Battery components and electrical equipment

Abstract

A battery assembly includes a shell, a cell assembly and an adapter plate. The cell assembly is arranged in the shell, and includes a plurality of cell units, and the plurality of cell units are stacked along a first direction. The cell units include a first cell, a second cell and a flow guide, the flow guide is arranged between the first cell and the second cell, and a flow channel is provided in the flow guide, and the opposite ends of the flow channel are respectively connected to the first opening and the second opening of the shell. The adapter plate is arranged between the shell and the cell assembly, and a first channel is formed between the adapter plate and the shell, and the first channel is connected to the first opening. The adapter plate is provided with a plurality of through holes, and the through holes are connected to the first channel and the flow channel. Along the first direction, the area of ​​at least part of the through holes gradually increases, which is conducive to reducing the problems of local excessive temperature and uneven temperature rise, and improving the safety performance of the battery assembly. The present application also provides an electrical device having the above-mentioned battery assembly.

Description

Technical Field

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

[0002] With the development of the new energy industry, lithium batteries are increasingly being used. However, lithium batteries tend to generate a lot of heat during high-rate charge and discharge. Because existing batteries lack heat dissipation structures and have poor heat dissipation performance, this can easily lead to localized overheating and thermal runaway, impacting battery performance and safety. Summary of the Invention

[0003] In view of the above situation, the present application provides a battery assembly and electrical equipment. By setting a guide structure between every two battery cells and setting through holes with gradually increasing areas on the adapter plate, the flow rate of the cooling medium in the guide members at different positions does not decrease with the flow distance, thereby improving the heat dissipation performance of the battery assembly, reducing the problems of local excessive temperature, uneven temperature rise, and thermal runaway, and improving the safety performance of the battery assembly.

[0004] An embodiment of the present application provides a battery assembly, comprising a cell assembly and a shell, wherein the cell assembly comprises a plurality of cell units, wherein the plurality of cell units are stacked along a first direction, wherein the shell is disposed around the cell assembly, and wherein a first opening and a second opening are provided at opposite ends of the shell along the first direction. The cell units comprise a first cell, a second cell, and a flow guide, wherein the flow guide is disposed between the first cell and the second cell. The battery assembly further comprises an adapter plate, wherein the adapter plate is disposed between the shell and the cell assembly, wherein a first channel is formed between the adapter plate and the shell, and wherein the first channel is connected to the first opening. A flow channel is provided within the flow guide, and a plurality of through holes are provided on the adapter plate, wherein the through holes connect the first channel and the flow channel; and the flow channel is connected to the second opening. Along the first direction, the area of ​​at least some of the through holes gradually increases.

[0005] The through holes ensure that the flow rate of the cooling medium in the guide members at different positions does not decrease with the flow distance, thereby improving the heat dissipation performance of the battery assembly, reducing the problems of local excessive temperature, uneven temperature rise, and thermal runaway, and improving the safety performance of the battery assembly.

[0006] In some embodiments, the area of ​​the through hole gradually increases along the first direction.

[0007] In some embodiments, the guide member includes a hollow aluminum plate to further improve heat dissipation.

[0008] In some embodiments, the first battery cell is in contact with and connected to one side of the flow guide, and the second battery cell is in contact with and connected to the other side of the flow guide.

[0009] In some embodiments, a second channel is formed between the adapter plate and the battery core assembly, the second channel is connected to the plurality of flow channels, the cooling medium flows from the first opening into the second channel, and then is diverted to the plurality of guide members.

[0010] In some embodiments, the amount of cooling medium passing through the through-hole per unit time is the flow rate of the through-hole, and the flow rate of the through-hole gradually increases along the first direction. Furthermore, the amount of cooling medium passing through the guide member per unit time is substantially the same, which is conducive to improving uniform heat dissipation of the battery.

[0011] In some embodiments, along the third direction, the inner side wall of the shell is provided with a recess, the sides of the first battery cell and the second battery cell are accommodated in the recess, and the first direction and the third direction are perpendicular to each other.

