Battery unit and battery pack

Abstract

Disclosed in the present application are a battery unit and a battery pack, which solve the technical problem in the prior art of unbalanced heat dissipation of the battery pack. The battery unit comprises a battery module with a housing, and a heat exchange tank, wherein a lower end of the battery module is arranged in the heat exchange tank, and a gap is provided between the housing and a tank wall and / or a bottom wall of the heat exchange tank; the housing is sealingly connected to the tank wall of the heat exchange tank, such that a heat exchange channel is formed between the housing and the heat exchange tank; and first medium through holes are provided in two opposite ends of the heat exchange tank, and a thermally conductive medium flows into the heat exchange channel through the first medium through hole in one end of the heat exchange tank and then flows out of the heat exchange channel through the first medium through hole in the other end of the heat exchange tank. The battery pack comprises at least one battery unit. In the present application, the overall temperature change of the battery module is more balanced, and the battery module and the heat exchange tank are modular, which are convenient for overhaul.

Description

Battery cell and battery pack Technical Field

[0001] The present application belongs to the technical field of vehicle battery packs, and specifically relates to a battery cell and a battery pack. Background Art

[0002] The internal cooling system of the battery pack generally consists of a liquid cooling plate and a thermal pad. The coolant is driven by a water pump to flow inside the liquid cooling plate, thereby taking away the heat from the battery module.

[0003] The liquid cooling plate is designed according to the arrangement of the modules in the battery pack. It is mostly composed of a harmonica tube heat dissipation body and a surrounding liquid collecting pipe. That is, the liquid cooling plate is arranged as a whole under the battery pack. The diameter of the harmonica tube in the liquid cooling plate is small, and the flow rate in the harmonica tube is correspondingly fast. This makes it impossible for some battery packs close to the downstream of the harmonica tube to obtain a good heat dissipation effect, resulting in a large deviation in the heat dissipation of the battery pack. Summary of the Invention

[0004] In order to solve the current technical problem of uneven heat dissipation in battery packs, the present application provides a battery unit and a battery pack.

[0005] In a first aspect of the present application, a battery cell is provided, comprising:

[0006] A battery module having a housing;

[0007] A heat exchange tank, wherein the lower end of the battery module is disposed in the heat exchange tank, and a gap is provided between the outer shell and the tank wall and / or bottom wall of the heat exchange tank; the outer shell is sealedly connected to the tank wall of the heat exchange tank to form a heat exchange channel between the outer shell and the heat exchange tank, and first medium through holes are provided at opposite ends of the heat exchange tank, and a heat-conducting medium flows into the heat exchange channel through the first medium through hole at one end of the heat exchange tank and then flows out of the heat exchange channel through the first medium through hole at the other end of the heat exchange tank.

[0008] In some embodiments, mounting portions are provided at opposite ends of the heat exchange tank, protrusions corresponding to the mounting portions are provided at opposite ends of the housing, and bottom surfaces of the protrusions are connected to top surfaces of the mounting portions.

[0009] In some embodiments, the first medium through hole is provided in the mounting portion.

[0010] In some embodiments, one opening of the first medium through hole is provided on the bottom surface of the mounting portion, and the other opening of the first medium through hole is provided on the inner wall of the heat exchange groove.

[0011] In some embodiments, the opening height of the first medium through hole is lower than the slot opening of the heat exchange slot.

[0012] In some embodiments, the first medium through holes are provided at both ends of the heat exchange groove in the length direction; the inner wall of the heat exchange groove is provided with guide ribs, and the guide ribs are arranged along the length direction of the shell.

[0013] In some embodiments, the outer wall of the shell is welded to the cavity wall of the heat exchange groove, so that the heat exchange channel is only connected to the first medium through hole.

[0014] In a second aspect of the present application, a battery pack is provided, comprising at least one battery cell.

[0015] In some embodiments, the battery pack further includes a frame structure, an upper cover, and a circuit assembly. The frame structure includes two oppositely arranged side beams and a cross beam connected to the side beams. One side of the side beam is provided with a mounting hole for connecting to a vehicle, and the other side of the side beam is provided with a collecting groove. The opposite ends of the battery cell are respectively connected to one of the side beams, and the first medium through hole is connected to the corresponding collecting groove.

