Battery pack and energy storage device

Abstract

The invention provides a battery pack and energy storage equipment. The battery pack comprises a shell, a battery cell assembly and a cover body, the shell comprises a first opening and a containing space, and the battery cell assembly is arranged in the containing space and comprises a plurality of battery cells. The cover body is arranged outside the shell, the cover body and the shell are connected to form an electrical bin, the first opening is communicated with the accommodating space and the electrical bin, the fire-fighting assembly comprises a fire-fighting piece and a detection piece, the fire-fighting piece is arranged in the accommodating space, the detection piece is connected with the fire-fighting piece, the fire-fighting piece stores a fire-fighting medium, and a part of the detection piece penetrates out of the first opening and is located in the electrical bin.

Description

Technical Field

[0001] This application relates to the field of batteries, and in particular to a battery pack and an energy storage device. Background Technology

[0002] A battery pack is a device that can continue to be used after the battery cells have been discharged, by recharging to reactivate the active materials. Battery packs are widely used in energy storage devices, such as mobile phones, laptops, power tools, and vehicles. Ensuring the safety of battery packs is one of the key research directions in battery technology development. Summary of the Invention

[0003] In view of the above problems, this application provides a battery pack and an energy storage device, which helps to improve the safety of the battery pack.

[0004] This application provides a battery pack including a casing, a cell assembly, and a cover. The casing includes a first opening and a receiving space, and the cell assembly is disposed within the receiving space, comprising multiple cells. The cover is disposed on the outside of the casing, connected to the casing to form an electrical compartment. The first opening connects the receiving space and the electrical compartment. A fire suppression assembly includes a fire suppression component and a detection component. The fire suppression component is disposed within the receiving space, and the detection component is connected to the fire suppression component. The fire suppression component stores a fire suppression medium, and a portion of the detection component extends through the first opening and is located within the electrical compartment.

[0005] The battery pack in this embodiment is equipped with a fire suppression system. A detector is used to detect whether a cell has experienced thermal runaway. When a cell experiences thermal runaway, the high-temperature material emitted by the cell can trigger the detector. The detector then triggers a fire suppression system, causing it to simultaneously release a fire suppression medium into the containment space and the electrical compartment. The fire suppression medium simultaneously dilutes the oxygen concentration in both the containment space and the electrical compartment, reducing their oxygen content. Because the high-temperature material generated by the thermally runaway cell is in a relatively oxygen-deficient environment, this helps reduce the possibility of open flames and the spread of thermal runaway. Simultaneously, the fire suppression medium is used to extinguish and cool the thermally runaway cell, improving the safety of the battery pack.

[0006] The electrical compartment contains electronic components. In the event of thermal runaway, high-temperature substances entering the electrical compartment through the first opening may further ignite some of the electronic components, thereby igniting the gases generated by the thermal runaway. A fire suppression system releases a fire extinguishing agent into the containment space, which then enters the electrical compartment through the first opening, extinguishing the fire and reducing the risk of battery pack malfunction.

[0007] In one or more of the above optional embodiments, the housing includes a first sidewall and a second sidewall spaced apart along a first direction, the second sidewall having a first opening, and the battery cell assembly, fire-fighting component, and second sidewall arranged sequentially along the first direction.

[0008] The arrangement of the first opening on the second side wall and the arrangement of the fire-fighting components with the second side wall results in a relatively short distance between the release part of the fire-fighting component and the first opening. This allows the fire-fighting medium discharged from the release part to enter the electrical compartment relatively quickly through the first opening, which is beneficial to improving the response capability of the fire-fighting components.

[0009] In one or more of the above optional embodiments, the housing includes a third sidewall and a fourth sidewall spaced apart along a second direction, the first direction being perpendicular to the second direction, a first gap being formed between the battery cell assembly and the third sidewall, a first opening facing the first gap and communicating with the first gap, the fire-fighting component including a receiving portion and a releasing portion, the receiving portion storing the fire-fighting medium, the releasing portion facing the first gap, and a portion of the detector being located within the first gap.

[0010] When the fire-fighting medium is discharged from the release section, the first gap provides a larger release space for the fire-fighting medium, reducing the discharge resistance and enabling rapid release, thus improving the response capability of the fire-fighting components. Simultaneously, the relatively larger amount of fire-fighting medium released into the first gap increases the amount of fire-fighting medium entering the electrical compartment, allowing it to fill the compartment more quickly. The first gap also provides installation space for detectors, which can be reused, reducing the difficulty of detector placement and improving the utilization rate of the first gap.

