Battery cell housing assembly, battery cell, battery pack, and electric device

Abstract

The utility model discloses a kind of shell assembly of battery monomer, battery monomer, battery pack and electrical device, the shell assembly of battery monomer includes: shell body, two side plates of shell body along first direction opposite are first side plate, at least one of two first side plates is equipped with cooling flow channel, cooling flow channel has import and export, import and export are located in the same side of first side plate along second direction, first direction is perpendicular to second direction.According to the shell assembly of battery monomer of the utility model, by being equipped with cooling flow channel in first side plate, under high rate charge-discharge or high temperature environment, the side surface temperature of battery monomer can be reduced, the high temperature performance and high rate performance of battery monomer are promoted, battery monomer capacity attenuation and aging are slowed down, and thermal runaway risk is reduced;Under low temperature environment, the low temperature performance of battery monomer is improved.And the weight, volume and cost of shell body can be relatively reduced, which is beneficial to the lightweight of battery monomer.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a housing assembly for a battery cell, a battery cell, a battery pack, and an electrical device. Background Technology

[0002] In the existing technology, the heat dissipation of square batteries mainly relies on the contact between the bottom of the battery and the liquid cooling plate. The heat dissipation efficiency of the battery sidewall is low, which accelerates the aging of the battery and leads to the risk of thermal runaway. Utility Model Content

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a housing assembly for a battery cell, which can improve the side temperature of the battery cell, enhance the high and low temperature performance and high rate performance of the battery cell, slow down the capacity decay and aging of the battery cell, and reduce the risk of thermal runaway.

[0004] This utility model also proposes a battery cell, which includes the housing assembly of the aforementioned battery cell.

[0005] This utility model also proposes a battery pack, which includes the aforementioned battery cells.

[0006] This utility model also proposes an electrical device, which includes the aforementioned battery pack.

[0007] The housing assembly of a battery cell according to an embodiment of the present invention includes: a housing body, two side plates opposite each other along a first direction are first side plates, at least one of the two first side plates is provided with a cooling channel, the cooling channel has an inlet and an outlet, the inlet and the outlet are located on the same side of the first side plate along a second direction, the first direction being perpendicular to the second direction.

[0008] According to an embodiment of the present invention, the battery cell housing assembly, by providing a cooling channel within the first side plate, allows the coolant within the cooling channel to exchange heat with the first side plate. Under high-rate charging / discharging or high-temperature environments, this reduces the side temperature of the battery cell, significantly improves its lateral heat dissipation capacity, substantially reduces the internal temperature difference within the battery cell, more effectively manages thermal performance, suppresses the formation of high-temperature regions, improves the high-temperature and high-rate performance of the battery cell, slows down capacity decay and aging, and reduces the risk of thermal runaway. In low-temperature environments, the coolant can heat the housing body, improving the low-temperature performance of the battery cell, enabling rapid and uniform temperature rise, and ensuring the power and capacity of the battery cell under low-temperature conditions. Furthermore, it can relatively reduce the weight, volume, and cost of the housing body, contributing to the lightweighting of the battery cell.

[0009] In addition, the housing assembly of the battery cell according to this utility model may also have the following additional technical features: In some embodiments, the cooling channel is provided with a baffle plate that divides the cooling channel into a first channel and a second channel. The first channel is connected to the inlet, and the second channel is connected to the outlet. The first channel is also connected to the second channel.

[0010] In some embodiments, along the second direction, the end of the first flow channel opposite to the inlet and the end of the second flow channel opposite to the outlet are connected.

[0011] In some embodiments, the first flow channel and the second flow channel are arranged along the first direction, and the inlet and the outlet are located at the two ends of the first side plate along a third direction, which is perpendicular to the first direction and the second direction.

[0012] In some embodiments, at least one of the surfaces of the partition facing the first flow channel and the surfaces of the partition facing the second flow channel is provided with protrusions or grooves.

[0013] In some embodiments, the surface of the partition facing the first flow channel is provided with a plurality of protrusions, the protrusions extending along the second direction and the plurality of protrusions arranged along a third direction, the surface of the partition facing the second flow channel is provided with a plurality of grooves, the grooves extending along the second direction, and along the first direction, the plurality of grooves are respectively disposed opposite to the plurality of protrusions, and the third direction is perpendicular to the first direction and the second direction.

