Battery device and electric equipment with same

Abstract

The invention discloses a battery device and electric equipment with the battery device, and the battery device comprises a shell which defines a containing cavity; the battery pack is arranged in the accommodating cavity, the battery pack comprises a plurality of battery monomers arranged along the first direction, and each battery monomer is provided with a tab lead-out sheet; and each battery monomer is provided with the first heat absorption piece, and the first heat absorption piece corresponding to each battery monomer extends to the tab lead-out piece so as to exchange heat with the tab lead-out piece. According to the battery device disclosed by the embodiment of the invention, each battery monomer is provided with the first heat absorption piece, and the first heat absorption piece can be used for blocking heat transfer between the adjacent battery monomers and absorbing heat on the tab lead-out piece, so that the tab lead-out piece is prevented from further transferring the heat into the battery monomers; and therefore, thermal runaway of adjacent battery monomers caused by high-temperature flames erupted by the thermal runaway battery monomers can be prevented, the thermal diffusion speed of the battery monomers can be delayed, and more escape time can be conveniently strived for people.

Description

Technical Field

[0001] This invention relates to the field of battery device technology, and more specifically, to a battery device and an electrical appliance having the same. Background Technology

[0002] Batteries in related technologies are prone to thermal runaway due to water immersion, short circuits, overcharging, high temperatures, mechanical impacts, or human operation and abuse, which can lead to large-scale combustion or explosion inside the battery pack, seriously threatening people's lives and property. Therefore, how to set up a structure to delay the spread of heat in the event of thermal runaway has become an important measure to improve battery safety and can buy more time for users to escape. Summary of the Invention

[0003] This invention aims to at least solve one of the technical problems existing in the prior art. To this end, this invention proposes a battery device in which each battery cell is equipped with a first heat-absorbing element. The first heat-absorbing element can block heat transfer between adjacent battery cells, absorb heat from the electrode leads, and prevent the electrode leads from further transferring heat into the battery cell. This can prevent the high-temperature flames emitted by the thermally runaway battery cell from causing thermal runaway of adjacent battery cells, thereby improving the safety of the battery device, slowing down the rate of heat diffusion from the battery cells, and providing more time for personnel to escape.

[0004] The present invention also proposes an electrical device having the aforementioned battery device.

[0005] According to a first aspect of the present invention, a battery device includes: a housing defining a receiving cavity; a battery pack disposed within the receiving cavity, the battery pack including a plurality of battery cells arranged along a first direction, each battery cell having a tab lead-out piece; and a first heat-absorbing element, each battery cell having a first heat-absorbing element, the first heat-absorbing element corresponding to each battery cell extending to the tab lead-out piece for heat exchange with the tab lead-out piece.

[0006] According to the battery device of the present invention, by providing a first heat-absorbing element for each battery cell, the first heat-absorbing element can block heat transfer between adjacent battery cells, absorb heat from the tab lead-out sheet, and prevent the tab lead-out sheet from further transferring heat to the battery cell. This can prevent the high-temperature flames emitted by the thermally runaway battery cell from causing thermal runaway of adjacent battery cells, thereby improving the safety of the battery device, slowing down the rate of heat diffusion from the battery cell, and providing more time for personnel to escape.

[0007] In addition, the battery device according to the above embodiments of the present invention may also have the following additional technical features: According to some embodiments of the present invention, each of the battery cells is provided with the first heat-absorbing element on both sides of the first direction.

[0008] According to some optional embodiments of the present invention, the two first heat-absorbing elements corresponding to the battery cell cooperate to define a placement cavity, the battery cell is located in the placement cavity, and the electrode lead-out piece extends out of the placement cavity; and / or, the electrode lead-out piece is located on one side of the battery cell in a second direction, the side of the battery cell in the first direction is the side with the largest area, the first heat-absorbing element covers at least a portion of the side of the battery cell in the first direction, at least a portion of the side of the battery cell in the second direction, and at least a portion of the electrode lead-out piece, the first direction and the second direction intersect.

[0009] According to some embodiments of the present invention, a partition cavity is provided between the battery pack and the outer casing, and a second heat-absorbing element is provided in the partition cavity, the second heat-absorbing element being disposed on at least one wall of the partition cavity.

[0010] According to some alternative embodiments of the present invention, the separator cavity is located on one side of the battery pack in a second direction, the first direction and the second direction are perpendicular, and the tab lead-out piece is located inside the separator cavity.

[0011] According to some specific embodiments of the present invention, the outer casing includes a first side beam, a top cover, and a bottom plate. The first side beam is spaced apart from the battery pack in a second direction. In a third direction, the top cover and the bottom plate are opposite to each other. The battery pack is disposed between the bottom plate and the top cover. The top cover and the bottom plate are respectively connected to the first side beam to form the partition cavity between them and the end of the battery pack. At least one of the bottom plate, the top cover, and the first side beam is provided with a second heat-absorbing element. The first direction, the second direction, and the third direction are perpendicular to each other.

[0012] In some embodiments, the base plate has a flow channel, the base plate exchanges heat with the battery pack, and the second heat-absorbing element is provided on the side of the base plate facing the top cover; and / or, the battery device further includes a bottom protective plate, the bottom protective plate being disposed on the side of the base plate opposite to the battery pack; and / or, the battery pack includes a plurality of electrical connecting pieces, the plurality of electrical connecting pieces being electrically connected to a plurality of electrode lead-out pieces, the electrode lead-out pieces extending to the side of the electrical connecting pieces opposite to the battery cell to be electrically connected to the electrical connecting pieces.

[0013] In some embodiments, the base plate has a flow channel inside, the base plate exchanges heat with the battery pack, the first side beam has a second heat-absorbing element on the side facing the battery pack, the first side beam has a mating hole, the second heat-absorbing element has a clearance hole, and the cooling connector is adapted to connect with the flow channel inside the base plate through the mating hole and the clearance hole.

[0014] According to some optional embodiments of the present invention, the first heat-absorbing element includes a first encapsulation film and a first heat-absorbing material, wherein the first encapsulation film encapsulates the first heat-absorbing material; the second heat-absorbing element includes a second encapsulation film and a second heat-absorbing material, wherein the second encapsulation film encapsulates the second heat-absorbing material; wherein the first heat-absorbing material includes a hydrogel or an inorganic hydrated salt; and / or the second heat-absorbing material includes a hydrogel or an inorganic hydrated salt; and / or the first heat-absorbing material satisfies , This represents the amount of heat absorbed per unit area by the first heat-absorbing material. The unit is kJ / m 2 , The combustion time of the thermal runaway of the battery cell; and / or the second heat-absorbing material satisfies , This represents the heat absorption per unit area of ​​the second heat-absorbing material. The unit is kJ / m 2 , The time of thermal runaway of the battery cell is the combustion time.

[0015] According to some embodiments of the present invention, the outer casing includes a frame, a cooling cavity is provided inside the frame, the frame is provided with a connecting hole, the cooling cavity is connected to the receiving cavity through the connecting hole, and the frame is provided with a pressure relief component that opens under set conditions to release gas, when the pressure relief component is opened, the gas in the cooling cavity is discharged from the pressure relief component.

