Battery cell and battery

Abstract

The invention provides a battery cell and a battery, and relates to the technical field of battery cells. The battery cell provided by the invention is used for the battery. The battery cell comprises a shell assembly and a roll core, wherein the shell assembly comprises a shell body, a cover plate and a bottom plate; a first opening and a second opening are formed in the two opposite ends of the shell body respectively, the cover plate covers the first opening, the bottom plate covers the second opening, the shell body, the cover plate and the bottom plate are matched to form a mounting cavity, and the mounting cavity is used for mounting a roll core. Wherein the shell body comprises an evaporation area and a condensation area which are communicated with each other, the evaporation area is closer to the roll core than the condensation area, and working media are arranged in the evaporation area and the condensation area. According to the battery cell provided by the invention, the cooling efficiency of the battery cell can be improved, so that the use safety of the battery cell and the battery is ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery cells, and particularly relates to a battery cell and a battery. BACKGROUND

[0002] A battery cell is a device capable of converting chemical energy into electrical energy, which can provide electrical energy for many electrical appliances, so that the electrical appliances are in a working state. The existing battery cell is widely used in the power field of automobiles, engineering machinery equipment and ships, and can also be used for household energy storage, industrial and commercial energy storage and communication base stations.

[0003] Based on the structure of the existing battery cell, the battery cell includes a shell, a battery cell and a liquid cooling plate, the battery cell is installed in the shell, and the liquid cooling plate is arranged on the outer side of the shell. In the use of the battery cell, the heat generated by the battery cell is generally transmitted to the liquid cooling plate through the shell, and then the heat generated by the battery cell is cooled by the liquid cooling plate to cool the battery cell and ensure the safety of the battery cell.

[0004] However, based on the structure of the existing battery cell, the time for the heat generated by the battery cell to reach the liquid cooling plate is long, which leads to low cooling efficiency of the battery cell. SUMMARY

[0005] The present application provides a battery cell and a battery, which can improve the cooling efficiency of the battery cell and ensure the safety of the battery cell and the battery.

[0006] In a first aspect, the present application provides a battery cell for a battery. The battery cell includes a shell assembly and a winding core. The shell assembly includes a shell body, a cover plate and a bottom plate. The two ends of the shell body arranged oppositely are respectively provided with a first opening and a second opening, the cover plate is arranged on the first opening, and the bottom plate is arranged on the second opening. The shell body, the cover plate and the bottom plate cooperate to form a mounting cavity for mounting the winding core. The shell body includes a communication evaporation zone and a condensation zone, the evaporation zone is arranged close to the winding core compared with the condensation zone, and working medium is arranged in the evaporation zone and the condensation zone.

[0007] In the example of the present application, the shell assembly includes a shell body, a cover plate and a bottom plate. The cover plate and the bottom plate cooperate to block the first opening and the second opening arranged oppositely on the shell body, so as to ensure the connection reliability of the winding core and the shell assembly. Since the shell body includes a communication evaporation zone and a condensation zone, and working medium is arranged in the evaporation zone and the condensation zone. In the use process of the battery cell, since the evaporation zone is arranged close to the winding core, the working medium can absorb heat energy in the evaporation zone to convert from liquid state to gaseous state, so as to cool the winding core. Since there is a temperature difference between the evaporation zone close to the winding core and the condensation zone away from the winding core, the working medium evaporated in the evaporation zone is converted from liquid state to liquid state when it reaches the condensation zone, so as to enter the evaporation zone again to cool the winding core.

[0008] Compared with the prior art, the heat generated by the core is transmitted to the shell assembly, and then transmitted to the liquid cooling plate in the battery structure through the heat-conducting structural adhesive or other structures. In the example of the present application, the cooling of the core can be realized by the phase change of the working medium in the evaporation zone and the condensation zone, so that the heat transfer path of the core is shorter, and the cooling efficiency of the core and the battery cell is higher, the possibility of thermal runaway of the battery cell is reduced, and the safety of the battery cell is ensured. And because in the example of the present application, the evaporation zone and the condensation zone are arranged on the shell body and are integrally formed with the shell body, the cooling structure can be avoided to be arranged separately, and the structure of the battery cell is simple and the manufacturing cost is low, and the energy density of the battery can be improved.

[0009] In some possible implementations, the shell body further includes a first communication zone and a second communication zone. The first communication zone is arranged on one side of the evaporation zone and the condensation zone close to the bottom plate, and the first communication zone communicates the evaporation zone and the condensation zone. The second communication zone is arranged on one side of the evaporation zone and the condensation zone close to the cover plate, and the second communication zone communicates the evaporation zone and the condensation zone.

[0010] In the example of the present application, the second communication zone is arranged on one side of the evaporation zone and the condensation zone close to the cover plate, so that the evaporation zone and the condensation zone are communicated at the position close to the cover plate, and then the working medium converted into gaseous state in the evaporation zone due to the heat emitted by the core can enter the condensation zone through the second communication zone. The first communication zone is arranged on one side of the evaporation zone and the condensation zone close to the bottom plate, so that the evaporation zone and the condensation zone are communicated at the position close to the bottom plate, and then the working medium liquefied in the condensation zone can re-enter the evaporation zone through the first communication zone, complete the circulation of the working medium in the condensation zone and the evaporation zone, and improve the utilization rate of the working medium.

[0011] In some possible implementations, the evaporation zone includes a plurality of evaporation channels arranged at intervals, one end of the evaporation channel communicates with the first communication zone, and the other end of the evaporation channel communicates with the second communication zone. The condensation zone includes at least one condensation channel, one end of the condensation channel communicates with the first communication zone, and the other end of the condensation channel communicates with the second communication zone, and the cross-sectional area of the condensation channel is greater than that of the evaporation channel.

[0012] In the example of the present application, by arranging the cross-sectional area of the condensation channel to be greater than that of the evaporation channel, the capillary pressure in the condensation channel is greater, and the greater capillary pressure can make the working medium steam heated to overcome the gravity and flow resistance, wet the inner surfaces of the evaporation channel and the condensation channel, improve the efficiency of the working medium steam liquefaction, speed up the efficiency of the working medium to complete the phase change conversion, and then improve the cooling efficiency of the working medium to the core through the shell body.

[0013] In addition, in the examples of the present application, the evaporation zone includes a plurality of spaced evaporation channels, and the condensation zone includes a plurality of spaced condensation channels. Therefore, during the use of the battery cell, if the battery cell deforms in the later stage of use, the deformation of the evaporation channels and the condensation channels arranged on the shell body can reduce the deformation of the entire battery cell.

[0014] In some possible implementation manners, the inner wall of the evaporation channel is provided with a first hydrophilic film, and / or the inner wall of the condensation channel is provided with a second hydrophilic film.

[0015] In the examples of the present application, by arranging the first hydrophilic film on the inner wall of the evaporation channel, the efficiency of liquefaction of the working medium vapor can be increased, the efficiency of phase change conversion of the working medium can be accelerated, and the efficiency of cooling of the battery cell by the working medium through the shell body can be improved. By arranging the second hydrophilic film on the inner wall of the condensation channel, the efficiency of liquefaction of the working medium vapor can be increased, the efficiency of phase change conversion of the working medium can be accelerated, and the efficiency of cooling of the battery cell by the working medium through the shell body can be improved.