[0011] In one or more of the above optional embodiments, a second gap is formed between the cell assembly and the fourth sidewall, and a portion of the probe is located within the second gap.

[0012] In one or more of the above optional embodiments, the area in the second sidewall other than the first opening is closed. The depressurized gas mainly flows through the electrical compartment through the first opening, which is beneficial for concentrating the depressurized gas into the electrical compartment and for triggering the fire-fighting device more quickly within the electrical compartment.

[0013] In one or more of the above optional embodiments, each battery cell includes a pressure relief section, and a detection element is provided on the side of the battery cell where the pressure relief section is provided.

[0014] In the event of thermal runaway in a battery cell, the pressure relief section opens to release the internal pressure. High-temperature substances are then expelled from the cell through the open pressure relief section. The detection device can detect the temperature rise relatively quickly and trigger the fire suppression system. This rapid and accurate detection of thermal runaway improves the response capability of the fire suppression system.

[0015] In one or more of the above optional embodiments, the battery cell includes a top seal, the pressure relief section includes the top seal, and the probe is arranged around the outside of the top seal.

[0016] When a battery cell experiences thermal runaway, the top seal partially or entirely ruptures and opens to release the internal pressure of the cell. The detection device quickly and accurately detects thermal runaway, improving the response capability of the fire suppression system.

[0017] In one or more of the above optional embodiments, the battery pack includes a circuit board and a conductive element, the circuit board being disposed within an electrical compartment, the conductive element passing through a first opening, and the conductive element connecting the circuit board and the battery cell assembly.

[0018] The circuit board and the battery cell are located in the electrical compartment and the containment space, respectively. When the battery cell experiences thermal runaway, the high-temperature material discharged from the battery cell has a relatively long path to the circuit board, which helps to prolong the time before the circuit board is damaged by high temperature. This allows the battery management system to control the battery pack to shut down, thus improving the safety of the battery pack.

[0019] The housing separates the circuit board from the fire-fighting components, protecting the circuit board. When the fire-fighting components release the fire-fighting agent, the housing prevents the agent from directly impacting the circuit board, reducing the likelihood of damage. The cover also protects the circuit board, reducing the possibility of damage from collisions or pressure.

[0020] In one or more of the above optional embodiments, the housing includes a first sidewall and a second sidewall spaced apart along a first direction, a third sidewall and a fourth sidewall spaced apart along a second direction, and a top wall and a bottom wall spaced apart along a third direction. The first direction, the second direction, and the third direction are perpendicular to each other. The first sidewall, the second sidewall, the third sidewall, the fourth sidewall, the top wall, and the bottom wall are interconnected to form a receiving space. The second sidewall is provided with a first opening. The first sidewall, the third sidewall, the fourth sidewall, the top wall, and the bottom wall are all closed structures, which helps to improve the dustproof capability of the housing.

[0021] In one or more of the above optional embodiments, a gas passage is formed between the cover and the shell, and the gas passage connects the electrical compartment with the external environment.

[0022] The electrical compartment can exchange gases with the external environment through gas channels, and the heat generated by electronic components can be dissipated to the external environment through gas channels, so that the electronic components are at normal operating temperature.

[0023] In one or more of the above optional embodiments, the battery pack includes a sealing element that blocks a portion of the first opening, and a conductive element and a probe passing through the sealing element.

[0024] The sealing element can prevent external debris from entering the containment space through the electrical compartment and the first opening, thus improving the safety of the battery pack. In the event of thermal runaway of a battery cell, the sealing element can be blasted open or melted to open the first opening, allowing the fire-fighting medium to quickly enter the electrical compartment through the first opening.

[0025] In one or more of the above alternative embodiments, the detector includes a thermal wire.

[0026] In one or more of the above optional embodiments, a portion of the probe is bent and passes through the first opening and enters the electrical compartment, with the bent section formed by the probe located inside the electrical compartment.

[0027] In one or more of the above optional embodiments, no active heat dissipation device is provided on the second sidewall.

[0028] In one or more of the above optional embodiments, the second sidewall is not provided with a cooling fan and a heat dissipation opening that works in conjunction with the cooling fan and connects the housing space and the electrical compartment.

[0029] In one or more of the above optional embodiments, the first sidewall, third sidewall, fourth sidewall, top wall and bottom wall are not provided with active heat dissipation devices.

