Battery packs and electrical equipment

Abstract

The present application provides a battery pack and an electrical device. The battery pack includes a liquid cooling component, a first battery module and a fire-fighting component. The liquid cooling component has a housing. The first battery module is arranged in the liquid cooling component. The first battery module is spaced apart from the housing. At least part of the fire-fighting component is arranged in the housing and exposed in the housing. The fire-fighting component includes a shell and a fire-fighting medium. The fire-fighting medium is arranged in the shell, and the shell is configured so that when the temperature reaches a first threshold, the shell ruptures to release the fire-fighting medium, and the first threshold ranges from 70℃ to 200℃. The battery pack provided in the present application can improve the safety of the battery pack.

Description

Technical Field

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

[0002] Battery packs include battery modules. Battery modules refer to devices that can be used continuously by activating active materials through charging after the battery cells are discharged. Battery packs are widely used in electrical devices such as mobile phones, laptops, power tools, vehicles, etc. In the development of battery technology, how to ensure the safety of battery packs is one of the research directions in battery technology. Summary of the invention

[0003] In view of the above problems, the present application provides a battery pack and an electrical device, which can improve the safety of the battery pack.

[0004] The present application provides a battery pack, which includes a liquid cooling component, a first battery module and a fire protection component.

[0005] The liquid cooling part has a receiving portion. The first battery module is arranged in the liquid cooling part. The first battery module is arranged at a distance from the receiving portion. At least part of the fire-fighting part is arranged in the receiving portion and exposed in the receiving portion. The fire-fighting part includes a shell and a fire-fighting medium. The fire-fighting medium is arranged in the shell, and the shell is configured so that when the temperature reaches a first threshold, the shell ruptures to release the fire-fighting medium, and the range of the first threshold is 70°C-200°C.

[0006] The battery pack of the embodiment of the present application includes a liquid cooling component and a fire-fighting component. A housing portion is provided on the liquid cooling component. The fire-fighting component is provided in the housing portion and is exposed in the housing portion. In the embodiment of the present application, a fire-fighting component is built into the battery pack that has been processed and manufactured. When the battery pack is in normal working condition, the liquid cooling component is mainly used to cool the battery module, and the fire-fighting component is in a non-triggered state. In the event of thermal runaway of the battery cell, the temperature of the internal environment of the battery pack rises. The shell can absorb heat to heat up the shell. When the shell temperature reaches a first threshold, the shell will automatically rupture. After the shell ruptures, the fire-fighting medium in the shell is released. The fire-fighting medium can cool down and extinguish the battery cell in thermal runaway to reduce the possibility of the spread of thermal runaway and improve the safety of the battery pack.

[0007] In one or more of the above optional embodiments, along the first direction, the liquid cooling component includes a first side and a second side relative to each other; the battery pack includes a second battery module, the first battery module and the second battery module are arranged on the first side of the liquid cooling component, and along the second direction, the first battery module and the second battery module are arranged at intervals; observed along the first direction, along the second direction, the first battery module and the second battery module are located on both sides of the shell, and the first direction is perpendicular to the second direction.

[0008] The fire-fighting device can reuse the space between the first battery module and the second battery module, thereby improving the utilization rate of the internal space of the battery pack. In addition, when the battery cells in at least one of the first battery module and the second battery module undergo thermal runaway, the fire-fighting device can cool down and extinguish the battery cells in at least one of the first battery module and the second battery module, and the fire-fighting device cools down and extinguishes the first battery module and the second battery module at the same time.

[0009] The first battery module and the second battery module are both arranged on the liquid cooling element. The liquid cooling element can simultaneously perform heat exchange with the first battery module and the second battery module, thereby facilitating the improvement of heat dissipation efficiency.

[0010] In one or more of the above optional embodiments, part of the shell is located outside the accommodating portion, and part of the shell is located between the first battery module and the second battery module.

[0011] When the battery cell experiences thermal runaway, the temperature of the internal space of the battery pack rises at a relatively fast rate. Therefore, the portion of the shell outside the accommodating portion can absorb more heat relatively quickly, and the temperature of the portion of the shell outside the accommodating portion rises relatively quickly, which is conducive to the temperature of the shell reaching the first threshold relatively quickly, thereby improving the response rate of the fire-fighting component.

[0012] In one or more of the above optional embodiments, the first battery module includes a plurality of first battery cells, each of which includes a first main body and a first pressure relief portion; the second battery module includes a plurality of second battery cells, the second battery cells include a second main body and a second pressure relief portion, the first pressure relief portion is located on a side of the first main body close to the second battery cell, and the second pressure relief portion is located on a side of the second main body close to the first battery cell; observed along the first direction, along the second direction, at least part of the first pressure relief portion is located on one side of the shell, and at least part of the second pressure relief portion is located on the other side of the shell.

[0013] When the first battery cell experiences thermal runaway, the first battery cell can discharge high-temperature substances through the first pressure relief part to achieve pressure relief. When the second battery cell experiences thermal runaway, the second battery cell can discharge high-temperature substances through the second pressure relief part to achieve pressure relief. The first pressure relief part and the second pressure relief part are respectively arranged on both sides of the fire-fighting part, and the distance between the first pressure relief part and the second pressure relief part and the fire-fighting part is relatively small. The high-temperature substances discharged when at least one of the first pressure relief part and the second pressure relief part releases pressure can act on the fire-fighting part relatively directly and faster, so that the shell temperature reaches the first threshold relatively quickly, so that the shell can rupture and release the fire-fighting medium in a short time after the battery cell experiences thermal runaway, thereby improving the response rate of the fire-fighting part.

[0014] In one or more optional embodiments above, the first battery cell includes two first electrode terminals and at least one first sealing portion, the first electrode terminal extends out of the first sealing portion, and each first pressure relief portion includes a first sealing portion; the second battery cell includes two second electrode terminals and at least one second sealing portion, the second electrode terminal extends out of the second sealing portion, and each second pressure relief portion includes a second sealing portion.

[0015] In one or more of the above optional embodiments, the battery pack includes a first thermally conductive adhesive and a second thermally conductive adhesive, the first thermally conductive adhesive bonds the first main body and the liquid cooling component, and the thermal conductivity of the first thermally conductive adhesive is 0.5-2.5W / (m·K); the second thermally conductive adhesive bonds the second main body and the liquid cooling component, and the thermal conductivity of the second thermally conductive adhesive is 0.5-2.5W / (m·K).

[0016] A first heat-conducting adhesive is arranged between the first main body and the liquid cooling element, which is conducive to a relatively high heat exchange efficiency between the first main body and the liquid cooling element. A second heat-conducting adhesive is arranged between the second main body and the liquid cooling element, which is conducive to a relatively high heat exchange efficiency between the second main body and the liquid cooling element.

[0017] In one or more optional embodiments above, the first heat conductive adhesive is bonded to the first pressure relief part and the liquid cooling part, and the second heat conductive adhesive is bonded to the second pressure relief part and the liquid cooling part. The first heat conductive adhesive is bonded to the first pressure relief part and the liquid cooling part, which is conducive to fixing the position of the first pressure relief part, and the high-temperature material sprayed from the first pressure relief part can act on the shell relatively quickly, so as to facilitate the temperature of the shell to reach the first threshold relatively quickly, thereby improving the response rate of the fire protection part.

[0018] The second thermally conductive adhesive bonds the second pressure relief part and the liquid cooling part, which is beneficial to fixing the position of the second pressure relief part. The high-temperature substance sprayed from the second pressure relief part can act on the shell relatively quickly, so as to help the temperature of the shell reach the first threshold relatively quickly, thereby improving the response rate of the fire-fighting part.

[0019] In one or more of the above optional embodiments, the battery pack includes a third battery module and a fourth battery module, and the third battery module and the fourth battery module are arranged on the second side of the liquid cooling component; the accommodating portion passes through the liquid cooling component, and when observed in a direction opposite to the first direction, along the second direction, the third battery module and the fourth battery module are located on both sides of the shell.

[0020] The fire-fighting parts can reuse the space between the first battery module and the second battery module and the space between the third battery module and the fourth battery module, thereby improving the utilization rate of the internal space of the battery pack. In addition, when the battery cells in at least one of the first battery module, the second battery module, the third battery module and the fourth battery module are in thermal runaway, the fire-fighting parts can cool down and extinguish the battery cells in at least one of the first battery module, the second battery module, the third battery module and the fourth battery module, thereby providing a relatively small number of fire-fighting parts to cool down and extinguish the first battery module, the second battery module, the third battery module and the fourth battery module at the same time.

