Temperature control device, battery assembly and electric equipment

Abstract

The utility model relates to a temperature control device, a battery assembly and electric equipment. The temperature control device comprises a connecting pipe and a plurality of heat exchange units, the multiple heat exchange units are arranged at intervals in the first direction, the space between every two adjacent heat exchange units is suitable for containing a battery cell, and the heat exchange units are suitable for exchanging heat with the battery cells; the heat exchange unit is provided with a containing cavity, and the containing cavity is suitable for containing a heat exchange medium; the containing cavities of every two adjacent heat exchange units communicate with each other through the corresponding connecting pipe. The connecting pipes can elastically stretch out and draw back in the first direction so that the distance between every two adjacent heat exchange units can be adjusted. In the first direction, the battery cell is arranged between the two adjacent heat exchange units, and the temperature control device can exchange heat with the battery cell from the two sides of the battery cell, so that the heat exchange effect with the battery cell is improved, and therefore, when the temperature control device is used for cooling the battery cell, the cooling effect on the battery cell can be improved.

Description

Technical Field

[0001] This utility model belongs to the field of battery technology, and in particular relates to a temperature control device, a battery assembly, and an electrical device. Background Technology

[0002] Lithium-ion batteries can be divided into four main categories: liquid, semi-solid, quasi-solid, and all-solid. All-solid-state batteries represent the next generation of battery cells, but solid-state battery technology is highly complex. Currently, mainstream manufacturers are primarily involved in the mass production of solid-state batteries using semi-solid and quasi-solid-state forms. Moreover, semi-solid and quasi-solid-state batteries will serve as transitional products between liquid and solid-state batteries for a considerable period.

[0003] Semi-solid and quasi-solid batteries have less electrolyte and higher internal resistance for electron flow, resulting in greater heat generation during high-current charging and discharging. To ensure their lifespan and safety, appropriate temperature control devices are needed to cool the battery cells.

[0004] However, in existing technologies, temperature control devices have limited cooling capacity for battery cells, making it difficult to meet heat dissipation requirements. Utility Model Content

[0005] The technical problem to be solved by this utility model is that the existing temperature control device has limited cooling capacity for the battery cell. This utility model provides a temperature control device, a battery assembly, and an electrical device.

[0006] To address the aforementioned problems, this invention provides a temperature control device, comprising a connecting pipe and multiple heat exchange units. The multiple heat exchange units are arranged at intervals along a first direction, and the space between two adjacent heat exchange units is suitable for placing a battery cell. The heat exchange units are adapted to exchange heat with the battery cell. Each heat exchange unit has a receiving cavity adapted to contain a heat exchange medium. The receiving cavities of two adjacent heat exchange units are connected through the connecting pipe. The connecting pipe is elastically expandable and contractable along the first direction to adjust the distance between two adjacent heat exchange units.

[0007] Optionally, the connecting pipe extends along the first direction; in the first direction, at least a portion of the connecting pipe is a corrugated pipe, so that the connecting pipe can elastically expand and contract in the first direction.

[0008] Optionally, in the first direction, the heat exchange unit includes a first plate and a second plate arranged sequentially; in the first direction, the second plate has a first surface close to the first plate; a groove is provided on the first surface; the first plate is connected to the first surface and closes the opening of the groove on the first surface to form the receiving cavity.

[0009] Optionally, in the first direction, the first plate is provided with a first limiting boss on the surface close to the second plate, the first limiting boss is located in the groove; the first limiting boss is spaced apart from the bottom surface of the groove and is spaced apart from the side surface of the groove; and / or, the bottom surface of the groove is provided with a second limiting boss, the second limiting boss is spaced apart from the first plate and is spaced apart from the side surface of the groove.

[0010] Optionally, in the first direction, the second plate further has a second surface away from the first plate; the second plate is used to form the area of the groove, and a protrusion is formed on the second surface; the heat exchange unit further comprises a third plate, the third plate is connected to the side of the second plate away from the first plate and covers the protrusion in the first direction.

[0011] Optionally, in the first direction, the thickness of the first limiting boss is a, the spacing between the bottom surface of the groove and the first plate is A, and the maximum one-way expansion amount allowed by the battery cell in the first direction is D, wherein 1 / 5A≤a

[0012] Optionally, the heat exchange unit further has an input hole and an output hole, the input hole and the output hole are both penetrated by the outer surface of the heat exchange unit to communicate with the accommodation cavity; along the first direction, the accommodation cavities of the heat exchange units are sequentially connected in series; in the two adjacent heat exchange units, the input hole of one heat exchange unit communicates with the output hole of the other heat exchange unit through the connecting pipe; in the first direction, the input hole of one of the two heat exchange units located at the outermost side communicates with the output end of the medium supply device, and the output hole of the other of the two heat exchange units located at the outermost side communicates with the backflow end of the medium supply device.

[0013] To solve the above problems, in another aspect, the utility model provides a battery assembly, including at least one electric core group and at least one temperature control device as described above, the electric core group includes at least one electric core, the electric core is arranged between two adjacent heat exchange units, the temperature control device is multiple, and the fluid channel of each temperature control device is in parallel arrangement, the fluid channel includes the containing cavity and the pipeline of connecting pipe.

[0014] Optionally, the first direction is a direction in which the positive electrode tab of the electric core and the negative electrode tab of the electric core are sequentially and alternately arranged, and / or, in the first direction, the electric core and the heat exchange unit are sequentially and alternately arranged, and the electric core and the heat exchange unit are stacked together.

[0015] Optionally, the battery assembly further comprises a heat exchange plate, the heat exchange plate can exchange heat with the electric core, the electric core and the heat exchange plate are sequentially arranged in a second direction, wherein the second direction intersects the first direction, the heat exchange plate has a flow channel, the flow channel is used for passing fluid into the heat exchange plate and discharging fluid in the heat exchange plate, and the flow channel is in parallel with the fluid channel.

[0016] Optionally, the battery assembly further comprises a separation strip and a heat-conducting adhesive, the separation strip is arranged between the electric core and the heat exchange plate to separate the electric core and the heat exchange plate, and the heat-conducting adhesive is filled between the electric core and the heat exchange plate.

[0017] Optionally, the maximum extension amount of the connecting pipe in the first direction is L, and the maximum one-way expansion amount of the electric core in the first direction is D, wherein L is greater than or equal to 2D.