[0030] In one or more of the above optional embodiments, the first sidewall, third sidewall, fourth sidewall, top wall and bottom wall are not provided with cooling fans and heat dissipation openings that work with cooling fans and connect the housing space and the external space of the battery pack.

[0031] In one or more of the above optional embodiments, the cover is not provided with a cooling fan or a heat dissipation opening for use with the cooling fan.

[0032] In one or more of the above optional embodiments, a gap is formed between the cover and at least one of the third sidewall, top wall, fourth sidewall, and bottom wall, and the gas passage includes the gap.

[0033] This application provides an energy storage device, which includes the battery pack described in the above embodiments. Attached Figure Description

[0034] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings: Figure 1 This is a schematic diagram of the structure of a battery pack provided in one embodiment of this application; Figure 2 This is a partial structural schematic diagram of a battery pack provided in an embodiment of this application; Figure 3 This is an exploded structural diagram of the shell provided in one embodiment of this application; Figure 4This is a partial cross-sectional view of a battery pack provided in an embodiment of this application; Figure 5 yes Figure 4 Enlarged view of section V in the middle; Figure 6 This is a partial structural schematic diagram of a battery pack provided in an embodiment of this application; Figure 7 This is a schematic diagram of the structure of a battery cell provided in one embodiment of this application; Figure 8 This is a partially exploded structural diagram of a battery pack provided in an embodiment of this application; Figure 9 yes Figure 8 Enlarged diagram of point M in the middle.

[0035] Explanation of reference numerals in the attached figures: 10. Battery pack; 20. Shell; 201. First opening; 202. Containment space; 21. First sidewall; 22. Second sidewall; 23. Third sidewall; 24. Fourth side wall; 25. Top wall; 26. Bottom wall; 30. Battery cell assembly; 31. Battery cell; 310. Pressure relief section; 311. Top sealing section; 40. Cover; 50. Electrical Warehouse; 60. Firefighting components; 61. Firefighting parts; 611. Receiving section; 612. Release section; 62. Detection components; 70. First gap; 80. Second gap; 90. Circuit board; 100. Conductive components; 110. Gas passage; X, first direction; Y, the second direction; Z, Third-party orientation. Detailed Implementation

[0036] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0037] It should be noted that, unless otherwise stated, the technical or scientific terms used in the embodiments of this application should have the ordinary meaning understood by those skilled in the art to which the embodiments of this application pertain.

[0038] In the description of the embodiments of this application, the technical terms "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0039] Furthermore, technical terms such as "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. In the description of the embodiments of this application, "a plurality of" means two or more, unless otherwise explicitly defined.

[0040] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0041] See Figures 1 to 5 As shown, this application embodiment provides a battery pack 10, which includes a housing 20 and a cell assembly 30. The housing 20 includes a first opening 201 and a receiving space 202. The cell assembly 30 is disposed within the receiving space 202 and includes a plurality of cells 31. The housing 20 can protect the cell assembly 30.

[0042] The battery pack 10 includes a cover 40, which is disposed on the outside of the housing 20. The cover 40 is connected to the housing 20 to form an electrical compartment 50. A first opening 201 connects the receiving space 202 and the electrical compartment 50. The electrical compartment 50 is used to house electronic components, and the cover 40 can protect the electronic components. The electrical compartment 50 and the receiving space 202 are independently configured spaces.

[0043] In one example, the cover 40 is an insulating structural component. The material of the cover 40 may include, but is not limited to, plastic.

[0044] See the embodiments in this application. Figures 4 to 6As shown, the battery pack 10 includes a fire-fighting component 60, which includes a fire-fighting element 61 and a detector element 62. The fire-fighting element 61 is disposed in the housing space 202, and the detector element 62 is connected to the fire-fighting element 61. The fire-fighting element 61 stores fire-fighting medium (not shown in the figure), and a portion of the detector element 62 extends out of the first opening 201 and is located in the electrical compartment 50.

[0045] Under normal operating conditions, the electrical compartment 50 and the containment space 202 of the battery pack 10 contain oxygen. When the cell 31 experiences thermal runaway, it generates high-temperature substances, such as gases or high-temperature particles. The internal temperature and pressure of the battery pack 10 may continue to rise, potentially leading to structural failure and malfunction of the battery pack 10. The high-temperature substances generated during thermal runaway of the cell 31 can enter the electrical compartment 50 through the first opening 201 to release the internal pressure of the casing 20.

