Battery pack and electric equipment

Abstract

The utility model relates to a battery pack and electric equipment, the battery pack comprises a box body and at least one battery pack located in the box body, and the battery pack has a first direction, a second direction and a third direction which are perpendicular to one another; the battery pack comprises a first battery pack and a second battery pack which are arranged along a first direction, each of the first battery pack and the second battery pack comprises a plurality of single batteries, and the single batteries are arranged along a second direction; the heat dissipation assembly is connected with the box body and comprises a first heat dissipation plate and a second heat dissipation plate which are perpendicular to each other, the first heat dissipation plate is located at one end, in the third direction, of the first battery pack and the second battery pack and connected with the first battery pack and the second battery pack, and the second heat dissipation plate is located between the first battery pack and the second battery pack; and the second heat dissipation plate is connected with the first heat dissipation plate. According to the battery pack and the electric equipment, balanced heat dissipation of the batteries is ensured while the space utilization rate is improved.

Description

Technical Field

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

[0002] The battery pack includes a box body and a plurality of single cells, and the plurality of single cells are directly integrated into the box body.

[0003] In existing battery packs, multiple single cells are stacked in the vertical direction of the box, which occupies the vertical space of the box and reduces the space utilization rate. During the rapid charging and high current discharge of the battery pack, each single cell will generate a lot of heat, resulting in the problem of uneven heat dissipation of the battery pack. Utility Model Content

[0004] The purpose of the present application is to provide a battery pack and an electrical device, which improve space utilization while ensuring balanced heat dissipation of the battery pack.

[0005] In a first aspect, an embodiment of the present application provides a battery pack, comprising a case and at least one battery group located in the case, the battery pack having a first direction, a second direction and a third direction perpendicular to each other, the battery pack comprising: a first battery group and a second battery group, arranged along the first direction, the first battery group and the second battery group each comprising a plurality of single cells, the plurality of single cells arranged along the second direction; a heat dissipation assembly connected to the case, the heat dissipation assembly comprising a first heat dissipation plate and a second heat dissipation plate arranged perpendicular to each other, the first heat dissipation plate being located at one end of the first battery group and the second battery group along the third direction and being connected to the first battery group and the second battery group, the second heat dissipation plate being located between the first battery group and the second battery group and being connected to the first heat dissipation plate.

[0006] In a possible implementation, an explosion-proof valve is provided at one end of the single battery away from the second heat sink, two explosion-proof valves located on both sides of the second heat sink along the first direction face away from each other, and a gap is provided between the explosion-proof valve and the box body.

[0007] In a possible implementation, the single battery includes a first surface and a second surface, the first surface and the second surface are arranged opposite to each other along a first direction, the explosion-proof valve is arranged on the first surface, and the second surface is connected to the second heat dissipation plate.

[0008] In a possible implementation, the single cell also includes two first side surfaces and two second side surfaces connected between the first surface and the second surface, the two first side surfaces are arranged opposite to each other along the second direction, the two second side surfaces are arranged opposite to each other along the third direction, the surface area of ​​the first side surface is greater than the surface area of ​​the second side surface, the first side surface is arranged perpendicular to the first heat sink and the second heat sink, the second side surface is arranged parallel to the first heat sink, and one of the second side surfaces is connected to the first heat sink.

[0009] In a possible implementation, there are multiple battery packs, and the multiple battery packs are arranged at intervals along the first direction.

[0010] In a possible implementation, the battery pack further includes a plurality of partitions disposed in the box body, the plurality of partitions are arranged at intervals along a first direction, the partitions are located between two adjacent battery groups, and a gap is provided between the partitions and the explosion-proof valve.

[0011] In a possible implementation, a plurality of first flow channels arranged along a first direction are provided in the first heat dissipation plate, and the first flow channels extend along a second direction; a plurality of second flow channels arranged along a third direction are provided in the second heat dissipation plate, and the second flow channels extend along the second direction.

[0012] In a possible implementation, a plurality of single cells are respectively bonded to the first heat sink and the second heat sink; and / or the first heat sink and the housing are connected via fasteners; and / or the first heat sink and the second heat sink are bonded or welded.

[0013] In a possible implementation, the first heat sink and the second heat sink are both liquid cooling plates, and the thermal conductivity of the two liquid cooling plates is the same.