[0016] In some possible implementation manners, the shell body includes oppositely arranged first and second side walls, and oppositely arranged third and fourth side walls. The third side wall connects one side of the first side wall and one side of the second side wall, and the fourth side wall connects the other side of the first side wall and the other side of the second side wall. At least one of the first side wall, the second side wall, the third side wall, and the fourth side wall is provided with an evaporation zone and a condensation zone.

[0017] In the examples of the present application, the first side wall and the second side wall are oppositely arranged, the third side wall and the fourth side wall are oppositely arranged, and the third side wall and the fourth side wall cooperatively connect the first side wall and the second side wall from different positions to reliably connect the first side wall, the second side wall, the third side wall, and the fourth side wall. By arranging the evaporation zone and the condensation zone on at least one of the first side wall, the second side wall, the third side wall, and the fourth side wall, the battery cell can be in contact with the evaporation zone, and the battery cell can be cooled by the circulating phase change of the working medium in the evaporation zone and the condensation zone.

[0018] The more side walls provided with the evaporation zone and the condensation zone, the larger the contact area between the battery cell and the evaporation zone, and the more the phase change of the working medium in the evaporation zone in contact with the battery cell, thereby improving the efficiency of cooling of the battery cell by the working medium through the shell body.

[0019] In the case where all the side walls of the shell body are provided with the evaporation zone and the condensation zone, during the use of the battery cell, the heat generated by the battery cell can be transferred to the entire shell assembly through the phase change of the working medium in the evaporation zone, thereby reducing the temperature difference at different positions of the shell body to ensure the use performance of the battery cell and prolong the service life of the battery cell.

[0020] In addition, in the examples of the present application, the evaporation area and the condensation area are arranged on all the side walls of the shell body, so that on the basis of the small temperature difference between different parts of the shell assembly, the liquid cooling plate arranged in the battery can further accelerate the cooling efficiency of the battery cell and reduce the possibility of thermal runaway of the battery cell.

[0021] In some possible implementation manners, the first reinforcing structure is arranged at the connection between the first side wall and the third side wall, and the second reinforcing structure is arranged at the connection between the first side wall and the fourth side wall.

[0022] In the examples of the present application, the first reinforcing structure arranged at the connection between the first side wall and the third side wall can ensure the connection reliability of the first side wall and the third side wall, improve the strength of the connection between the first side wall and the third side wall, reduce the possibility of damage to the connection between the first side wall and the third side wall during use, and further ensure the use reliability of the shell body. The second reinforcing structure arranged at the connection between the first side wall and the fourth side wall can ensure the connection reliability of the first side wall and the fourth side wall, improve the strength of the connection between the first side wall and the fourth side wall, reduce the possibility of damage to the connection between the first side wall and the fourth side wall during use, and further ensure the use reliability of the shell body.

[0023] In some possible implementation manners, the shell body includes an inner plate, an outer plate and a spacing plate arranged at intervals, the spacing plate is arranged between the inner plate and the outer plate, the inner plate is arranged closer to the winding core than the outer plate, and the inner plate and the spacing plate cooperate to form the evaporation area, and the outer plate and the spacing plate cooperate to form the condensation area. A plurality of third reinforcing structures are arranged in the condensation area, a first side of the third reinforcing structure is connected to the spacing plate, a second side of the third reinforcing structure is connected to the outer plate, or the second side of the third reinforcing structure can abut against the outer plate.

[0024] In the examples of the present application, the shell body includes an outer plate, a spacing plate and an inner plate arranged at intervals, one side of the spacing plate facing the inner plate cooperates with the inner plate to form the evaporation area, and since the inner plate is arranged closer to the winding core than the outer plate, the winding core can be in contact with the evaporation area through the inner plate, so that the working medium in the evaporation area can change phase to cool the winding core. One side of the spacing plate facing the outer plate cooperates with the outer plate to form the condensation area, so that the working medium vapor can be liquefied in the condensation area, facilitating the working medium to cool the winding core again. In addition, the third reinforcing structure is arranged between the outer plate and the spacing plate, which can provide support for the outer plate, and can reduce the deformation amplitude of the outer plate caused by external force during use of the shell body, thereby ensuring the use reliability of the shell body and the battery cell.

[0025] In some possible implementation manners, the shell assembly further includes a first sealing structure, a second sealing structure, a third sealing structure, and a fourth sealing structure. The first sealing structure is arranged on one side of the inner plate close to the winding core, one side of the first sealing structure is connected to the cover plate, and the other side of the first sealing structure is connected to the inner plate. The second sealing structure is arranged on one side of the outer plate away from the winding core, one side of the second sealing structure is connected to the cover plate, and the other side of the second sealing structure is connected to the outer plate. The third sealing structure is arranged on one side of the inner plate close to the winding core, one side of the third sealing structure is connected to the bottom plate, and the other side of the third sealing structure is connected to the inner plate. The fourth sealing structure is arranged on one side of the outer plate away from the winding core, one side of the fourth sealing structure is connected to the bottom plate, and the other side of the fourth sealing structure is connected to the outer plate.

[0026] In the examples of the present application, by arranging the first sealing structure at the connection between the cover plate and the inner plate, the possibility of the working medium entering the installation cavity from the connection between the cover plate and the inner plate can be reduced, thereby ensuring the use performance of the winding core. By arranging the second sealing structure at the connection between the cover plate and the outer plate, the possibility of the working medium leaking out of the shell body from the connection between the cover plate and the outer plate can be reduced, and the possibility of impurities such as external air and water entering the shell body from the connection between the cover plate and the outer plate can be reduced, thereby ensuring the use performance of the working medium. The third sealing structure and the first sealing structure have similar effects, and the fourth sealing structure and the second sealing structure have similar effects, which will not be described herein again.

[0027] In some possible implementation manners, the working medium includes one of water, acetone, methanol, and a hydrofluorocarbon chemical refrigerant.

[0028] Based on the characteristics of the above different working media, the surface tension coefficient of water is relatively high, and the latent heat of vaporization is relatively large, so that the cooling efficiency of the shell body on the winding core can be improved. Since the boiling point and freezing point of acetone are relatively low, acetone can be used to cool the winding core in a low-temperature environment. Since the freezing point of methanol is relatively low and the boiling point of methanol is relatively high, when the working medium is methanol, the applicable temperature range is relatively large. The hydrofluorocarbon chemical refrigerant has a smooth saturation vapor pressure curve, so that the stability of the hydrofluorocarbon chemical refrigerant is relatively high. Therefore, according to the use requirements of users, the corresponding working medium can be selected to meet different requirements of users and improve user experience.

[0029] In a second aspect, the present application provides a battery. The battery includes a mounting box and an electric core. The electric core is fixedly installed to the mounting box, and the mounting box is provided with a liquid cooling plate on one side close to the top of the electric core, or the mounting box is provided with a liquid cooling plate on one side close to the bottom of the electric core.

[0030] The electric core provided in the above second aspect and each possible design of the above second aspect has the beneficial effects of the electric core provided in the above first aspect and each possible implementation manner of the above first aspect, which will not be described herein again. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 This is a schematic diagram of the structure of a battery provided as an example in this application.

[0032] Figure 2 A schematic diagram of a battery cell from a first-view perspective is provided as an example of this application.

[0033] Figure 3 This is a schematic diagram of a partial explosion structure of a battery cell, provided as an example of this application.

[0034] Figure 4 This is a schematic diagram of a battery cell from a second-view perspective, which serves as an example of this application.