[0016] In some embodiments, the collecting tank is provided with a second medium through hole corresponding to the first medium through hole, and a sealing member is provided between the first medium through hole and the second medium through hole.

[0017] The battery unit provided in accordance with one or more embodiments of the present application is sealedly connected to the groove wall of the heat exchange groove through the outer shell to form a heat exchange channel between the outer shell and the heat exchange groove. The lower end of the outer shell of the battery module is located in the concave cavity of the heat exchange groove, that is, when the heat-conducting medium flows in the heat exchange channel, the heat-conducting medium is in direct contact with the battery module, and the heat-conducting medium and the battery module are exchanged with heat through the outer shell. On the one hand, the width of the battery module is larger than the diameter of the harmonica tube in the liquid cooling plate in the prior art, and the cross-sectional area of ​​the heat exchange channel between the outer shell and the inner wall of the concave cavity is also larger, and the heat-conducting medium in the heat exchange channel is larger. The flow rate will slow down, and even the heat-conducting medium downstream of the heat exchange channel will have enough time to exchange heat with the shell, making the overall temperature change of the battery module more balanced. At the same time, the heat-conducting medium is in direct contact with the bottom surface of the battery module, and the heat conduction efficiency between the shell and the heat-conducting medium will be improved. On the other hand, the heat exchange groove provides a heat exchange channel for a single battery module to exchange heat, that is, the heat exchange of each battery cell is independent. When the heat dissipation or heating of the battery pack fails, the single battery cell can be inspected and repaired, the fault location can be accurately obtained, and it can be replaced, which will greatly improve the inspection efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] FIG1 shows a schematic structural diagram of a battery unit in one or more embodiments of the present application.

[0019] FIG2 shows a schematic cross-sectional structural diagram of the battery unit in FIG1 .

[0020] FIG3 shows an enlarged schematic diagram of point A in FIG2 .

[0021] FIG4 shows a schematic structural diagram of a battery pack in one or more embodiments of the present application.

[0022] FIG5 shows a schematic structural diagram of the battery pack in FIG4 from another perspective.

[0023] FIG6 shows a schematic diagram of the connection between the battery unit and the side beam in FIG1 .

[0024] Explanation of the reference numerals: 100 - battery cell, 110 - battery module, 111 - shell, 112 - protrusion, 120 - heat exchange groove, 121 - heat exchange channel, 122 - first medium through hole, 123 - installation part, 200 - frame structure, 210 - side beam, 211 - collecting groove, 212 - mounting hole, 213 - connecting plate, 220 - cross beam, 221 - control cabin, 300 - seal. DETAILED DESCRIPTION

[0025] In order to enable those skilled in the art to understand the present application more clearly, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of this application.

[0026] Figure 1 is a schematic diagram of the structure of a battery cell in one or more embodiments of the present application. Figure 2 is a schematic diagram of the cross-sectional structure of the battery cell in Figure 1. Figure 3 is an enlarged schematic diagram of point A in Figure 2. Figure 4 is a schematic diagram of the structure of a battery pack in one or more embodiments of the present application. Figure 5 is a schematic diagram of the structure of the battery pack in Figure 4 from another perspective. Figure 6 is a schematic diagram of the connection between the battery cell and the side beam in Figure 1.

[0027] Please refer to Figures 1-3. The first embodiment of the present application provides a battery unit, including a battery module 110 and a heat exchange tank 120. The battery module 110 has a shell 111, and the battery cell is arranged in the shell 111, wherein the battery cell is a device capable of storing electrical energy.

[0028] The heat exchange tank 120 has a concave cavity for accommodating a heat-conducting medium. The lower end of the battery module 110 is disposed within the concave cavity of the heat exchange tank 120. The outer shell 111 is sealed to the wall of the heat exchange tank 120, forming a heat exchange channel 121 for the heat-conducting medium to flow between the outer shell 111 and the heat exchange tank 120. First medium through-holes 122 are provided at opposite ends of the heat exchange tank 120. The heat-conducting medium flows into the heat exchange channel 121 through the first medium through-hole 122 at one end of the heat exchange tank 120 and then exits the heat exchange channel 121 through the first medium through-hole 122 at the other end of the heat exchange tank 120.

[0029] The lower end of the outer shell 111 of the battery module 110 is located in the concave cavity of the heat exchange groove 120, that is, when the heat-conducting medium flows in the heat exchange channel 121, the heat-conducting medium directly contacts the battery module 110, and the heat-conducting medium exchanges heat with the battery cells in the battery module 110 through the outer shell 111.