[0014] In a second aspect, an embodiment of the present application provides an electrical device, including a battery pack as described above.

[0015] According to the battery pack and electrical equipment provided by the embodiment of the present application, the first battery group and the second battery group formed by multiple single cells are placed side by side in the box, thereby avoiding the stacking of single cells in the vertical direction. When the battery pack is installed on the vehicle chassis, it is beneficial to lower the center of gravity of the vehicle, improve the comfort of the whole vehicle, and effectively improve the space utilization rate of the whole vehicle in the vertical direction; the first heat sink and the second heat sink, which are perpendicular to each other, can bring the heat generated by multiple single cells out of the box in time to ensure balanced heat dissipation of the battery pack. In addition, since the entire battery pack eliminates the module structure, the number of parts is reduced, and the production cost of the battery pack is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In addition, in the drawings, the same parts are marked with the same reference numerals, and the drawings are not drawn according to the actual scale.

[0017] Figure 1 A schematic diagram showing the structure of a battery pack without a cover plate provided in an embodiment of the present application is shown;

[0018] Figure 2 Show Figure 1 A schematic diagram of the structure of a battery pack in the battery pack shown;

[0019] Figure 3 Show Figure 2 Schematic diagram of the structure of a single cell in a battery pack shown.

[0020] Reference numerals:

[0021] 1- box; 2- battery pack; 3- partition;

[0022] 21-first battery pack; 210-single battery; 210a-first surface; 210b-second surface; 210c-first side surface; 210d-second side surface; 211, explosion-proof valve; 212-pole; 22-second battery pack; 23-first heat sink; 24-second heat sink. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0024] In the related technology, most of the Pack (combined battery) solutions have two types. One solution is to assemble multiple single cells into a battery module, and then put the battery module into a battery box. The box is also equipped with a heat sink, battery management system, end side plates, cover plates, brackets and other parts. There are problems such as complex structure, low space utilization, and uneven heating of the battery pack. Another solution is to omit the middle battery module structure and directly integrate multiple single cells into the battery pack to simplify the Pack structure and improve space utilization. However, there are also the following defects:

[0025] Without the protection measures at the module level, a problem with a single cell can easily endanger the entire battery pack, and the thermal runaway management of the cell becomes more difficult. In order to improve the vertical space utilization, some solutions use multi-layer cell stacking. The bottom cell is under greater pressure, and when the cell expands in volume after long-term use, the explosion-proof valve is easily damaged. As the space utilization rate increases, the number of cells in a box of the same volume increases, and the heat released also increases. The single-sided liquid cooling plate cannot effectively take away the heat from different parts of the cell, which can easily cause local overheating and thermal runaway. The explosion-proof valve of the cell faces the upper cover of the battery box and is separated from the passengers by only the floor. When the cell expands in volume or thermal runaway occurs, the high-pressure and high-temperature gas generated is directly aimed at the passengers, posing a great safety hazard.

[0026] To this end, the present application embodiment provides a battery pack, such as Figure 1 and Figure 2 As shown, the battery pack includes a box body 1 and at least one battery group 2 located in the box body 1, and the battery group 2 includes: a first battery group 21, a second battery group 22 and a heat dissipation component.

[0027] The battery pack has a first direction X, a second direction Y and a third direction Z that are perpendicular to each other. The first battery group 21 and the second battery group 22 are arranged along the first direction X. The first battery group 21 and the second battery group 22 each include a plurality of single cells 210 arranged along the second direction Y.

[0028] The heat dissipation assembly is connected to the box body 1, and the heat dissipation assembly includes a first heat dissipation plate 23 and a second heat dissipation plate 24 which are arranged perpendicular to each other. The first heat dissipation plate 23 is located at one end of the first battery group 21 and the second battery group 22 along the third direction Z, and is connected to the first battery group 21 and the second battery group 22. The second heat dissipation plate 24 is located between the first battery group 21 and the second battery group 22, and is connected to the first heat dissipation plate 23.