[0021] In one or more optional embodiments above, the third battery module includes a plurality of third battery cells, each of which includes a third main body and a third pressure relief portion, the fourth battery module includes a plurality of fourth battery cells, each of which includes a fourth main body and a fourth pressure relief portion, the third pressure relief portion is located on a side of the third main body close to the fourth battery cell, and the fourth pressure relief portion is located on a side of the third battery cell of the fourth main body; observed in a direction opposite to the first direction, along the second direction, at least a portion of the third pressure relief portion is located on one side of the shell, and at least a portion of the fourth pressure relief portion is located on the other side of the shell.

[0022] The third pressure relief part and the fourth pressure relief part are respectively arranged on both sides of the fire-fighting part, and the distance between the third pressure relief part and the fourth pressure relief part and the fire-fighting part is relatively small. The high-temperature substance discharged when at least one of the first pressure relief part, the second pressure relief part, the third pressure relief part and the fourth pressure relief part releases pressure can act on the fire-fighting part relatively directly and faster, so that the shell temperature reaches the first threshold relatively quickly, so that the shell can rupture and release the fire-fighting medium in a short time after the battery cell has thermal runaway, thereby improving the response rate of the fire-fighting part.

[0023] In one or more of the above optional embodiments, the battery pack includes a third thermally conductive adhesive and a fourth thermally conductive adhesive, the third thermally conductive adhesive bonds the third main body and the liquid cooling component; the thermal conductivity of the third thermally conductive adhesive is 0.5-2.5W / (m·K); the fourth thermally conductive adhesive bonds the fourth main body and the liquid cooling component, and the thermal conductivity of the fourth thermally conductive adhesive is 0.5-2.5W / (m·K).

[0024] A third heat-conducting adhesive is arranged between the third main body and the liquid cooling element, which is conducive to a relatively high heat exchange efficiency between the third main body and the liquid cooling element. A fourth heat-conducting adhesive is arranged between the fourth main body and the liquid cooling element, which is conducive to a relatively high heat exchange efficiency between the fourth main body and the liquid cooling element.

[0025] In one or more of the above optional embodiments, the battery pack includes a battery management circuit board, the fire-fighting component includes a wire, the wire is connected to the battery management circuit board, and the fire-fighting component includes a detection component, the detection component is configured to detect whether the fire-fighting component is broken and transmit the signal to the battery management circuit board through the wire.

[0026] The battery management circuit board controls the charging and discharging of the battery pack according to whether the shell is broken. For example, after the shell is broken, the battery management circuit board controls to stop the charging and discharging of the battery pack.

[0027] In one or more of the above optional embodiments, the first threshold value of the shell is greater than the boiling point of the fire-fighting medium.

[0028] In the battery pack that has been processed and manufactured, the fire-fighting working fluid stored in the shell can be in liquid state. When the battery cell has thermal runaway, the shell continuously absorbs heat to increase the temperature of the shell. When the temperature of the shell reaches the boiling point of the liquid fire-fighting working fluid, the liquid fire-fighting working fluid can be converted into a gaseous fire-fighting working fluid. At this time, the temperature of the shell has not reached the first threshold. When the temperature of the shell continues to rise until it reaches the first threshold of the shell, the shell ruptures to release the gaseous fire-fighting working fluid. Before the shell ruptures, the fire-fighting working fluid in the shell can be vaporized, and the fire-fighting working fluid absorbs heat when vaporized, further reducing the temperature of the battery pack. Once the shell ruptures, the gaseous fire-fighting working fluid can quickly fill the internal space of the battery pack, thereby increasing the response rate of the fire-fighting components.

[0029] In one or more of the above optional embodiments, part of the shell is located outside the accommodating portion, and part of the shell is located between the third battery module and the fourth battery module.

[0030] When the battery cell experiences thermal runaway, the temperature of the internal space of the battery pack rises at a relatively fast rate. Therefore, the portion of the shell outside the accommodating portion can absorb more heat relatively quickly, so that the temperature of the portion of the shell outside the accommodating portion rises at a relatively fast rate, which is conducive to the temperature of the shell reaching the first threshold relatively quickly, thereby improving the response rate of the fire-fighting component.

[0031] In one or more optional embodiments above, the third heat-conducting adhesive bonds the third pressure relief portion and the liquid cooling component, and the fourth heat-conducting adhesive bonds the fourth pressure relief portion and the liquid cooling component.

[0032] In one or more optional embodiments above, the third battery cell includes two third electrode terminals and at least one third sealing portion, the third electrode terminal extends out of the third sealing portion, and the third pressure relief portion includes a third sealing portion, and the fourth battery cell includes two fourth electrode terminals and at least one fourth sealing portion, the fourth electrode terminal extends out of the fourth sealing portion, and the fourth pressure relief portion includes a fourth sealing portion.

[0033] In one or more optional embodiments above, the third heat-conducting adhesive bonds the third pressure relief portion and the liquid cooling component, and the fourth heat-conducting adhesive bonds the fourth pressure relief portion and the liquid cooling component.

[0034] The third heat-conducting adhesive bonds the third pressure relief part and the liquid cooling part, which is conducive to fixing the position of the third pressure relief part. The high-temperature substance sprayed from the third pressure relief part can act on the shell relatively quickly, which is conducive to the temperature of the shell reaching the first threshold relatively quickly, thereby improving the response rate of the fire-fighting part. The fourth heat-conducting adhesive bonds the fourth pressure relief part and the liquid cooling part, which is conducive to fixing the position of the fourth pressure relief part. The high-temperature substance sprayed from the fourth pressure relief part can act on the shell relatively quickly, which is conducive to the temperature of the shell reaching the first threshold relatively quickly, thereby improving the response rate of the fire-fighting part.

[0035] In one or more optional embodiments above, the battery pack includes a shell and a pressure relief portion, the pressure relief portion is arranged on the shell, and the fire-fighting component is arranged opposite to the pressure relief portion.

[0036] When thermal runaway occurs in the battery cell, the pressure relief portion is configured to open the pressure relief in response to the internal pressure of the battery pack reaching a threshold value, so as to reduce the possibility of explosion due to the continuous increase in internal pressure of the battery pack. When the temperature of the shell is configured to reach a first threshold value, the shell ruptures to release the gaseous fire-fighting medium, and the density of the gaseous fire-fighting medium is greater than the density of air. When the pressure relief portion is opened, the gaseous fire-fighting medium can squeeze the air in the battery pack out through the pressure relief portion, and a part of the gaseous fire-fighting medium can also be discharged with the air. The fire-fighting medium discharged to the outside of the battery pack can reduce the oxygen concentration around the pressure relief portion and improve the safety of the battery pack.

[0037] In one or more of the above optional embodiments, the battery pack includes two main electrodes with opposite polarities, the two main electrodes are located on the same side of the battery pack, and the main electrodes and the pressure relief part are respectively located on two sides of the battery pack.

[0038] The pressure relief direction of the pressure relief part can be opposite to the main electrode. The distance between the main electrode and the pressure relief part is relatively large. When the pressure relief part releases pressure, the possibility of structural damage to the main electrode due to impact or high temperature is reduced.

[0039] In one or more of the above optional embodiments, the liquid cooling component includes an inlet and an outlet, the inlet and the outlet are located on the same side of the battery pack, and the inlet and the pressure relief portion are respectively located on two sides of the battery pack.

[0040] The pressure relief direction of the pressure relief part can be away from the inlet and outlet of the liquid cooling part. The distance between the inlet and outlet of the liquid cooling part and the pressure relief part is relatively large. When the pressure relief part releases pressure, the possibility of structural damage to the inlet and outlet of the liquid cooling part due to impact or high temperature is reduced, which is conducive to the liquid cooling part still being able to circulate the cooling medium normally in the case of thermal runaway of the battery cell, so as to cool down the battery pack as a whole.

[0041] In one or more of the above optional embodiments, a heat-conducting adhesive is provided between the fire-fighting component and the liquid-cooling component, and the heat-conducting adhesive bonds the fire-fighting component and the liquid-cooling component.

[0042] The fire-fighting parts and the liquid-cooling parts are bonded with the heat-conducting adhesive, which is beneficial to a relatively high heat exchange efficiency between the fire-fighting parts and the liquid-cooling parts, and is beneficial to the heat transfer of the liquid-cooling parts to the fire-fighting parts.