[0012] In some embodiments, along the second direction, the outer side wall of the housing is provided with a plurality of heat dissipation fins.

[0013] In some embodiments, the battery cell assembly further includes a plurality of first buffer members, each of which is disposed between any adjacent battery cell units. The buffer members can be compressed when the battery cell expands, thereby providing expansion space for the battery cell.

[0014] In some embodiments, the cushioning member comprises foam.

[0015] In some embodiments, a first buffer is provided between adjacent battery cell units, wherein one of the battery cell units is in contact with and connected to one side of the first buffer, and the other battery cell unit is in contact with and connected to the other side of the first buffer.

[0016] In some embodiments, the shell includes a first packaging structure and a second packaging structure arranged opposite to each other along the first direction, the first opening is provided in the first packaging structure, the second opening is provided in the second packaging structure, and the second packaging structure includes a driver, which is used to drive the cooling medium to flow out from the second opening.

[0017] In some embodiments, the battery assembly further includes an end plate and a second buffer member, wherein the end plate is disposed at opposite ends of the battery cell assembly along the first direction; the second buffer member is disposed between the end plate and the first packaging structure, and between the end plate and the second packaging structure.

[0018] In some embodiments, the second packaging structure includes a second end cover and a driver, the second end cover is provided with the second opening, the driver is installed in the second end cover and located at the second opening, and the driver is used to drive the cooling medium to flow out of the second opening.

[0019] In some embodiments, the drive comprises a fan.

[0020] In some embodiments, along the first direction, the thickness of the guide member is 3-5 mm.

[0021] In some embodiments, the adapter plate includes a circuit board, the through hole includes a first through hole provided on the circuit board, and the tab of the first battery cell and the tab of the second battery cell are electrically connected after passing through the first through hole.

[0022] In some embodiments, the adapter plate includes an insulating plate, the through hole includes a second through hole provided on the insulating plate, and the tab of the first battery cell and the tab of the second battery cell are electrically connected after passing through the second through hole.

[0023] In some embodiments, the adapter plate includes a circuit board and an insulating plate, and the tabs of the first battery cell and the tabs of the second battery cell are electrically connected after passing through the second through hole and the first through hole in sequence.

[0024] In some embodiments, the area of ​​the through hole gradually increases.

[0025] An embodiment of the present application further provides an electrical device, which includes the battery assembly described in the above embodiment.

[0026] The battery assembly provided in the embodiment of the present application has a structure in which a flow guide is arranged between every two battery cells, and through holes with gradually increasing areas are arranged on the adapter plate, so that the flow rate of the cooling medium in the flow guides at different positions does not decrease with the flow distance, thereby improving the heat dissipation performance of the battery assembly, reducing the problems of local excessive temperature, uneven temperature rise, and thermal runaway, and improving the safety performance of the battery assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 FIG. 4 is a schematic diagram of the three-dimensional structure of a battery assembly in one embodiment.

[0028] Figure 2 for Figure 1 Schematic diagram of the exploded structure of the battery assembly shown.

[0029] Figure 3 for Figure 2 Exploded view of part of the battery assembly shown.

[0030] Figure 4 for Figure 2The structural diagram and exploded view of the cell unit in the cell assembly of the battery assembly shown.

[0031] Figure 5 for Figure 1 A side view of the battery assembly with the first packaging structure removed is shown.

[0032] Figure 6 for Figure 1 The content in the dotted circle of the top view of the battery assembly after removing the shell and packaging structure is an enlarged view of the local structure.

[0033] Figure 7 for Figure 2 Schematic diagram of the structure of the adapter board in the battery assembly shown.

[0034] Figure 8 for Figure 1 Comparison chart of test results of the battery assembly shown and the battery assembly in the comparative example.

[0035] Figure 9 FIG. 1 is a simplified structural diagram of an electrical device in one embodiment.

