temperature and high-pressure gas. This part of the high-temperature and high-pressure gas itself contains combustible gas and can burn violently at high temperatures. Therefore, the high-temperature and high-pressure gas is likely to damage other batteries in the battery pack or even the entire energy storage system.

[0039] In view of this, with reference to Figures 1 to 8, embodiments of the present application provide a battery pack to overcome at least one of the above technical problems.

[0040] It should be noted that in the following embodiments, a first direction X, a second direction Y, and a third direction Z that intersect pairwise are introduced. Among them, the first direction X is substantially parallel to the overall length direction of the battery pack in the embodiments of the present application, the second direction Y is substantially parallel to the overall width direction of the battery pack in the embodiments of the present application, and the third direction Z is substantially parallel to the overall height direction of the battery in the embodiments of the present application.

[0041] Refer to Figure 1 and Figure 2 , a battery pack includes a carrier 1, a plurality of battery cells 2, and an explosion venting member 3.

[0042] Among them, the plurality of battery cells 2 and the explosion venting member 3 are both arranged on the carrier 1. The battery cell 2 has a pressure relief valve 21. An exhaust passage 30 and a fire extinguishing gas passage 31 that are connected and communicated are arranged in the explosion venting member 3. The explosion venting member 3 is provided with a plurality of air inlets 32 facing the battery cell 2. The air inlets 32 are communicated with the exhaust passage 30, and the air inlets 32 and the pressure relief valve 21 are arranged in correspondence. When the pressure in the battery cell 2 exceeds the threshold, the pressure relief valve 21 opens to relieve pressure and exhaust gas into the exhaust passage 30, and the fire extinguishing gas passage 31 is used to input fire extinguishing gas into the exhaust passage 30.

[0043] When the battery cell 2 undergoes thermal runaway, the pressure relief valve 21 communicates with the air inlet 32 and discharges high-temperature and high-pressure gas into the exhaust passage 30. The corresponding arrangement of the air inlet 32 and the pressure relief valve 21 enables each battery cell 2 to independently relieve pressure and exhaust gas, reducing the influence between the battery cells 2. The exhaust passage 30 is conducive to centrally guiding the high-temperature and high-pressure gas out of the battery pack. Fire extinguishing gas is input into the exhaust passage 30 through the fire extinguishing gas passage 31, so that the fire extinguishing gas is mixed with the high-temperature and high-pressure gas discharged from the pressure relief valve 21 in the exhaust passage 30, thereby achieving the effect of extinguishing fire and reducing temperature. By continuously introducing fire extinguishing gas, the fire extinguishing gas can reach the battery cell 2 that has undergone thermal runaway through the exhaust passage 30 and the corresponding air inlets 32, thereby extinguishing fire and reducing the temperature of the battery cell 2 that has undergone thermal runaway, which is conducive to reducing the risk that the high-temperature and high-pressure gas ejected by the battery cell 2 that has undergone thermal runaway damages other battery cells 2 and improving the safety performance of the battery pack.

[0044] It should be noted that the pressure relief threshold of the pressure relief valve 21 in the embodiments of the present application can be flexibly adjusted according to the specifications of the battery cell 2, design requirements, etc. The pressure relief principle of the pressure relief valve 21 is to break when the internal pressure of the battery cell 2 reaches the threshold, so that the pressure relief valve 21 communicates the inside of the battery cell 2 and the exhaust passage 30.

[0045] In addition, refer to Figures 1 to 3, for the convenience of showing the internal structure of the battery pack, the carrier 1 shown in the embodiments of the present application only includes a tray structure formed by a bottom plate 11 and two side frames 12. The bottom plate 11 is disposed at the bottom of the overall battery pack in the third direction Z, and the two side frames 12 extend along the first direction X and are spaced apart along the second direction Y. It can be understood that in other embodiments, such as when applied in an energy storage station, since the carrier 1 is built into the energy storage station, the carrier 1 can be used alone without complete encapsulation. When applied in the field of power batteries, the carrier 1 can also be in the form of a box or other encapsulation forms, which will not be elaborated here.