[0014] In some embodiments, the inlet aperture is a, and satisfies: a≤0.8mm; and / or, the outlet aperture is b, and satisfies: b≤0.8mm; and / or, the two side plates opposite each other along a third direction of the shell body are second side plates, the two ends of the second side plates along the first direction are respectively connected to the two first side plates, the area of ​​the surface of the second side plate facing the outside of the shell body is greater than the area of ​​the surface of the first side plate facing the outside of the shell body, the thickness of the second side plate is less than the thickness of the first side plate, and the third direction is perpendicular to the first direction and the second direction; and / or, along the first direction, the thickness of the first side plate is c, the size of the cooling channel is d, the distance between the cooling channel and the surface of the first side plate facing the outside of the shell body is e, and the distance between the cooling channel and the surface of the first side plate facing the inside of the shell body is f, and satisfies: 50%≤d / c≤80%, 10%≤e / c≤25%, 10%≤f / c≤25%.

[0015] This utility model also provides a battery cell having the above-described embodiments.

[0016] According to the embodiments of this utility model, the battery cell, through a housing assembly comprising the aforementioned battery cell, and a cooling channel provided within the first side plate, allows the coolant within the cooling channel to exchange heat with the first side plate. Under high-rate charging / discharging or high-temperature environments, this reduces the side temperature of the battery cell, significantly improves its lateral heat dissipation capacity, substantially reduces the internal temperature difference within the battery cell, more effectively manages thermal performance, suppresses the formation of high-temperature regions, improves the high-temperature and high-rate performance of the battery cell, slows down capacity decay and aging, and reduces the risk of thermal runaway. In low-temperature environments, the coolant can heat the housing body, improving the low-temperature performance of the battery cell, enabling rapid and uniform temperature rise, and ensuring the power and capacity of the battery cell under low-temperature conditions. Furthermore, it can relatively reduce the weight, volume, and cost of the housing body, contributing to the lightweighting of the battery cell.

[0017] The battery pack according to an embodiment of the present utility model includes: the above-mentioned battery cell; a liquid cooling plate, the liquid cooling plate being disposed on the side of the battery cell along the second direction where the inlet and the outlet are provided, the liquid cooling plate having a first port and a second port, the first port communicating with the inlet and the second port communicating with the outlet.

[0018] According to the embodiment of the present invention, the battery pack is provided with the above-mentioned battery cells, and a liquid cooling plate is provided on one side of the battery cells along the second direction. The liquid cooling plate has a first port and a second port. The first port is connected to the inlet and the second port is connected to the outlet. It can be linked with the liquid cooling plate in the battery pack to cool or heat the shell body by using the coolant in the liquid cooling plate. Without the need to add additional heat-conducting materials or external heat sinks, the high and low temperature performance and high rate performance of the battery cells can be improved, and the safety of the battery pack can be ensured.

[0019] This utility model also provides an electrical device having the above-described embodiments.

[0020] According to the embodiments of the present invention, the electrical device, by providing the above-mentioned battery pack, can improve the safety of the battery pack while relatively reducing the volume and weight of individual battery cells, which is beneficial to the lightweight design of the electrical device.

[0021] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0022] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1This is a perspective view of the housing assembly of a battery cell according to an embodiment of the present utility model; Figure 2 This is a perspective view of the housing assembly of a battery cell according to an embodiment of the present utility model. Figure 3 yes Figure 2 Enlarged view of point A in the middle; Figure 4 This is a bottom perspective view of the housing assembly of a battery cell according to an embodiment of the present utility model; Figure 5 yes Figure 4 Enlarged view of point B in the middle; Figure 6 yes Figure 5 Enlarged view of point D in the middle; Figure 7 yes Figure 5 Enlarged view of point E in the middle.

[0023] Figure label: 100. Housing assembly; 10. Shell body; 1. First side plate; 11. Cooling channel; 111. First channel; 112. Second channel; 12. Inlet; 13. Outlet; 14. Partition; 141. Protrusion; 142. Groove; 143. Sub-plate; 2. Second side panel. Detailed Implementation

[0024] The embodiments of this utility model are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0025] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0026] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0027] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0028] The housing assembly 100 of a battery cell according to an embodiment of the present invention is described below with reference to the accompanying drawings.

[0029] like Figure 1 As shown, the housing assembly 100 of the battery cell according to an embodiment of the present invention includes a housing body 10.

[0030] Specifically, see the attached document. Figure 2 and attached Figure 4 As shown, the shell body 10 is along the first direction (e.g. Figure 2 (As shown) Two opposing side plates are first side plates 1. At least one of the two first side plates 1 is provided with a cooling channel 11. The cooling channel 11 has an inlet 12 and an outlet 13. The inlet 12 and the outlet 13 are located on the first side plate 1 along a second direction (e.g., Figure 2 On the same side as shown, the first direction is perpendicular to the second direction.