[0035] Figure 5 for Figure 4 Sectional view at point AA.

[0036] Figure 6 for Figure 5 A magnified view of a portion of point A in the middle.

[0037] Figure 7 This is a schematic diagram of a battery cell from a third-person perspective, which serves as an example of this application.

[0038] Figure 8 for Figure 7 Sectional view at point BB.

[0039] Figure 9 for Figure 8 A magnified view of a portion of point B in the middle.

[0040] Figure 10 for Figure 8 A magnified view of a portion of point C.

[0041] Explanation of reference numerals in the attached figures: 100. Battery; 110. Mounting housing; 120. Liquid cooling plate; 200. Battery cell; 210. Housing assembly; 211. Cover plate; 2111. Filling hole; 212. Housing body; 2121. Evaporation zone; 2122. Condensation zone; 2123. First connecting zone; 2124. Second connecting zone; 213. Inner plate; 214. Spacer plate; 215. Outer plate; 216. Third reinforcing structure; 217. Bottom plate; 220. Core. Detailed Implementation

[0042] In order to make the purposes, technical solutions and advantages of the examples of the present application clearer, the technical solutions in the examples of the present application will be described clearly and completely below with reference to the drawings in the examples of the present application. Obviously, the described examples are some but not all of the examples of the present application. Based on the examples in the present application, all other examples obtained by a person of ordinary skill in the art without creative effort should fall within the scope of the present application.

[0043] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs; the terminology used in the specification herein is for the purpose of describing particular examples only and is not intended to be limiting of the present application; the terms "comprising," "comprises" and "including" as well as variations thereof herein are intended to cover a non-exclusive inclusion.

[0044] Reference herein to "an example" means that a particular feature, structure, or characteristic described in connection with the example can be included in at least one example of the present application. The appearances of the phrase "in an example" in various places in the specification are not necessarily all referring to the same example, nor are they necessarily mutually exclusive or alternative examples to one another. A person of ordinary skill in the art will readily recognize from the description herein certain examples as being composable with others.

[0045] The term "and / or", merely an associative relationship between the associated objects described, indicating that there can be three kinds of relationship, for example, A and / or B, can represent: there is A, there are A and B, there are B three cases. In addition, the character " / " in this paper, generally represents the front and rear associated objects is a "or" relationship.

[0046] The orientation words appearing in the following description are the directions shown in the drawings, and do not limit the specific structure of the battery cell of the present application.

[0047] In addition, the terms "first", "second", and the like in the description and claims of the present application or the above drawings are used to distinguish different objects, and are not used to describe a particular order, which can explicitly or implicitly include one or more of the features.

[0048] In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more (including two), and similarly, "a plurality of groups" means two or more groups (including two groups).

[0049] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting" should be understood in a broad sense, for example, the "connection" or "connecting" of mechanical structures can mean physical connection, for example, the physical connection can be fixed connection, for example, fixed connection by spacer, for example, fixed connection by screws, bolts or other spacers; the physical connection can also be detachable connection, for example, mutual clamping or clamping connection; the physical connection can also be integrally connected, for example, welding, bonding or integrally formed connection. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0050] In order for those skilled in the art to better understand the scheme of the present application, the battery and the battery cell provided by the examples of the present application will be described clearly and completely below in combination with the drawings.

[0051] Exemplarily, the present application provides a battery. Figure 1 For the structure diagram of the battery provided by the examples of the present application, please refer to Figure 1 The battery 100 includes a mounting box 110 and a battery cell 200. The battery cell 200 is fixedly mounted to the mounting box 110, and the mounting box 110 is provided with a liquid cooling plate 120 near one side of the top of the battery cell 200, or the mounting box 110 is provided with a liquid cooling plate 120 near one side of the bottom of the battery cell 200.

[0052] The battery 100 can include a plurality of battery cells 200. The plurality of battery cells 200 can be connected in series, in parallel or in mixed connection. The mixed connection means that there are both series connection and parallel connection among the plurality of battery cells 200. The plurality of battery cells 200 can be directly connected in series, in parallel or in mixed connection. Of course, the battery 100 can also be that the plurality of battery cells 200 are connected in series, in parallel or in mixed connection to form a battery cell module, and the plurality of battery cell modules are connected in series, in parallel or in mixed connection to form a whole. For the specific structure of the battery cell 200, please refer to the relevant description below, which will not be described in detail in the examples of the present application.

[0053] The battery 100 can be a lithium-sulfur battery, a sodium-ion battery or a magnesium-ion battery, or other batteries. The battery 100 can be in a cylindrical shape or a prismatic shape, which is not limited in the examples of the present application.

[0054] The mounting box 110 is similar to the mounting box of the battery in the prior art, which will not be described in detail in the examples of the present application.

[0055] The liquid cooling plate 120 can be arranged on the side of the mounting box body 110 facing the top of the battery cell 200. The liquid cooling plate 120 can be integrally formed with the mounting box body 110, or the liquid cooling plate 120 can be a structure independent of the mounting box body 110. The liquid cooling plate 120 can also be arranged on the side of the mounting box body 110 facing the bottom of the battery cell 200. The liquid cooling plate 120 can be integrally formed with the mounting box body 110, or the liquid cooling plate 120 can be a structure independent of the mounting box body 110.

[0056] The top of the battery cell 200 refers to the end of the battery cell 200 provided with an electrode, and the bottom of the battery cell 200 refers to the end of the battery cell 200 away from the electrode.

[0057] In the examples of the present application, the liquid cooling plate 120 is arranged on the side of the mounting box body 110 corresponding to the top of the battery cell 200, or the liquid cooling plate 120 is arranged on the side of the mounting box body 110 corresponding to the bottom of the battery cell 200, so that a temperature difference is formed between the bottom of the battery cell 200 and the top of the battery cell 200, which facilitates the working medium inside the battery cell 200 to cool the battery cell 200, improves the cooling efficiency of the battery cell 200, and ensures the use safety of the battery cell 200 and the battery 100.

[0058] Since the battery 100 provided in the examples of the present application includes the battery cell 200 provided below, the examples of the present application have the effects of the battery cell 200 provided below.

[0059] Next, the battery cell 200 mentioned in the battery 100 will be described in detail.

[0060] Exemplarily, the examples of the present application provide a battery cell 200 for a battery 100. Figure 2 A structural schematic view of a battery cell in a first perspective provided in the examples of the present application, Figure 3 A partial exploded structural schematic view of a battery cell provided in the examples of the present application, Figure 4 A structural schematic view of a battery cell in a second perspective provided in the examples of the present application, Figure 5 A Figure 4 A sectional view at A-A in the above figure, Figure 6 A Figure 5 A partial enlarged schematic view at A in the above figure.

[0061] Please refer to Figures 1 to 6, the electric core 200 includes a shell assembly 210 and a roll core 220, the shell assembly 210 includes a shell body 212, a cover plate 211 and a bottom plate. The shell body 212 is provided with a first opening and a second opening at two opposite ends respectively, the cover plate 211 is covered to the first opening, and the bottom plate is covered to the second opening. The shell body 212, the cover plate 211 and the bottom plate cooperate to form a mounting cavity for mounting the roll core 220. The shell body 212 includes an evaporation zone 2121 and a condensation zone 2122 which are connected in communication. The evaporation zone 2121 is arranged close to the roll core 220 compared with the condensation zone 2122. The evaporation zone 2121 and the condensation zone 2122 are provided with a working medium.