[0043] In one or more of the above optional embodiments, the material of the fire-fighting fluid includes perfluorohexanone.

[0044] In one or more of the above optional embodiments, the first threshold value of the shell may range from 80°C to 140°C, and the boiling point range of the fire-fighting medium is 45°C to 80°C.

[0045] In one or more of the above optional embodiments, the shell is configured such that when the temperature of the shell reaches a first threshold, the shell ruptures to release the gaseous fire-fighting medium, and the density of the gaseous fire-fighting medium is greater than the density of air.

[0046] When the pressure relief part is opened, the gaseous fire-fighting medium can squeeze out the air in the battery pack through the pressure relief part, and the gaseous fire-fighting medium can also be partially discharged with the air. The fire-fighting medium discharged to the outside of the battery pack can reduce the oxygen concentration around the pressure relief part and improve the safety of the battery pack.

[0047] An embodiment of the present application provides an electrical device, which includes a battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Also, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0049] Figure 1 is a three-dimensional schematic diagram of a battery pack provided by an embodiment of the present application;

[0050] Figure 2 is a schematic diagram of the exploded structure of a battery pack provided in one embodiment of the present application;

[0051] Figure 3 is a partial structural schematic diagram of a battery pack provided in one embodiment of the present application;

[0052] Figure 4 It is a partial structural schematic diagram of a liquid cooling component provided in one embodiment of the present application;

[0053] Figure 5is a schematic diagram of a partial exploded structure of a battery pack provided in one embodiment of the present application;

[0054] Figure 6 is a partial structural schematic diagram of a battery pack provided in one embodiment of the present application;

[0055] Figure 7 It is a partial structural schematic diagram of a battery cell provided in one embodiment of the present application;

[0056] Figure 8 is a schematic diagram of a partial exploded structure of a battery pack provided in one embodiment of the present application;

[0057] Fig. 9 It is a partial structural schematic diagram of a liquid cooling component provided in one embodiment of the present application;

[0058] Fig.10 is a partial structural schematic diagram of a battery pack provided in one embodiment of the present application;

[0059] Fig.11 is a partial structural schematic diagram of a battery pack provided in one embodiment of the present application;

[0060] Fig.12 is a partial structural schematic diagram of a battery pack provided in one embodiment of the present application;

[0061] Fig.13 It is a schematic diagram of the partial structure of a battery pack provided in one embodiment of the present application.

[0062] Description of reference numerals:

[0063] 10. Battery pack; 101. First battery module; 102. Second battery module; 103. Third battery module; 104. Fourth battery module; 10a. Battery management circuit board;

[0064] 20, liquid cooling part; 20a, first side; 20b, second side; 201, inlet; 202, outlet; 21, accommodation part;

[0065] 30. Fire protection parts; 31. Shell; 32. Wire; 33. Detection parts;

[0066] 40. first battery cell; 41. first main body; 42. first pressure relief portion; 401. first electrode terminal; 402. first sealing portion;

[0067] 50, second battery cell; 51, second main body; 52, second pressure relief portion; 501, second electrode terminal; 502, second sealing portion;

[0068] 60, third battery cell; 61, third main body; 62, third pressure relief portion; 601, third electrode terminal; 602, third sealing portion;

[0069] 70, fourth battery cell; 71, fourth main body; 72, fourth pressure relief portion; 701, fourth electrode terminal; 702, fourth sealing portion;

[0070] 80. The first thermal conductive adhesive;

[0071] 90. Second thermal conductive adhesive;

[0072] 100. The third thermal conductive adhesive;

[0073] 110, fourth thermal conductive adhesive;

[0074] 120, housing;

[0075] 130. Pressure relief unit;

[0076] 140, cover plate;

[0077] 150, total electrode;

[0078] X, first direction;

[0079] Y, second direction;

[0080] Z. The third direction. DETAILED DESCRIPTION

[0081] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0082] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in the embodiments of the present application should have the common meanings understood by technicians in the field to which the embodiments of the present application belong.

[0083] In the description of the embodiments of the present application, the orientations or positional relationships indicated by technical terms such as "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on the embodiments of the present application.

[0084] In addition, the technical terms "first", "second", etc. are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0085] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0086] In the related art, a battery pack includes multiple battery modules. A battery module refers to a module that includes battery cells. When the battery cells inside the battery module experience thermal runaway, a large amount of high-temperature substances, such as flammable gases or high-temperature particulate matter, will be generated. There is a possibility that the internal temperature and pressure of the battery pack will continue to rise, and there is a possibility that the battery pack structural components will fail and cause the battery pack to explode.

[0087] Based on the above considerations, an embodiment of the present application provides a battery pack. The battery pack includes a liquid cooling component and a fire-fighting component. In the event of thermal runaway of the battery cell, the fire-fighting component itself ruptures to release the fire-fighting medium. The gaseous fire-fighting medium can dilute the oxygen concentration in the internal space of the battery pack, thereby reducing the oxygen content. The combustible gas generated by the battery cell is in a relatively oxygen-deficient environment, so the combustible gas is not easy to burn, which helps to reduce the possibility of thermal runaway spreading and improve the safety of the battery pack. The liquid cooling component can continuously cool the battery module that has thermal runaway to reduce the possibility of rapid temperature rise in the battery module and improve the safety of the battery pack.

[0088] Figure 1 A perspective view of the battery pack 10 is schematically shown. Figure 2 The exploded structure of the battery pack 10 is schematically shown. Figure 3 A partial structure of the battery pack 10 is schematically shown. Figure 4 The partial structure of the liquid cooling unit 20 is schematically shown. Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, an embodiment of the present application provides a battery pack 10 , which includes a liquid cooling component 20 , a first battery module 101 and a fire protection component 30 .

[0089] The liquid cooling part 20 has a housing 21. The first battery module 101 is disposed in the liquid cooling part 20. The first battery module 101 is spaced apart from the housing 21. At least part of the fire-fighting part 30 is disposed in the housing 21, and the fire-fighting part 30 is exposed in the housing 21. The fire-fighting part 30 includes a shell 31 and a fire-fighting medium. The fire-fighting medium is disposed in the shell 31. When the temperature of the shell 31 reaches a first threshold, the shell 31 ruptures to release the fire-fighting medium. The shell 31 has an internal sealed chamber. The shell 31 is in a sealed environment. The fire-fighting medium is disposed in the internal sealed chamber of the shell 31.

[0090] In some embodiments, the first threshold ranges from 70° C. to 200° C., which is beneficial to improving the safety performance of the battery pack 10 .

[0091] In some embodiments, the first threshold value ranges from 80° C. to 140° C., which is beneficial to further improve the safety performance of the battery pack 10 .

[0092] In some embodiments, the accommodating portion 21 may be a recessed portion, and the fire-fighting component 30 is exposed in the recessed portion.

[0093] In the embodiment of the present application, a cooling medium may circulate in the liquid cooling element 20. For example, the cooling medium may include but is not limited to water. The liquid cooling element 20 may be used to perform heat exchange with the first battery module 101 to cool the first battery module 101, which is beneficial for the battery cell to exert good electrical performance.

[0094] The first battery module 101 is spaced apart from the accommodating portion 21, so that there is a distance between the first battery module 101 and the accommodating portion 21. The first battery module 101 avoids the accommodating portion 21. A part of the fire-fighting component 30 or the whole fire-fighting component 30 can be arranged in the accommodating portion 21. A part of the fire-fighting component 30 is exposed to be in a visible state, which is conducive to the rupture of the shell 31 and the release of the fire-fighting medium when the first battery module 101 thermally runs away.

[0095] The shell 31 itself has heat resistance. The heat resistance of the shell 31 has an upper temperature limit. The upper temperature limit serves as a first threshold. When thermal runaway occurs in the battery cell, the shell 31 absorbs heat and the temperature rises. When the shell 31 reaches the first threshold, the shell 31 ruptures to release the fire-fighting medium inside.

[0096] In some practicable embodiments, a liquid fire-fighting medium is disposed in the housing 31. After being discharged from the housing 31, the fire-fighting medium can be converted into a gaseous fire-fighting medium upon encountering high temperature to fill the internal space of the battery pack 10 and dilute the oxygen concentration.

[0097] In some practicable embodiments, a compressed gaseous fire-fighting medium is disposed in the shell 31. After the shell 31 is ruptured, the gaseous fire-fighting medium fills the internal space of the battery pack 10 and dilutes the oxygen concentration.