[0031] Understandably, the coolant can flow into the cooling channel 11 through the inlet 12, exchange heat with the first side plate 1, and then flow out of the cooling channel 11 through the outlet 13. By providing the cooling channel 11 in the first side plate 1, the coolant in the cooling channel 11 can exchange heat with the first side plate 1. Under high-rate charging and discharging or high-temperature environments, the coolant flows directly through the core heat-generating area of ​​the battery cell (the first side plate 1 is in close contact with the core / laminated cells), which can reduce the side temperature of the battery cell, significantly improve the lateral heat dissipation capacity of the battery cell, significantly reduce the internal temperature difference of the battery cell, more effectively manage heat, suppress the formation of high-temperature areas, improve the high-temperature performance and high-rate performance of the battery cell, slow down the capacity decay and aging of the battery cell, and reduce the risk of thermal runaway. Under low-temperature environments, the coolant can heat the shell body 10, improve the low-temperature performance of the battery cell, and enable the battery cell to heat up quickly and evenly under low-temperature environments, ensuring the power and capacity of the battery cell under low-temperature environments.

[0032] It is understandable that, since a cooling channel 11 is provided in the first side plate 1, the weight of the shell body 10 can be reduced, which is beneficial to the lightweighting of the battery cell. Moreover, compared with the method of attaching additional heat-conducting materials or adding external heat sinks to the outside of the shell in some existing technologies, the battery cell shell assembly 100 of this utility model does not increase the volume of the shell body 10, and can relatively reduce the volume of the battery cell shell assembly 100, thereby reducing the production cost of the battery cell shell assembly 100.

[0033] Optionally, one of the two first side plates 1 may have a cooling channel 11, or both of the two first side plates 1 may have a cooling channel 11.

[0034] It should be noted that the coolant is at least one of water, alcohol, and fluorinated fluid, which absorbs heat at high temperatures and releases heat at low temperatures, and can heat or cool the first side plate 1 through phase change. For example, the coolant can be water, alcohol, fluorinated fluid, a mixture of water and alcohol, a mixture of water and fluorinated fluid, a mixture of alcohol and fluorinated fluid, or a mixture of water, alcohol, and fluorinated fluid.

[0035] It is understandable that when a battery cell with a housing assembly 100 is applied to a battery pack, the second direction is the vertical direction. Typically, a liquid cooling plate is provided on the lower side of the battery cell. The liquid cooling plate has a first port and a second port. The first port is connected to the inlet 12, and the second port is connected to the outlet 13. The coolant in the liquid cooling plate can flow into the cooling channel 11 through the first port and the inlet 12 in sequence to exchange heat with the housing body 10. Then, it flows back to the liquid cooling plate through the outlet 13 and the second port in sequence. It can be linked with the liquid cooling plate in the battery pack to cool or heat the housing body 10 using the coolant in the liquid cooling plate. Without the need to add additional heat-conducting materials or external heat sinks, the high and low temperature performance and high rate performance of the battery cell can be improved, ensuring the safety of the battery pack.

[0036] It should be noted that the inlet 12 and the outlet 13 are located on the same side of the first side plate 1 along the second direction. On the one hand, this can relatively simplify the production process of the shell body 10 and reduce the production and processing difficulty of the shell body 10. On the other hand, when the battery cell with the shell assembly 100 is applied to the battery pack, it is convenient for the inlet 12 to connect with the first port on the liquid cooling plate and for the outlet 13 to connect with the second port on the liquid cooling plate.

[0037] Preferably, a nozzle is embedded in the inlet 12 and / or outlet 13, which can significantly improve the overall efficiency and reliability of the cooling system formed by the liquid cooling plate and the cooling channel 11 by optimizing fluid dynamics performance, enhancing sealing, simplifying maintenance procedures, and adapting to special working conditions.

[0038] It should be noted that the shell body 10 is a single piece. The cooling channel 11 is processed by chemical etching of the first side plate 1, which can ensure the structural strength of the shell body 10, reduce the risk of sealing failure of the shell body 10, and improve safety.

[0039] According to an embodiment of the present invention, the battery cell housing assembly 100, by providing a cooling channel 11 within the first side plate 1, allows the coolant within the cooling channel 11 to exchange heat with the first side plate 1. Under high-rate charging / discharging or high-temperature environments, this reduces the side temperature of the battery cell, significantly improves its lateral heat dissipation capacity, significantly reduces the internal temperature difference of the battery cell, more effectively manages thermal performance, suppresses the formation of high-temperature regions, improves the high-temperature and high-rate performance of the battery cell, slows down capacity decay and aging, and reduces the risk of thermal runaway. In low-temperature environments, the coolant can heat the housing body 10, improving the low-temperature performance of the battery cell, enabling rapid and uniform temperature rise, and ensuring the power and capacity of the battery cell under low-temperature conditions. Furthermore, it can relatively reduce the weight, volume, and cost of the housing body 10, contributing to the lightweighting of the battery cell.