[0062] The structure of the roll core 220 is similar to that of the roll core in the prior art, and the present application does not make specific limitations on this.

[0063] The electric core 200 can be prismatic or cylindrical, and the present application does not make specific limitations on this.

[0064] The shape of the shell assembly 210 is matched with the shape of the electric core 200, that is, in the case that the electric core 200 is prismatic, the shell assembly 210 is prismatic, and in the case that the electric core 200 is cylindrical, the shell assembly 210 is cylindrical.

[0065] The shell assembly 210 includes the shell body 212, the cover plate 211 and the bottom plate. The shell body 212 includes a first opening and a second opening arranged oppositely, that is, the shell body 212 is in a cylindrical structure. Specifically, the shell body 212 can be prismatic or cylindrical. The shape of the cover plate 211 and the shape of the bottom plate are matched with the shape of the shell body 212. The side of the shell body 212 facing the cover plate 211 is the first opening, and the shell body 212 is covered to the first opening. The side of the shell body 212 facing the bottom plate is the second opening, and the bottom plate can be covered to the second opening. The shell body 212, the bottom plate and the cover plate 211 cooperate to form a mounting cavity to provide a mounting space for the roll core 220. The cover plate 211 and the shell body 212 can be fixedly connected by welding, bonding or the like, and the bottom plate and the shell body 212 can also be fixedly connected by welding, bonding or the like.

[0066] The structure of the cover plate 211 is similar to that of the cover plate in the prior art, and the structure of the bottom plate is similar to that of the bottom plate in the prior art, and the present application does not make specific descriptions on this.

[0067] Please refer to Figure 5 and Figure 6The shell body 212 comprises an evaporation area 2121 and a condensation area 2122 which are connected. The evaporation area 2121 is arranged close to the winding core 220 compared with the condensation area 2122, that is, the evaporation area 2121 and the condensation area 2122 are arranged in a direction away from the winding core 220, and the arrangement direction of the evaporation area 2121 and the condensation area 2122 is perpendicular to the arrangement direction of the cover plate 211 and the bottom plate. The evaporation area 2121 and the condensation area 2122 are provided with different channels for the working medium to move, so as to realize the cooling treatment of the battery cell 200.

[0068] The part corresponding to the winding core 220 of the bottom plate is the bottom of the winding core 220, the part corresponding to the winding core 220 of the cover plate 211 is the top of the winding core 220, and the part corresponding to the winding core 220 of the shell body 212 is the side wall of the winding core 220. The present application only takes the example of the electrode of the battery cell 200 being arranged towards the top of the mounting box 110.

[0069] The evaporation area 2121 and the condensation area 2122 can be arranged corresponding to all the side walls of the winding core 220, or can be arranged corresponding to only part of the side walls of the winding core 220. The present application does not make specific limitation on this.

[0070] The evaporation area 2121 and the condensation area 2122 are both provided with working medium, and the evaporation area 2121 and the condensation area 2122 are connected. The working medium is a medium substance capable of realizing mutual conversion between thermal energy and mechanical energy. In the use process of the battery cell 200, there is a temperature difference between the position close to the battery cell 200 and the position far away from the battery cell 200 of the shell, and the evaporation area 2121 is arranged close to the battery cell 200. Therefore, the working medium in the evaporation area 2121 can be converted from liquid state to gaseous state by the heat generated by the battery cell 200, the working medium in gaseous state is converted into mechanical energy and moves to the condensation area 2122, and the working medium in the condensation area 2122 is converted from gaseous state to liquid state, so as to realize the cooling treatment of the battery cell 200.

[0071] The electrode of the battery cell 200 can be arranged towards the top of the mounting box 110 of the battery 100. The electrode of the battery cell 200 can also be arranged towards the bottom of the mounting box 110 of the battery 100, that is, the battery cell 200 is inverted in the mounting box 110. The present application does not make specific limitation on this.

[0072] In this example, the housing assembly 210 includes a housing body 212, a cover plate 211, and a base plate. The cover plate 211 cooperates with the base plate to cover the first and second openings of the housing body 212, thereby ensuring the reliable connection between the core 220 and the housing assembly 210. Since the housing body 212 includes a connected evaporation zone 2121 and a condensation zone 2122, and a working fluid is provided within the evaporation zone 2121 and the condensation zone 2122, during the use of the battery cell 200, because the evaporation zone 2121 is close to the core 220, the working fluid can absorb heat energy within the evaporation zone 2121 and change from a liquid state to a gaseous state, thereby achieving cooling of the core 220. Furthermore, since there is a temperature difference between the evaporation zone 2121 near the core 220 and the condensation zone 2122 away from the core 220, the working fluid evaporated in the evaporation zone 2121 changes from a liquid state to a liquid state after reaching the condensation zone 2122, making it easier to re-enter the evaporation zone 2121 to cool down the core 220.

[0073] Compared to existing technologies where heat generated by the winding core is transferred to the housing assembly and then to the liquid cooling plate inside the battery via thermally conductive structural adhesive or other structures, in this application example, the cooling of the winding core 220 is achieved through the phase change of the working fluid in the evaporation zone 2121 and the condensation zone 2122. This shortens the heat transfer path of the winding core 220, resulting in higher cooling efficiency for both the winding core 220 and the battery cell 200, reducing the possibility of thermal runaway in the battery cell 200, and ensuring the safety of the battery cell 200. Furthermore, since both the evaporation zone 2121 and the condensation zone 2122 are located on the housing body 212 and integrally formed with it, a separate cooling structure can be avoided, resulting in a simpler structure for the battery cell 200, lower manufacturing costs, and increased energy density of the battery 100.

[0074] Based on this, since the mounting box 110 of the battery 100 is provided with a liquid cooling plate 120 at the top position of the battery cell 200, or the mounting box 110 is provided with a liquid cooling plate 120 at the bottom position of the battery cell 200, the efficiency of the working fluid changing from gaseous to liquid can be accelerated, the cooling efficiency of the working fluid on the winding core 220 can be accelerated, and the cooling efficiency of the battery cell 200 can be accelerated, thus ensuring the safety of the battery cell 200 in use.

[0075] Based on the battery cell 200 provided in the example above, Figure 7 This application provides a schematic diagram of a battery cell from a third-person perspective. Figure 8 for Figure 7 Sectional view at point BB. Figure 9 for Figure 8 A magnified view of a portion of point B in the diagram. Figure 10 for Figure 8 A magnified view of a portion of point C.

[0076] Please refer toFigures 7 to 10 The shell body 212 further comprises a first communication region 2123 and a second communication region 2124. The first communication region 2123 is arranged at a side of the condensation region 2122 and the evaporation region 2121 close to the bottom plate 217, and the first communication region 2123 communicates the condensation region 2122 and the evaporation region 2121. The second communication region 2124 is arranged at a side of the condensation region 2122 and the evaporation region 2121 close to the cover plate 211, and the second communication region 2124 communicates the condensation region 2122 and the evaporation region 2121.

[0077] At least part of the first communication region 2123 and at least part of the second communication region 2124 can be arranged corresponding to the side wall of the winding core 220. That is, along the direction in which the shell body 212 deviates from the winding core 220, the projection of at least part of the first communication region 2123 and the projection of at least part of the second communication region 2124 fall within the projection range of the side wall of the winding core 220.