[0046] The detector 62 can detect an increase in temperature. The detector 62 triggers the fire extinguishing device 61. The fire extinguishing device 61 releases the fire extinguishing medium stored inside. Part of the fire extinguishing medium can be released into the containment space 202, and part can be released into the electrical compartment 50 through the first opening 201 to dilute the oxygen concentration in the containment space 202 and the electrical compartment 50.

[0047] In one example, the fire-fighting component 61 contains a liquid fire-fighting medium. After being discharged from the fire-fighting component 61, the fire-fighting medium can be converted into a gaseous fire-fighting medium upon contact with high temperatures, and then released into the containment space 202 and the electrical compartment 50.

[0048] In one example, compressed gaseous fire-fighting medium is provided inside the fire-fighting component 61. After the fire-fighting medium is discharged from the fire-fighting component 61, the gaseous fire-fighting medium is released into the containment space 202 and the electrical compartment 50.

[0049] In one example, the materials used in the fire-fighting medium include, but are not limited to, perfluorohexanone and heptafluoropropane.

[0050] In one example, the detector 62 includes a thermal wire. In the event of thermal runaway of the battery cell 31, the emitted high-temperature substance can trigger the thermal wire. The thermal wire then triggers the fire suppression device 61 to release the fire suppression medium.

[0051] When the battery cell 31 experiences thermal runaway, the high-temperature material generated can enter the electrical compartment 50 through the first opening 201. The detector 62 is partially inserted through the first opening 201 and located inside the electrical compartment 50. This arrangement allows the high-temperature material through the first opening 201 to act on the detector 62 relatively quickly, enabling the detector 62 to quickly detect the thermal runaway of the battery cell 31 and improve the response capability of the fire-fighting assembly 60.

[0052] In one example, when installing the detector 62, a portion of the detector 62 is bent and passed through the first opening 201 and into the electrical compartment 50, with the bent section of the detector 62 located inside the electrical compartment 50.

[0053] In this embodiment of the application, the battery pack 10 is equipped with a fire suppression component 60. A detector 62 is used to detect whether the battery cell 31 has experienced thermal runaway. When the battery cell 31 experiences thermal runaway, the high-temperature material emitted by the battery cell 31 can trigger the detector 62. The detector 62 triggers the fire suppression component 61, causing the fire suppression component 61 to simultaneously release a fire suppression medium into the containment space 202 and the electrical compartment 50. The fire suppression medium simultaneously dilutes the oxygen concentration in the containment space 202 and the electrical compartment 50, reducing the oxygen content in these spaces. Because the high-temperature material generated by the thermally runaway battery cell 31 is in a relatively oxygen-deficient environment, this helps reduce the possibility of ignition of open flames and the spread of thermal runaway. Simultaneously, the fire suppression medium is used to extinguish and cool the thermally runaway battery cell 31, improving the safety of the battery pack 10.

[0054] When the fire-fighting device 61 releases the fire-fighting medium into the containment space 202, the fire-fighting medium compresses the oxygen in the containment space 202 into the electrical compartment 50, which helps to reduce the oxygen concentration in the containment space 202 and reduce the possibility of open flames in the containment space 202.

[0055] Electronic components are housed within the electrical compartment 50. If the battery cell 31 in the containment space 202 experiences thermal runaway, the high-temperature material generated enters the electrical compartment 50 through the first opening 201. This could potentially trigger a fire in some of the electronic components, igniting the gases generated by the thermal runaway. The fire suppression system 61 releases a fire suppression medium into the containment space 202, which then enters the electrical compartment 50 through the first opening 201. The fire suppression medium extinguishes any open flames within the electrical compartment 50, reducing the risk of malfunction in the battery pack 10.

[0056] See the embodiments in this application. Figure 3 and Figure 5 As shown, the housing 20 includes a first sidewall 21 and a second sidewall 22 spaced apart along the first direction X. The second sidewall 22 is provided with a first opening 201. Along the first direction X, the battery cell assembly 30, the fire-fighting component 61, and the second sidewall 22 are arranged in sequence.

[0057] The arrangement of the second sidewall 22 with the first opening 201 and the arrangement of the fire-fighting component 61 with the second sidewall 22 results in a relatively short distance between the release part 612 of the fire-fighting component 61 and the first opening 201. This allows the fire-fighting medium discharged from the release part 612 to enter the electrical compartment 50 relatively quickly through the first opening 201, which is beneficial to improving the response capability of the fire-fighting component 60.

