A battery pack

Abstract

This application discloses a battery pack that solves the technical problem of uneven heat dissipation in existing battery packs. The battery unit includes a battery module with a housing and a heat exchange tank. The lower end of the battery module is disposed within the heat exchange tank, and a gap is provided between the housing and the tank wall and / or bottom wall of the heat exchange tank. The housing and the tank wall are sealed together to form a heat exchange channel. Each end of the heat exchange tank has a first medium through-hole, through which the heat-conducting medium flows into the heat exchange channel and out through the first medium through-hole at the other end of the heat exchange tank. The battery pack includes at least one battery unit. The battery module of this application exhibits more uniform overall temperature variation, and the unitized design of the battery module and heat exchange tank facilitates maintenance.

Description

Technical Field

[0001] This application belongs to the field of vehicle battery pack technology, and specifically relates to a battery pack. Background Technology

[0002] The internal cooling system of a battery pack typically consists of a liquid cooling plate and a thermal pad. A water pump drives the coolant to flow inside the liquid cooling plate, thereby removing 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 surrounding liquid collection pipes. That is, the liquid cooling plate is set as a whole under the battery pack. The diameter of the harmonica tube in the liquid cooling plate is small, and the flow velocity in the harmonica tube is fast. This makes it impossible for some battery packs near 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] To address the technical problem of uneven heat dissipation in current battery packs, this application provides a battery pack.

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

[0006] Battery module, with a casing;

[0007] A heat exchange tank is provided, with the lower end of the battery module disposed within the heat exchange tank. 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 sealed to the tank wall of the heat exchange tank to form a heat exchange channel between the outer shell and the heat exchange tank. A first medium through hole is provided at each of the opposite ends of the heat exchange tank. The 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, the heat exchange tank is provided with mounting portions at both ends, and the outer shell is provided with protrusions corresponding to the mounting portions at both ends, with the bottom surface of the protrusions connected to the top surface 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 located on the bottom surface of the mounting portion, and the other opening of the first medium through hole is located on the inner wall of the heat exchange tank.

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

[0012] In some embodiments, the first medium through holes are located at both ends of the heat exchange tank along its length; the inner wall of the heat exchange tank is provided with guide ribs, which are arranged along the length of the outer shell.

[0013] In some embodiments, the outer wall of the housing is welded to the cavity wall of the heat exchange tank so that the heat exchange channel communicates only with the first medium through hole.

[0014] In a second aspect of this application, a battery pack is provided, including at least one of the battery cells.

[0015] In some embodiments, the battery pack further includes a frame structure, a top cover, and circuit components. The frame structure includes two opposing side beams and a crossbeam connected to the side beams. One side of each side beam has a mounting hole for connecting to a vehicle, and the other side of each side beam has a current collection groove. The opposite ends of each battery cell are connected to one of the side beams, and the first medium through hole communicates with the corresponding current collection groove.

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

[0017] According to one or more embodiments of this application, the battery cell is sealed to the wall of a heat exchange tank through a housing, forming a heat exchange channel between the housing and the heat exchange tank. The lower end of the battery module's housing is located within the cavity of the heat exchange tank, meaning that when the heat transfer medium flows through the heat exchange channel, it directly contacts the battery module, allowing heat exchange between the heat transfer medium and the padding module through the housing. Furthermore, 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 housing and the inner wall of the cavity is also larger, allowing for greater heat transfer of the heat transfer medium within the heat exchange channel. The flow rate will slow down, allowing sufficient time for the heat transfer medium downstream of the heat exchange channel to exchange heat with the outer casing, resulting in a more balanced overall temperature change in the battery module. Simultaneously, the heat transfer medium directly contacts the bottom surface of the battery module, improving the thermal conductivity between the outer casing and the heat transfer medium. Furthermore, the heat exchange tank provides a heat exchange channel for each individual battery module, meaning that the heat exchange of each battery cell is independent. When a fault occurs in the heat dissipation or heating of the battery pack, individual battery cells can be inspected, accurately pinpointing the location of the fault and allowing for replacement, significantly improving maintenance efficiency. Attached Figure Description

[0018] Figure 1 A schematic diagram of the structure of a battery cell in one or more embodiments of this application is shown.

[0019] Figure 2 It shows Figure 1A cross-sectional view of the battery cell.

[0020] Figure 3 It shows Figure 2 Enlarged diagram of point A in the diagram.

[0021] Figure 4 A schematic diagram of the battery pack structure in one or more embodiments of this application is shown.

[0022] Figure 5 It shows Figure 4 A structural schematic diagram of the battery pack from another perspective.