[0098] In some feasible embodiments, a liquid fire-fighting medium is provided in the shell 31. As the temperature of the shell 31 increases, the liquid fire-fighting medium is converted into a gaseous fire-fighting medium before the shell 31 ruptures. The gasification process of the fire-fighting medium will absorb a portion of the heat and reduce the temperature of the battery pack 10. After the shell 31 ruptures, the gaseous fire-fighting medium fills the internal space of the battery pack 10 and dilutes the oxygen concentration. The gaseous fire-fighting medium can help reduce the oxygen content in the internal space of the battery pack 10. Since the high-temperature substances generated by the battery cells in thermal runaway are in a relatively oxygen-deficient environment, it is helpful to reduce the possibility of the spread of thermal runaway and improve the safety of the battery pack 10. The fire-fighting medium in the fire-fighting component 30 can be used to cool down and extinguish the battery cells in thermal runaway.

[0099] When thermal runaway occurs in the battery cell, the liquid cooling component 20 can also transfer heat to the fire protection component 30, so that the shell 31 can absorb heat from the liquid cooling component 20 and the heat from the surrounding environment at the same time, so that the temperature of the shell 31 can rise and reach the first threshold, triggering the rupture of the shell 31 more quickly, thereby improving the safety performance of the battery pack 10.

[0100] In some achievable ways, a heat-conducting adhesive is provided between the fire-fighting component 30 and the liquid-cooling component 20, and the heat-conducting adhesive bonds the fire-fighting component 30 and the liquid-cooling component 20, which is beneficial for a relatively high heat exchange efficiency between the fire-fighting component 30 and the liquid-cooling component 20, and is beneficial for the heat of the liquid-cooling component 20 to be transferred to the fire-fighting component 30. In some examples, the heat-conducting adhesive may be, but is not limited to, heat-conducting silica gel. In some examples, the fire-fighting component 30 may be a tubular structure for easy transportation and storage. Optionally, the thermal conductivity of the heat-conducting adhesive may be 0.2W / (m·K) to 2.5W / (m·K).

[0101] In some achievable ways, the liquid cooling element 20 may be a metal plate. For example, the liquid cooling element 20 may be an aluminum plate or an aluminum alloy plate. The melting point of the liquid cooling element 20 itself is relatively high. In the event of thermal runaway of the battery cell, the liquid cooling element 20 itself is not easily melted due to the high temperature generated by the thermal runaway. The heat conduction efficiency of the liquid cooling element 20 is relatively high, which is conducive to the fact that in the event of thermal runaway of the battery cell, the liquid cooling element 20 can relatively quickly conduct heat to the fire protection element 30, so as to help increase the temperature of the shell 31.

[0102] In some achievable ways, Figure 5 The partial exploded structure of the battery pack 10 is schematically shown. Figure 2 and Figure 5As shown, the battery pack 10 includes a battery management circuit board 10a. The fire protection component 30 includes a wire 32. The wire 32 is connected to the battery management circuit board 10a. The fire protection component 30 includes a detection component 33. The detection component 33 is configured to detect whether the shell 31 is broken, and transmit a signal to the battery management circuit board 10a through the wire 32. The battery management circuit board 10a controls the charging and discharging of the battery pack 10 according to whether the shell 31 is broken. For example, after the shell 31 is broken, the battery management circuit board 10a controls to stop the charging and discharging of the battery pack 10.

[0103] In some achievable ways, the first threshold value of the shell 31 is greater than the boiling point of the fire-fighting medium. In the battery pack 10 that has been processed and manufactured, the fire-fighting medium stored in the shell 31 may be in liquid form. When the battery cell undergoes thermal runaway, the shell 31 continuously absorbs heat to increase the temperature of the shell 31. When the temperature of the shell 31 reaches the boiling point of the liquid fire-fighting medium, the liquid fire-fighting medium may be converted into a gaseous fire-fighting medium, at which point the temperature of the shell 31 does not reach the first threshold value. When the temperature of the shell 31 continues to rise until it reaches the first threshold value of the shell 31, the shell 31 ruptures to release the gaseous fire-fighting medium.

[0104] Before the shell 31 ruptures, the fire fighting medium in the shell 31 can be gasified, and the fire fighting medium absorbs heat when gasifying, further reducing the temperature of the battery pack 10. Once the shell 31 ruptures, the gaseous fire fighting medium can quickly fill the internal space of the battery pack 10, improving the response rate of the fire fighting component 30.

[0105] In some examples, the material of the housing 31 may include, but is not limited to, glass.

[0106] In some examples, the material of the fire-fighting fluid may include, but is not limited to, perfluorohexanone, ultrapure water, or fluorinated liquid. The first threshold of the housing 31 may range from 80°C (degrees Celsius) to 140°C, and the boiling point of the fire-fighting fluid may range from 45°C to 80°C. Exemplarily, the first threshold of the housing 31 may be 100°C, and the boiling point of the fire-fighting fluid may be 49°C.

[0107] In some achievable ways, Figure 6 The partial structure of the battery pack 10 is schematically shown. Figure 4 , Figure 6 and Fig. 9 As shown, along the first direction X, the liquid cooling member 20 includes a first side 20a and a second side 20b opposite to each other. The battery pack 10 includes a second battery module 102. The first battery module 101 and the second battery module 102 are arranged on the first side 20a of the liquid cooling member 20. Along the second direction Y, the first battery module 101 and the second battery module 102 are arranged at intervals. Fig.12As shown, when viewed along the first direction X, the first battery module 101 and the second battery module 102 are located on both sides of the housing 31 along the second direction Y. The first direction X is perpendicular to the second direction Y.

[0108] The fire-fighting component 30 can reuse the space between the first battery module 101 and the second battery module 102, thereby improving the utilization rate of the internal space of the battery pack 10. In addition, when the battery cells in at least one of the first battery module 101 and the second battery module 102 have thermal runaway, the fire-fighting component 30 can cool down and extinguish the battery cells in at least one of the first battery module 101 and the second battery module 102, and the fire-fighting component 30 cools down and extinguishes the first battery module 101 and the second battery module 102 at the same time.

[0109] The fire-fighting medium released by the shell 31 can cover the first battery module 101 and the second battery module 102 relatively quickly, which is conducive to cooling down and extinguishing the first battery module 101 and the second battery module 102 at the same time relatively quickly.

[0110] The first battery module 101 and the second battery module 102 are both disposed on the liquid cooling element 20. The liquid cooling element 20 can simultaneously perform heat exchange with the first battery module 101 and the second battery module 102, thereby facilitating the improvement of heat dissipation efficiency.

[0111] For some examples, see Figure 6 As shown, part of the housing 31 is located outside the receiving portion 21. Part of the housing 31 exceeds the receiving portion 21. Part of the housing 31 is located between the first battery module 101 and the second battery module 102.

[0112] When the battery cell experiences thermal runaway, the temperature rise rate of the internal space of the battery pack 10 is relatively fast. Therefore, the portion of the shell 31 outside the accommodating portion 21 can absorb more heat relatively quickly, and the temperature rise rate of the portion of the shell 31 outside the accommodating portion 21 is relatively fast, which is conducive to the temperature of the shell 31 reaching the first threshold relatively quickly, thereby improving the response rate of the fire-fighting component 30.

[0113] In some examples, the surface area of ​​the housing 31 outside the receiving portion 21 is greater than the surface area of ​​the housing 31 inside the receiving portion 21 .

[0114] In some examples, Figure 7 Schematic diagram showing the partial structure of the battery cell. Figure 6 and Figure 7As shown, the first battery module 101 includes a plurality of first battery cells 40. Each first battery cell 40 includes a first main body 41 and a first pressure relief portion 42. The second battery module 102 includes a plurality of second battery cells 50. Each second battery cell 50 includes a second main body 51 and a second pressure relief portion 52. The first pressure relief portion 42 is located on a side of the first main body 41 close to the second battery cell 50, and the second pressure relief portion 52 is located on a side of the second main body 51 close to the first battery cell 40.

[0115] In some embodiments, see Fig.12 As shown, viewed along the first direction X, along the second direction Y, at least part of the first pressure relief portion 42 is located on one side of the housing 31 , and at least part of the second pressure relief portion 52 is located on the other side of the housing 31 .