[0058] In one example, electronic components can be mounted and fixed to the second sidewall 22 to reuse the second sidewall 22 and improve its utilization rate.

[0059] In one example, the first sidewall 21 may be a sheet metal part. In one example, the material of the first sidewall 21 includes, but is not limited to, steel, aluminum, or aluminum alloy.

[0060] In one example, the second sidewall 22 can be an insulating structural component. The second sidewall 22 can insulate the cell assembly 30 from the electronic components within the electrical compartment 50, improving the safety of the battery pack 10. In one example, the material of the second sidewall 22 includes, but is not limited to, plastic.

[0061] In one example, the area of ​​the second sidewall 22 other than the first opening 201 is enclosed. Enclosed means that, apart from the first opening 201, the second sidewall 22 does not have any through holes or openings, and these through holes or openings are not blocked, allowing depressurized gas to flow from the containment space 202 into the electrical chamber 50. In this embodiment, the depressurized gas mainly flows into the electrical chamber 50 through the first opening 201, which facilitates the concentration of the depressurized gas into the electrical chamber 50, and facilitates faster triggering of the fire alarm component 61 within the electrical chamber 50.

[0062] In one example, the second sidewall 22 is provided with a fixing hole (not shown in the figure), and a screw is provided in the fixing hole. The fixing hole is sealed by the screw to form a closed structure.

[0063] In one example, the second sidewall 22 is a one-piece structure, such as formed by injection molding or die casting. In other examples, the second sidewall 22 may be formed by splicing different parts. In one example, the second sidewall 22 is not provided with an active heat dissipation device, such as a cooling fan, and the housing 20 is not provided with a separate heat dissipation opening for use with a cooling fan and connecting the housing space 202 and the electrical compartment 50.

[0064] In the embodiments of this application, see Figure 2 and Figure 3 As shown, the housing 20 includes a third sidewall 23 and a fourth sidewall 24 spaced apart along a second direction Y. The first direction X is perpendicular to the second direction Y. A first gap 70 is formed between the battery cell assembly 30 and the fire-fighting component 61 and the third sidewall 23. A portion of the first gap 70 is formed between the battery cell assembly 30 and the third sidewall 23, and a portion of the first gap 70 is formed between the fire-fighting component 61 and the third sidewall 23. A first opening 201 faces the first gap 70 and communicates with the first gap 70.

[0065] See Figure 5 and Figure 6As shown, the fire-fighting component 61 includes a receiving portion 611 and a release portion 612. The receiving portion 611 stores the fire-fighting medium, and the release portion 612 is disposed facing the first gap 70. A portion of the detector 62 is located within the first gap 70. The receiving portion 611 is located between the battery cell assembly 30 and the second sidewall 22. The release portion 612 is configured to release the fire-fighting medium in the receiving portion 611 when the fire-fighting component 61 is triggered.

[0066] The fire-fighting component 61 releases the fire-fighting medium through the release part 612, which facilitates the directional release of the fire-fighting medium. The release part 612 is located inside the housing 20, and the battery cell assembly 30 and the housing 20 do not obstruct the release part 612. The fire-fighting medium discharged from the release part 612 first enters the containment space 202, and then a portion of the fire-fighting medium enters the electrical compartment 50 through the first opening 201. The method of the fire-fighting medium entering the containment space 202 first helps to shorten the path and time of the fire-fighting medium to the thermally runaway battery cell 31. The fire-fighting medium extinguishes the thermally runaway battery cell 31 in the containment space 202, improving the response capability of the fire-fighting component 60.

[0067] When the release section 612 discharges the fire-fighting medium, the first gap 70 provides a larger release space for the fire-fighting medium, reducing the discharge resistance and enabling rapid release of the fire-fighting medium, thus improving the response capability of the fire-fighting component 60. Simultaneously, the relatively large amount of fire-fighting medium released into the first gap 70 increases the amount of fire-fighting medium entering the electrical compartment 50, allowing it to fill the electrical compartment 50 more quickly. The first gap 70 also provides installation space for the detector 62, allowing the detector 62 to reuse the first gap 70, reducing the difficulty of arranging the detector 62 and improving the utilization rate of the first gap 70.

[0068] See one example. Figure 2 and Figure 3 As shown, a second gap 80 is formed between the cell assembly 30 and the fourth sidewall 24, and part of the probe 62 is located within the second gap 80.