[0023] Figure 6 It shows Figure 4 A schematic diagram showing the connection between the middle battery cell and the side beam.

[0024] Explanation of reference numerals in the attached drawings: 100-battery unit, 110-battery module, 111-outer shell, 112-protrusion, 120-heat exchange tank, 121-heat exchange channel, 122-first medium through hole, 123-mounting part, 200-frame structure, 210-side beam, 211-collector trough, 212-mounting hole, 213-connecting plate, 220-crossbeam, 221-control compartment, 300-sealant. Detailed Implementation

[0025] To enable those skilled in the art to more clearly understand this application, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0026] Figure 1 A schematic diagram of the structure of a battery cell in one or more embodiments of this application is shown. Figure 2 It shows Figure 1 A cross-sectional view of the battery cell. Figure 3 It shows Figure 2 Enlarged diagram of point A in the diagram. Figure 4 A schematic diagram of the battery pack structure in one or more embodiments of this application is shown. Figure 5 It shows Figure 4 A structural schematic diagram of the battery pack from another perspective. Figure 6 It shows Figure 4 A schematic diagram showing the connection between the middle battery cell and the side beam.

[0027] Please see Figure 1-3According to a first aspect of this application, a battery cell is provided, including a battery module 110 and a heat exchange tank 120. The battery module 110 has a housing 111, and a battery cell is disposed inside the housing 111, wherein the battery cell is a device capable of storing electrical energy.

[0028] The heat exchange tank 120 has a cavity for accommodating the heat transfer medium. The lower end of the battery module 110 is located within the cavity of the heat exchange tank 120. The outer shell 111 is sealed to the tank wall of the heat exchange tank 120 to form a heat exchange channel 121 for the flow of the heat transfer medium between the outer shell 111 and the heat exchange tank 120. Each end of the heat exchange tank 120 has a first medium through hole 122. The heat transfer 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 flows out of 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 cavity of the heat exchange tank 120. That is, when the heat transfer medium flows in the heat exchange channel 121, the heat transfer medium directly contacts the battery module 110, and the heat transfer 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, resulting in high thermal conductivity between the outer shell 111 and the heat-conducting medium. Furthermore, 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. The flow rate of the heat-conducting medium in the heat exchange channel 121 will be slower, and even the heat-conducting medium downstream of the heat exchange channel 121 will have enough time to exchange heat with the outer shell 111, making the overall temperature change of the battery module 110 more balanced, and the temperature difference between the two ends of the battery module 110 smaller. This results in high safety and long service life for the battery unit 100.

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

[0033] In some embodiments, the heat exchange channel 121 may be located below the outer casing 111 and / or on opposite sides of the outer casing 111. When the bottom wall and part of the side wall of the outer casing 111 of the battery module 110 have heat exchange channels 121 between them and the cavity wall of the recess, the contact area between the heat-conducting medium and the outer casing 111 is large, and the heat exchange efficiency is higher. Therefore, in some embodiments, by changing the depth of the heat exchange groove 120, the portion of the battery module 110 located within the recess can be increased or decreased, thereby increasing the contact area between the heat-conducting medium and the outer casing 111 and further improving the heat exchange efficiency between the outer casing 111 and the heat-conducting medium.

[0034] Of course, considering vehicle side-driving safety, in some 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 only located below the housing 111. The sealed connection between the outer wall of the housing 111 and a portion of the side wall of the heat exchange tank 120 also increases the connection area between the inner walls of the housing 111 and the heat exchange tank 120, ensuring the sealing performance of the battery cell 100 and preventing leakage of the heat transfer medium. Sealing methods include, but are not limited to, welding or bonding. Alternatively, the housing 111 and the heat exchange tank 120 can be integrally die-cast to ensure the sealing effect of the housing 111 and the heat exchange tank 120 on the heat transfer medium.

[0035] Meanwhile, it is understandable that, compared to the case where both the bottom and side walls of the outer casing 111 are in contact with the heat-conducting medium, only the bottom wall of the outer casing 111 is in contact with the heat exchange medium. Comparing the heat exchange efficiency of the heat exchange medium with the outer casing 111 at the upstream end of the heat exchange channel 121 and the heat exchange efficiency of the heat exchange medium with the outer casing 111 at the downstream end of the heat exchange channel 121, the difference in heat exchange efficiency between the two locations is smaller. This helps to reduce the temperature difference between the two ends of the battery module 110, and can improve the safety and service life of the battery unit 100.