[0036] Description of main component symbols:

[0037]

[0038] DETAILED DESCRIPTION

[0039] The technical solutions 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 only part of the embodiments of the present application, rather than all the embodiments.

[0040] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may also be an element centered therein. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may also be an element centered therein. When an element is considered to be "set on" another element, it may be directly set on the other element or there may also be an element centered therein. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0041] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application pertains. The terms used herein in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application. The term "or / and" as used herein includes any and all combinations of one or more of the associated listed items.

[0042] The present application provides a battery assembly, comprising a cell assembly and a shell. The cell assembly comprises a plurality of cell units, which are stacked along a first direction. The shell is disposed around the cell assembly, and along the first direction, the shell has a first opening and a second opening at opposite ends thereof. The cell units comprise a first cell, a second cell, and a flow guide, which is disposed between the first cell and the second cell. The battery assembly further comprises an adapter plate, which is disposed between the shell and the cell assembly. A first channel is formed between the adapter plate and the shell, and the first channel is connected to the first opening. A flow channel is disposed within the flow guide, and a plurality of through holes are disposed on the adapter plate, which connect the first channel with the flow channel; the flow channel is connected to the second opening. Optionally, along the first direction, the area of ​​at least some of the through holes gradually increases. Optionally, along the first direction, the area of ​​the through holes gradually increases.

[0043] The above-mentioned battery assembly is structured by setting a flow guide between every two battery cells and setting through holes with gradually increasing areas on the adapter plate, so that the flow rate of the cooling medium in the flow guides at different positions does not decrease with the flow distance, thereby improving the heat dissipation performance of the battery assembly, reducing the problems of local excessive temperature, uneven temperature rise, and thermal runaway, and improving the safety performance of the battery assembly.

[0044] Some embodiments of the present application are described in detail. In the absence of conflict, the following embodiments and features of the embodiments can be combined with each other.

[0045] See also Figure 1 and Figure 2 In one embodiment, a battery assembly 100 includes a cell assembly 10 and a housing 20. The cell assembly 10 is disposed in the housing 20. The housing 20 includes a first packaging structure 30 and a second packaging structure 40 disposed opposite to each other along a first direction A.

[0046] See also Figure 3 and Figure 4, the battery cell assembly 10 includes a plurality of battery cell units 11, and the plurality of battery cell units 11 are stacked along the first direction A. The battery cell unit 11 includes a first battery cell 111, a second battery cell 112 and a flow guide 113, and the flow guide 113 is arranged between the first battery cell 111 and the second battery cell 112. A flow channel 1131 is provided in the flow guide 113 for the passage of a cooling medium. The first battery cell 111 and the second battery cell 112 are directly in contact and connected with the surfaces on opposite sides of the flow guide 113, so that the cooling medium in the flow channel 1131 can absorb the heat generated by the first battery cell 111 and the second battery cell 112 to achieve the purpose of cooling. In an embodiment of the present application, the flow guide 113 includes a hollow aluminum plate. In other embodiments, the flow guide 113 may also be a hollow structure made of other heat-conducting materials, but the present application is not limited thereto.

[0047] The flow guide 113 is arranged along the second direction B. The second direction B is perpendicular to the first direction A. The first packaging structure 30 is provided with a first opening 32, and the second packaging structure 40 is provided with a second opening 43. The cooling medium enters the housing 20 through the first opening 32 and flows into the flow guides 113 in the multiple battery cells 11. After converging at the end of the flow guide 113 away from the first opening 32, it flows out of the housing 20 through the second opening 43.

[0048] Along the first direction A, the thickness of the guide member 113 is 3-5 mm, so that the cooling medium flowing into the battery cell unit 11 can take away more heat from the first battery cell 111 and the second battery cell 112. Figure 4 The first battery cell 111 and the second battery cell 112 each include a main body 101, a sealing portion 102, and a tab 13. The tab 13 extends from the sealing portion 102 out of the main body 101. In this embodiment, the first battery cell 111 and the second battery cell 112 each include two sealing portions 102 disposed at opposite ends of the main body 101. In other embodiments, the two sealing portions 102 may be disposed at the same end of the main body 101. Along the second direction B, the length of the guide 113 is greater than the length of the main body 101 of the first battery cell 111 and the second battery cell 112 to reduce the risk of the guide 113 scratching the first battery cell 111 and the second battery cell 112.