[0069] The first gap 70 and the second gap 80 are interconnected. When thermal runaway occurs in the battery cell 31 and the fire-fighting component 61 releases the fire-fighting medium, the fire-fighting medium can be released into the first gap 70 and the second gap 80. The fire-fighting medium can extinguish and cool down the battery cell assembly 30 from both sides, thereby improving the fire-fighting effect of the fire-fighting medium.

[0070] The second gap 80 can provide installation space for the detector 62, and the detector 62 can reuse the second gap 80, reducing the difficulty of arranging the detector 62 and improving the utilization rate of the second gap 80.

[0071] See one example. Figure 6As shown, the detector 62 extends continuously within the electrical compartment 50, the first gap 70, and the second gap 80, and is arranged circumferentially around the battery cell assembly 30. Each battery cell 31 faces the detector 62. When any battery cell 31 experiences thermal runaway, the high-temperature material emitted by that battery cell 31 can trigger the detector 62, thereby improving the response capability of the fire suppression system 60.

[0072] In one example, the battery cell assembly 30 includes four sides. One side is provided with a fire-fighting element 61, and the other three sides are provided with detector elements 62.

[0073] In the embodiments of this application, see Figure 2 and Figure 7 As shown, each battery cell 31 includes a pressure relief section 310. A detection element 62 is provided on the side of the battery cell 31 with the pressure relief section 310. In the event of thermal runaway of the battery cell 31, the pressure relief section 310 of the battery cell 31 opens to release the internal pressure of the battery cell 31. High-temperature substances are discharged from the open position of the pressure relief section 310. The detection element 62 can detect the temperature rise relatively quickly and trigger the fire suppression system 61. The detection element 62 quickly and accurately detects thermal runaway of the battery cell 31, improving the response capability of the fire suppression system 60.

[0074] In the embodiments of this application, see Figure 7 As shown, cell 31 is a pouch cell. Cell 31 includes a top seal 311, and pressure relief part 310 includes the top seal 311. The probe 62 is wrapped around the outside of the top seal 311.

[0075] When thermal runaway occurs in cell 31, the top seal 311 partially or entirely ruptures and opens to release the internal pressure of cell 31. Detector 62 quickly and accurately detects the thermal runaway in cell 31, improving the response capability of the fire suppression system 60.

[0076] In one example, there are no other obstructions between the top cover 311 and the detector 62.

[0077] See one example. Figure 7 As shown, along the second direction Y, the cell 31 includes two opposing top seals 311, and the top seals 311 are provided on both sides of the cell assembly 30. The probe 62 is wrapped around the outside of the top seal 311. In other examples, the cell 31 includes one top seal 311, and the probe 62 is wrapped around the outside of the top seal 311.

[0078] The detector 62 monitors the top seal 311 located on different sides. When thermal runaway occurs in the battery cell 31 and the pressure is released in the top seal 311 on different sides, the detector 62 can detect the thermal runaway relatively quickly, thereby improving the response capability of the fire-fighting assembly 60, shortening the response time of the fire-fighting assembly 60, and improving the fire extinguishing performance.

[0079] In one example, cell 31 is a square-shaped cell, for example... Figure 7 The shown cell is a soft-pack square cell, or a square-shell hard-shell cell. Multiple cells 31 are arranged along a first direction X. The first direction X is the thickness direction of the cell 31, the second direction Y is the length direction of the cell 31, and the third direction Z is the width direction of the cell 31.

[0080] In the embodiments of this application, see Figure 8 and Figure 9 As shown, the battery pack 10 includes a circuit board 90 and a conductive element 100. The circuit board 90 is disposed in the electrical compartment 50, and the conductive element 100 passes through the first opening 201. The conductive element 100 connects the circuit board 90 and the cell assembly 30.

[0081] In one example, a battery management component (not shown) is provided on the circuit board 90. The battery management component can control the battery pack 10 to shut down, thereby reducing the possibility of safety hazards in the battery pack 10 and improving the safety of the battery pack 10.

[0082] In some examples, circuit board 90 may include a printed circuit board (PCB), on which multiple electronic components may be disposed.

[0083] The housing 20 separates the circuit board 90 from the fire extinguishing device 61, and the housing 20 protects the circuit board 90. When the fire extinguishing device 61 releases the fire extinguishing medium, the housing 20 prevents the fire extinguishing medium from directly impacting the circuit board 90, reducing the possibility of damage to the circuit board 90 due to impact. The cover 40 also protects the circuit board 90, reducing the possibility of damage to the circuit board 90 due to collision or compression.