[0046] Specifically, in some embodiments, referring to Figures 1 to 4 , a plurality of battery cells 2 include a first battery group 23 and a second battery group 24 formed by arranging along the first direction X respectively. The first battery group 23 and the second battery group 24 are arranged along the second direction Y, and the explosion venting member 3 is spaced between the first battery group 23 and the second battery group 24. The number of battery cells 2 in the first battery group 23 and the second battery group 24 can be flexibly adjusted according to the battery pack specifications.

[0047] The explosion venting member 3 has a first surface 330 and a second surface 331 arranged oppositely in the second direction Y. The plurality of air inlets 32 include a plurality of first air inlets 320 provided on the first surface 330 and a plurality of second air inlets 321 provided on the second surface 331. The first air inlets 320 and the pressure relief valves 21 of the first battery group 23 are correspondingly arranged, and the second air inlets 321 and the pressure relief valves 21 of the second battery group 24 are correspondingly arranged.

[0048] It can be understood that in other embodiments, the plurality of battery cells 2 may also only include the first battery group 23 and be arranged with the explosion venting member 3 along the second direction Y. At this time, the explosion venting member 3 only needs to be provided with air inlets 32 facing the first battery group 23. The battery cells 2 are arranged on both sides of the explosion venting member 3 in the second direction Y, which can meet the simultaneous pressure relief and exhaust of multiple battery groups without additionally increasing the explosion venting member 3, and is beneficial to increasing the density of the battery pack.

[0049] In some embodiments, referring to Figures 3 to 7 , the explosion venting member 3 includes a main body 33 and a partition portion 34 connecting the main body 33. The exhaust passage 30 and the fire gas passage 31 are respectively arranged in the main body 33. The partition portion 34 is arranged in the main body 33, and the partition portion 34 divides the exhaust passage 30 and forms a first passage 300 and a second passage 301. The first passage 300 and the second passage 301 are respectively communicated with the fire gas passage 31. The first air inlet 320 is communicated with the first passage 300, and the second air inlet 321 is communicated with the second passage 301.

[0050] Specifically, in this embodiment, the exhaust passage 30 and the fire gas passage 31 are distributed along the third direction Z, and the exhaust passage 30 is located on the side of the fire gas passage 31 away from the bottom plate 11. The first passage 300 and the second passage 301 are spaced apart by a partition portion 34 in the second direction Y, that is, the battery cells 2 in the first battery pack 23 and the battery cells 2 in the second battery pack 24 are independent of each other in terms of pressure relief and exhaust, further reducing the impact on other battery cells 2 when a battery cell 2 undergoes thermal runaway, improving the protection of the battery cells 2 and the safety of the battery pack.

[0051] In some embodiments, referring to Figures 4 to 7 , the exhaust passage 30 and the fire gas passage 31 extend along the first direction X respectively, and the explosion venting member 3 has a first end 332 and a second end 333 which are oppositely arranged in the first direction X.

[0052] The explosion venting member 3 is further provided with a fire gas inlet 35 and an exhaust port 36. The fire gas inlet 35 is communicated with the fire gas passage 31, the exhaust port 36 is communicated with the exhaust passage 30, the fire gas inlet 35 is arranged at the first end 332, and the exhaust port 36 is arranged at the second end 333.

[0053] It should be noted that, referring to Figure 4 and Figure 5 , corresponding to the first passage 300 and the second passage 301 in this embodiment, the exhaust port 36 is also spaced apart by the partition portion 34 to form a first exhaust port 360 and a second exhaust port 361, wherein the first exhaust port 360 is communicated with the first passage 300, and the second exhaust port 361 is communicated with the second passage 301.

[0054] Referring to Figure 6 and Figure 7 , after the fire gas is introduced into the fire gas passage 31 from the fire gas inlet 35, it can fully flow through each air inlet 32 along the first direction X, which is beneficial to fully cover the pressure relief valves 21 of each battery cell 2, improve the accuracy of fire extinguishing for each battery cell 2, and in addition, is beneficial to extending the flow path of the fire gas, so as to promote the full mixing of the fire gas with the high-temperature and high-pressure gas ejected by the battery cell 2 in the thermal runaway state, achieving the effects of full fire extinguishing and temperature reduction.