[0030] On the one hand, the heat-conducting medium is in direct contact with the bottom surface of the battery module 110, and the heat conduction efficiency between the outer shell 111 and the heat-conducting medium is high; and the width of the battery module 110 is larger than the diameter of the harmonica tube in the liquid cooling plate in the prior art, and the cross-sectional area of ​​the heat exchange channel 121 between the outer shell 111 and the inner wall of the heat exchange tank 120 is also larger, and the flow rate of the heat-conducting medium in the heat exchange channel 121 will become slower. Even the heat-conducting medium downstream of the heat exchange channel 121 has enough time to exchange heat with the outer shell 111, so that the overall temperature change of the battery module 110 is more balanced, and the temperature difference between the opposite ends of the battery module 110 is also smaller, and the battery unit 100 has high safety and long service life.

[0031] On the other hand, the heat exchange slot 120 provides a heat exchange channel 121 for a single battery module 110 for heat exchange, that is, the heat exchange process of each battery cell 100 is independent. When the heat dissipation or heating of the battery pack fails, the single battery cell 100 can be inspected and repaired, the location of the fault can be accurately obtained, and it can be replaced, which will greatly improve the maintenance efficiency.

[0032] In some embodiments, the heat exchange tank 120 may be a rectangular box with an open top. The inner wall of the heat exchange tank 120 includes the tank wall and the bottom wall of the heat exchange tank 120 , and the interior of the heat exchange tank 120 is a concave cavity.

[0033] In certain embodiments, the heat exchange channels 121 may be located below the housing 111 and / or on opposite sides of the housing 111. When heat exchange channels 121 are provided between the bottom wall and portions of the side walls of the housing 111 of the battery module 110 and the walls of the concave cavity, the contact area between the heat transfer medium and the housing 111 is large, resulting in higher heat exchange efficiency. Consequently, in certain embodiments, the depth of the heat exchange channels 120 can be varied to increase or decrease the portion of the battery module 110 located within the concave cavity, thereby increasing the contact area between the heat transfer medium and the housing 111 and further improving the heat exchange efficiency between the housing 111 and the heat transfer medium.

[0034] Of course, considering the safety of vehicle sideways travel, in certain embodiments, the outer wall of the housing 111 is sealed to a portion of the side wall of the heat exchange tank 120. In this case, the heat exchange channel 121 is located only below the housing 111. The sealed connection between the outer wall of the housing 111 and the portion of the side wall of the heat exchange tank 120 can also ensure the sealing performance of the battery cell 100 by increasing the connection area between the housing 111 and the inner wall of the heat exchange tank 120, thereby preventing the heat transfer medium from leaking out. Sealing connection methods include, but are not limited to, welding or bonding. The housing 111 and heat exchange tank 120 can also be integrated into a single unit through integrated die-casting, ensuring the sealing effect of the housing 111 and heat exchange tank 120 on the heat transfer medium.

[0035] At the same time, it can be understood that compared with the situation where both the bottom wall and the side wall of the shell 111 are in contact with the heat-conducting medium, only the bottom wall of the shell 111 is in contact with the heat exchange medium. Comparing the heat exchange efficiency of the heat exchange medium at the upstream of the heat exchange channel 121 and the heat exchange efficiency at the downstream of the heat exchange channel 121 and the shell 111, the difference in heat exchange efficiency between the two places is smaller, which is beneficial to reducing the temperature difference at both ends of the battery module 110 and improving the safety and service life of the battery unit 100.

[0036] In some embodiments, mounting portions 123 are provided at opposite ends of the heat exchange groove 120, and protrusions 112 corresponding to the mounting portions 123 are provided at opposite ends of the shell 111. The bottom surface of the protrusion 112 and the top surface of the mounting portion 123 can be connected by welding or bonding.