[0049] The battery cell unit 11 of the present application adopts a "2+1" structure, that is, a structure in which a hollow plate is sandwiched between two battery cells, and no heat sink is arranged between adjacent battery cell units 11. This can increase the volume of the flow channel 1131 while keeping the external dimensions of the battery assembly 100 unchanged, thereby effectively improving the flow rate of the cooling medium between the battery cells, reducing the problems of local excessive temperature and uneven temperature rise in the battery assembly 100, and improving the safety performance of the battery assembly 100.

[0050] In one embodiment, the battery cell assembly 10 further includes a plurality of first buffer members 12, each of which is disposed between any adjacent battery cells 11. Specifically, one battery cell 11 is in contact with one side of the first buffer member 12, while another battery cell 11 is in contact with the other side of the first buffer member 12. The first buffer members 12 are used to absorb the expansion of the battery cell 11 during its use cycle, providing space for expansion. The first buffer members 12 include, but are not limited to, compressible materials such as foam.

[0051] The first packaging structure 30 includes a first end cover 31, and the first end cover 31 is provided with a first opening 32. The second packaging structure 40 includes a second end cover 41 and a driver 42, and the second end cover 41 is provided with a second opening 43. The driver 42 is arranged in the second end cover 41 and is located at the second opening 43. The first opening 32 and the second opening 43 are diagonally distributed. The driver 42 is used to drive the cooling medium in the shell 20 to flow out from the second opening 43, so that a pressure difference is generated in the shell 20, and the cooling medium can continue to flow into the shell 20 from the first opening 32. In an embodiment of the present application, the cooling medium is air, the driver 42 includes a fan, and the battery assembly 100 adopts air cooling to achieve cooling. In other embodiments, the cooling medium can also be a fluid such as a coolant, and the driver 42 is a device such as a drive pump, but the present application is not limited to this.

[0052] Please refer again Figure 2 , the shell 20 includes a first cover plate 21, a second cover plate 22, a first side plate 23 and a second side plate 24. The first cover plate 21 and the second cover plate 22 are arranged relative to each other along a third direction C. The first direction A, the second direction B and the third direction C are perpendicular to each other. The first side plate 23 and the second side plate 24 are arranged relative to each other along the second direction B, and connect the first cover plate 21 and the second cover plate 22. Along the first direction A, the two ends of the first cover plate 21, the second cover plate 22, the first side plate 23 and the second side plate 24 are connected to the first packaging structure 30 and the second packaging structure 40. In this embodiment, the first cover plate 21, the second cover plate 22, the first side plate 23 and the second side plate 24 are a split structure to reduce the transportation cost of materials and facilitate installation. In other embodiments, the first cover plate 21, the second cover plate 22, the first side plate 23 and the second side plate 24 can also be an integrally molded structure, and the present application is not limited to this.

[0053] Along the third direction C, the inner sidewall of the housing 20 is provided with a recess 25. Specifically, the recess 25 is provided on the inner sidewalls of the first cover plate 21 and the second cover plate 22. The sides of the first battery cell 111 and the second battery cell 112 are accommodated in the recess 25 to achieve positioning of the battery cells. Directly positioning the battery cells using the housing 20 simplifies the structure, reduces assembly difficulty, and reduces manufacturing costs.

[0054] Along the second direction B, the outer wall of the housing 20 is provided with a plurality of heat dissipation fins 26. Specifically, the heat dissipation fins 26 are provided on the outer walls of the first side plate 23 and the second side plate 24. The plurality of heat dissipation fins 26 are stacked and spaced apart along the third direction C to increase the heat dissipation area of ​​the housing 20 and improve the heat dissipation performance of the battery assembly 100.