[0055] In some embodiments, referring to Figure 7 and Figure 8 , the battery pack further includes a gas sensing member 4, and the gas sensing member 4 is used to sense the gas discharged from the pressure relief valve 21. The gas sensing member 4 can be arranged inside the explosion venting member 3 or at the air inlet 32.

[0056] It can be understood that the gas sensing member 4 can adopt a device (such as a gas detector, etc.) capable of sensing the gas discharged from the pressure relief valve 21, that is, by detecting whether the gas ejection volume is high or whether the gas ejection volume changes greatly to determine whether the battery is out of control. In some embodiments, the fire extinguishing gas can be provided by a gas storage structure built into the battery pack. An opening and closing valve and a controller are provided for the gas storage structure. The controller can open the opening and closing valve in response to the sensing signal of the gas sensing member 4 and input the fire extinguishing gas into the fire extinguishing gas passage 31 through the fire extinguishing gas inlet 35. The sensing principle of the gas sensing member 4 and the principles of fire extinguishing gas storage and transportation are all prior arts and will not be elaborated here.

[0057] In some embodiments, referring to Figure 7 and Figure 8 , a plurality of gas sensing members 4 are provided, and each gas sensing member 4 is correspondingly arranged at each air inlet 32. By providing a plurality of gas sensing members 4 corresponding to each air inlet 32 and the pressure relief valve 21, it is beneficial to further improve the timeliness of sensing the thermal runaway of each battery cell 2 and the timeliness of controlling the delivery of the fire extinguishing gas, thereby improving the safety of the battery pack.

[0058] In addition, in some embodiments, in addition to using the gas sensing member 4, devices such as a temperature sensor and a pressure sensor can also be used to monitor the temperature, pressure, etc. at the air inlet 32 in real time, that is, by detecting whether the temperature and pressure at the air inlet increase or change rapidly to determine whether the battery is out of control, and it is also possible to monitor whether the pressure relief valve 21 breaks and ejects high-temperature and high-pressure gas.

[0059] In addition, in some embodiments, in addition to being arranged at the air inlet 32, the installation position of the gas sensing member 4 can be flexibly adjusted as needed to meet the requirement of being able to sense the gas ejected by the pressure relief valve 21 in a timely manner.

[0060] In some embodiments, referring to Figure 2 and Figure 4 , the battery cell 2 includes a housing 20, the housing 20 has a third surface 200 facing the explosion venting member 3, the pressure relief valve 21 is arranged on the third surface 200, and the third surface 200 is attached to the explosion venting member 3.

[0061] Specifically, the housing 20 can be hermetically attached to the explosion venting member 3 by means of adhesives, etc., so as to ensure that the pressure relief valve 21 is completely located within the air inlet 32, which is beneficial for the gas to be smoothly introduced into the exhaust passage 30 after the pressure relief valve 21 breaks, and at the same time reduces the leakage of high-temperature and high-pressure gas into the gap between the battery cell 2 and the explosion venting member 3.

[0062] In some embodiments, referring to Figure 2 and Figure 4, the pressure relief valve 21 is located within the orthographic projection of the air inlet 32 on the third surface 200. That is, controlling the opening area of the air inlet 32 to be not less than the flow-through area after the pressure relief valve 21 is opened is beneficial to improving the smoothness of guiding the gas from the air inlet 32 into the exhaust passage 30, and can also enable the ejected gas to enter the exhaust passage 30 more completely.

[0063] At the same time, in some embodiments, referring to Figure 2 and Figure 4 , the housing 20 further has a fourth surface 201 disposed opposite to the third surface 200, and the battery cell 2 further includes a terminal post 22, and the terminal post 22 passes through the fourth surface 201.

[0064] Setting the terminal post 22 and the pressure relief valve 21 on both sides of the housing 20 in the second direction Y is beneficial for installing the electrical connection structure on the side of the terminal post 22 on the one hand, and on the other hand, it also reduces the risk of damage to the electrical connection structure caused by high-temperature and high-pressure gas when the side of the pressure relief valve 21 bursts.