[0037] The mounting portion 123 protrudes compared to the heat exchange groove 120, and the protrusion 112 also protrudes compared to the shell 111. Through the connection between the mounting portion 123 and the protrusion 112 of the shell 111, the mounting portion 123 and the protrusion 112 can provide more mounting area for installing structures such as joints or seals; the connection area between the heat exchange groove 120 and the shell 111 is increased, the connection strength is improved, the sealing of the battery cell 100 is not easily damaged, and the safety of the battery cell 100 during use can be improved. At the same time, the battery module 110 and the heat exchange tank 120 are both long strips, and the heat exchange tank 120 has a concave cavity. It can be understood that the bearing capacity of the middle part of the side wall of the heat exchange tank 120 in the length direction is relatively weak. By adding the mounting portion 123 to support the battery module 110, the pressure of the battery module 110 on the side wall of the heat exchange tank 120 can be reduced, and the possibility of deformation of the heat exchange tank 120 can be reduced, thereby ensuring the sealing of the battery unit 100 and improving the service life of the battery unit 100.

[0038] The mounting portion 123 can be provided on the outer wall of the heat exchange groove 120, or on the inner wall of the heat exchange groove 120. For example, referring to Figure 3, the mounting portion 123 is provided on the outer wall of the heat exchange groove 120 and is located at the opening of the heat exchange groove 120. At this time, the protrusion 112 is provided on the opposite side walls of the shell 111. When the bottom surface of the protrusion 112 is flush with the bottom surface of the shell 111, the bottom wall of the shell 111 will contact the heat-conducting medium in the concave cavity; when the bottom surface of the protrusion 112 is located in the middle of the shell 111, the mounting portion 123 is connected to the protrusion 112, and the bottom wall and part of the side wall of the shell 111 can contact the heat-conducting medium in the concave cavity. At this time, the contact area between the shell 111 and the heat exchange medium is larger, and the heat exchange efficiency is higher.

[0039] Of course, when the mounting portion 123 is disposed on the inner wall of the heat exchange tank 120 , the protrusion 112 is disposed on the outer wall of the housing 111 , and the protrusion 112 can be connected to the top surface of the mounting portion 123 .

[0040] Referring to Figure 3 , in some embodiments, the bottom surface of the protrusion 112 is located in the middle of the outer shell 111, and the longitudinal sidewalls of the outer shell 111 are also connected to the inner wall of the heat exchange tank 120. This increases the connection area between the outer shell 111 and the heat exchange tank 120, improving the sealing of the battery cell 100. This also limits deformation of the longitudinal sidewalls of the heat exchange tank 120, thereby increasing the service life of the battery cell. Of course, in some embodiments, only the longitudinal sidewalls of the outer shell 111 are connected to a portion of the longitudinal sidewalls of the heat exchange tank 120, and a gap is left between the widthwise sidewalls of the outer shell 111 and the widthwise inner wall of the heat exchange tank 120.

[0041] In some embodiments, the first medium through hole 122 is disposed on the mounting portion 123 .

[0042] The mounting portion 123 has a thickness. When the heat exchange tank 120 is produced, the opening of the first medium through hole 122 on the mounting portion 123 is not easily deformed, which can improve the sealing of the heat exchange tank 120. At the same time, the first medium through hole 122 is set on the mounting portion 123, and the mounting portion 123 has more space for setting joints or pipes for the heat-conducting medium to enter the heat exchange channel 121. During maintenance, maintenance personnel and maintenance equipment are not likely to touch or squeeze the side walls of the heat exchange tank 120. The thinner side walls of the heat exchange tank 120 are not easily deformed. The height difference of the cross section of each part of the heat exchange channel 121 is small. When flowing, the heat exchange medium in the heat exchange channel 121 is not easily accelerated or decelerated due to the deformed heat exchange tank 120. The heat exchange efficiency of each part of the shell 111 and the heat exchange medium is similar. The temperature difference between each part of the single battery module 110 is small, which can improve the safety and service life of the battery unit 100. At the same time, the heat exchange groove 120 is not easily deformed and the service life of the heat exchange groove 120 is increased.

[0043] Referring to FIG. 3 , in some embodiments, one opening of the first medium through hole 122 is disposed on the bottom surface of the mounting portion 123 , and the other opening of the first medium through hole 122 is disposed on the inner wall of the heat exchange tank 120 .