[0040] In some embodiments of this utility model, reference is made to the appendix. Figure 5 As shown, a baffle 14 is provided inside the cooling channel 11, dividing the cooling channel 11 into a first channel 111 and a second channel 112. The first channel 111 is connected to the inlet 12, and the second channel 112 is connected to the outlet 13, and the first channel 111 and the second channel 112 are also connected. It can be understood that the coolant can flow into the first channel 111 from the inlet 12, exchange heat with the baffle 14 and the portion of the first side plate 1 near the first channel 111, then flow into the second channel 112, exchange heat with the baffle 14 and the portion of the first side plate 1 near the second channel 112, and finally flow out of the cooling channel 11 from the outlet 13.

[0041] Therefore, by providing the partition 14, on the one hand, it can play a supporting role, enhance the structural strength of the first side plate 1, and improve the overall reliability and stability of the shell body 10. On the other hand, it can prevent the coolant from flowing into the cooling channel 11 from one of the inlet 12 and outlet 13 and then directly flowing out from the other. This means that after the coolant enters one of the first channel 111 and the second channel 112, it must pass through at least part of the partition 14 before flowing to the other. This can extend the flow path of the coolant in the cooling channel 11, increase the contact area between the coolant and the first side plate 1, improve the heat exchange effect, further improve the high and low temperature performance and high rate performance of the battery cell, improve the safety performance of the battery cell, and extend the service life of the battery cell.

[0042] In a specific example, the partition 14 extends vertically, and the volume of the cooling channel 11 accounts for 66.7% of the total volume of the first side plate 1. Due to the partition 14, the actual volume of the cooling channel 11 after removing the partition 14 accounts for 40%-50% of the volume of the first side plate 1. This allows the volume of the cooling channel 11 to be increased as much as possible while ensuring the structural strength of the first side plate 1, so that the cooling channel 11 can hold as much coolant as possible.

[0043] In a further embodiment of this utility model, in conjunction with reference to the appendix... Figure 3 and attached Figure 5 As shown, along the second direction, the end of the first flow channel 111 opposite to the inlet 12 and the end of the second flow channel 112 opposite to the outlet 13 are connected. It can be understood that the coolant can flow into the first flow channel 111 from the inlet 12, and then flow along the extension direction of the baffle 14 in the direction opposite to the inlet 12 until it flows to the connection between the first flow channel 111 and the second flow channel 112, flows into the second flow channel 112, and flows along the extension direction of the baffle 14 in the direction close to the outlet 13, and finally flows out of the cooling flow channel 11 from the outlet 13.

[0044] This allows the coolant to enter the cooling channel 11 from the inlet 12, pass over the end of the partition 14 opposite to the inlet 12, and flow out of the cooling channel 11 from the outlet 13. This makes the coolant's path within the cooling channel 11 roughly "U" shaped, requiring it to pass over the partition 14 to flow out. This further extends the flow path of the coolant within the cooling channel 11, increases the contact area between the coolant and the first side plate 1, improves the utilization of the coolant, enhances the heat exchange effect, further improves the high and low temperature performance and high rate performance of the battery cells, improves the safety performance of the battery cells, and extends the service life of the battery cells.

[0045] In a specific example, see Appendix Figure 5 As shown, the second direction is the up-down direction. The inlet 12 and outlet 13 are located on the lower side of the first side plate 1. The baffle 14 is located at the lower end of the cooling channel 11 and extends upward. The uppermost end of the baffle 14 is separated from the uppermost end of the cooling channel 11. The coolant flows into the first channel 111 from the inlet 12, and then flows upward along the extension direction of the baffle 14 until it reaches the connection between the first channel 111 and the second channel 112, flows into the second channel 112, and flows downward along the extension direction of the baffle 14. Finally, it flows out of the cooling channel 11 from the outlet 13.

[0046] In a further embodiment of this utility model, reference is made to the appendix. Figure 5 As shown, the first flow channel 111 and the second flow channel 112 are arranged along the first direction, and the inlet 12 and the outlet 13 are respectively located on the first side plate 1 along the third direction (e.g., Figure 5 As shown, at both ends of the channel 111, the third direction is perpendicular to the first and second directions. It can be understood that the coolant can flow into the first channel 111 from the inlet 12, and then flow in the third direction away from the inlet 12 until it reaches the connection between the first channel 111 and the second channel 112, flows into the second channel 112, and continues to flow in the third direction towards the outlet 13, and finally flows out of the cooling channel 11 from the outlet 13.