[0029] In this embodiment, the battery pack includes at least one battery group 2, and the battery group 2 includes a first battery group 21 and a second battery group 22 arranged along a first direction X. The multiple single cells 210 of the first battery group 21 and the second battery group 22 are arranged along a second direction Y, respectively. There is no stacking design for the multiple single cells 210 in the third direction Z, which can prevent the single cells at the bottom from being subjected to the gravity pressure of the single cells at the top, and ensure the force uniformity of the multiple single cells 210 to the greatest extent. In addition, the multiple single cells 210 are placed sideways in the box 1, and the multiple single cells 210 are connected in series or in parallel, eliminating the intermediate module structure, simplifying the Pack process, and being conducive to improving the space utilization of the battery pack, saving the space utilization of the box 1 in the third direction Z, and when the battery pack is equipped on the chassis of the car, it is conducive to lowering the center of gravity of the vehicle and improving the comfort of the whole vehicle.

[0030] Furthermore, the first heat sink 23 is located at one end of the first battery pack 21 and the second battery pack 22 along the third direction Z, and is connected to the first battery pack 21 and the second battery pack 22. The second heat sink 24 is located between the first battery pack 21 and the second battery pack 22, and is connected to the first heat sink 23, so that the first heat sink 23 and the second heat sink 24 can take away the heat from different parts of the single battery 210 and the second single battery 220, with a larger heat dissipation area and more balanced heat dissipation, effectively avoiding the occurrence of local thermal runaway of the battery pack and strengthening the thermal management of the battery pack. At the same time, the first heat sink 23 and the second heat sink 24 replace the side plates of the module structure in the related art, reducing parts and simplifying the assembly process.

[0031] According to the battery pack provided in the embodiment of the present application, the first battery group 21 and the second battery group 22 formed by multiple single cells 210 are placed side by side in the box body 1 to avoid the stacking of multiple single cells 210 in the vertical direction. When the battery pack is assembled on the vehicle chassis, the center of gravity of the vehicle can be lowered, which is conducive to improving the comfort of the whole vehicle and effectively improving the space utilization of the whole vehicle in the vertical direction; the first heat sink 23 and the second heat sink 24 perpendicular to each other can timely bring the heat generated by the multiple single cells 210 out of the box body 1 to ensure balanced heat dissipation of the battery pack. In addition, since the entire battery pack eliminates the module structure, the number of parts is reduced, the assembly process is simplified, and the production cost of the battery pack is reduced.

[0032] In some embodiments, an explosion-proof valve 211 is provided at one end of the single battery 210 away from the second heat dissipation plate 24 , and the two explosion-proof valves 211 on both sides of the second heat dissipation plate 24 along the first direction X are oriented in opposite directions, and a gap is provided between the explosion-proof valve 211 and the box body 1 .

[0033] Since the explosion-proof valve 211 of the single battery 210 is placed sideways in the box body 1 along the first direction X, and a gap for exhaust of the explosion-proof valve 211 is provided between the explosion-proof valve 211 and the box body 1, when the single battery 210 undergoes volume expansion or thermal runaway, even if the explosion-proof valve 211 is damaged, the high-pressure and high-temperature harmful gas generated by it will not be directly directed at the passengers above the box body 1, effectively eliminating the potential safety hazard.

[0034] In some embodiments, the single battery 210 includes a first surface 210 a and a second surface 210 b , which are arranged opposite to each other along a first direction X; the explosion-proof valve 211 is arranged on the first surface 210 a , and the second surface 210 b is connected to the second heat dissipation plate 24 .

[0035] like Figure 3As shown, the multiple single cells 210 of the first battery group 21 and the multiple single cells 210 of the second battery group 22 are symmetrically arranged relative to the second heat sink 24, and the first surface 210a and the second surface 210b of the single cell 210 are relatively arranged along the first direction X. The first surface 210a is provided with an explosion-proof valve 211, and the second surface 210b is connected to the second heat sink 24 by, for example, thermal conductive adhesive. With such an arrangement, the heat generated by the single cell 210 can be released from the side of the first direction X. When a single single cell 210 undergoes volume expansion or thermal runaway, even if the explosion-proof valve 211 is damaged, the high-pressure and high-temperature harmful gas generated by it will not be directly aimed at the passengers above, thereby effectively eliminating safety hazards.