[0078] In the case where the shell body 212 comprises the first communication region 2123 and the second communication region 2124, the liquid level of the working medium is higher than the side of the first communication region 2123 towards the second communication region 2124, that is, part of the working medium is located in the evaporation region 2121 and the condensation region 2122, and the filling amount of the working medium can be 20% to 45% of the entire volume of the shell body 212, so as to ensure that the working medium can be fully circulated. The entire volume of the shell body 212 refers to the sum of the volumes of all the channels in the evaporation region 2121, all the channels in the condensation region 2122, the first communication region 2123 and the second communication region 2124.

[0079] In the case where the evaporation region 2121 and the condensation region 2122 are both channels, the spacing structure between two adjacent channels of the evaporation region 2121, the spacing structure between two adjacent channels of the condensation region 2122, and the spacing structure between the evaporation region 2121 and the condensation region 2122 are all provided with first through holes, and the first through holes are arranged close to the bottom plate 217. These first through holes can be arranged on the same straight line or staggered, and the present application does not make a specific limitation thereon, as long as the first through holes can realize the communication between the evaporation region 2121 and the condensation region 2122 at a position close to the bottom plate 217.

[0080] The spacing structure between two adjacent channels of the evaporation region 2121, the spacing structure between two adjacent channels of the condensation region 2122, and the spacing structure between the evaporation region 2121 and the condensation region 2122 are all provided with second through holes, and the second through holes are arranged close to the cover plate 211. These second through holes can be arranged on the same straight line or staggered, and the present application does not make a specific limitation thereon, as long as the second through holes can realize the communication between the evaporation region 2121 and the condensation region 2122 at a position close to the cover plate 211. A plurality of first through holes cooperatively form the first communication region 2123, and a plurality of second through holes cooperatively form the second communication region 2124.

[0081] The first communication area 2123 can be a groove-like structure close to the bottom plate 217, and the groove of the first communication area 2123 is arranged towards the evaporation area 2121 and the condensation area 2122, so as to communicate the evaporation area 2121 and the condensation area 2122 at a position close to the bottom plate 217. The second communication area 2124 can be a groove-like structure close to the cover plate 211, and the groove of the second communication area 2124 is arranged towards the opposite direction of the groove of the first communication area 2123, that is, the groove of the second communication area 2124 is arranged towards the evaporation area 2121 and the condensation area 2122, so as to communicate the evaporation area 2121 and the condensation area 2122 at a position close to the cover plate 211.

[0082] In the example of the present application, the second communication area 2124 is arranged at the side of the evaporation area 2121 and the condensation area 2122 close to the cover plate 211, so that the evaporation area 2121 and the condensation area 2122 are communicated at a position close to the cover plate 211, and then the working medium converted into gaseous state in the evaporation area 2121 due to the heat emitted by the winding core 220 can enter the condensation area 2122 through the second communication area 2124. The first communication area 2123 is arranged at the side of the evaporation area 2121 and the condensation area 2122 close to the bottom plate 217, so that the evaporation area 2121 and the condensation area 2122 are communicated at a position close to the bottom plate 217, and then the working medium liquefied in the condensation area 2122 can re-enter the evaporation area 2121 through the first communication area 2123, so as to complete the circulation of the working medium in the condensation area 2122 and the evaporation area 2121, and improve the utilization rate of the working medium.

[0083] Based on the above-mentioned example of the electric core 200, please refer to Figure 2 and Figure 7 The shell assembly 210 is provided with a filling hole 2111, and the filling hole 2111 is communicated with the evaporation area 2121 and / or the condensation area 2122.

[0084] The filling hole 2111 can be arranged on the cover plate 211 or the bottom plate 217, so as to realize the communication between the filling hole 2111 and the evaporation area 2121 and / or the condensation area 2122. In the case of being provided with the first communication area 2123 and the second communication area 2124, if the filling hole 2111 is arranged on the cover plate 211, the filling hole 2111 can communicate the evaporation area 2121 and the condensation area 2122 through the second communication area 2124. If the filling hole 2111 is arranged on the bottom plate 217, the filling hole 2111 can communicate the evaporation area 2121 and the condensation area 2122 through the first communication area 2123.

[0085] After the filling is completed, the filling hole 2111 is sealed, so as to reduce the possibility that the impurities such as external air, water and dust enter the inside of the shell through the filling hole 2111 and affect the working medium. The filling hole 2111 can be sealed by means of arranging a plugging structure, welding treatment and the like.

[0086] In the example, the evaporation area 2121, the condensation area 2122, the first communication area 2123 and the second communication area 2124 in the shell body 212 can be vacuumized through the filling hole 2111. After the vacuumization, the working medium is filled into the shell body 212 through the filling hole 2111 to ensure the reliability of the phase change conversion of the working medium and further improve the efficiency of the shell body 212 in cooling the winding core 220.

[0087] Based on the above example, please refer to Figure 5 With Figure 6 , the evaporation area 2121 includes a plurality of evaporation channels arranged at intervals, one end of the evaporation channel is in communication with the first communication area 2123, and the other end of the evaporation channel is in communication with the second communication area 2124. The condensation area 2122 includes at least one condensation channel, one end of the condensation channel is in communication with the first communication area 2123, and the other end of the condensation channel is in communication with the second communication area 2124. The cross-sectional area of the condensation channel is greater than the cross-sectional area of the evaporation channel.

[0088] The shell body 212 is formed by processing an extruded profile. The cross section of the evaporation channel can be circular or semicircular, or polygonal such as triangular, rectangular, trapezoidal, etc. The cross section of the condensation channel can be circular or semicircular, or polygonal such as triangular, rectangular, trapezoidal, etc. The corresponding shape of the cross section of the condensation channel can be the same as or different from the corresponding shape of the cross section of the evaporation channel, which is not specifically limited in the example. Along the arrangement direction of the evaporation area 2121 and the condensation area 2122, the evaporation channels and the condensation channels can be arranged alternately to enhance the use strength of the shell body 212.

[0089] Illustratively, when the cross section of the evaporation channel is rectangular, the processing of the evaporation channel is relatively simple, the capillary performance is relatively balanced, and the cooling effect of the shell body 212 on the winding core 220 is good. When the cross section of the evaporation channel is trapezoidal, the evaporation channel can balance the capillary force and flow resistance, and the cooling effect of the shell body 212 on the winding core 220 is good. When the cross section of the evaporation channel is triangular or V-shaped groove, the evaporation channel can also balance the capillary force and flow resistance, and the cooling effect of the shell body 212 on the winding core 220 is good.

[0090] When the corresponding shape of the cross section of the evaporation channel is circular, the diameter of the circle is less than 1 mm. When the corresponding shape of the cross section of the evaporation channel is polygonal, the maximum side length of the polygon is less than 1 mm, i.e. the evaporation channel is set as a capillary structure. When the corresponding shape of the cross section of the condensation channel is circular, the diameter of the circle is greater than 5 mm. When the corresponding shape of the cross section of the condensation channel is polygonal, the maximum side length of the polygon is greater than 5 mm.

[0091] Along the cross-sectional area of the shell body 212, the evaporation zone 2121 can account for 60%~70% of the cross-sectional area of the shell body 212, and the condensation zone 2122 accounts for 30%~40% of the cross-sectional area of the shell body 212.