[0018] To solve the above problems, in another aspect, the utility model provides a battery assembly, including at least one electric core group and at least one temperature control device as described above, the electric core group includes at least one electric core, the electric core is arranged between two adjacent heat exchange units, the temperature control device is multiple, and the fluid channel of each temperature control device is in parallel arrangement, the fluid channel includes the containing cavity and the pipeline of connecting pipe.

[0019] In the temperature control device, the battery assembly and the electric equipment provided in the embodiment of the utility model, in the first direction, the electric core is arranged between two adjacent heat exchange units, the temperature control device can exchange heat with the electric core from both sides of the electric core, thereby improving the heat exchange effect with the electric core, therefore, when the temperature control device of the embodiment is used to cool the electric core, the cooling effect on the electric core can be improved.

[0020] In addition, when the temperature of the electric core changes, it will expand or contract in the first direction, and in the embodiment, the connecting pipe is arranged to be elastically stretchable in the first direction, so that the spacing between the two adjacent heat exchange units is adjustable, which can make the gap between the two adjacent heat exchange units better adapt to the expansion or contraction of the electric core installed therein. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 is an explosion view of the battery assembly provided by an embodiment of the present application;

[0022] Figure 2 is a schematic view of the temperature control device cooperating with the pipeline module provided by an embodiment of the present application;

[0023] Figure 3 is a schematic view of the temperature control device cooperating with the battery cell provided by an embodiment of the present application Figure 1 ;

[0024] Figure 4 is a schematic view of the temperature control device cooperating with the battery cell provided by an embodiment of the present application Figure 2 ;

[0025] Figure 5 is a structural schematic view of the temperature control device provided by an embodiment of the present application;

[0026] Figure 6 is an explosion view of the heat exchange unit provided by an embodiment of the present application;

[0027] Figure 7 is a sectional view of the heat exchange unit provided by an embodiment of the present application;

[0028] Figure 8 is a sectional view of the heat exchange unit provided by another embodiment of the present application;

[0029] Figure 9 is a front view of the second plate of the heat exchange unit provided by another embodiment of the present application;

[0030] Figure 10 is a structural schematic view of the pipeline module provided by an embodiment of the present application;

[0031] Figure 11 is a structural schematic view of the output pipe assembly provided by an embodiment of the present application;

[0032] Figure 12 is a structural schematic view of the return pipe assembly provided by an embodiment of the present application.

[0033] The reference signs in the specification are as follows:

[0034] 100, battery assembly; 10, battery cell; 20, temperature control device; 30, heat exchange plate; 40, isolation strip; 50, heat-conducting glue; 60, outer frame; 70, first cover plate; 80, second cover plate; 90, battery management system;

[0035] 1, connecting pipe;

[0036] 2, heat exchange unit; 21, containing cavity; 22, first plate; 221, first perforation; 23, second plate; 231, first surface; 232, groove; 233, second surface; 234, protrusion; 235, second perforation; 236, top surface; 237, first side surface; 238, second side surface; 239, first slot; 240, second slot; 24, third plate; 241, third perforation; 25, first pipe; 26, second pipe; 27, first limiting boss; 28, second limiting boss;

[0037] 3, clamp;

[0038] 601, first mounting space; 602, second mounting space;

[0039] 41, first frame; 42, second frame; 43, third frame; 44, fourth frame; 45, first partition plate; 46, second partition plate; 47, fifth frame; 48, sixth frame; 49, seventh frame;

[0040] 5, isolation plate; 51, plate body; 52, limiting block;

[0041] 6, pipeline module; 61, output pipe assembly; 611, first joint; 612, second joint; 613, third joint; 614, first output pipe; 615, second output pipe; 616, third output pipe; 617, fourth output pipe; 618, fifth output pipe; 619, sixth output pipe; 62, return pipe assembly; 621, fourth joint; 622, fifth joint; 623, sixth joint; 624, first return pipe; 625, second return pipe; 626, third return pipe; 627, fourth return pipe; 628, fifth return pipe; 629, sixth return pipe; 63, quick connector. DETAILED DESCRIPTION

[0042] In order to make the technical problems, technical schemes and beneficial effects solved by the utility model more clearly understood, the utility model will be further described in detail below in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the utility model, and are not used to limit the utility model.

[0043] As shown in the drawings, Figures 1 to 4 In an embodiment, the battery assembly 100 includes a battery cell 10 and a temperature control device 20. The temperature control device 20 is used for heat exchange with the battery cell 10 to control the temperature of the battery cell 10.

[0044] As shown in the drawings, Figure 5As shown, in an embodiment, the temperature control device 20 comprises the connecting pipe 1 and a plurality of heat exchange units 2; the plurality of heat exchange units 2 are arranged in sequence along the first direction, and the space between two adjacent heat exchange units 2 is suitable for placing the battery cell 10, and the heat exchange unit 2 is suitable for heat exchange (i.e. heat exchange) with the battery cell 10; the heat exchange unit 2 has a containing cavity 21 suitable for containing a heat exchange medium; the containing cavities 21 of two adjacent heat exchange units 2 are communicated through the connecting pipe 1; the connecting pipe 1 can be elastically stretched and contracted along the first direction, so as to adjust the distance between two adjacent heat exchange units 2. "A plurality of" means greater than or equal to two, and the meaning of the word "a plurality of" in each embodiment is the same, and will not be repeated hereinafter.

[0045] In Figures 1 to 5 In the example shown, the first direction is parallel to the X axis.

[0046] In this embodiment, in the first direction, the battery cell 10 is arranged between two adjacent heat exchange units 2, and the temperature control device 20 can exchange heat with the battery cell 10 from both sides of the battery cell 10, thereby improving the heat exchange effect with the battery cell 10, so that when the temperature control device 20 of this embodiment is used to cool the battery cell 10, the cooling effect on the battery cell 10 can be improved. In addition, when the temperature of the battery cell 10 changes, it will expand or contract in the first direction, and in this embodiment, the connecting pipe 1 is arranged to be elastically stretched and contracted in the first direction, so that the distance between two adjacent heat exchange units 2 is adjustable, so that the gap between two adjacent heat exchange units 2 can better adapt to the expansion or contraction of the battery cell 10 installed therein.