[0047] This allows the coolant to flow from one end in the third direction to the other, extending the flow path of the coolant within the cooling channel 11, increasing the coverage area of ​​the coolant in the third direction, expanding the contact area between the coolant and the first side plate 1, improving the utilization of the coolant, enhancing the heat exchange effect, further improving the high and low temperature performance and high rate performance of the battery cells, improving the safety performance of the battery cells, and extending the service life of the battery cells.

[0048] It should be noted that the first flow channel 111 and the second flow channel 112 are arranged in the first direction. The first flow channel 111 may be located on the side of the second flow channel 112 facing the inside of the shell body 10, or the first flow channel 111 may be located on the side of the second flow channel 112 facing the outside of the shell body 10. When the first flow channel 111 is located on the side of the second flow channel 112 facing the inside of the shell body 10, after the coolant enters the first flow channel 111 through the inlet 12, it first exchanges heat with the portion of the partition 14 and the first side plate 1 near the inside of the shell body 10, and then flows to the second flow channel 112 to exchange heat with the portion of the partition 14 and the first side plate 1 near the outside of the shell body 10, and finally flows out of the cooling flow channel 11 through the outlet 13; when the first flow channel 111 is located on the side of the second flow channel 112 facing the outside of the shell body 10, after the coolant enters the first flow channel 111 through the inlet 12, it first exchanges heat with the portion of the partition 14 and the first side plate 1 near the outside of the shell body 10, and then flows to the second flow channel 112 to exchange heat with the portion of the partition 14 and the first side plate 1 near the inside of the shell body 10.

[0049] In a specific example, referring to the appendix Figure 3 and attached Figure 5 As shown, the second direction is the vertical direction. The inlet 12 and outlet 13 are both located on the lower side of the first side plate 1 and are located at both ends of the first side plate 1 along the third direction. The partition 14 is located at the lower end of the cooling channel 11 and extends upward. The uppermost end of the partition 14 is separated from the uppermost end of the cooling channel 11. The coolant flows into the first channel 111 from the inlet 12 located at one end of the first side plate 1 along the third direction, and then flows upward and toward the other end of the third direction until it flows to the connection between the first channel 111 and the second channel 112, flows into the second channel 112, and flows downward and toward the other end of the third direction. Finally, it flows out of the cooling channel 11 from the outlet 13.

[0050] In a further embodiment of this utility model, reference is made to the appendix. Figure 6 and attached Figure 7 As shown, at least one of the surfaces of the separator 14 facing the first flow channel 111 and the surface of the separator 14 facing the second flow channel 112 is provided with a protrusion 141 or a groove 142. By providing the protrusion 141 or the groove 142, on the one hand, the structural strength of the separator 14 itself can be improved, thereby enhancing the structural strength of the first side plate 1 and improving the overall reliability and stability of the shell body 10. On the other hand, it can increase the contact area between the coolant and the separator 14, expand the heat exchange area of ​​the coolant, improve the heat exchange effect, further improve the high and low temperature performance and high rate performance of the battery cell, improve the safety performance of the battery cell, and extend the service life of the battery cell.

[0051] It should be noted that the reference appendix Figure 6 and attached Figure 7As shown, both the groove 142 and the protrusion 141 can increase the contact area between the coolant and the separator 14, expand the heat exchange area of ​​the coolant, improve the heat exchange effect, further enhance the high and low temperature performance and high rate performance of the battery cell, improve the safety performance of the battery cell, and extend the service life of the battery cell.

[0052] Optionally, the protrusion 141 or groove 142 may be provided only on the surface of the partition 14 facing the first flow channel 111, or the protrusion 141 or groove 142 may be provided only on the upper part of the surface of the partition 14 facing the second flow channel 112, or the protrusion 141 or groove 142 may be provided on both the surface of the partition 14 facing the first flow channel 111 and the surface of the partition 14 facing the second flow channel 112.

[0053] Further, see attached document. Figure 6 and attached Figure 7 As shown, when at least one of the surfaces of the partition 14 facing the first flow channel 111 and the partition 14 facing the second flow channel 112 is provided with a protrusion 141, the number of protrusions 141 can be one, five, ten or fifteen; when at least one of the surfaces of the partition 14 facing the first flow channel 111 and the partition 14 facing the second flow channel 112 is provided with a groove 142, the number of grooves 142 can be one, five, ten or fifteen.