[0092] Next, the principle of setting the cross-sectional area of the condensation channel to be greater than the cross-sectional area of the evaporation channel, which can accelerate the efficiency of the working medium to complete the phase change conversion, and improve the cooling efficiency of the shell body 212 on the winding core 220 is analyzed.

[0093] Since the evaporation channel is a capillary structure, there is a capillary pressure inside the evaporation channel, and the driving force of capillary action is the capillary pressure, and its calculation formula is: Formula 1 In formula 1, P is the capillary pressure, σ is the surface tension coefficient of the working medium, θ is the contact angle between the working medium and the inner surface of the evaporation channel, and r is the effective radius of the evaporation channel. c e

[0094] Based on the above formula 1, it can be known that the smaller the effective radius r of the evaporation channel e , the greater the capillary pressure P c . Therefore, the smaller the size of the cross section of the evaporation channel, the greater the capillary pressure, and through the greater capillary pressure, the working medium heated to become working medium vapor can overcome the gravity and flow resistance, wet the inner surface of the evaporation channel and the condensation channel, improve the efficiency of the working medium vapor liquefaction, and further improve the cooling efficiency of the working medium through the shell body 212 on the winding core 220.

[0095] The shape of the evaporation channel determines the effective radius r of the evaporation channel e . For the evaporation channel with a non-circular cross section, the effective radius r e is usually defined as twice the hydraulic radius, that is: Formula 2 In formula 2, A is the cross-sectional area of the evaporation channel, and P is the wet perimeter of the evaporation channel, that is, the length of the contact between the working medium and the inner surface of the evaporation channel.

[0096] Based on the above formula 1 and formula 2, it can be known that the smaller the wet perimeter of the evaporation channel, the smaller the effective radius r of the evaporation channel e , and the greater the capillary pressure P c . Therefore, the smaller the size of the cross section of the evaporation channel, the greater the capillary pressure, and through the greater capillary pressure, the working medium heated to become working medium vapor can overcome the gravity and flow resistance, wet the inner surface of the evaporation channel and the condensation channel, improve the efficiency of the working medium vapor liquefaction, and further improve the cooling efficiency of the working medium through the shell body on the winding core.

[0097] The effective radius r of the evaporation channel​​e The value can range from 0.05 mm. <r e <0.4 mm. When the effective radius r of the evaporation channel e When the diameter is ≤0.05 mm, the capillary force of the evaporation channel is strong, but it is difficult to process, and the evaporation channel is prone to blockage during the use of the 200 cell. However, when the effective radius r of the evaporation channel... e When the thickness is ≥0.4 mm, the capillary force of the evaporation channel is weak, which may cause the cooling effect of the shell body 212 on the core 220 to fail, affecting the reliability of the battery cell 200.

[0098] In this example, by setting the cross-sectional area of ​​the condensation channel to be larger than that of the evaporation channel, the capillary pressure in the condensation channel is increased. The increased capillary pressure allows the working fluid heated to become working fluid vapor to overcome gravity and flow resistance, wet the inner surfaces of the evaporation channel and the condensation channel, improve the efficiency of working fluid vapor liquefaction, accelerate the efficiency of working fluid to complete phase change conversion, and thus improve the cooling efficiency of the working fluid through the shell body 212 on the core 220.

[0099] Furthermore, in this example, the evaporation zone 2121 includes multiple spaced evaporation channels, and the condensation zone 2122 includes multiple spaced condensation channels. Therefore, during the use of the battery cell 200, if the battery cell 200 deforms in the later stages of use, the deformation of the evaporation channels and condensation channels provided on the shell body 212 can reduce the magnitude of the deformation of the entire battery cell 200.

[0100] Based on the battery cell 200 provided in the above example, the inner wall of the evaporation channel is provided with a first hydrophilic film (not shown in the figure), and / or, the inner wall of the condensation channel is provided with a second hydrophilic film (not shown in the figure).

[0101] Based on Formula 1 above, it can be seen that the smaller the contact angle θ between the working fluid and the inner surface of the evaporation channel, the stronger the capillary pressure, and the easier it is for the working fluid vapor to wet the inner surface of the evaporation channel. Therefore, by setting a hydrophilic film, the contact angle θ between the working fluid and the inner surface of the evaporation channel can be made smaller, thereby increasing the capillary pressure.

[0102] Taking the shell body 212 as an example made of aluminum and aluminum alloy, the first hydrophilic film can be a hydrophilic oxide layer formed on the inner surface of the evaporation channel by chemical oxidation, and the second hydrophilic film can be a hydrophilic oxide layer formed on the inner surface of the condensation channel by chemical oxidation. The specific forming method of the first hydrophilic film and the second hydrophilic film is not limited in the example of this application.

[0103] In this application example, by providing a first hydrophilic film on the inner wall of the evaporation channel, the efficiency of working fluid vapor liquefaction can be increased, the efficiency of working fluid phase change can be accelerated, and thus the cooling efficiency of the working fluid on the winding core 220 through the shell body 212 can be improved. By providing a second hydrophilic film on the inner wall of the condensation channel, the efficiency of working fluid vapor liquefaction can be increased, the efficiency of working fluid phase change can be accelerated, and thus the cooling efficiency of the working fluid on the winding core 220 through the shell body 212 can be improved.

[0104] Based on the battery cell 200 provided in the above example, a first hydrophilic film may be provided only on the inner wall of the evaporation channel, or a second hydrophilic film may be provided only on the inner wall of the condensation channel, or both a first hydrophilic film and a second hydrophilic film may be provided on the inner wall of the evaporation channel. This application example does not impose specific limitations on this.

[0105] Based on the battery cell 200 provided in the example above, please refer to... Figures 4 to 6 Taking the shell body 212 as an example of a rectangular cylindrical structure, the shell body 212 includes a first side wall and a second side wall arranged opposite to each other, and a third side wall and a fourth side wall arranged opposite to each other. The third side wall connects one side of the first side wall and one side of the second side wall, and the fourth side wall connects the other side of the first side wall and the other side of the second side wall. At least one of the first side wall, the second side wall, the third side wall, and the side wall between the third side wall is provided with an evaporation zone 2121 and a condensation zone 2122.

[0106] The first, second, third, and fourth sidewalls can be integrally formed or fixedly connected by welding or other methods; this application example does not impose specific limitations on this. The integrally formed shell body 212 ensures high reliability of the connection between the first, second, third, and fourth sidewalls, avoiding the occurrence of low reliability of the connection between the first, second, third, and fourth sidewalls due to external forces during the use of the battery cell 200.

[0107] The evaporation zone 2121 and the condensation zone 2122 may be located on any one of the first sidewall, the second sidewall, the third sidewall, and the fourth sidewall. Alternatively, the evaporation zone 2121 and the condensation zone 2122 may be located on any two of the first sidewall, the second sidewall, the third sidewall, and the fourth sidewall. Alternatively, the evaporation zone 2121 and the condensation zone 2122 may be located on any three of the first sidewall, the second sidewall, the third sidewall, and the fourth sidewall. Furthermore, the evaporation zone 2121 and the condensation zone 2122 may also be located on the first sidewall, the second sidewall, the third sidewall, and the fourth sidewall. This application example does not impose specific limitations in this regard.