[0016] According to some optional embodiments of the present invention, the frame includes an intersecting first side beam and a second side beam, the second side beam having the communicating hole and the cooling cavity, the first side beam having a pressure relief cavity communicating with the cooling cavity, and the pressure relief cavity having the pressure relief component.

[0017] According to some optional embodiments of the present invention, the cooling cavity is provided with a plurality of partitions, the plurality of partitions being arranged parallel to each other along a second direction, the second direction being perpendicular to the first direction, the plurality of partitions including at least two first partitions, the cooling cavity including a first wall and a second wall arranged opposite to each other in the second direction, one end of one of two adjacent first partitions being connected to the first wall and the other end being spaced apart from the second wall, and one end of the other of two adjacent first partitions being spaced apart from the first wall and the other end being connected to the second wall, so as to divide the cooling cavity into a plurality of interconnected and tortuous cooling channels.

[0018] According to some specific embodiments of the present invention, the plurality of partitions further includes a second partition, the two ends of which are spaced apart from the first wall and the second wall, respectively. The second partition is provided between at least two of the first partitions, and / or the second partition is provided between the first partition and the top wall of the cooling cavity, and / or the second partition is provided between the first partition and the bottom wall of the cooling cavity.

[0019] According to some specific embodiments of the present invention, the partition is adapted to exchange heat with the gas in the cooling chamber; and / or the thickness of the partition is in the range of 0.5mm-1.5mm; and / or the minimum distance between adjacent partitions is in the range of 3mm-6mm.

[0020] According to a second aspect of the present invention, an electrical device is provided, the electrical device comprising the battery device described in the first aspect of the present invention.

[0021] According to the embodiments of the present invention, the electrical equipment utilizes the battery device described in the first aspect of the present invention. By providing a first heat-absorbing element for each battery cell, the first heat-absorbing element can block heat transfer between adjacent battery cells, absorb heat from the tab lead-out sheet, and prevent the tab lead-out sheet from further transferring heat to the battery cell. This can prevent the high-temperature flames emitted by the thermally runaway battery cell from causing thermal runaway of adjacent battery cells, thereby improving the safety of the battery device and slowing down the rate of heat diffusion from the battery cell, thus providing more time for personnel to escape.

[0022] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0023] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1This is an exploded view of the structure of a battery device according to an embodiment of the present invention; Figure 2 This is a partial structural schematic diagram of a battery device according to an embodiment of the present invention; Figure 3 yes Figure 2 Enlarged view of point A in the middle; Figure 4 This is a front view of the border according to an embodiment of the present invention; Figure 5 yes Figure 4 Sectional view at point BB; Figure 6 This is a cross-sectional view of the second side beam according to an embodiment of the present invention.

[0024] Reference numerals: 1. Battery assembly; 10. Outer shell; 101. Receiving cavity; 102. Separating cavity; 100. Frame; 11. First side beam; 111. Pressure relief cavity; 112. Mating hole; 12. Second side beam; 121. Cooling cavity; 1211. Cooling flow channel; 1212. First wall; 1213. Second wall; 122. Connecting hole; 13. Top cover; 14. Bottom protective plate; 151. First partition; 152. Second partition; 20. Battery pack; 21. Battery cell; 211. Terminal tab; 22. Electrical connection assembly; 221. Electrical connection piece; 40. First heat-absorbing element; 50. Second heat-absorbing element; 51. Clearance hole; 61. Base plate; 62. Pressure relief component; 63. Cooling connector. Detailed Implementation

[0025] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0026] The battery device 1 according to an embodiment of the present invention is described below with reference to the accompanying drawings.

[0027] like Figures 1-3 As shown, the battery device 1 according to an embodiment of the present invention includes a housing 10, a battery pack 20, and a first heat-absorbing element 40.

[0028] The outer casing 10 defines a receiving cavity 101, and the battery pack 20 is disposed in the receiving cavity 101. The battery pack 20 includes a plurality of battery cells 21 arranged along a first direction. Each battery cell 21 is provided with a tab lead-out piece 211 and a first heat-absorbing element 40. The first heat-absorbing element 40 corresponding to each battery cell 21 extends to the tab lead-out piece 211 to exchange heat with the tab lead-out piece 211.

[0029] The first heat-absorbing element 40 is used to absorb the heat generated by the battery cell 21 and the tab lead-out piece 211, thereby isolating the heat transfer between adjacent battery cells 21 and preventing heat transfer between adjacent battery cells 21. In this way, when one of the battery cells 21 experiences thermal runaway, it can prevent the high-temperature flame emitted by the thermally runaway battery cell 21 from causing thermal runaway of adjacent battery cells 21.

[0030] Specifically, the first heat-absorbing element 40 covers the side of the battery cell 21 in the first direction, which can significantly reduce the impact of flame radiation on the side of the battery cell 21. The first heat-absorbing element 40 extends to the tab lead-out piece 211 to exchange heat with the tab lead-out piece 211. In this way, the first heat-absorbing element 40 can absorb the heat of the tab lead-out piece 211 to prevent the tab lead-out piece 211 from further transferring heat into the battery cell 21.

[0031] Meanwhile, based on the material properties of the first heat absorber 40, the water vapor generated after the first heat absorber 40 absorbs heat can reduce the flame temperature.

[0032] In some embodiments, multiple tabs 211 are adapted to be electrically connected by multiple electrical connectors 221. When one of the multiple battery cells 21 experiences thermal runaway, a flame is generated inside the battery device 1. The flame can easily heat the electrical connectors 221. By covering at least a portion of the tabs 211 of the battery cell 21 with a first heat absorber 40, the first heat absorber 40 can absorb the heat from the tabs 211, thereby absorbing the heat transferred from the electrical connectors 221 to the battery cell 21 and preventing the tabs 211 from further transferring heat into the battery cell 21.

[0033] In some embodiments, considering the influence of heat transfer from the flame emitted by the thermally runaway battery cell 21, a thermal runaway simulation is performed on the battery device 1. The simulation results show that the temperature of the adjacent normal battery cell 21 on the first direction side rises rapidly to 187°C within 5 seconds, and thermal diffusion occurs. This indicates that in the case of thermal runaway and combustion of the battery cell 21, it is crucial to protect the first direction side of the battery cell 21 from the influence of flame heat transfer.

[0034] Furthermore, the first heat-absorbing element 40 is a heat-absorbing material, which can be an inorganic hydrated salt, hydrogel, or other similar material.

[0035] Adjacent battery cells 21 are separated by a heat-absorbing material, which extends to the tab lead-out piece 211 and covers the side of the battery cell 21 and at least part of the tab lead-out piece 211. The heat-absorbing material can absorb heat and block the conduction of heat during thermal runaway. On the other hand, the water vapor generated after the heat-absorbing material absorbs heat can cool the flame and dilute the concentration of combustible gas. Specifically, the water vapor formed after the heat-absorbing material undergoes a phase change due to heat can reduce the flame temperature.

[0036] Specifically, by attaching the heat-absorbing material tightly to the side of the battery cell 21, thermal runaway on the side of the battery cell 21 caused by fire radiation can be prevented. Covering at least part of the tab lead 211 with the heat-absorbing material can absorb the heat transferred from the electrical connection piece 221, thereby preventing the tab lead 211 from further transferring heat into the battery cell 21.