[0054] In a further embodiment of this utility model, reference is made to the appendix. Figure 6 and attached Figure 7 As shown, the surface of the partition 14 facing the first flow channel 111 is provided with a plurality of protrusions 141, the protrusions 141 extend along the second direction, the plurality of protrusions 141 are arranged along the third direction, and a recess is formed between two adjacent protrusions 141. The surface of the partition 14 facing the second flow channel 112 is provided with a plurality of grooves 142, the grooves 142 extend along the second direction, the plurality of grooves 142 are arranged along the third direction, and a protrusion is formed between two adjacent grooves 142. Along the first direction, the plurality of grooves 142 are respectively arranged opposite to the plurality of protrusions 141, and the plurality of recesses are respectively arranged opposite to the plurality of protrusions. The third direction is perpendicular to the first direction and the second direction.

[0055] It is understandable that although the surface of the partition 14 facing the first flow channel 111 has multiple protrusions 141 and the surface of the partition 14 facing the second flow channel 112 has multiple grooves 142, by arranging the multiple grooves 142 and the multiple protrusions 141 in a one-to-one correspondence, the thickness of the partition 14 can be made relatively uniform, avoiding local stress concentration, ensuring the structural strength of the partition 14, and improving the structural strength and stability of the first side plate 1. Furthermore, by having multiple protrusions 141 but no grooves 142 on the surface of the partition 14 facing the first flow channel 111, and multiple grooves 142 but no protrusions 141 on the surface of the partition 14 facing the second flow channel 112, the shape of the partition 14 can be relatively regular, resembling a corrugated plate, which facilitates the production and processing of the partition 14.

[0056] In a specific example, see Appendix Figure 7 As shown, the partition 14 includes multiple sub-plates 143 arranged and connected in a third direction. The sub-plates 143 extend along a second direction. In a cross-section perpendicular to the second direction, along the extension direction of a single sub-plate 143, the length of the sub-plate 143 is 1 mm and the width is 0.5 mm, which can ensure the structural strength of the partition 14. Adjacent sub-plates 143 form an angle g between each other, with the included angle g being 90°. Along the third direction, the included angle h between the two end sub-plates 143 and the inner wall surface of the first side plate 1 is 45°, which can reduce the impact of the partition 14 on the two ends of the first side plate 1 along the third direction and reduce the deformation of the first side plate 1. Except for the two end sub-plates 143, the remaining sub-plates 143 are formed in pairs. The surface of a group of sub-plates 143 facing the first flow channel 111 is formed as a protrusion 141, and the surface facing the second flow channel 112 is formed as a groove 142. Optionally, in a cross-section perpendicular to the second direction, the plurality of sub-plates 143 can be formed as follows: Figure 7 As shown in the broken line shape, multiple sub-plates 143 can also be connected by arc-shaped connecting segments to form a wave shape.

[0057] It should be noted that, in the cross section perpendicular to the second direction, the length of a single sub-plate 143 in the extending direction depends on the number of sub-plates 143 divided by the partition 14.

[0058] In some embodiments of this utility model, reference is made to the appendix. Figure 6 As shown, the aperture of inlet 12 is 'a', and satisfies the condition that 'a' ≤ 0.8 mm. This allows it to match the thickness of the first side plate 1, enabling inlet 12 to connect the cooling channel 11 and the outside of the shell body 10 without compromising the seal of the first side plate 1. For example, the aperture 'a' of inlet 12 can be 0.5 mm, 0.6 mm, 0.7 mm, or 0.8 mm.

[0059] In some embodiments of this utility model, reference is made to the appendix. Figure 7As shown, the aperture of outlet 13 is b, and satisfies: b≤0.8mm, which can match the thickness of the first side plate 1, so that outlet 13 can connect the cooling channel 11 and the outside of the shell body 10 without damaging the seal of the first side plate 1. For example, the aperture a of outlet 13 can be 0.5mm, 0.6mm, 0.7mm or 0.8mm.

[0060] In some embodiments of this utility model, reference is made to the appendix. Figure 1 and attached Figure 2 As shown, the two side plates opposite each other along the third direction of the shell body 10 are the second side plates 2. The two ends of the second side plates 2 along the first direction are respectively connected to the two first side plates 1. The area of ​​the surface of the second side plate 2 facing the outside of the shell body 10 is larger than the area of ​​the surface of the first side plate 1 facing the outside of the shell body 10. The thickness of the second side plate 2 is smaller than the thickness of the first side plate 1. The third direction is perpendicular to the first direction and the second direction, which can make the relatively larger second side plate 2 thinner, avoid the shell assembly 100 occupying too much space of the battery cell, and ensure the effective capacity of the battery cell. The relatively smaller first side plate 1 is thicker, which can facilitate the etching of the first side plate 1 to form the cooling channel 11 and reduce the deformation caused by the existence of the cooling channel 11.