[0047] Wherein, the material of the connecting pipe 1 can be rubber, etc., and "the connecting pipe 1 can be elastically stretched and contracted" can mean that after the connecting pipe 1 is stretched, if the tension disappears, the connecting pipe 1 can return to the original length; and after the connecting pipe 1 is compressed, if the pressure disappears, the connecting pipe 1 can also return to the original length.

[0048] In addition, initially, the connecting pipe 1 is in a natural state or in a stretched state; when the temperature of the battery cell 10 rises, it will expand, so that the battery cell 10 will press the heat exchange units 2 on both sides, so that the connecting pipe 1 will be stretched, so that the distance between the two heat exchange units 2 connected with the connecting pipe 1 will increase; when the temperature of the battery cell 10 decreases, it will shrink, at this time, the heat exchange units 2 on both sides of the battery cell 10 will not be pressed by the battery cell 10, so that the connecting pipe 1 will not be pressed by the battery cell 10, so that the connecting pipe 1 will shrink, and then drive the two heat exchange units 2 connected therewith to approach each other, so that the distance between the two heat exchange units 2 is reduced.

[0049] In addition, in actual application scenarios, the heat exchange unit 2 can be used to heat the battery cell 10, or can be used to cool the battery cell 10. The heat exchange medium can be a liquid or a gas, etc.

[0050] It should be understood that when the number of heat exchange units 2 in the temperature control device 20 is greater than or equal to three, the number of connecting pipes 1 is also multiple. Among them, for the same temperature control device 20, the number of connecting pipes 1 it has can be one less than the number of heat exchange units 2 it has.

[0051] In an embodiment, the maximum elongation of the connecting pipe 1 in the first direction is L, and the maximum one-way expansion amount of the battery cell 10 in the first direction is D, wherein L≥2D. In addition, the maximum elongation of the connecting pipe 1 in the first direction means that when the connecting pipe 1 is forced to elongate in the first direction to an amount less than or equal to L, the connecting pipe 1 can return to the initial state after the force on the connecting pipe 1 is removed; but when the connecting pipe 1 is elongated in the first direction to an amount greater than L, the connecting pipe 1 is damaged, and at this time, the connecting pipe 1 cannot automatically return to the initial state after the force on the connecting pipe 1 is removed.

[0052] In an embodiment, the connecting pipe 1 extends along the first direction, wherein the connecting pipe 1 can be a straight pipe, and the axis of the connecting pipe 1 is parallel to the first direction. The two ends of the connecting pipe 1 are connected to the corresponding heat exchange units 2, and the connecting pipe 1 has a certain strength and will not bend and deform in the radial direction of the connecting pipe 1 due to its own gravity. After the connecting pipe 1 is assembled with the heat exchange units 2, the connecting pipe 1 can still maintain the state of a straight pipe, so that the adjacent two heat exchange units 2 cannot move relative to each other in the radial direction of the connecting pipe 1.

[0053] In an embodiment, at least a portion of the connecting pipe 1 in the first direction is a bellows, so that the connecting pipe 1 can be stretched and contracted in the first direction. Among them, the bellows can be stretched and contracted in the first direction, thereby realizing the stretching and contraction of the connecting pipe 1 in the first direction, so that the connecting pipe 1 has better stretching and contraction performance in the first direction.

[0054] In an embodiment, the adjacent two heat exchange units 2 are a first heat exchange unit and a second heat exchange unit, respectively; along the first direction, the connecting pipe 1 includes a first section pipe, a second section pipe and a third section pipe connected in sequence, the first section pipe connects the first heat exchange unit, the third section pipe connects the second heat exchange unit, and the second section pipe is a bellows, so that the second section pipe can be stretched and contracted in the first direction. Among them, the second section pipe can be stretched and contracted in the first direction, thereby realizing the stretching and contraction of the connecting pipe 1 in the first direction. In addition, the first section pipe and the third section pipe can be arranged in a non-bellows type to facilitate connection with the heat exchange unit 2.

[0055] In one embodiment, the heat exchange unit 2 further has an input port and an output port, both of which extend through the outer surface of the heat exchange unit 2 to communicate with the receiving cavity 21; along the first direction, the receiving cavities 21 of each heat exchange unit 2 are connected in series; in two adjacent heat exchange units 2, the input port of one heat exchange unit 2 is connected to the output port of the other heat exchange unit 2 through a connecting pipe 1; in the first direction, the input port of one of the two outermost heat exchange units 2 is connected to the output end of the medium supply device, and the output port of the other of the two outermost heat exchange units 2 is connected to the return end of the medium supply device.

[0056] During operation, the heat exchange medium in the medium supply device can flow out from its output end and sequentially through each heat exchange unit 2, finally flowing back into the medium supply device from its return end. This arrangement allows for the cyclical input of fresh heat exchange medium into the temperature control device 20, improving the heat exchange effect between the temperature control device 20 and the battery cell 10. Specifically, the receiving chambers 21 of each heat exchange unit 2 are connected by connecting pipes 1 to form a fluid channel. The medium supply device can introduce medium into this fluid channel and can collect and recover the medium flowing out of the fluid channel.

[0057] When the heat exchange medium is liquid, the medium supply device may include a water pump and a water tank. The heat exchange medium is stored in the water tank. The output end may be the output port of the water pump, and the return end may be a hole on the water tank or a corresponding pipe connected to the inside of the water tank. Subsequently, the fluid in the temperature control device 20 (i.e., the fluid channel) will return to the water tank from the hole or the pipe.

[0058] In one embodiment, the two outermost heat exchange units 2 defined in the first direction are unit A and unit B, respectively, and each heat exchange unit 2 located between unit A and unit B is unit C. In the first direction, the inlet and outlet ports of unit A and unit C are located on opposite sides of the heat exchange unit 2, while the inlet and outlet ports of unit B are located on the same side of the heat exchange unit 2. This arrangement facilitates connection with a media supply device.

[0059] like Figure 6 and Figure 7 As shown, in one embodiment, in a first direction, the heat exchange unit 2 includes a first plate 22 and a second plate 23 arranged sequentially; in the first direction, the second plate 23 has a first surface 231 close to the first plate 22; a groove 232 is provided on the first surface 231; the first plate 22 is connected to the first surface 231 and closes the opening of the groove 232 on the first surface 231 to form a receiving cavity 21.

[0060] In an embodiment, the surface of the first plate 22 close to the second plate 23 is overlapped with the first surface 231. Wherein, the first surface 231 is a plane, and the surface of the first plate 22 close to the second plate 23 is also a plane. Alternatively, the surface of the first plate 22 close to the second plate 23 and the first surface 231 can also be arc surfaces, etc.