[0036] In some embodiments, the single battery 210 further includes two first side surfaces 210c and two second side surfaces 210d located between the first surface 210a and the second surface 210b, the two first side surfaces 210c are arranged opposite to each other along the second direction Y, the two second side surfaces 210d are arranged opposite to each other along the third direction Z, the surface area of ​​the first side surface 210c is greater than the surface area of ​​the second side surface 210d, the first side surface 210c is arranged perpendicular to the first heat sink 23 and the second heat sink 24, the second side surface 210d is arranged parallel to the first heat sink 23, and one of the second side surfaces 210d is connected to the first heat sink 23. With such an arrangement, the heat dissipation area of ​​the single battery 210 or the second single battery 220 can be larger and the heat dissipation can be more balanced, the thermal management of the battery pack can be strengthened, and the local thermal runaway of the battery pack can be effectively avoided.

[0037] like Figure 2 and Figure 3 As shown, the shell of the single battery 210 is rectangular in shape, the length of each single battery 210 extends along the first direction X, and multiple single batteries 210 are arranged side by side along the second direction Y, which can reduce the overall occupied space of the battery pack. The surface area of ​​the first side surface 210c of the single cell 210 is greater than the surface area of ​​the second side surface 210d, wherein the first side surface 210c is located in a second plane XZ formed by the first direction X and the third direction Z, and the heat generated by the single cells 210 at both ends of the arrangement direction of the first battery group 21 is directly transferred to the outside air through the two first side surfaces 210c, and the heat generated by the remaining single cells 210 is respectively transferred to the adjacent single cells 210 through the two first side surfaces 210c, so that most of the heat generated by the battery pack is finally transferred to the outside air for heat dissipation; the second side surface 210d is located in the first plane XY, and one of the second side surfaces 210d is connected to the first heat sink 23, for example, by thermally conductive glue, and a small part of the heat generated by the single cell 210 is also dissipated through the first heat sink 23, so that the heat dissipation area of ​​the single cell 210 is larger and the heat dissipation is more balanced, thereby strengthening the thermal management of the battery pack and effectively avoiding the occurrence of local thermal runaway of the battery pack.

[0038] In some embodiments, there are multiple battery packs 2, and the multiple battery packs 2 are arranged at intervals along the first direction X. In one example, Figure 1 and Figure 2 As shown, the number of battery packs 2 is 8, and two adjacent battery packs 2 form one battery pack 2, with a total of 4 battery packs 2. The 4 battery packs 2 are arranged at intervals along the first direction X, and the first battery pack 21 and the second battery pack 22 in each battery pack 2 are symmetrically arranged relative to the second heat sink 24. That is, in the first battery pack 21 and the second battery pack 22 of each battery pack 2, the explosion-proof valves 211 of the two single cells 210 aligned along the first direction X are both located on the side away from the second heat sink 24, so that the explosion-proof valve 211 is located on one side of the single cell along the first direction X. When a single single cell 210 undergoes volume expansion or thermal runaway, even if the explosion-proof valve 211 is damaged, the high-pressure and high-temperature harmful gas generated by it will not be directly aimed at the passengers above, effectively eliminating safety hazards.

[0039] In addition, the multiple battery packs 2 are arranged at intervals along the first direction X, and the high-pressure and high-temperature harmful gas generated when the explosion-proof valve 211 is damaged can dissipate heat outward through the intervals, thereby improving the heat dissipation effect of the battery pack and further eliminating safety hazards.

[0040] It is understandable that there can be more battery packs 2 as long as the explosion-proof valves 211 of the single batteries 210 are placed sideways and heat is dissipated through the gaps between adjacent battery packs 2. This will not be elaborated any further.

[0041] In some embodiments, the battery pack further includes a plurality of partitions 3 disposed in the box body 1 , the plurality of partitions 3 are spaced apart along the first direction X, the partitions 3 are located between two adjacent battery groups 2 , and a gap is provided between the explosion-proof valve 211 and the partitions 3 .

[0042] like Figure 1 As shown, four battery packs 2 are arranged at intervals along the first direction X, and two adjacent battery packs 2 are separated by partitions 3, with a total of three partitions. The partitions 3 can improve the structural strength and rigidity of the box body 1, and prevent the battery pack from being damaged or deformed under external vibration or impact. In addition, a gap is provided between the explosion-proof valve 211 and the partition 3, and the gap is used for exhaust of the explosion-proof valve 211.

[0043] In some embodiments, one end of the single battery 210 provided with the explosion-proof valve 211 is also provided with a pole 212 ; the pole 212 of the single battery 210 located at the edge of the box body 1 is arranged toward the box body 1 , and a gap is provided between the pole 212 and the box body 1 .