[0065] In some embodiments, referring to Figures 1 to 3 , the battery pack further includes a liquid cooling member 5, and the liquid cooling member 5 is disposed on the carrier 1. In this embodiment, the shown liquid cooling member 5 is disposed above the bottom plate 11, and the liquid cooling member 5 can adopt a liquid cooling plate structure with a liquid cooling flow channel formed inside. The liquid cooling member 5 can be fixed to the bottom plate 11 and the frame 12 by means of riveting, welding, gluing, etc.

[0066] The liquid cooling member 5 has a heat exchange surface 50 facing the battery cell 2 and the explosion venting member 3, and the battery cell 2 and the explosion venting member 3 are respectively connected to the heat exchange surface 50. Specifically, the battery cell 2 and the explosion venting member 3 can also be fixed to the liquid cooling member 5 by means of welding, gluing, etc. The liquid cooling member 5 is used for the battery cell 2 and the explosion venting member 3 to contact and provide heat dissipation, which is beneficial to keeping the battery cell 2 at a better operating temperature and improving the overall safety of the battery pack.

[0067] In addition, in some embodiments, referring to Figures 1 to 3 , the battery pack further includes a plurality of cross beams 6, and the plurality of cross beams 6 are respectively disposed on the carrier 1, and the plurality of cross beams 6 are respectively connected to the heat exchange surface 50. The extending direction of the cross beam 6 intersects with the extending direction of the explosion venting member 3.

[0068] Specifically, the plurality of cross beams 6 can be arranged at intervals along the first direction X, and the cross beam 6 extends along the second direction Y. The battery cell 2 is disposed between adjacent cross beams 6, and the explosion venting member � is connected to at least part of the cross beams 6.

[0069] It can be understood that the plurality of cross beams 6 can be arranged in parallel or non-parallel.

[0070] In this embodiment, since the extending direction of the cross beam 6 intersects with the extending direction of the explosion venting member 3, that is, the cross beam 6 is arranged along the width direction of the carrier 1, the structural strength of the carrier 1 can be increased.

[0071] Specifically, in this embodiment, three sets of cross beams 6 are arranged along the first direction X as an example. Each set of cross beams 6 includes two cross beams 6 arranged on both sides of the explosion venting member 3 in the second direction Y. In other embodiments, the number of cross beams 6 can be flexibly adjusted according to the size of the load-bearing member 1 and the arrangement quantity of the battery cells 2.

[0072] The cross beams 6 can be fixedly welded to the frame 12. At the same time, the explosion venting member 3 can be welded to connect the three sets of cross beams 6. The cross beams 6 and the explosion venting member 3 form a support structure on the load-bearing member 1, and at the same time, form an interval limit for the battery cells 2 arranged in groups, improving the stability of the battery cells 2 arranged on the heat exchange surface 50 and the structural strength of the load-bearing member 1.

[0073] Correspondingly, an embodiment of the present application provides an energy storage device, which includes the above-mentioned battery pack. It can be understood that this energy storage device can have all the technical features and corresponding beneficial effects of the above-mentioned battery pack, and will not be elaborated here.

[0074] It should be noted that in some embodiments, the energy storage device may further include an external box, and the external box can adopt a structure such as a container. The battery packs can be set in corresponding quantities according to the energy storage requirements of the energy storage device and stacked and arranged in the external box.

[0075] In addition, for the convenience of operations such as maintenance, an openable box door is usually required to be provided on one side of the external box. Correspondingly, the exhaust port 36 of the explosion venting member 3 and the pressure relief and exhaust structure provided on the battery pack are arranged on the side facing away from the box door to improve the protection of maintenance workers.

