Battery monomer shell, battery monomer and battery

Abstract

The utility model provides a battery monomer shell, a battery monomer and a battery, and relates to the technical field of batteries. The battery monomer shell comprises a shell body, an electrode assembly containing cavity is defined by the shell body, a heat exchange space is formed in at least part of the shell body, and the heat exchange space is filled with a heat exchange medium. The heat exchange space is formed by at least part of the shell body, so that the electrode assembly containing cavity and the heat exchange space can share one plate body, and the adjacent cavity walls between the electrode assembly containing cavity and the heat exchange space are formed on the two opposite plate faces of the plate body respectively; therefore, one of a plate body used for forming part of the cavity wall of the electrode assembly accommodating cavity and a plate body used for forming part of the cavity wall of the heat exchange space between the electrode assembly accommodating cavity and the heat exchange space can be omitted. Therefore, the size and the weight of the battery provided with the heat exchange space can be reduced.

Description

Technical Field

[0001] The present application relates to the technical field of batteries, and particularly relates to a battery cell housing, a battery cell and a battery. Background Art

[0002] A battery cell is one of the important components of a battery. A battery cell generally consists of a housing, an electrode assembly disposed within the housing, and electrode terminals disposed on the housing. During the charging and discharging process of the battery, heat is generated, which affects the battery performance. Therefore, in related technologies, a heat pipe is attached to the outer wall of the battery cell for heat dissipation of the battery cell, so as to prevent local overheating of the battery, thereby improving the overall thermal stability. A heat pipe is a component with a wick structure inside and a cavity filled with a fluid heat exchange medium. The cavity is divided into a heated area and a cold end. The fluid heat exchange medium absorbs heat in the heated area and evaporates into a gaseous heat exchange medium. The gaseous heat exchange medium diffuses to the cold end far from the heated area and condenses into a liquid heat exchange medium at the cold end, thereby achieving the purpose of heat dissipation. After the gaseous heat exchange medium condenses into a liquid, it can flow back to the heated area by the capillary force of the wick structure and evaporate and absorb heat again.

[0003] This heat dissipation method requires bonding the heat pipe to the housing of the battery cell with glue. When the glue application is uneven, air exists between the heat pipe and the housing. Since the thermal conductivity of air is low, the heat exchange effect between the heat pipe and the battery cell is reduced. At the same time, the heat pipe has a certain thickness, which occupies a certain space in the battery. As a result, the volume of the battery is relatively large, and the energy density of the battery is low. Summary of the Utility Model

[0004] Embodiments of the present application provide a battery cell housing, a battery cell and a battery, which can improve the problem of the relatively large volume of the battery.

[0005] In a first aspect, embodiments of the present application provide a battery cell housing, which includes a housing body. The housing body encloses an electrode assembly accommodation cavity, and a heat exchange space is formed on at least part of the housing body. The heat exchange space is filled with a heat exchange medium.

[0006] In an embodiment, the housing body includes a housing and a cover plate. The housing has an electrode assembly accommodation cavity and an opening communicating with the electrode assembly accommodation cavity. The cover plate covers the opening to close the electrode assembly accommodation cavity. Among them, the heat exchange space is formed on at least part of the housing.

[0007] In an embodiment, the housing includes a surrounding plate and an end plate. The surrounding plate is a cylindrical structure. The end plate is disposed at one end of the surrounding plate and closes one end of the surrounding plate. The cover plate is disposed at the other end of the surrounding plate and closes the other end of the surrounding plate. Among them, the heat exchange space is formed on at least part of the surrounding plate.

[0008] In one embodiment, the shroud is a rectangular cylindrical structure. The rectangular cylindrical structure includes a pair of oppositely disposed first side plates and a pair of oppositely disposed second side plates. The area of the second side plates is smaller than that of the first side plates. The heat exchange space is formed on at least one of the first side plates.

[0009] In one embodiment, the housing body includes a housing and a cover plate; the housing has an electrode assembly accommodation cavity and an opening communicating with the electrode assembly accommodation cavity; the cover plate covers the opening to close the electrode assembly accommodation cavity; wherein, the heat exchange space is formed on at least a part of the cover plate.

[0010] In one embodiment, at least a part of the housing body includes a first substrate and a second substrate connected to each other, and the first substrate and the second substrate jointly define the heat exchange space.

[0011] In one embodiment, the second substrate has a first surface facing away from the first substrate, and a plurality of grooves are formed in the second substrate from the first surface.

[0012] In one embodiment, the second substrate further has a second surface facing the first substrate, and a plurality of first protrusions protrude from the second surface toward the first substrate. The first protrusions are located in the heat exchange space, and the plurality of grooves correspond to the plurality of first protrusions one by one. The grooves extend into the corresponding first protrusions. Among them, the first protrusions are in contact with the first substrate, or the first protrusions are spaced apart from the first substrate.

[0013] In one embodiment, the first protrusions are spaced apart from the first substrate, and the distance between the first protrusions and the first substrate is s, satisfying: 0 < s ≤ 0.1 mm.