[0044] like Figure 1 and Figure 2As shown, one end of the single battery 210 provided with the explosion-proof valve 211 is also provided with a pole 212, that is, the first surface 210a of the single battery 210 provided with the explosion-proof valve 211 is also provided with positive and negative poles 212, and the explosion-proof valve 211 is located between the positive and negative poles 212. Among them, the pole 212 of the single battery 210 located at the edge of the box body 1 is arranged toward the box body 1, and a gap is arranged between the pole 212 and the box body 1, so as to leave space for welding the pole 212, and the gap is also used for exhaust of the explosion-proof valve 211. The pole 212 of the single battery 210 located inside the box body 1 is arranged toward the partition 3, and a gap is arranged between the pole 212 and the partition 3, so as to leave space for welding the pole 212, and the gap is also used for exhaust of the explosion-proof valve 211.

[0045] In some embodiments, a plurality of single cells 210 are respectively bonded to the first heat sink 23 and the second heat sink 24. Optionally, a second side surface 210d of the single cell 210 is bonded to the first heat sink 23 by means of a thermally conductive adhesive, and a second surface 210b of the single cell 210 is bonded to the second heat sink 24 by means of a thermally conductive adhesive, which can achieve a fixed connection between the single cell 210 and the first heat sink 23 and the second heat sink 24 on the one hand, and the thermally conductive adhesive can accelerate heat transfer, further improving the heat dissipation effect of the battery pack.

[0046] In some embodiments, the first heat sink 23 is connected to the housing 1 by fasteners. The first heat sink 23 and the second heat sink 24 are bonded or welded. The first heat sink 23 is located in the first plane XY formed by the first direction X and the second direction Y, and the first heat sink 23 is connected to the bottom inner wall of the housing 1. Optionally, the first heat sink 23 and the housing 1 are connected by fasteners such as screws or pins to improve the connection reliability of the battery pack. The first heat sink 23 and the second heat sink 24 are arranged perpendicular to each other, and the two can be bonded and connected by thermal conductive adhesive to further improve the heat dissipation effect of the battery pack; the first heat sink 23 and the second heat sink 24 can also be welded to simplify the manufacturing process.

[0047] In some embodiments, the first heat sink 23 and the second heat sink 24 are both liquid cooling plates, and the thermal conductivity of the two liquid cooling plates is the same. Optionally, the first heat sink 23 and the second heat sink 24 are made of the same material and the same internal cooling medium to ensure that they have the same thermal conductivity. The cooling medium can be hydrocarbon and organosilicon compounds, fluorocarbon compounds, water or cooling gas, etc. In order to ensure that the cooling medium is always in a liquid phase under the temperature rise state and reduce volatilization, a liquid medium with a higher boiling point must be selected. At the same time, during use, try to choose a coolant with a low viscosity value to increase fluidity and reduce the pressure on the pump, forming a good system internal circulation. In this way, when the battery pack is working, the heat generated at the bottom and sides is brought out of the box 1 through the first heat sink 23 and the second heat sink 24, which are perpendicular to each other and have the same thermal conductivity, thereby ensuring balanced heat dissipation of the battery pack.

[0048] Furthermore, the first heat sink 23 is provided with a plurality of first flow channels arranged along the first direction X, and the first flow channels extend along the second direction Y; the second heat sink 24 is provided with a plurality of second flow channels arranged along the third direction Z, and the second flow channels extend along the second direction Y.

[0049] Specifically, the first heat sink 23 is located in a first plane formed by the first direction X and the second direction Y. A plurality of first flow channels are arranged in the first heat sink 23 and are spaced apart along the first direction X. The first flow channels extend along the second direction Y. The first flow channels have a first inlet and a first outlet. The first inlet and the first outlet are located at different ends of the first heat sink 23. The first inlets of the plurality of first flow channels are integrated at one end of the first heat sink 23, and the first outlets of the plurality of first flow channels are integrated at the other end of the first heat sink 23. The battery pack further includes a first delivery pipe and a first return pipe. The first delivery pipe is connected to the plurality of first inlets, and the first return pipe is connected to the plurality of first outlets.