[0061] As shown in the drawings, in an embodiment, in the first direction, the second plate 23 further has a second surface 233 facing away from the first plate 22; the area of the second plate 23 for forming the groove 232 forms a protrusion 234 on the second surface 233; the heat exchange unit 2 further comprises a third plate 24 connected to the side of the second plate 23 facing away from the first plate 22 and covering the protrusion 234 in the first direction. Figure 7

[0062] Wherein, the second plate 23 can be a punched plate, and the protrusion 234 is formed on the second surface 233 at the same time when the groove 232 is formed on the first surface 231, so that the area of the second plate 23 for forming the groove 232 forms the protrusion 234 on the second surface 233.

[0063] The third plate 24 covering the protrusion 234 in the first direction can mean that in the orthographic projection of a plane perpendicular to the first direction (the plane is defined as the first plane), the projection of the third plate 24 at least partially overlaps the projection of the protrusion 234.

[0064] Wherein, in the first direction, the third plate 24 can completely cover the protrusion 234, or the third plate 24 can partially cover the protrusion 234.

[0065] When the third plate 24 completely covers the protrusion 234, the orthographic projection of the third plate 24 on the first plane completely covers the orthographic projection of the protrusion 234 on the first plane.

[0066] When the third plate 24 partially covers the protrusion 234, the orthographic projection of the third plate 24 on the first plane partially covers the orthographic projection of the protrusion 234 on the first plane.

[0067] In an embodiment, in the orthographic projection on the first plane, the projection of the third plate 24 completely covers the projection of the second plate 23.

[0068] In addition, in use, the surface of the first plate 22 facing away from the second plate 23 and the surface of the third plate 24 facing away from the second plate 23 can be attached to the battery cell 10 (i.e., overlapped with the outer surface of the battery cell 10), which is conducive to achieving uniform heating or uniform cooling of each area of the battery cell 10 and effectively avoiding damage to the battery cell 10 due to temperature differences in each area.

[0069] ​In one embodiment, the surface of the first plate 22 facing away from the second plate 23 is flat, the surface of the third plate 24 facing away from the second plate 23 is flat, and the surface of the battery cell 10 that is in contact with these two surfaces is also flat, which makes it easier for the first plate 22 and the third plate 24 to adhere to the battery cell 10.

[0070] like Figure 5 As shown, in one embodiment, for units A and C, heat exchange unit 2 further includes a first tube 25 and a second tube 26, a first through hole 221 is provided on the first plate 22, a second through hole 235 is provided on the second plate 23, and a third through hole 241 is provided on the third plate 24; wherein, in a first direction, the first through hole 221 penetrates the first plate 22, the second through hole 235 penetrates the second plate 23 through the bottom surface of the groove 232, and the third through hole 241 penetrates the third plate 24.

[0071] The first tube 25 is connected to the first plate 22 and communicates with the first through hole 221; the second tube 26 is connected to the third plate 24 and communicates with the third through hole 241. After assembly, the first through hole 221 communicates with the groove 232, and the second through hole 235 communicates with the third through hole 241, so that both the first tube 25 and the second tube 26 are connected to the groove 232.

[0072] The first tube 25 and the first perforation 221 are connected to form an output port, and the second tube 26, the third perforation 241, and the second perforation 235 are connected to form an input port. After assembly, the connecting tube 1 can be sleeved on the first tube 25 of the first heat exchange unit and on the second tube 26 of the second heat exchange unit. Alternatively, the connecting tube 1 can be locked onto the first tube 25 by clamp 3, and simultaneously, the connecting tube 1 can be locked onto the second tube 26 by clamp 3.

[0073] For unit B, heat exchange unit 2 also includes a first tube 25 and a second tube 26. However, in addition to the first through hole 221, the first plate 22 also has a fourth through hole, which penetrates the first plate 22 in the first direction. The first through hole 221 and the fourth through hole are spaced apart. At this time, the second plate 23 does not have a second through hole 235, and the third plate 24 does not have a third through hole 241. The first tube 25 and the second tube 26 are both located on the first plate 22 and on the surface of the first plate 22 facing away from the second plate 23. The first tube 25 is connected to the first through hole 221, and the second tube 26 is connected to the fourth through hole. Both the first through hole 221 and the fourth through hole are connected to the groove 232.

[0074] In an embodiment, the first plate 22 and the third plate 24 can each be a flat plate structure, in the first direction, the surface of the first plate 22 close to the third plate 24 and the surface of the first plate 22 away from the third plate 24 can each be a plane, the surface of the third plate 24 close to the first plate 22 and the surface of the third plate 24 away from the first plate 22 can each be a plane, and the first surface 231 and the second surface 233 can each be a plane.

[0075] As shown in FIG. 1, in an embodiment, in the first direction, the first plate 22 is provided with a first limiting boss 27 on the surface close to the second plate 23, and the first limiting boss 27 is located in the groove 232. Figure 7

[0076] When the battery cell 10 expands, it will press the second plate 23, which can cause the bottom surface of the groove 232 to contact the first plate 22, thereby causing the accommodation cavity 21 to be blocked and separated. The arrangement of the first limiting boss 27 can effectively prevent this situation. Moreover, when the battery cell 10 expands, it will press the protrusion 234, causing the bottom surface of the groove 232 to be close to the first plate 22. When the bottom surface of the groove 232 comes into contact with the first limiting boss 27, it can block the expansion of the battery cell 10 in the first direction.

[0077] In an embodiment, the first limiting boss 27 can be a rectangular block or a spherical segment structure. As a preferred embodiment, the first limiting boss 27 is a spherical segment structure, and the top surface 236 of the spherical segment structure is connected to the first plate 22, which can reduce the hindrance to the flow of fluid in the accommodation cavity 21. Of course, in other embodiments, the first limiting boss 27 can also be a regular structure such as a trapezoidal block, or the first limiting boss 27 can also be an irregular structure, which is not limited in the present embodiment.