[0014] In one embodiment, the first substrate is closer to the electrode assembly accommodation cavity than the second substrate.

[0015] In one embodiment, the depth of the grooves is d, satisfying: 0.5 mm ≤ d ≤ 1 mm.

[0016] In one embodiment, the cross-section of the grooves is circular, and the diameter of the end of the grooves facing away from the first substrate is φ, satisfying: 0.5 mm ≤ φ ≤ 1 mm.

[0017] In one embodiment, the second substrate further has a second surface facing the first substrate, and a plurality of second protrusions protrude from the second surface toward the first substrate. The second protrusions are located in the heat exchange space;

[0018] Among them, the second protrusions are in contact with the first substrate, or the second protrusions are spaced apart from the first substrate.

[0019] In one embodiment, the second protrusions are spaced apart from the first substrate, and the distance between the second protrusions and the first substrate is s, satisfying: 0 < s ≤ 0.1 mm.

[0020] In one embodiment, a groove is provided on one side of the second substrate facing the first substrate, and the first substrate closes the opening of the groove to form a heat exchange space.

[0021] In one embodiment, at least part of the housing body is a heat pipe, and the inner cavity of the heat pipe is the heat exchange space.

[0022] In a second aspect, an embodiment of the present application provides a battery cell, which includes an electrode assembly, an electrode terminal, and the aforementioned battery cell housing; the electrode assembly is disposed in the electrode assembly accommodation cavity; the electrode terminal is disposed on the battery cell housing and is connected to the electrode assembly.

[0023] In a third aspect, an embodiment of the present application provides a battery, which includes the aforementioned battery cells, and there are multiple battery cells connected in series or in parallel.

[0024] Advantages of the embodiments of the present application:

[0025] In the embodiments of the present application, by forming the heat exchange space with at least part of the housing body, the electrode assembly accommodation cavity and the heat exchange space can share a plate body, so that the adjacent cavity walls therebetween are respectively formed on two opposite back plate surfaces of the plate body, and thus one of the plate bodies for forming part of the cavity wall of the electrode assembly accommodation cavity and the plate body for forming part of the cavity wall of the heat exchange space between the electrode assembly accommodation cavity and the heat exchange space can be omitted. In this way, the volume and weight of the battery provided with the heat exchange space can be reduced. Description of the Drawings

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present application. For those skilled in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0027] Figure 1 It is a schematic structural diagram of the battery cell housing provided by the embodiment of the present application;

[0028] Figure 2 It is a side view of the battery cell housing provided by the embodiment of the present application;

[0029] Figure 3 It is along Figure 2 The cross-sectional view taken along A-A in

[0030] Figure 4 It is a schematic structural diagram of the surrounding plate provided by the embodiment of the present application;

[0031] Figure 5It is a side view of the plate surface for forming a heat exchange space on the battery cell housing provided by an embodiment of the present application;

[0032] Figure 6 is Figure 5 a cross-sectional view taken along B-B in

[0033] Figure 7 is Figure 6 an enlarged view at C in

[0034] Figure 8 is Figure 7 an enlarged view at D in

[0035] Figure 9 It is a schematic structural diagram of a second substrate provided by an embodiment of the present application;

[0036] Figure 10 It is a schematic structural diagram of a battery cell provided by an embodiment of the present application;

[0037] Figure 11 It is a schematic structural diagram of a battery provided by an embodiment of the present application.

[0038] Explanation of reference numerals:

[0039] 001 - Battery cell housing;

[0040] 002 - Housing body; 021 - Electrode assembly accommodation cavity; 022 - Housing; 221 - Opening; 222 - Enclosure; 2221 - First side plate; 2222 - Second side plate; 223 - End plate; 023 - Cover plate;

[0041] 003 - Heat spreader; 031 - First substrate; 032 - Second substrate; 321 - Groove; 322 - First protrusion; 323 - Second protrusion; 324 - Tank body; 325 - First surface; 326 - Second surface; 033 - Heat exchange space;

[0042] 004 - Battery cell; 041 - Electrode terminal;

[0043] 005 - Battery; 051 - Battery box. Detailed implementation manners

[0044] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope of protection of the present application.

[0045] 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 quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of this application, "a plurality" means two or more, unless otherwise specifically defined.

[0046] In the description of this application, it should be noted that unless otherwise clearly specified and defined, the terms "mounted", "connected", and "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection, an electrical connection, or a connection that allows mutual communication; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0047] To facilitate the understanding of the solution of this application, the spline curves and arrows used for the reference numerals in the drawings are described herein: For the components indicated by the spline curves without arrows, they are solid components, that is, components with a solid structure; for the components indicated by the spline curves with arrows, they are virtual components, that is, components without a solid structure.

[0048] Please refer to Figures 1 to 3 , Figure 1 which is a schematic structural view of the battery cell housing 001 provided by the embodiment of this application, Figure 2 which is a side view of the battery cell housing 001 provided by the embodiment of this application, Figure 3 which is a cross-sectional view taken along A-A in Figure 2 . The embodiment of this application provides a battery cell housing 001, and the battery cell housing 001 includes a housing body 002. The housing body 002 encloses an electrode assembly accommodation cavity 021, and a heat exchange space 033 is formed on at least part of the housing body 002, and a heat exchange medium is filled in the heat exchange space 033.