[0037] Furthermore, in the event of thermal runaway of the battery cell 21, the flame emitted by the battery cell 21 will heat the electrical connector 221. The electrical connector 221 will heat the tab lead 211 through heat conduction, thereby heating the inside of the battery cell 21 and inducing thermal runaway. Covering part of the tab lead 211 with heat-absorbing material can absorb the heat conducted by the electrical connector 221, so as to prevent the heat on the electrical connector 221 from inducing thermal runaway of the battery cell 21 through the tab lead 211.

[0038] In summary, according to the battery device 1 of the present invention, by providing a first heat-absorbing element 40 for each battery cell 21, the first heat-absorbing element 40 can block heat transfer between adjacent battery cells 21, absorb heat on the tab lead-out piece 211, and prevent the tab lead-out piece 211 from further transferring heat to the inside of the battery cell 21. This can prevent the high-temperature flames emitted by the thermally runaway battery cell 21 from causing thermal runaway of adjacent battery cells 21, thereby improving the safety of the battery device 1 and slowing down the rate of heat diffusion of the battery cell 21, thus providing more time for personnel to escape.

[0039] The battery device 1 according to a specific embodiment of the present invention is described below with reference to the accompanying drawings.

[0040] In some specific embodiments of the present invention, such as Figures 1-3 As shown, the battery device 1 includes a housing 10, a battery pack 20, and a first heat-absorbing element 40.

[0041] In some embodiments of the present invention, the first heat-absorbing element 40 is adhesively bonded to the battery cell 21.

[0042] In some embodiments of the present invention, such as Figure 3As shown, each battery cell 21 is provided with a first heat-absorbing element 40 on both sides in the first direction, so as to separate two adjacent battery cells 21 by using two first heat-absorbing elements 40, thereby further reducing the possibility of thermal runaway of adjacent battery cells 21 caused by the high-temperature flames emitted by the thermal runaway battery cell 21.

[0043] At the same time, the two first heat-absorbing elements 40 simultaneously absorb the heat on the tab lead-out piece 211 to fully prevent the possibility of the tab lead-out piece 211 transferring heat to the inside of the battery cell 21, thereby reducing the possibility that the heat on the tab lead-out piece 211 may induce thermal runaway of the battery cell 21.

[0044] Specifically, the high-temperature gas or flame generated by thermal runaway will heat the tab lead 211, thereby conducting heat to the inside of the battery cell 21 and inducing the normal battery cell 21 to run away. The first heat-absorbing element 40 on both sides of each battery cell 21 can absorb the heat from the tab lead 211, so as to fully reduce the possibility that the heat on the tab lead 211 will induce thermal runaway of the battery cell 21.

[0045] Furthermore, the first heat-absorbing element 40 is made of heat-absorbing material. By providing heat-absorbing material on both sides of each battery and covering the two sides of the battery cell 21 in the first direction and the tab lead-out piece 211, the impact of the jet flame from thermal runaway on the normal battery cell 21 can be reduced.

[0046] In some alternative embodiments of the present invention, such as Figure 1 As shown, the tab lead-out piece 211 is located on one side of the battery cell 21 in the second direction. The side of the battery cell 21 in the first direction is the side with the largest area. The first heat-absorbing member 40 covers the side of the battery cell 21 in the first direction, covers at least a portion of the side of the battery cell 21 in the second direction, and covers at least a portion of the tab lead-out piece 211. The first direction and the second direction intersect.

[0047] The first heat-absorbing element 40 has two ends along its length that are adapted to be bent to fit against at least a portion of the side surface of the battery cell 21 in the second direction. Specifically, a first portion of the first heat-absorbing element 40 covers the side surface of the battery cell 21 in the first direction, a second portion of the first heat-absorbing element 40 is bent relative to the first portion and covers at least a portion of the side surface of the battery cell 21 in the second direction, and a third portion of the first heat-absorbing element 40 extends in the same direction as the first portion and covers at least a portion of the tab lead-out piece 211, so as to fully absorb the heat on the battery cell 21 by utilizing the first heat-absorbing element 40, thereby improving the heat absorption efficiency of the first heat-absorbing element 40.

[0048] In some alternative embodiments of the present invention, such as Figure 3As shown, the two first heat-absorbing elements 40 corresponding to the battery cell 21 cooperate to define the placement cavity. The battery cell 21 is located in the placement cavity, and the tab lead-out piece 211 extends out of the placement cavity. The placement cavity is defined by the two first heat-absorbing elements 40 to fully wrap the battery cell 21 and isolate the heat transfer between two adjacent battery cells 21 from all directions, thereby further reducing the possibility that the high-temperature flame emitted by the thermal runaway battery cell 21 will cause thermal runaway of adjacent battery cells 21.

[0049] In some embodiments, such as Figure 3 As shown, the middle portion of the first heat-absorbing element 40 protrudes to define a placement cavity between the two first heat-absorbing elements 40. At the same time, the protruding middle portion of the first heat-absorbing element 40 is adapted to be in contact with the side wall of the battery cell 21 in the first direction to fully absorb the heat generated by the battery cell 21, thereby isolating the heat transfer between two adjacent battery cells 21.

[0050] The edges of the two first heat-absorbing elements 40 are located on both sides of the tab in the first direction and are in contact with at least part of the tab lead-out piece 211 to fully absorb the heat on the tab lead-out piece 211 and reduce the possibility that the heat on the tab lead-out piece 211 may induce thermal runaway of the battery cell 21.

[0051] In some embodiments, the electrical connector 221 is adapted to electrically connect the tab lead 211 of the battery cell 21 extending out of the placement cavity, so as to connect multiple battery cells 21 in series or in parallel.

[0052] In some embodiments of the present invention, such as Figure 2 , Figure 3 As shown, a partition cavity 102 is provided between the battery pack 20 and the outer casing 10. A second heat-absorbing element 50 is provided in the partition cavity 102. The second heat-absorbing element 50 is provided on at least one wall of the partition cavity 102. The second heat-absorbing element 50 can absorb the heat in the partition cavity 102 to prevent the outer casing 10 of the battery device 1 from being blown through by the flame, causing an open flame to appear outside the battery device 1.

[0053] Specifically, the first heat-absorbing element 40 is used to prevent the high-temperature flames emitted by the thermally runaway battery cell 21 from causing thermal runaway of adjacent battery cells 21, so as to control the degree of thermal runaway of the battery pack 20 when one battery cell 21 thermally runs away, and avoid one thermally runaway battery cell 21 causing more normal battery cells 21 to thermally run away.

[0054] For battery cell 21 that inevitably undergoes thermal runaway and flameout, its flames will quickly fill the inner cavity of battery device 1 and spread into the partition cavity 102. At this time, the non-flammable gas generated by the small amount of first heat absorber 40 is not enough to extinguish the fire quickly. Therefore, a second heat absorber 50 is installed on the inner wall of partition cavity 102 to prevent the flames from penetrating the outer shell 10 of battery device 1 in the event that the fire cannot be extinguished, to prevent open flames from appearing outside battery device 1, and to prevent the flames in battery device 1 from causing greater danger.