[0078] In other embodiments, other ways can also be used to avoid the accommodation cavity 21 being blocked and separated, for example, as shown in FIGS. 2 and 3, the bottom surface of the groove 232 is provided with a second limiting boss 28, and the second limiting boss 28 is spaced apart from the first plate 22 and the side surface of the groove 232. Of course, in other embodiments, the first limiting boss 27 can be provided on the first plate 22, and the second limiting boss 28 can also be provided on the bottom surface of the groove 232. In the first direction, the first limiting boss 27 and the second limiting boss 28 are spaced apart. Figure 8 Figure 9

[0079] As shown in FIG. 1, in an embodiment, in the first direction, the first plate 22 is provided with a first limiting boss 27 on the surface close to the second plate 23, and the first limiting boss 27 is located in the groove 232. Figure 7 ​​​As shown, in one embodiment, the thickness of the first limiting boss 27 in the first direction is 'a', and the distance between the bottom surface of the groove 232 and the first plate 22 is 'A', where 1 / 5A ≤ a < A; preferably, 1 / 3A ≤ a ≤ 1 / 2A. This ensures smooth fluid flow within the groove 232 and effectively limits the expansion of the battery cell 10. Furthermore, A ≥ 2D.

[0080] 'a' can refer to the maximum thickness of the first limiting boss 27 in the first direction.

[0081] A can refer to the minimum distance between the bottom surface of the groove 232 and the first plate 22 in the first direction.

[0082] like Figure 7 As shown, in one embodiment, in the second direction, the width of the groove 232 is B, and the width of the first limiting boss 27 is b, where 0.25B ≤ b < B, thus ensuring smooth fluid flow within the groove 232. The second direction intersects the first direction, and the second direction can be perpendicular to the first direction. When the temperature control device 20 is applied to a vehicle, the first direction is the vehicle's longitudinal direction, and the second direction is the vehicle's vertical direction. Figures 1 to 5 In the example shown, the second direction is parallel to the Z-axis.

[0083] b can refer to the maximum width of the first limiting boss 27 in the second direction.

[0084] B can refer to the minimum width of the groove 232 in the second direction.

[0085] like Figure 7 As shown, in one embodiment, in the first direction, the thickness of the first plate 22 is h1, the thickness of the second plate 23 is h2, and the thickness of the third plate 24 is h3, where h2 > h1, h2 > h3, and 0.8h1 ≤ h3 ≤ 1.2h1. The thickness of the second plate 23 refers to the distance between the first surface 231 and the second surface 233 in the first direction.

[0086] like Figure 7 As shown, in one embodiment, the protrusion 234 has a top surface 236, a first side surface 237, and a second side surface 238. In the second direction, the first side surface 237 and the second side surface 238 are two opposing surfaces of the protrusion 234. The first side surface 237 and the second side surface 238 are located on both sides of the top surface 236, and both the first side surface 237 and the second side surface 238 intersect at the second surface 233. The included angle between the first side surface 237 and the second surface 233 is θ1, and the included angle between the second side surface 238 and the second surface 233 is θ2, where 90° < θ1 ≤ 165° and 90° < θ2 ≤ 165°. Preferably, θ1 = θ2, and 120° ≤ θ1 ≤ 150°.

[0087] In addition, the top surface 236 is parallel to the bottom surface of the groove 232 and parallel to the second surface 233. The first side surface 237 intersects the second surface 233 and the top surface 236, and the second side surface 238 intersects the second surface 233 and the top surface 236.

[0088] like Figure 9 As shown, in one embodiment, the groove 232 has a bent structure, comprising a first groove 239 and a second groove 240. The first groove 239 extends along a third direction, and there are multiple first grooves 239, which are sequentially spaced along a second direction. The second groove 240 extends along the second direction and is used to connect adjacent first grooves 239. The third direction, the second direction, and the first direction intersect each other; preferably, they are perpendicular to each other. In this case, the third direction can be the width direction of the vehicle. Figures 1 to 5 In the example shown, the third direction is parallel to the Y-axis.

[0089] Furthermore, in the second direction, the two ends of two adjacent first slots 239 can be connected by a second slot 240. Additionally, in the third direction, the second slot 240 is located on one side of the first slot 239 it connects to.

[0090] In one embodiment, the first direction is the direction in which the positive and negative electrode sheets of the battery cell 10 are alternately stacked. The thickness directions of both the positive and negative electrode sheets are the first direction, and the thickness direction of the positive electrode sheet is the thickness direction of the battery cell 10. In actual products, both the positive and negative electrode sheets are thin-film structures; therefore, the two outer surfaces of the battery cell 10 in the first direction constitute a large area of ​​the battery cell 10, which improves the heat exchange effect between the temperature control component and the battery cell 10.

[0091] Furthermore, the battery cell 10 can be a rectangular structure, and the battery cell 10 has a first outer surface, a second outer surface, a third outer surface, a fourth outer surface, a fifth outer surface, and a sixth outer surface, all of which can be planar. Specifically, the first and second outer surfaces are parallel and spaced apart, the third and fourth outer surfaces are parallel and spaced apart, and the fifth and sixth outer surfaces are parallel and spaced apart. The first and second outer surfaces intersect at the third, fourth, fifth, and sixth outer surfaces. Additionally, the third and fourth outer surfaces intersect at the fifth and sixth outer surfaces.

[0092] The first outer surface and the second outer surface are arranged at intervals along the first direction. The first outer surface and the second outer surface have the same area. The third outer surface and the fourth outer surface have the same area. The fifth surface and the sixth outer surface have the same area. The area of ​​the first outer surface is greater than the area of ​​the third outer surface and the area of ​​the fifth outer surface. The first outer surface and the second outer surface constitute the large format of the battery cell 10.

[0093] In one embodiment, the battery cell 10 is stacked together with the heat exchange unit 2, and in a first direction, the battery cell 10 and the heat exchange unit 2 are arranged alternately. That is, a battery cell 10 is arranged between two adjacent heat exchange units 2, and the battery cell 10 is stacked together with the two heat exchange units 2 on its two sides. This can further improve the heat exchange effect between the temperature control device 20 and the battery cell 10.

[0094] After the battery assembly 100 is assembled, the surface of the heat exchange unit 2 near the cell 10 coincides with the surface of the cell 10 near the heat exchange unit 2, which helps to increase the heat exchange effect between the two. Specifically, the surface of the heat exchange unit 2 near the cell 10 is planar, and the surface of the cell 10 near the heat exchange unit 2 is also planar. For example, the surfaces of the first plate 22 away from the third plate 24 and the third plate 24 away from the first plate 22 are both planar. After assembly, the surface of the first plate 22 near the third plate 24 (or the surface of the third plate 24 near the first plate 22) can coincide with the first outer surface (or the second outer surface) of a cell 10.