[0049] It can be understood that the heat exchange medium includes but is not limited to: pure water, ethanol, distilled water, heat-conducting liquid, coolant, phase change medium.

[0050] Among them, the plate surface of the housing body 002 with the heat exchange space 033 is a liquid cooling plate, a heat pipe, or a phase change material plate. When it is a heat pipe, a liquid absorption core is further provided in the heat exchange space 033; when it is a liquid cooling plate, one end of the heat exchange space 033 is the liquid inlet end, and the other end is the liquid outlet end, and the heat exchange space 033 can be an S-shaped channel structure; when it is a phase change material plate, the heat exchange medium is a phase change material, for example, lithium nitrate trihydrate, calcium chloride crystal hydrate, sodium sulfate crystal hydrate, paraffin.

[0051] In addition, when a heat exchange space 033 is formed in a part of the outer shell body 002, the part of the outer shell body 002 other than the heat exchange space 033 is defined with a mounting opening, and the plate surface where the heat exchange space 033 is formed is arranged in the mounting opening, and its periphery is welded or integrally formed with the periphery of the mounting opening. In order to improve the reliability of the welded part, the material of the plate surface where the heat exchange space 033 is formed is the same as that of the remaining parts of the outer shell body 002.

[0052] Among them, the battery cell outer shell 001 can be the outer shell of a cylindrical battery cell or the outer shell of a square battery cell.

[0053] It can be understood that the outer shell body 002 includes a housing 022 and a cover plate 023. The heat exchange space 033 can be formed on at least part of the housing 022, or on at least part of the cover plate 023, or on at least part of the housing 022 and at least part of the cover plate 023.

[0054] In addition, the heat exchange space 033 can be formed by a metal shell with an inner cavity, and the material of the metal shell includes but is not limited to stainless steel, copper, aluminum, copper alloy, and aluminum alloy. The inner cavity of the metal shell is the heat exchange space 033.

[0055] In this embodiment, by forming the heat exchange space 033 in at least part of the outer shell body 002, the electrode assembly accommodation cavity 021 and the heat exchange space 033 can share a plate body, so that the adjacent cavity walls between them are respectively formed on two opposite back plate surfaces of the plate body, and then one of the plate body for forming part of the cavity wall of the electrode assembly accommodation cavity 021 and the plate body for forming part of the cavity wall of the heat exchange space 033 between the electrode assembly accommodation cavity 021 and the heat exchange space 033 can be omitted. In this way, the volume and weight of the battery provided with the heat exchange space 033 can be reduced, and thus the energy density of the battery can be improved.

[0056] In addition, by sharing a plate body between the electrode assembly accommodation cavity 021 and the heat exchange space 033, the heat inside the battery cell can be directly absorbed by the heat exchange space 033. In this way, not only can the heat dissipation path of the battery cell be shortened, the heat dissipation efficiency of the battery cell be improved, but also glue does not need to be configured, so that the auxiliary material cost can be reduced, and many adverse factors caused by uneven gluing can be avoided.

[0057] Please refer to Figure 1, in one embodiment, the housing body 002 includes a housing 022 and a cover plate 023. The housing 022 has an electrode assembly accommodation cavity 021 and an opening 221 communicating with the electrode assembly accommodation cavity 021. The cover plate 023 covers the opening 221 to close the electrode assembly accommodation cavity 021. Among them, a heat exchange space 033 is formed on at least part of the housing 022.

[0058] In this embodiment, by forming the heat exchange space 033 on at least part of the housing 022, compared with forming the heat exchange space 033 on the cover plate 023, the layout of components such as electrode terminals and explosion-proof valves does not need to be considered, thereby controlling the design difficulty of the battery cell housing 001, making the design of the battery cell housing 001 relatively simple, and thus making the manufacturing of the battery cell housing 001 more convenient and easy to produce.

[0059] Specifically, the housing 022 includes a surrounding plate 222 and an end plate 223. The surrounding plate 222 is a cylindrical structure. The end plate 223 is arranged at one end of the surrounding plate 222 and closes one end of the surrounding plate 222. The cover plate 023 is arranged at the other end of the surrounding plate 222 and closes the other end of the surrounding plate 222; among them, the heat exchange space 033 is formed on at least part of the surrounding plate 222.

[0060] It can be understood that the surrounding plate 222 can be a cylindrical structure or a rectangular cylindrical structure. Of course, according to some special occasions, the surrounding plate 222 can also be other cylindrical structures, such as a hexagonal cylindrical structure.

[0061] Among them, both the cover plate 023 and the end plate 223 are welded to the surrounding plate 222 to close the electrode assembly accommodation cavity 021.