[0055] In some embodiments, such as Figure 2 As shown, the battery pack 20 is spaced apart from the outer casing 10 at both ends in the second direction. The battery pack 20 has a partition cavity 102 at each end in the second direction. A second heat-absorbing element 50 is provided in each partition cavity 102. The second heat-absorbing element 50 is provided on at least one wall of the partition cavity 102.

[0056] In some embodiments, based on the material properties of the second heat absorber 50, the water vapor generated after the second heat absorber 50 absorbs heat can reduce the flame temperature. Specifically, the water vapor formed after the heat-absorbing material undergoes a phase change due to heat can reduce the flame temperature.

[0057] In some alternative embodiments of the present invention, the second heat-absorbing element 50 is adhesively bonded to the wall of the partition cavity 102.

[0058] In some alternative embodiments of the present invention, such as Figure 2 , Figure 3 As shown, the separator cavity 102 is located on one side of the battery pack 20 in the second direction, and the first and second directions are perpendicular. The tab lead-out piece 211 is located in the separator cavity 102. Part of the second heat-absorbing element 50 in the separator cavity 102 can absorb the heat on the tab lead-out piece 211, thereby reducing the heat transferred to the battery cell 21. Reducing the heat on the tab lead-out piece 211 may induce thermal runaway of the battery cell 21.

[0059] In some embodiments, the portion of the tab lead 211 extending out of the placement cavity is located within the partition cavity 102. Specifically, the first heat-absorbing member 40 is attached to a portion of the tab lead 211, and the other portion of the tab lead 211 is located within the partition cavity 102. This allows the first heat-absorbing member 40 and the second heat-absorbing member 50 to absorb heat from the tab lead 211 together, thereby significantly reducing the heat transferred to the battery cell 21 and minimizing the possibility that the heat on the tab lead 211 may induce thermal runaway in the battery cell 21.

[0060] In some examples, multiple tabs 211 are adapted to be electrically connected by multiple electrical connectors 221 located within the partition cavity 102. When one of the multiple battery cells 21 experiences thermal runaway, a flame is generated within the battery device 1. The flame easily heats the electrical connectors 221. The second heat absorber 50 can absorb the heat on the electrical connectors 221, thereby absorbing the heat transferred from the electrical connectors 221 to the battery cells 21 and preventing the tabs 211 from further transferring heat into the battery cells 21.

[0061] In some specific embodiments of the present invention, such as Figure 1 , Figure 2 As shown, the outer casing 10 includes a first side beam 11, a top cover 13, and a bottom plate 61. The first side beam 11 is spaced apart from the battery pack 20 in the second direction. In the third direction, the top cover 13 and the bottom plate 61 are arranged opposite to each other. The battery pack 20 is disposed between the bottom plate 61 and the top cover 13. The top cover 13 and the bottom plate 61 are respectively connected to the first side beam 11 to define a partition cavity 102 between them and the end of the battery pack 20. At least one of the bottom plate 61, the top cover 13, and the first side beam 11 is provided with a second heat-absorbing element 50. The first direction, the second direction, and the third direction are perpendicular to each other.

[0062] The second heat-absorbing element 50, which is provided on the bottom plate 61, the top cover 13 or the first side beam 11, can absorb the heat of the flame in the partition cavity 102 to prevent the bottom plate 61, the top cover 13 or the first side beam 11 from being blown through by the flame, thereby preventing open flames from appearing outside the battery device 1.

[0063] Specifically, since the inner wall of the first side beam 11, the lower surface of the top cover 13, or the upper surface of the bottom plate 61 has a second heat-absorbing element 50, the water vapor formed after the phase change of the second heat-absorbing element 50 can reduce the flame temperature, thereby preventing the flame temperature from being too high and causing the end of the normal battery cell 21 to be affected by the heat transfer of the flame and thus causing thermal runaway. The heat absorbed by the second heat-absorbing element 50 can reduce the heat of the outer shell 10 of the battery device 1, thereby preventing the outer shell 10 from being burned through by the flame and avoiding open flames outside the battery device 1.

[0064] It is understandable that the second heat-absorbing element 50 laid on the inner wall of the first side beam 11, the lower surface of the top cover 13, or the upper surface of the bottom plate 61 can also be replaced with a fire extinguishing blanket. The fire extinguishing blanket is a fabric made of materials such as glass fiber that has undergone special treatment. It can isolate heat sources and flames. Although it cannot absorb heat, it can still prevent open flames from appearing outside the battery device 1. This will not be elaborated on here.

[0065] In some embodiments, the inner wall of the first side beam 11, the lower surface of the top cover 13, and the upper surface of the bottom plate 61 are all covered with a second heat-absorbing element 50 to provide comprehensive protection for the flames in the partition cavity 102 and prevent the flames from thermally runaway from penetrating the first side beam 11, the top cover 13, and the bottom plate 61.

[0066] Specifically, for the battery cell 21 that inevitably undergoes thermal runaway and combustion, its flames will quickly fill the inner cavity of the battery device 1. At this time, the non-combustible gas generated by only a small amount of the first heat absorber 40 and the second heat absorber 50 cannot extinguish the fire quickly. Therefore, the second heat absorber 50 is laid on the inner wall of the first side beam 11, the lower surface of the top cover 13 and the upper surface of the bottom plate 61, which can prevent the flames from penetrating the first side beam 11, the top cover 13 and the bottom plate 61 when the fire cannot be extinguished.

[0067] Understandably, the first heat-absorbing element 40 can prevent heat diffusion, thus limiting the flame combustion time and making it possible to use a limited second heat-absorbing element 50 to protect the first side beam 11, top cover 13, and bottom plate 61. Without the first heat-absorbing element 40, heat diffusion would occur in the battery device 1, greatly extending the combustion time. In this case, the limited second heat-absorbing element 50 would no longer be able to provide effective protection for the battery device 1.

[0068] In some embodiments, the second heat-absorbing element 50 includes a second heat-absorbing material and a second encapsulation film. The second encapsulation film wraps the second heat-absorbing material. The second heat-absorbing material can be an inorganic hydrated salt, hydrogel, or other material. The second heat-absorbing element 50 covers the inner wall of the partition cavity 102 before and after the phase change, thereby ensuring that the first side beam 11, the top cover 13, and the bottom plate 61 are always protected by the second heat-absorbing material.

[0069] Specifically, the second heat-absorbing material is in a gel-like or solid state before the phase change. After the second encapsulation film on the surface of the second heat-absorbing element 50 is broken, the second heat-absorbing material will not flow out, which is intended to protect the first side beam 11, top cover 13 and bottom plate 61 of the battery device 1 from being penetrated by the flame.

[0070] In some examples, both the first heat-absorbing element 40 and the second heat-absorbing element 50 include an encapsulation film and a heat-absorbing material. The heat-absorbing material can have its mechanical properties enhanced by a framework. The heat-absorbing material is in a gel-like or solid state below 80°C, thus ensuring that the heat-absorbing material can effectively protect critical parts. However, if the heat-absorbing material is liquid, the heat-absorbing material will leak out after the encapsulation film melts at high temperatures, failing to provide effective protection.

[0071] In some embodiments, such as Figure 1 As shown, the bottom plate 61 has a flow channel inside, and the bottom plate 61 exchanges heat with the battery pack 20. The bottom plate 61 has a second heat-absorbing element 50 on the side facing the top cover 13.