[0044] The cross-sectional diameter of the heat exchange channel 121 is greater than the diameter of the first medium through hole 122, that is, the flow velocity of the cooling medium in the first medium through hole 122 before entering the heat exchange channel 121 is higher. When the first medium through hole 122 is a straight hole, the heat-conducting medium entering the heat exchange channel 121 from the first medium through hole 122 will cause scouring of the outer shell 111 of the battery module 110. Therefore, by making the two openings of the first medium through hole 122 oriented in different directions, the first medium through hole 122 is a non-straight hole, thereby increasing the resistance to the flow of the heat-conducting medium, reducing the flow velocity of the heat-conducting medium before entering the heat exchange channel 121, reducing the scouring intensity of the cooling medium on the outer shell 111, reducing the probability of damage to the outer shell 111, and thereby increasing the service life of the battery cell 100. In other embodiments, the anti-scouring ability of the outer shell 111 of the battery module can also be improved by increasing the thickness of the outer shell 111. Of course, only the portion of the outer shell 111 near the first medium through hole 122 can be thickened.

[0045] In some embodiments, the opening height of the first medium through hole 122 is lower than the slot opening of the heat exchange slot 120 .

[0046] When the battery cell 100 is installed in the battery pack, it is placed horizontally. Specifically, please refer to Figures 1 and 2. When the battery cell 100 is installed in the vehicle, the heat exchange tank 120 is set on the chassis of the vehicle, and the battery cell 100 is set above the heat exchange tank 120. It can be understood that at this time, even if a leak occurs at the connection between the shell 111 and the heat exchange tank 120, the heat exchange medium needs to overflow from the notch of the heat exchange tank 120.

[0047] The height of the opening of the first medium through hole 122 is the vertical position of the first medium through hole 122 in Figure 2. The opening of the first medium through hole 122 includes a liquid inlet and a liquid outlet. The height of both openings of the first medium through hole 122 is lower than the notch of the heat exchange tank 120. By utilizing the principle of equal liquid level, even if a battery cell 100 leaks, a large amount of heat exchange medium will not overflow from the notch of the heat exchange tank 120, thereby facilitating safe use of the battery pack.

[0048] In some embodiments, the first medium through holes 122 are disposed at both ends of the heat exchange tank 120 in the length direction.

[0049] In the heat exchange channel 121, the flow rate of the heat-conducting medium at different positions is different. For example, the flow rate of the heat-conducting medium near the axis of the first medium through hole 122 is fast, while the flow rate of the heat-conducting medium at the corners is slow. This will, to a certain extent, cause uneven heat exchange of the battery module 110. Therefore, in order to ensure that the heat-conducting medium can dissipate heat more evenly at all parts of the battery module after flowing into the heat exchange channel 121 from the first medium through hole 122, the outer wall of the heat exchange groove 120 provided with the first medium through hole 122 can be provided with multiple first medium through holes 122. The multiple medium through holes are arranged along the width direction of the heat exchange groove 120 so that the flowing heat-conducting medium can cover more battery modules 110.

[0050] The first medium passage holes 122 are positioned at both ends of the heat exchange tank 120 along its length. While ensuring effective heat exchange, this reduces the number of first medium passage holes 122 provided in the heat exchange tank 120, thereby lowering the probability of heat transfer medium leakage at the joints. Furthermore, this increases the length of the heat exchange channel 121 between the housing 111 and the heat exchange tank 120, thereby increasing the length of the heat exchange channel 121 and the time the heat transfer medium remains within the channel 121, resulting in more uniform heat exchange across the battery module 110.

[0051] The inner wall of the heat exchange groove 120 is provided with guide ribs, and the guide ribs are arranged along the length direction of the shell 111.

[0052] The inner wall of the heat exchange groove 120 may be provided with a plurality of guide ribs, which protrude compared to the inner wall of the heat exchange groove 120. The guide ribs have a guiding function for the heat-conducting medium in the heat exchange channel 121, so as to reduce the turbulent state of the heat-conducting medium in the heat exchange channel 121, and further ensure a more uniform heat exchange effect between the heat-conducting medium in the heat exchange channel 121 and the outer shell 111 of the battery module 110.

[0053] Based on the same inventive concept, please refer to Figures 4-6, the second embodiment of the present application provides a battery pack, including at least the battery cell 100 as in the first embodiment of the present application.