[0062] In the related art, a liquid cooling plate is configured at the end plate 223 for heat dissipation, and the surrounding of the surrounding plate 222 is not in direct contact with the liquid cooling plate. Therefore, heat dissipation components need to be configured around the surrounding plate 222 to improve the temperature uniformity of the battery cell.

[0063] Based on this, in this embodiment, through the above settings, the surrounding plate 222 has a heat dissipation function, thereby improving the heat dissipation uniformity of the battery cell, and further reducing the temperature difference inside the battery cell. In this way, the reliability of the battery cell can be improved.

[0064] Please refer to Figure 4 , Figure 4 is a schematic structural diagram of the surrounding plate 222 provided by the embodiment of the present application. In one embodiment, the surrounding plate 222 is a rectangular cylindrical structure. The rectangular cylindrical structure includes a pair of relatively arranged first side plates 2221 and a pair of relatively arranged second side plates 2222. The area of the second side plates 2222 is smaller than the area of the first side plates 2221, and the heat exchange space 033 is formed on at least one of the first side plates 2221.

[0065] It can be understood that two side edges of a second side plate 2222 are respectively connected to one side edge of two first side plates 2221, and two side edges of another second side plate 2222 are respectively connected to the other side edge of two first side plates 2221.

[0066] Among them, the first side plate 2221 and the second side plate 2222 can be welded to form a rectangular tubular structure; or a pair of first side plates 2221 and a pair of second side plates 2222 can be formed by bending a plate body multiple times, and then the two ends of the plate body are welded to form a rectangular tubular structure.

[0067] When the battery cell is a square shell battery cell, it has a large surface and a narrow surface. The large surface is the surface of the first side plate 2221 with a larger area, and the narrow surface is the surface of the second side plate 2222. In the related art, multiple battery cells are stacked in sequence along the direction perpendicular to the large surface. Therefore, it is necessary to arrange a heat dissipation structure on the large surface of the battery cell to improve the problem of poor heat dissipation of the large surface caused by the stacking method of the battery cells.

[0068] Based on this, in this embodiment, at least the first side plate 2221 with a larger area is provided with a heat exchange space 033, which can improve the heat dissipation effect of the part with a larger heat dissipation requirement of the battery cell, thereby improving the heat dissipation uniformity of the battery cell, and further reducing the temperature difference inside the battery cell. In this way, the reliability of the battery cell can be improved.

[0069] In addition to arranging the heat exchange space 033 on the housing 022 in the above embodiment, the heat exchange space 033 can also be configured on the cover plate 023. Specifically, the outer shell body 002 includes a housing 022 and a cover plate 023. The housing 022 has an electrode assembly accommodation cavity 021 and an opening 221 communicating with the electrode assembly accommodation cavity 021. The cover plate 023 covers the opening 221 to close the electrode assembly accommodation cavity 021. Among them, the heat exchange space 033 is formed on at least part of the cover plate 023.

[0070] In this embodiment, through the above settings, one end of the battery cell can be cooled by the liquid-cooled large plate, and the other end can be cooled by the cover plate 023, so that both ends of the battery cell can dissipate heat, and further the heat dissipation efficiency of the battery cell can be improved. Among them, the liquid-cooled large plate refers to a liquid-cooled plate that is thermally coupled to the ends of multiple battery cells at the same time.

[0071] Please refer to Figures 5 to 7 , Figure 5 is a side view of the plate surface of the battery cell housing 001 provided by the embodiment of the present application for forming the heat exchange space 033, Figure 6 is Figure 5 the cross-sectional view taken along B-B in Figure 7 is Figure 6An enlarged view of part C. In one embodiment, at least part of the housing body 002 includes a first substrate 031 and a second substrate 032 that are connected to each other. The first substrate 031 and the second substrate 032 jointly define a heat exchange space 033.

[0072] Specifically, a groove 324 can be provided in one of the first substrate 031 and the second substrate 032, and the other can close the groove 324 to form the heat exchange space 033; it can also be that both the first substrate 031 and the second substrate 032 are provided with grooves 324, and the second substrate 032 is connected to the first substrate 031 so that the two grooves 324 are combined to form the heat exchange space 033.

[0073] Among them, the second substrate 032 can be buckled with the first substrate 031, or the second substrate 032 can be welded to the first substrate 031. It can also be that the second substrate 032 is connected to the first substrate 031 by screws, and a sealing ring is provided at the mating part between them to close the groove 324.

[0074] In addition, the first substrate 031 can be a common plate body between the electrode assembly accommodation cavity 021 and the heat exchange space 033. At this time, the two opposite plate surfaces of the first substrate 031 are respectively formed with the adjacent cavity walls between the electrode assembly accommodation cavity 021 and the heat exchange space 033; it can also be that the second substrate 032 is a common plate body between the electrode assembly accommodation cavity 021 and the heat exchange space 033. At this time, the two opposite plate surfaces of the second substrate 032 are respectively formed with the adjacent cavity walls between the electrode assembly accommodation cavity 021 and the heat exchange space 033.