[0116] When the first battery cell 40 has thermal runaway, the first battery cell 40 can discharge high-temperature substances through the first pressure relief part 42 to achieve pressure relief. When the second battery cell 50 has thermal runaway, the second battery cell 50 can discharge high-temperature substances through the second pressure relief part 52 to achieve pressure relief. The first pressure relief part 42 and the second pressure relief part 52 are respectively arranged on both sides of the fire-fighting part 30, and the distance between the first pressure relief part 42 and the second pressure relief part 52 and the fire-fighting part 30 is relatively small. The high-temperature substances discharged when at least one of the first pressure relief part 42 and the second pressure relief part 52 releases pressure can act on the fire-fighting part 30 relatively directly and faster, so that the temperature of the shell 31 reaches the first threshold relatively quickly, so that the shell 31 can rupture and release the fire-fighting medium in a short time after the battery cell has thermal runaway, thereby improving the response rate of the fire-fighting part 30.

[0117] For some examples, see Figure 3 and Fig.12 As shown, among the multiple first pressure relief parts 42, a part of the first pressure relief parts 42 are located on one side of the fire-fighting part 30. Exemplarily, the multiple first battery cells 40 are arranged side by side along the third direction Z. The first direction X, the second direction Y and the third direction Z are perpendicular to each other. Along the third direction Z, the closer the first battery cell 40 is to the middle area in the first battery module 101, the greater the probability of thermal runaway. In the first battery module 101, the first pressure relief parts 42 of some of the first battery cells 40 close to the middle area along the third direction Z are located on one side of the fire-fighting part 30. In the first battery module 101, some of the first battery cells 40 close to the edge area along the third direction Z may not be arranged opposite to the fire-fighting part 30.

[0118] In some examples, all of the first pressure relief portions 42 are located on one side of the fire protection element 30 .

[0119] In some examples, among the plurality of second pressure relief portions 52, a portion of the second pressure relief portions 52 are located on one side of the fire-fighting component 30. Exemplarily, the plurality of second battery cells 50 are arranged side by side along the third direction Z. Along the third direction Z, the closer the second battery cell 50 is to the middle area in the second battery module 102, the greater the probability of thermal runaway. In the second battery module 102, the second pressure relief portions 52 of some second battery cells 50 close to the middle area along the third direction Z are located on one side of the fire-fighting component 30. In the second battery module 102, some second battery cells 50 close to the edge area along the third direction Z may not be arranged opposite to the fire-fighting component 30.

[0120] In some examples, all the second pressure relief portions 52 are located on one side of the fire protection element 30 .

[0121] In some examples, the first battery cell 40 is a square battery cell or a cylindrical battery cell, and the first pressure relief portion 42 is a pressure relief valve of a square battery cell or a pressure relief valve of a cylindrical battery cell. In some examples, the second battery cell 50 is a square battery cell or a cylindrical battery cell, and the second pressure relief portion 52 is a pressure relief valve of a square battery cell or a pressure relief valve of a cylindrical battery cell.

[0122] In some examples, the plurality of first battery cells 40 may be connected in series, in parallel, or in mixed connection. Mixed connection means that the plurality of first battery cells 40 are connected in series and in parallel.

[0123] In some examples, the plurality of second battery cells 50 may be connected in series, in parallel, or in mixed connection. Mixed connection means that the plurality of second battery cells 50 are connected in series and in parallel.

[0124] In some examples, the first battery cell 40 includes two first electrode terminals 401 and at least one first sealing portion 402 . The first electrode terminal 401 extends out of the first sealing portion 402 . The first pressure relief portion 42 includes one first sealing portion 402 .

[0125] For some examples, see Figure 6 and Figure 7 As shown, the first battery cell 40 includes two first electrode terminals 401 and two first sealing parts 402. A first sealing part 402 is respectively provided on opposite sides of the first main body 41. One first electrode terminal 401 extends from one first sealing part 402, and another first electrode terminal 401 extends from another first sealing part 402. One first sealing part 402 is arranged opposite to the fire protection part 30, and the first pressure relief part 42 includes the first sealing part 402.

[0126] In some examples, the first battery cell 40 includes two first electrode terminals 401 and a first sealing portion 402. The two first electrode terminals 401 extend from one first sealing portion 402. The first sealing portion 402 is disposed opposite to the fire protection element 30.

[0127] For some examples, see Figure 6 and Figure 7 As shown, the second battery cell 50 includes two second electrode terminals 501 and two second sealing parts 502. The second electrode terminals 501 extend the second sealing parts 502 respectively. One of the second sealing parts 502 is located on a side of the second main body 51 close to the first battery cell 40, and the second sealing part 502 is arranged opposite to the fire protection part 30. Each second pressure relief part 52 includes a second sealing part 502.

[0128] For some examples, see Figure 6 and Figure 7 As shown, the second battery cell 50 includes two second electrode terminals 501 and two second sealing parts 502. A second sealing part 502 is respectively provided on opposite sides of the second main body 51. One second electrode terminal 501 extends from one second sealing part 502, and another second electrode terminal 501 extends from another second sealing part 502. One second sealing part 502 is provided opposite to the fire protection part 30.

[0129] In some embodiments, see Fig.12 As shown, when viewed along the first direction X, along the second direction Y, part of the housing 31 is located between the first sealing portion 402 and the second sealing portion 502 , wherein the first sealing portion 402 is the first pressure relief portion 42 , and the second sealing portion 502 is the second pressure relief portion 52 .

[0130] In some examples, the second battery cell 50 includes two second electrode terminals 501 and a second sealing portion 502. The two second electrode terminals 501 extend from one second sealing portion 502. The second sealing portion 502 is disposed opposite to the fire protection element 30.

[0131] In some examples, Figure 8 The partial exploded structure of the battery pack 10 is schematically shown. Figure 8 As shown, the battery pack 10 includes a first thermally conductive adhesive 80. The first thermally conductive adhesive 80 bonds the first main body 41 and the liquid cooling member 20. The first thermally conductive adhesive 80 is arranged between the first main body 41 and the liquid cooling member 20, which is conducive to a relatively high heat exchange efficiency between the first main body 41 and the liquid cooling member 20. The thermal conductivity of the first thermally conductive adhesive 80 is 0.5W / (m·K) to 2.5W / (m·K). Exemplarily, the thermal conductivity of the first thermally conductive adhesive 80 is 1.0W / (m·K) to 2.5W / (m·K). For example, the thermal conductivity of the first thermally conductive adhesive 80 is 1.5W / (m·K), 1.8W / (m·K), and 2.0W / (m·K). Exemplarily, the first thermally conductive adhesive 80 includes but is not limited to thermally conductive silica gel.

[0132] Exemplarily, the first main body 41 is directly bonded to the liquid cooling member 20 through the first heat conductive adhesive 80. Alternatively, the liquid cooling member 20 is a metal plate. An insulating sheet is disposed on the liquid cooling member 20. The first main body 41 is bonded to the insulating sheet through the first heat conductive adhesive 80.

[0133] In some examples, the battery pack 10 includes a second thermally conductive adhesive 90, and the second thermally conductive adhesive 90 is bonded to the second main body 51 and the liquid cooling member 20. The second thermally conductive adhesive 90 is arranged between the second main body 51 and the liquid cooling member 20, which is conducive to a relatively high heat exchange efficiency between the second main body 51 and the liquid cooling member 20. The thermal conductivity of the second thermally conductive adhesive 90 is 0.5W / (m·K) to 2.5W / (m·K). Exemplarily, the thermal conductivity of the second thermally conductive adhesive 90 is 1.0W / (m·K) to 2.5W / (m·K). For example, the thermal conductivity of the second thermally conductive adhesive 90 is 1.5W / (m·K), 1.8W / (m·K), 2.0W / (m·K). Exemplarily, the second thermally conductive adhesive 90 includes but is not limited to thermally conductive silicone.

[0134] Exemplarily, the second main body 51 is directly bonded to the liquid cooling member 20 through the second heat conductive adhesive 90. Alternatively, the liquid cooling member 20 is a metal plate. An insulating sheet is disposed on the liquid cooling member 20. The second main body 51 is bonded to the insulating sheet through the second heat conductive adhesive 90.

[0135] In some examples, the first thermally conductive adhesive 80 bonds the first pressure relief portion 42 and the liquid cooling component 20, which is beneficial to fixing the position of the first pressure relief portion 42. The high-temperature substance sprayed from the first pressure relief portion 42 can act on the shell 31 relatively quickly, so as to facilitate the temperature of the shell 31 to reach the first threshold relatively quickly, thereby improving the response rate of the fire protection component 30.