[0072] Specifically, the base plate 61 is provided with flow channels for cooling the battery pack 20 so that the battery pack 20 can operate at a suitable temperature, which facilitates the improvement of the charging and discharging efficiency of the battery device 1.

[0073] In some embodiments, the battery device 1 further includes a bottom protective plate 14, which is disposed on the side of the bottom plate 61 away from the battery pack 20. The bottom protective plate 14 is used to strengthen the strength of the outer casing 10, thereby providing better load-bearing capacity for the battery pack 20 inside the receiving cavity 101.

[0074] The bottom plate 61 is located on the side of the bottom protective plate 14 facing the top cover 13, and the second heat-absorbing element 50 is located on the bottom plate 61 to cover the lower surface of the partition cavity 102.

[0075] In some embodiments, such as Figure 3 As shown, the battery pack 20 includes an electrical connection assembly 22, which includes multiple electrical connection pieces 221. The multiple electrical connection pieces 221 are electrically connected to the tabs 211 of multiple battery cells 21. The tabs 211 extend to the side of the electrical connection piece 221 away from the battery cell 21, so as to be electrically connected to the electrical connection piece 221. The multiple electrical connection pieces 221 can be used to realize the series or parallel connection of multiple battery cells 21.

[0076] In some embodiments, the tab lead 211 extends to the side of the electrical connector 221 opposite to the battery cell 21 and is adapted to be bent so that a portion of the tab lead 211 fits against the sidewall of the electrical connector 221, thereby improving the connection strength between the tab lead 211 and the electrical connector 221.

[0077] Specifically, the electrical connection assembly 22 includes a plurality of electrical connection pieces 221, which are electrically connected to the tab leads 211 of a plurality of battery cells 21 to connect the plurality of battery cells 21 in series or in parallel. A portion of the plurality of electrical connection pieces 221 and the tab leads 211 are located within the partition cavity 102.

[0078] In some examples, the battery device 1 includes two electrical connection components 22, the battery pack 20 at both ends in the second direction and the housing 10 define two partition cavities 102, the two partition cavities 102 are located on both sides of the battery pack 20 in the second direction, and the two electrical connection components 22 are respectively disposed in the two partition cavities 102.

[0079] In some embodiments, the base plate 61 has a flow channel inside, and the base plate 61 exchanges heat with the battery pack 20. The first side beam 11 is provided with a second heat absorber 50 on the side facing the battery pack 20. The first side beam 11 is provided with a mating hole 112, and the second heat absorber 50 is provided with a clearance hole 51. The cooling connector 63 is adapted to connect with the flow channel of the base plate 61 through the mating hole 112 and the clearance hole 51. The cooling connector 63 includes an inlet and an outlet to realize the circulation of coolant in the flow channel, thereby realizing the cooling of the battery pack 20.

[0080] In some specific embodiments of the present invention, by providing a first heat-absorbing element 40 and a second heat-absorbing element 50, passive protection of the battery device 1 in the event of thermal runaway is achieved.

[0081] Compared to the existing technology that installs a fire extinguishing device inside the battery device 1, where the fire extinguishing of the battery device 1 relies on the signal triggering active protection of the thermal runaway detection device, this embodiment does not require the design of a complex fire extinguishing device and does not occupy too much space inside the package, which makes it easier to reduce the cost of the battery device 1 while ensuring thermal runaway protection.

[0082] In some embodiments of the present invention, such as Figure 4 , Figure 5 As shown, the outer casing 10 includes a frame 100, a cooling chamber 121 is provided inside the frame 100, and a connecting hole 122 is provided in the frame 100. The cooling chamber 121 is connected to the receiving chamber 101 through the connecting hole 122. The frame 100 is provided with a pressure relief component 62 that opens to release gas under set conditions. When the pressure relief component 62 is opened, the gas in the cooling chamber 121 is discharged from the pressure relief component 62.

[0083] The gas generated in the receiving cavity 101 is suitable to enter the cooling cavity 121 through the connecting hole 122. After the gas pressure in the cooling cavity 121 reaches the predetermined gas pressure, the pressure relief component 62 is opened so that the gas in the cooling cavity 121 is discharged from the pressure relief component 62, thereby relieving the pressure on the battery device 1.

[0084] The cooling chamber 121 is provided so that when a battery cell 21 in the battery device 1 experiences thermal runaway, the gas can be cooled in the cooling chamber 121, so as to prevent open flames from being ejected from the pressure relief component 62 when the gas is discharged from the pressure relief component 62.

[0085] In some alternative embodiments of the present invention, such as Figure 4 , Figure 5 As shown, the frame 100 includes an intersecting first side beam 11 and a second side beam 12. The second side beam 12 is provided with a connecting hole 122 and a cooling cavity 121. The first side beam 11 is provided with a pressure relief cavity 111 communicating with the cooling cavity 121, and the pressure relief cavity 111 is provided with a pressure relief component 62. The cooling cavity 121 and the pressure relief cavity 111 can be set up within the space of the frame 100, which facilitates the improvement of the utilization rate of the space within the battery device 1.

[0086] In some embodiments, such as Figure 5 As shown, the frame 100 includes two first side beams 11 and two second side beams 12. Each first side beam 11 defines two pressure relief chambers 111, and each pressure relief chamber 111 is provided with a pressure relief component 62.

[0087] Each second side beam 12 defines a cooling cavity 121 extending along the second direction. Both ends of the cooling cavity 121 have pressure relief cavities 111 communicating with the cooling cavity 121. Gas entering the cooling cavity 121 can flow along the second direction to the pressure relief cavity 111 and be discharged through the pressure relief component 62 along the pressure relief cavity 111.

[0088] In some alternative embodiments of the present invention, such as Figure 5 As shown, the cooling chamber 121 is provided with multiple partitions, which are arranged parallel to each other along the second direction and perpendicular to the first direction.

[0089] The multiple partitions include at least two first partitions 151. In the second direction, the cooling cavity 121 includes a first wall 1212 and a second wall 1213. One end of one of the two adjacent first partitions 151 is connected to the first wall 1212 and the other end is spaced apart from the second wall 1213. One end of the other of the two adjacent first partitions 151 is spaced apart from the first wall 1212 and the other end is connected to the second wall 1213, dividing the cooling cavity 121 into multiple connected and tortuous cooling channels 1211.

[0090] Specifically, by using at least two first partitions 151, the cooling chamber 121 can be divided into multiple S-shaped cooling channels 1211 connected end to end. This facilitates increasing the length of the channels inside the cooling chamber 121, increasing the path of gas flow inside the cooling chamber 121, and thus improving the cooling effect of the cooling chamber 121, so as to prevent open flames from being ejected from the pressure relief component 62 when the gas is discharged from the pressure relief component 62.

[0091] In some specific embodiments of the present invention, such as Figure 5 , Figure 6 As shown, the multiple partitions also include a second partition 152, the two ends of which are spaced apart from the first wall 1212 and the second wall 1213, respectively.

[0092] In some embodiments, the partition is a heat exchange section adapted to exchange heat with the gas in the cooling chamber 121. The partition can be used to further cool and extinguish the flame, preventing open flame from being discharged from the pressure relief component 62 of the battery device 1.