[0036] In some embodiments, the heat exchange tank 120 is provided with mounting portions 123 at both ends, and the outer shell 111 is provided with protrusions 112 corresponding to the mounting portions 123 at both ends. The bottom surface of the protrusions 112 and the top surface of the mounting portions 123 can be connected by welding or bonding.

[0037] The mounting portion 123 protrudes from the heat exchange tank 120, and the protrusion 112 protrudes from the outer casing 111. Through the connection between the mounting portion 123 and the protrusion 112 of the outer casing 111, both the mounting portion 123 and the protrusion 112 can provide more mounting area for mounting joints or seals and other structures. This increases the connection area between the heat exchange tank 120 and the outer casing 111, improves the connection strength, and makes the sealing of the battery unit 100 less susceptible to damage, thereby improving the safety of the battery unit 100 during use. Meanwhile, both the battery module 110 and the heat exchange tank 120 are elongated, and the heat exchange tank 120 has a cavity. Therefore, it is understandable that the load-bearing capacity of the middle part of the side wall along the length of the heat exchange tank 120 is relatively weak. By adding the mounting part 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, 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 part 123 can be located on the outer wall of the heat exchange tank 120 or on the inner wall of the heat exchange tank 120. For example, please refer to... Figure 1 The mounting part 123 is disposed on the outer wall of the heat exchange tank 120 and located at the opening of the heat exchange tank 120. At this time, the protrusion 112 is disposed on the opposite side walls of the outer shell 111. When the bottom surface of the protrusion 112 is flush with the bottom surface of the outer shell 111, the bottom wall of the outer shell 111 will contact the heat-conducting medium in the cavity. When the bottom surface of the protrusion 112 is located in the middle of the outer shell 111, the mounting part 123 is connected to the protrusion 112, and the bottom wall and part of the side wall of the outer shell 111 can contact the heat-conducting medium in the cavity. At this time, the contact area between the outer shell 111 and the heat exchange medium is larger, and the heat exchange efficiency is higher.

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

[0040] Please see Figure 3 In some embodiments, the bottom surface of the protrusion 112 is located in the middle of the outer casing 111, and the sidewalls along the length of the outer casing 111 are also connected to the inner wall of the heat exchange groove 120. This increases the connection area between the outer casing 111 and the heat exchange groove 120, improves the sealing performance of the battery unit 100, and also limits the deformation of the sidewalls along the length of the heat exchange groove 120, thereby increasing the service life of the battery unit. Of course, in some embodiments, only the sidewalls along the length of the outer casing 111 are connected to a portion of the sidewalls along the length of the heat exchange groove 120, and there is a gap between the sidewalls along the width of the outer casing 111 and the inner wall along the width of the heat exchange groove 120.

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

[0042] The mounting portion 123 has thickness, and when producing the heat exchange tank 120, the opening of the first medium through hole 122 on the mounting portion 123 is less prone to deformation, which can improve the sealing performance of the heat exchange tank 120. At the same time, by setting the first medium through hole 122 on the mounting portion 123, the mounting portion 123 has more space for setting joints or pipes for the heat transfer medium to enter the heat exchange channel 121. During maintenance, maintenance personnel and maintenance equipment are less likely to touch or squeeze the side wall of the heat exchange tank 120. The side wall of the thinner heat exchange tank 120 is less prone to deformation. The height difference of the cross section at various points of the heat exchange channel 121 is small. When the heat exchange medium in the heat exchange channel 121 flows, it is less likely to suddenly accelerate or decelerate due to the deformation of the heat exchange tank 120. The heat exchange efficiency between the outer shell 111 and the heat exchange medium is similar at various points. The temperature difference between various points of the individual battery module 110 is small, which can improve the safety and service life of the battery unit 100. At the same time, the fact that the heat exchange tank 120 is not easily deformed can also improve the service life of the heat exchange tank 120.

[0043] Please see Figure 3 In some embodiments, one opening of the first medium through hole 122 is located on the bottom surface of the mounting portion 123, and the other opening of the first medium through hole 122 is located on the inner wall of the heat exchange tank 120.

[0044] The cross-sectional area of ​​the heat exchange channel 121 is larger than the diameter of the first medium through-hole 122, meaning that the flow velocity of the cooling medium in the first medium through-hole 122 before entering the heat exchange channel 121 is relatively high. 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 erosion of the outer casing 111 of the battery module 110. Therefore, by making the two openings of the first medium through-hole 122 face different directions, the first medium through-hole 122 is made into 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 erosion intensity of the cooling medium on the outer casing 111, reducing the probability of damage to the outer casing 111, and thus improving the service life of the battery cell 100. In other embodiments, the erosion resistance of the outer casing 111 can also be improved by increasing the thickness of the outer casing 111 of the battery module. Of course, it is also possible to only thicken the portion of the outer casing 111 near the first medium through-hole 122.