[0050] In this way, the first delivery pipe is connected to multiple first inlets, the first return pipe is connected to multiple first outlets, and the first delivery pipe and the first return pipe are located at different ends of the first heat dissipation plate 23, so that the height of the first delivery pipe and the first return pipe is basically flush with the first heat dissipation plate 23, occupying a smaller space, and thus will not affect the arrangement of the second delivery pipe and the second return pipe of the second heat dissipation plate 24.

[0051] The cooling medium is guided to be input through the first inlet of the first flow channel to cool the battery packs on both sides. After passing through the fluid channel, the cooling medium is output from the first outlet of the first flow channel, and then the cooling medium is continuously input for cooling to ensure the cooling effect and efficiency.

[0052] Thus, the cooling medium is provided to the first heat sink 23 through the first delivery pipe, and the cooling medium output by the first heat sink 23 is recovered through the first reflux pipe, and the recovered cooling medium is cooled and then input into the first delivery pipe, so that a cycle is formed among the first delivery pipe, the first heat sink 23 and the first reflux pipe, thereby continuously cooling the battery pack and improving the cooling efficiency.

[0053] Furthermore, a plurality of second flow channels spaced apart along a third direction Z are provided in the second heat dissipation plate 24, the second flow channels extend along a second direction Y, and a second inlet and a second outlet of the second flow channels are located at the same end of the second heat dissipation plate 24; the battery pack also includes a second delivery pipe and a second return pipe, the second delivery pipe is connected to the plurality of second inlets, and the second return pipe is connected to the plurality of second outlets.

[0054] The second flow channel in the second heat sink 24 extends along the first direction X (horizontally), and more than three second flow channels are spaced apart along the third direction Z (vertically). Multiple second inlets of more than three second flow channels are integrated at one end of the second heat sink 24, and multiple second outlets of more than three second flow channels are integrated at the same end of the second heat sink 24. The cooling medium is guided to be input through the second inlet of the second flow channel to cool the battery packs on both sides. After passing through the fluid channel, the cooling medium is output from the second outlet of the second flow channel, and then the cooling medium is continuously input for cooling to ensure the cooling effect and efficiency.

[0055] The second inlet and the second outlet of the second flow channel are both at the same end of the second heat sink 24, so the cooling medium can be evenly distributed in the second heat sink 24, and the temperature difference of the cooling medium at both ends of the second heat sink 24 is small, thereby improving the cooling effect of the second heat sink 24. In addition, the second heat sink 24 has more than three second flow channels, which can evenly distribute the cooling medium in the second heat sink 24, so that the cooling medium will not be absent at the top of the second flow channel due to gravity, thereby improving the cooling efficiency of the second heat sink 24 and achieving a better cooling effect.

[0056] Thus, the cooling medium is provided to the second heat sink 24 through the second delivery pipe, and the cooling medium output by the second heat sink 24 is recovered through the second reflux pipe, and the recovered cooling medium is cooled and then input into the second delivery pipe, so that a cycle is formed among the second delivery pipe, the second heat sink 24 and the second reflux pipe, thereby continuously cooling the battery pack and improving the cooling efficiency.

[0057] In addition, an embodiment of the present application also provides an electrical device, including the battery pack as described above.

[0058] The electric equipment is generally a passenger car, and the electric equipment can be a pure electric vehicle or a hybrid electric vehicle, which is not specifically limited here. In general, the battery pack is detachably arranged on the outside of the chassis of the electric equipment, which can lower the center of gravity of the vehicle, which is conducive to improving the comfort of the whole vehicle, saving space in the vehicle and avoiding direct endangerment to the personal safety of passengers in the vehicle when the battery pack is thermally runaway.

[0059] It should be noted that the phrases "one embodiment", "an embodiment", "an exemplary embodiment", "some embodiments", etc. mentioned in the specification indicate that the described embodiments may include certain features, structures or characteristics, but not every embodiment may include the certain features, structures or characteristics. In addition, such phrases do not necessarily refer to the same embodiment. In addition, when describing certain features, structures or characteristics in conjunction with an embodiment, it is within the knowledge of those skilled in the art to implement such features, structures or characteristics in conjunction with other embodiments, whether explicitly or not explicitly described.

[0060] It should be easily understood that “on,” “above,” and “over” in the present disclosure should be interpreted in the broadest manner, so that “on” not only means “directly on something,” but also includes the meaning of “on something” with intervening features or layers therebetween, and “above” or “over” not only includes the meaning of “above” or “over,” but also may include the meaning of “above” or “over something” with no intervening features or layers therebetween (i.e., directly on something).