[0061] In some embodiments of this utility model, reference is made to the appendix. Figure 6 As shown, along the first direction, the thickness of the first side plate 1 is c, the size of the cooling channel 11 is d, the distance between the cooling channel 11 and the surface of the first side plate 1 facing the outside of the shell body 10 is e, and the distance between the cooling channel 11 and the surface of the first side plate 1 facing the inside of the shell body 10 is f, and satisfying: d+e+f=c, 50%≤d / c≤80%, 10%≤e / c≤25%, 10%≤f / c≤25%.

[0062] It is understandable that by limiting the proportion of the distance e between the cooling channel 11 and the surface of the first side plate 1 facing the outside of the shell body 10 to the thickness c of the first side plate 1, and by limiting the proportion of the distance f between the cooling channel 11 and the surface of the first side plate 1 facing the inside of the shell body 10 to the thickness c of the first side plate 1, the overall structural strength of the first side plate 1 and the sealing performance of the first side plate 1 can be guaranteed. By limiting the proportion of the size d of the cooling channel 11 to the thickness c of the first side plate 1, the volume of the cooling channel 11 can be guaranteed, so that the coolant in the cooling channel 11 can exchange heat with the walls of the first side plate 1 on both sides along the first direction, thereby improving the temperature of the first side plate 1 and thus improving the temperature inside the battery cell, and improving the high and low temperature performance and high rate performance of the battery cell.

[0063] In a specific example, along the first direction, the thickness c of the first side plate 1 is 1.2 mm, the size d of the cooling channel 11 is 0.8 mm, the distance e between the cooling channel 11 and the surface of the first side plate 1 facing the outside of the shell body 10 is 0.2 mm, and the distance f between the cooling channel 11 and the surface of the first side plate 1 facing the inside of the shell body 10 is 0.2 mm.

[0064] This utility model also proposes a battery cell having a housing assembly 100 of the battery cell described in the above embodiments.

[0065] According to the embodiments of this utility model, the battery cell, through the housing assembly 100 provided with the aforementioned battery cell, and the cooling channel 11 provided in the first side plate 1, allows the coolant in the cooling channel 11 to exchange heat with the first side plate 1. Under high-rate charging and discharging or high-temperature environments, this can reduce the side temperature of the battery cell, significantly improve the lateral heat dissipation capacity of the battery cell, significantly reduce the internal temperature difference of the battery cell, more effectively manage heat, suppress the formation of high-temperature areas, improve the high-temperature performance and high-rate performance of the battery cell, slow down the capacity decay and aging of the battery cell, and reduce the risk of thermal runaway. Under low-temperature environments, the coolant can heat the housing body 10, improve the low-temperature performance of the battery cell, and enable the battery cell to heat up quickly and uniformly under low-temperature environments, ensuring the power and capacity of the battery cell under low-temperature environments. Furthermore, it can relatively reduce the weight, volume, and cost of the housing body 10, which is beneficial to the lightweighting of the battery cell.

[0066] This utility model also proposes a battery pack having the battery cells described in the above embodiments.

[0067] The battery pack according to an embodiment of the present invention includes the aforementioned battery cells and liquid cooling plate.

[0068] Specifically, the liquid cooling plate is located on the side of the battery cell along the second direction where there is an inlet 12 and an outlet 13. The liquid cooling plate has a first port and a second port. The first port is connected to the inlet 12 and the second port is connected to the outlet 13. The coolant in the liquid cooling plate can flow into the cooling channel 11 through the first port and the inlet 12 in sequence to exchange heat with the shell body 10. Then, it flows back to the liquid cooling plate through the outlet 13 and the second port in sequence. This allows it to work in conjunction with the liquid cooling plate in the battery pack. The coolant in the liquid cooling plate can be used to cool or heat the shell body 10. Without the need for additional heat-conducting materials or external heat sinks, the high and low temperature performance and high rate performance of the battery cell can be improved, ensuring the safety of the battery pack.