[0084] In one example, the conductive element 100 includes, but is not limited to, a sampling harness, a total positive harness, and a total negative harness.

[0085] See the embodiments in this application. Figure 3 As shown, the housing 20 includes a top wall 25 and a bottom wall 26 spaced apart along a third direction Z. A first side wall 21, a second side wall 22, a third side wall 23, and a fourth side wall 24 are connected to the top wall 25 and the bottom wall 26, respectively. The first side wall 21, the second side wall 22, the third side wall 23, the fourth side wall 24, the top wall 25, and the bottom wall 26 are interconnected to form a receiving space 202. The second side wall 22 has a first opening 201. The first side wall 21, the third side wall 23, the fourth side wall 24, the top wall 25, and the bottom wall 26 are all closed structures, which helps to improve the dustproof capability of the housing 20.

[0086] The first side wall 21, the third side wall 23, the fourth side wall 24, the top wall 25, and the bottom wall 26 are all closed structures, meaning that these structures do not have individual heat dissipation openings, reducing the direct flow of depressurized gas to the outside of the casing 20. The depressurized gas mainly flows through the first opening 201 into the electrical compartment 50, which helps to concentrate the depressurized gas within the electrical compartment 50, facilitating faster triggering of the fire alarm component 61 within the electrical compartment 50.

[0087] In one example, the first sidewall 21 is provided with a fixing hole (not shown in the figure), and a screw is provided in the fixing hole. The fixing hole is sealed by the screw to form a closed structure.

[0088] In one example, the third sidewall 23 is provided with a fixing hole (not shown in the figure), and a screw is provided in the fixing hole. The fixing hole is sealed by the screw to form a closed structure.

[0089] In one example, the fourth sidewall 24 is provided with a fixing hole (not shown in the figure), and a screw is provided in the fixing hole. The fixing hole is sealed by the screw to form a closed structure.

[0090] In one example, the top wall 25 is provided with a fixing hole (not shown in the figure), and the fixing hole is provided with a screw. The fixing hole is sealed by the screw to form a closed structure.

[0091] In one example, the bottom wall 26 is provided with a fixing hole (not shown in the figure), and a screw is provided in the fixing hole. The fixing hole is sealed by the screw to form a closed structure.

[0092] In one example, the first sidewall 21, the third sidewall 23, the fourth sidewall 24, the top wall 25, and the bottom wall 26 are not equipped with active heat dissipation devices, such as cooling fans.

[0093] In one example, the top wall 25, bottom wall 26, third side wall 23 and fourth side wall 24 are connected to the cover 40.

[0094] In one example, the cover 40 does not have a cooling fan or a heat dissipation opening for use with the cooling fan. This improves the protective capability of the cover 40 and prevents external debris from entering the electrical compartment 50 through the heat dissipation opening. At the same time, it facilitates the accumulation of depressurized gas in the electrical compartment 50, thereby triggering the fire alarm 61 more quickly. The heat generated by the battery cell assembly 30 can be dissipated to the external environment through the housing 20.

[0095] In one example, the top wall 25 and the bottom wall 26 may be sheet metal parts. In one example, the material of the top wall 25 or the bottom wall 26 includes, but is not limited to, steel, aluminum, or aluminum alloy.

[0096] In one example, the top wall 25, bottom wall 26, first side wall 21, third side wall 23, and fourth side wall 24 are all made of the same material. The top wall 25, bottom wall 26, first side wall 21, third side wall 23, and fourth side wall 24 are connected to form a cylindrical structure with an opening, and the second side wall 22 is connected to the top wall 25, third side wall 23, bottom wall 26, and fourth side wall 24 and seals the opening.

[0097] In the embodiments of this application, see Figure 1 As shown, a gas channel 110 is formed between the cover 40 and the shell 20, and the gas channel 110 connects the electrical compartment 50 with the external environment.

[0098] The cover 40 does not have a heat dissipation opening that connects to the external environment. The electrical compartment 50 can exchange gases with the external environment through the gas channel 110. The heat generated by the electronic components can be dissipated to the external environment through the gas channel 110, so that the electronic components are at normal operating temperature.

[0099] In one example, a gap is formed between the cover 40 and at least one of the third sidewall 23, top wall 25, fourth sidewall 24, and bottom wall 26, and the gas passage 110 includes this gap. The gas passage 110 allows depressurized gas to be discharged to the outside of the battery pack 10, improving the safety of the battery pack 10.