[0076] The above has introduced in detail a battery pack and an energy storage device provided by the embodiments of the present application, and specific examples have been used to elaborate the principle and implementation manner of the present application. The description of the above embodiments is only used to help understand the technical solution and its core idea of the present application; those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery pack, characterized in that, Comprising: A carrier (1); A plurality of battery cells (2), the plurality of battery cells (2) being provided on the carrier (1), and the battery cells (2) having pressure relief valves (21); An explosion venting member (3), the explosion venting member (3) being provided on the carrier (1), an exhaust passage (30) and a fire gas passage (31) being provided and communicating with each other in the explosion venting member (3), the explosion venting member (3) being provided with a plurality of air inlets (32) facing the battery cells (2), the air inlets (32) communicating with the exhaust passage (30), and the air inlets (32) and the pressure relief valves (21) being correspondingly arranged; Wherein, when the pressure inside the battery cell (2) exceeds a threshold value, the pressure relief valve (21) opens to relieve pressure and exhaust gas into the exhaust passage (30).

2. The battery pack according to claim 1, characterized in that The plurality of battery cells (2) form a first battery group (23) and a second battery group (24), and the explosion venting member (3) is arranged between the first battery group (23) and the second battery group (24); The explosion venting member (3) has a first surface (330) and a second surface (331) arranged opposite to each other, the plurality of air inlets (32) including a first air inlet (320) provided on the first surface (330) and a second air inlet (321) provided on the second surface (331), the first air inlet (320) and the pressure relief valve (21) of the first battery group (23) being correspondingly arranged, and the second air inlet (321) and the pressure relief valve (21) of the second battery group (24) being correspondingly arranged.

3. The battery pack according to claim 2, characterized in that The explosion venting member (3) includes a body (33) and a partition portion (34) connecting the body (33), the exhaust passage (30) and the fire gas passage (31) being respectively provided in the body (33), the partition portion (34) being provided in the body (33), and the partition portion (34) partitioning the exhaust passage (30) to form a first passage (300) and a second passage (301), the first passage (300) and the second passage (301) respectively communicating with the fire gas passage (31), the first air inlet (320) communicating with the first passage (300), and the second air inlet (321) communicating with the second passage (301).

4. The battery pack according to claim 2, characterized in that The explosion venting member (3) has a first end (332) and a second end (333) arranged opposite to each other in its own extending direction; The explosion venting member (3) is further provided with a fire gas inlet (35) and an exhaust port (36), the fire gas inlet (35) communicating with the fire gas passage (31), the exhaust port (36) communicating with the exhaust passage (30), the fire gas inlet (35) being provided at the first end (332), and the exhaust port (36) being provided at the second end (333).

5. The battery pack according to claim 1, characterized in that, The battery pack further includes: A gas sensor (4), the gas sensor (4) is disposed on the explosion relief member (3), and the gas sensor (4) is used to sense the gas discharged from the pressure relief valve (21).

6. The battery pack according to claim 5, wherein A plurality of the gas sensors (4) are provided, and each of the gas sensors (4) is correspondingly disposed at each of the air inlets (32).

7. The battery pack according to claim 1, wherein The battery cell (2) includes a housing (20), the housing (20) has a third surface (200) facing the explosion relief member (3), the pressure relief valve (21) is disposed on the third surface (200), and the third surface (200) is attached to the explosion relief member (3).

8. The battery pack according to claim 7, wherein The pressure relief valve (21) is located within the orthographic projection of the air inlet (32) on the third surface (200).

9. The battery pack according to claim 1, wherein, The battery pack further includes: A liquid cooling member (5), the liquid cooling member (5) is disposed on the carrier (1), the liquid cooling member (5) has a heat exchange surface (50), and the battery cell (2) and the explosion relief member (3) are both disposed on the heat exchange surface (50).

10. The battery pack according to claim 1, characterized in that, The battery pack further includes: A cross beam (6), the cross beam (6) is disposed on the carrier (1), and the extending direction of the cross beam (6) intersects with the extending direction of the explosion relief member (3).

11. The battery pack according to claim 10, wherein A plurality of the cross beams (6) are provided, the plurality of cross beams (6) are spaced apart, the battery cell (2) is disposed between adjacent cross beams (6), and the explosion relief member (3) is connected to at least a part of the cross beams (6).

12. An energy storage device, characterized in that, Including the battery pack according to any one of claims 1 to 11.

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