[0108] In the examples of the present application, the first side wall is arranged opposite the second side wall, the third side wall is arranged opposite the fourth side wall, and the third side wall and the fourth side wall cooperate to connect the first side wall and the second side wall from different positions, thereby achieving reliable connection of the first side wall, the second side wall, the third side wall, and the fourth side wall. By arranging the evaporation area 2121 and the condensation area 2122 in at least one of the first side wall, the second side wall, the third side wall, and the fourth side wall, the contact between the winding core 220 and the evaporation area 2121 is achieved, and then the working medium in the evaporation area 2121 in contact with the winding core 220 undergoes phase change, thereby improving the efficiency of the working medium in cooling the winding core 220 by the shell body 212.

[0109] The more side walls provided with the evaporation area 2121 and the condensation area 2122, the greater the contact area between the winding core 220 and the evaporation area 2121, and the more the working medium in the evaporation area 2121 in contact with the winding core 220 undergoes phase change, thereby improving the efficiency of the working medium in cooling the winding core 220 by the shell body 212.

[0110] In the case where the evaporation area 2121 and the condensation area 2122 are arranged on all side walls of the shell body 212, during use of the battery cell 200, the heat generated by the winding core 220 can be transferred to the entire shell assembly 210 through the phase change of the working medium in the evaporation area 2121, thereby reducing the temperature difference at different positions of the shell, ensuring the use performance of the battery cell 200, and prolonging the service life of the battery cell 200.

[0111] In addition, in the examples of the present application, the evaporation area 2121 and the condensation area 2122 are arranged on all side walls of the shell body 212, so that the temperature difference at different positions of the shell assembly 210 is small, and in combination with the liquid cooling plate 120 arranged in the battery 100, the cooling efficiency of the battery cell 200 can be further improved, and the possibility of thermal runaway of the battery cell 200 can be reduced.

[0112] Based on the above examples of the battery cell 200, please refer to Figures 4 to 6 The connection between the first side wall and the third side wall is provided with a first reinforcing structure, and the connection between the first side wall and the fourth side wall is provided with a second reinforcing structure.

[0113] The first reinforcing structure is similar to the second reinforcing structure, and the examples of the present application only describe the first reinforcing structure as an example.

[0114] The evaporation area 2121 corresponding to the first side wall and the evaporation area 2121 corresponding to the third side wall are two independent areas, and the two evaporation areas 2121 are not communicated. In this case, the first reinforcing structure can be a columnar structure connecting the first side wall and the third side wall. The connection between the first side wall and the third side wall can also communicate the evaporation area 2121 corresponding to the first side wall and the evaporation area 2121 corresponding to the third side wall. In this case, the first reinforcing structure can include a plurality of reinforcing ribs arranged at intervals, and the plurality of reinforcing ribs are arranged in the direction of the cover plate 211 towards the bottom plate 217.

[0115] The connection between the second side wall and the third side wall can be provided with a fourth reinforcing structure similar to the first reinforcing structure, and the connection between the second side wall and the fourth side wall can be provided with a fifth reinforcing structure similar to the first reinforcing structure. The present application does not make specific limitations on this.

[0116] In the examples of the present application, by arranging the first reinforcing structure at the connection between the first side wall and the third side wall, the connection reliability of the first side wall and the third side wall can be ensured, the strength of the connection between the first side wall and the third side wall can be improved, and the possibility of damage to the connection between the first side wall and the third side wall during use can be reduced, thereby ensuring the use reliability of the shell body 212. By arranging the second reinforcing structure at the connection between the first side wall and the fourth side wall, the connection reliability of the first side wall and the fourth side wall can be ensured, the strength of the connection between the first side wall and the fourth side wall can be improved, and the possibility of damage to the connection between the first side wall and the fourth side wall during use can be reduced, thereby ensuring the use reliability of the shell body 212.

[0117] Based on the above examples of the electric core 200, please refer to Figures 4 to 6 The shell body 212 includes an inner plate 213, an outer plate 215 and a spacing plate 214 arranged at intervals, the spacing plate 214 is arranged between the inner plate 213 and the outer plate 215, the inner plate 213 is arranged closer to the winding core 220 than the outer plate 215, the inner plate 213 and the spacing plate 214 cooperate to form an evaporation area 2121, and the outer plate 215 and the spacing plate 214 cooperate to form a condensation area 2122. A plurality of third reinforcing structures 216 are arranged in the condensation area 2122, a first side of the third reinforcing structure 216 is connected to the spacing plate 214, a second side of the third reinforcing structure 216 is connected to the outer plate 215, or the second side of the third reinforcing structure 216 can abut to the outer plate 215.

[0118] The inner plate 213 and the spacing plate 214 cooperate to form the evaporation area 2121 on the side of the inner plate 213, and a plurality of evaporation channels can be arranged at intervals in the direction of the inner plate 213 towards the spacing plate 214. The outer plate 215 and the spacing plate 214 cooperate to form the condensation area 2122 on the side of the outer plate 215, and a plurality of condensation channels can be arranged at intervals in the direction of the outer plate 215 towards the spacing plate 214.

[0119] The third reinforcing structure 216 can be a convex structure such as a convex rib, a convex strip, a convex point, or the like provided on the partition plate 214.

[0120] The third reinforcing structure 216 can be provided in multiple numbers with equal or unequal distances between adjacent two third reinforcing structures 216, and the present application does not make a specific limitation on this as long as the cross section of the condensation channel between adjacent two third reinforcing structures 216 is greater than that of the evaporation channel.

[0121] The side of the third reinforcing structure 216 facing the partition plate 214 is fixed to the partition plate 214, which can be fixed and connected by welding, insertion or the like, or the third reinforcing structure 216 can be integrally formed with the partition plate 214, and the present application does not make a specific limitation on this. The side of the third reinforcing plate facing the outer plate 215 can be fixedly connected to the outer plate 215 or provided spaced apart from the outer plate 215.

[0122] In the present application, the shell body 212 includes the outer plate 215, the partition plate 214 and the inner plate 213 provided spaced apart, the side of the partition plate 214 facing the inner plate 213 cooperates with the inner plate 213 to form an evaporation area 2121, and since the inner plate 213 is arranged closer to the winding core 220 than the outer plate 215, the winding core 220 can be in contact with the evaporation area 2121 through the inner plate 213, so that the working medium in the evaporation area 2121 can be phase changed to cool the winding core 220. The side of the partition plate 214 facing the outer plate 215 cooperates with the outer plate 215 to form a condensation area 2122, so that the working medium vapor can be liquefied in the condensation area 2122, facilitating the working medium to cool the winding core 220 again. Since the third reinforcing structure 216 is provided between the outer plate 215 and the partition plate 214, the third reinforcing structure 216 can provide support to the outer plate 215, and in the use process of the shell body 212, the amplitude of deformation of the outer plate 215 caused by external force can be reduced, thereby ensuring the use reliability of the shell body 212 and the battery cell 200.

[0123] Based on the battery cell 200 provided in the above example, the shell assembly 210 further includes a first sealing structure, a second sealing structure, a third sealing structure and a fourth sealing structure (not shown in the figure). The first sealing structure is provided on the side of the inner plate 213 close to the winding core, one side of the first sealing structure is connected to the cover plate 211, and the other side of the first sealing structure is connected to the inner plate 213. The second sealing structure is provided on the side of the outer plate 215 away from the winding core, one side of the second sealing structure is connected to the cover plate 211, and the other side of the second sealing structure is connected to the outer plate 215.

[0124] The first sealing structure and the second sealing structure can be sealing rings, or can be welds between the shell body 212 and the cover plate 211. In the present example, the first sealing structure and the second sealing structure are described as being welds between the shell body 212 and the cover plate 211.