[0100] In this embodiment of the application, the battery pack 10 includes a sealing member (not shown in the figure), which blocks part of the first opening 201, and the conductive member 100 and the detector 62 pass through the sealing member.

[0101] After the conductive element 100 and the detector 62 pass through the first opening 201 and are installed, the sealing element is connected to the housing 20. The conductive element 100 and the detector 62 pass through the sealing element, and there is no positional interference between the conductive element 100 and the detector 62 and the sealing element. This reduces the possibility that the conductive element 100 and the detector 62 may be damaged due to excessive compression of the conductive element 100 and the detector 62 by the sealing element.

[0102] The sealing element can prevent external debris from entering the containment space 202 through the electrical compartment 50 and the first opening 201, thereby improving the safety of the battery pack 10. In the event of thermal runaway of the battery cell 31, the sealing element can be blasted open or melted to open the first opening 201, allowing the fire-fighting medium to quickly enter the electrical compartment 50 through the first opening 201.

[0103] In one example, the sealing element may be, but is not limited to, adhesive, foam, or plastic structural components.

[0104] This application embodiment also provides an energy storage device, including a battery pack 10 of any of the above schemes.

[0105] Energy storage devices are used in energy storage power stations, wind power generation systems, solar power generation systems, mobile power systems, or temporary power supply systems. Energy storage devices can store electrical energy as needed and output it when appropriate. For example, energy storage devices can store electrical energy during off-peak hours and provide power to relevant users or electrical equipment during peak hours.

[0106] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery pack characterized by comprising: The battery pack comprises: a housing comprising a first opening and a receiving space; an electric core assembly arranged in the receiving space, the electric core assembly comprising a plurality of electric cores; a cover arranged outside the housing, the cover being connected with the housing and forming an electric compartment, the first opening being in communication with the receiving space and the electric compartment; a fire-fighting assembly comprising a fire-fighting member and a detection member, the fire-fighting member being arranged in the receiving space, the detection member being connected with the fire-fighting member, the fire-fighting member storing fire-fighting medium, and a part of the detection member being arranged outside the first opening and in the electric compartment.

2. The battery pack according to claim 1, wherein: the housing comprises a first side wall and a second side wall arranged in a first direction, the second side wall being provided with the first opening, in the first direction, the electric core assembly, the fire-fighting member and the second side wall are arranged in sequence.

3. The battery pack according to claim 2, wherein: the housing comprises a third side wall and a fourth side wall arranged in a second direction, the first direction being perpendicular to the second direction, the electric core assembly and the fire-fighting member form a first gap with the third side wall, the first opening being arranged to face and communicate with the first gap, the fire-fighting member comprises a containing portion and a releasing portion, the containing portion storing fire-fighting medium, the releasing portion being arranged to face the first gap, and a part of the detection member being arranged in the first gap.

4. The battery pack according to any one of claims 2 or 3, wherein: an area of the second side wall other than the first opening is in a closed shape.

5. The battery pack according to any one of claims 1 to 4, wherein: the electric core comprises a pressure relief portion, and a side of the electric core provided with the pressure relief portion is provided with the detection member.

6. The battery pack according to claim 5, wherein: the electric core comprises a top sealing portion, the pressure relief portion comprises the top sealing portion, and the detection member is arranged outside a plurality of the top sealing portions.

7. The battery pack according to any one of claims 1 to 6, wherein: the battery pack comprises a circuit board and a conductive member, the circuit board being arranged in the electric compartment, the conductive member passes through the first opening, and the conductive member connects the circuit board and the electric core assembly.

8. The battery pack according to any one of claims 1 to 7, wherein: the housing comprises a first side wall and a second side wall arranged in a first direction, a third side wall and a fourth side wall arranged in a second direction, and a top wall and a bottom wall arranged in a third direction, the first direction, the second direction and the third direction being perpendicular to each other, the first side wall, the second side wall, the third side wall, the fourth side wall, the top wall and the bottom wall are connected with each other to form the receiving space, and the second side wall is provided with the first opening, the first side wall, the third side wall, the fourth side wall, the top wall and the bottom wall are in a closed structure.

9. The battery pack according to any one of claims 1 to 8, wherein: A gas passage is formed between the cover and the case, and the gas passage communicates the electric compartment with an external environment.

10. An energy storage device, characterized by, A battery pack comprising the battery as claimed in any one of claims 1 to 9.

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