[0054] When the battery pack includes multiple battery cells 100, each battery cell 100 is connected in series to power the vehicle. Of course, when the battery cells 100 can provide sufficient voltage for the vehicle, some battery cells 100 can also be connected in parallel. Regardless of whether the battery cells 100 are connected in series or in parallel, the heat exchange structure of each battery cell 100 is relatively independent. The heat exchange medium that enters the heat exchange channel 121 of one battery cell 100 will not re-enter the heat exchange channel 121 of other battery cells 100 after being discharged. When a heat dissipation or heating failure occurs in the battery pack, individual battery cells 100 can be inspected and repaired, accurately located, and replaced, significantly improving inspection efficiency. Furthermore, the heat transfer medium directly contacts the bottom surface of the battery module 110, improving the thermal conductivity between the outer shell 111 and the heat transfer medium, and making the overall temperature variation of the individual battery modules 110 more balanced.

[0055] Moreover, the heat exchange channels 121 between each battery cell 100 are independent of each other, that is, each battery cell 100 can obtain a similar heating or heat dissipation effect, and the temperature change of the entire battery pack is also relatively balanced, which is beneficial to improving the service life of the battery pack and also beneficial to maintaining good performance of the battery pack.

[0056] In some embodiments, the battery pack further includes a frame structure 200 , an upper cover (not shown in the drawings) and a circuit assembly (not shown in the drawings). The frame structure 200 includes two oppositely disposed side beams 210 and a cross beam 220 connecting the two side beams 210 .

[0057] A mounting hole 212 for connecting to a vehicle is provided on one side of the side beam 210 . The mounting hole 212 is used to connect to the vehicle so as to install the battery pack on the vehicle.

[0058] The frame structure 200 includes at least two crossbeams 220, and at least one crossbeam 220 is provided with a control cabin 221 for installing circuit components. The upper cover is connected to the frame structure 200 and covers the opening above the frame structure 200 to protect the battery cells 100, circuit components and other components of the battery pack. Specifically, the top surfaces of the side beams 210 and the crossbeams 220 are provided with a plurality of mounting holes, which are used to cooperate with bolts and other connecting parts so that the upper cover can be fixedly set on the frame structure 200. A collecting groove 211 is provided on the other side of the side beam 210, and the opposite ends of the battery cell 100 are respectively connected to a side beam 210, and the first medium through hole 122 is connected to the corresponding collecting groove 211.

[0059] Please refer to Figures 4 and 5. A connecting plate 213 is provided on one side of the side beam 210, and the mounting hole 212 is provided on the connecting plate 213. The connecting plate 213 can be set on the side wall of the side beam 210 by welding or screwing. Of course, the connecting plate 213 and the side beam 210 can also be integrally formed and supported by casting.

[0060] Of the collecting grooves 211 of the two side beams 210, one collecting groove 211 is used to input the heat-conducting medium into one end of the battery cell 100, and the other collecting groove 211 is used to collect the heat-conducting medium flowing out from the other end of the battery cell 100. The collecting grooves 211 of the two side beams 210 are both connected to the cooling system and heating system of the vehicle, so that the heat-conducting medium entering the battery cell 100 can selectively enter the cooling system or heating system for heating or cooling, so as to achieve heating or heat dissipation of the battery module 110.

[0061] The collecting trough 211 is provided on one side of the side beam 210. In some embodiments, the collecting trough 211 may be provided at the lower end of the side of the side beam 210, and the top surface of the collecting trough 211 is provided at the bottom end of the battery cell 100. The frame structure 200 is mounted on the vehicle through the mounting holes 212. Please refer to Figures 4 to 6. The outer shell 111 of the battery cell 100 may be provided on the collecting trough 211 by screwing or welding, and the frame structure 200 provides support for at least one battery cell 100. At the same time, because the battery cell 100 is provided above the collecting trough 211, it is easy to disassemble and assemble, and the step of removing the battery module 110 in order to inspect or replace the liquid cooling plate during the battery pack inspection in the prior art can be omitted.

[0062] In some embodiments, the manifold 211 is provided with a second medium through hole corresponding to the first medium through hole 122 , and a sealing member 300 is provided between the first medium through hole 122 and the second medium through hole.

[0063] During battery pack maintenance, the battery cells 100 need to be disassembled and assembled. Therefore, a seal 300 is provided to seal the first dielectric through-hole 122 and the second dielectric through-hole, thereby enhancing the seal between the battery cell 100 and the manifold 211. Referring to Figure 6 , the seal 300 is annular and is positioned around the opening of the first dielectric through-hole 122.