[0075] It can be understood that when part of the housing body 002 forms a heat exchange space 033, the housing body 002 includes a plate body and a heat exchange plate having a heat exchange space. The plate body defines a cavity and is provided with an installation opening communicating with the cavity. The heat exchange plate is arranged in the installation opening and together with the plate body encloses the electrode assembly accommodation cavity 021.

[0076] Among them, the peripheries of the first substrate 031 and / or the second substrate 032 are welded to the periphery of the installation opening. To improve the reliability of the welding part, the material of the first substrate 031 or the second substrate 032 welded to the installation opening is the same as the material of the rest of the housing body 002.

[0077] In this embodiment, through the above settings, the structure of the formed heat exchange space 033 is simple and easy to manufacture, so that the manufacturing cost of the battery cell housing 001 can be controlled and the manufacturing efficiency can be improved.

[0078] In another embodiment, the first substrate 031 is integrally formed with the housing body 002. A groove is provided on a side of the first substrate 031 facing away from the electrode assembly accommodating cavity 021, and the second substrate 032 closes the groove to form a heat exchange space 033.

[0079] Please refer to Figure 7 , in one embodiment, the second substrate 032 has a first surface 325 facing away from the first substrate 031, and a groove 321 is formed from the first surface 325 into the second substrate 032.

[0080] Optionally, along a direction perpendicular to the first substrate 031, the groove 321 is disposed opposite to the heat exchange space 033.

[0081] It can be understood that the groove 321 can be in a circular, rectangular, oval or other structures. Specifically, the groove 321 is a circular groove 321, and there are multiple grooves 321, and the multiple grooves 321 are distributed in a matrix along the long side and the wide side of the first substrate 031.

[0082] In this embodiment, through the above arrangement, the area of the heat exchange surface of the heat exchange space 033 can be increased, thereby improving the heat dissipation efficiency of the battery cell.

[0083] Please refer to Figure 7 , in one embodiment, the second substrate 032 further has a second surface 326 facing the first substrate 031. A plurality of first protrusions 322 protrude from the second surface 326 towards the first substrate 031. The first protrusions 322 are located in the heat exchange space 033. The plurality of grooves 321 correspond to the plurality of first protrusions 322 one by one. The groove 321 extends into the corresponding first protrusion 322. Among them, the first protrusion 322 abuts against the first substrate 031, or the first protrusion 322 is spaced apart from the first substrate 031.

[0084] It can be understood that in order to control the weight and size of the battery cell housing 001, the thickness of the second substrate 032 is small. Therefore, if the groove 321 directly formed on the second substrate 032 has a small depth, the increase in the area of the heat exchange surface of the heat exchange space 033 caused by the setting of the groove 321 is small.

[0085] Based on this, in this embodiment, by extending the groove 321 into the corresponding first protrusion 322, on the basis of controlling the overall size and weight of the battery cell housing 001, the depth of the groove 321 can be increased, thereby further increasing the area of the heat exchange surface of the heat exchange space 033. In this way, the heat dissipation efficiency of the battery cell can be further improved.

[0086] Among them, the groove 321 can be formed by stamping on the second substrate 032.

[0087] In addition, when being impacted, the rigidity of the part of the battery cell housing with the heat exchange space 033 can be increased based on the abutment of the first protrusion 322 against the first substrate 031, thereby enhancing its impact resistance.

[0088] When the first protrusion 322 and the first substrate 031 are spaced apart, when being impacted, the second substrate 032 can be elastically deformed towards the first substrate 031, or the first substrate 031 can be elastically deformed towards the second substrate 032 until the first protrusion 322 abuts against the first substrate 031. In this way, a part of the impact can be absorbed by the elastic deformation of the first substrate 031 or the second substrate 032, so as to improve the stress state of the components inside the battery cell, thereby enhancing the reliability of the battery cell.

[0089] Moreover, by spacing the first protrusion 322 apart from the first substrate 031, the contact area between the fluid and the first substrate 031 can be increased, thereby improving the heat exchange efficiency. At the same time, the pressure drop when the fluid flows from the heated area to the cold end can also be reduced, so that the fluid can have a faster flow rate, and thus the heat exchange efficiency can be improved.

[0090] Please refer to Figure 8 , Figure 8 which Figure 7 is the enlarged view of the D position in . In one embodiment, the first protrusion 322 and the first substrate 031 are spaced apart, and the distance between the first protrusion 322 and the first substrate 031 is s, satisfying: 0 < s ≤ 0.1 mm.

[0091] Exemplarily, the distance s includes but is not limited to 0.01 mm, 0.21 mm, 0.03 mm, 0.04 mm, 0.05 mm, 0.06 mm, 0.065 mm, 0.07 mm, 0.08 mm, 0.09 mm, 0.1 mm.

[0092] Furthermore, 0.5 mm ≤ s ≤ 1 mm.

[0093] In this embodiment, through the above limitation, on the one hand, a distance can be provided between the first protrusion 322 and the first substrate 031, so that when being impacted, the second substrate 032 can be elastically deformed based on this distance, thereby enabling the second substrate 032 to absorb a part of the impact, and further reducing the impact force received by the components inside the battery cell. In this way, the reliability of the battery cell can be enhanced; on the other hand, it can be avoided that the too large distance results in weak support of the first protrusion 322 for the second substrate 032, and it has appropriate strength to resist impact.