[0055] See also Figure 3 、 Figure 5 、 Figure 6 and Figure 7 In one embodiment, the adapter plate includes a circuit board 50. Along the second direction B, the circuit board 50 is disposed between the housing 20 and the battery cell assembly 10. Specifically, the circuit board 50 is disposed between the battery cell assembly 10 and the first side plate 23. The through-holes include a plurality of first through-holes 51 disposed on the circuit board 50. The tabs 13 of the multiple cells in the battery cell assembly 10 pass through the plurality of first through-holes 51 and are electrically connected according to a predetermined rule, thereby achieving series and parallel connection between the multiple cells. A first channel 27 is formed between the circuit board 50 and the first side plate 23, and the first opening 32 communicates with the first channel 27. The first channel 27 communicates with the plurality of first through-holes 51 on the circuit board 50. Cooling medium flows from the first packaging structure 30 into the first channel 27, then flows through the plurality of first through-holes 51 on the circuit board 50 and is distributed to the plurality of flow guides 113. The flow then converges between the battery cell assembly 10 and the second side plate 24 and flows out through the second opening 43, allowing the cooling medium to remove heat from the battery assembly 100.

[0056] Along the first direction A, the area of ​​the plurality of first through-holes 51 gradually increases. The plurality of flow guides 113 are connected to the plurality of first through-holes 51. The amount of cooling medium passing through the first through-holes 51 per unit time is the flow rate of the first through-holes 51. Along the first direction A, the flow rate of the first through-holes 51 gradually increases. As the transmission distance of the cooling medium along the first direction A gradually increases, the flow resistance of the cooling medium also becomes increasingly greater. The area of ​​the plurality of first through-holes 51 matches the flow resistance of the cooling medium. The area of ​​the first through-holes 51 gradually increases along the transmission direction of the cooling medium. That is, the farther the first through-hole 51 is from the first opening 32, the larger the area. This ensures that the flow rate of cooling medium entering different battery cells 11 does not decrease with increasing flow distance. The amount of cooling medium passing through the flow guide 113 per unit time is substantially the same, which facilitates uniform heat dissipation of the battery and reduces the risk of localized temperature rise and thermal runaway in the battery assembly 100. In the embodiment of the present application, the first through-holes 51 are generally rectangular, with the same length for each of the plurality of first through-holes 51. The width gradually increases from 1 mm to 8 mm along the first direction. In other embodiments, the shape and size of the first through hole 51 may be modified according to actual design requirements, and the present application is not limited thereto.

[0057] In one embodiment, the adapter plate includes an insulating plate 52, and the insulating plate 52 includes an insulating material. The through hole includes a plurality of second through holes 520 provided on the insulating plate 52. Optionally, along the first direction A, the area of ​​at least part of the second through holes 520 gradually increases. Optionally, along the first direction A, the area of ​​the second through holes 520 gradually increases. The tabs of the first battery cell 111 and the tabs of the second battery cell 112 pass through the second through holes 520 in sequence and are electrically connected. The plurality of the flow guides 113 are connected to the plurality of the second through holes 520. The amount of cooling medium passing through the flow guide 113 per unit time is the flow rate of the flow guide 113. Along the first direction A, the flow rate of the second through holes 520 gradually increases. As the transmission distance of the cooling medium along the first direction A gradually increases, the flow resistance of the cooling medium also becomes greater and greater. The areas of the multiple second through holes 520 match the flow resistance of the cooling medium, and the areas of the second through holes 520 gradually increase along the transmission direction of the cooling medium. That is, the farther away from the first opening 32, the larger the area of ​​the second through holes 520. As a result, the flow rate of the cooling medium entering different battery cells 11 does not decrease with the extension of the flow distance, thereby achieving the effect of uniform heat dissipation of multiple battery cells 11 and reducing the problems of local temperature increase and thermal runaway in the battery assembly 100.