[0136] For some examples, see Figure 2 and Figure 6 As shown, the first heat conductive adhesive 80 adheres the first sealing part 402 and the liquid cooling part 20, which is conducive to fixing the position of the first sealing part 402. When the battery cell has thermal runaway, the first sealing part 402 is not easy to change the pressure relief direction under the impact of the jet. The first sealing part 402 is arranged opposite to the fire protection part 30.

[0137] In some examples, the second thermally conductive adhesive 90 bonds the second pressure relief portion 52 and the liquid cooling component 20, which is beneficial to fixing the position of the second pressure relief portion 52. The high-temperature substance sprayed from the second pressure relief portion 52 can act on the shell 31 relatively quickly, so as to facilitate the temperature of the shell 31 to reach the first threshold relatively quickly, thereby improving the response rate of the fire protection component 30.

[0138] For some examples, see Figure 2 and Figure 6As shown, the second heat conductive adhesive 90 bonds the second sealing portion 502 and the liquid cooling member 20. This is beneficial for fixing the position of the second sealing portion 502. When the battery cell undergoes thermal runaway, the second sealing portion 502 is not likely to change its pressure relief direction under the impact of the jet. The second sealing portion 502 is disposed opposite to the fire protection member 30.

[0139] In some achievable ways, Fig. 9 The partial structure of the liquid cooling unit 20 is schematically shown. Figure 4 , Figures 6 to 9 As shown, the battery pack 10 includes a third battery module 103 and a fourth battery module 104. The third battery module 103 and the fourth battery module 104 are arranged on the second side 20b of the liquid cooling member 20. The receiving portion 21 passes through the liquid cooling member 20. Fig.13 As shown, viewed along a direction opposite to the first direction X, along a second direction Y, the third battery module 103 and the fourth battery module 104 are located on both sides of the housing 31 .

[0140] The fire-fighting component 30 can reuse the space between the first battery module 101 and the second battery module 102 and the space between the third battery module 103 and the fourth battery module 104, thereby improving the utilization rate of the internal space of the battery pack 10. In addition, when the battery cells in at least one of the first battery module 101, the second battery module 102, the third battery module 103 and the fourth battery module 104 have thermal runaway, the fire-fighting component 30 can cool down and extinguish the battery cells in at least one of the first battery module 101, the second battery module 102, the third battery module 103 and the fourth battery module 104, thereby providing a relatively small number of fire-fighting components 30 to cool down and extinguish the first battery module 101, the second battery module 102, the third battery module 103 and the fourth battery module 104 at the same time.

[0141] The fire-fighting medium released by the shell 31 can cover the first battery module 101, the second battery module 102, the third battery module 103 and the fourth battery module 104 relatively quickly, which is conducive to cooling and extinguishing the first battery module 101, the second battery module 102, the third battery module 103 and the fourth battery module 104 at the same time relatively quickly.

[0142] The first battery module 101, the second battery module 102, the third battery module 103 and the fourth battery module 104 are all disposed in the liquid cooling element 20. The liquid cooling element 20 can simultaneously perform heat exchange with the first battery module 101, the second battery module 102, the third battery module 103 and the fourth battery module 104, thereby facilitating the improvement of heat dissipation efficiency.

[0143] In some examples, part of the housing 31 is located outside the receiving portion 21. Part of the housing 31 exceeds the receiving portion 21 and is located between the first battery module 101 and the second battery module 102. Part of the housing 31 exceeds the receiving portion 21 and is located between the third battery module 103 and the fourth battery module 104.

[0144] When the battery cell experiences thermal runaway, the temperature of the internal space of the battery pack 10 rises at a relatively fast rate. Therefore, the portion of the shell 31 outside the accommodating portion 21 can absorb more heat relatively quickly, so that the temperature of the portion of the shell 31 outside the accommodating portion 21 rises at a relatively fast rate, which is conducive to the temperature of the shell 31 reaching the first threshold relatively quickly, thereby improving the response rate of the fire protection component 30.

[0145] In some examples, the surface area of ​​the housing 31 outside the receiving portion 21 is greater than the surface area of ​​the housing 31 inside the receiving portion 21 .

[0146] For some examples, see Figures 6 to 9 As shown, the third battery module 103 includes a plurality of third battery cells 60. Each third battery cell 60 includes a third main body 61 and a third pressure relief portion 62. The fourth battery module 104 includes a plurality of fourth battery cells 70. Each fourth battery cell 70 includes a fourth main body 71 and a fourth pressure relief portion 72. The third pressure relief portion 62 is located on a side of the third main body 61 close to the fourth battery cell 70, and the fourth pressure relief portion 72 is located on a side of the fourth main body 71 close to the third battery cell 60. When the third battery cell 60 has thermal runaway, the third battery cell 60 can discharge high-temperature substances through the third pressure relief portion 62 to achieve pressure relief. When the fourth battery cell 70 has thermal runaway, the fourth battery cell 70 can discharge high-temperature substances through the fourth pressure relief portion 72 to achieve pressure relief.

[0147] In some embodiments, see Fig.13 As shown, viewed from a direction opposite to the first direction X, along the second direction Y, at least part of the third pressure relief portion 62 is located on one side of the housing 31 , and at least part of the fourth pressure relief portion 72 is located on the other side of the housing 31 .

[0148] The third pressure relief portion 62 and the fourth pressure relief portion 72 are respectively arranged on both sides of the fire-fighting part 30, and the distance between the third pressure relief portion 62 and the fourth pressure relief portion 72 and the fire-fighting part 30 is relatively small. The high-temperature substances discharged when at least one of the first pressure relief portion 42, the second pressure relief portion 52, the third pressure relief portion 62 and the fourth pressure relief portion 72 is relieved can act on the fire-fighting part 30 relatively directly and faster, so that the temperature of the shell 31 reaches the first threshold relatively quickly, so that the shell 31 can rupture and release the fire-fighting medium in a short time after the battery cell has thermal runaway, thereby improving the response rate of the fire-fighting part 30.

[0149] For some examples, see Fig.13As shown, among the multiple third pressure relief parts 62, a part of the third pressure relief parts 62 are located on one side of the fire-fighting part 30. Exemplarily, the multiple third battery cells 60 are arranged side by side along the third direction Z. Along the third direction Z, the third battery cells 60 closer to the middle area in the third battery module 103 have a greater probability of thermal runaway. In the third battery module 103, the third pressure relief parts 62 of some third battery cells 60 close to the middle area along the third direction Z are located on one side of the fire-fighting part 30. In the third battery module 103, some third battery cells 60 close to the edge area along the third direction Z may not be arranged opposite to the fire-fighting part 30.

[0150] In some examples, all of the third pressure relief portions 62 are located on one side of the fire protection element 30 .

[0151] For some examples, see Figure 8 As shown, among the plurality of fourth pressure relief parts 72, a part of the fourth pressure relief parts 72 are located on one side of the fire-fighting part 30. Exemplarily, the plurality of fourth battery cells 70 are arranged side by side along the third direction Z. Along the third direction Z, the fourth battery cells 70 closer to the middle area in the fourth battery module 104 have a greater probability of thermal runaway. In the fourth battery module 104, the fourth pressure relief parts 72 of some fourth battery cells 70 close to the middle area along the third direction Z are located on one side of the fire-fighting part 30. In the fourth battery module 104, some fourth battery cells 70 close to the edge area along the third direction Z may not be arranged opposite to the fire-fighting part 30.

[0152] In some examples, all of the fourth pressure relief portions 72 are located on one side of the fire protection element 30 .

[0153] In some examples, the third battery cell 60 is a square battery cell or a cylindrical battery cell, and the third pressure relief portion 62 is a pressure relief valve of the square battery cell or a pressure relief valve of the cylindrical battery cell.

[0154] In some examples, the fourth battery cell 70 is a square battery cell or a cylindrical battery cell, and the fourth pressure relief portion 72 is a pressure relief valve of the square battery cell or a pressure relief valve of the cylindrical battery cell.

[0155] In some examples, the plurality of third battery cells 60 may be connected in series, in parallel, or in mixed connection. Mixed connection means that the plurality of third battery cells 60 are connected in series and in parallel.

[0156] In some examples, the plurality of fourth battery cells 70 may be connected in series, in parallel, or in mixed connection. Mixed connection means that the plurality of fourth battery cells 70 are connected in series and in parallel.