[0064] Of course, in some embodiments, the frame structure 200 may further include a center beam, which is disposed parallel to and between the two side beams 210. The center beam has two opposite side walls each provided with a collecting groove 211. The battery cells 100 are disposed between the center beam and the side beams 210. The collecting grooves 211 of the two side beams 210 are used to inject heat exchange medium into the battery cells 100, while the collecting groove 211 of the center beam is used to collect the heat exchange medium flowing out of the battery cells 100. It is understood that in this case, the length of a single battery cell 100 is shortened, the cost of a single battery cell 100 is lower, and the cost of replacing the battery cells 100 can be reduced.

[0065] In certain embodiments, a temperature sensor is located at the same position on each battery cell 100 to obtain temperature information for each battery cell. This temperature information can be the temperature of the heat exchange medium within the heat exchange channel 121 or the temperature of the battery cells in the battery module 110. The temperature sensor is electrically connected to the vehicle's ECU (Electronic Control Unit). By comparing the temperature data of multiple battery cells 100, the ECU can determine whether any of the multiple battery cells 100 are experiencing abnormal heat dissipation or abnormal temperature rise. This significantly improves driving safety, and accurately identifies the location of heat exchange anomalies, facilitating maintenance or replacement by operators and increasing maintenance efficiency.

[0066] In this application, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0067] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise" and "counterclockwise" indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0068] In this application, unless otherwise specified or limited, the terms "connect," "fix," etc. should be understood broadly. For example, "fix" can mean fixed connection, detachable connection, or integration; it can mean mechanical connection or electrical connection; it can mean direct connection or indirect connection through an intermediate medium; it can mean internal communication between two elements or interaction between two elements. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0069] In addition, the terms "first," "second," and so on, used in this application are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, features specified as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "plurality" means two or more, unless otherwise specifically defined.

[0070] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and intent of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A battery cell, characterized in that: include: A battery module having a housing; A heat exchange tank, wherein the lower end of the battery module is disposed in the heat exchange tank, and a gap is provided between the outer shell and the tank wall and / or bottom wall of the heat exchange tank; the outer shell is sealedly connected to the tank wall of the heat exchange tank to form a heat exchange channel between the outer shell and the heat exchange tank, and first medium through holes are provided at opposite ends of the heat exchange tank, and a heat-conducting medium flows into the heat exchange channel through the first medium through hole at one end of the heat exchange tank and then flows out of the heat exchange channel through the first medium through hole at the other end of the heat exchange tank.

2. The battery cell according to claim 1, wherein: Mounting parts are provided at opposite ends of the heat exchange tank, and protrusions corresponding to the mounting parts are provided at opposite ends of the shell, and the bottom surfaces of the protrusions are connected to the top surfaces of the mounting parts.

3. The battery cell according to claim 2, wherein: The first medium through hole is provided on the mounting portion.

4. The battery cell according to claim 3, characterized in that One opening of the first medium through hole is provided on the bottom surface of the mounting portion, and the other opening of the first medium through hole is provided on the inner wall of the heat exchange groove.

5. The battery cell according to claim 3, wherein: The opening height of the first medium through hole is lower than the slot opening of the heat exchange slot.

6. The battery cell according to any one of claims 1 to 5, characterized in that: The first medium through holes are arranged at both ends of the heat exchange groove in the length direction; the inner wall of the heat exchange groove is provided with guide ribs, and the guide ribs are arranged along the length direction of the shell.

7. The battery cell according to any one of claims 1 to 5, characterized in that: The outer wall of the shell is welded to the cavity wall of the heat exchange groove, so that the heat exchange channel is communicated with the first medium through hole only.

8. A battery pack, characterized in that: The device comprises at least one battery cell according to any one of claims 1 to 7.

9. The battery pack according to claim 8, characterized in that: The battery pack also includes a frame structure, an upper cover and a circuit assembly. The frame structure includes two oppositely arranged side beams and a cross beam connected to the side beams. One side of the side beam is provided with a mounting hole for connecting to a vehicle, and the other side of the side beam is provided with a collecting groove. The opposite ends of the battery unit are respectively connected to one of the side beams, and the first medium through hole is connected to the corresponding collecting groove.

10. The battery pack according to claim 9, characterized in that: The collecting tank is provided with a second medium through hole corresponding to the first medium through hole, and a sealing member is provided between the first medium through hole and the second medium through hole.

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