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

[0046] When the battery unit 100 is installed inside the battery pack, it is placed horizontally. For details, please refer to [reference needed]. Figure 1 and Figure 2When the battery unit 100 is installed in the vehicle, the heat exchange groove 120 is located on the chassis of the vehicle, and the battery unit 100 is located above the heat exchange groove 120. Understandably, even if a leak occurs at the connection between the outer casing 111 and the heat exchange groove 120, the heat exchange medium still needs to overflow from the opening of the heat exchange groove 120.

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

[0048] In some embodiments, the first medium through hole 122 is provided at both ends of the heat exchange tank 120 along its length.

[0049] In the heat exchange channel 121, the flow rate of the heat-conducting medium varies at different locations. 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 cause uneven heat exchange in the battery module 110 to a certain extent. Therefore, in order to ensure that the heat-conducting medium can dissipate heat evenly to 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 tank 120 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 tank 120 so that the flowing heat-conducting medium can cover more of the battery module 110.

[0050] By placing the first medium through holes 122 at both ends of the heat exchange tank 120 along its length, on the one hand, the number of first medium through holes 122 opened in the heat exchange tank 120 is reduced while ensuring heat exchange effect, thus reducing the probability of heat transfer medium leakage at the joint. On the other hand, increasing the length of the heat exchange channel 121 between the outer shell 111 and the heat exchange tank 120 increases the residence time of the heat transfer medium in the heat exchange channel 121, making the heat exchange more uniform throughout the battery module 110.

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

[0052] The inner wall of the heat exchange tank 120 may be provided with multiple guide ribs. The guide ribs protrude from the inner wall of the heat exchange tank 120. The guide ribs guide the heat transfer medium in the heat exchange channel 121 to reduce the turbulence of the heat transfer medium in the heat exchange channel 121, and further ensure that the heat transfer medium in the heat exchange channel 121 and the outer shell 111 of the battery module 110 have a more uniform heat exchange effect.

[0053] Based on the same inventive concept, please refer to Figure 4-6 According to a second aspect of this application, a battery pack is provided, including at least the battery cell 100 as described in the first aspect of this 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 entering the heat exchange channel 121 of one battery cell 100 will not re-enter the heat exchange channel 121 of another battery cell 100 after being discharged. When the heat dissipation or heating of the battery pack fails, the individual battery cell 100 can be inspected, the fault location can be accurately located, and repair or replacement can be performed, which will greatly improve the inspection efficiency. At the same time, the heat transfer medium is in direct contact with the bottom surface of the battery module 110, which will improve the heat transfer efficiency between the outer shell 111 and the heat transfer medium, and the overall temperature change of the individual battery module 110 will be more uniform.

[0055] Furthermore, the heat exchange channels 121 between each battery cell 100 are independent of each other, meaning that each battery cell 100 can achieve similar heating or cooling effects, and the temperature change of the entire battery pack is relatively balanced, which is beneficial to improving the service life of the battery pack and also helps the battery pack maintain good performance.

[0056] In some embodiments, the battery pack also includes a frame structure 200, a top cover (not shown in the drawings), and circuitry (not shown in the drawings). The frame structure 200 includes two opposing side beams 210 and a crossbeam 220 connecting the two side beams 210.

[0057] One side of the side beam 210 is provided with a mounting hole 212 for connecting to a vehicle, the mounting hole 212 is used to connect to the vehicle so that the battery pack can be installed on the vehicle.

[0058] The frame structure 200 includes at least two crossbeams 220, with a control compartment 221 mounted on at least one crossbeam 220 for mounting circuit components. A top cover connects to the frame structure 200 and covers the opening above it 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 crossbeams 220 are provided with multiple mounting holes for use with bolts or other fasteners to secure the top cover to the frame structure 200. A current collection groove 211 is provided on the other side of the side beam 210. The opposite ends of the battery cells 100 are each connected to one side beam 210, and a first dielectric through-hole 122 communicates with the corresponding current collection groove 211.

[0059] Please see Figure 4 and Figure 5 A connecting plate 213 is provided on one side of the side beam 210, and a mounting hole 212 is provided on the connecting plate 213. The connecting plate 213 can be installed on the side wall of the side beam 210 by welding or screwing, or it can be cast to form the connecting plate 213 and the side beam 210 as a single unit for support.