[0094] In one embodiment, the first substrate 031 is closer to the electrode assembly accommodation cavity 021 than the second substrate 032.

[0095] Wherein, one side of the first substrate 031 facing away from the second substrate 032 is the cavity wall of the electrode assembly accommodation cavity 021.

[0096] It can be understood that since the second substrate 032 is provided with structures such as a groove 321, a first protrusion 322, and a second protrusion 323, and the first substrate 031 is a flat structure. Therefore, the flatness control of the first substrate 031 is easier than that of the second substrate 032.

[0097] Based on this, compared with forming the cavity wall of the electrode assembly accommodation cavity 021 on one side of the second substrate 032, in this embodiment, by using the side of the first substrate 031 with higher flatness facing away from the second substrate 032 as the cavity wall of the electrode assembly accommodation cavity 021, when forming the battery cell housing, it can be directly assembled and used without additional flatness adjustment process, thereby reducing the forming difficulty of the battery cell housing 001, and improving the flatness of the cavity wall of the electrode assembly accommodation cavity 021, and further improving the dimensional accuracy of the electrode assembly accommodation cavity 021. Thus, the manufacturing accuracy of the battery cell can be improved.

[0098] Please refer to Figure 8 , in one embodiment, the depth of the groove 321 is d, satisfying: 0.5 mm ≤ d ≤ 1 mm.

[0099] Exemplarily, d includes but is not limited to 0.5 mm, 0.58 mm, 0.6 mm, 0.65 mm, 0.72 mm, 0.75 mm, 0.78 mm, 0.8 mm, 0.95 mm, 1 mm.

[0100] Furthermore, 0.6 mm ≤ d ≤ 1 mm.

[0101] In this embodiment, through the above settings, on the one hand, the groove 321 can have sufficient depth to increase the heat exchange area of the heat exchange space 033; on the other hand, it can avoid the excessive depth of the groove 321 from affecting the arrangement of the first protrusion 322 and the inner cavity, thereby reducing the design difficulty.

[0102] Please refer to Figure 8 , in one embodiment, the cross-section of the groove 321 is circular, and the diameter of the end of the groove 321 facing away from the first substrate 031 is φ, satisfying: 0.5 mm ≤ φ ≤ 1 mm.

[0103] Wherein, the cross-sectional area of the groove 321 refers to the cross-section of the groove 321 parallel to the first substrate 031.

[0104] Exemplarily, φ includes but is not limited to 0.5 mm, 0.58 mm, 0.6 mm, 0.65 mm, 0.72 mm, 0.75 mm, 0.78 mm, 0.8 mm, 0.95 mm, 1 mm.

[0105] Further, 0.6 mm ≤ φ ≤ 0.9 mm.

[0106] In this embodiment, through the above limitations, on the one hand, it can avoid the large forming difficulty caused by the too small diameter of the groove 321, thereby reducing its manufacturing cost; on the other hand, it can reduce the stress concentration caused by the too large diameter of the groove 321, thereby avoiding material fatigue, and further improving the strength of the plate surface of the housing body 002 where the heat exchange space 033 is formed.

[0107] Please refer to Figure 7 , in one embodiment, the second substrate 032 further has a second surface 326 facing the first substrate 031, and a plurality of second protrusions 323 protrude from the second surface 326 towards the first substrate 031. The second protrusions 323 are located in the heat exchange space 033. Among them, the second protrusions 323 are in contact with the first substrate 031, or the second protrusions 323 are arranged at intervals with the first substrate 031.

[0108] It can be understood that the part of the battery cell housing with the heat exchange space 033 has relatively low strength and poor impact resistance.

[0109] Based on this, in this embodiment, by providing the second protrusions 323, when being impacted, based on the contact between the second protrusions 323 and the first substrate 031, the rigidity of the part of the battery cell housing with the heat exchange space 033 can be improved, and further its impact resistance can be enhanced.

[0110] In addition, when the second protrusions 323 are arranged at intervals with the first substrate 031, when being impacted, the second substrate 032 can be elastically deformed towards the first substrate 031, or the first substrate 031 can be elastically deformed towards the second substrate 032 until the second protrusions 323 are in contact with the first substrate 031. In this way, part of the impact can be absorbed through the elastic deformation of the first substrate 031 or the second substrate 032 to improve the stress state of the components inside the battery cell, thereby enhancing the reliability of the battery cell.

[0111] Further, by arranging the second protrusions 323 at intervals with the first substrate 031, the contact area between the fluid and the first substrate 031 can be increased, thereby improving the heat exchange efficiency. At the same time, the pressure drop when the fluid flows from the heated area to the cold end can also be reduced, so that the fluid has a faster flow rate, and further the heat exchange efficiency can be improved.

[0112] Among them, the second protrusions 323 and the first protrusions 322 can be the same structure. In this way, when stamping the groove 321, the second protrusions 323 and the first protrusions 322 can be formed simultaneously. In this way, the forming of the battery cell housing 001 is simple and easy to manufacture.