[0069] According to the embodiment of the present invention, the battery pack is provided with the above-mentioned battery cells, and a liquid cooling plate is provided on one side of the battery cells along the second direction. The liquid cooling plate has a first port and a second port. The first port is connected to the inlet 12 and the second port is connected to the outlet 13. It can be linked with the liquid cooling plate in the battery pack to cool or heat the shell body 10 by using the coolant in the liquid cooling plate. Without the need to add additional heat-conducting materials or external heat sinks, the high and low temperature performance and high rate performance of the battery cells can be improved, and the safety of the battery pack can be ensured.

[0070] This utility model also proposes an electrical device having the battery pack described in the above embodiments.

[0071] The electrical device can be a vehicle, and the battery pack can be installed at the bottom of the vehicle body.

[0072] According to the embodiments of the present invention, the electrical device, by providing the above-mentioned battery pack, can improve the safety of the battery pack while relatively reducing the volume and weight of individual battery cells, which is beneficial to the lightweight design of the electrical device.

[0073] The housing assembly 100 of the battery cell, the battery cell, the battery pack, and other components and operations of the electrical device according to the embodiments of the present invention are known to those skilled in the art and will not be described in detail here.

[0074] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0075] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A housing assembly for a single battery cell, characterized in that, include: The shell body (10) has two side plates opposite each other along a first direction, which are called first side plates (1). At least one of the two first side plates (1) is provided with a cooling channel (11). The cooling channel (11) has an inlet (12) and an outlet (13). The inlet (12) and the outlet (13) are located on the same side of the first side plate (1) along a second direction, which is perpendicular to the second direction.

2. The housing assembly of the battery cell according to claim 1, characterized in that, The cooling channel (11) is provided with a baffle (14), which divides the cooling channel (11) into a first channel (111) and a second channel (112). The first channel (111) is connected to the inlet (12), and the second channel (112) is connected to the outlet (13). The first channel (111) is also connected to the second channel (112).

3. The housing assembly of the battery cell according to claim 2, characterized in that, Along the second direction, the end of the first flow channel (111) opposite to the inlet (12) and the end of the second flow channel (112) opposite to the outlet (13) are connected.

4. The housing assembly of the battery cell according to claim 2, characterized in that, The first flow channel (111) and the second flow channel (112) are arranged along the first direction, and the inlet (12) and the outlet (13) are located at the two ends of the first side plate (1) along a third direction, which is perpendicular to the first direction and the second direction.

5. The housing assembly of the battery cell according to claim 2, characterized in that, At least one of the surfaces of the partition (14) facing the first flow channel (111) and the surfaces of the partition (14) facing the second flow channel (112) is provided with a protrusion (141) or a groove (142).

6. The housing assembly of the battery cell according to claim 5, characterized in that, The partition plate (14) has a plurality of protrusions (141) on its surface facing the first flow channel (111). The protrusions (141) extend along the second direction and are arranged along the third direction. The partition plate (14) has a plurality of grooves (142) on its surface facing the second flow channel (112). The grooves (142) extend along the second direction. Along the first direction, the plurality of grooves (142) are respectively arranged opposite to the plurality of protrusions (141). The third direction is perpendicular to the first direction and the second direction.

7. The housing assembly of the battery cell according to any one of claims 1-6, characterized in that, The aperture of the inlet (12) is a, and satisfies: a≤0.8mm; And / or, the aperture of the outlet (13) is b, and satisfies: b≤0.8mm; And / or, the shell body (10) has two opposite side plates along a third direction as second side plates (2), the two ends of the second side plates (2) along the first direction are respectively connected to the two first side plates (1), the area of ​​the surface of the second side plate (2) facing the outside of the shell body (10) is greater than the area of ​​the surface of the first side plate (1) facing the outside of the shell body (10), the thickness of the second side plate (2) is less than the thickness of the first side plate (1), and the third direction is perpendicular to the first direction and the second direction; And / or, along the first direction, the thickness of the first side plate (1) is c, the size of the cooling channel (11) is d, the distance between the cooling channel (11) and the surface of the first side plate (1) facing the outside of the shell body (10) is e, and the distance between the cooling channel (11) and the surface of the first side plate (1) facing the inside of the shell body (10) is f, and satisfying: 50%≤d / c≤80%, 10%≤e / c≤25%, 10%≤f / c≤25%.

8. A single battery cell, characterized in that, Includes a housing assembly (100) of a battery cell according to any one of claims 1-7.

9. A battery pack, characterized in that, include: The battery cell according to claim 8; A liquid cooling plate is disposed on the side of the battery cell along the second direction where the inlet (12) and the outlet (13) are provided. The liquid cooling plate has a first port and a second port, the first port being connected to the inlet (12) and the second port being connected to the outlet (13).

10. An electrical device, characterized in that, Includes the battery pack according to claim 9.

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