[0060] In the two side beams 210, one of the collecting channels 211 is used to input the heat transfer medium into one end of the battery cell 100, and the other collecting channel 211 is used to collect the heat transfer medium flowing out from the other end of the battery cell 100. The collecting channels 211 of the two side beams 210 are connected to the vehicle's cooling system and heating system, so that the heat transfer medium entering the battery cell 100 can be selectively entered into the cooling system or the heating system for heating or cooling, so as to heat or dissipate heat from the battery module 110.

[0061] A current collector 211 is disposed on one side of the side beam 210. In some embodiments, the current collector 211 may be disposed at the lower end of the side of the side beam 210, and the top surface of the current collector 211 is disposed at the bottom end of the battery unit 100. The frame structure 200 is mounted on the vehicle through the mounting hole 212. Please refer to [link / reference]. Figures 4-6 The outer casing 111 of the battery unit 100 can be mounted on the current collector 211 by screwing or welding, and the frame structure 200 provides support for at least one battery unit 100. At the same time, since the battery unit 100 is mounted above the current collector 211, it is easy to disassemble and assemble, which eliminates the step in the prior art of removing the battery module 110 for maintenance or replacement of the liquid cooling plate during battery pack maintenance.

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

[0063] When servicing the battery pack, it is necessary to disassemble and reassemble the battery unit 100. Therefore, a sealing element 300 is used to create a sealed connection between the first medium through-hole 122 and the second medium through-hole, thereby enhancing the sealing performance between the battery unit 100 and the current collector 211. Please refer to [link / reference]. Figure 6 The sealing element 300 is in the shape of a ring and is disposed around the opening of the first medium passage 122.

[0064] Of course, in some embodiments, the frame structure 200 may also include a middle beam, which is arranged parallel to the two side beams 210. Each of the opposite side walls of the middle beam is provided with a heat exchange groove 211. The battery unit 100 is disposed between the middle beam and the side beams 210. The heat exchange grooves 211 of the two side beams 210 are used to inject heat exchange medium into the battery unit 100, and the heat exchange grooves 211 of the middle beam are used to collect the heat exchange medium flowing out of the battery unit 100. It is understandable that in this case, the length of a single battery unit 100 is shorter, the cost of a single battery unit 100 is lower, and the cost of replacing the battery unit 100 can be reduced.

[0065] In some embodiments, a temperature sensor is installed at the same location in each battery cell 100 to obtain temperature information for each battery cell. The temperature information can be the temperature of the heat exchange medium in 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 there are any battery cells 100 with abnormal heat dissipation or temperature rise. This will significantly improve safety during driving, accurately pinpoint the location of heat exchange abnormalities, facilitate maintenance or replacement by operators, and improve maintenance efficiency.

[0066] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0067] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", and "counterclockwise" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0068] In this application, unless otherwise expressly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0069] Furthermore, the use of terms such as "first" and "second" in this application is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

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

Claims

1. A battery pack, characterized in that, It includes a frame structure and at least one battery cell, the battery cell comprising: A battery module has a housing, with protrusions at both opposite ends of the housing; A heat exchange tank is provided at both ends of the heat exchange tank, with mounting portions corresponding to the protrusions. The bottom surface of the protrusions is connected to the top surface of the mounting portions. The lower end of the battery module is located inside the heat exchange tank. 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 sealed to the tank wall of the heat exchange tank to form a heat exchange channel between the outer shell and the heat exchange tank. The inner wall of the heat exchange tank is provided with guide ribs, which are arranged along the length direction of the outer shell. Each end of the heat exchange tank is provided with a first medium through hole. The first medium through hole is located at both ends of the length direction of the heat exchange tank. One opening of the first medium through hole is located on the bottom surface of the mounting portion, and the other opening of the first medium through hole is located on the inner wall of the heat exchange tank. The opening height of the first medium through hole is lower than the opening of the heat exchange tank. The heat transfer 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. The frame structure includes two oppositely arranged side beams and a crossbeam connected to the side beams. A current collection groove is provided on one side of each side beam. The opposite ends of each battery unit are respectively connected to one of the side beams. The first medium through hole communicates with the corresponding current collection groove.

2. The battery pack according to claim 1, characterized in that, The outer wall of the outer shell is welded to the cavity wall of the heat exchange tank so that the heat exchange channel communicates only with the first medium through hole.

3. The battery pack according to claim 1, characterized in that, The battery pack also includes a top cover and circuit components, and the other side of the side beam is provided with a mounting hole for connecting to a vehicle.

4. The battery pack according to claim 3, characterized in that, The collecting groove is provided with a second medium through hole corresponding to the first medium through hole, and a sealing element is provided between the first medium through hole and the second medium through hole.

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