[0157] In some examples, the third battery cell 60 includes two third electrode terminals 601 and at least one third sealing portion 602 . The third electrode terminal 601 extends out of the third sealing portion 602 . The third pressure relief portion 62 includes one third sealing portion 602 .

[0158] For some examples, see Figure 6 and Figure 7 As shown, the third battery cell 60 includes two third electrode terminals 601 and two third sealing parts 602. A third sealing part 602 is respectively provided on opposite sides of the third main body 61. One third electrode terminal 601 extends from one third sealing part 602, and another third electrode terminal 601 extends from another third sealing part 602. One third sealing part 602 is arranged opposite to the fire protection part 30, and the third pressure relief part 62 includes the third sealing part 602.

[0159] In some examples, the third battery cell 60 includes two third electrode terminals 601 and a third sealing portion 602. The two third electrode terminals 601 extend from one third sealing portion 602. The third sealing portion 602 is disposed opposite to the fire protection element 30.

[0160] In some examples, the fourth battery cell 70 includes two fourth electrode terminals 701 and at least one fourth sealing portion 702 . The fourth electrode terminal 701 extends out of the fourth sealing portion 702 . The third pressure relief portion 62 includes one fourth sealing portion 702 .

[0161] For some examples, see Figure 6 and Figure 7 As shown, the fourth battery cell 70 includes two fourth electrode terminals 701 and two fourth sealing parts 702. The fourth electrode terminals 701 extend out of the fourth sealing parts 702 respectively. One of the fourth sealing parts 702 is located on a side of the fourth main body 71 close to the third battery cell 60, and the fourth sealing part 702 is arranged opposite to the fire protection part 30, and each fourth pressure relief part 72 includes the fourth sealing part 702.

[0162] In some examples, the fourth battery cell 70 includes two fourth electrode terminals 701 and a fourth sealing portion 702. The two fourth electrode terminals 701 extend from one fourth sealing portion 702. The fourth sealing portion 702 is disposed opposite to the fire protection element 30.

[0163] In some embodiments, see Fig.13 As shown, viewed in the direction opposite to the first direction X, along the second direction Y, part of the housing 31 is located between the third sealing portion 602 and the fourth sealing portion 702 , wherein the third sealing portion 602 is the third pressure relief portion 62 , and the fourth sealing portion 702 is the fourth pressure relief portion 72 .

[0164] For some examples, see Figure 8As shown, the battery pack 10 includes a third thermally conductive adhesive 100. The third thermally conductive adhesive 100 bonds the third main body 61 and the liquid cooling member 20. The third thermally conductive adhesive 100 is arranged between the third main body 61 and the liquid cooling member 20, which is conducive to a relatively high heat exchange efficiency between the third main body 61 and the liquid cooling member 20. The thermal conductivity of the third thermally conductive adhesive 100 is 0.5W / (m·K) to 2.5W / (m·K). Exemplarily, the thermal conductivity of the third thermally conductive adhesive 100 is 1.0W / (m·K) to 2.5W / (m·K). For example, the thermal conductivity of the third thermally conductive adhesive 100 is 1.5W / (m·K), 1.8W / (m·K), and 2.0W / (m·K). Exemplarily, the third thermally conductive adhesive 100 includes but is not limited to thermally conductive silica gel.

[0165] Exemplarily, the third main body 61 is directly bonded to the liquid cooling member 20 through the third thermal conductive adhesive 100. Alternatively, the liquid cooling member 20 is a metal plate. An insulating sheet is provided on the liquid cooling member 20. The third main body 61 is bonded to the insulating sheet through the third thermal conductive adhesive 100.

[0166] In some examples, the battery pack 10 includes a fourth thermally conductive adhesive 110. The fourth thermally conductive adhesive 110 bonds the fourth main body 71 and the liquid cooling member 20. The fourth thermally conductive adhesive 110 is arranged between the fourth main body 71 and the liquid cooling member 20, which is conducive to a relatively high heat exchange efficiency between the fourth main body 71 and the liquid cooling member 20. The thermal conductivity of the fourth thermally conductive adhesive 110 is 0.5W / (m·K) to 2.5W / (m·K). Exemplarily, the thermal conductivity of the fourth thermally conductive adhesive 110 is 1.0W / (m·K) to 2.5W / (m·K). For example, the thermal conductivity of the fourth thermally conductive adhesive 110 is 1.5W / (m·K), 1.8W / (m·K), 2.0W / (m·K). Exemplarily, the fourth thermally conductive adhesive 110 includes but is not limited to thermally conductive silica gel.

[0167] Exemplarily, the fourth main body 71 is directly bonded to the liquid cooling member 20 through the fourth heat conductive adhesive 110. Alternatively, the liquid cooling member 20 is a metal plate. An insulating sheet is provided on the liquid cooling member 20. The fourth main body 71 is bonded to the insulating sheet through the fourth heat conductive adhesive 110.

[0168] In some examples, the third thermally conductive adhesive 100 bonds the third pressure relief portion 62 and the liquid cooling component 20, which is beneficial to fixing the position of the third pressure relief portion 62. The high-temperature substance sprayed from the third pressure relief portion 62 can act on the shell 31 relatively quickly, so as to facilitate the temperature of the shell 31 to reach the first threshold relatively quickly, thereby improving the response rate of the fire protection component 30.

[0169] For some examples, see Figure 2 and Figure 6As shown, the third thermally conductive adhesive 100 bonds the third sealing portion 602 and the liquid cooling element 20, which is conducive to fixing the position of the third sealing portion 602. When the battery cell undergoes thermal runaway, the third sealing portion 602 is not likely to change its pressure relief direction under the impact of the jet. The third sealing portion 602 is arranged opposite to the fire protection element 30.

[0170] In some examples, the fourth thermally conductive adhesive 110 bonds the fourth pressure relief portion 72 and the liquid cooling component 20, which is beneficial to fixing the position of the fourth pressure relief portion 72. The high-temperature substance sprayed from the fourth pressure relief portion 72 can act on the shell 31 relatively quickly, so as to facilitate the temperature of the shell 31 to reach the first threshold relatively quickly, thereby improving the response rate of the fire protection component 30.

[0171] For some examples, see Figure 2 and Figure 6 As shown, the fourth heat conductive adhesive 110 bonds the fourth sealing part 702 and the liquid cooling part 20. This is beneficial to fix the position of the fourth sealing part 702. When the battery cell is thermally runaway, the fourth sealing part 702 is not easy to change the pressure relief direction under the impact of the jet. The fourth sealing part 702 is arranged opposite to the fire protection part 30.

[0172] In some examples, at least one of the first battery cell 40 , the second battery cell 50 , the third battery cell 60 , and the fourth battery cell 70 is a soft-pack battery cell.

[0173] In some examples, the first battery cell 40 , the second battery cell 50 , the third battery cell 60 , and the fourth battery cell 70 are all soft-pack battery cells.

[0174] In some achievable ways, Fig.10 The partial structure of the battery pack 10 is schematically shown. Fig.10 As shown, the battery pack 10 includes a housing 120 and a pressure relief portion 130. The pressure relief portion 130 is disposed in the housing 120. The fire protection component 30 is disposed opposite to the pressure relief portion 130. The first battery module 101 and the liquid cooling component 20 are disposed in the housing 120. When the battery cell has thermal runaway, the pressure relief portion 130 is configured to open and release pressure in response to the internal pressure of the battery pack 10 reaching a threshold value, so as to reduce the possibility of explosion caused by the continuous increase of the internal pressure of the battery pack 10.

[0175] The shell 31 is configured such that when the temperature reaches a first threshold, the shell 31 ruptures to release a gaseous fire-fighting medium, the density of which is greater than the density of air. When the pressure relief portion 130 is opened, the gaseous fire-fighting medium can squeeze out the air in the battery pack 10 through the pressure relief portion 130, and a portion of the gaseous fire-fighting medium can also be discharged with the air. The fire-fighting medium discharged to the outside of the battery pack 10 can reduce the oxygen concentration around the pressure relief portion 130, thereby improving the safety of the battery pack 10.

[0176] In some examples, the first battery module 101, the second battery module 102, the third battery module 103, the fourth battery module 104, the fire protection component 30 and the liquid cooling component 20 are disposed in the housing 120. The battery management circuit board 10a is disposed outside the housing 120.

[0177] In some examples, the material of the housing 120 includes a metal material. For example, the material of the housing 120 may include, but is not limited to, steel, aluminum, or an aluminum alloy.