[0061] In addition, spatially relative terms, such as "below," "below," "beneath," "above," "above," etc., may be used herein for ease of description to describe the relationship of one element or feature relative to other elements or features as shown in the figures. Spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation shown in the figures. The device may have other orientations (rotated 90 degrees or at other orientations), and the spatially relative descriptors used herein may likewise be interpreted accordingly.

[0062] It should be noted that, in this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0063] 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 it. 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 with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery pack, characterized in that: The invention comprises a box (1) and at least one battery pack (2) located in the box (1), wherein the battery pack has a first direction (X), a second direction (Y) and a third direction (Z) which are perpendicular to each other, and the battery pack (2) comprises: A first battery group (21) and a second battery group (22) are arranged along the first direction (X), the first battery group (21) and the second battery group (22) each comprising a plurality of single cells (210), and the plurality of single cells (210) are arranged along the second direction (Y); A heat dissipation assembly is connected to the box body (1), and comprises a first heat dissipation plate (23) and a second heat dissipation plate (24) which are arranged perpendicular to each other, wherein the first heat dissipation plate (23) is located at one end of the first battery group (21) and the second battery group (22) along the third direction (Z), and is connected to the first battery group (21) and the second battery group (22), and the second heat dissipation plate (24) is located between the first battery group (21) and the second battery group (22), and is connected to the first heat dissipation plate (23).

2. The battery pack according to claim 1, characterized in that: An explosion-proof valve (211) is provided at one end of the single battery (210) away from the second heat dissipation plate (24); the two explosion-proof valves (211) located on both sides of the second heat dissipation plate (24) along the first direction (X) are oriented in opposite directions, and a gap is provided between the explosion-proof valve (211) and the box body (1).

3. The battery pack according to claim 2, characterized in that: The single battery (210) comprises a first surface (210a) and a second surface (210b), wherein the first surface (210a) and the second surface (210b) are arranged opposite to each other along the first direction (X); The explosion-proof valve (211) is arranged on the first surface (210a), and the second surface (210b) is connected to the second heat dissipation plate (24).

4. The battery pack according to claim 3, characterized in that: The single battery (210) further comprises two first side surfaces (210c) and two second side surfaces (210d) connected between the first surface (210a) and the second surface (210b); the two first side surfaces (210c) are arranged opposite to each other along the second direction (Y); the two second side surfaces (210d) are arranged opposite to each other along the third direction (Z); the surface area of ​​the first side surface (210c) is greater than the surface area of ​​the second side surface (210d); the first side surface (210c) is arranged perpendicular to the first heat dissipation plate (23) and the second heat dissipation plate (24); the second side surface (210d) is arranged parallel to the first heat dissipation plate (23); and one of the second side surfaces (210d) is connected to the first heat dissipation plate (23).

5. The battery pack according to any one of claims 1 to 4, characterized in that: There are a plurality of battery packs (2), and the plurality of battery packs (2) are arranged at intervals along the first direction (X).

6. The battery pack according to claim 3, characterized in that: The battery pack further comprises a plurality of partitions (3) arranged in the box body (1), wherein the plurality of partitions (3) are arranged at intervals along the first direction (X), and the partitions (3) are located between two adjacent battery packs (2); and a gap is provided between the partitions (3) and the explosion-proof valve (211).

7. The battery pack according to claim 1, characterized in that: A plurality of first flow channels arranged along the first direction (X) are provided in the first heat dissipation plate (23), and the first flow channels extend along the second direction (Y); A plurality of second flow channels arranged along the third direction (Z) are arranged in the second heat dissipation plate (24), and the second flow channels extend along the second direction (Y).

8. The battery pack according to claim 1, characterized in that: The plurality of single cells (210) are respectively bonded and connected to the first heat sink (23) and the second heat sink (24); And / or, the first heat sink (23) and the box (1) are connected via fasteners; And / or, the first heat sink (23) and the second heat sink (24) are connected by bonding or welding.

9. The battery pack according to claim 1, characterized in that: The first heat sink (23) and the second heat sink (24) are both liquid cooling plates, and the thermal conductivity coefficients of the two liquid cooling plates are the same.

10. An electrical device, characterized in that: Comprising a battery pack as described in any one of claims 1 to 9.

Images