[0113] When the first protrusion 322 and the second protrusion 323 are two components, the interval between the first protrusion 322 and the first substrate 031 is consistent with the interval between the second protrusion 323 and the first substrate 031.

[0114] In addition, the first protrusion 322 and the second protrusion 323 can also serve as turbulators, which can have a turbulating effect on the heat exchange medium, thereby increasing the heat dissipation effect and heat dissipation uniformity.

[0115] Please refer to Figure 8 , in an embodiment, the second protrusion 323 is arranged at an interval from the first substrate 031, and the distance between the second protrusion 323 and the first substrate 031 is s, satisfying: 0 < s ≤ 0.1 mm.

[0116] Exemplarily, the distance s includes but is not limited to 0.01 mm, 0.21 mm, 0.03 mm, 0.04 mm, 0.05 mm, 0.06 mm, 0.065 mm, 0.07 mm, 0.08 mm, 0.09 mm, 0.1 mm.

[0117] Furthermore, 0.5 mm ≤ s ≤ 1 mm.

[0118] In this embodiment, through the above limitations, on the one hand, a distance can be formed between the second protrusion 323 and the first substrate 031, so that when impacted, the second substrate 032 can elastically deform based on this distance, thereby enabling the second substrate 032 to absorb part of the impact, and further reducing the impact force received by the components inside the battery cell. In this way, the reliability of the battery cell can be improved; on the other hand, it can be avoided that the excessive distance leads to weak support of the second protrusion 323 for the second substrate 032, and it has appropriate strength to resist impact.

[0119] Please refer to Figure 9 , Figure 9 is a schematic structural diagram of the second substrate 032 provided by the embodiment of the present application. In an embodiment, a groove 324 is provided on the side of the second substrate 032 facing the first substrate 031. The first substrate 031 closes the opening 221 of the groove 324 to form a heat exchange space 033.

[0120] In this embodiment, through the above settings, the heat exchange space 033 is formed by the groove 324 on the second substrate 032, so that the first substrate 031 can be a flat structure, thereby reducing the manufacturing difficulty of the first substrate 031. In this way, the manufacturing efficiency of the battery cell can be improved.

[0121] As Figure 1 shown, in an embodiment, at least part of the housing body 002 is a heat pipe 003, and the inner cavity of the heat pipe 003 is the heat exchange space 033.

[0122] In this embodiment, through the above settings, the heat dissipation cost of the battery cell is low and it is easy to maintain.

[0123] Please refer to Figure 10 , Figure 10 which is a schematic structural diagram of the battery cell 004 provided by the embodiment of the present application. Correspondingly, the embodiment of the present application provides a battery cell 004. The battery cell 004 includes an electrode assembly, an electrode terminal 041, and the aforementioned battery cell housing 001. The electrode assembly is disposed in the electrode assembly accommodating cavity 021. The electrode terminal 041 is disposed on the battery cell housing 001 and is connected to the electrode assembly.

[0124] It can be understood that the electrode terminal 041 includes a positive terminal and a negative terminal. The electrode assembly may be formed by laminating a positive electrode sheet, a separator, and a negative electrode sheet in sequence, or may be formed by laminating a positive electrode sheet, a separator, and a negative electrode sheet in sequence and winding them. The battery cell further includes a positive electrode tab, a negative electrode tab, a positive electrode current collector plate, and a negative electrode current collector plate. The positive electrode sheet is connected to the positive electrode current collector plate through the positive electrode tab, and the positive electrode current collector plate is connected to the positive terminal. The negative electrode sheet is connected to the negative electrode current collector plate through the negative electrode tab, and the negative electrode current collector plate is connected to the negative terminal.

[0125] In this embodiment, by adopting the aforementioned battery cell housing 001, the electrode assembly accommodating cavity 021 and the heat exchange space 033 can share a plate body, so that the adjacent cavity walls therebetween are respectively formed on two opposite back plate surfaces of the plate body, and thus one of the plate bodies for forming a part of the cavity wall of the electrode assembly accommodating cavity 021 and the plate body for forming a part of the cavity wall of the heat exchange space 033 originally used can be omitted. In this way, the volume and weight of the battery provided with the heat pipe component can be reduced, and thus the energy density of the battery can be improved.

[0126] Correspondingly, Figure 11 which is a schematic structural diagram of the battery 005 provided by the embodiment of the present application. The embodiment of the present application provides a battery 005, and the battery 005 includes the aforementioned battery cell 004. There are multiple battery cells 004, and the multiple battery cells 004 are connected in series or in parallel.

[0127] It can be understood that the battery 005 further includes a battery box 051 or a bottom plate. The battery cell 004 is disposed in the battery box 051 or mounted on the bottom plate.