[0178] In some examples, the battery pack 10 includes a cover plate 140 (see Figure 2 140 is sealed to the housing 120. The cover plate 140 can open or close the opening of the housing 120. The cover plate 140 is sealed to the housing 120 to form a box with a sealed space. Exemplarily, the cover plate 140 is detachably connected to the housing 120. A sealing ring is provided between the cover plate 140 and the housing 120.

[0179] Exemplarily, the housing 120 includes a bottom plate and four side plates. The four side plates are connected end to end in sequence. The four side plates are connected to the bottom plate. The bottom plate and the four side plates enclose a receiving recess having an opening. The cover plate 140 can be sealed and connected to the four side plates. A pressure relief portion 130 is provided on one of the four side plates. For example, along the third direction Z, a pressure relief portion 130 is provided on one of the two opposite side plates. Along the third direction Z, the fire-fighting component 30 is arranged opposite to the pressure relief portion 130. The fire-fighting component 30 can be a tubular structure. The length direction of the fire-fighting component 30 is the same as the third direction Z.

[0180] In some examples, Fig.11 A partial structure of the battery pack 10 is schematically shown. Fig.12 The partial structure of the battery pack 10 is schematically shown. Fig.11 and Fig.12 As shown, the battery pack 10 includes two main electrodes 150 with opposite polarities. One of the two main electrodes 150 is a main positive electrode, and the other is a main negative electrode. The battery pack 10 outputs and inputs electrical energy through the two main electrodes 150. The two main electrodes 150 are located on the same side of the battery pack 10. The main electrodes 150 and the pressure relief portion 130 are respectively located on both sides of the battery pack 10.

[0181] The pressure relief direction of the pressure relief part 130 may be opposite to the main electrode 150. The distance between the main electrode 150 and the pressure relief part 130 is relatively large. When the pressure relief part 130 releases pressure, the possibility of structural damage to the main electrode 150 due to impact or high temperature is reduced.

[0182] Exemplarily, along the third direction Z, the two main electrodes 150 are located on the same side of the battery pack 10 . The main electrodes 150 and the pressure relief portion 130 are located on both sides of the battery pack 10 , respectively.

[0183] For some examples, see Fig.11 and Fig.12 As shown, the liquid cooling element 20 includes an inlet 201 and an outlet 202. The cooling medium can be input into the liquid cooling element 20 through the inlet 201. The temperature of the cooling medium increases after heat exchange with the battery module in the liquid cooling element 20. The cooling medium with increased temperature is discharged from the liquid cooling element 20 through the outlet 202. The inlet 201 and the outlet 202 of the liquid cooling element 20 are located on the same side of the battery pack 10, and the inlet 201 of the liquid cooling element 20 and the pressure relief portion 130 are respectively located on both sides of the battery pack 10.

[0184] The pressure relief direction of the pressure relief part 130 can be away from the inlet 201 and the outlet 202 of the liquid cooling part 20. The distance between the inlet 201 and the outlet 202 of the liquid cooling part 20 and the pressure relief part 130 is relatively large. When the pressure relief part 130 releases pressure, the possibility of structural damage to the inlet 201 and the outlet 202 of the liquid cooling part 20 due to impact or high temperature is reduced, so that in the case of thermal runaway of the battery cell, the liquid cooling part 20 can still circulate the cooling medium normally to cool down the battery pack 10 as a whole.

[0185] According to some embodiments of the present application, an electric device is further provided, comprising a battery pack 10 according to any of the above schemes, and the battery pack 10 is used to provide electric energy to the electric device.

[0186] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; 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, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery pack, characterized in that: include: A liquid cooling member having a receiving portion; A first battery module is disposed on the liquid cooling member, wherein the first battery module is spaced apart from the accommodation portion; A fire-fighting component, at least part of which is arranged in the accommodating portion and exposed in the accommodating portion, wherein the fire-fighting component comprises a shell and a fire-fighting medium, wherein the fire-fighting medium is arranged in the shell, and the shell is configured such that when the temperature reaches a first threshold, the shell ruptures to release the fire-fighting medium, and the range of the first threshold is 70°C-200°C.

2. The battery pack according to claim 1, characterized in that: Along a first direction, the liquid cooling member includes a first side and a second side opposite to each other; The battery pack includes a second battery module, the first battery module and the second battery module are arranged on a first side of the liquid cooling element, and along a second direction, the first battery module and the second battery module are arranged at intervals; Observed along the first direction, along the second direction, the first battery module and the second battery module are located on both sides of the housing, and the first direction is perpendicular to the second direction.

3. The battery pack according to claim 2, characterized in that: Part of the shell is located outside the accommodating portion, and part of the shell is located between the first battery module and the second battery module.

4. The battery pack according to claim 2 or 3, characterized in that: The first battery module includes a plurality of first battery cells, each of which includes a first main body and a first pressure relief portion; The second battery module includes a plurality of second battery cells, the second battery cells include a second main body and a second pressure relief portion, the first pressure relief portion is located on a side of the first main body close to the second battery cell, and the second pressure relief portion is located on a side of the second main body close to the first battery cell; Observing along the first direction, along the second direction, at least a portion of the first pressure relief portion is located on one side of the housing, and at least a portion of the second pressure relief portion is located on the other side of the housing.

5. The battery pack according to claim 4, characterized in that: The first battery cell includes two first electrode terminals and at least one first sealing portion, the first electrode terminal extends out of the first sealing portion, and each of the first pressure relief portions includes one first sealing portion; The second battery cell includes two second electrode terminals and at least one second sealing portion, the second electrode terminal extends out of the second sealing portion, and each second pressure relief portion includes one second sealing portion.

6. The battery pack according to claim 4 or 5, characterized in that: The battery pack includes a first thermally conductive adhesive and a second thermally conductive adhesive, the first thermally conductive adhesive is bonded to the first main body and the liquid cooling component, and the thermal conductivity of the first thermally conductive adhesive is 0.5-2.5 W / (m·K); The second heat-conductive adhesive bonds the second main body and the liquid cooling component, and the thermal conductivity of the second heat-conductive adhesive is 0.5-2.5 W / (m·K).

7. The battery pack according to claim 6, characterized in that: The first heat-conductive adhesive is bonded to the first pressure relief portion and the liquid cooling component, and the second heat-conductive adhesive is bonded to the second pressure relief portion and the liquid cooling component.

8. The battery pack according to any one of claims 3 to 7, characterized in that: The battery pack includes a third battery module and a fourth battery module, and the third battery module and the fourth battery module are arranged on the second side of the liquid cooling member; The receiving portion passes through the liquid cooling member, Viewed from a direction opposite to the first direction, along the second direction, the third battery module and the fourth battery module are located on both sides of the housing.

9. The battery pack according to claim 8, characterized in that: The third battery module includes a plurality of third battery cells, each of which includes a third main body and a third pressure relief portion. The fourth battery module includes a plurality of fourth battery cells, each of the fourth battery cells includes a fourth main body and a fourth pressure relief portion, the third pressure relief portion is located on a side of the third main body close to the fourth battery cell, and the fourth pressure relief portion is located on a side of the fourth main body of the third battery cell; Viewed from a direction opposite to the first direction, along the second direction, at least a portion of the third pressure relief portion is located on one side of the housing, and at least a portion of the fourth pressure relief portion is located on the other side of the housing.

10. The battery pack according to claim 9, characterized in that: The battery pack includes a third thermally conductive adhesive and a fourth thermally conductive adhesive, the third thermally conductive adhesive is bonded to the third main body and the liquid cooling component, and the thermal conductivity of the third thermally conductive adhesive is 0.5-2.5W / (m·K); the fourth thermally conductive adhesive is bonded to the fourth main body and the liquid cooling component, and the thermal conductivity of the fourth thermally conductive adhesive is 0.5-2.5W / (m·K).

11. The battery pack according to any one of claims 1 to 10, characterized in that: The battery pack includes a battery management circuit board, The fire-fighting component includes a wire connected to the battery management circuit board. The fire-fighting component includes a detection component configured to detect whether the fire-fighting component is broken and transmit a signal to the battery management circuit board through the wire.

12. The battery pack according to any one of claims 1 to 11, characterized in that: The first threshold of the housing is greater than the boiling point of the fire-fighting medium.

13. An electrical equipment, characterized in that: A battery pack comprising the battery pack according to any one of claims 1 to 12.

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