[0093] Specifically, the first partition 151 is a heat exchange section, and / or the second partition 152 is a heat exchange section. By setting multiple partitions, the heat exchange area can be increased to enhance heat transfer, thereby improving the cooling effect on the flame entering the cooling chamber 121.

[0094] In some embodiments, the thickness of the partition ranges from 0.5mm to 1.5mm.

[0095] If the separator thickness is too large, the total mass of the separator will be too large, thus affecting the mass energy density of the battery device 1. If the separator thickness is too small, the heat capacity of a single separator will be too small, and the cooling capacity will be insufficient to cool and extinguish the flame.

[0096] Furthermore, the thickness of the partition can be 0.5mm, 0.7mm, 0.9mm, 1mm, 1.2mm or 1.5mm.

[0097] In some embodiments, the minimum spacing between adjacent partitions ranges from 3mm to 6mm.

[0098] If the gap between adjacent separators is too large, the limited cooling chamber 121 will result in too few separators, and the cooling heat exchange area within the cooling chamber 121 will be insufficient to extinguish the flame inside the battery device 1. If the gap between adjacent separators is too small, the total mass of the separators will be too large, thereby affecting the mass energy density of the battery device 1 and causing excessive pressure relief resistance.

[0099] Furthermore, the minimum spacing between adjacent partitions can be 3mm, 3.5mm, 4mm, 4.5mm, 5mm, or 6mm.

[0100] In summary, by limiting the thickness of the separator and the range of the gap between adjacent separators, it is possible to ensure that the cooling channel 1211 has sufficient heat exchange area while not being too heavy, and the flow resistance of the cooling channel 1211 will not affect the normal depressurization of the battery device 1.

[0101] Specifically, the first heat absorber 40 and the second heat absorber 50 help reduce the flame temperature and ensure that only a limited number of battery cells 21 become uncontrollable, thereby limiting the combustion time of the battery cells 21. This makes it possible to cool and extinguish the flame by setting baffles in the cooling channel 1211.

[0102] In summary, by setting up the first heat-absorbing element 40 and the second heat-absorbing element 50, and setting up the cooling chamber 121, the effect of no open flame outside the battery device 1 is achieved.

[0103] In some embodiments, such as Figure 5As shown, multiple partitions are arranged along a third direction (it should be understood that the above direction is only for the convenience of describing the drawings and does not limit the actual installation position and orientation of the battery device 1). There are multiple first partitions 151, and multiple second partitions 152 are provided between two adjacent first partitions 151. The ends of two adjacent first partitions 151 connected to the inner wall of the cooling cavity 121 are staggered in a second direction to form a serpentine cooling flow channel 1211 in the cooling cavity 121, which facilitates increasing the length of the cooling flow channel 1211 and improving the cooling effect of the cooling cavity 121.

[0104] In some specific embodiments of the present invention, such as Figure 5 As shown, there are multiple connecting holes 122, which are arranged at intervals. The gas in the receiving cavity 101 is suitable to enter the cooling cavity 121 through the multiple connecting holes 122. This facilitates the cooling speed of the gas flame by the cooling cavity 121 and also facilitates the depressurization speed of the battery device 1.

[0105] In some embodiments of the present invention, the first heat-absorbing element 40 includes a first encapsulation film and a first heat-absorbing material, the first encapsulation film wrapping the first heat-absorbing material, and the second heat-absorbing element 50 includes a second encapsulation film and a second heat-absorbing material, the second encapsulation film wrapping the second heat-absorbing material.

[0106] In some embodiments, the first heat-absorbing material includes a hydrogel or an inorganic hydrated salt; and / or the second heat-absorbing material includes a hydrogel or an inorganic hydrated salt, wherein the hydrogel or inorganic hydrated salt is in a gel-like or solid state before the phase change, and the heat-absorbing material will not flow out after the encapsulation film on the surface of the heat-absorbing material is broken, which is intended to protect the first side beam 11, the top cover 13 and the bottom plate 61 of the battery device 1 from being penetrated by the flame.

[0107] In some embodiments, the first heat-absorbing material satisfies .in, This represents the heat absorption per unit area of ​​the first heat-absorbing material. The unit is kJ / m 2 , The time of thermal runaway of the battery cell 21 is 120, where 120 represents the amount of heat transferred by the flame to the heat-absorbing element per unit area per unit time.

[0108] In some embodiments, the material of the second heat absorber 50 satisfies: .in, This represents the heat absorption per unit area of ​​the second heat-absorbing material. The unit is kJ / m 2 , The time of thermal runaway of the battery cell 21 is 120, where 120 represents the amount of heat transferred by the flame to the heat-absorbing element per unit area per unit time.

[0109] Specifically, the first heat-absorbing material and the second heat-absorbing material can be made of the same or different materials, but both must satisfy the following conditions: The heat absorption per unit area of ​​the heat-absorbing material and the combustion time of the battery cell 21 during thermal runaway satisfy the above-mentioned relationship to ensure that the heat absorbed by the heat-absorbing material is greater than the heat generated by the thermal runaway of the battery pack 20, thereby achieving the technical effect of preventing fire outside the battery device 1.

[0110] It should be noted that the thermal runaway combustion time of the battery cell 21 Depending on the battery cell 21 system and the battery cell 21, it is not a parameter that can be easily controlled at the design level. Therefore, its range is not limited here. The thermal runaway combustion time of each battery cell 21 can be obtained through simulation or experiment.

[0111] Specifically, the combustion time of battery cell 21 It can be measured in the following ways: Battery cells 21 are charged to 100% SOC. A calcium silicate plate is placed tightly against each outer side of battery cell 21 (except the side with the pressure relief component 62). The calcium silicate thickness should be greater than 20 cm, and the calcium silicate products should conform to the national standard GB / T10699-2015 "Calcium Silicate Thermal Insulation Products". The calcium silicate plate is then fixed to the outside with metal clamps. The type of clamp is not specifically limited, as long as it ensures that the calcium silicate plate and battery cell 21 are fixed in the clamps during the test. The battery cell 21 and clamps are heated to 45℃±2℃ in an oven and then placed on a needle penetration test bench. A 5mm diameter straight steel needle is then inserted into the battery at a speed of 1mm / s until thermal runaway occurs. Thermal runaway of battery cell 21 is defined as the opening of the explosion-proof valve of battery cell 21 and a voltage drop of less than 20% of the initial voltage. The total time for the battery cell 21 to erupt with flame during thermal runaway is recorded. (Unit: s).

[0112] Heat absorption per unit area of ​​heat-absorbing material It itself has no scope limitations, as long as it is related to The relationship satisfying the above formula can achieve the technical effect of preventing the battery device 1 from catching fire, therefore, no further action is taken. The scope of itself is limited.

[0113] Heat absorption per unit area of ​​heat-absorbing material It is related to the thickness, density, and unit mass of the heat absorber.

[0114] The above formula, by defining the relationship between the runaway combustion time of a single battery cell 21, the thickness and density of the heat-absorbing material, and the heat absorbed per unit mass of the heat-absorbing material, aims to prevent the first side beam 11, top cover 13, and bottom plate 61 of the battery device 1 from being penetrated by the flames of the battery cell 21 that will directly combust due to thermal runaway.