[0058] In one embodiment, the adapter plate includes a circuit board 50 and an insulating plate 52. Optionally, the insulating plate 52 is used to support the circuit board 50 and to isolate the circuit board 50 from the battery cell assembly 10 to reduce the risk of short circuits. The tabs of the first battery cell 111 and the second battery cell 112 are electrically connected by sequentially passing through the second through-hole 520 and the first through-hole 51.

[0059] In one embodiment of the present application, there can be two groups of the circuit board 50 and the insulating plate 52, which are respectively arranged between the battery cell assembly 10 and the first side plate 23, and between the battery cell assembly 10 and the second side plate 24, so as to connect the tabs 13 at both ends of the battery cell unit 11 and improve the heat dissipation performance of the battery assembly 100.

[0060] In one embodiment, the circuit board 50 is disposed between the housing 20 and the battery cell assembly 10, forming a first channel 27 between the circuit board 50 and the housing 20, and a second channel 28 between the circuit board 50 and the battery cell assembly 10. The first opening 32 connects the second channel 28 and the first channel 27. The second channel 28 directly connects to the multiple flow channels 1131. The cooling medium can also flow from the first packaging structure 30 into the second channel 28 and then be diverted to the multiple flow channels 1131 of the guide member 113, thereby further increasing the flow rate of the cooling medium in the battery cell unit 11 and improving the heat dissipation performance of the battery assembly 100.

[0061] Please refer again Figure 2 and Figure 3 The battery assembly 100 further includes an end plate 60 and a second buffer member 70. The end plates 60 are disposed at opposite ends of the battery cell assembly 10 along the first direction. Two second buffer members 70 are provided, one of which is disposed between the end plate 60 and the first packaging structure 30, and the other between the end plate 60 and the second packaging structure 40, providing a pressure buffer. The second buffer member 70 comprises, but is not limited to, a compressible material such as foam.

[0062] Figure 8 The figure compares the packaging structure of the battery assembly 100 in the embodiment of the present application and the battery assembly in two comparative examples. In the test, the cooling medium was air and the heat dissipation type was air cooling.

[0063] In the embodiment of this test, the battery cell unit 11 of the battery assembly 100 has a "2+1" structure. In each battery cell unit 11, the flow guide 113 sandwiched between the first battery cell 111 and the second battery cell 112 is made of a hollow aluminum plate with a thickness of 4.6 mm. A plurality of first through holes 51 are provided on the circuit board 50. The area of ​​the first through holes 51 gradually increases along the first direction. The other structures of the battery assembly 100 are as described above and will not be repeated here. In this embodiment, the flow rate of the cooling medium in different flow guides 113 can be matched according to the transmission distance, and the flow rate of the cooling medium in the hollow aluminum plate does not decrease with the increase of the transmission distance.

[0064] In the first comparative example, the battery assembly's cell units have a "1+1" structure, meaning each cell is attached to a 2.3mm-thick hollow aluminum plate. The adapter plate lacks first through-holes of varying sizes. As the transmission distance increases, the amount of cooling medium in the hollow aluminum plate decreases, resulting in higher cell temperatures and greater temperature differences between cells. The remaining structures of the first comparative example are similar to those of this embodiment.

[0065] In the second comparative example, the battery assembly's cell units have a "2+1" structure, meaning a 4.6mm-thick hollow aluminum plate is placed between every two cells. The adapter plate lacks first through-holes of varying areas, making it impossible to match the cooling medium flow rate to the transmission distance. The longer the transmission distance, the less cooling medium remains in the hollow aluminum plate, leading to a greater temperature difference between the cells. The remaining structures of the second comparative example are similar to those of this embodiment.

[0066] The battery assemblies in this embodiment, the first comparative example, and the second comparative example were charged at the same room temperature and starting temperature, with the same charging voltage and time. The cooling fans in the battery assemblies were activated at the same power, and multi-point temperature monitoring was performed on each battery assembly to monitor the temperatures of multiple cells. Over the same test time, the highest cell temperature in each battery assembly was recorded, and the maximum temperature difference between cells was calculated.