[0095] like Figure 1 and Figure 2 As shown, in one embodiment, the battery assembly 100 further includes a heat exchange plate 30, which is capable of exchanging heat with the battery cell 10; the battery cell 10 and the heat exchange plate 30 are arranged sequentially in a second direction. This arrangement can further improve the heat exchange effect between the battery cell 10 and the outside. The second direction can be the height direction of the battery cell 10.

[0096] In one embodiment, the heat exchange plate 30 has corresponding flow channels for allowing external fluid to enter the flow channels (i.e., enter the heat exchange plate 30) and for discharging external fluid from the heat exchange plate 30, meaning that external fluid can pass through the heat exchange plate 30 from the flow channels. The flow channels of the heat exchange plate 30 are connected in parallel with the fluid channels of the temperature control device 20.

[0097] like Figure 2 As shown, in one embodiment, the battery assembly 100 further includes a separator 40 and thermally conductive adhesive 50; the separator 40 is disposed between the battery cell 10 and the heat exchange plate 30 to separate the battery cell 10 and the heat exchange plate 30; the thermally conductive adhesive 50 is filled between the battery cell 10 and the heat exchange plate 30.

[0098] The isolation strip 40 separates the battery cell 10 and the heat exchange plate 30, so that the battery cell 10 does not press the heat-conducting glue 50, and the heat-conducting glue 50 can be filled between the battery cell 10 and the heat exchange plate 30.

[0099] In addition, the isolation strip 40 is also located between the temperature control device 20 and the heat exchange plate 30 to separate the temperature control device 20 and the heat exchange plate 30, so that the temperature control device 20 does not press the heat-conducting glue 50, and the heat-conducting glue 50 can be filled between the battery cell 10 and the heat exchange plate 30. Specifically, the isolation strip 40 is actually arranged between the heat exchange unit 2 and the heat exchange plate 30.

[0100] In an embodiment, the number of isolation strips 40 can be two, and the two isolation strips 40 are arranged at intervals along a third direction. The two ends of the battery cell 10 are respectively placed on the two isolation strips 40, and the third direction can be the length direction of the battery cell 10.

[0101] In actual products, the battery cell 10 can form a battery cell group, and at least one battery cell 10 is included in one battery cell group. At least one battery cell group is included in one battery assembly 100. Each battery cell 10 in one battery cell group can be separated from the heat exchange plate 30 by the two isolation strips 40. Each battery cell 10 in one battery cell group is provided with a heat exchange unit 2 on both sides and contacts the two heat exchange units 2.

[0102] In addition, the number of temperature control devices 20 included in one battery assembly 100 can also be at least one. One battery cell group cooperates with one temperature control device 20 to form one battery module. Specifically, each battery cell 10 in one battery cell group is located between the corresponding heat exchange units 2 in one temperature control device 20. Specifically, in one temperature control device 20, there is an installation cavity between two adjacent heat exchange units 2, and one battery cell 10 is arranged in one installation cavity. When only one battery cell 10 is arranged between two adjacent heat exchange units 2, the number of heat exchange units 2 in one temperature control device 20 can be one more than the number of battery cells 10 in the battery cell group cooperating with it.

[0103] When the number of temperature control devices 20 included in one battery assembly 100 is multiple, the fluid channels of the temperature control devices 20 can be arranged in parallel. The fluid channel of one temperature control device 20 includes the containing cavity 21 in the temperature control device and the pipeline of the connecting pipe 1, that is, the pipeline of each connecting pipe 1 and the containing cavity 21 of each heat exchange unit 2 together form the fluid channel of the temperature control device 20. Among them, the connecting pipe 1 communicating with the containing cavity 21 means that the pipeline of the connecting pipe 1 communicates with the containing cavity 21.

[0104] In one embodiment, in a battery assembly 100, when there are multiple temperature control devices 20 and multiple battery cell groups, one temperature control device 20 corresponds to one battery cell group, and each battery cell 10 in a battery cell group is located between the corresponding heat exchange units 2 in its corresponding temperature control device 20.

[0105] like Figure 1 As shown, in one embodiment, the battery assembly 100 further includes an outer frame 60, a first cover plate 70, and a second cover plate 80. The outer frame 60 has a first mounting space 601, which is a cavity structure with openings at both ends. Specifically, in a second direction, the first mounting space 601 extends through the outer frame 60. The first cover plate 70 and the second cover plate 80 are both connected to the outer frame 60 and respectively close the openings at both ends of the first mounting space 601. The battery cell 10 and the temperature control device 20 are both installed in the first mounting space 601 and located between the first cover plate 70 and the second cover plate 80. The outer frame 60 can be used to limit the maximum expansion of the battery cell 10.

[0106] Alternatively, the heat exchange plate 30 may be disposed between the battery cell 10 and the first cover plate 70. When the battery assembly 100 is used in a vehicle, the first cover plate 70 may be located below the second cover plate 80.

[0107] When the battery assembly 100 includes multiple temperature control devices 20 and multiple battery cell packs, the battery assembly 100 also includes a separator plate. The separator plate is disposed in the first mounting space 601 and is used to divide the first mounting space 601 into multiple subspaces. One temperature control device 20 and one battery cell pack can be installed in one subspace.

[0108] exist Figure 1 In the example shown, there are two partitions, which are arranged in an intersecting manner to divide the first installation space 601 into four subspaces.

[0109] like Figure 1 As shown, in one embodiment, the outer frame 60 includes a first border 41, a second border 42, a third border 43, and a fourth border 44, which together form a first mounting space 601. Specifically, the first border 41 and the second border 42 are spaced apart, the third border 43 and the fourth border 44 are spaced apart, the two ends of the first border 41 are connected to the third border 43 and the fourth border 44 respectively, and the two ends of the second border 42 are connected to the third border 43 and the fourth border 44 respectively.

[0110] Additionally, the first frame 41 and the second frame 42 are spaced apart along a first direction, and the third frame 43 and the fourth frame 44 are spaced apart along a third direction. The first frame 41 and the second frame 42 are used to limit the maximum expansion amount of the cell 10 in the first direction.