[0115] Among them, the heat absorption per unit area of ​​the heat-absorbing material It can be calculated using the following formula:

[0116] In the formula, The mass of a single heat-absorbing material (unit: kg) The area of ​​a single heat-absorbing material (unit: m²) 2 ), The heat absorbed per unit mass of the heat-absorbing material (unit: J / kg). It can be determined by the following method: Differential Scanning Calorimetry (DSC) was used to test endothermic materials. Specifically, the masses of the encapsulation film, heat-absorbing material, and framework are first measured separately, with their mass percentages being a, b, and c, respectively. Then, samples are taken from the encapsulation film, heat-absorbing material, and framework, and DSC is used to measure the heat absorption Ha, Hb, and Hc of the encapsulation film, heat-absorbing material, and framework during the temperature rise from 25°C to 300°C. The heat absorption per unit mass of the heat-absorbing component is the mass-weighted value of the heat absorption of each component, calculated using the formula H = a × Ha + b × Hb + c × Hc. In this embodiment, the heating rate during the DSC test is 10°C / min, and the test atmosphere is air.

[0117] The heat-absorbing components listed above consist of an encapsulation film, a heat-absorbing material, and a frame. However, the composition of the heat-absorbing components is not limited to the examples above. In some other embodiments, the frame may not be included; in other embodiments, other components may be included, which will not be elaborated here.

[0118] It is understandable that the first heat-absorbing element 40 is disposed on both sides of the battery cell 21. The first heat-absorbing element 40 is used to prevent the high-temperature flames emitted by the thermal runaway battery cell 21 from causing thermal runaway of adjacent battery cells 21, thereby improving the safety of the battery device 1 and slowing down the rate of thermal diffusion of the battery cell 21.

[0119] The inner wall of the first side beam 11, the lower surface of the top cover 13, and the upper surface of the bottom plate 61 are all provided with second heat-absorbing elements 50, so that the second heat-absorbing material meets the requirements. In order to ensure that the heat absorbed by the second heat-absorbing material is greater than the heat generated by the thermal runaway of the battery pack 20, the technical effect of preventing the battery device 1 from catching fire can be achieved.

[0120] For the first heat-absorbing material, the first heat-absorbing material satisfies... At this time, it can play a good role in preventing heat diffusion. Whether an open flame appears outside the battery device 1 is mainly related to the second heat-absorbing material. Specifically, when the first heat-absorbing material does not meet the requirements... The second heat-absorbing material satisfies At the same time, no open flame will appear outside the battery device 1.

[0121] Based on the above explanation, this section focuses on the heat absorption per unit area of ​​the second heat-absorbing material. And the 21-cell combustion time of the battery cell Experiments were conducted on the relationship between them.

[0122] As shown in Table 1, when the combustion time of battery cell 21 is 24s, for different second heat-absorbing materials... Results of thermal runaway test of needle-puncture battery device 1.

[0123] As shown in Table 2, the second heat-absorbing material 3000kJ / m 2 At that time, for different battery cell 21 combustion times, the thermal runaway test results of the needle puncture battery device 1 were obtained.

[0124] Table 1

[0125] As shown in Table 1, for Examples 1-1 and 1-2, when the combustion time of the battery cell 21 is 24s, the heat absorption per unit area of ​​the selected second heat-absorbing material is 4500kJ / m². 2 Or 3000kJ / m 2 At that time, it can satisfy At this time, there is no open flame outside battery device 1. For Comparative Examples 1-1 and 1-2, when the combustion time of a single battery cell is 24 seconds, the heat absorption per unit area of ​​the second heat-absorbing material is too small, which leads to… If the value is less than 1, it will cause an open flame to appear outside the battery device 1.

[0126] As shown in Table 2, for Examples 2-1 and 2-2, when the heat absorption per unit area of ​​the second heat-absorbing material is 3000, the second heat-absorbing material can be used in battery devices 1 with shorter combustion times (e.g., 12s, 24s) for battery cells 21, which can meet the requirements. At this time, there is no open flame outside the battery device 1. For Comparative Examples 2-1 and 2-2, when the heat absorption per unit area of ​​the second heat-absorbing material is 3000, using the second heat-absorbing material in the battery device 1 with an excessively long combustion time for the battery cell 21 will lead to… If the value is less than 1, it will cause an open flame to appear outside the battery device 1.

[0127] The specific method for testing the thermal runaway of the needle-puncture battery device 1 is as follows: The needle penetration test for thermal runaway of battery device 1 involves placing a thermocouple at the center of the large surface of each battery cell 21 and stacking the battery cells 21 to form a battery pack 20. The battery pack 20 is charged until the state of charge (SOC) of each battery cell 21 is 100%, and the initial temperature of each battery cell 21 within the battery device 1 is controlled at 45℃±2℃. A 5mm diameter straight steel needle is inserted into the target battery cell 21 in the battery device 1 at a speed of 1mm / s until thermal runaway occurs (thermal runaway of battery cell 21 means that the explosion-proof valve of battery cell 21 opens and the voltage of the battery cell 21 drops to less than 20% of its initial voltage). After 2 minutes, the needle is withdrawn. The maximum penetration depth is 80mm. Continuous observation is performed, and if an open flame appears outside the battery device 1, it is recorded as an open flame outside the battery device 1. The open flame includes flames ejected from the pressure relief component 62, as well as flames ejected from other damaged parts such as the top cover 13, the bottom plate 61, or the first side beam 11 of the battery device 1.

[0128] In some optional embodiments of the present invention, the battery device 1 may refer to an independent battery component, such as a battery module or a battery pack; the battery device 1 may also be a composite structure with a higher degree of integration, such as a CTC integrated chassis, a skateboard chassis, or other integrated units that incorporate a battery system.

[0129] The following describes an electrical appliance according to an embodiment of the present invention. The electrical appliance according to an embodiment of the present invention includes a battery device 1 according to the above-described embodiment.

[0130] According to the embodiments of the present invention, the electrical equipment utilizes the battery device 1 of the present invention described above. By providing a first heat-absorbing element 40 for each battery cell 21, the first heat-absorbing element 40 can block heat transfer between adjacent battery cells 21, absorb heat on the tab lead-out piece 211, and prevent the tab lead-out piece 211 from further transferring heat to the interior of the battery cell 21. This can prevent the high-temperature flames emitted by the thermally runaway battery cell 21 from causing thermal runaway of adjacent battery cells 21, thereby improving the safety of the battery device 1 and slowing down the rate of heat diffusion from the battery cell 21, thus providing more time for personnel to escape.

[0131] The electrical equipment mentioned here can include, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc.

[0132] Among them, electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys; spacecraft can include airplanes, rockets, space shuttles, and spacecraft; power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers.

[0133] In some embodiments, the electrical equipment is a vehicle, which may be a pure electric vehicle or a hybrid vehicle.

[0134] Other configurations and operations of the electrical equipment according to embodiments of the present invention are known to those skilled in the art and will not be described in detail here.