[0128] In this embodiment, by adopting the aforementioned battery cell 004, the electrode assembly accommodating cavity 021 and the heat exchange space 033 can share a plate body, so that the adjacent cavity walls therebetween are respectively formed on two opposite back plate surfaces of the plate body. Furthermore, one of the plate body for forming a partial cavity wall of the electrode assembly accommodating cavity 021 and the plate body for forming a partial cavity wall of the heat exchange space 033 between the electrode assembly accommodating cavity 021 and the heat exchange space 033 can be omitted. In this way, the volume and weight of the battery 005 provided with the heat pipe component can be reduced, thereby improving the energy density of the battery 005.

[0129] The embodiments of the present application have been introduced in detail above. Specific examples are used herein to illustrate the principle and implementation manner of the present application. The description of the above embodiments is only used to help understand the method and its core idea of the present application. At the same time, for those skilled in the art, according to the idea of the present application, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present application.

Claims

1. A battery cell housing, characterized in that, It includes a housing body which encloses an electrode assembly accommodation cavity, and a heat exchange space is formed on at least part of the housing body, and a heat exchange medium is filled in the heat exchange space.

2. The battery cell housing according to claim 1, wherein, The housing body includes: A housing having the electrode assembly accommodation cavity and an opening communicating with the electrode assembly accommodation cavity; A cover plate covering the opening to close the electrode assembly accommodation cavity; Wherein, the heat exchange space is formed on at least part of the housing.

3. The battery cell housing according to claim 2, wherein, The housing includes: A surrounding plate which is a cylindrical structure; An end plate provided at one end of the surrounding plate and closing one end of the surrounding plate; The cover plate is provided at the other end of the surrounding plate and closes the other end of the surrounding plate; Wherein, the heat exchange space is formed on at least part of the surrounding plate.

4. The battery cell housing according to claim 3, characterized in that, The surrounding plate is a rectangular cylindrical structure, and the rectangular cylindrical structure includes a pair of relatively arranged first side plates and a pair of relatively arranged second side plates, the area of the second side plates is smaller than that of the first side plates, and the heat exchange space is formed on at least one of the first side plates.

5. The battery cell housing according to claim 1, characterized in that, The housing body includes: A housing having the electrode assembly accommodation cavity and an opening communicating with the electrode assembly accommodation cavity; A cover plate covering the opening to close the electrode assembly accommodation cavity; Wherein, the heat exchange space is formed on at least part of the cover plate.

6. The battery cell housing according to any one of claims 1-5, characterized in that, At least part of the housing body includes a first substrate and a second substrate connected to each other, and the first substrate and the second substrate jointly define the heat exchange space.

7. The battery cell housing according to claim 6, characterized in that, The second substrate has a first surface facing away from the first substrate, and a plurality of grooves are formed from the first surface into the second substrate.

8. The battery cell housing according to claim 7, characterized in that, The second substrate also has a second surface facing the first substrate, and a plurality of first protrusions protrude from the second surface towards the first substrate, the first protrusions are located in the heat exchange space, the plurality of grooves correspond to the plurality of first protrusions one by one, and the grooves extend into the corresponding first protrusions; Wherein, the first protrusions are in contact with the first substrate, or, the first protrusions are spaced apart from the first substrate.

9. The battery cell housing according to claim 8, wherein, The first protrusions are spaced apart from the first substrate, and the spacing between the first protrusions and the first substrate is s, satisfying: 0 < s ≤ 0.1 mm.

10. The battery cell housing according to any one of claims 7-9, characterized in that, The first substrate is closer to the electrode assembly accommodation cavity than the second substrate.

11. The battery cell housing according to any one of claims 7-9, characterized in that, The depth of the groove is d, satisfying: 0.5 mm ≤ d ≤ 1 mm.

12. The battery cell housing according to any one of claims 7-9, characterized in that, The cross-section of the groove is circular, and the diameter of the end of the groove facing away from the first substrate is φ, satisfying: 0.5 mm ≤ φ ≤ 1 mm.

13. The battery cell housing according to claim 6, characterized in that, The second substrate also has a second surface facing the first substrate, and a plurality of second protrusions protrude from the second surface towards the first substrate, the second protrusions are located in the heat exchange space; Wherein, the second protrusions are in contact with the first substrate, or, the second protrusions are spaced apart from the first substrate.

14. The battery cell housing according to claim 13, characterized in that, The second protrusions are spaced apart from the first substrate, and the spacing between the second protrusions and the first substrate is s, satisfying: 0 < s ≤ 0.1 mm.

15. The battery cell housing according to claim 6, wherein, A groove is provided on one side of the second substrate facing the first substrate, and the first substrate closes the opening of the groove to form the heat exchange space.

16. The battery cell housing according to any one of claims 1-5, characterized in that, At least a part of the housing body is a heat pipe, and the inner cavity of the heat pipe is the heat exchange space.

17. A battery cell, characterized in that, Comprising: The battery cell housing according to any one of claims 1-16; An electrode assembly disposed in the electrode assembly accommodating cavity; An electrode terminal disposed on the battery cell housing and connected to the electrode assembly.

18. A battery, characterized in that, Including the battery cell according to claim 17, there are a plurality of the battery cells, and the plurality of battery cells are connected in series or in parallel.

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