[0111] At this time, the two partitions are the first partition 45 and the second partition 46 respectively; the two ends of the first partition 45 are connected to the first frame 41 and the second frame 42 respectively, and the first partition 45 is spaced between the third frame 43 and the fourth frame 44; the two ends of the second partition 46 are connected to the third frame 43 and the fourth frame 44 respectively, and the first partition 45 is spaced between the first frame 41 and the second frame 42.

[0112] like Figure 1 As shown, in one embodiment, the outer frame 60 further has a second mounting space 602, wherein the second mounting space 602 and the first mounting space 601 are spaced apart, and the second mounting space 602 extends through the outer frame 60 in a second direction. The second mounting space 602 is used to accommodate a battery management system 90, which is used to control the operation of the battery cell 10.

[0113] like Figure 1 As shown, the second mounting space 602 and the first mounting space 601 are arranged at intervals in the first direction. The outer frame 60 further includes a fifth frame 47, a sixth frame 48, and a seventh frame 49. The fifth frame 47 and the sixth frame 48 are spaced apart along the third direction. The fifth frame 47 is connected to the third frame 43, the sixth frame 48 is connected to the fourth frame 44, and the two ends of the seventh frame 49 are connected to the fifth frame 47 and the sixth frame 48, respectively. Furthermore, in the first direction, the fifth frame 47, the sixth frame 48, and the seventh frame 49 are all located on the side of the first frame 41 facing away from the second frame 42. The seventh frame 49 and the first frame 41 are spaced apart along the first direction. The first frame 41, the fifth frame 47, the sixth frame 48, and the seventh frame 49 enclose and form the second mounting space 602.

[0114] After assembly, the first cover plate 70 and the second cover plate 80 also close the openings at both ends of the second mounting space 602 in the second direction.

[0115] like Figure 3 and Figure 4 As shown, in one embodiment, the battery assembly 100 further includes a separator 5, which is disposed between the temperature control device 20 and the outer frame 60 to prevent direct contact between the temperature control device 20 and the outer frame 60. There may be two separators 5, located on opposite sides of the temperature control device 20 in a first direction. Alternatively, the separator 5 may be an insulating plate.

[0116] like Figure 3 As shown, in one embodiment, the isolation plate 5 includes a plate body 51 and a limiting block 52. The limiting block 52 is disposed on the plate body 51. After assembly, the plate body 51 is located between the temperature control device 20 and the limiting block 52, that is, the limiting block 52 is located on the side of the plate body 51 away from the temperature control device 20.

[0117] When assembling the battery assembly 100, the battery cell group and the temperature control device 20 can be assembled together first. Then, two isolation plates 5 are connected to both sides of the temperature control device 20 to form a battery unit. Then, a robotic arm is used to hold the battery unit and place it in the first mounting space 601. The robotic arm can be pressed against the plate 51 to prevent the robotic arm from scratching the outer frame 60.

[0118] In one embodiment, a partition plate 5 may have multiple limiting blocks 52, each limiting block 52 being spaced apart along a third direction on the plate body 51 and all located on the same side of the plate body 51.

[0119] like Figure 2 and Figure 10 As shown, in one embodiment, the battery assembly 100 further includes a pipe module 6 for connecting the fluid channel of the temperature control device 20 and the medium supply device.

[0120] like Figure 10 As shown, the pipeline module 6 includes an output pipe assembly 61 and a return pipe assembly 62. The output pipe assembly 61 is used to connect the output end of the medium supply device and the fluid channel input end of the temperature control device 20, and the return pipe assembly 62 is used to connect the return end of the medium supply device and the fluid channel output end of the temperature control device 20.

[0121] exist Figure 2 In the example shown, the battery assembly 100 has four temperature control devices 20, at which point, such as Figure 11As shown, the output pipe assembly 61 includes a first connector 611, a second connector 612, a third connector 613, a first output pipe 614, a second output pipe 615, a third output pipe 616, and a fourth output pipe 617; wherein, the first connector 611, the second connector 612, and the third connector 613 are all tee connectors; the first connector 611 is connected to one end of the first output pipe 614 and one end of the second output pipe 615, and the fluid passage of the first output pipe 614 is connected in parallel with the fluid passage of the second output pipe 615; the other end of the first output pipe 614 is connected to the second connector 612, so that the fluid passage of the first output pipe 614 is divided and connected through the second connector 612. The second output pipe 615 is connected to two sub-paths; the other end of the second output pipe 615 is connected to the third connector 613, and the third connector 613 is connected to the third output pipe 616 and the fourth output pipe 617 respectively, so that the passage of the second output pipe 615 is divided into two parallel sub-paths through the third connector 613. These two sub-paths are the passage of the third output pipe 616 and the passage of the fourth output pipe 617 respectively. In this way, the output pipe assembly 61 can divide one passage into four parallel sub-paths. These four passages are respectively connected to the fluid channels of the four temperature control devices 20. During operation, the medium supply device can simultaneously supply fluid into the fluid channels of the four temperature control devices 20 from the first connector 611.

[0122] In addition, such as Figure 2 As shown, the output tube assembly 61 also includes a fifth output tube 618 and a sixth output tube 619. The fifth output tube 618 and the sixth output tube 619 are respectively connected to the second connector 612. After the medium in the first output tube 614 passes through the second connector 612, it flows to the fifth output tube 618 and the sixth output tube 619 respectively, and from the fifth output tube 618 and the sixth output tube 619 to the corresponding temperature control device 20.

[0123] like Figure 12As shown, the reflux pipe assembly 62 includes a fourth connector 621, a fifth connector 622, a sixth connector 623, a first reflux pipe 624, a second reflux pipe 625, a third reflux pipe 626, and a fourth reflux pipe 627; wherein, the fourth connector 621, the fifth connector 622, and the sixth connector 623 are all tee connectors; the fourth connector 621 is connected to one end of the first reflux pipe 624 and one end of the second reflux pipe 625, and the fluid passages of the first reflux pipe 624 and the second reflux pipe 625 are connected in parallel; the other end of the first reflux pipe 624 is connected to the fifth connector 622, so that the fluid passages of the first reflux pipe 624 are divided into two parallel connections through the fifth connector 622. The second return pipe 625 has one sub-passage; the other end of the second return pipe 625 is connected to the sixth connector 623, and the sixth connector 623 is connected to the third return pipe 626 and the fourth return pipe 627 respectively, so that the passage of the second return pipe 625 is divided into two parallel sub-passages through the sixth connector 623. These two sub-passages are the passage of the third return pipe 626 and the passage of the fourth return pipe 627 respectively. During operation, the return pipe assembly 62 can be formed by connecting four sub-passages in parallel into one passage. These four sub-passages are respectively connected to the fluid channels of the four temperature control components. The medium in each fluid channel can return to the fourth connector 621 through the four sub-passages respectively, and then return to the medium supply device from the fourth connector 621.