[0135] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention 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, and therefore should not be construed as a limitation of the invention. Furthermore, features defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more. In the description of this invention, "above" or "below" a second feature may include direct contact between the first and second features, or it may include contact between the first and second features not being in direct contact but through another feature between them.

[0136] In the description of this invention, the terms "above," "over," and "on top" for the first feature and the second feature include the first feature being directly above or diagonally above the second feature, or simply indicating that the first feature is at a higher horizontal level than the second feature.

[0137] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0138] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0139] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A battery device, characterized in that, include: The outer shell (10) defines a receiving cavity (101); The battery pack (20) is disposed in the receiving cavity (101). The battery pack (20) includes a plurality of battery cells (21) arranged along a first direction. Each battery cell (21) is provided with a tab lead-out piece (211). First heat absorber (40): Each of the battery cells (21) is provided with a first heat absorber (40), and the first heat absorber (40) corresponding to each of the battery cells (21) extends to the tab lead-out piece (211) to exchange heat with the tab lead-out piece (211).

2. The battery device according to claim 1, characterized in that, Each of the battery cells (21) is provided with the first heat-absorbing element (40) on both sides of the first direction.

3. The battery device according to claim 2, characterized in that, The two first heat-absorbing elements (40) corresponding to the battery cell (21) cooperate to define a placement cavity, the battery cell (21) is located in the placement cavity, and the tab lead-out piece (211) extends out of the placement cavity; and / or, the tab lead-out piece (211) is located on one side of the battery cell (21) in the second direction, the side of the battery cell (21) in the first direction is the side with the largest area, the first heat-absorbing element (40) covers at least part of the side of the battery cell (21) in the first direction, at least part of the side of the battery cell (21) in the second direction, and at least part of the tab lead-out piece (211), the first direction and the second direction intersect.

4. The battery device according to any one of claims 1-3, characterized in that, A partition cavity (102) is provided between the battery pack (20) and the outer casing (10), and a second heat-absorbing element (50) is provided in the partition cavity (102). The second heat-absorbing element (50) is provided on at least one wall of the partition cavity (102).

5. The battery device according to claim 4, characterized in that, The partition cavity (102) is located on one side of the battery pack (20) in the second direction, and the first direction and the second direction are perpendicular. The tab lead-out piece (211) is located inside the partition cavity (102).

6. The battery device according to claim 5, characterized in that, The outer casing (10) includes a first side beam (11), a top cover (13), and a bottom plate (61). The first side beam (11) is spaced apart from the battery pack (20) in a second direction. In a third direction, the top cover (13) and the bottom plate (61) are arranged opposite to each other. The battery pack (20) is disposed between the bottom plate (61) and the top cover (13). The top cover (13) and the bottom plate (61) are respectively connected to the first side beam (11) to form the partition cavity (102) between them and the end of the battery pack (20). At least one of the bottom plate (61), the top cover (13), and the first side beam (11) is provided with a second heat-absorbing element (50). The first direction, the second direction, and the third direction are perpendicular to each other.

7. The battery device according to claim 6, characterized in that, The bottom plate (61) has a flow channel inside, and the bottom plate (61) exchanges heat with the battery pack (20). The bottom plate (61) has a second heat-absorbing element (50) on the side facing the top cover (13). And / or, the battery device further includes a bottom cover plate (14) disposed on the side of the bottom plate (61) opposite to the battery pack (20); And / or, the battery pack (20) includes a plurality of electrical connectors (221) that are electrically connected to a plurality of tabs (211), the tabs (211) extending to the side of the electrical connectors (221) away from the battery cell (21) to be electrically connected to the electrical connectors (221).

8. The battery device according to claim 6, characterized in that, The base plate (61) has a flow channel inside, and the base plate (61) exchanges heat with the battery pack (20). The first side beam (11) has a second heat absorber (50) on the side facing the battery pack (20). The first side beam (11) has a mating hole (112), and the second heat absorber (50) has a clearance hole (51). The cooling connector (63) is adapted to connect with the flow channel inside the base plate (61) through the mating hole (112) and the clearance hole (51).

9. The battery device according to claim 4, characterized in that, The first heat-absorbing element (40) includes a first encapsulation film and a first heat-absorbing material, wherein the first encapsulation film encapsulates the first heat-absorbing material. The second heat-absorbing element (50) includes a second encapsulation film and a second heat-absorbing material, wherein the second encapsulation film encapsulates the second heat-absorbing material. Wherein, the first heat-absorbing material includes a hydrogel or an inorganic hydrated salt; and / or The second heat-absorbing material includes a hydrogel or an inorganic hydrated salt; and / or The first heat-absorbing material satisfies , This represents the amount of heat absorbed per unit area by the first heat-absorbing material. The unit is kJ / m 2 , The jetting time of thermal runaway of the battery cell (21); and / or The second heat-absorbing material satisfies , This represents the heat absorption per unit area of ​​the second heat-absorbing material. The unit is kJ / m 2 , The time of thermal runaway of the battery cell (21) is the time of combustion.

10. The battery device according to any one of claims 1-9, characterized in that, The outer casing (10) includes a frame (100), a cooling cavity (121) is provided inside the frame (100), and a connecting hole (122) is provided in the frame (100). The cooling cavity (121) is connected to the receiving cavity (101) through the connecting hole (122). The frame (100) is provided with a pressure relief member (62) that opens under set conditions to release gas. When the pressure relief member (62) is opened, the gas in the cooling chamber (121) is discharged from the pressure relief member (62).

11. The battery device according to claim 10, characterized in that, The frame (100) includes an intersecting first side beam (11) and a second side beam (12). The second side beam (12) is provided with the connecting hole (122) and the cooling cavity (121). The first side beam (11) is provided with a pressure relief cavity (111) that communicates with the cooling cavity (121). The pressure relief cavity (111) is provided with the pressure relief component (62).

12. The battery device according to claim 10, characterized in that, The cooling cavity (121) is provided with multiple partitions, which are arranged parallel to each other along a second direction, which is perpendicular to the first direction. The multiple partitions include at least two first partitions (151), and the cooling cavity (121) includes a first wall (1212) and a second wall (1213) arranged opposite to each other in the second direction. One end of one of the two adjacent first partitions (151) is connected to the first wall (1212), and the other end is spaced apart from the second wall (1213). One end of the other of the two adjacent first partitions (151) is spaced apart from the first wall (1212), and the other end is connected to the second wall (1213), so as to divide the cooling cavity (121) into a plurality of connected and tortuous cooling channels (1211).

13. The battery device according to claim 12, characterized in that, The plurality of partitions further includes a second partition (152), the two ends of which are spaced apart from the first wall (1212) and the second wall (1213), respectively. Wherein, at least two of the first partitions (151) are provided with a second partition (152), and / or A second partition (152) is provided between the first partition (151) and the top wall of the cooling cavity (121), and / or A second partition (152) is provided between the first partition (151) and the bottom wall of the cooling cavity (121).

14. The battery device according to claim 13, characterized in that, The partition is adapted to exchange heat with the gas in the cooling chamber (121); and / or The thickness of the partition plate ranges from 0.5mm to 1.5mm; and / or The minimum spacing between adjacent partitions ranges from 3mm to 6mm.

15. An electrical appliance, characterized in that, The battery device (1) includes any one of claims 1-14.

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