[0067] from Figure 8 The test results show that in the first comparative example, the maximum temperature of the battery cell is 43.75°C, and the maximum temperature difference between the battery cells is 2.52°C. In the second comparative example, the maximum temperature of the battery cell is 42.80°C, and the maximum temperature difference between the battery cells is 2.11°C, indicating that the structure of providing a flow guide between every two battery cells has a significant cooling effect. In the embodiment of the present application, the maximum temperature of the battery cell is 42°C, and the maximum temperature difference between the battery cells is 1.56°C, indicating that the technical solution of matching the flow rate of the cooling medium with the flow component by using first through holes of different areas has a significant temperature equalization effect.

[0068] See also Figure 9 , an embodiment of the present application further provides an electric device 200, wherein the electric device 200 includes the battery assembly 100 described in the above embodiment.

[0069] The above embodiments are only used to illustrate the technical solutions of the present application and are not intended to limit the present application. Although the present application has been described in detail with reference to the above preferred embodiments, those skilled in the art should understand that modifications or equivalent replacements of the technical solutions of the present application should not depart from the spirit and scope of the technical solutions of the present application.

Claims

1. A battery assembly comprising: A battery cell assembly, wherein the battery cell assembly comprises a plurality of battery cell units, and the plurality of battery cell units are stacked along a first direction; A shell is disposed around the battery cell assembly, and along the first direction, opposite ends of the shell are respectively provided with a first opening and a second opening; Characterized in that the battery cell unit includes a first battery cell, a second battery cell and a flow guide, and the flow guide is provided between the first battery cell and the second battery cell; The battery assembly further includes an adapter plate, which is disposed between the housing and the battery cell assembly. A first channel is formed between the adapter plate and the housing, and the first channel is connected to the first opening. A flow channel is provided in the flow guide, and a plurality of through holes are provided on the adapter plate, wherein the through holes connect the first channel and the flow channel; the flow channel is connected to the second opening, and the area of ​​at least part of the through holes gradually increases along the first direction; The adapter plate includes a circuit board, the through hole includes a first through hole provided on the circuit board, and the tab of the first battery cell and the tab of the second battery cell are electrically connected after passing through the first through hole.

2. The battery assembly according to claim 1, wherein A second channel is formed between the adapter plate and the battery core assembly, and the second channel is connected to the plurality of flow channels.

3. The battery assembly according to claim 1, wherein: The amount of cooling medium passing through the through hole per unit time is the flow rate of the through hole. Along the first direction, the flow rate of the through hole gradually increases.

4. The battery assembly according to claim 1, wherein Along the third direction, the inner side wall of the shell is provided with a recess, and the sides of the first battery core and the second battery core are accommodated in the recess. The first direction and the third direction are perpendicular to each other.

5. The battery assembly according to claim 1, wherein: The battery cell assembly further includes a plurality of first buffer members, which are arranged between any adjacent battery cell units.

6. The battery assembly according to claim 1, wherein: The housing includes a first packaging structure and a second packaging structure arranged opposite to each other along the first direction, the first opening is provided in the first packaging structure, and the second opening is provided in the second packaging structure; The second packaging structure includes a driver configured to drive a cooling medium to flow out of the second opening.

7. The battery assembly according to claim 1, wherein: Along the first direction, the thickness of the flow guide is 3 mm to 5 mm.

8. The battery assembly according to any one of claims 1 to 7, wherein: The adapter plate includes an insulating plate, the through hole includes a second through hole provided on the insulating plate, and the tab of the first battery cell and the tab of the second battery cell are electrically connected through the second through hole.

9. The battery assembly according to any one of claims 1 to 7, wherein: Along the first direction, the area of ​​the through hole gradually increases.

10. An electrical device, characterized in that: The electrical equipment comprises the battery assembly according to any one of claims 1 to 9.

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