[0124] In addition, such as Figure 2 As shown, the reflux pipe assembly 62 also includes a fifth reflux pipe 628 and a sixth reflux pipe 629. The fifth reflux pipe 628 and the sixth reflux pipe 629 are respectively connected to the fifth connector 622. The medium in the corresponding temperature control device 20 flows into the fifth reflux pipe 628 and the sixth reflux pipe 629 respectively, and then converges into the first reflux pipe 624 through the fifth connector 622, and then flows back to the medium supply device from the first reflux pipe 624.

[0125] like Figure 10 As shown, in one embodiment, the pipe module 6 further includes a quick-connect plug 63. The quick-connect plug 63 is used to achieve series connection between different pipes. The quick-connect plug 63 may have multiple channels spaced apart from each other, each channel enabling series connection between two pipes.

[0126] This utility model embodiment also provides an electrical device, which includes the battery assembly 100 described in any of the above embodiments. The electrical device can be a vehicle, aircraft, etc.

[0127] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0128] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A temperature control device, characterized by, The connecting pipe and the plurality of heat exchange units are included; The plurality of heat exchange units are arranged along a first direction, and a space between two adjacent heat exchange units is suitable for placing a battery cell, and the heat exchange unit is suitable for heat exchange with the battery cell; The heat exchange unit has a containing cavity suitable for containing a heat exchange medium; The containing cavities of two adjacent heat exchange units are communicated through the connecting pipe; The connecting pipe can be elastically stretched and contracted along the first direction, so as to adjust the distance between two adjacent heat exchange units.

2. The temperature control device of claim 1, wherein The connecting pipe extends along the first direction; at least a part of the connecting pipe is a bellows in the first direction, so that the connecting pipe can be elastically stretched and contracted in the first direction.

3. The temperature control device of claim 1, wherein, In the first direction, the heat exchange unit includes a first plate and a second plate arranged in sequence; In the first direction, the second plate has a first surface close to the first plate; The first surface is provided with a groove; The first plate is connected to the first surface and closes the opening of the groove on the first surface to form the containing cavity.

4. The temperature control device of claim 3, wherein In the first direction, the first plate is provided with a first limiting boss on the surface close to the second plate, and the first limiting boss is located in the groove; the first limiting boss is spaced apart from the bottom surface of the groove and spaced apart from the side surface of the groove; and / or, The bottom surface of the groove is provided with a second limiting boss, and the second limiting boss is spaced apart from the first plate and spaced apart from the side surface of the groove.

5. The temperature control device of claim 4, wherein, In the first direction, the second plate further has a second surface away from the first plate; The second plate is used to form the area of the groove, and a protrusion is formed on the second surface; The heat exchange unit further includes a third plate connected to the side of the second plate away from the first plate and covering the protrusion in the first direction.

6. The temperature control device of claim 5, wherein, In the first direction, the thickness of the first limiting boss is a, the distance between the bottom surface of the groove and the first plate is A, and the maximum one-way expansion amount of the battery cell in the first direction is D, wherein 1 / 5A≤a<A; A≥2D; and / or, In the second direction, the width of the groove is B, and the width of the first limiting boss is b, 0.25B≤b<B, wherein the second direction is perpendicular to the first direction; and / or, In the first direction, the thickness of the first plate is h1, the thickness of the second plate is h2, and the thickness of the third plate is h3, h2>h1, h2>h3, 0.8h1≤h3≤1.2h1; and / or, In the second direction, the protrusion has a first side surface and a second side surface arranged opposite to each other, the first side surface and the second side surface both intersect with the second surface, the included angle between the first side surface and the second surface is θ1, the included angle between the second side surface and the second surface is θ2, 90°<θ1≤165°, 90°<θ2≤165°, wherein the second direction is perpendicular to the first direction.

7. The temperature control device of claim 1, wherein The heat exchange unit further has an input hole and an output hole, both of which are penetrated by the outer surface of the heat exchange unit to communicate with the containing cavity; The containing cavities of the heat exchange units are sequentially connected in series along the first direction; The input hole of one of the two adjacent heat exchange units communicates with the output hole of the other heat exchange unit through the connecting pipe; In the first direction, the input hole of one of the two outermost heat exchange units communicates with the output end of the medium supply device, and the output hole of the other of the two outermost heat exchange units communicates with the return end of the medium supply device.

8. A battery assembly characterized by, The temperature control device comprises at least one battery cell group and at least one temperature control device according to any one of claims 1-7. The battery cell group comprises at least one battery cell, which is arranged between two adjacent heat exchange units. When the temperature control device is multiple, the fluid channels of the temperature control devices are arranged in parallel. The fluid channel comprises the containing cavity and the connecting pipe.

9. The battery assembly of claim 8, wherein, The first direction is the direction in which the positive electrode plate of the battery cell and the negative electrode plate of the battery cell are sequentially and alternately arranged, and / or In the first direction, the battery cell and the heat exchange unit are sequentially and alternately arranged. The battery cell and the heat exchange unit are stacked together.

10. The battery assembly of claim 8, wherein, The battery assembly further comprises a heat exchange plate, which can exchange heat with the battery cell; The battery cell and the heat exchange plate are sequentially arranged in a second direction, wherein the second direction intersects the first direction; The heat exchange plate has a flow channel for passing fluid into the heat exchange plate and discharging fluid from the heat exchange plate; The flow channel is in parallel with the fluid channel.

11. The battery assembly of claim 10, wherein, The battery assembly further comprises a separation strip and a heat-conducting adhesive; The separation strip is arranged between the battery cell and the heat exchange plate to separate the battery cell and the heat exchange plate; The heat-conducting adhesive is filled between the battery cell and the heat exchange plate.

12. The battery assembly of claim 8, wherein, The maximum extension of the connecting pipe in the first direction is L, and the maximum one-way expansion of the battery cell in the first direction is D, wherein L≥2D.

13. An electrical device, characterized by The battery assembly comprises any one of claims 8-12.

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