[0125] In the case where the first communication region 2123 and the second communication region 2124 are both groove-shaped structures, the size of the first communication region 2123 is greater than the weld penetration depth at the bottom plate 217 when the bottom plate 217 is welded to the shell body 212, and the size of the second communication region 2124 is greater than the weld penetration depth at the cover plate 211 when the cover plate 211 is welded to the shell body 212, in the direction from the cover plate 211 to the bottom plate 217. This ensures the reliability of the connection between the bottom plate 217, the shell body 212, and the cover plate 211, and the sealing performance between the shell body 212 and the bottom plate 217, and between the shell body 212 and the cover plate 211.

[0126] The third sealing structure is arranged on the side of the inner plate 213 that is close to the winding core, one side of the third sealing structure is connected to the bottom plate 217, and the other side of the third sealing structure is connected to the inner plate 213. The fourth sealing structure is arranged on the side of the outer plate 215 that is away from the winding core, one side of the fourth sealing structure is connected to the bottom plate 217, and the other side of the fourth sealing structure is connected to the outer plate 215.

[0127] In the present example, the first sealing structure is arranged at the connection between the cover plate 211 and the inner plate 213, which reduces the possibility of the working medium entering the installation cavity from the connection between the cover plate 211 and the inner plate 213, thereby ensuring the use performance of the winding core 220. The second sealing structure is arranged at the connection between the cover plate 211 and the outer plate 215, which reduces the possibility of the working medium leaking out of the shell body 212 from the connection between the cover plate 211 and the outer plate 215, and also reduces the possibility of impurities such as external air and water entering the shell body 212 from the connection between the cover plate 211 and the outer plate 215, thereby ensuring the use performance of the working medium. The third sealing structure is similar to the first sealing structure and has a similar effect, and the fourth sealing structure is similar to the second sealing structure and has a similar effect, which will not be described in detail in the present example.

[0128] Based on the above example, the working medium includes one of water, acetone, methanol, and a hydrofluorocarbon chemical refrigerant.

[0129] The hydrofluorocarbon chemical refrigerant can include any one of an R-134a refrigerant (tetrafluoroethane), an R-32 refrigerant (difluoromethane), an R410A refrigerant, an R-404A refrigerant, an R-1234yf refrigerant, and the like.

[0130] Based on the characteristics of the different working fluids, the surface tension coefficient of water is higher, and the latent heat of vaporization is larger, which can improve the cooling efficiency of the shell body 212 on the winding core 220. Because the boiling point and freezing point of acetone are lower, acetone can be used for cooling the winding core 220 in a low-temperature environment. Because the freezing point of methanol is low, and the boiling point of methanol is high, when the working fluid is methanol, the applicable temperature range is larger. The hydrogen fluoride hydrocarbon chemical refrigerant has a smooth saturation vapor pressure curve, so the stability of the hydrogen fluoride hydrocarbon chemical refrigerant is higher. Therefore, according to the use requirements of the user, the corresponding working fluid can be selected to meet the different needs of the user and improve the user experience.

[0131] Finally, it should be noted that the above embodiments are only specific implementations of the present application, but the protection scope of the present application is not limited thereto. Any changes or replacements within the technical scope disclosed in the present application should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A battery cell, characterized in that, For use in batteries, the battery cell includes a housing assembly and a winding core, the housing assembly including a housing body, a cover plate and a bottom plate; The shell body has a first opening and a second opening at its two opposite ends. The cover plate covers the first opening, and the bottom plate covers the second opening. The shell body, the cover plate, and the bottom plate cooperate to form an installation cavity, which is used to install the winding core. The shell body includes an evaporation zone and a condensation zone that are connected to each other. The evaporation zone is located closer to the core than the condensation zone. The evaporation zone and the condensation zone contain working fluid.

2. The battery cell according to claim 1, characterized in that, The shell body also includes: A first connecting region is located on the side of the condensation region and the evaporation region near the bottom plate, and the first connecting region connects the condensation region and the evaporation region; The second connecting region is located on the side of the condensation zone and the evaporation zone near the cover plate, and the second connecting region connects the condensation zone and the evaporation zone.

3. The battery cell according to claim 2, characterized in that, The evaporation zone includes a plurality of evaporation channels spaced apart, one end of each evaporation channel being connected to the first connecting area and the other end of each evaporation channel being connected to the second connecting area; The condensation zone includes at least one condensation channel, one end of which is connected to the first connecting area, and the other end of which is connected to the second connecting area. The cross-sectional area of ​​the condensation channel is larger than that of the evaporation channel.

4. The battery cell according to claim 3, characterized in that, The inner wall of the evaporation channel is provided with a first hydrophilic film, and / or the inner wall of the condensation channel is provided with a second hydrophilic film.

5. The battery cell according to claim 1, characterized in that, The shell body includes a first sidewall and a second sidewall disposed opposite to each other, and a third sidewall and a fourth sidewall disposed opposite to each other. The third sidewall connects one side of the first sidewall and one side of the second sidewall, and the fourth sidewall connects the other side of the first sidewall and the other side of the second sidewall. At least one of the first sidewall, the second sidewall, the third sidewall, and the sidewall between the third sidewalls is provided with the evaporation zone and the condensation zone.

6. The battery cell according to claim 5, characterized in that, A first reinforcing structure is provided at the connection between the first sidewall and the third sidewall, and a second reinforcing structure is provided at the connection between the first sidewall and the fourth sidewall.

7. The battery cell according to any one of claims 1 to 6, characterized in that, The shell body includes an inner plate, an outer plate, and a spacer plate arranged at intervals. The spacer plate is disposed between the inner plate and the outer plate. The inner plate is disposed closer to the core than the outer plate. The inner plate and the spacer plate cooperate to form the evaporation zone, and the outer plate and the spacer plate cooperate to form the condensation zone. The condensation zone is provided with a plurality of third reinforcing structures. The first side of the third reinforcing structure is connected to the partition plate, and the second side of the third reinforcing structure is connected to the outer plate, or the second side of the third reinforcing structure can abut against the outer plate.

8. The battery cell according to claim 7, characterized in that, The housing assembly further includes a first sealing structure, a second sealing structure, a third sealing structure, and a fourth sealing structure; The first sealing structure is disposed on the inner plate near the core, one side of the first sealing structure is connected to the cover plate, and the other side of the first sealing structure is connected to the inner plate; The second sealing structure is located on the side of the outer plate away from the core, one side of the second sealing structure is connected to the cover plate, and the other side of the second sealing structure is connected to the outer plate; The third sealing structure is located on the inner plate near the core, one side of the third sealing structure is connected to the bottom plate, and the other side of the third sealing structure is connected to the inner plate; The fourth sealing structure is located on the side of the outer plate away from the core. One side of the fourth sealing structure is connected to the bottom plate, and the other side of the fourth sealing structure is connected to the outer plate.

9. The battery cell according to claim 1, characterized in that, The working fluid includes one of water, acetone, methanol, and hydrofluorocarbon chemical refrigerants.

10. A battery, characterized in that, The battery includes a mounting housing and a battery cell as described in any one of claims 1 to 9. The battery cell is fixedly mounted to the mounting housing. The mounting housing is provided with a liquid cooling plate on the side near the top of the battery cell, or the mounting housing is provided with a liquid cooling plate on the side near the bottom of the battery cell.

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